海底横断ガス導管シールドをURUP工法により地上発進: 東邦ガス 緑浜第二吐出線

摘要

東邦ガス（株）は，今後発生が予想される大規模地震に備え，ガスの安定供給が図れるよう構造の異なる予備ガス導管の建設を進めている.本事業は，東邦ガス（株)知多緑浜工場と知多LNG(株)共同基地とを結ぶ連絡配管橋の予備ルートとして，工場と基地間の地中部および海底部に連絡ガス導管敷設用のシールドトンネル（内径φ1.800mm）を構築するものである.本稿では，海底横断トンネルにシールドの地上からの発進，地上への到達を実現する「URUP工法」を採用した施工事例について報告する.%Toho Gas Co., Ltd. has promoted the construction of backup gas pipelines with different structures in order to maintain stable supplies of gas in preparation for large-scale earthquakes that have been predicted to occur in the future. This project is constructing a shield tunnel (1,800mm in diameter) under the seabed that connects the plant and the base and contains a connecting gas pipeline. The pipeline will work as backup route of the connecting pipeline bridge which links the Toho Gas Chita Midori-hama plant with the Chita LNG Co., Ltd. This report contains information on construction case in which the URUP method was used for undersea shield tunnel that allows launch from ground and arrival to ground.