鉄道盛土法面形状に合わせたアンダーパスの施工: 常磐線熊川こ道橋新設

摘要

The construction works at Kumagawa between Yonomori and Onoma on the Joban Line are to construct an underpass (crossing length = approximately 15.0m, lane width = 3.0m×2) using the HEP and JES methods, along with road improvement works on town road east no. 67 in Okuma-machi, Fukushima Prefecture. These worksrnwere originally planned to conduct construction of the shafts in embankment on both sides of the tracks but, as the site concerned is a high embankment section of approximately 9m, and from the fact that the hearting ground was in a satisfactory state, this was changed to construction utilizing the embankment and omitting many of the temporary retaining walls. As this was the first time that this type of structure was used in actual construction, investigations were conducted satisfactorily before design and construction and, as a result of this, the construction was completed without problem in October of last year.rnThis report gives information on the planning for this construction and the results of actual construction, etc.%常磐線夜ノ森・大野間熊川こ道橋新設工事は，福島県大熊町町道東67号緑道路改良工事に伴い，こ道橋（横断延長L=rn約15.0m，車道幅員W=3.0m×2）をHEP&JES工法により新設するものである．本工事は当初，立坑を線路両側に構築rnして施工を行う計画であったが，当該箇所が約9mの高盛土区間であることや，支持地盤が良好であることなどから，rn盛土を活かし仮土留めを大幅に省略する構造へ変更した．本構造は今回初めて実施工へ導入するものであったため，設rn計・施工に際しては事前に十分な検討を行い，その結果，昨年10月に無事工事を完了している．rn本稿では，本工事の計画および実施工結果などについて報告する．