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主井通过表土流砂层多采用冻结等各种特殊凿井法，由于工艺复杂，需特殊的设备施工，因而工期长、工程造价高。本文介绍的碎石护壁自重沉井过表土流砂层施工法，系利用沉箱自重压迫刃脚切入第四系表土流砂层，人工进行挖掘，随着沉箱刃脚切入下沉而接高加重沉箱，再挖掘、下沉、接高沉箱，直到刃脚插入风化基岩，最终内套壁成井。此种施工法克服了冻结等各种特殊凿井法的弊端。
The main shaft through the topsoil sand and more use of freezing and other special drilling method, due to complex processes, the need for special equipment construction, and thus a long construction period, high project costs. In this paper, the gravel stratum wall overburden pervious topsoil sand layer construction method, the use of caissons dead weight oppressive cutting edge into the Quaternary surface runoff sand, manual excavation, with the caisson blade cut into the sink and then add high caissons, and then Excavation, sinking, followed by high caisson, until the edge of the foot weathered bedrock, the final wall into the well. This construction method to overcome the shortcomings of freezing and other special drilling method.