The method and structure of controlling the water pressure of the floor in the construction of the floor of the deep foundation pit

Abstract

The invention discloses a control structure for floor water pressure in the foundation pit floor construction of a deep foundation pit, which comprises a blind ditch arranged at the bottom of the concrete cushion under the foundation pit bottom slab and a plurality of stainless steel implanted in the blind ditch according to the vertical direction Drainage pipe; the blind ditch includes multiple concentrically arranged circumferential grooves and multiple radial grooves that are radial to the center and penetrates multiple circumferential grooves, and the circumferential and radial grooves are backfilled with a mixture of sand and gravel material, the lower end of the stainless steel drainage pipe is inserted into the sand-stone mixture, the upper end of the stainless steel drainage pipe passes through the concrete cushion and the foundation pit floor, and is exposed to the upper surface of the foundation pit floor; each stainless steel drainage pipe is installed A water pressure valve, and the upper ends of all stainless steel drain pipes are combined and connected to a water pipe. The invention is beneficial to the bottom plate pouring of deep foundation pit (deep working well) during construction and the control of the water pressure of the bottom plate during working service, avoiding the settlement of surrounding soil layers caused by excessive pumping of groundwater, and ensuring the safety of surrounding buildings.

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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