大面积环状基坑降水设计与施工技术

DEWATERING DESIGN AND CONSTRUCTION TECHNIQUE OF LARGE ANNULAR FOUNDATION PIT

针对沧州地区地下水位高、水量丰富的特点,根据现场工程环状基坑降水面积大、径向宽度大的条件,对环状基坑采用大口径管井降水,采用截取计算单元进行设计,考虑综合因素及相邻工程施工经验,采取内环、中环、外环三圈布置降水井。通过对防水工程的深化设计、优化方案,确保了降水效果,同时降低了工程降水成本,效果显著。

Considering high underground water level and abundant underground water resource in Cangzhou City, large diameter tube well dewatering technique is adopted in the annular foundation pit in which the dewatering area is large and whose radial width is large. The design is carried out by intercepting computing element. With references to overall factors and construction experiences of adjacent projects, the dewatering well is arranged in three rings, including internal ring, middle ring and external ring. Dewatering effect is successfully ensured and engineering dewatering cost is obviously reduced through in-depth design and optimization of waterproof work.