Construction method of soil replacement stir waterproof curtain based on gravels

Abstract

The invention relates to a construction method of a soil replacement stir waterproof curtain based on gravels. The construction method comprises the following steps: (1) a leading hole pile position is cast according to the axis of a cement mixing pile; (2) a steel protection cylinder is embedded; a hole wall is stabilized by mud; soil to be dig in a hole is taken out by a rotary drilling machine through a wet method; (3) the hole wall of the drilled hole is stabilized by the mud until the hole leading and backfill operation space satisfies the requirements; (4) the mud in the pile hole is removed by gas lift mud removing machinery; and pile soil is filled back; (5) the backfill completion distance satisfies the continuous operation requirements of the cement mixing pile; and a mud removing ditch is dig; (6) a cement mixing machine is in place; and the cement mixing pile constructs; and (7) the remained un-treated interlayer part of two adjacent leading hole pile positions is forcedly stirred by stirring machinery to finish construction of the soil replacement stir waterproof curtain. The construction method is scientific and reasonable in design, used for a deep foundation pit waterproof curtain, simple in process and low in construction cost, fully uses common construction machinery, is excellent in waterproof effect of the finished waterproof curtain, and is safe and reliable in construction.

Description

[0001] This application is a divisional application whose patent application number is 201410813752.X, the patent name is the construction method of water-stop curtain for soil replacement and stirring, and the original application date is 2014.12.23. technical field [0002] The invention belongs to the field of water-stop curtains, in particular to a gravel-based soil replacement and stirring water-stop curtain construction method. Background technique [0003] 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, suc...

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

[0006] The TRD construction method can easily deal with hard ground, such as cobblestone, viscous silt, sandstone, kerogen shale, limestone, granite, etc., and the mixing is uniform 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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