Anti-floating and waterstop construction method for small-area deep foundation pit of building

Abstract

The invention relates to an anti-floating and waterstop construction method for a small-area deep foundation pit of a building. The method comprises the steps that well-point dewatering is carried out on the surrounding of the small-area deep foundation pit; after the underground water level descends to the position 500 mm below a raft, soil of the small-area deep foundation pit is excavated; a concrete anti-floating protective shell is constructed; waterproof coiled materials are laid inside the concrete anti-floating protective shell, and the outer portion of the concrete anti-floating protective shell is refilled with graded sand and stone; the concrete anti-floating protective shell is maintained, and other cushion layers of the foundation pit are constructed; dewatering is stopped, a dewatering well is sealed, and the coiled materials inside the concrete protective shell and coiled materials at other portions are connected into a whole; the concrete anti-floating protective shell bears water pressure independently, and the raft is constructed inside the shell. The method has the advantages that well-point dewatering is directly arranged at an upper mouth of the small-area deep foundation pit, the range of influence of a dewatering pipe is concentrated, and the dewatering effect is good; the concrete anti-floating protective shell bears the water pressure, and the raft is protected and can be normally constructed inside the shell; dewatering is stopped in advance, the waterproof layers are continuously laid inside the anti-floating shell, and the waterproof layers inside the anti-floating protective shell and other waterproof layers of other foundation pits form a complete waterproof system.

Description

technical field [0001] The invention relates to a building construction method, in particular to a small-area deep foundation pit anti-floating and water-stop construction method. Background technique [0002] Before the excavation of a small-area deep foundation pit of a building, it is generally necessary to dewater the well point, and the groundwater level is lowered to 500mm below the raft before the earth can be excavated. This method needs to set up well points around the foundation pit around the building in advance. Precipitation, the existing problems are: long construction period, limited scope of precipitation, affecting precipitation effect; caisson construction technology can also be used, but the earthwork inside the caisson can only be excavated manually, long construction period and caisson construction cannot Disadvantages of ensuring waterproof continuity of the membrane. Contents of the invention [0003] The object of the present invention is to provid...

AI Technical Summary

Problems solved by technology

[0002] Before the excavation of a small-area deep foundation pit of a building, it is generally necessary to dewater the well point, and the groundwater level is lowered to 500mm below the raft before the earth can be excavated. This method needs to set up well points around the foundation pit around the building in advance. Precipitation, the existing problems are: long construction period, limited scope of precipitation, affecting precipitation effect; caisson construction technology can also be used, but the earthwork inside the caisson can only be excavated manually, long construction period and caisson construction cannot Disadvantages of ensuring membrane waterproof continuity

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