構造と施工方法の変更でJES函体工期を半減: 奥羽本線 新青森こ道橋

摘要

These works were conducted to construct a road that passes under a railway line with trenchless technique. The cross-section of tunnel was designed as one story, two spans with two lanes and a footway on each span. The tunnel has a total width of 28.1 m and a total height of 8.29 m.rnBefore the tunnel construction, we changed the box structure from four to two spans and employed the method of jacking the members of box from both shafts across the railway embankment, to create efficient works and to shorten the period.%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.断面は，片側2車線・両側歩道を有する1層2径間で全幅28.1m，全高8.29mである.函体の構築では，函体の構造形式を4径問から2径間に変更するとともに，線路を挟んだ両側の立坑からエレメントをけん引する方ラ車を採用し.効率的な施工に取組んで工期短縮を図った.