富水条件下盖挖逆作地铁车站中间柱施工技术

Fabricating the Intermediate Column of a Subway Station Constructed by Top-down Covered Excavation in Water-soaked Ground

论述盖挖逆作法施工地铁车站,中间柱施工是一道十分关键的工序,一旦柱位出现偏差,很难采取补救措施。介绍南京地铁新街口站采用的一整套完整的施工工法,即将可倒用的钢套管作为隔水工具,形成地下操作空间,采用具有自动导向的定位器,精确完成钢管柱安装及杯口砼的浇注。

In the top-down covered excavation for building a subway station, the intermediate column fabrication is the extremely essential working procedure. Once deviation of the column Position occurs, it is very difficult to adopt remedial measures. This article introduces the complete construction procedure adopted in Nanjing Xinjiekou Subway Station. A steel thimble was adopted to separate the water and form the underground operation space. A pre-computed course locator was employed to complete the steel-pipe column installation and the concrete fabrication through the cup mouth.