Construction method of steel casing high pressure water injection to loosen soil and pull out piles

Abstract

A construction method for steel casing high-pressure water injection to loosen soil and pull out piles, including: sinking the outer casing and the inner casing with the water injection pipe into the soil under the vibration of a high-frequency vibrating hammer; A high-pressure water injection hole; high-pressure water injection is carried out while the pile is vibrating, and the old pile and the mud around the pile gradually enter the inner casing; the old pile is pulled out; the old pile hole is backfilled; the outer casing and the inner casing are pulled out by vibration. The invention can ensure little or no soil squeezing during the construction process, so the soil squeezing effect will not occur; and the frictional resistance of the old pile body can be greatly reduced, and the old pile can be easily pulled out by a pile extractor; the pile body is avoided The frictional resistance is too large to pull out the old pile or the old pile is pulled out due to too much pulling force.

Description

technical field [0001] The invention relates to the field of engineering construction, in particular to a construction method for steel casing high-pressure water injection to loosen soil and pull out piles. Background technique [0002] The old city renovation project will inevitably encounter the problem of the influence of the old building pile foundation on the new building pile foundation construction. In order to avoid the adverse impact of the old pile foundation on the new pile foundation construction on the site, it is generally necessary to Pull out the old piles at the new pile foundation position for subsequent construction. The existing pile extraction technology generally adopts the method of smashing and smashing, using a heavy hammer to smash the pile foundation, and then dig out the waste residue, which is time-consuming and labor-intensive, and damages the environment. Existing pile extractors have limited ability to extract piles, mainly due to flaws in t...

AI Technical Summary

Problems solved by technology

The existing pile extraction technology generally adopts the method of smashing and smashing, using a heavy hammer to smash the pile foundation, and then dig out the waste residue, which is time-consuming and labor-intensive, and damages the environment

Existing pile extractors have limited ability to extract piles, mainly due to flaws in the design of the fixture. It is difficult to control the tightness during the extraction process. If it is too tight, it will easily pinch the pile foundation, and if it is too loose, it will not be able to pull it out, which has become a problem. big problem

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