深基坑环形支撑体系施工技术

Foundation Excavation Construction Technology of the Ring Support System

南京某工程位于深厚的长江漫滩软土层中,土质条件差,根据周边环境及开挖深度,采用钻孔灌注桩加2层环形钢筋混凝土支撑、双轴深搅桩止水的支护形式。工程实践与监测资料表明:环形内支撑系统具有结构合理稳固、支撑形式新颖安全、施工空间大、便于挖运土、节省工程造价等诸多优点,是一种在深大不规则基坑中值得选用的支撑体系,值得总结和推广应用。

Some project in Nanjing is located in the deep of Yangtze River backswamp soft soil with poor conditions,according to the surrounding environment and the depth of excavation,method of bored piles with two layers of circular reinforced concrete support,biaxial deep mixing pile water retaining structure was adopted. The engineering practice and the monitoring data shows that the annular inner support system has the advantages of reasonable structure,stable support new forms of security,construction space,easy to dig earth,save engineering cost advantages,is a worthy of the supporting system in deep irregular foundation pit,is worthy of promotion and application.