Grouter for back side grouting and its construction method

Abstract

The invention relates to a pile side post-grouting grouting device and the construction method thereof, including a ground grouting device and an underground grouting device; the underground grouting device is composed of a pile body grouting guide pipe and an inner pile grouting device; both ends of the pile body grouting guide pipe are connected with the ground conveying pipe and the pile side grouting device; the pile body grouting guide pipe is distributed along the grouting section, fixedly bound with the main rib of the steel reinforcement cage and is arranged in a drilled hole togetherwith the steel reinforcement cage; the pile side grouting device is composed of an annular high-pressure hose and a grouting device; the annular high-pressure hose is communicated with the pile body grouting guide pipe and is fixedly connected with the bored pile steel reinforcement cage. During the pile forming process of the bored pile, the pile side post-grouting grouting device and the construction method prearrange the grouting pipelines on a plurality of positions on the pile body, distribute the annular high-pressure hose outside the grouting section and mount the grouting device; a high-pressure grouting pump is adopted when pile body concrete reaches certain strength; the cement grout is injected into the pile lateral through the grouting pipelines to improve the pile lateral mudcover; the pile lateral soil mass intensity is improved at the same time, so as to improve the bearing capacity of the pile and reduce the skirt pile settlement.

Description

technical field [0001] The invention relates to a grouting device specially used for post-grouting in the construction of bored piles and a construction process thereof, in particular to a grouting device for post-grouting on the pile side and a construction process thereof. Background technique [0002] The total area of ​​the "Shanghai Center" project base is about 30,368.27 square meters, and the total construction area is about 430,000 square meters. The proposed main building is about 580 meters high, which is a super high-rise skyscraper. The foundation pit is a first-class deep foundation pit. [0003] In order to consolidate the soil around the pile, increase the bearing capacity of the single pile and reduce the settlement of the skirt pile, the test piles of this project will be post-grouted on the side of the pile. Set 4 grouting sections within the pile length, the number of grouting holes in each section is not less than 4, and the cement consumption of each gr...

AI Technical Summary

Problems solved by technology

[0004] At present, there is still a lack of mature pile side grouting experience and corresponding equipment, so it is necessary to introduce special high-strength composite pipes for processing annular grouting pipe valves

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