Method and structure for controlling water pressure of bottom plate in deep foundation pit bottom plate construction

Abstract

The invention discloses a structure for controlling water pressure of a bottom plate in deep foundation pit bottom plate construction. The structure comprises a blind ditch arranged at the bottom of a concrete cushion layer below a foundation pit bottom plate and a plurality of stainless steel drainage pipes vertically implanted into the blind ditch, wherein the blind ditch comprises a plurality of annular grooves which are concentrically arranged and a plurality of radial grooves which are radially distributed according to the center and penetrate through the plurality of annular grooves; the annular grooves and the radial grooves are backfilled with gravel mixtures; the lower ends of the stainless steel drainage pipes are inserted into the gravel mixtures; the upper ends of the stainless steel drainage pipes penetrate through the concrete cushion layer and the foundation pit bottom plate, and are exposed out of the upper surface of the foundation pit bottom plate; each stainless steel drainage pipe is provided with a water pressure valve; and the upper ends of all the stainless steel drainage pipes are gathered and then connected to a water pipe. The structure is beneficial to pouring of the deep foundation pit (deep working well) bottom plate during construction and control of water pressure of the bottom plate during working and service, sedimentation of surrounding soil layers caused by excessive pumping of underground water is avoided, and safety of surrounding buildings is guaranteed.

Description

technical field [0001] The invention relates to a blind ditch structure of a deep foundation pit (deep working well) in an aquitard, in particular to a pumping structure for controlling the floor water pressure of a deep foundation pit (deep working well) in a strongly weathered permeable layer. Background technique [0002] With the rapid development of my country's economy and the rapid growth of city size and population, the above-ground space resources have become increasingly tense. In order to alleviate the shortage of land resources and traffic congestion caused by the accelerated urbanization process, structures are gradually developed underground, such as underground stations, underground parking lots, and subway tunnels. In order to meet the construction requirements of buildings and structures, the excavation depth and scale of deep foundation pits (deep working wells) should be increased first. However, due to the extremely complex geological conditions in deep ...

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Problems solved by technology

[0005] Regarding the above-mentioned prior art, the present invention provides a pumping structure to control the water pressure of the deep foundation pit bottom plate in the strongly weathered aquitard, so as to solve the problem of groundwater permeation that is prone to occur during the construction of the bottom plate of the deep foundation pit (deep working well) in the strongly weathered aquifer Reduce the problem of soil settlement caused by excessive groundwater pumping in surrounding strata

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