城市管群下超浅埋大断面平顶直墙暗挖施工技术

Construction Technology for Ultra-shallow Flat-top Large Section Vertical Wall Subsurface Excavation Under City Pipe-group

以北京地铁四号线石榴庄路站1号风道为例,介绍在超浅埋大断面平顶直墙暗施工中采用多导洞开挖的施工方案,并结合微台阶法及多种支护措施达到控制地表和地下管线群沉降的目的,总结了超浅埋平顶直墙暗挖施工的关键技术。

For the No.1 duct of Shiliuzhuang Station on 4th Line of Beijing Metro as an example,the author show construction scheme of multi-guiding hole excavation in ultra-shallow flat-top large-section vertical wall construction.Combing with several supporting measures and micro bench method,settlements of ground and underground pipe-group are controlled.The author sums up the key technology of ultra-shallow flat-top vertical wall subsurface excavation construction.