深基坑滑降式快速预支撑体系施工工艺研究及应用

Research and Application on Construction Technology of Sliding Type Rapid Pre-Support System for Deep Foundation Pit

摘要: 随着城市经济的发展，交通系统的压力与日俱增，土地资源日趋紧张，对地下空间的开发成为大势所趋。随着开发深度不断增加，控制软土地区密集城区中的环境变形，成为地下工程一个迫切而重要的研究课题。在上海轨道交通市域线机场联络线华泾站车站基坑施工中，创新性地引入了滑降式快速预支撑体系，成功将基坑开挖阶段围护结构变形减小了20%。文章将对该体系的原理和施工工艺进行详细介绍，以期对后续类似工程起到借鉴引导作用。

Abstract: With the development of urban economy, the pressure of transportation system is increasing day by day, and the land resources are becoming increasingly tight, so the development of underground space has become the general trend. With the development depth increasing, it is an urgent and important research topic to control the environmental deformation in dense urban areas in soft soil area. In the foundation pit construction of Huajing station of Shanghai rail transit airport connection line, the sliding type rapid pre-support system was innovatively introduced, which successfully reduced the deformation of retaining structure by 20% in the stage of foundation pit excavation. This paper will introduce the principle and construction technology of the system in detail, in order to play a role of reference and guidance for the subsequent similar projects.