Construction method for the treatment of pile body collapse hole or pile bottom sediment quality defect of rotary excavated cast-in-place pile

Abstract

The invention provides a construction method for pile body hole collapse or pile bottom sediment quality defect treatment of a rotary excavating filling pile. The method comprises the steps of performing high-pressure steam cutting and water lifting deslagging hole clearing; performing grouting hole sealing or installing a grouting pipe; preparing cement grout; performing self-compaction normal pressure or low pressure grouting; performing high-pressure grouting, grout supplementation and final pressure; embedding steel bars to reinforce a pile body hole collapse defect part; and performing foundation pile recheck. According to the construction method, not only is reinforcement treatment performed on pile body defects, but also grout is also immersed in gaps between the pile body and surrounding soil and is even immersed in cracks of the soil around the pile body, frictional resistance of pile soil and strength of the soil around the pile are improved, and thus the bearing capacity of a foundation pile. The process operation is simple, a hole is cleared clean, the speed is quick, the cost is low, the grouting range is large, the strength is high, and a defect treatment effect is good.

Description

technical field [0001] The invention belongs to a construction method for the treatment of the quality defect of the pile body collapse hole or pile bottom sediment of a rotary excavation grouting pile, specifically through high-pressure water gas cutting-air lift slag removal-hole washing-self-compacting atmospheric pressure grouting-high pressure Grouting - the construction method of implanting finished high-strength rebar in the grouting hole (the finishing-rolled high-strength rebar does not need to be implanted when dealing with sediment) is used to reinforce the collapsed hole of the pile body or the sediment defect at the bottom of the pile, and finally achieve the purpose of dealing with the defect . Background technique [0002] Due to the many construction links and complex processes of rotary excavation piles, and there is no unified construction specification at present, there are many uncertainties in the quality of piles, and various quality defects are prone t...

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Problems solved by technology

[0002] Due to the many construction links and complex processes of rotary excavation piles, and there is no unified construction specification at present, there are many uncertainties in the quality of piles, and various quality defects are prone to occur. In severe cases, the bearing capacity of the pile body will be significantly reduced, and even fracture Major quality accidents such as piles

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