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四川甘孜州九龙县斜卡水电站深厚覆盖层中采用常规方法施工降水井时,易出现井壁垮塌、漏浆、成孔工效低的问题。因此,针对此地层采用了降水井复合施工技术,即对地下水位以上的部分采用人工开挖,锥形模板护壁并浇筑护壁混凝土,对地下水位以下部分采用冲击钻成孔,泥浆护壁,并通过洗井、下设钢筋笼、安装抽水设备等工序。该技术节约了成本,缩短了工期,提高了功效。
When the conventional method is used to construct the dewatering wells in the deep overburden of the slope card station in Jiulong County, Ganzi Prefecture, Sichuan Province, it is easy to cause the collapse of the lining of the borehole, the leakage of slurry and the problem of low efficiency of forming holes. Therefore, for this stratum, composite technology of downhole was adopted, that is, artificial excavation, conical formwork retaining wall and concrete pouring wall were adopted for the part above the groundwater level, and the percussion drill was used to make holes and mud to protect the wall below the groundwater level Wash well, under the steel cage, installation of pumping equipment and other processes. The technology saves costs, shortens the construction period, and improves efficiency.