钢套箱技术在轨道交通车站基坑集水坑和下翻梁施工中的应用

Application of Steel Sleeve Box Technology in Construction of Catchment Pit & Downward Overturn-Beam of Foundation Pit of Rail Transit Station

以南昌市轨道交通L2南昌火车站站南侧附属基坑开挖项目为例,探讨在围护结构的止水帷幕失效情况下,解决流砂地质条件下开挖集水坑和下翻梁困难的问题。局部降水+钢套箱技术是基坑开挖方案之一,通过打入钢套箱及局部降水,成功解决开挖集水坑和下翻梁的难题。所总结的经验对后续类似工程施工起到借鉴作用。

Taking the excavation project of foundation pit attached to the south side of L2Nanchang Railway Station of Nanchang rail transit as an example,this paper discusses how to solve the difficulty of excavating catchment pit and turning down beam under quicksand geological conditions when the water-stop curtain of enclosure structure fails.Local dewatering+steel sleeve box technology is one of the excavation schemes of foundation pit.Through penetrating steel sleeve box and local dewatering,the difficulties of excavating catchment pit and turning down beam are successfully solved.The experience summarized can be used for reference in the construction of similar projects.