Basement permanent drainage and pressure reduction anti-floating construction method

Abstract

The invention discloses a permanent drainage and pressure reduction anti-floating construction method, and belongs to the field of constructional engineering foundation pit construction. The method solves the problem of groundwater drainage when a substrate is located in an impervious bed. The method comprises the following steps that (1) a permanent drainage and pressure reduction anti-floating system which is composed of drainage holes, drainage and pressure reduction anti-floating devices, drainage ditches and a water collecting well is designed; (2) the drainage holes are formed in an external shear wall of a non-civil-air-defense-area basement and a base plate; (3) the drainage and pressure reduction anti-floating devices are pre-buried in the drainage holes in the steel bar binding process so as to complete construction of a basement structure; (4) earthwork backfilling is carried out outside a pit, and concrete hardening is carried out; (5) earth excavation is carried out at thebottoms of the devices, the holes are cleaned, water filter bags and water filtering devices are placed, and the device on the external shear wall is connected to a bent pipe so as to drain water into the drainage ditches; and (6) underground water in the water collecting well is pumped to a municipal pipe network. According to the method, the problems of drainage of surface seepage water, peripheral original soil seepage water and infiltration construction water can be basically solved, so that the problems of base plate floating and structure cracking caused by the rise of the water level of the basement can be solved.

Description

technical field [0001] The invention relates to the field of construction engineering foundation pit construction, in particular to foundation pit construction when the base is located in an impermeable layer. Background technique [0002] At present, the anti-floating design methods mainly adopted in China are the counterweight method, anti-floating anchor rods, and anti-floating piles, all of which are passive anti-floating design methods. When the base is located in the impermeable layer, the present invention can better combine the existing anti-floating design method or the case of no anti-floating design, actively drain the groundwater, lower the groundwater level, and eliminate the basement structure caused by the failure of the anti-floating design cracking. Contents of the invention [0003] The object to be achieved by the present invention is to provide a basement permanent drainage depressurization and anti-floating construction method. When the base is locate...

AI Technical Summary

Problems solved by technology

[0002] At present, the anti-floating design methods mainly used in China are counterweight method, anti-floating anchor rod, and anti-floating piles, all of which are passive anti-floating design methods. Anti-floating is easy to fail, causing the basement to float up, causing cracks in the basement structure, and the treatment is very troublesome.

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