明挖基坑坑内承压降水井封堵施工技术

The Construction Technology of Plugging Pressure-bearing Dewatering Well in Open Cut Foundation Pit

当明挖基坑坑内的降水井内存在承压地下水时,在停止降水后地下水在很短时间内涌出,所以必须在持续降水的工作状态下,对降水井进行封堵。本文基于成都地铁5号线一二期工程杜家碾站,对封堵基坑坑内承压降水井封堵的一些做法,较好地克服了承压降水井在停止降水后地下水快速涌出的问题,并且封堵的防水质量可靠。

When confined groundwater exists in dewatering wells in open excavation pits,groundwater gushes out in a very short time after stopping dewatering,so the dewatering wells must be blocked under the condition of continuous dewatering.Based on Dujianian Station,the first and second phases of Chengdu Metro Line 5,some methods of sealing pressure-bearing dewatering wells in pits of foundation pits have better overcome the problem of rapid outflow of groundwater after stopping dewatering,and the quality of sealing water is reliable.