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广州市轨道交通三号线市桥站是广州市地铁工程的主要车站,其主体结构基坑深达17.8m。经勘察发现此基坑为软土深基坑,因此深基坑的变形控制是工程施工的重点和难点。事前经过精心策划,过程中严格控制,及时调整控制手段,使基坑变形得到控制。特别是在A8弧形楼段,经测算,A8弧形楼段的沉降量不能超过40mm。因此及时的在A8弧形楼南、北方向各30m的基坑段底部增加了一排内支撑,确保了基坑及周边建筑物的安全。
Guangzhou Metro Line 3 Shiqiao Station is the main station of Guangzhou Metro Project, and its main structural foundation pit is as deep as 17.8m. After investigation, it is found that the foundation pit is a deep foundation pit of soft soil. Therefore, deformation control of deep foundation pit is the key and difficult point of construction. After careful planning in advance, the process of strict control, timely adjustment of control measures, deformation of the pit to be controlled. Especially in the A8 arc segment, it is estimated that the settlement of A8 arc segment can not exceed 40mm. Therefore, a series of inner supports are added to the bottom of the pit section of 30m each in the south and north of the arc of A8 in time to ensure the safety of the foundation pit and the surrounding buildings.