A Construction Method for Water-stop Curtain with Soil Replacement and Agitation

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 that the patent application number is 201410813752.X, and the title of the patent is the construction method of the water-stop curtain that changes soil and stirs, and the original application date is a divisional application of 2014.12.23. technical field [0002] The invention belongs to the field of water-stop curtains, in particular to a construction method of soil-changing and stirring water-stop curtains. Background technique [0003] During the construction of underground engineering, especially deep foundation pit engineering with higher groundwater level, it is often necessary to arrange water-stop curtains outside the support piles, and water-stop curtains are generally formed by continuous cement-soil mixing piles. When the water-stop curtain encounters difficult geological layers within the designed depth range, such as pebbles, hard sand interlayers and boulders, etc., use conventional cement-soil mixing pile machines, such as two-axis ...

AI Technical Summary

Problems solved by technology

However, during the construction of occlusal piles, the quality and stability of ultra-retarded concrete are extremely high, and the gap between A and B piles of occlusal piles is very prone to leakage due to 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 strata, 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-tightness of the wall, but the TRD construction method is expensive

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