Construction method of water-stop curtain with soil replacement and mixing

Abstract

The invention relates to a soil-removal-and-replacement stirring method for constructing a waterproof curtain. The soil-removal-and-replacement stirring method includes the steps that 1, guiding hole pile positions are arranged along the axes of cement mixing piles; 2, steel pile casings are buried, the hole walls are stabilized through mud, and in-hole to-be-excavated soil is taken out through a rotary drilling machine with a wet method; 3, holes are drilled, and the hole walls are stabilized through mud till the guiding holes and backfill operation space meet requirements; 4, the mud in the pile holes is removed through an air lifting mud removing machine, and the pile holes are filled with pile forming soil materials; 5, when the backfill completing distance meets the cement mixing pile continuous working requirement, a mud discharging guide furrow is excavated; 6, a cement mixer is in position, and cement mixing piles are constructed; 7, an unprocessed interlayer part left between every two adjacent guiding hole pile hole positions is forcedly mixed through a mixed machine, and soil-removal-and-replacement construction of the waterproof curtain is completed. The soil-removal-and-replacement stirring method is scientific and reasonable in design, simple in technology and low in construction cost, and is used for deep-foundation-pit waterproof curtain, common construction machines are sufficiently used, the completed waterproof curtain is good in waterproof effect, and construction is safe and reliable.

Description

technical field [0001] The invention belongs to the field of water-stop curtains, in particular to a construction method of a water-stop curtain with soil replacement and stirring. Background technique [0002] During the construction of underground engineering, especially deep foundation pit engineering with high groundwater level, it is often necessary to install a water-stop curtain on the outside of the support pile. The water-stop curtain is generally formed by continuous cement-soil mixing piles. When the water-stop curtain encounters difficult geological layers within the designed depth range, such as pebble gravel layer, hard sand interlayer and boulders, etc., use conventional cement-soil mixing pile machinery, such as two-axis cement-soil mixing pile machine , three-axis cement-soil mixing pile driver, etc. are difficult to complete. [0003] For sand interlayers that are difficult to penetrate, single-pipe high-pressure jet spray equipment can be used to loosen t...

AI Technical Summary

Problems solved by technology

However, during the construction of the occlusal pile, the quality and stability of the ultra-retarded concrete are extremely high, and the gap between the A pile and the B pile of the occlusal pile is very easy to leak due to the deflection in the direction perpendicular to the wall

The joints of the ground connection wall are prone to leakage. Using a double-wheel milling machine can effectively avoid leakage at the joint, but the cost of this process is high, and the cost of the ground connection wall itself is relatively high, so it is not suitable for all projects

[0005] The TRD construction method can easily deal with hard ground, such as cobblestone, viscous silt, sandstone, kerogen shale, limestone, granite, etc., and it can be stirred evenly without bad bite, ensuring high continuity and high water-stop performance of the wall, but the TRD construction method is expensive.

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