Pressure-reduction and dewatering supplementary well completion structure in disturbance stratum inside foundation pit



The utility model relates to a pressure-reducing and dewatering supplementary well completion structure in a disturbance stratum inside a foundation pit. A steel pipe protection cylinder is pressed from a trestle into a position of a water-bearing stratum where the stratum is not disturbed because of confined water inrush or other factors, a well pipe is disposed inside the steel pipe protection cylinder, and a steel sleeve is also disposed outside the steel pipe protection cylinder at a place where a large base plate or a cushion layer is disposed. The steel pipe protection cylinder is provided with a slurry returning opening which is slightly higher than the water level of the confined water, a slurry box is disposed on a support platform which is slightly lower than the water level of the confined water, and a slurry pipe of the slurry box is connected with the slurry returning opening. A sediment tube is disposed in a pit bottom of the well pipe, and a filter is disposed above the sediment tube. Three filling layers are disposed between the well pipe and the steel pipe protection cylinder, with a bottom layer being a filtering layer, a middle layer being a water stop layer and a top layer being a concrete layer. By using the structure of the utility models to construct foundation pit excavation projects, even if the situation of stratum disturbance caused by confined water inrush occurs, damages to the large base plate at a periphery of the pit can be prevented and smooth foundation pit excavation and bottom sealing can be ensured.




Download Full PDF Version (Non-Commercial Use)

Patent Citations (0)

    Publication numberPublication dateAssigneeTitle

NO-Patent Citations (0)


Cited By (4)

    Publication numberPublication dateAssigneeTitle
    CN-103334444-AOctober 02, 2013中国一冶集团有限公司Decompression type blocking method for foundation pit dewatering well
    CN-103334444-BApril 20, 2016中国一冶集团有限公司一种基坑降水井泄压式的封堵方法
    CN-103343543-AOctober 09, 2013中国一冶集团有限公司一种基坑降水井减压式封堵方法
    CN-105350555-AFebruary 24, 2016上海长凯岩土工程有限公司, 上海岩土工程勘察设计研究院有限公司一种降水井的快速施工方法