Cast-in-place pile post-grouting construction technology

Abstract

The invention provides a cast-in-place pile post-grouting construction technology. The technology comprises the following steps that at least two first grouting pipes are circumferentially arranged onthe pile side along the outer side of a reinforcement cage, at least two second grouting pipes are arranged at a pile end, and the first grouting pipes and the second grouting pipes are connected with a grouting device separately; cement slurry needing to be grouted is prepared; when the concrete strength reaches 10-15 Mpa, a grout pump is adopted for opening the first grouting pipes and the second grouting pipe; when the concrete strength reaches 50%-75% of a design value, the prepared cement slurry is subjected to secondary grouting through the first grouting pipes and the second grouting pipes; the quality of secondary grouting is inspected and accepted. According to the post-grouting construction technology, the pile end supporting layer and the pile side condition can be effectivelyimproved, the pile end resistance and pile side frictional resistance are improved, the load transmitting property is improved, the single pile bearing capacity is greatly increased, the settling volume is reduced, it is guaranteed that the grouting process is performed smoothly, and the grouting quality is improved.

Description

technical field [0001] The invention relates to a post-grouting construction technology of cast-in-situ piles. Background technique [0002] Cast-in-situ piles have been widely used in construction projects because of their high bearing capacity and strong applicability, but the defects of cast-in-place piles will also cause insufficient bearing capacity of single piles due to certain reasons. Post-grouting technology is an auxiliary process for the construction of cast-in-place piles, which can effectively make up for the defects of cast-in-place piles and improve the bearing capacity of single piles. Post-grouting at the bottom of cast-in-place pile refers to: when the concrete of the pile body reaches a certain strength after the concrete pouring pile is formed, the cement slurry is injected into the bottom of the pile under pressure through the post-grouting equipment, and through the permeation, splitting and filling of the cement slurry , compaction and consolidation,...

AI Technical Summary

Problems solved by technology

However, since the grouting pipe and the steel cage are fixed together, it is easy to drive the grouting pipe to float up due to the floating of the steel cage, which affects the smooth progress of the grouting and leads to the failure of the grouting

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