近河道深基坑内微承压水降排水施工技术

Construction Technology of Micro Artesian Water Drainage in Deep Foundation Pit Near Watercourse

某项目距离河道约500 m,且电梯基坑底部标高为-14.01 m,该基坑微承压水头标高为-11.26 m,基坑开挖时坑底微承压水不断上涌,影响建筑防水及底板结构施工。该文从潜水泵排水的施工技术原理、施工工艺及注意事项等方面对此项施工技术进行了分析阐述,通过节点深化设计、方案优化和施工质量控制,确保了该施工的顺利实施,取得了良好的社会经济效益。

A project is about 500 m away from the watercourse.The elevation of the bottom of the elevator foundation pit is-14.01 m while that the micro artesian water head of the foundation pit is-11.26 m.During the excavation of the foundation pit,the micro artesian water at the bottom of the pit keeps rising,which affects the construction of building waterproofing and bottom slab structure.This paper analyzed this construction from the principle,construction technology and cautions of submerged pump drainage to guarantee smooth implementation of this construction technology and obtain good social and economic benefits by node deepening design,program optimization and construction quality control.