Construction method for well point dewatering

Abstract

The invention provides a construction method for well point dewatering. The construction method comprises the following steps of (1) according to a design drawing for the well point dewatering, measuring and paying off at the construction site, and determining the well drilling location, channel position and horizontal elevation of a well point; (2) adopting a well drilling machine to drill a well hole with design depth at the determined well drilling position; (3) excavating and paving the channel of a well point pipeline; (4) paving the pipeline in the well hole, putting a well point pipe of which the bottom end is provided with a deformable pipe-shaped filtering assembly into the well hole, and fixing the bottom end of the well point pipe to the design depth; (5) expanding and opening the deformable pipe-shaped filtering assembly, and tightly attaching the deformable pipe-shaped filtering assembly to the wall of the well hole, so as to realize the functions of supporting the wall of the well hole and filtering; (6) installing a water suction pump, paving a water delivery main pipe, and connecting the water outlet end of each well point pipe and the water delivery main pipe, so as to perform the water suction construction. The construction method has the advantages that the underground water can be smoothly drained out, and the sand and slit are blocked into the well hole.

Description

technical field [0001] The invention relates to a construction method for foundation pit dewatering support used in building construction, in particular to a construction method for well point dewatering. Background technique [0002] With the development of modern society, the use functions of buildings are constantly expanding. Especially in big cities, new buildings are more and more widely used for underground space. From ten meters to dozens of meters. Therefore, new requirements are also put forward for the method of foundation pit construction. [0003] A well point dewatering construction technology in the prior art generally uses an ordinary geological drilling rig to drill into a hole through a mud wall, install a filter tube to form a tube well, and then use high-pressure water jet flushing in the filter tube to destroy the wall mud structure layer. A filter layer is formed around the filter tube, and then the water outlet pipe with a submersible pump at the fro...

AI Technical Summary

Problems solved by technology

However, this kind of construction method is cumbersome to operate in actual construction, and the filter pipe is extremely easy to accumulate and block, resulting in the well point being blocked and becoming a dead well.

If the precipitation is not successful, it will easily lead to major engineering accidents, such as the foundation pit collapse accidents frequently reported in China are related to this

[0004] Among the existing construction methods, there is also a construction method that uses sand and gravel filler in the borehole as a filter layer, but this method also has the disadvantage of cumbersome construction, and it also cannot avoid silting and clogging, resulting in well point blocking flaw in being a dead well

Images