A plugging method for dewatering wells in foundation pits

Abstract

The invention provides a decompression type blocking method for a foundation pit dewatering well. The method includes the steps of step 1, sleeving a waterproof casing pipe outside a dewatering well pipe and carrying out reinforcement and embedment, step 2, embedding the waterproof casing pipe and pouring the waterproof casing pipe into foundation base plate concrete, step 3, cutting off unnecessary well pipes on the base plate surface after basement base plate concrete reaches a certain strength, inserting one drainage shock tube into the lower portion of the well pipes, and enabling the top end of the drainage shock tube to be communicated with a water conduit, step 4, shutting in the well, lifting a water pump out, then filling well shut-in materials into the dewatering well pipes sequentially, step 5, enabling a cover plate and the waterproof casing pipe to be connected and fixed and enabling a small amount of water to flow out independently from the shock tube, step 6, starting a mud jack pump and compressing curing agents into the dewatering well pipe, and step 7, cutting off the portions, exposed out of the surface of the base plate, of the drainage shock tube, and then using high-intensity concrete to block portions around the well pipe. Thus, blocking of the dewatering well is finished. The decompression type blocking method is wide in application range, high in construction efficiency, convenient to operate, good in water-stop effect and small in later influence.

Description

technical field [0001] The invention relates to foundation pit construction in building foundation engineering, in particular to a pressure-relieving plugging 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 aft...

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.

Images