Foundation pit dewatering well pressure-reduction-type plugging method

Abstract

The invention provides a foundation pit dewatering well pressure-reduction-type plugging method. The method comprises the following steps that (1) at least one water stop ring is arranged on the outer wall of a dewatering well pipe; (2) bottom plate concrete is poured on the outer wall of the well pipe; (3) after the bottom plate concrete of a basement reaches certain strength, unnecessary well pipes on the surface of a bottom plate are cut off, and a drainage floral tube is inserted in the lower portion of a well pipe; (4) when the well is plugged, a water pump in the dewatering well pipe is lifted out, a drainage pump is started to drain water, and well plugging materials are then filled in the dewatering pipe sequentially; (5) the drainage pump stops working, and a small amount of gushing water flows out of the floral tube by itself; (6) a mud jacking pump is started to press curing agents in the dewatering well pipe; (7) the opening of the well pipe is plugged through a cover plate, the periphery of the well pipe is plugged through high-strength concrete, and dewatering well plugging is finished. The foundation pit dewatering well pressure-reduction-type plugging method is particularly suitable for engineering such as a basement which is high in underground water level, large in the amount of gushing water and high in water-proof requirements, very wide in application range, high in construction efficiency, convenient to operate and good in water plugging effect, and ensures that a later-period is hardly affected.

Description

technical field [0001] The invention relates to foundation pit construction in building foundation engineering, in particular to a decompression-type sealing method for a foundation pit dewatering well. Background technique [0002] At present, some super-large and super-deep foundation pits have the characteristics of rich connections between groundwater and river systems, large influx of water from precipitation wells, and fast speed. sexual hazards. However, the existing plugging methods for dewatering wells generally suppress the head of underground water gushing water by means of medium-coarse sand, clay balls, and dry cement backpressure. It is difficult to ensure that the foundation floor is kept dry. It is more difficult to complete well closure in areas with large and fast gushing currents. [0003] In the prior art, different plugging methods are generally determined according to the amount of groundwater. When the groundwater is small, a part can be blocked afte...

AI Technical Summary

Problems solved by technology

The actual operation of this method is complex and tedious, and takes a long time, especially for projects with high groundwater levels, large inflows, and fast inflows, the plugging effect is not good, and the bottom plate often has water seepage problems to be dealt with later.

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