Construction method for vibrator pipe sinking high-pressure grouting underpinning pile extracting

Abstract

The invention discloses a construction method for vibrator pipe sinking high-pressure grouting underpinning pile extracting, which is characterized by comprising the following steps: vibrating and sinking a steel sleeve; grouting and stripping a pile body and peripheral soil body; extracting the pile; and grouting and underpinning. Compared with the prior art, the construction method has the advantages of small pile extracting force by only considering the self-weight of the pile body, low vibration noise, complete elimination of underground obstacles, and no hidden dangers remaining in subsequent pile foundation construction, great improvement on the bearing capacity of the foundation soil, and no influence on the peripheral environment. Meanwhile, the construction method has convenient construction and high working efficiency, and is a resource-saving and environment-friendly construction method.

Description

technical field [0001] The invention relates to pile foundations of building structures, in particular to a construction method for removing old structures and building pile foundations by vibrating immersed tubes and high-pressure grouting for underpinning and pulling out piles. Background technique [0002] At present, in the foundation and foundation construction of old building renovation projects, the removal of prefabricated piles, cast-in-place piles, steel piles and Wooden stakes etc. Punch grab method: Use a heavy hammer to crush underground obstacles (pile bodies), and then grab the debris with a grab bucket. The disadvantages of the punch grab method are: large vibration and noise, long construction period, and high cost. Strong hoisting method: Large-tonnage cranes and other lifting equipment are used to forcibly lift and pull out. The disadvantage of the strong hoisting method is that underground obstacles are often pulled out, and underground piles cannot be c...

AI Technical Summary

Problems solved by technology

Punching and grabbing method: use a heavy hammer to crush underground obstacles (pile bodies), and then grab the debris with a grab bucket. The disadvantages of the punching and grabbing method are: large vibration and noise, long construction period, and high cost

Strong hoisting method: Large-tonnage cranes and other lifting equipment are used to forcibly lift and pull out. The disadvantage of the strong hoisting method is that underground obstacles are often pulled out, and underground piles cannot be completely removed, leaving hidden dangers for future construction.

Immersed tube water injection method: use mechanical power to pressurize the steel pipe, inject water to replace the soil around the pile foundation, and then lower the steel wire rope to lift the pile to be pulled out. This construction method uses water to replace the soil around the pile foundation, and the soil in the soil Debris such as sand grains sink to the bottom of the pile due to its own weight, causing the lifting wire rope to fail to lower to the design position, and pile extraction is prone to failure

[0003] The above methods of construction, after clearing the obstacles, generally use muck to backfill the hole, because the backfill is looser than the natural compact soil, which affects the bearing capacity of the foundation soil and the subsequent pile foundation construction, which is easy to cause pile position deviation

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