A kind of construction method for strengthening and strengthening karst cave of underground pile foundation

Abstract

The invention discloses a strengthening and reinforcing mountain piling construction method for an underground pile foundation cavern. The strengthening and reinforcing mountain piling construction method comprises the steps that (1), advanced drilling is conducted, specifically, the cavern situation of a site is displayed according to survey data of a project, advanced drilling is conducted before pile forming, and the advanced drilling depth should be drilled till the cavern situation below the pile bottom is proven; (2), hole forming is conducted, specifically, a pile hole is formed in thedesign elevation of the pile bottom; (3), deep drilling is conducted, specifically, a miniature steel pipe is drilled to the cavern bottom; (4), mountain piling is conducted, specifically, mountain piling comprises dredging, discharging for stacking and filling, grouting for consolidation and re-inspection; and (5), pile forming is conducted, specifically, the miniature steel pipe penetrates through a filler pile to be driven to the cavern bottom, a made steel reinforcement cage is put into the pile hole, pile body concrete is poured into a pile, and construction is completed. According to thestrengthening and reinforcing mountain piling construction method, the harm of the underground pile foundation cavern can be safely, quickly, economically, thoroughly and effectively treated, the construction safety and the pile forming quality of the project pile are guaranteed, and the bearing capacity and anti-deformation requirements of the structure are met.

Description

technical field [0001] The invention relates to a method for treating karst caves, in particular to a construction method for strengthening and reinforcing karst caves for underground pile foundations. Background technique [0002] With the continuous acceleration of urbanization in our country, the construction of urban infrastructure has been further developed, and the number of high-rise buildings is increasing, which puts forward higher requirements for the quality and safety of pile foundation construction. In the process of pile foundation construction, it is not uncommon to encounter bad geology of karst caves. Since pile foundation construction is an underground concealed project, karst caves bring great difficulties to pile foundation construction. If reasonable treatment is not carried out, there will be the following hazards : [0003] (1) Collapsed hole: The hole wall is unstable and collapsed, and accidents such as stratum subsidence, damage to pile driving too...

AI Technical Summary

Problems solved by technology

[0003] (1) Collapsed hole: The hole wall is unstable and collapsed, and accidents such as stratum subsidence, damage to piling equipment, damage to additional buildings or underground pipelines, and even casualties may occur

[0004] (2) For broken piles of engineering piles, during the process of pouring concrete, if the concrete flows out due to underground karst caves, the integrity of the pile body concrete will be destroyed, and pile breaking accidents will occur

[0005] (3) Inducing geological disasters: The continued development of soil karst caves will cause uneven settlement or karst ground subsidence, induce geological disasters, affect the safe use of buildings, and even pose a threat to people's lives and property

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