全国初の大深度法を適用したシールド工事: 神戸市水道局 大容量送水管(奥平野工区)

摘要

The high capacity water main project that the Kobe City Waterworks Bureau has put in place is to build 12.8 km stretch of multi-functional underground water main from the boundary with Ashiya City to Okuhirano Water Purification Plant in order to disperse risk at the time of disasters/accidents, to provide for emergency water supply and early recovery of water supply system through equipping high seismic capacity and to use as an alternative route during restructuring existing water line. These works were carried out on a 2.4 km stretch of the above project from Nunobiki Shaft to Okuhirano Water Purification Plant and were the nation's first application of the Law on Special Measures for the Public Use of the Deep Underground (commonly known as the Deep Underground Law). This report contains information on the application of the Deep Underground Law, the construction plan and construction results.%神戸市水道局が進める大容量送水管整備事業は，芦屋市との巿境から奥平野浄水場までの延長12.8kmにおいて，災害•事故時の危険を分散し，高い耐震性と大きな貯留能力を備えることにより，応急給水や早期復旧が可能となるほか，既設送水トンネルを更生する際の代替ルートとして利用することができる多機能な水道管を築造するものである.このうち，布引立坑から奥平野浄水場までの2.4km区間において，全国で初めて「大深度地下の公共的使用に関する特別措置法」（通称：大深度地下使用法）が適用された.本稿では，大深度地下使用法の適用および施工計画，施工実績を報告する.