Soil changing mixing waterproof curtain construction method based on pebbles

Abstract

The invention relates to a soil changing mixing waterproof curtain construction method based on pebbles. The method comprises the following steps: (1) arranging hole guiding pile positions along the axis of a cement mixing pile; (2) embedding steel pile casings, stabilizing hole walls with mud, taking out to-be-dug soil in the holes by adopting wet operation with a rotary excavator; (3) stabilizing hole walls of boreholes with mud until hole guiding and backfilling operation space meet requirements; (4) removing mud in pile holes by adopting air lifting mud discharge machinery and backfilling pile forming soil; (5) after backfilling is completed and the distance meets the continuous operation requirement of cement mixing piles, digging a mud discharge guideway; (6) arranging a cement mixer in position and constructing a cement mixing pile; and (7) forcibly mixing a residual untreated inlayer part of hole sites of two adjacent hole guiding piles, thus completing construction of waterproof curtain for soil changing mixing. The method is scientific and reasonable in design, simple in process, low in construction cost and safe and reliable in construction, is used for waterproof curtains of deep foundation pits, can sufficiently use common construction machinery, and is good in waterproof effect of a completed waterproof curtain.

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 pebble-based construction method for soil-changing and stirring water-stop curtains. 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, s...

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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