WorldWideScience

Sample records for beikoku genshiryoku hatsudensho

  1. Design and construction of Aratani hydroelectric power plant; Aratani suiryoku hatsudensho no sekkei to seko

    Energy Technology Data Exchange (ETDEWEB)

    Kishimoto, S.; Taniuchi, N.; Shoji, I. [Kansai Electric Power Co. Inc., Osaka (Japan)

    1998-09-05

    The power plant of Kansai Electric Power Co., Inc., is a run-off-river type with an available head of 273.6m, a maximum discharge of 5.0m{sup 3}/s, and a maximum output of 11,200kW, and is scheduled to come into service in 1998. The design dispenses with the spillway for reduction in construction cost. The surrounding geological conditions are quite hostile with many active faults. As for the area through which the water channel tunnel runs through, there is a valley named Nara that is a tectonic boundary, located a little upstream of the tunnel middle point. It was afraid there would be water gushing out because the soil cover is so thin as 60m along the boundary making the natural ground itself fragile. A CSA-MT (controlled-source audio-frequency magnetotelluric) exploration was conducted for predicting the volume to gush out and the result was found to agree excellently with the observed value, and the work went on with water draining borings performed as necessity. NATM (New Australian Tunnelling Method) was applied for excavation, and work type C-1, somewhere between work types C and D, was selected out of four work types A, B, C, and D, from the viewpoint of cost performance. Types A and B applicable to hard geological structures occupied only 1% in the whole process of excavation. Although the scheduled monthly progress of 130m was reduced to 100m due to difficulties caused by freshets and crushed fault zones, the tunnel was completed at the end of 1997. 4 refs., 10 figs., 4 tabs.

  2. Problems of adhering organisms in power stations. Hatsudensho ni okeru fuchaku seibutsu no mondai

    Energy Technology Data Exchange (ETDEWEB)

    Sakaguchi, Isamu (Central Research Inst. of Electric Power Industry, Tokyo (Japan))

    1989-01-05

    Much seawater is used in thermal power station in Japan to cool condensers but organisms adhered on the water channel system result many troubles such as increase of flowing resistance, reduction of thermal transfer efficiendy, corrosion or erosion-corrosion of condenser pipes, and cleaning difficulty for periodic inspection. Living organisms range from micro bacteria of 2 mum to oysters and others of about 10cm size. For these reasons, the intake open channel is previously designed to larger size and this margin is called the shellfish allowance. Mussels which adhere most on circulating water channels, are one of Bivalvia, grow to 3-6cm and in maximum case to 9cm in a year. These adhere on the surface base by secreting adhesive disc consisting of byssus. Barnacles are one of Crustacea and their larvas search preferable places as to light, roughness and water flow and can adhere on a place in considerably rapid water flow. Other organisms are bacteria and Hydrozoa. Many problems are caused by these organisms even now. 8 refs., 3 figs., 2 tabs.

  3. Magnetic susceptibility measurements in Yellowstone National Park, USA; Beikoku Yellowstone kokuritsu koen ni okeru genchi jikaritsu sokutei

    Energy Technology Data Exchange (ETDEWEB)

    Okuma, S. [Geological Survey of Japan, Tsukuba (Japan)

    1997-05-27

    For the purpose of interpreting data of the aeromagnetic anomalies in Yellowstone National Park in the U.S.A., in-situ magnetization intensity measurements have been carried out in 1994 and 1995 on geological outcrops of rocks in that area. Comparisons and discussions were given on the measurement results, and existing rock magnetic data and aeromagnetic anomaly data available for the area. Outside the Yellowstone caldera, part of granitic gneisses among the Precambrian granitic gneisses and crystalline schists distributed to the north has an abnormally high magnetization intensity of 1 {times} 10 {sup -2} SI. This could be a powerful anomaly source for the high magnetic anomaly in this area. Paleogene volcanic rocks distributed widely in the eastern part of the park also have magnetization intensity as high as 1 {times} 10 {sup -2} SI or higher, which are also thought a powerful anomaly source in this area. Part of Pleistocene basalts which are exposed partially in the western part of the park has also very high magnetization intensity at 1 {times} 10 {sup -2} SI or higher. This suggests correlation with the magnetic anomaly in the east-west direction distributed in this area. Quaternary rhyolites are more magnetic than Quaternary welded tuffs, which should give greater effects to the magnetic anomaly. 10 refs., 5 figs.

  4. Present situation of the development of petroleum substitution energy (the U.S.); Sekiyu daitai energy kaihatsu no genjo (Beikoku)

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-03-01

    The paper investigates and reports the trend of the development of petroleum substitution energy in the U.S. The Clean Coal Technology Plan is one of the plans which were implemented most successfully in the past several years. The plan made a remarkable reduction in NOx and SOx emissions possible. As for natural gas, importance is placed on improvement of production/storage technology of natural gas and high-effective low-NOx-emission turbines. As to the research on nuclear reactors, importance is now placed on the light water reactor plan, and the target is the design and development of such nuclear reactors as electric power companies pay attention to. The solar cell industry is markedly developing, and the shipment grows 17% per year. However, the price is rapidly declining. The wind turbine and biomass power generation plans are also advanced, and most of the plans are aimed at the development of new fields of application. With regard to geothermal energy, slowness is seen. Concerning electric vehicles, no makers enter into the quantity production, but the research and development are actively being made. 72 refs., 26 figs., 51 tabs.

  5. Silicon babies. ; Front line of artificial intelligence in the U. S. A. Silicon babies. ; Beikoku no jinko chino saizensen

    Energy Technology Data Exchange (ETDEWEB)

    Wallich, P.

    1992-02-01

    The current status is described on artificial intelligence researches in the U.S.A. being carried out by researchers at research companies and universities. The traditional researchers of artificial intelligence believe in the usefulness of inference, learning and symbol processing. They also believe that more excellent machines can be made if more sophisticated algorithms and higher speed hardwares make debuts. On the one hand, young researchers try to design a perfect mechanical organism that moves using the same motion principles as the reflective motions of animals so that they can evade the huge amount of labor that appears rational apparently by some means that they can think of. This paper introduces additionally the results of researches performed by university researchers on the problems in conventional artificial intelligence researches. A large number of researches are under way aiming at producing a machine that has an artificial intelligence capable of expressing human inference and self-consciousness. However, because of the approach taken only on the aspect of intelligence, the current state is such that no capability of even at an insect level has been realized. 4 refs., 6 figs.

  6. On the building of Momoyama hydraulic power station on Kiso river. Kisogawa Momoyama suiryoku hatsudensho no kenchiku ni tsuite

    Energy Technology Data Exchange (ETDEWEB)

    Kotera, T. (Nagoya University, Nagoya (Japan). Faculty of Engineering)

    1991-09-30

    This paper investigates Momoyama hydraulic power station built on the middle reaches of the Kiso River in Uematsu-cho, Kiso-gun, Nagano Prefecture in Japan, in 1923 by relating to the feature of the building of the hydraulic power station and the architect, Shiro Sato. The hydraulic power station originally was a functional and industrial building which puts a priority on the efficiency of business economy, at the same time it was often required to present a beautiful appearance. The building of Momoyama hydraulic power station was founded on the crane girder structure covered with reinforced concrete(RC) walls. A Hat roof of RC slab was applied to the roof of the building. It was generally designed in Neo-Gothic style. More specifically, however, the wall surface was designed in church style and the upper part was like a castle in the middle ages. Therefore the total design was eclectic. The outer surfaces of the building were remained to be bare concrete as cast. Such a multiple building symbolizes the situation of Japanes architecture in the 1920s. 4 figs.

  7. Kurokawa 150-kW wind turbine generator demonstration; 150 kW Kurokawa furyoku hatsudensho ni tsuite

    Energy Technology Data Exchange (ETDEWEB)

    Okamoto, M.; Shinohara, M.; Sugiyama, T. [Kansai Electric Power Co. Inc., Osaka (Japan)

    1996-10-27

    This paper presents the 150kW wind turbine generator erected at a site near Kurokawa dam lake of Kansai Electric Power Co. in Hyogo prefecture. This generator is composed of a horizontal-axis propeller with 3 blades of 27m in diameter and 36/27rpm, and a tower of 30m high. Harmony with the environment was also considered because of the site in a natural park area. Its demonstration test started in Oct. 1996 at annual mean wind velocity of 2m/s. Soft start was realized by controlling inrush current and preventing voltage drop in system interconnection by use of a thyristor circuit. The dual operation system was adopted of a 30kW small generator at lower wind velocity and a 150kW large one at higher velocity. Two kinds of brakes are used, and rotor revolution was reduced by air brake (blade tip spoiler). Mechanical disk brake works for the stopped rotor or emergency stopping. Even if the wind turbine was stopped by exterior factor, if no anomaly of the turbine is found, it automatically re-starts after removal of the factor. The generator is controlled from a remote control station 150km apart through NTT communication line. 6 figs., 2 tabs.

  8. Report on current status of petroleum substituting energy development in the USA in FY 1997; 1997 nendo chosa hokokusho (sekiyu daitai energy kaihatsu no genjo (Beikoku))

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-03-01

    In the last twenty-five years, the level of social recognition for the importance of energy conservation grew progressively from a total nonexistence of concern to the driving force that ensures the future environmental health of the nation and the world. Executive Order 12003, relating to energy policy and conservation, was signed by President Jimmy Carter and dated July 20, 1977. In 1992, President Clinton issued Executive Order 12759 - federal Energy Management. Each agency will prescribe policies under which its industrial facilities in the aggregate increase energy efficiency by at least 20% in fiscal 2000 in comparison to fiscal 1985. Current Federal programs for building efficiency are estimated to result in 31.5 billion dollars in annual energy saving for consumers by 2010. Future trends attract attention. The major programs currently in force to implement these policies and directives include Rebuild America, Million Solar Roofs Initiative, Home Energy Rating Systems, and Weatherization Assistance Program. 37 refs., 1 fig., 6 tabs.

  9. Regulations concerning open access to transmission grid in U.S.. Analysis of order No.888; Beikoku ni okeru open access no hokisei. Order No.888 no kento

    Energy Technology Data Exchange (ETDEWEB)

    Maruyama, M.

    1999-02-01

    Recently, countries aiming at deregulation of the electricity supply industry tend to choose `open access models` that allow final customers the freedom to select suppliers. For example, in 1996, U.S. Federal Energy Regulatory Commission (FERC) issued Order No. 888, which requires electric utilities to open their transmission grid for third parties. However, there are a lot of issues to be addressed before we adopt such models in our country. In this paper, we discuss open access of the transmission grid from the view points of utility regulation, taking account of the debates over regulations on grid access, especially concerning Order No.888 and previous laws and regulations in the United States. The results are: 1. At the end of 1980s, laws and regulations were established to require electric utilities to open their transmission grid for third parties. However, propriety of the wheeling order was decided on a case-by-case basis before the enactment of Order No.888. 2. Under tile provisions of Order No. 888 issued in 1996, electric utilities are required to open their transmission grid any time by request. Nevertheless, that obligation is limitative because (1) the electric utilities have a preferential access to the grid, (2) eligible customers can access to the grid only if there is available transmission capacity. Hence, one of the critical issues to be addressed is how to calculate their available transmission capacity. (author)

  10. Present developmental conditions of petroleum substituting energies in the U.S.A; Sekiyu daitai energy no kaihatsu no genjo (Beikoku)

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-03-01

    The present developmental conditions of petroleum substituting energies in the U.S.A. were surveyed. The budget related to energy saving and petroleum substituting energies in the U.S.A. is on the increase. DOE`s expenditure on petroleum substituting energies increased from $6.8 billion in 1993 to $8.1 billion in 1995 (from 29.6% to 34.6% of DOE`s expenditure), showing the positive approach to development of petroleum substituting energies. Approaches to environmental protection are also in promotion such as positive use of electrical vehicles by U.S. government and emission regulation of specific pollutants by EPA. The state of California withdrew the regulation which prescribes that 2% of passenger cars sold in the state should be zero emission vehicles after 1998, because development of the battery with both sufficient mileage and output is impossible by 1998 in the present stage. The prospect of practical use of new batteries such as lithium battery is still far from certain for some years. Development of petroleum substituting energies in the U.S.A. is still insufficient. 17 refs., 1 fig., 4 tabs.

  11. Impact of transmission open access on power system operation and planning. In reference to U.S. deregulatory case; Soden access ga denryoku keikaku / un`yo ni ataeru eikyo to kadai. Beikoku kisei kanwa jirei wo sanko to shite

    Energy Technology Data Exchange (ETDEWEB)

    Tsukamoto, Y. [The Institute of Energy Economics, Tokyo (Japan)

    1997-05-01

    The U.S. Federal Energy Regulatory Commission (FERC), in its Orders Nos. 888 and 889 published in 1996, ruled a nondiscriminatory open access to transmission lines, which is mandatory at wholesale level, together with sets of regulations concerned therewith. To explain it more specifically, the open access policy obligates all the utilities operators possessing, controlling and operating transmission lines to provide their power sale and buy activities and transmission services to third parties indiscriminately. This obligation is intended to reduce power charges, increase supply reliability, and provide open and fair power transmission service. This signifies that change in social structures is progressing, in which systems will formed under repetition of competition and cooperation rather than priority to the cooperation in a fixed form in all the economic activities, not only in the electric utilities industry. This paper introduces the contents of the FERC`s transmission open access, power supply situation in California, problems connected thereto, and conception of power transmission congestion control. 24 refs., 11 figs., 3 tabs.

  12. Fiscal 1997 technological survey report. Engineer exchange project - coal mine technological field (Advanced coal producing country survey - U.S.A. survey); 1997 nendo gijutsusha koryu jigyo (tanko gijutsu bun'ya) senshin santankoku chosa. Beikoku chosa

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-03-01

    While the introduction and adaptation of the Longwall excavation technology were carried forward for coal producing countries in the Pacific region, U.S.A. information was collected by making tours of coal mines in the West and Washington/Colorado/Utah States, with the intention of ascertaining technological trend so as to carry out efficient technological transfer, and for the purpose of replenishing the contents and contributing to the smooth implementation of the engineer exchange project in 'coal mine technological field'. The coal reserves are 400 billion tons, with 840 million tons produced and with 80 million tons exported; not less than 56% of the U.S. domestic electricity rests on coal. Production by open-pit mining is the majority while the output by underground mining is 38%; the Longwall method has increased as a digging method, taking 18% of all digging output. The productivity is 4.24 ton/person per day and ranks as the world highest. The coal mining technological trend in the U.S. can be summarized as follows. The coal mining output in the West is increasing, with the number of mines decreasing, so that the output per mine is increasing. With the output ratio by open-pit mining increasing, the digging method in the mine is being changed to the Longwall. (NEDO)

  13. Survey report for fiscal 1998. Evaluation by industrial circles of the COP3 outcome and their future response (America); 1998 nendo chosa hokokusho. COP3 no kekka ni taisuru sangyokai no hyoka oyobi kongo no taio ni tsuite (Beikoku)

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1999-03-01

    Response in America to COP3 (Third Session of the Conference of the Parties to the United Nations Framework Convention on Climate Change) is investigated. Office of Energy Efficiency and Renewable Energy (EE) of America's Department of Energy conducts activities designed to protect environments and supports America's economic competitiveness. The scope of EE activities is quite wide, covering efforts at energy efficiency improvement and renewal energy utilization for all energy consuming sectors involving construction work and equipment for buildings, various industries and public utility works, and transportation. EE also supports and promotes the development of advanced industrial materials, electric vehicles, hybrid vehicles, fuel cells, etc. In the field of renewable energy, it deals with the exploitation of sunlight, biomass, wind force, water power, geothermal energy, etc. It also supports efficiency improvement efforts being undertaken through studies of advanced power transmission and distribution, high-temperature superconduction, energy storage, etc. The said supports are provided not only by Federal Government but also by state governments, and include financial aids. A number of programs are under way, worked out and promoted by the respective bureaus and departments. They are evaluated, protected, and implemented through the partnership of official and civilian organizations. (NEDO)

  14. Fiscal 1998 engineer interexchange project (coal mine technology field). Preliminary survey on the international interexchange project in America; 1998 nendo gijutsusha koryu jigyo (tanko gijutsu bun'ya) kokusai koryu jigyo. Jizen chosa (Beikoku)

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1999-03-01

    As a part of the fiscal 1998 international interexchange project in a coal mine technology field, the survey was made in America. Geological engineering problem has large effect on the protection and productivity of underground coal mines. Promotion of long wall mining has contributed to reduction of disasters, however, recently deaths due to roof collapse and wall collapse are on the increase. A roof evaluation technique was developed for adequate selection of mining methods and support design, and its standardization and diffusion are in promotion. Integration and improvement advanced in facility technology because of worldwide integration by acquisition of coal mine facility manufacturers. Introduction of high-power high-capacity facilities is increasing with introduction of large long wall working faces, and development of rear transport system technology and labor saving by remote control are also in promotion according to such trend. As automation and labor saving technology of mining facilities, the automated direction detection and control system by laser and gyroscope is under development. (NEDO)

  15. Development and application of robots for checking and repairing civil engineering facilities in hydraulic power plants. Suiryoku hatsudensho doboku setsubi wo taisho to shita kakushu tenken hoshu robot no kaihatsu to tekiyo

    Energy Technology Data Exchange (ETDEWEB)

    Nakamura, T.; Hibino, Y. (The Tokyo Electric Power Co. Inc., Tokyo (Japan))

    1993-07-25

    Development efforts are being made on robots to improve efficiency in the checking and repairing works that require a great amount of labor at hydraulic power plants. This paper introduces examples of the development and application of these robots. An underwater remotely controlled robot developed based on unmanned submarine boats mounts TV cameras, dives to a depth of 300 meters, and checks underwater structures under control from above the ground. A self-driven waterway investigating system mounting an underground radar equipment investigates tunnel covers and rear cavities, and can acquire continuous data for the cover thickness and cavities without a need of boring. The following robots have obtained satisfactory results in efficiency improvement and accuracy: an unmanned robot for checking inside of a waterway tunnel with small cross section difficult for a man to enter (using a video camera); a video photographing robot to photograph large underground cavities such as surge tanks; and a self-driven robot to visually inspect and photograph steel pipes and measure their thickness. 8 figs., 8 tabs.

  16. Construction of Hidaka Power Station discharge channel. TBM/ECL techniques as applied in countering methane blowing-out; Hidaka hatsudensho hosuiro tunnel no seko. Methane gas yushutsu chiso ni okeru TBM/ECL koho

    Energy Technology Data Exchange (ETDEWEB)

    Yokota, K.; Suzuki, H.; Kasai, H. [Hokkaido University, Sapporo (Japan)

    1998-05-05

    The construction site being located in a coal mining zone, machine excavation not requiring men at the tunnel face or blastings is employed for fear of methane gushing. The method adopted in this work involves TBM (tunnel boring machine), ECL (extruded concrete lining), and continuous belt conveyer, all excellent in terms of safety, workability, construction time, and cost. In this report, explosion-proof facilities are changed when an unexpectedly high rate of methane of not less than 5% is detected upon completion of 917m-long excavation, men are ordered out of the working site in the presence of 0.5% of methane, and electricity likely to cause fires is cut off when methane comes to occupy 1.0%. Horizontal boring is carried out for detecting methane. Although lining and spraying processes are required in the conventional method for preventing gas entrapment in between the support and ground, methane gushing is instantly suppressed in the method used here thanks to lining continuously installed in the TBM rear section. The method being a hermetic air bubble shield method, methane can enter only at the screw conveyer, and such can be effectively diluted by concentrated ventilation at the exit. The continuous belt conveyer is free of friction that may start fires, and the air duct ensures full ventilation for the tunnel. The construction time proves shorter by two months, demonstrating the usefulness of this method. 5 refs., 9 figs., 4 tabs.

  17. Tachibana Bay Electric Power Plant. Design and construction of pipe-laying works on the sea bottom for the industrial water; Tachibanawan hatsudensho. Kogyo yosui kaitei haikan koji no sekkei to seko

    Energy Technology Data Exchange (ETDEWEB)

    Shiono, A.; Tanaka, K. [Shikoku Electric Power Co., Inc., Takamatsu (Japan)

    1997-09-01

    At Kokatsu Island in the Bay of Tachibana, Anan City, Tokushima Prefecture, Tachibana Bay coal burning thermal electric power plants are now under construction. This is a joint venture of Shikoku electric Power Company and Dengen-kaihatsu (Power Resources Development Co.) with the objective of securing power supply in and after the year of 2000. The former plans one 700,000kW generator and the latter plans two 1.05 million kW generators totalling 2.8 million kW in terms of plant capacity. As for the above plants, the industrial water of 14,000m{sup 3} per day is required for various equipment including exhaust gas desulfurizers, etc. and the receiving and sending point of this industrial water is located at Ohgata Area, the northern opposite coast of this island. It is necessary to lay water pipes in the sea area from the above point up to Kokatsu Island, but this sea area lies within the important harbor designated for lanes and anchorages of vessels, hence traffic of vessels is heavy and restrictive conditions are many. Having studied various construction methods, the chain cutter simultaneous laying and burying method has been adopted. Three large calibre submarine water conveyance pipes, each of which is 250mm in inner diameter and about 2km long, have been built and the works have been completed at the end of June, 1997. 12 figs., 3 tabs.

  18. Outline of 3times77.5MW power plants for Malitobog geothermal power plant, Philippines; Philippines Malitobog chinetsu hatsudensho plant (77.5MW times 3 dai) no gaiyo

    Energy Technology Data Exchange (ETDEWEB)

    Ochiai, K.; Tanaka, N. [Fuji Electric Co. Ltd., Tokyo (Japan)

    1998-09-15

    Fuji Electric has constructed 3 geothermal power plants (77.5MW at each unit) in Leyte, the Philippines, and delivered them to the customer, Visayas Geothermal Power Company. This paper outlines these geothermal plants. They are installed in a mountainous area, approximately 600m above seal level, and approximately 132km to the southwest of City of Tacloban, the capital of Leyte and 530km to the southeast of Manila. The overall system has 20 production wells and 19 injection wells, each approximately 2,000 to 3,000m deep, with hot water predominant in the steam wells. Each of the 77.5MW turbines is of a single cylinder, 2 stream exhaust type, with a 658mm wide, low-pressure blade. The erosion-preventive measures include removal of drain, dispersion of droplets and reduction of impact by accelerated droplets and stellite shield, and the corrosion-preventive measures include selection of adequate materials, determination of adequate design stresses and padding of stainless steel for static blade holders. Hydrogen sulfide is removed by decomposing it into elementary sulfur. The plants have been in service since May, 1998. 4 refs., 16 figs., 3 tabs.

  19. Study on wind turbine for Yamagata wind energy institute. Comparison of the actual and estimate values for electric power; Yamagata furyoku hatsudensho no fusha ni tsuite. Hatsudenryo yosoku to jissekichi no hikaku

    Energy Technology Data Exchange (ETDEWEB)

    Nagai, H. [Nihon University, Tokyo (Japan); Kojima, T. [Yamagata Wind Energy Institute, Yamagata (Japan)

    1996-10-27

    For two 400kW wind turbines erected in Jan. 1996 of Yamagata Wind Energy Institute, their estimated power output was compared with actual output for 7 months. AMeDAS data in 1985-94 were totaled every month to use as basic data. The altitude and surface roughness model necessary for WAsP analysis recommended by NEDO`s wind condition close inspection manual were prepared using 1/25,000 maps and aerial photographs. The obstacle model for estimating wind conditions at height of the wind turbine was prepared using the data obtained by field survey. Mean wind velocity and latent energy were determined by statistical analysis of wind velocity occurrence relative frequencies and Weibull distribution parameters. The power output of 717,700kWh was obtained for 7 months, which is equivalent to 88.5% of the estimated output of 810,730kWh for the same period. It was clarified from obtained characteristic wind conditions at the site that the wind power generation is promising at the site not only in winter but also in summer. Although the test period was too short, this method was effective as analytical method of output estimation in the planning stage of wind turbines. 3 refs., 8 figs., 4 tabs.

  20. Haramachi Thermal Power Plant design and works of marine independent drainage and buried continuous wall shaft; Haramachi Kryoku Hatsudensho kaijo dokuritsugata hosuiko to chichu renzokuheki tateko no sekkei/seko

    Energy Technology Data Exchange (ETDEWEB)

    Takashima, N.; Sato, S. [Tohoku Electric Power Co. Ltd., Sendai (Japan)

    1996-03-05

    For the drainage of condenser cooling water watercourse of the power generator No.1 and No.2 of Haramachi thermal power plant, a submarine tunnel system was adopted in the consideration of geological character around the plant, economy, and relation to the other civil works. The undersea drainage system was adopted since it gave the least effect on the environment. The water course shaft is located just below the drain outlet. The shaft wall was constructed according to the buried continuous wall work method, and the buried continuous wall that was adopted to drill its inside. The design and works of special works such as marine independent drainage and buried continuous wall shaft were described. The outline of novel techniques adopted in the works were also reported. The novel techniques are: (1) Improvement in work efficiency and horizontal accuracy by adopting the torsion measurement equipment, (2) Stabilization of drilling work by adopting the PHPA stabilizer liquid (copolymer of acrylamide and acrylic acid), and (3) Reduction of waste volume by using the flocculant in the effluent treatment process. 7 refs., 13 figs., 7 tabs.

  1. Strength of roadbeds built of solidified coal ash or foamed asphalt. Application thereof to temporary roads for construction work in Tachibanawan power plant site; Sekitanbai kokatai roban to formed asphalt roban no kyodo tokusei. Tachibanawan hatsudensho konai kari doro eno tekiyo jirei to hyoka

    Energy Technology Data Exchange (ETDEWEB)

    Suesawa, H.; Iwahara, H.; Isakura, M. [Shikoku Electric Power Co., Inc., Kagawa (Japan)

    1998-11-05

    For the construction of a solidified coal ash roadbed, desulfurized gypsum and a small amount of slaked lime are added to coal ash that is the main material, moisture is adjusted, the resultant moist powder is mixed in a screw-type mixer and transported aboard a dump truck to the construction site, and then solidified by rollers. The material is easy to install, and the roadbed is high in serviceability. With no serious damage occurring in the paved surface for nine months after the placement, the road keeps on functioning satisfactorily as a provisional road for use in the execution of the construction work. Foamed asphalt is prepared by adding water to asphalt in the liquid state at high temperature for the formation of fine foam for a 10-15 times expansion of the asphalt volume. Such asphalt is lower in surface tension and enhanced in adhesiveness to other materials, and mixes completely with the road materials at normal temperature for the construction of a reinforced roadbed. The foamed asphalt covers only fine aggregate but not coarse aggregate, and the latter is tightly solidified by bitumen etc. by tamping for the realization of a strong structure. Foamed asphalt is a material that works effectively when used for a road where dynamic load is dominant. 8 refs., 18 figs., 7 tabs.

  2. Design and engineering of west-side revetment for Tachibana Bay Power Station. Swelling behavior of sand compaction pile improved ground and mechanical properties of composite ground; Tachibanawan hatsudensho Nishigogan koji no sekkei to seko. Sand compaction pile kairyo jiban no moriagari kyodo to fukugo jiban no rikigaku tokusei

    Energy Technology Data Exchange (ETDEWEB)

    Kameda, S.; Hara, J.; Ozaki, S. [Shikoku Electric Power Co., Inc., Kagawa (Japan)

    1997-07-05

    This report covers a sand compaction pile (SCP) process performed for the improvement of the sea bottom along the west-side revetment of the power station where a 10-odd meter thick sedimentary layer of soft clayey soil exists. Since the sea is only 5m deep in this area, an engineering method is chosen capable of minimizing the swelling of the ground, and changes in the physical properties of the composite ground that may affect the stability of the revetment are investigated. In this report, an estimating equation is proposed for accurately predicting the swelling, including the additional swelling of the ground already swollen, to result from the SCP-assisted improvement of the ground and a description is given of changes in composite ground mechanical properties induced by the SCP-assisted engineering work. A `one-directional construction system with one block constituted of three spans` is contrived. Furthermore, an estimating technique taking into account the secondary swelling is proposed. As the result, the apparent swelling rate agrees very well with the actual swelling rate. An SCP method with its capability enhanced may be established by considering time-dependent changes in the mechanical properties of the clayey soil between piles and their impact on the safety factor. 4 refs., 13 figs., 3 tabs.

  3. Research report of FY 1997 on the environmentally acceptable coal utilization system introduction support project. Follow-up project on circulating fluidized bed boiler introduction (Calaca Batangas Thermal Power Station); 1997 nendo chosa hokokusho. Kankyo chowagata sekitan riyo system donyu shien jigyo (junkan ryudosho boiler ni kakawaru follow up jigyo (Calaca Batangas karyoku hatsudensho))

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-03-01

    For the follow-up project, to promote the diffusion of results of the clean coal technology (CCT) model projects, experts of circulating fluidized bed boilers were dispatched, to guide and advise for the operation of facilities introduced in these projects. The purpose of these projects is to diffuse the CCTs, and to support the promotion of environmental measures. Some guidance and advice about operation processes, data processing, operation regulation, maintenance, and boiler maintenance works were provided to the Ministry of Energy and Electric Power Corporation of the Philippines. Semirara, Malangas, and Samar coals in the Philippines were used for the tests. The boiler facilities could be operated by Philippine operators themselves. Based on the guidance and advice about operation processes, combustion tests using various Philippine coals were also planned and conducted by themselves. The maintenance techniques were transferred to Philippine operators through the inspection, repair and advice. The Philippine side understood the technologies well, and the circulating fluidized bed boiler technology was independently educated in the Philippines. 23 figs., 16 tabs.