Concrete bottom slab pouring method for deep foundation pit confined water surge decompression and water control

Abstract

The invention discloses a concrete floor pouring method for pressure reduction and water control of sudden rushing of confined groundwater of a deep foundation pit, relating to the technical field ofcivil and construction. The method comprises the following steps: arranging temporary cofferdams on the bottom surface of the foundation pit in the peripheries of the sudden rushing; symmetrically arranging at least two pressure reducing tube wells in the peripheries of the temporary cofferdams on the outer sides of the temporary cofferdams by taking corresponding sudden welling points as centers;and pumping underground water from the pressure reducing tube wells. Pressure reduction and water control of the sudden rushing of confined groundwater of the deep foundation pit are solved by meansof a pressure reducing water control system. When the sudden rushing of confined groundwater of the deep foundation pit happen, the sudden rushing of high pressure and large capacity confined groundwater can be terminated within a short period. The method overcomes the difficulty that wells are hard to form in the high pressure and large capacity confined groundwater and clean water cannot be discharged, and can be organized and implemented within a short time after sudden rushing, so that the water control effect is obvious.

Description

technical field [0001] The invention relates to the technical fields of civil engineering and building construction, and is mainly applicable to the pouring construction technology of concrete bottom slabs that are prone to pressurized water surges in deep foundation pits. Background technique [0002] In the construction process of the concrete floor of deep foundation pit, because the elevation of the floor is close to the confined water aquifer, in the accidents of deep foundation pit engineering, the accidents caused by the inrush of the bottom confined water account for a large part. Surges are difficult to deal with, and improper handling can cause serious consequences. [0003] In order to avoid the adverse consequences caused by the foundation pit surge, the existing project is to excavate interconnected shallow trenches before each surge point, and the underground mud gushing out of each surge point is concentrated and then pumped out. Such treatment often makes th...

AI Technical Summary

Problems solved by technology

Such treatment often makes the whole deep foundation pit project place in the mud, and, because of the concentrated water gushing at the inrush point, the local serious damage and collapse of the underground layer are caused, so that the stability of the finally formed deep foundation pit concrete floor is poor, and the foundation Quality can't stand the test