Repair method of unqualified post-grouting bored concrete pile

Abstract

A repair method of an unqualified post-grouting bored concrete pile is characterized by comprising the following steps: a, drilling a plurality of lead holes at the outer side of a bored concrete pile body; b, supplementing a post-grouting pipe at the outer side of the bored concrete pile; c, conducting post-grouting construction; and d, maintaining the bored concrete pile, and inspecting and accepting the bored concrete pile, wherein the posting-grouting construction includes the following steps: (1) providing raw materials of slurry, (2) preparing the slurry, (3) conducting preparation for grouting construction, (4) conducting the first round of grouting, (5) conducting the second round of grouting, and (6) controlling over stop of the grouting. The repair method of the unqualified post-grouting bored concrete pile has the advantages of being reasonable in design of construction steps, easy and convenient to operate, safe and reliable in construction quality, free from influencing the construction period, remarkable in economic benefit, and capable of guaranteeing that a project is implemented smoothly.

Description

technical field [0001] The invention relates to a method for repairing cast-in-place pile foundations, in particular to a repair method for grouted cast-in-situ piles which fail to meet standards. Background technique [0002] Post-grouting cast-in-place piles use the pre-buried grouting pipes at the bottom and sides of the steel cage to pressurize the grout into the concrete through the post-grouting devices installed on the side and bottom of the pile after the concrete pouring pile is formed. Pile side and pile bottom, through the seepage and expansion, splitting, filling, compaction and consolidation of grout, overcome the defects of traditional cast-in-place piles that affect the bearing capacity of cast-in-place piles due to the mud skin around the pile body and the thick sediment at the bottom of the pile, etc. Improve the pile-soil working interface, increase pile side friction resistance and pile end bearing capacity, thereby greatly increasing the ultimate bearing ...

AI Technical Summary

Problems solved by technology

However, due to various geological reasons or construction reasons, the grouting of a small amount of cast-in-place piles fails to meet the design requirements, and the designer needs to check whether the bearing capacity requirements are met. If not, the construction unit needs to formulate a special reinforcement plan and be approved by the design review. , or even re-forming holes and pouring, which will affect the construction period and cause serious economic loss

[0003] Therefore, the known measures to solve the grouting after the cast-in-situ piles fail to meet the design requirements have the above-mentioned inconveniences and problems, and have become a subject for the majority of building rock foundation engineering technicians to think about.

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