附属结构与主体结构连接处基坑支撑转换技术

On the Support-Converting Technique for Foundation Pits at the Joint of Subsidiary Structures and the Structure of the Main Body

地铁车站建设过程中,附属结构附着在车站主体两边,附属结构在主体结构之后施工,致使附属结构基坑内支撑作用于主体围护结构。在地铁出入口位置,主体结构与附属结构之间存在后浇带,附属结构施工及主体结构地铁出入口位置地下连续墙的拆除需进行基坑支护体系受力转换。介绍了基坑换撑施工工艺,解决了主体结构拆除时的基坑受力转换。实践证明,换撑工艺施工方便,安全可靠。

As the subsidiary structures are to be built after the completion of the structure of the main body, and have to be attached to the both sides of the main body of the metro station in the process of the construction of the station,the internal supports of the foundation pits of the subsidiary structures are made to act on the retaining structure of the main body. At both the exit and entrance of the metro station, there will be a delayed cast belt, the underground continuous wall for the construction of the subsidiary structures and the structure of the main body at both the entrance and exit of the metro station has to be removed when the force transformation for the supporting system of the foundation pits has to performed. Introduced in the present paper is the construction process for changing the supports of the foundation pits, which solves the force transformation of the foundation pits when the structure of the main body is removed. Practice shows that the support-changing process is simple in construction, secure and reliable.