耐爆シェルター構造とシンガポール特有条件下での地下鉄建設: ダウンタウン線ベドック•ノース駅ェ区，マター駅ェ区，ベンクーレン駅ェ区

摘要

2011年から開始したシンガポール地下鉄の第5の路線（ダウ夕ウン線）の3期工事は，2016年末にほぼ完成しており， 現在，地下鉄運行に向けて準備中である.シンガポールは，狭い国土にもかかわらずその地下は，多様な地盤が複雑に 入り組んでいるため，地下建設工事では想定外の事象に遭遇することが多い.今回報告する駅工事は，有事を想定した CD(Civil Defense:耐爆シェル夕ー仕様)構造という日本にはない設計思想と，巨大な転石が介在する土質条件の深さ 43mの大深度での施工である.さらに，トンネル工事に関してはシンガポール特有の土質条件のもとでのシールドトン ネルを施工した.%Structure of Civil Defense Shelter and Subway Construction under Singapore's Unique Conditions-Bedok North Station, Matar Station, and Bencoolen Station for Singapore MRT Downtown Line Project- Construction began on the fifth line of the Singapore MRT(the Downtown Line) in 2011. Its stage 3 was mostly completed by the end of 2016， and preparations are currently underway for the launch of subway operation. Singapore is a small but the ground consists of complex mix soil types, so unexpected difficulties are often encountered during underground construction. The station construction covered in this report included civil defense shelter structures for use in the event of an emergency, a design concept which does not exist in Japan, as well as construction at a depth of 43 meters in ground containing massive boulders. Shield tunnel was build under Singapore's unique soil conditions.