Waterproof curtain wall for foundation pit

Abstract

The invention discloses a waterproof curtain wall for a foundation pit, and belongs to the field of construction of foundation pits. At least one layer of waterproof curtains consisting of a plurality of high-pressure jet grouting piles is arranged on outer sides of support piles of the foundation pit or among the support piles of the foundation pit; bottoms of the high-pressure jet grouting piles are placed on an impervious stratum below the bottom of the foundation pit; the adjacent high-pressure jet grouting piles of the waterproof curtains on the same layer are gripped with one another; the adjacent high-pressure jet grouting piles between the waterproof curtains of the adjacent layers are gripped with one another; the waterproof curtains arranged among the piles are gripped with the support piles; and the diameter of a gripping portion of each high-pressure jet grouting pile is 1/4-1/3 of the diameter of each pile. The waterproof curtain wall for the foundation pit has high permeability coefficient in underground water, has a high gripping effect when difficulty on tube well dewatering is high, is convenient and speedy, and has a high waterproof effect.

Description

technical field [0001] The invention belongs to the field of foundation pit construction, in particular to foundation pit water stop construction. Background technique [0002] At present, commonly used water-stop curtains include deep mixing piles, high-pressure pendulum spray walls, etc. [0003] The advantage of the deep mixing pile waterproof curtain is that the cement soil is impermeable after mixing, the construction speed is fast, and the cost is low. However, the depth of the curtain is limited, and the soil layer with a standard penetration number greater than 15 is difficult to construct, and the verticality of the pile body is required to be high. If there is a deviation, it will easily cause water leakage at the fork. [0004] High-pressure pendulum spraying wall used as water-stop curtain can form a well-lapped impermeable wall with good water-stop effect and fast construction speed, but the cost is slightly higher than that of mixing pile. [0005] The existi...

AI Technical Summary

Problems solved by technology

The construction occupies less land, has little vibration and low noise, but it is easy to pollute the environment and the cost is high. It is not suitable for special soil that cannot solidify the sprayed slurry.

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