Precast concrete post grouting pile and grouting process

Abstract

The invention discloses a precast concrete post grouting pile which comprises a post grouting pile body, a reinforcement cage framework, flanges, a post grouting tank, a post grouting pipe, a grouting hole and a pile bottom filler, wherein the reinforcement cage framework comprises longitudinal ribs and surrounding ribs; one end or two ends of the framework are welded with the flanges; at least one post grouting pipe runs through the center or the side edge position of the framework or the center and the side edge position of the framework; one end of the post grouting pipe is provided with the grouting hole; the grouting hole is positioned in the post grouting tank; and the post grouting tank is arranged on the post grouting pile body. In the constructing process, the post grouting pile is sunken and immediately, cement paste or powder paste with a specific surface area of 2,500 to 6,500kg/cm<2> is injected into the post grouting pile body by the grouting pipe, so that sufficient adhesion of the grouted paste and a soil layer around the pile is ensured. The precast concrete post grouting pile can realize improvement on rock and soil common resistance of soil and the pile so as to further play bearing capacity of the pile; and meanwhile, the number of the used piles can be reduced and engineering cost is reduced.

Description

technical field [0001] The invention relates to a construction pile foundation material in the field of civil engineering, in particular to a prefabricated concrete post-grouting pile and a grouting process. Background technique [0002] The natural resources used for construction are becoming less and less, that is, the land is becoming more and more scarce, and the construction of civil projects is characterized by deep underground and high upper parts, and the requirements for natural foundations are getting higher and higher. Considering the safety of the project, engineering designers are becoming more and more cautious in the selection of pile types. At present, the concrete piles prefabricated in the factory mainly include prestressed concrete pipe piles, prestressed concrete hollow square piles, solid square piles, bamboo piles, steel pipe piles, steel pipe concrete piles, etc. The above pile foundation materials have high bearing capacity and convenient construction...

AI Technical Summary

Problems solved by technology

This type of pile can improve the bearing capacity of friction piles less, because it only uses grouting at the bottom of the pile, and only the grouting pipe is pre-embedded in the center of the pile, and most of the injected grout is in the center of the pile. Bottom, the slurry is difficult to distribute on the side of the pile

The patent number is: ZL201220088468.7, the name is "a kind of post-grouting concrete prestressed hollow square pile" and the patent number ZL20220080923.9, the name is "a kind of post-grouting concrete prestressed hollow square pile". "The grouting pipe is pre-embedded during the prefabrication process of post-grouting concrete prestressed hollow square piles, and the grouting process can be carried out after the pile sinking construction of the pile foundation is completed." Since the prestressed hollow square piles are formed by centrifugal technology, the pre-embedded The grouting pipe is easy to deviate or even dislocate during high-speed centrifugation

In addition, because it needs 5-9 hours of high-pressure steam curing after centrifugal molding, the requirements for the material of the embedded pipe are relatively high, and it is difficult for the embedded pipe of ordinary materials to withstand high temperature and high pressure for a long time.

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