JESと鋼板挿入工法の組み合わせによるアンダーパスの急速施工: 東北本線　太平寺こ道橋

摘要

These works are to construct a road that crosses beneath a railway line using the trenchless method. The cross-section is composed on one story and four spans with two street sections and two sidewalk sections. The construction method for the box structure jointly used differing trenchless methods for the street and sidewalkrnsections and construction was conducted safely and efficiently.rnRapid construction using HEP & JES methods was implemented in the construction of the street section and, in this construction, due to a review of machine equipment (excavation equipment, muck discharge equipment) and conducting prevention measures for track deformation, there was improvement in the traction speed of upper elements.rnThe construction of the sidewalk section was conducted efficiently using the COMPASS method. Further, in the construction, we were creative with methods and the construction of the box was carried out with methods that differed from what was conventional.%本工事は，鉄道線路直下を横断する道路を非開削工法により構築するものである．断面構成は，片側2車線の車道部とその両側に歩道部を有する1層4径間である．函体の構築は，車道部と歩道部で異なる非開削工法を併用した施工方法とし，安全かつ効率的な施工を行った．rn車道部の施工には，HEP&JES工法を用いた高速施工を実施し，高速施工では，機械設備〔掘削設備，掘削土の搬出設備）の検討，軌道変状対策を行うことにより，上床エレメントのけん引速度の向上を図った．rn歩道部の施工には，COMPASS工法を用いた効率的な施工を行った．また，歩道部の施工においては，施工方法を工夫し，従来とは異なる方法により函体構築を行った．