Wave response analyses of floating crane structure; Crane sen no jobu kozobutsu no haro oto

Energy Technology Data Exchange (ETDEWEB)

Nobukawa, H.; Takaki, M.; Kitamura, M.; Ahou, G. [Hiroshima University, Hiroshima (Japan). Faculty of Engineering; Higashimura, M. [Fukada Salvage and Marine Works Co. Ltd., Osaka (Japan)

1996-12-31

Identifying a dynamic load acting on a lifted load in a floating crane moving in waves is important for preparing an operation manual for the floating crane. Analyses were made on motions in waves of a floating crane with a lifting load of 3,600 tons, with considerations given to deformation of the crane structure. Discussions were given on a dynamic load acting on a lifted load. If a case that considers elastic deformation in the crane structure is compared with a case that does not consider same in calculating hull motions of the floating crane, the difference between them is small if wave length {lambda} to the ship length L is about 0.5. However, if {lambda}/L is 1.0 and 1.5, the difference grows very large. Therefore, the effect of deformation in the crane structure on hull motions of the floating crane cannot be ignored in these cases. A dynamic load acting on a lifted load that considers deformation in the crane structure is about 5% of lifted weight in a headsea condition in which the wave height is 2 m and {lambda}/L is 1.5. As opposed, an estimated value of a dynamic load when the crane structure is regarded as a rigid body is 13%, which is 2.6 times as great as the case that considers deformation of the crane structure. 3 refs., 17 figs., 1 tab.

Wave response analyses of floating crane structure; Crane sen no jobu kozobutsu no haro oto

Energy Technology Data Exchange (ETDEWEB)

Nobukawa, H; Takaki, M; Kitamura, M; Ahou, G [Hiroshima University, Hiroshima (Japan). Faculty of Engineering; Higashimura, M [Fukada Salvage and Marine Works Co. Ltd., Osaka (Japan)

1997-12-31

Identifying a dynamic load acting on a lifted load in a floating crane moving in waves is important for preparing an operation manual for the floating crane. Analyses were made on motions in waves of a floating crane with a lifting load of 3,600 tons, with considerations given to deformation of the crane structure. Discussions were given on a dynamic load acting on a lifted load. If a case that considers elastic deformation in the crane structure is compared with a case that does not consider same in calculating hull motions of the floating crane, the difference between them is small if wave length {lambda} to the ship length L is about 0.5. However, if {lambda}/L is 1.0 and 1.5, the difference grows very large. Therefore, the effect of deformation in the crane structure on hull motions of the floating crane cannot be ignored in these cases. A dynamic load acting on a lifted load that considers deformation in the crane structure is about 5% of lifted weight in a headsea condition in which the wave height is 2 m and {lambda}/L is 1.5. As opposed, an estimated value of a dynamic load when the crane structure is regarded as a rigid body is 13%, which is 2.6 times as great as the case that considers deformation of the crane structure. 3 refs., 17 figs., 1 tab.

Systematic analysis on mooring systems of floating structures; Futai keiryuho ni kansuru keitoteki kenkyu

Energy Technology Data Exchange (ETDEWEB)

Yoshida, K; Suzuki, H; Ide, T [The University of Tokyo, Tokyo (Japan)

1997-12-31

Discussed herein are mooring performance requirements of the new types of marine structures now proposed, and characteristic ranges and future expansion potential of the existing mooring systems. The mooring systems studied for floating structures are catenary, single point (multi-leg and single-leg types), fixed structure with fender and tension leg mooring systems. The studied items include extraction of the elements that constitute rigidity of the spring for horizontal mooring, survey on and data collection for each element, determination of element ranges, programs for mooring analysis, assessment of mooring characteristic ranges, and potential development of the characteristic ranges. It is concluded that the existing systems with their current characteristic ranges and future possibility are insufficient for the future marine structures. It is therefore necessary to develop new mooring concepts, instead of expanding the current concepts, in order to meet the mooring performance requirements for the new marine structures. 14 refs., 9 figs., 11 tabs.

Systematic analysis on mooring systems of floating structures; Futai keiryuho ni kansuru keitoteki kenkyu

Energy Technology Data Exchange (ETDEWEB)

Yoshida, K.; Suzuki, H.; Ide, T. [The University of Tokyo, Tokyo (Japan)

1996-12-31

Discussed herein are mooring performance requirements of the new types of marine structures now proposed, and characteristic ranges and future expansion potential of the existing mooring systems. The mooring systems studied for floating structures are catenary, single point (multi-leg and single-leg types), fixed structure with fender and tension leg mooring systems. The studied items include extraction of the elements that constitute rigidity of the spring for horizontal mooring, survey on and data collection for each element, determination of element ranges, programs for mooring analysis, assessment of mooring characteristic ranges, and potential development of the characteristic ranges. It is concluded that the existing systems with their current characteristic ranges and future possibility are insufficient for the future marine structures. It is therefore necessary to develop new mooring concepts, instead of expanding the current concepts, in order to meet the mooring performance requirements for the new marine structures. 14 refs., 9 figs., 11 tabs.

On the method for fracture strength assessment. Part 2; Kozobutsu no hakai kyodo hyoka no jissai. 2

Energy Technology Data Exchange (ETDEWEB)

Onozuka, M. [Ishikawajima-Harima Heavy Industries Co. Ltd., Tokyo (Japan)

1995-09-05

In order to reduce the economic cost of the generating set etc. the damages to the materials and structures of the structure to last the original design life were observed and it was considered that if damages were fewer the life would be longer. One of the important items in assessing, amending and renewing the rationality of the established structure is the assessment of the defects and flaws existing in the welded joints. In Japan, WES 2805 which is named as the Method for Assessing the Defects for the Brittle Fracture Occurring Properties of Welded Joint was formulated in 1980 as the standard of the Japan Welding Society. Although it has been applied as the criterion in wide range, the part on brittle fracture is now under revision to reflect the research results on fracture mechanics thereafter and to perfect the fracture relationship because many years have passed since its first formulation. In this paper, the contents in the final stage of the revision of WES 2805 standard, including concrete examples, were introduced. 2 refs., 6 figs., 2 tabs.

Earthquake resistant measures of existing structures by TRTA; Eidan chikatetsu ni okeru kisetsu doboku kozobutsu no taishin taisaku

Energy Technology Data Exchange (ETDEWEB)

Miyata, N.

1997-08-10

Seismic countermeasures for the existing structures are introduced on the main item: reinforcement of open-cut tunnel RC center pillars as well as on reinforcement of rigid frame viaduct pillars and installation of a device for prevention of viaduct falling. First, for reinforcing open-cut tunnel center pillars, design was devised so as to be suitable to construction environment in the subway yard. Important reinforcement materials are steel and filling materials; SS and a self-leveling material for building construction were chosen. The following construction work procedures are explained based on the actual construction: removal of interior materials of existing pillars and measurement of the actual size, high pressure water washing, steel plate fabrication, plate delivery to the yard, installation of steel plates, filler filling, painting. Next, on reinforcement of viaduct pillars on the ground, the reinforcement design concept is basically same as in the open-cut tunnel. Points of difference in design and construction are explained. On the countermeasure for prevention of viaduct falling for girder bridges without the falling prevention, countermeasure investigation and design work or installation work are being carried out. Seismic resistance evaluation and design of existing bridges, and construction work are explained. 13 figs., 1 tab.

Some considerations about improvement for fatigue strength of structures; Shatai kozobutsu no hiro kyodo kojo ni kansuru ichikosatsu

Energy Technology Data Exchange (ETDEWEB)

Kimoto, H; Toyama, K; Maruyama, H; Magara, S [Press Kogyo Co. Ltd., Kanagawa (Japan)

1997-10-01

To reduce weight, higher tensile strength and/or thinner plate are used or considered in vehicle structures. In general, welded or notch sections, fatigue strength decreases because of increasing concentrated stress or effect of notch sensitivity and so on. In this paper, some methods are studied to improve fatigue strength and obtain a long life. 2 refs., 11 figs., 5 tabs.

Wave-free floating body forms for a shallow sea area; Senkaiiki no naminashi futai keijo ni tsuite

Energy Technology Data Exchange (ETDEWEB)

Kyozuka, Y; Nariai, Y [Kyushu University, Fukuoka (Japan)

1997-10-01

In column footing or semi-submergible type marine structures, a vertical wave force vanishes at a specific period of waves. This phenomenon is called wave-free characteristics. This wave-free characteristics make it possible to design marine structures superior in oscillation performance in waves. Since Bessho`s wave-free theory is useful only for an infinite water depth, this paper studied the wave-free theory for a shallow sea area. On a wave-free singularity and required floating body form, 2-D and 3-D axisymmetric floating body forms were determined, and vertical wave force characteristics of the obtained body forms were calculated and verified experimentally. Since the source term of the wave-free singularity was weaker in a shallow sea area than an infinite deep water area, resulting in the narrow width of the obtained wave-free body forms in a shallow sea area. The wave-free theory for a shallow sea area was verified by both numerical calculation based on a singularity distribution method and model experiment for these floating body forms. 3 refs., 10 figs.

Basic studies on design supporting system of offshore structure. Part 2. Implementation of structural design supporting system of offshore structures; Kaiyo kozobutsu wo taisho to shita sekkei shien system ni kansuru kisoteki kenkyu. 2. Kaiyo kozobutsu no kozo sekkei shien system no kochiku

Energy Technology Data Exchange (ETDEWEB)

Nomoto, T.; Hamada, K.; Aoyama, K. [The University of Tokyo, Tokyo (Japan)

1996-12-31

In order to improve the existing design-supporting system for offshore structures, new functions are added to evaluate information of the products, especially those for structural designs. The structural analysis system should be provided with a function of design modification, to efficiently support the structural analysis of these structures. The new system adds hierarchy of various offshore structure models and three-dimensional dimensions to clarify structural and geometrical constraints and design-modification function. The design-modification function is included by use of the hierarchy. The other new functions are finite element analysis systems for the main structure and components, and rigidity calculation for the main structure. The main structure and functional element models are confirmed to be useful also for utilization of information, and provide necessary information of the product models. 11 refs., 11 figs.

Basic studies on design supporting system of offshore structure. Part 2. Implementation of structural design supporting system of offshore structures; Kaiyo kozobutsu wo taisho to shita sekkei shien system ni kansuru kisoteki kenkyu. 2. Kaiyo kozobutsu no kozo sekkei shien system no kochiku

Energy Technology Data Exchange (ETDEWEB)

Nomoto, T; Hamada, K; Aoyama, K [The University of Tokyo, Tokyo (Japan)

1997-12-31

In order to improve the existing design-supporting system for offshore structures, new functions are added to evaluate information of the products, especially those for structural designs. The structural analysis system should be provided with a function of design modification, to efficiently support the structural analysis of these structures. The new system adds hierarchy of various offshore structure models and three-dimensional dimensions to clarify structural and geometrical constraints and design-modification function. The design-modification function is included by use of the hierarchy. The other new functions are finite element analysis systems for the main structure and components, and rigidity calculation for the main structure. The main structure and functional element models are confirmed to be useful also for utilization of information, and provide necessary information of the product models. 11 refs., 11 figs.

Design and model experiments on thruster assisted mooring system; Futaishiki kaiyo kozobutsu no thruster ni yoru choshuki doyo seigyo

Energy Technology Data Exchange (ETDEWEB)

Nakamura, M; Koterayama, W [Kyushu Univ., Fukuoka (Japan). Research Inst. for Applied Mechanics; Kajiwara, H [Kyushu Institute of Technology, Kitakyushu (Japan). Faculty of Computer Science and System Engineering; Hyakudome, T [Kyushu University, Fukuoka (Japan)

1997-12-31

Described herein are dynamics and model experiments of the system in which positioning of a floating marine structure by mooring is combined with thruster-controlled positioning. Coefficients of dynamic forces acting on a floating structure model are determined experimentally and by the three-dimensional singularity distribution method, and the controller is designed by the PID, LQI and H{infinity} control theories. A model having a scale ratio of 1/100 was used for the experiments, where 2 thrusters were arranged in a diagonal line, one on the X-axis. It is found that the LQI and H{infinity} controllers of the thruster can control long-cycle rolling of the floating structure. They allow thruster control which is insensitive to wave cycle motion, and efficiently reduce positioning energy. The H{infinity} control regulates frequency characteristics of a closed loop more finely than the LQI control, and exhibits better controllability. 25 refs., 25 figs.

Design and model experiments on thruster assisted mooring system; Futaishiki kaiyo kozobutsu no thruster ni yoru choshuki doyo seigyo

Energy Technology Data Exchange (ETDEWEB)

Nakamura, M.; Koterayama, W. [Kyushu Univ., Fukuoka (Japan). Research Inst. for Applied Mechanics; Kajiwara, H. [Kyushu Institute of Technology, Kitakyushu (Japan). Faculty of Computer Science and System Engineering; Hyakudome, T. [Kyushu University, Fukuoka (Japan)

1996-12-31

Described herein are dynamics and model experiments of the system in which positioning of a floating marine structure by mooring is combined with thruster-controlled positioning. Coefficients of dynamic forces acting on a floating structure model are determined experimentally and by the three-dimensional singularity distribution method, and the controller is designed by the PID, LQI and H{infinity} control theories. A model having a scale ratio of 1/100 was used for the experiments, where 2 thrusters were arranged in a diagonal line, one on the X-axis. It is found that the LQI and H{infinity} controllers of the thruster can control long-cycle rolling of the floating structure. They allow thruster control which is insensitive to wave cycle motion, and efficiently reduce positioning energy. The H{infinity} control regulates frequency characteristics of a closed loop more finely than the LQI control, and exhibits better controllability. 25 refs., 25 figs.

Reinforcing method for reinforced concrete structures by using carbon fibers; Tanso sen`i ni yoru tekkin concrete kozobutsu no hokyo koho

Energy Technology Data Exchange (ETDEWEB)

Tanaka, T.; Taniki, K. [Mitsubishi Kasei Corp., Tokyo (Japan); Kojima, N.; Kimura, K.; Katsumata, H. [Obayashi Corp., Osaka (Japan)

1994-08-15

This paper describes the development of a reinforcing method for reinforced concrete (hereinafter RC) structures by using carbon fibers (hereinafter CF). This developed method attaches a light-weight CFUD prepreg material for reinforcement by laterally winding CF strand impregnated with epoxy resin, which is hardened under normal temperature. This method is economical because no skills and special tools are required. An RC pillar with circular cross section and a hollow RC test body assuming a chimney were used as models. The paper details the experiment. This method has been used in several ten existing RC stacks with effective reinforcing result. Resistance strengths of CF strands and UD prepregs were verified in an accelerated exposure test performed according to JIS A 1415, standard for plastic building materials. The effects of the anti-seismic reinforcement have resulted in improvement in shear resistance force in RC pillars by means of CF winding method, improvement in bending stress in RC structures as a result of CF attaching method, and effectiveness in repair of existing RC stacks. Sufficient exposure resistance has also been proved. A bending test by means of two-point concentrated loading has been performed as a weighted test. 4 figs.

Evaluation on the effect of tsunami and seaquake on the floating structure; Tsunami kaishin no futai ni taisuru eikyo hyoka

Energy Technology Data Exchange (ETDEWEB)

Yoshida, K; Suzuki, H; Hosomi, I [The University of Tokyo, Tokyo (Japan); Nahata, H [The Long-Term Credit Bank of Japan, Ltd., Tokyo (Japan)

1997-12-31

The effects of tsunami and seaquake on large floating structures are theoretically studied, where these effects are followed in terms of local strength using the equation proposed by Sells to predict surface shapes changed by seaquake-caused uplift of the seabottom. The equation is combined with the one for tsunami propagation, to better predict the tsunami motion. The simulation results indicate the necessity of considering the effects of tsunami for the design of a large floating structure. The authors discuss that the effect of tsunami is minimized when a floating structure is set at a depth of at least 40 to 50m, chain length should be determined by equalizing the breaking weight with the load at which the structure starts to move, and a structure should be set at a position where it is not attacked by transverse waves. They also discuss that seaquake intensity should be predicted by the equation of motion of compressible fluid, and, noting local strength of a floating structure, it will not be damaged when it is at least 16mm thick under the conditions of 2m as seabottom uplift and 0.5m as draft depth. 15 refs., 9 figs., 2 tabs.

Evaluation on the effect of tsunami and seaquake on the floating structure; Tsunami kaishin no futai ni taisuru eikyo hyoka

Energy Technology Data Exchange (ETDEWEB)

Yoshida, K.; Suzuki, H.; Hosomi, I. [The University of Tokyo, Tokyo (Japan); Nahata, H. [The Long-Term Credit Bank of Japan, Ltd., Tokyo (Japan)

1996-12-31

The effects of tsunami and seaquake on large floating structures are theoretically studied, where these effects are followed in terms of local strength using the equation proposed by Sells to predict surface shapes changed by seaquake-caused uplift of the seabottom. The equation is combined with the one for tsunami propagation, to better predict the tsunami motion. The simulation results indicate the necessity of considering the effects of tsunami for the design of a large floating structure. The authors discuss that the effect of tsunami is minimized when a floating structure is set at a depth of at least 40 to 50m, chain length should be determined by equalizing the breaking weight with the load at which the structure starts to move, and a structure should be set at a position where it is not attacked by transverse waves. They also discuss that seaquake intensity should be predicted by the equation of motion of compressible fluid, and, noting local strength of a floating structure, it will not be damaged when it is at least 16mm thick under the conditions of 2m as seabottom uplift and 0.5m as draft depth. 15 refs., 9 figs., 2 tabs.

Topographical effects on wave exciting forces on huge floating structure. 2; Ogata futaishiki kaiyo kozobutsu ni sayosuru haryoku ni kansuru kenkyu. 2

Energy Technology Data Exchange (ETDEWEB)

Imai, Y [Hiroshima University, Hiroshima (Japan); Okusu, M [Kyushu Univ., Fukuoka (Japan). Research Inst. for Applied Mechanics

1997-12-31

A method to predict drift force acting on a floating structure has been developed for a marine structure consisting of a number of floating elements, positioned in a region having a slope at the sea bottom. When a huge marine structure, such as floating air port, is located in a coastal area, scale of the overall structure is very large, of the order of scale of water depth change. The new method assumes that a marine structure consisting of an infinite number of cylindrical floating elements is installed in parallel to the seashore, where symmetrical nature of the configuration allows to predict behavior of the whole system by analyzing one element. Integration of pressures acting on structure surfaces determines the horizontal component of the drift force acting on the structure. Being influenced by topography, drift force predicted peaks at a frequency different from that for the level predicted on the assumption of constant water depth. This indicates the necessity for consideration of seabottom slope and effects of broken waves at the seashore. 6 refs., 12 figs.

Topographical effects on wave exciting forces on huge floating structure. 2; Ogata futaishiki kaiyo kozobutsu ni sayosuru haryoku ni kansuru kenkyu. 2

Energy Technology Data Exchange (ETDEWEB)

Imai, Y. [Hiroshima University, Hiroshima (Japan); Okusu, M. [Kyushu Univ., Fukuoka (Japan). Research Inst. for Applied Mechanics

1996-12-31

A method to predict drift force acting on a floating structure has been developed for a marine structure consisting of a number of floating elements, positioned in a region having a slope at the sea bottom. When a huge marine structure, such as floating air port, is located in a coastal area, scale of the overall structure is very large, of the order of scale of water depth change. The new method assumes that a marine structure consisting of an infinite number of cylindrical floating elements is installed in parallel to the seashore, where symmetrical nature of the configuration allows to predict behavior of the whole system by analyzing one element. Integration of pressures acting on structure surfaces determines the horizontal component of the drift force acting on the structure. Being influenced by topography, drift force predicted peaks at a frequency different from that for the level predicted on the assumption of constant water depth. This indicates the necessity for consideration of seabottom slope and effects of broken waves at the seashore. 6 refs., 12 figs.

Outline in 1997 Japan compound material academic meeting technological prize winning technology. Kenchiku, doboku kozobutsu no hoshu[center dot]hokyo yo forukatousito no kaihatsu

Energy Technology Data Exchange (ETDEWEB)

Iba, Yoshitomo.; Uemura, Masahiko.; Murakami, Shinkichi.; Saito, Makoto.; Kobayashi, Akira. (Nittetsu Composite Corp., Tokyo (Japan))

1999-03-15

That function declines in the sutra time target, and it is finally destroyed, or a construction structure thing bears putting off that life by managing efficient maintenance it is possible. The factor of the function decline of the structure thing, the degree of the decline, and so on are grasped quantitatively, and efficient repair reinforcement time and a method of construction are chosen, and you must carry it out for that. It is paying attention to the development of the method of construction to reinforce the maintenance repair of the construction structure thing by using the tip compound factor from such a viewpoint. In the beginning, a material cost was very expensive, and the recognition not to use it was very general in such a construction field. In such recognition, in Tonen Corp. incorporated company, it has paid attention to the use possibility in the construction field of the tip compound factor since early, research and development have been done continuously from 1980, that It succeeds in, and it is the method of construction that a repair reinforces a concrete structure thing by the tip material that the method of construction which got the technological prize of the Japan compound material academic meeting in 1997 moved carbon fiber to the center. (NEDO)

Outline in 1997 Japan compound material academic meeting technological prize winning technology; Kenchiku, doboku kozobutsu no hoshu{center_dot}hokyo yo forukatousito no kaihatsu

Energy Technology Data Exchange (ETDEWEB)

Iba, Yoshitomo.; Uemura, Masahiko.; Murakami, Shinkichi.; Saito, Makoto.; Kobayashi, Akira. [Nittetsu Composite Corp., Tokyo (Japan)

1999-03-15

That function declines in the sutra time target, and it is finally destroyed, or a construction structure thing bears putting off that life by managing efficient maintenance it is possible. The factor of the function decline of the structure thing, the degree of the decline, and so on are grasped quantitatively, and efficient repair reinforcement time and a method of construction are chosen, and you must carry it out for that. It is paying attention to the development of the method of construction to reinforce the maintenance repair of the construction structure thing by using the tip compound factor from such a viewpoint. In the beginning, a material cost was very expensive, and the recognition not to use it was very general in such a construction field. In such recognition, in Tonen Corp. incorporated company, it has paid attention to the use possibility in the construction field of the tip compound factor since early, research and development have been done continuously from 1980, that It succeeds in, and it is the method of construction that a repair reinforces a concrete structure thing by the tip material that the method of construction which got the technological prize of the Japan compound material academic meeting in 1997 moved carbon fiber to the center. (NEDO)

Application of resistivity-based high-density prospecting to embankments with underground structure; Chika kozobutsu wo yusuru moritsuchi ni okeru hiteiko komitsudo tansa no tekiyosei

Energy Technology Data Exchange (ETDEWEB)

Matsui, T; Park, G [Osaka University, Osaka (Japan). Faculty of Engineering; Ueno, N [Dai Nippon Construction, Gifu (Japan); Park, K [Osaka University, Osaka (Japan)

1997-10-22

A structure was embedded in an embankment with homogeneous sandy soil. Resistivity was measured using three kinds of arrays, to investigate effects of the array on the underground structure. For a vertical structural model with high resistivity and a horizontal structural model with low resistivity, location of the underground structure could be grasped from the apparent resistivity profiles by individual arrays. For a transverse structural model with high resistivity, location of the underground structure could be grasped from the apparent resistivity profiles using Wenner array and pole-pole array. However, it could not be grasped from the apparent resistivity profile using dipole-dipole array. Based on the resistivity measurements for individual structural models, the dipole-dipole array was suitable for the vertical structural model, the pole-pole array was suitable for the transverse structural model, and the Wenner array was suitable for the horizontal structural model. Thus, the best apparent resistivity profiles and contrasts were obtained for individual structural models. 7 refs., 7 figs.

Construction of semi-underground type power plant in close vicinity of existing structures. Kisetsu kozobutsu ni kinsetsu shita han chika shiki hatsudensho no seko

Energy Technology Data Exchange (ETDEWEB)

Saito, K [Toshiba Ceramics Co. Ltd., Tokyo (Japan); Suda, H [Nippon Koei CO. Ltd., Tokyo (Japan); Kanazawa, S [Hazama-Gumi Ltd., Tokyo (Japan)

1991-01-30

The second Akashiba power station is of a semi-underground type and located on a steep slope between the Arakawa River and a national road. Therefore, there were many such problems to be solved for its construction as safety precaution for steep slope ground including the closely located national road, underwater work for the intake and outlet works, construction of tunnel below the present water level of the river in which deluges can be expected. Very severe conditions were imposed for the plan of the retaining walls, which are required for the prevention of landslide on the national road side, because of the problems of boundaries of the site, proprietary right, etc. The plan and design were studied for 3 cases, i.e. during drilling, at regular time and at the time of earthquake occurrence. Outlines of the drilling of the power plant shaft, mucking, timbering, spraying and spring water treatment are given. In connection with the control of measurement, subjects for measurement and the result of measurement are reported. Although this construction work was carried out under very severe conditions, it was completed in August, 1990 with no serious disaster. 13 figs., 5 tabs.

Development of sacrificial specimen for fatigue damage prediction of structure (2nd report); Kozobutsu no hiro sonsho yochi no tameno giseishikenhen no kaihatsu ( 2 )

Energy Technology Data Exchange (ETDEWEB)

Fujimoto, Y.; Huang, F.; Hada, K.; Sato, A.; Hamada, K.; Iwata, M. [Hiroshima Univ. (Japan)

1998-12-31

The study aims at applying the sacrificial specimen developed by the authors of the paper on practical structures, the sacrificial specimens are secured to a smooth specimen and a boxing welded joint, and fatigue tests are performed under varying stress amplitude. The load is cyclic 8 stage block load that has load frequency distribution similar to exponential distribution. Then, a fatigue life prediction of structural element is studied based on monitoring results of the sacrificial specimen. The obtained results are as follows. The sacrificial specimen shows steady fatigue property without occurrence of peeling off or buckling even under varying stress amplitude. A limited accumulated damage value of the sacrificial specimen is obtained under the varying stress amplitude. While arranging the crack growth curve of the varying sacrificial specimen in N/Nf, they show almost the same shape not depending on the life. The prediction method of fatigue life of a structure is described based on monitoring results of the sacrificial specimen. 9 refs., 16 figs., 2 tabs.

Proposal of new seismic assessment and retrofit technology for existing buildings; Hyogoken nanbu jishin higai wo kyokun to shita kison kozobutsu no taishin shindan system

Energy Technology Data Exchange (ETDEWEB)

Yoshioka, K.; Takahashi, Y.; Seki, M.; Tanida, M.; Akiyama, T.; Hashimoto, Y. [Obayashi Corp., Tokyo (Japan)

1995-08-10

A devastating earthquake measuring 7.2 on the JMA (Japan Meteorological Agency) magnitude hit the southern Hyogo Prefecture on January 17, 1995. This earthquake, the worst in Japan since the Great Kanto Earthquake in 1923, brought great disaster and destruction to the Hanshin area and Awajishima Island. Most of the damage to concrete and steel structures occurred in buildings designed according to former building codes. Fewer collapses occurred in buildings designed under current building code that have more severe seismic requirements. Existing buildings should be assessed by their seismic potentiality, and retrofitted to escape damage in severe earthquakes such as the Great Hanshin Earthquake. New technology for assessing and retrofitting existing buildings was developed to improve resisting performance in response to severe earthquakes. Earthquake Load or motion exceeding current requirements can be supplied to assess and retrofit existing buildings if a client wants their buildings to exhibit much stronger seismic resistance. The retrofit technologies, such as a base isolation system for whole building, vibration control bracing system with steel damper, and base isolation floor system for computer equipments, can be applied to existing buildings. 11 refs., 9 figs., 8 tabs.

Experimental study on the estimation method of hydrodynamic force acting on floating offshore structures; Futaishiki kaiyo kozobutsu ni kuwawaru ryutairyoku no suiteiho ni kansuru jikkenteki kenkyu

Energy Technology Data Exchange (ETDEWEB)

Hoshino, K; Kato, S [Ship Research Inst., Tokyo (Japan); Koterayama, W [Kyushu Univ., Fukuoka (Japan). Research Inst. for Applied Mechanics

1996-04-10

In the design of various floating offshore structures (FOS), the functionality, safety and amenity of FOSs were examined by estimating responses of FOSs to environmental external forces such as wave, wind and flow. In this paper, the estimation method of drag acting on the whole FOS was established by combining previous study results on hydrodynamic force acting on various bodies such as Reynolds number effect (RNE), 3-D effect (TDE) and interference effect (IE). This hydrodynamic force was also compared with that obtained from the experiment result on a FOS model for TLP to confirm the applicability of this estimation method. The estimation result on the drag coefficient in steady flow by considering RNE, TDE and IE well agreed with experimental one. The drag coefficient acting on FOSs in heaving could be estimated in practically sufficient accuracy by considering drag acting on not columns but only square columns. The estimation result on the drag coefficient acting on FOSs in surging by considering RNE, TDE and IE well agreed with experimental one. 12 refs., 10 figs., 1 tab.

Countermeasure for the magnetic drag force in guideway structure of superconducting magnetic levitation Vehicle system (MAGLEV); Chodendo jiki fujoshiki tetsudo no kozobutsu ni okeru denjiki taisaku

Energy Technology Data Exchange (ETDEWEB)

Ichikawa, A [JR Railway Technical Research Inst., Tokyo (Japan)

1995-02-15

As for the levitation vehicle system, the vehicle is equipped with superconducting magnets and is levitated about 10cm by the electromagnetic force that works between the push coil and levitation guide coil laid on the ground and it runs 500km an hour. But, the running resistance and energy loss called as magnetic resistance caused by the electromagnet phenomenon that generates between the superconducting magnets and structures (steel products) generate. In this paper, the magnet resistance generated in guideway structure of superconducting magnetic levitation vehicle system and its countermeasures therefor are introduced. The main countermeasures against the magnetic resistance are as follows. The steel products have to be as arranged as separated from the superconducting magnets as far as possible in the permissible design limit. Based on the analysis results the low magnetic steel would be used in an area within 1.5m from the strand of the superconducting magnet. The contact resistance of the joints part of loop-shaped components would be bigger so as to do not cause the loop current. And the big component would be divided into small parts when it is used near to the superconducting magnets. 5 refs., 10 figs.

Studies on surface tension effect for free surface flow around floating models; Futai mokei mawari no jiyu hyomenryu ni oyobosu hyomen choryoku no eikyo ni kansuru kenkyu

Energy Technology Data Exchange (ETDEWEB)

Suzuki, K [Yokohama National Univ., Yokohama (Japan). Faculty of Engineering; Akiba, H [Toyo Construction Co. Ltd., Tokyo (Japan)

1997-12-31

The effect of surface tension on free surface flow around floating models is discussed experimentally and numerically. Three-dimensional free surface flow around vertical circular cylinders floating in a circulating water channel was visually observed, where a surface-active agent was added to water. The results are analyzed using Weber number. The numerical analysis was done for vertical cylinder and CY100 models using the Rankine source method. Weber number of at least around 120 is necessary to eliminate the effect of surface tension from free surface flow around the CY100 model. The numerical analysis for the cylinder model needs simulation with wavelength shorter than that of free surface wave used by the Rankine source method. The model for the resistance test should be at least around 7m long to eliminate the effect of surface tension at Froude number of 0.1 or higher. 15 refs., 12 figs., 2 tabs.

Studies on surface tension effect for free surface flow around floating models; Futai mokei mawari no jiyu hyomenryu ni oyobosu hyomen choryoku no eikyo ni kansuru kenkyu

Energy Technology Data Exchange (ETDEWEB)

Suzuki, K. [Yokohama National Univ., Yokohama (Japan). Faculty of Engineering; Akiba, H. [Toyo Construction Co. Ltd., Tokyo (Japan)

1996-12-31

The effect of surface tension on free surface flow around floating models is discussed experimentally and numerically. Three-dimensional free surface flow around vertical circular cylinders floating in a circulating water channel was visually observed, where a surface-active agent was added to water. The results are analyzed using Weber number. The numerical analysis was done for vertical cylinder and CY100 models using the Rankine source method. Weber number of at least around 120 is necessary to eliminate the effect of surface tension from free surface flow around the CY100 model. The numerical analysis for the cylinder model needs simulation with wavelength shorter than that of free surface wave used by the Rankine source method. The model for the resistance test should be at least around 7m long to eliminate the effect of surface tension at Froude number of 0.1 or higher. 15 refs., 12 figs., 2 tabs.

Study on the blasting demolition of steel construction. Part 2. Demolition work of steel tower; Tekkotsu kozobutsu no bakuha kaitai ni kansuru kenkyu. 2. Koro yagura happa kaitai koji

Energy Technology Data Exchange (ETDEWEB)

Ogata, Y.; Wada, Y.; Katsuyama, K. [National Institute for Resources and Environment, Tsukuba (Japan); Nishida, T.; Hoshino, M.; Nagano, M. [Kacoh Co. Ltd., Tokyo (Japan)

1997-06-30

This paper describes the blasting demolition of steel tower of iron works. The steel tower had four columns, and its dimension was 17 mtimes17 m in cross section and 77.6 m height. The total weight was about 1,724 t. The 18.4 kg V-type linear shaped charge was fixed around columns with box weld structures, and initiated using 16 seismograph electric detonators. Vibration and noise were measured during blasting and collapse of the tower. In the both case, the vibration levels were between 67 and 71 dB, which were low and under 75 dB, the standard level during specific construction works of the regulation act of vibration. The noise level was 120 dB(A) at the point 200 m away from the blasting source, which was over 85 dB(A), the standard level. The collapse process of steel tower was simulated using discontinuous deformation analysis. The results agreed well with those from the actual collapse. The steel tower landed about 6 seconds after the initiation, and it took about 15 seconds to complete the collapse. Before the demolition, the 6 t parts of forefeet of two columns in the collapse direction were cut and removed by blasting. Thus, the collapse was controlled in the given direction. 5 refs., 13 figs., 2 tabs.

Ultimate strength analysis of thin plated structures using eigen-functions. 3rd Report. Application to reliability analysis; Koyu kansu wo mochiita usuita kozobutsu no dansosei kaisekiho. 3. Shinraisei kaiseki eno oyo

Energy Technology Data Exchange (ETDEWEB)

Ueda, Y. [Osaka University, Osaka (Japan). Welding Research Institute; Masaoka, K.; Okada, H. [University of Osaka Prefecture, Osaka (Japan). Faculty of Engineering

1996-12-31

A reliability analysis was performed on ultimate strength of a hull by introducing reliability engineerings into the idealized structural unit method. Elements developed under the present study were applied to a model of an actual structure to indicate that even an analysis requiring much time under the finite element method can be performed in a short time and at high accuracy when this method is used. Analysis acted with bending moment and shear force simultaneously was performed on a model used as a structure in experiments carried out by Nishihara, assuming pure bending moment and longitudinal strength during slamming. Then, a reliability analysis was conducted on the same model based on this analysis method to investigate the ultimate strength. In an analysis of an ultimate strength when bending and shearing that assume slamming act upon simultaneously, axial force in the hull side decreases as loading increases, wherein how the shearing force increases can be identified clearly. Although existence of initial bends reduces the strength, the effect of variance in the vicinity of the average value on the reliability is rather small, while the effect due to variance in yield stress is greater. 27 refs., 14 figs., 4 tabs.

Ultimate strength analysis of thin plated structures using eigen-functions. 3rd Report. Application to reliability analysis; Koyu kansu wo mochiita usuita kozobutsu no dansosei kaisekiho. 3. Shinraisei kaiseki eno oyo

Energy Technology Data Exchange (ETDEWEB)

Ueda, Y [Osaka University, Osaka (Japan). Welding Research Institute; Masaoka, K; Okada, H [University of Osaka Prefecture, Osaka (Japan). Faculty of Engineering

1997-12-31

A reliability analysis was performed on ultimate strength of a hull by introducing reliability engineerings into the idealized structural unit method. Elements developed under the present study were applied to a model of an actual structure to indicate that even an analysis requiring much time under the finite element method can be performed in a short time and at high accuracy when this method is used. Analysis acted with bending moment and shear force simultaneously was performed on a model used as a structure in experiments carried out by Nishihara, assuming pure bending moment and longitudinal strength during slamming. Then, a reliability analysis was conducted on the same model based on this analysis method to investigate the ultimate strength. In an analysis of an ultimate strength when bending and shearing that assume slamming act upon simultaneously, axial force in the hull side decreases as loading increases, wherein how the shearing force increases can be identified clearly. Although existence of initial bends reduces the strength, the effect of variance in the vicinity of the average value on the reliability is rather small, while the effect due to variance in yield stress is greater. 27 refs., 14 figs., 4 tabs.

On the hydroelastic response of box-shaped floating structure with shallow draft. Tank test with large scale model; Senkitsusui hakogata futai no harochu dansei oto ni tsuite. Ogata mokei ni yoru suiso shiken

Energy Technology Data Exchange (ETDEWEB)

Yago, K; Endo, H [Ship Research Inst., Tokyo (Japan)

1997-12-31

The hydroelastic response test was carried out in waves using an approximately 10m long large model, and the numerical analysis was done by the direct method, for a commercial-size (300m long) box-shaped floating structure with shallow draft. The scale ratio of the model is 1/30.8, and the minimum wave cycle is around 0.7s from wave-making capacity of the tank, which corresponds to 4 to 14s with the commercial-size structure. Elastic displacement and bending strain were measured. The calculated results by the direct method are in good agreement with the observed results. The fluid dynamic mutual interference effects between elements are weak in added mass but strong in damping force, indicating that the range of mutual interference is strongly related to rolling cycle in the range of mutual interference. Wave pressure on the floating structure bottom is high at the upper side of the wave, greatly damping towards the downside of the wave. However, response amplitude of elastic displacement tends to increase at the ends, both in upside and downside of the wave. For the floating structure studied, the 0 to 4th mode components are predominant in longitudinal waves, and the 6th or higher mode components are negligibly low. 21 refs., 15 figs., 2 tabs.

FY 1999 Report on overseas geological structure surveys. Joint Japan-China Yu Xian exploitation project (Attachments); 1999 nendo kaigai chishitsu kozo nado chosa futai shiryo. Nippon Chugoku sekitan kyodo tansa Yu Xian project

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NONE

2000-03-01

This reports provides the attachments for the report JN0041264. The contents include (1) minutes of the fourth steering committee, (2) technical reports presented to the fourth steering committee (I: report on FY 1998 joint exploitation works, and II: report on FY 1999 joint exploitation works), (3) minutes of the fifth steering committee, and (4) technical reports presented to the fifth steering committee (I: report on FY 1999 joint exploitation works, and II: report on planned FY 2000 joint exploitation works). The item (1) includes approval of the reports on FY 1998 and 1999 joint exploitation works. The item (2)-I report includes seismic exploitation test works, observation work results and quality evaluation thereof; drilling exploitation work results, quality evaluation thereof, exploitation results and evaluation thereof; exploitation results and evaluation thereof; and proposals. The item (2)-II report includes seismic exploitation, drilling exploitation, and man-hours of the workers from the both countries. The item (3) includes approval of the reports on FY 1999 joint exploitation works and planned FY 2000 joint exploitation works. The (4)-I report includes seismic exploitation work results and evaluation thereof, seismic exploitation test works, drilling exploitation work results, quality evaluation thereof, exploitation results and evaluation thereof, and proposals for the future works. The (4)-II report includes seismic and drilling exploitation plans, and numbers and periods of the workers from the both countries. (NEDO)

On the hydroelastic response of box-shaped floating structure with shallow draft. Tank test with large scale model; Senkitsusui hakogata futai no harochu dansei oto ni tsuite. Ogata mokei ni yoru suiso shiken

Energy Technology Data Exchange (ETDEWEB)

Yago, K.; Endo, H. [Ship Research Inst., Tokyo (Japan)

1996-12-31

The hydroelastic response test was carried out in waves using an approximately 10m long large model, and the numerical analysis was done by the direct method, for a commercial-size (300m long) box-shaped floating structure with shallow draft. The scale ratio of the model is 1/30.8, and the minimum wave cycle is around 0.7s from wave-making capacity of the tank, which corresponds to 4 to 14s with the commercial-size structure. Elastic displacement and bending strain were measured. The calculated results by the direct method are in good agreement with the observed results. The fluid dynamic mutual interference effects between elements are weak in added mass but strong in damping force, indicating that the range of mutual interference is strongly related to rolling cycle in the range of mutual interference. Wave pressure on the floating structure bottom is high at the upper side of the wave, greatly damping towards the downside of the wave. However, response amplitude of elastic displacement tends to increase at the ends, both in upside and downside of the wave. For the floating structure studied, the 0 to 4th mode components are predominant in longitudinal waves, and the 6th or higher mode components are negligibly low. 21 refs., 15 figs., 2 tabs.

FY 2000 survey of the geological structure overseas, etc. Japan-China joint coal exploration - Yu Xian project; 2000 nendo kaigai chishitsu kozo nado chosa - futai shiryoshu. Nippon Chugoku sekitan kyodo tansa Yu Xian project

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NONE

2001-03-01

This data book summarized the proceedings and the technical report of the management committee on the Japan-China geological structure survey based on the consultation concluded between NEDO and China's bureau of coal field geology and a report meeting on the Yu Xian project. In the exploration, conducted were the boring survey of 10 boreholes, seismic survey of 2D (71 traverse lines, 180.105km) and 3D (1.5km{sup 2}), VSP (6 holes (345 shots)) and the low velocity band survey (2,072 shots). The geological structure of the area presented the syncline structure with a gentle line associated with foldings and a number of faults and was classified into the medium class or the class of a little complication in the Chinese standard. The number of the faults confirmed in this exploration totaled 57. Coal reserves by coal seam were 157.22 million tons at No. 5 seam and 102.57 million tons at No. 1 seam. The total amount of the two seams was 79.1% of the total coal amount in all area. The coal quality of Nos. 1 and 5 was brown coal - flame coal in the Chinese classification, and subbituminous coal B - subbituminous coal C in the ASTM classification. The coal, however, cannot be used for process raw coal. There is a technical potentiality of the fixed bed pressurized gasification. (NEDO)

FY 1992 report on the survey of geothermal development promotion. Geochemical survey (No. A-1 - Haneyama area); 1992 nendo chinetsu kaihatsu sokushin chosa chijo chosa hokokusho futai shiryo. Chikagaku chosa hokokusho (No. A-1 Haneyama chiiki)

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NONE

1993-05-01

For the purpose of studying an expanse and characteristics of the geothermal system and a possibility of geothermal development in the Haneyama area, Oita Prefecture, geochemical survey was conducted. In the survey, various kinds of analyses were made for 13 specimens of hot spring water and 5 specimens of surface water in the area of about 280km{sup 2} at 402 measuring points of the concentration of Hg in soil gas. The results of the survey were as follows: In this survey area, it was thought that the HCO{sub 3} type geothermal water of a comparatively low temperature which was heated by the wide-spread conduction heat from the depths was widely distributed deeper than the depth of 500-700m, and it was presumed that a possibility was low of existence of a high geothermal potential which can be used for the geothermal power generation in the part deeper than the drilling depth of 700m. In the Noya area in the southwest part of the survey area, the high temperature deep geothermal reservoir was confirmed. In this area, the high temperature neutral-alkalescent Cl-SO{sub 4} type geothermal water was distributed in the depth of several 100 meters or deeper. The geothermal water seemed to flow from NE to SW along the structure in the NE-SW direction, and it was concluded that the area was the most promising one. (NEDO)

FY 1992 report on the survey of geothermal development promotion. Gravity prospecting (No. A-1 - Haneyama area); 1992 nendo chinetsu kaihatsu sokushin chosa chijo chosa hokokusho futai shiryo. Juryoku tansa hokokusho (No. A-1 Haneyama chiiki)

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NONE

1993-05-01

For the contribution to elucidation of the geothermal structure in the Haneyama area in Oita Prefecture, gravity prospecting was conducted. Survey was carried out in the area of about 280km{sup 2} at 205 measuring points, and analysis was made altogether with the existing 3,273 gravity measuring points. As a result, the following were made clear. The gravity basement forms the fault-state structure that sinks several 100 meters to the south side on the line from the south edge of the Higashi-shiiya ridge to Mt. Kurotake - Mt. Daigansen - Amagase hot spring in the SW direction. This fault was made correspondent to the Beppu north fault on the east side of Mt. Kurodake. Each of the following regions is the region where the fault-state structure that predicts the development of fracture and the area of distribution of alteration zone that can be cap rock overlap each other: NW edge of Shishimuta sedimentation zone - Machida alteration zone distribution area; N edge of the Shishimuta sedimentation zone - Ibushi alteration zone/Noya alteration zone distribution area; Vicinity of Mt. Kurodake - Hijiu alteration zone distribution area. It seems that the above-mentioned regions have high potentiality of geothermal exploration. The region where new igneous activities are seen, which is near the heat source, is important for exploration. The distribution area is seen near the west of the Mizuwake Pass ridge. (NEDO)

Report for fiscal 1980 on comprehensive survey for nationwide geothermal resources. Survey on Curie point method (Associated material - operation flight report); 1980 nendo zenkoku chinetsu shigen sogo chosa hokokusho. Curie tenho chosa (futai shiryo sagyo shinchoku hokokusho)

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NONE

1981-10-01

With an objective to identify the status of distribution of deep underground thermal structure, aerial magnetism investigations were executed in the south Kyushu area, and data used in the Curie point method were collected. This paper summarizes the progresses and achievements of the work during the investigation. The report for April 1981 summarized preparation of equipment and materials by EG and G Geometrics Corporation, and the work schedules with the Idemitsu Geothermal Development, Petroleum Resources Development, and Naka-Nippon Airways. The report for April 22 compiled the site preparation and the test flight. The report for April 28 compiled the calibration and magnetism compensation flight. The report for May 5 compiled the implementation of the second flight , and the result of survey for 292 km in total. The report for May 10 compiled the implementation of the third to fifth flights, and the results of measurements for 584 km, 519 km and 360 km, respectively. The report for May 18 compiled the implementation of the sixth to eighth (final) flights, and the results of measurements for 513 km, 584 km and 68 km, respectively. (NEDO)

Investigation on the dynamic response and strength of very long floating structures by beam modeling on an elastic foundation; Dansei shishojo no hari model ni yoru chodai futai kozo no doteki tawami kyodo tokusei ni kansuru kosatsu

Energy Technology Data Exchange (ETDEWEB)

Tsubogo, T.; Okada, H. [University of Osaka Prefecture, Osaka (Japan). Faculty of Engineering

1997-08-01

A very large floating structure was replaced with the beam on an elastic foundation to examine the response characteristics in waves. Another evidence was regularly and numerically given for the basic characteristics of a very large floating body Suzuki found. New information was also obtained. The frequency response is mainly classified into a wave number control area and proper frequency control area when buoyancy elasticity exists. When the buoyancy structure is long and flexible, the proper frequency becomes continuous and the frequency control area becomes a resonance area. In the wave number control area, the Suzuki`s characteristic wave number becomes a control parameter, and various characteristic values are indicated by characteristic wave numbers. The response in the wave number control area becomes quasi-static when the distribution mass of buoyancy is fully small. The design in which the distribution mass of buoyancy is fully large must be avoided. In the displacement amplitude, the mass on the free end is severest. The proper frequency of vertical vibration relatively moves to the high-frequency side when buoyancy is considered as an elastic foundation. Attention must be thus paid to the proper frequency of vibration on the horizontal surface. 9 refs., 12 figs., 3 tabs.

FY 1994 report on the survey of geothermal development promotion. Complementary survey on the fracture system, etc. (Wasabizawa area); 1994 nendo chinetsu kaihatsu sokushin chosa sogo kaiseki hokokusho futai shiryo. Wasabizawa chiiki danretsu kei tou hokan chosa hokokusho

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NONE

1995-12-01

For the contribution to elucidation of the geothermal structure in the Wasabizawa area, Akita Prefecture, survey by the paleomagnetic measurement and fracture system measurement was conducted of the borehole cores and specimens of outcrop granite obtained from boreholes of N6-WZ-3 and N6-WZ-4. In the survey, the following were carried out: measurement of the core fracture system of N6-WZ-3 (102-1,505m) and N6-WZ-4 (507-1,556m), paleomagnetic measurement of 9 outcrop granite specimens and 16 core specimens, and k/Ar age determination of 3 outcrop granite specimens. As a result of the paleomagnetic measurement of outcrop granite, the magnetization azimuth of the schistose granodiorite distributed in Kuwanosawa was regarded as almost NS. The measured magnetization azimuth of the core specimen obtained from the same rock mass was also made NS-based, and measurement of the fracture in the neighborhood was made. As a result, it was found out that the NNW system was dominant in dikes and that there was the NE system in most of the small geothermal channels. The fracture system of well tended to develop around the boundary between granite and metamorphic rock, and it was thought that this part could be a reservoir if temperature conditions are prepared. (NEDO)

FY 1992 report on the survey of geothermal development promotion. Electromagnetic exploration (TDEM method) (No. A-1 - Haneyama area); 1992 nendo chinetsu kaihatsu sokushin chosa chijo chosa hokokusho futai shiryo. Denji tansa (TDEM ho) hokokusho (No. A-1 Haneyama chiiki)

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NONE

1994-03-01

For the purpose of elucidating a possibility of existence of geothermal reservoirs in the Haneyama area, Oita Prefecture, Electromagnetic survey by the TDEM method was conducted. The survey was made for the area of 80km{sup 2} at 105 measuring points in the south of the Haneyama area, and the resistivity structure reaching the depth of 4,000m from the earth surface was made clear. The resistivity structure in this area is composed of 4 layers: upper medium resistivity layer, central medium resistivity layer, central low resistivity layer and lower high resistivity layer. The resistivity structure discontinuous line ranges between the uplift zone of basement and the sedimentation zone, and the greater part of the alteration zone is distributed and arranged concomitant with the position and direction of the line. As the region with high potential of geothermal existence, cited were the low resistivity zone distributed in the west of the resistivity structure discontinuous line that continues from Mt. Fukuman to the south, the low resistivity zone distributed in the north of the resistivity structure discontinuous line from Noya to the west, and the low resistivity zone distributed in the north of Hosenji and lying between resistivity structure discontinuous lines. (NEDO)

Development of highly workable concrete, 'Neuro-crete'. Part 1. ; Basic properties of Neuro-crete and application to large-scale structures with heavy-reinforcement. Koryudo concrete (Neuro crete) no kaihatsu. 1. ; Neuro crete no kiso bussei to kamitsu haikin wo yusuru doboku kozobutsu eno tekiyo

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Miura, N; Chikamatsu, R; Sogo, S; Haga, T; Iriya, K; Taniguchi, M [Obayashi Corp., Tokyo (Japan)

1993-08-10

This paper introduces a highly workable concrete, 'Neuro-crete' developed for the purpose of simplifying construction of concrete structures and improving their guality. This concrete has a feature that it can reduce or eliminate a compacting process. Resistance to separation of coarse aggregate from mortar (separation resistance) is required. A difference of the material from conventional concrete is an increased unit particulate amount (binder + inert particulate). The binders may include cement, blast furnace slag particulate, flyash, silica fume, and expander. The inert particulate may be limestone powder. Kinds and mixing ratio of binders are important in improving fluidity. The separation resistivity is largely affected by a water-cement ratio and a water-binder ratio. A flow distance limit exists to maintain the fluidity without decreasing the compression strength after curing. The internal structure having become denser suppresses progress of neutralization or salt penetration. Drying contraction is equivalent to or less than the conventional concrete. 5 refs., 30 figs., 3 tabs.

Fiscal 1989 geothermal development promotion survey. Annex to on-the-ground survey report, geothermal development promotion survey (Geochemical survey report - No. 32: Hachijojima district); 1989 nendo chinetsu kaihatsu sokushin chosa chijo chosa hokokusho futai shiryo (Chikagaku chosa hokokusho - No.32 Hachijojima chiiki)

Energy Technology Data Exchange (ETDEWEB)

NONE

1989-11-01

A geochemical survey was conducted by examining soil gas and hot spa water temperature for contributing to the clarification of the subsurface geothermal structure in the Hachijojima district, Tokyo. Mercury concentration, carbon dioxide gas concentration, and 1 m-deep temperature were measured at 155 sites; and chemical and isotope analyses were conducted for 10 specimens of hot spa water and 6 specimens of surface water. After examination, 5 significant locations were isolated at the regions of Yaene-Ogago, Taredo, the northern foot of Mt. Nishi to Weather Station, the southern foot of Mt. Higashi, and the region to the south of Mt. Higashi with hot spa distributed therein. The significant locations are situated in the vicinity of a mar that produced deposit by magma-steam eruption, an alteration zone, and the parasitic volcano in Mt. Higashi, and in an area with hot spa distributed therein. It is therefore concluded that they are closely related with volcanic activities. It is inferred that geothermal signs in the Mt. Nishi area reflect a relatively deep-seated structure. As for the mercury and carbon dioxide gas concentration levels in the Mt. Higashi area, it is inferred that they again represent geothermal signs reflecting a relatively deep-seated structure. (NEDO)

Fiscal 1998 investigation of geothermal development and promotion in Akinomiya area survey. Report on exploratory drilling/well survey and incidental work (1/2); 1998 nendo chinetsu kaihatsu sokushin chosa Akinomiya chiiki chosa hokokusho. 1/2. Shisui kussaku koji kosei chosa oyobi futai koji

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NONE

2000-01-01

Exploratory drilling and well survey were conducted, for the purpose of grasping underground geological structure, temperature and physical properties of Akinomiya area, Akita prefecture, as a part of fiscal 1998 investigation of geothermal development and promotion. The exploratory drilling well N10-AY-6 was excavated to the depth of 1,701 m. This well had a small lost circulation of about 4.2 kL/h at the end of drilling; hence, pressurized water injection was carried out for the purpose of enhancing the performance as a reducing well, resulting in an improvement to 21.6 kL/h. The well N10-AY-7 was in the bedrocks of the Old Tertiary system at the depth of 492 m or deeper, which revealed that the Old Tertiary bedrocks lay more shallowly than expected. At the depth of 1,900 m, the maximum temperature showed 223.3 degree C. In a temperature recovery test, it climbed to 277.2 degree C at the depth of 1,400 m. In the well N10-AY-8, the Old Tertiary bedrocks were found drilled at the depth of 87 m or deeper. Inside well temperatures at the time of temperature recovery test showed nearly the same degrees from the depth of 880 m to 1,090 m or about, thereafter rising until the depth of 1,330 m, further rising from 1,370 m until the bottom of the well, and showing the maximum temperature of 277.0 degree C at the depth of 1,450 m. (NEDO)

FY 1992 report on the survey of geothermal development promotion. Geological structure (geology/alteration zone) survey (No. A-1 - Haneyama area); 1992 nendo chinetsu kaihatsu sokushin chosa chijo chosa hokokusho futai shiryo. Chishitsu kozo (chishitsu henshitsutai) chosa hokokusho (No. A-1 Haneyama chiiki)

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NONE

1993-05-01

For the purpose of elucidating a possibility of existence of geothermal reservoirs in the Haneyama area, Oita Prefecture, survey of the geological structure (geology/alteration zone) was conducted. The survey was made for the area of 280km{sup 2} lying from Kusu Town to Kokonoe Town, Oita Prefecture in terms of the route survey of 174km, fabrication/judgement of 52 rock slices, whole rock chemical analysis of 21 rocks, age determination, analysis of rock mineral, X-ray diffraction, literature collection, etc. As a result of the survey, the following conclusion was obtained. When considering a possibility of existence of heat source near this area, the area near the present volcanic front was regarded as promising. The fracture structure in the depths seen in the gravity structure (part of sharp dip of gravity) is more closely related to activity of geothermal water than the active structure of E-W system near the earth surface newly formed and is important when considering the existence of geothermal resource. The periphery of the Shishimuta sedimentation zone where Takigami, Oodake, Hacchobaru and Oguni are located was especially regarded as an area propmising of geothermal energy. In the survey area, the geothermal potential was the highest near Noya - Mizuwake Pass. (NEDO)

FY 1991 report on the survey of geothermal development promotion. Electromagnetic exploration (High accuracy MT method) (No.38 - West area of Mt. Aso); Chinetsu kaihatsu sokushin chosa chijo chosa hokokusho futai shiryo. 1991 nendo chinetsu kaihatsu sokushin chosa - Denji tansa (Koseido MT ho) hokokusho (No.38 Asosan seibu chiiki)

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NONE

1991-12-01

As a part of the survey of geothermal development promotion in FY 1991, electromagnetic exploration by the high accuracy MT method was conducted to acquire the information on the geothermal structure in the west area of Mt. Aso, Kumamoto Prefecture. The electromagnetic exploration was made in the area of about 65km{sup 2} at 52 measuring points for 3 measuring components in the magnetic field/2 measuring components in the electric field at 20 measuring frequencies or more in the range of 0.01Hz-20kHz for 4 hours or more. As a result of the survey, the resistivity structure indicated a 3-layer structure inside the Aso caldera. It was thought that the lowest layer was correspondent to the geological basement (Pre-tertiary system). As to the resistivity discontinuous lines extracted from sudden changes in depth distribution and resistivity distribution of the resistivity basement, those in NS direction are conspicuous and those in EW direction also exist inside the caldera. Around the part where these resistivity discontinuous lines of both NS and EW systems cross each other inside the caldera, the Yunoya hot spring and Tarutama hot spring which indicate the geothermal manifestation are located, and acid alteration zones were seen on the earth's surface in the periphery. (NEDO)

Report for fiscal 1981 on comprehensive survey for nationwide geothermal resources. Survey on radar imaging method - geothermal analysis conception design (Associated material 2 - reports on U.S. consultants); 1981 nendo zenkoku chinetsu shigen sogo chosa hokokusho. Radar eizoho chosa (chinetsu kaiseki gainen sekkei futai shiryo 2 (Beikoku consultant hokokusho))

Energy Technology Data Exchange (ETDEWEB)

NONE

1982-10-01

Three technical and business proposals for comprehensive analysis of the survey data for nationwide geothermal resources in Japan were submitted from three U.S. candidate contractor groups, whose evaluations were reported by the Republic Geothermal, Inc. The group comprising of the Aero Service and Golder Associates has few geological engineers, and their engineers related to physical exploration has no experience whatsoever in the geothermal field. The group comprising of the EG and G Corporation, Geometrics, Utah University Research Institute, Mars, and Republic Geothermal, Inc. requires a maximum amount of time and travel expense to adjust the implementations done by four companies. However, this is a group having the largest pan-world geothermal experience, and much experience about Kyushu area of Japan. The group comprising of QEB, Inc., Eureka, and GSC, Inc. requires considerable amount of time and travel expense because of the implementation performed by three companies. The group has some geothermal experience in America, but none whatsoever in Japan. Holding or not holding persons with geothermal experience is an important criterion in selecting the contractors. (NEDO)

Fiscal 1989 geothermal development promotion survey report. Data sampled by ground based survey and attached to the report (Electromagnetic surveillance - TDEM - No. 32. Hachijo Island region); Chinetsu kaihatsu sokushin chosa chijo chosa hokokusho futai shiryo. 1989 nendo chinetsu kaihatsu sokushin chosa denji tansa (TDEM ho) hokokusho (No. 32 Hachijojima chiiki)

Energy Technology Data Exchange (ETDEWEB)

NONE

1989-11-01

A TDEM (time domain electromagnetic) surveillance was conducted for the Hachijo Island region, Tokyo. The survey covered a 70 km{sup 2} area, with 81 observation stations. There was a distance of 1 km or more between transmission electrodes, the signal was a rectangular wave with a cycle of 16 seconds or more, the sending current was 60 A or more, and the shortest distance between a transmission electrode and an observation station was 2.5 km or more. A subsurface structure model was proposed after the analysis of the collected data, which is described below. In the Mt. Nishiyama district, the deep-seated magnetic substance, high-conduction zone, and the low gravity anomaly zone were found to be roughly equal to each other in terms of distribution. It is inferred that the low gravity anomaly results from reduction in resistivity by the progress of fractioning of rocks due to the intrusion of a magnetized rock into the depth and from mass defect due to volcanic eruption. In the Mt. Higashiyama district, a high density rock intrudes in the ENE-WSW direction for the creation of a high gravity anomaly belt, and it is inferred that alteration occurred along the southern rim of the belt, that magnetic substance was produced in the cavity-abundant portion, and that a volcano with several craters rose at the middle of the portion. (NEDO)

FY 1991 report on the survey of geothermal development promotion. Attached data. Electromagnetic exploration (High accuracy MT method) (No.38 - West area of Mt. Aso); Chinetsu kaihatsu sokushin chosa chijo chosa hokokusho futai shiryo. 1991 nendo chinetsu kaihatsu sokushin chosa - Denji tansa (Koseido MT ho) hokokusho (No.38 Asosan seibu chiiki - Tenpu shiryo)

Energy Technology Data Exchange (ETDEWEB)

NONE

1991-12-01

As a part of the survey of geothermal development promotion in FY 1991, electromagnetic exploration by the high accuracy MT method was conducted to acquire the information on the geothermal structure in the west area of Mt. Aso, Kumamoto Prefecture. The detailed data were arranged as the data attached to the report on the electromagnetic exploration. As the attached data, included were the results of the 1D analysis (measuring/analysis {rho}a-F chart, analytic structure drawing), results of the 1D analysis (numerical list of the apparent resistivity analytic value and inverse analytic value) and numerical list of the apparent resistivity measured value. (NEDO)

Report for fiscal 1981 on comprehensive survey for nationwide geothermal resources. Survey on radar imaging method - geothermal conception design (Associated material 3 - materials related to U.S. geothermal analysis contractors and consultants); 1981 nendo zenkoku chinetsu shigen sogo chosa hokokusho. Radar eizoho chosa (chinetsu kaiseki gainen sekkei futai shiryo 3 (Beikoku chinetsu kaiseki contractor oyobi consultant kankei shiryo))

Energy Technology Data Exchange (ETDEWEB)

NONE

1982-10-01

This paper summarizes the U.S. geothermal analysis contractors, including the Aero Service Corporation, the EG and G Group, the QEB Group, and the Republic Geothermal, Inc., and the consultants, including the Remote Sensing Consultants. For the Aero Service Corporation, the paper states histories of and books written by major personnel. For the EG and G Group, the paper states the outlines of such companies as EG and G Services, EG and G Geometrics, Mars Associates, Inc., and UURI, as well as histories of and books written by major personnel. For the QEB Group, the paper states the outlines of such companies as QEB, Inc., and Eureka Resource Associates, Inc. as well as histories of and books written by major personnel. For the Republic Geothermal, Inc., the paper states the company outline, histories of and books written by major personnel. For the Remote Sensing Consultants, the paper states the history of and books written by Dr. R.J.P.L. Lyon. (NEDO)

Fiscal 1998 geothermal development promotion survey. Annex to on-the-ground survey report, geothermal development promotion survey (Part 2. Electromagnetic surveillance using simplified MT method - No. 30: Western part of Hakkoda area); 1989 nendo chinetsu kaihatsu sokushin chosa. Chinetsu kaihatsu sokushin chosa chijo chosa hokokusho futai shiryo (Denji tansa (MT kan'i ho) hokokusho - No.30 Hakkoda seibu chiiki - 2)

Energy Technology Data Exchange (ETDEWEB)

NONE

1991-01-01

An electromagnetic surveillance using the simplified MT (magnetotelluric) method was conducted to help clarify the geothermal structure in the western part of the Hakkoda area, Aomori Prefecture. The survey covered approximately 60 km{sup 2,} and involved 38 survey points, 3 magnetic field components, 2 electric field components, not less than 10 measuring frequencies in the range of 0.01-125 Hz, and a measuring time of not less than 2 hours. An analysis was performed, with data previously collected at 60 points added to the data collected at the said 38 points. As the result, the resistivity structure in this area was divided into 3 layers of high-low-high as described from the surface to the depth, and the middle layer was further divided into 3 layers of high-middle-low and the bottom layer into 2 layers of high-low. The result conformed though roughly to the result obtained by the electrical logging carried out in the structure boring. In the geothermal zone including the Sukayu hot spa in the southeastern part of this area and along the Jogakura valley, there exist a complicated resistivity structure attributable to geothermal activities and a number of discontinuous lines of resistivity running in the directions of WNW-ESE and N-S. This enabled an inference that there is a deep-seated geothermal source between Odake and Akamizusawa extending eastward from the said geothermal zone. (NEDO)

Fiscal 1998 geothermal development promotion survey. Annex to on-the-ground survey report, geothermal development promotion survey (Part 2. Electromagnetic surveillance using simplified MT method - No. 30: Western part of Hakkoda area); 1989 nendo chinetsu kaihatsu sokushin chosa. Chinetsu kaihatsu sokushin chosa chijo chosa hokokusho futai shiryo (Denji tansa (MT kan'i ho) hokokusho - No.30 Hakkoda seibu chiiki - 2)

Energy Technology Data Exchange (ETDEWEB)

NONE

1991-01-01

An electromagnetic surveillance using the simplified MT (magnetotelluric) method was conducted to help clarify the geothermal structure in the western part of the Hakkoda area, Aomori Prefecture. The survey covered approximately 60 km{sup 2,} and involved 38 survey points, 3 magnetic field components, 2 electric field components, not less than 10 measuring frequencies in the range of 0.01-125 Hz, and a measuring time of not less than 2 hours. An analysis was performed, with data previously collected at 60 points added to the data collected at the said 38 points. As the result, the resistivity structure in this area was divided into 3 layers of high-low-high as described from the surface to the depth, and the middle layer was further divided into 3 layers of high-middle-low and the bottom layer into 2 layers of high-low. The result conformed though roughly to the result obtained by the electrical logging carried out in the structure boring. In the geothermal zone including the Sukayu hot spa in the southeastern part of this area and along the Jogakura valley, there exist a complicated resistivity structure attributable to geothermal activities and a number of discontinuous lines of resistivity running in the directions of WNW-ESE and N-S. This enabled an inference that there is a deep-seated geothermal source between Odake and Akamizusawa extending eastward from the said geothermal zone. (NEDO)

Report on survey for possibility of applying bio-technologies to biomass in fiscal 1999. Aiming at developing a kitchen refuse and waste water treatment and energy production system that can be installed as an ancillary facility of buildings; 1999 nendo biomass eno bio technology oyo kanosei chosa hokokusho. Biru nado no futai setsubi to shite secchi kanona, chukai, haisui nado no shori narabi ni energy seisan system no kaihatsu wo mezashite

Energy Technology Data Exchange (ETDEWEB)

NONE

2000-03-01

This paper describes the survey and discussion on a system to treat microorganisms generated from organic wastes and recover bio-gas energy as an ancillary facility of buildings. The roof of a building is the most suitable location in terms of open space and odor problem, and because the waste liquid after energy recovery can be flown into the city sewage system. Suitable processes for energy recovery are the primary fermentation, followed further by second stage fermentation purposed of reducing BOD. Since rapid enhancement of the efficiency cannot be expected from the present methane fermentation technologies, it is worth discussing to convert the first step from methane fermentation to hydrogen fermentation, for which technological development is indispensable. Permission by the national or local government would be an important condition. Organic wastes treatment systems with different scales may be considered from wastes treatment in each house to treatment of wastes after collection on the whole city basis. Treating wastes with high water content, such as kitchen refuses and human waste is beneficial among organic wastes being collected and treated by local governments. It is beneficial because sorted collection for that purpose can be carried out, and existing incineration systems can be operated more efficiently. (NEDO)

Report on a survey in fiscal 1999. Supplementary survey on research and development of carbon dioxide fixation and effective utilization technologies utilizing bacteria and algae (the survey on feasibility of bio-technologies to create economic effects, such as the biological CO2 fixation technology); 1999 nendo saikin sorui nado riyo nisanka tanso koteika yuko riyo gijutsu kenkyu kaihatsu futai chosa. Keizaiteki koka wo soshutsusuru seibutsuteki CO{sub 2} koteigijutsu nado no biotechnology no kanosei chosa

Energy Technology Data Exchange (ETDEWEB)

NONE

2000-03-01

Bio-technologies including the biological CO2 fixation technology, or the green bio-technologies (GBT) are the technologies indispensable in realizing the change to a resource circulating and environment harmonizing society that accompanies economical growth, or in other words, the 'sustainable development'. In quantifying the feasibility of these technologies, the GBTs that contribute to creating Japan's international competitive power and employment were specified, and an approach to establish the realization target in 2010 was adopted, upon identifying the general condition of the related markets inside and outside the country. The GBT is the technology that makes the best use of Japan's independent strength created by combining the enzyme engineering and fermentation engineering with the 'genome science' (HEART). The targets are to substitute four million kiloliters of petroleum with a resource circulation type energy generated by the bio-technology; apply the bio-technology to about 30% of products and processes produced or used in Japan's chemical industries; and aim at creating markets by using environmental measurement and analysis, treatment of hard-to-decompose substances, and supports on tree planting as the three pillars. A simulation on return on investment in GBT business suggests the effect of promoting PFI. (NEDO)

Report on a survey in fiscal 1999. Supplementary survey on research and development of carbon dioxide fixation and effective utilization technologies utilizing bacteria and algae (the survey on feasibility of bio-technologies to create economic effects, such as the biological CO2 fixation technology); 1999 nendo saikin sorui nado riyo nisanka tanso koteika yuko riyo gijutsu kenkyu kaihatsu futai chosa. Keizaiteki koka wo soshutsusuru seibutsuteki CO{sub 2} koteigijutsu nado no biotechnology no kanosei chosa

Energy Technology Data Exchange (ETDEWEB)

NONE

2000-03-01

Bio-technologies including the biological CO2 fixation technology, or the green bio-technologies (GBT) are the technologies indispensable in realizing the change to a resource circulating and environment harmonizing society that accompanies economical growth, or in other words, the 'sustainable development'. In quantifying the feasibility of these technologies, the GBTs that contribute to creating Japan's international competitive power and employment were specified, and an approach to establish the realization target in 2010 was adopted, upon identifying the general condition of the related markets inside and outside the country. The GBT is the technology that makes the best use of Japan's independent strength created by combining the enzyme engineering and fermentation engineering with the 'genome science' (HEART). The targets are to substitute four million kiloliters of petroleum with a resource circulation type energy generated by the bio-technology; apply the bio-technology to about 30% of products and processes produced or used in Japan's chemical industries; and aim at creating markets by using environmental measurement and analysis, treatment of hard-to-decompose substances, and supports on tree planting as the three pillars. A simulation on return on investment in GBT business suggests the effect of promoting PFI. (NEDO)