A vacuum grouting device and construction method for bored piles

Abstract

The invention discloses a vacuum grouting device and a construction method for bored cast-in-situ piles. In the device, 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 passes through the vacuum pipe valve and the top of the vacuum pipe. connected; the grouting pump is connected with a grouting valve, and the grouting pump is connected with the top of the grouting pipe through the grouting valve; the bottom of the vacuum grouting pipe is connected with a pile-end grout connecting pipe, a vertical connecting pipe at the pile end, and a horizontal The connecting pipe is provided with a plurality of pipe holes on the horizontal connecting pipe at the pile end. The method includes drilling the cast-in-situ pile to form a hole; expanding the pile end and the pile bottom; cleaning the hole for the first time; making a steel cage and installing a vacuum grouting device; cleaning the hole for the second time; pouring the cast-in-situ pile; maintaining the pile body; Carry out vacuuming to remove water vapor at the pile tip; reinforce the pile tip with grouting; stop grouting; test and accept. The invention improves the effect of grouting at the pile end; makes the grout fully spread around the pile end, increases the bearing area of ​​the pile end, and improves the strength of the soil body at the pile end and the bearing capacity of the pile body.

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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