Ground treatment method when there is residual old pile foundation during building construction

Abstract

The invention relates to a foundation treatment method adopted when an old residual pile foundation exists during building construction. The method comprises the steps that 1, a newly-built foundation bottom face is adopted as a base, and overexcavation is carried out towards the lower portion and the two sides; 2, the old pile foundation exposed after overexcavation is chiseled away through a concrete chiseling machine, and exposed steel bars in an old pile are cut away through electrical welding; 3, after the ground obtained after overexcavation is leveled, gravel refilling is carried out, graded gravel with the maximum particle size of 50 mm is adopted for refilling, refilling gravel layers are ground by a vibrating roller layer by layer, the thickness of each layer is 200-300 mm, and the degree of compaction of the refilling gravel layers is not smaller than 0.97; 4, foundation pad layers are laid on the refilling gravel layers, and the strength grade of concrete is not lower than C10; and 5, newly-built foundation construction is carried out above the foundation pad layers. Under the condition of meeting foundation bearing capacity, the functions of adjusting the foundation bearing state and preventing differential settlement through an artificial mattress formed by the refilling gravel layers are achieved; and by means of the structure, construction difficulty can be greatly lowered, the construction progress can be accelerated, and a large amount of project investment can be saved.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a foundation treatment method when old pile foundations remain during building construction. Background technique [0002] In the process of rebuilding the old factory area, it is often encountered that the old building (structure) foundation remains in the building foundation. In the construction of the new building foundation, the usual practice is to remove all the old foundation first. When the old foundation is a concrete independent foundation or block foundation, it is easy to remove because the independent foundation or block foundation is buried shallow; but when the old foundation is a pile foundation, it is very difficult to remove because the pile is inserted deeply into the foundation soil. Usually the remaining old piles are not under the foundation of the whole building (such as figure 1 As shown), if the old piles are cut off and the new foundation ...

AI Technical Summary

Problems solved by technology

When the old foundation is a concrete independent foundation or block foundation, it is easy to remove because the buried depth of the independent foundation or block foundation is shallow; but when the old foundation is a pile foundation, it is very difficult to remove because the pile is inserted deeply into the foundation soil

Usually the remaining old piles are not under the foundation of the whole building (such as figure 1 As shown), if the old piles are cut off and the new foundation construction is directly carried out on them, because there are piles under the partial foundation, the foundation of the building will have uneven settlement; if all the old piles are removed, the construction difficulty will be greatly increased , will not only extend the construction period, but also greatly increase the project investment

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