Remedying and reinforcing method for precast hollow driven piles

Abstract

The invention discloses a remedying and reinforcing method for precast hollow driven piles. The method includes the first step of checking, calculating and determining construction parameters of the single-pile allowable bearing capacity P and construction parameters of the foundation settlement S after remediation and reinforcement, the second step of carrying out statistics on defective precast hollow driven piles in a foundation reinforcement range according to a design drawing, then carrying out field measurement and location and making marks, and the third step of installing a drilling machine on a designated position of one precast driven pile, enabling a drill pipe to penetrate through the hollow portion of the precast driven pile and then starting drilling, wherein the drill pipe must keep vertical in the drilling process, the precast driven pile must be reinforced at an expected depth, and the like. Through the method, the bearing capacity and the settlement of the defective precast hollow driven piles can meet requirements of a project, and the construction quality can be easily ensured, so the remedying and reinforcing method for the precast hollow driven piles has good practical value on the project.

Description

technical field [0001] The invention relates to the field of foundation reinforcement, in particular to a remedial and reinforcement method for prefabricated hollow driven pile foundations. Background technique [0002] Prefabricated reinforced concrete hollow driven pile has many advantages such as simple manufacturing process, easy quality assurance, relatively cheap cost, fast construction speed and high bearing capacity, so it has been widely used in foundation reinforcement projects. Prefabricated hollow driven piles are mainly constructed by hammering method or static pressure method. Due to the uncertainty of the spatial distribution characteristics of the foundation soil, during the construction process, if the local hard layer is too thick or there are boulders that are not easy to penetrate When the interlayer is hard, the prefabricated hollow driven pile cannot enter the predetermined bearing layer, that is, it can only drive to the actual penetration position of ...

AI Technical Summary

Problems solved by technology

Prefabricated hollow driven piles are mainly constructed by hammering method or static pressure method. Due to the uncertainty of the spatial distribution characteristics of the foundation soil, during the construction process, if the local hard layer is too thick or there are boulders that are not easy to penetrate When the interlayer is hard, the prefabricated hollow driven pile cannot enter the predetermined bearing layer, that is, it can only drive to the actual penetration position of the defective prefabricated driven pile, and cannot drive to the designed penetration position of the defective prefabricated driven pile, especially under the hard interlayer When there is a weak underlying layer, the bearing capacity or settlement of the foundation will not meet the expected control standards; since the prefabricated hollow driven piles are mostly prefabricated in sections according to the designed pile length in the factory, if the penetration reaches the design depth during the construction process If it is too large, it will also cause the bearing capacity or settlement of the foundation to fail to meet the expected control standards; the above situations need to take reasonable measures to remedy or reinforce. The existing defective piles cannot be used, resulting in a significant increase in engineering investment, and the problem of insufficient bearing capacity of the foundation and settlement control cannot be solved at the same time

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