地铁换乘区域工程中的超深地下连续墙套铣工艺研究

Study on Sleeve Milling Process for Ultra-Deep Underground Continuous Wall in Subway Transfer Area Project

以上海轨道交通14号线昌邑路站施工为研究背景,对地铁换乘段深66.5 m的超深地下连续墙局部高压旋喷加固工艺参数、泥浆性能参数调整、铣槽工艺等进行了分析研究,并针对地下连续墙深、厚,地层复杂等特点,采用了"套铣"工艺施工。其中,为确保一期墙在(7)层土层中的垂直度控制,提高施工效率,避免槽壁长时间浸泡而出现坍塌现象,决定对一期槽采用"抓铣结合"工艺施工,达到了设计要求和工期目标。

Taking the construction of Changyi Road Station of Shanghai Rail Transit Line 14 as the research background,the adjustment of technological parameters of partial high pressure rotary jet grouting reinforcement and slurry performance parameters and milling groove technology of 66.5 m ultra-deep underground continuous wall in subway transfer section are analyzed and studied.Aiming at the characteristics of underground continuous wall such as deep,thick and complicated stratum,etc.,the sleeve milling process is used for construction.In order to ensure the verticality control of the first stage wall in the⑦layer soil,improve the construction efficiency,and avoid the collapse of the groove wall due to long immersion,it is decided to use the"grabbing-milling combined"process for the groove wall construction,which achieves the design requirements and the construction period objectives.