報告書番号

W03

タイトル（和文）

配電池中下新技術－建設コストの低減

タイトル（英文）

ADVANCED TECHNOLOGY FOR UNDERGROUND POWER DISTRIBUTION SYSTEM-REDUCTION OF CONSTRUCTION COST-

概要 （図表や脚注は「報告書全文」に掲載しております）

配電地中化の建設費は架空配電の１０～１５倍を要することから，その低減が重要かつ緊急の課題となっている。この配電地中化建設コストの半減を目標として，土木工事，機材および地中化工事の各面から技術開発を行い次のようにほぼ目標を達する成果を得た。（１）歩道下でのケーブルの埋設深さは土木，電気両面から検討を加えた結果３０ｃｍ程度まで浅層化可能である。これにより，土木費を半減できる。（２）地下孔建設時の土留め壁を本体壁に兼することによりコスト低減できる。（３）地中埋設変圧器にヒートパイプを適用して熱放散を向上した。これにより変圧器とその収納ハンドホールを大幅に小型できる。これらにより，地中変圧器と付帯工事費をは半減できる。（４）その他，埋設物自動探査法，発生土再生利用技術など土木技術，短絡電流抑制技術，機器の柱上設置方式の景観設計手法などの機材関係技術および合理的地中化計画プログラムを開発した。

概要 （英文）

IN JAPAN,CONSTRUCTION OF UNDERGROUND DISTRIBUTION SYSTEM INCREASES RECENTLY IN URBAN AREA IN ORDER IMPROVE THE AMENITY OF THAT AREA AND TO MAKE REFUGE EASY AT THE CRISIS. THE INSTALLATION AND CONSTRUCTION COSTS OF UNDERGROUND DISTRIBUTION SYSTEM ARE ABOUT FIFTEEN TIMES HIGHER THAN THAT OF OVERHEAD ONE. THEREFORE,DEVELOPMENT OFVARIOUS TECHNOLOGIES ARE STUDIED IN ORDER TO REDUCE THE COST OF UNDERGROUND DISTRIBUTION SYSTEM. THE GOAL OF THIS RESEARCH IS TO INTRODUCE VARIOUS COST REDUCTION METHOD FROM THE POINT OF VIEW OF CIVIL,ELECTRICAL AND PLANNING ENGINEERINGS AND TO DEMONSTRATE THEIR APPLICIBILITY. THIS PAPER DESCRIBES THE RESULTS OF THEESE COST REDUCTION RESERCHES AND COSTEVALUATION OF THESE NEW TECHNOLOGIES. THE SUMMARIES OF THE RESULTS AREAS FOLLOWS; 1) LABORATORY AND FIELD STUDIES ON MECHANICAL STRENGTH FORTHE CABLE PROTECTION TUBE AND ALLOWABLE CURRENT OF THE CABLES HAVE SHOWED THAT BURYING DEPTH WHICH IS USUALLY 120CM,IS ABLE TO REDUCE AT A SHALLOW DEPTH UP TO 30 CM UNDER SIDEWALK PAVEMENTS.2) INVESTIGATION ON THE EXCAVATED SOIL IN ACTUAL CABLE INSTALLATION SITES IN TOKYO AREA HAS INDICATED THAT MORE THAN 80% OF THAT SOIL ARE SO CALLED GOOD QUALITY SANDS AND THEY CAN USE FOR THE BACKFILL.3) THE UNDERGROUND RADAR TECHNIQUEHAS BEEN APPLIED TO SEARCH FOR PREVIONSLY BURIED PIPES. THE DISELOSINGCAPABILITIES AND LIMITS OF THIS RADAR SYSTEM ARE INVESTIGATED,AND ANOTHER BORE HOLE RADAR METHOD IS PROPOSED IN ORDER TO DISCLOSE THE UPPER AND LOWER PIPES.4) VARIOUS STUDIES TO RATIONALIZE DESIGN AND CONSTRUCTION METHOD FOR MAN-HOLE IN ORDER TO REDUCE EXCAVATION IS STUDIED AND INDICATES 20% COST REDUCTION.5) HEAT PIPE IS APPLIED TO IMPROVE HEAT RADIATION FROM UNDERGROUND TRANSFORMER AND TO REDUCE SIZE OF THE TRANSFORMER.HEAT PIPE CONNECTOR WHICH CONNECTS THE HEAT ABSORPTION PART IMMEROED IN TRANSFORMER OIL AND RADIATION PORT BURIED UNDERGROUND,IS DEVELOPED AND GIVES WELL WORKABILITY AND HIGH RELIABILITY OF HEAT PIPE SYSTEM.

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