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

基坑内干扰地层中减压降水补井成井结构

Abstract

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.
本实用新型涉及一种基坑内干扰地层中减压降水补井成井结构。钢管护筒由栈桥上压入至含水层中地层未因承压水突涌或其他因素受到干扰的部位,井管设于钢管护筒内部,钢管护筒的外部还设有钢套管,位于大底板或垫层处;钢管护筒开有返浆洞口,稍高于承压水水位,泥浆箱设在稍低于承压水水位处的支撑平台上,泥浆箱的泥浆管连接返浆洞口;沉淀管安装在井管的井底,过滤器安装在沉淀管的上部;在井管和钢管护筒之间设有三层填充层,底层为过滤层,中部为止水层,上部为混凝土层。使用了本实用新型结构的基坑开挖工程,即便遭遇承压水突涌造成地层扰动的情况,也能防止对深坑外围的大底板的破坏,确保基坑开挖和封底的顺利。

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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