Foundation pit dewatering method

Abstract

The invention provides a foundation pit dewatering method and belongs to the technical field of building construction. The foundation pit dewatering method comprises the steps that a hole is formed inthe bottom of a foundation pit, and a well-hole for accommodating a main filter pipe is formed; the main filter pipe is accommodated in the well-hole; water is pumped from the main filter pipe; holesare formed in the bottom of the foundation pit, and water-pumping holes for accommodating subsidiary filter pipes are formed; the subsidiary filter pipes are accommodated in the water-pumping holes;and water is pumped from the subsidiary filter pipes, wherein the diameter of the main filter pipe is larger than the diameter of the subsidiary filter pipes, multiple water-pumping holes are uniformly distributed around the well-hole, and the subsidiary filter pipes are in one-to-one correspondence with the water-pumping holes. By means of the foundation pit dewatering method provided, water canbe pumped from the main filter pipe and the subsidiary filter pipes which are arranged at the bottom of the foundation pit simultaneously through water pumps, and the dewatering effect of the foundation pit is improved.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a method for dewatering a foundation pit. Background technique [0002] In the process of building construction, it is necessary to excavate a soil pit at the foundation design position according to the base elevation and foundation plane size, that is, the foundation pit. In order to avoid the impact of groundwater on the excavation of the foundation pit and subsequent construction, drainage and precipitation work is required after the excavation of the foundation pit and after the excavation. [0003] The current foundation pit dewatering usually adopts the well point method, that is, a certain number of filter pipes are buried around the foundation pit, and the suction pipe of the pumping equipment is inserted into the water filter pipe to extract the water in the filter pipe to reduce the water level in the foundation pit. [0004] However, when the foundation ...

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Problems solved by technology

[0004] However, when the foundation pit is dewatered by the above method, when the groundwater type near the foundation pit is submerged, or the highest groundwater level is close to the natural ground, the precipitation effect is relatively poor

And for foundation pits with silty clay layers, due to the relatively high permeability of silty clay layers, the infiltration of groundwater in the foundation pit increases, resulting in poor precipitation effect

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