Positive and negative pressure combined dewatering well structure with self-cleaning function and construction method

Abstract

The invention discloses a positive and negative pressure combined dewatering well structure with a self-cleaning function. Drainage holes are formed in a drainage pipe; a vacuum pump communicates with a water pumping pipe; an air compression pump communicates with an air compression pipe; the upper portions of the water pumping pipe and the air compression pipe further communicate with an adjusting pipe; a valve B is also arranged between the adjusting pipe and the water pumping pipe; a valve A is also arranged between the adjusting pipe and the air compression pipe; a valve D is also arranged on the air compression pipe; a valve C is also arranged on the water pumping pipe; and the water pumping pipe and the air compression pipe deep extend into the drainage pipe. The dewatering efficiency of different soil layers can be adjusted by adjusting the positive pressure and negative pressure above the water level in the dewatering well; and the positive and negative pressure combined dewatering well structure provided by the invention has the cleaning function, the pipe-in-pipe design is adopted, under the condition that an outer pipe is blocked, by increasing the air pressure above the water level between an inner pipe and the outer pipe and impacting the water level in the inner pipe by a piston at the same time, the water flow rushes to the drainage holes of the outer pipe, so that sandy soil on geotechnical cloth is flushed, the cleaning of the dewatering well is achieved, and the cleaning efficiency is improved.

Description

Technical field [0001] The present invention relates to the field of civil engineering, and in particular to a positive and negative pressure combined with water well well structure and construction method with self-cleaning function. Background technique [0002] During the construction of the foundation pit excavation, it is necessary to set a precipitation well around and / or the foundation of the foundation pit to reduce the groundwater level of the foundation pit and ensure construction safety. [0003] The existing precipitation generally includes a well pipe, and the well tube is sequentially in order to the lower factor segment, filter tube section and upper real tube section, and the filter tube section out of the nylon net, the surrounding of the well is filled with filter material, precipitation, precipitation well The surrounding groundwater passes through the filter material and enters the well pipe from the filter tube. The filter tube has the effect of filtration ...

AI Technical Summary

Problems solved by technology

[0003] Existing dewatering wells generally include well pipes. The well pipes from bottom to top are the lower solid pipe section, the filter pipe section and the upper solid pipe section. The filter pipe section is covered with a layer of nylon mesh, and the well pipe is filled with filter materials. The surrounding groundwater passes through the filter material and enters the well pipe from the filter pipe section. The filter material and filter pipe have the effect of filtering sediment. After a long time, the filter material and filter pipe are easily blocked by sediment, or even blocked, which affects the precipitation of the precipitation well.

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