地铁车站浅埋暗挖大跨扁平连拱隧道施工综合技术

Comprehensive construction technology of large-span flat double-arch tunnel using shallow excavation method in metro station

成都博览城综合交通枢纽为4条地铁形成的“H”形大型综合换乘枢纽,18号线南端折返线下穿青岛路市政公路隧道。为保证施工期间青岛路的正常通行,采用浅埋暗挖大跨扁平连拱隧道结构形式,通过双侧壁+中导坑十步微台阶法施工,采取地层注浆、超前长管棚等地层加固技术,确保隧道施工安全。

The Chengdu Expo City comprehensive transportation hub is a large"H"shaped comprehensive transfer hub formed by four subways.The southern turn line of line 18 passes through the Qingdao Road municipal highway tunnel.In order to ensure the normal passage of Qingdao Road during the construction period,it adopts the structure form of a large-span flat double-arch tunnel which is constructed by shallow excavation method,and uses the double sidewall+central pit guide 10 steps micro benching tunnelling method and the stratum reinforcement technology such as grouting and leading long steel pipeline roof to ensure the safety of tunnel construction.