Pile bottom mud jacking method for pump-grouting concrete and structure of madjack pipe

Abstract

The invention relates to a method for compressing slurry at the post bottom when concrete drilling hole and irrigating post and a relative structure of compressing tube, wherein it at least arranges tow straight tubes at the steel bar cage; the lower end or part of straight tube is connected to a bended tube to form compressing tube; the bended direction of bended tube is toward to the center of post; and the part of said bended tube downward is mounted with compressing hole packed with rubber sheath; another end of bended tube is sealed by annular steel plate; the upper end of straight tube is mounted with water inlet valve to connect the water inlet tube; in 5-10 hours when the underwater concrete is irrigated, the pressure water is compressed into the straight tube; the rubber sheath at the bottom of bended tube is cracked; and the compressing tube is filled with water before compressing slurry; when the post is detected via ultrasonic wave, starting to compress slurry; only using one compressing tube to compress some cement slurry at each time, then compressing with another compressing tube, until all cement slurry is compressed. The invention can improve the support ability of base post.

Description

technical field [0001] The invention is applied in the construction of concrete bored piles, the method for grouting the bottom of concrete bored piles with various diameters and lengths and the structure of the grouting pipe. Background technique [0002] In the construction of concrete bored piles, the first pouring of concrete will squeeze the sediment impurities in the borehole to the edge of the hole, and often produce defects at some parts of the pile bottom, thus reducing the bearing capacity of the pile. In order to solve this problem, after the concrete is poured, a grouting process is also used, that is, the grouting method is used to fill these parts without concrete. Most of the existing techniques for grouting the bottom of the concrete bored piles adopt open grouting and circulation grouting methods. [0003] The process of open grouting is to fix the grouting tube on the steel cage, the grouting tube is located on the four sides of the pile, and the grouting ...

AI Technical Summary

Problems solved by technology

Although this process can control the flow direction of the grout at the bottom of the pile, the U-shaped grouting pipe must be cleaned after each grouting. In large-scale concrete bored piles, the amount of cleaning grout is greater than the amount of pressing in, and the environment of the platform is seriously polluted. ; And the U-shaped tube uses a large amount of steel, resulting in higher costs

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