Vacuum grouting device for cast-in-situ bored pile and construction method

Abstract

The invention discloses a vacuum grouting device for a cast-in-situ bored pile and a construction method. A vacuum pump and a grouting pump are arranged on the vacuum grouting device, a vacuum pipe valve is connected to the vacuum pump, and the vacuum pump is connected with the top end of a vacuum pipe through the vacuum pipe valve; a grouting valve is connected to the grouting pump, and the grouting pump is connected with the top end of a grouting pipe through the grouting valve; a pile tip grout connecting pipe, a pile tip vertical communicating pipe and a transverse communicating pipe are connected to the bottom end of the vacuum grouting pipe, and a plurality of pipe holes are formed in the pile tip transverse communicating pipe. The method comprises the following steps of, forming a hole of the cast-in-situ bored pile; enlarging the hole at the pile tip and the pile bottom; cleaning the hole for the first time; manufacturing a reinforcement cage and installing the vacuum groutingdevice; cleaning the hole for the second time; pouring the cast-in-place pile; maintaining the pile body; Vacuumizing the pile tip to remove water vapor at the pile tip; grouting and reinforcing the pile tip; stopping grouting; and carrying out checking and acceptance. According to the vacuum grouting device and the construction method, the pile tip grouting effect is improved; and the grout is fully diffused to the periphery of the pile tip, the bearing area of the pile tip is increased, and the pile tip soil body strength and the pile body bearing capacity are improved.

Description

technical field [0001] The invention relates to the technical field of cast-in-situ pile construction, in particular to a vacuum grouting device and construction method for bored cast-in-situ piles. Background technique [0002] With the rapid development of high-rise buildings and bridges in my country, the requirements for the bearing capacity of building foundations are getting higher and higher. The foundation form generally adopts bored piles, and the bearing layer is required to be a relatively complete rock layer, and the pile diameter is long. Larger size requirements. After years of practice and research, Chinese researchers have used the post-grouting method to solve the problem of insufficient bearing capacity of pile tips when the bearing layer of the foundation is in a non-rock state, and have achieved good economic benefits. Post-grouting method refers to: the grouted steel pipe is hoisted to the bottom of the pile together with the steel cage. After the pile b...

AI Technical Summary

Problems solved by technology

Defects in the construction process of grouting method after bored piles: 1. Excessive water-cement ratio will cause difficulty in grouting, blockage of grouting pipe, and failure to complete subsequent grouting work; too small water-cement ratio will make cement slurry under pressure Under segregation, the strength of the pile tip soil cannot be effectively improved

2. During the grouting process, the grouting will occur along the side of the pile or in other parts. The final effect of the grouting cannot be judged, the end time of the grouting cannot be determined, and the quality of the grouting is difficult to control

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