Foundation pit breast board supporting and sealing structure and construction method thereof

Abstract

The invention discloses a pit breast board supporting and sealing structure and a construction method thereof. The pit breast board supporting and sealing structure comprises drilling injection piles,breast board anchoring and positioning devices and a breast board; the breast board anchoring and positioning devices are vertically fixed on a rebar cage at intervals; each breast board anchoring and positioning device comprise support brace rods, a large arc brace rod and a small arc brace rod; U-shaped grooves are fixed on two sides of the support brace rods; a steel plate sealing belt is arranged in each U-shaped groove; the breast board is provided with a body; two ends of the body are bent upwards and form bending edges; and the bending edges of the breast board are separately connectedto the steel plate sealing belts in the U-shaped grooves on the injection piles on the two sides and form a breast sealing edge jointly with the injection piles on the two sides. The earth-among-pilebreast board disclosed by the invention is convenient to assemble and disassemble and is easy to operate; the breast board can baffle soil and can also baffle water and prevent permeation; foundationpit supporting time can be shortened; on-site construction speed can be enhanced; besides, the tool-type breast board can be used repeatedly, so that cost is reduced; and the construction cost is lowered.

Description

technical field [0001] The invention relates to the technical field of foundation pit retaining board support, in particular to a foundation pit soil retaining board support, a water stop structure and a construction method thereof. Background technique [0002] During the construction of underground comprehensive pipe corridors, underground spaces, deep foundations of high-rise buildings or basements, due to tight urban land use, narrow sites, dense surrounding buildings and roads, and many underground pipe networks, in order to prevent cracks, inclinations (or cut off traffic and pipelines), deep foundation pits are excavated vertically without sloping, when the soil quality is poor and the groundwater level is high, the retaining support structure is often required not only to retain soil, but also to resist penetration, and the underground diaphragm wall , underground continuous cast-in-place piles, drilled cast-in-place piles + high-pressure rotary grouting piles combin...

AI Technical Summary

Problems solved by technology

[0002] During the construction of underground comprehensive pipe corridors, underground spaces, deep foundations of high-rise buildings or basements, due to tight urban land use, narrow sites, dense surrounding buildings and roads, and many underground pipe networks, in order to prevent cracks, inclinations (or cut off traffic and pipelines), deep foundation pits are excavated vertically without sloping, when the soil quality is poor and the groundwater level is high, the retaining support structure is often required not only to retain soil, but also to resist penetration, and the underground diaphragm wall , underground continuous cast-in-place piles, drilled cast-in-place piles + high-pressure rotary grouting piles combined retaining piles and steel sheet piles, although the problem of anti-seepage and soil retaining can be solved, these support forms require high construction technology and complex joints , long construction period, high cost, complicated construction conditions, and great damage to the environment

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