Micro pumping and drainage device for groundwater in narrow foundation pit and its construction method

Abstract

The invention discloses a miniature pumping and drainage device for groundwater in a narrow foundation pit and a construction method thereof. The construction method of the water pump includes using a drill pipe adapter drill pipe and a hand-held drill, operating the hand-held drill to drill the outer drill pipe and the inner drill pipe into the pit wall at the water seepage point on the wall of the foundation pit; Pull out the inner drill pipe to discharge the soil, wrap it with geotextile and insert it into the outer drill pipe, and connect the drill pipe to one end of the drainage hose through the drainage adapter, and connect the other end of the drainage hose to the foundation pit that is not subject to water seepage. The tank connection of the reservoir pump affecting the side of the retaining wall. The invention solves the technical problem of drilling drainage holes on the wall of the foundation pit with rich groundwater and narrow space, and solves the problem that the drainage of the foundation pit is limited by the geometric size of the foundation pit, the power of the machine tool, the head, etc., and the accumulation of water at the bottom of the pit Technical problems such as difficulty in pumping and drainage.

Description

technical field [0001] The invention relates to the technical field of construction equipment for narrow and small foundation pits in structural engineering in areas with rich groundwater, in particular to a miniature pumping and drainage device for groundwater in narrow foundation pits and a construction method thereof. Background technique [0002] The excavation of narrow and small foundation pits (such as anti-slide piles, small drainage level aisles, vertical shafts / inspection wells, etc.) in structural engineering in areas with rich groundwater is often restricted by manual excavation of pit wall drainage holes. Manually excavated foundation pits are affected by the difference in the distribution of groundwater and rock and soil properties. The soil layer or rock layer on the pit wall is prone to water seepage and gushing during the excavation of the foundation pit, which leads to difficulties in forming the retaining wall, collapse of the rock and soil mass on the pit ...

AI Technical Summary

Problems solved by technology

[0010] In view of this, the present invention provides a narrow foundation pit groundwater micro pumping device and its construction method to solve the problem of drilling and forming drainage holes on the pit wall of a foundation pit with rich groundwater and narrow space, which cannot be achieved by ordinary conventional drilling tools. When working in a small foundation pit, it is difficult to form a drainage hole in the rock and soil affected by water seepage. The soil in the drilled hole in the area with large groundwater seepage cannot be removed. After drainage in the pit, it is easy to form water at the bottom of the pit. Technical problems such as restrictions on machine power and head, difficulty in pumping and draining accumulated water at the bottom of the pit, etc.

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