大型钢筋混凝土圆环桁架支撑系统应用研究

Study of Large-scale Reinforcement Loop Truss Support System

上海市绿洲中环中心工程,圆形基坑直径达210m,围护体采用钻孔灌注桩+深层搅拌桩,坑内采用2道圆环钢筋混凝土桁架水平支撑。通过采用井点降水与坑底盲沟排水相结合,分层、分块、平面流水与立体交叉施工等措施,保证了大型基坑工程地下空间开挖的顺利进行。

In the main part of Shanghai L＇tizhou Zhonghuan project, the diameter of the foundation pit is 210m, and the support system is bored piles combining deep mixing piles. There are two loop reinforcement trusses used as horizontal support in foundation pit. By taking some measures, the excavation of the foundation pit are successful. Those measures are dewatered by wells combining blind drainage, delaminafion, blocking, planar flow production and spatial crossed construction.