Substrate water gushing and sand gushing treatment method

Abstract

The invention belongs to the technical field of building construction, and particularly relates to a substrate water gushing and sand gushing treatment method. The treatment method comprises the following steps that S1, surveying and setting out are carried out, and the position of a secondary excavation foundation pit is determined; S2, supporting piles and a waterproof curtain are constructed; S3, a foundation pit is excavated; S4, the soil surface is excavated to a preset elevation and flattened, and a submersible pump is placed to pump and drain accumulated water; S5, water and sand gushing points on the soil surface of the substrate are found out, and a water flowing pipeline is built by using bricks, so that water flowing out of the water gushing points is collected to a middle dewatering well to be discharged; S6, a formwork and plastic cloth are laid on the top faces of the bricks; S7, a water stop steel shaft is installed in the dewatering well, and a cushion layer is poured;S8 a waterproof layer is laid, and concrete is poured; and S9, the dewatering well is plugged. According to the substrate water gushing and sand gushing treatment method, the bottom surface of the foundation pit can be rapidly and effectively sealed, the harmful effect of water gushing and sand gushing of the substrate on the foundation pit is restrained to a large extent, and safe and smooth construction of a main body reinforced concrete structure is guaranteed; and the construction method is simple, low in cost and remarkable in effect.

Description

technical field [0001] The invention relates to the field of underground engineering foundation pit excavation construction, in particular to a treatment method for water gushing and sand gushing at the base. Background technique [0002] In the deep foundation pit project of the subway station, it is more difficult to excavate the second foundation pit, and the phenomenon of water gushing and sand gushing in the base often occurs, which leads to the collapse of the surrounding area, causing serious consequences. Therefore, after the excavation of the foundation pit is completed, the bottom should be closed as soon as possible, and the cushion should be poured to reduce the erosion of the surrounding soil by the gushing water. [0003] The method to deal with the water and sand inrush in the basement is generally to build dewatering wells around the area, force pumping and drainage, and reduce the water inflow at the excavation surface by lowering the water level. However, ...

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Problems solved by technology

[0004] In order to solve the problem that the deep foundation pit of the subway station is prone to water gushing and sand gushing during the secondary excavation process and cause damage to the foundation pit, the present invention provides a treatment method for water gushing and sand gushing of the base

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