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

Abstract

The invention is applied to the construction of concrete bored piles, a method for grouting the bottom of concrete bored piles and a structure of a grouting pipe. At least two straight pipes are evenly fixed on the reinforcement cage, and the lower end or lower part of the straight pipe is connected with a bent pipe to form a grouting pipe. The slurry hole is wrapped with a rubber sleeve; the other end of the elbow is closed with a ring-shaped steel plate; the upper end of the straight pipe is connected to the water inlet by installing a water gate valve; within 5 to 10 hours after the underwater concrete pouring of the bored pile is completed, the pressure water is discharged from the straight pipe Press it in, and the rubber sleeve at the bottom of the elbow cracks; keep the grouting pipe filled with water before grouting; after the pile body passes the ultrasonic inspection, start grouting at the bottom of the pile; only one grouting pipe is used to press in a certain amount each time. Cement slurry, and then carry out quantitative grouting with another grouting pipe, and proceed in sequence until the total amount of grout is pressed. The post-grouting process of the bored pile end of the invention greatly improves the bearing capacity of the foundation pile.

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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