A pile recovery method of steel pipe slope protection piles

Abstract

The invention discloses a formed pile recycling method for a steel pipe slope protection pile. The formed pile recycling method comprises the following steps that a concrete wall protecting pipe and aPVC wall protecting pipe are distributed in a set pile hole, a retaining wall is formed inside the pile hole, the pile hole can be prevented from collapsing when the steel pipe slope protection pileis hoisted, meanwhile the surrounding stratum pressure can be well resisted in the process of pulling out a steel pipe, and the stratum loss is reduced; and cement slurry is poured into a gap betweenthe steel pipe slope protection pipe and the wall protecting pipe, the poured cement slurry can form a cement rock wall after hardening in the wall protecting pipe, and the effects that the wall protecting pipe is thickened and is in complete contact with the steel pipe slope protection pile so that the cement rock wall can be work together with the steel pipe slope protection pile, the surrounding stratum pressure is resisted, and the stratum loss is reduced are realized. By the adoption of the method, the bonding resistance between the steel pipe pile and cement stones during the pulling-outprocess of the steel pipe slope protection pile can be reduced, the pulling-out process is more smooth, meanwhile the effect of causing the fatigue damage to the cement stones outside the steel pipeis realized, the wall protecting pipe is prevented from moving up along with the steel pipe slope protection pile during the pulling-out process, and the deformation of a surrounding building is reduced.

Description

technical field [0001] The invention belongs to the technical field of civil engineering construction, and is mainly used in the pile recovery process of recyclable steel pipe slope protection piles. Background technique [0002] In the process of foundation pit construction of urban buildings, recyclable steel pipe slope protection piles have appeared in the support process of foundation pit engineering as a new type of support. The recyclable steel pipe slope protection pile occupies a small space during construction, and its own rigidity is high, and the components are all manufactured in the factory. The quality is relatively reliable, and the construction time on site can be shortened, which saves the construction period and can be recycled repeatedly. take advantage of. [0003] However, there are still problems to be solved in the construction process of recyclable steel pipe slope protection piles: (1) How to reduce the formation loss caused during the pull-out proc...

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Problems solved by technology

[0004] This method is based on the support method of recyclable steel pipe slope protection piles. Concrete wall protection pipes and PVC wall protection pipes are used as the outer wall protection pipes of steel pipe piles, butter + stretch film is used as the external isolation material of steel pipes, and cement slurry is used as the steel pipe slope protection pile and wall protection pipes It is a recyclable steel pipe slope protection pile pulling pile recovery method, which mainly solves the following technical problems: (1) High-efficiency isolation and drag reduction technology between the steel pipe slope protection pile and the cement slurry

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