A prefabricated concrete post-grouting pile and its grouting process

Abstract

The invention discloses a prefabricated concrete post-grouting pile, which comprises a post-grouting pile body, a steel cage skeleton, a flange, a post-grouting groove, a post-grouting pipe, a grouting hole and a pile bottom filler, wherein the steel cage The frame includes longitudinal ribs and surrounding ribs, flanges are welded at one or both ends of the frame, at least one post-grouting pipe runs through the center or side of the frame or both positions, and one end of the post-grouting pipe A grouting hole is provided, the grouting hole is located in the rear grouting groove, and the rear grouting groove is arranged on the rear grouting pile body. During construction, after the above-mentioned post-grouting pile sinks, immediately inject cement slurry or powder slurry with a specific surface area of ​​2500~6500kg / cm2 into the post-grouting pile body through the grouting pipe to ensure that the grouting slurry is compatible with the soil around the pile. The layers are fully bonded. The invention can improve the joint resistance of rock and soil between the soil and the pile, further exert the self-bearing capacity of the pile, reduce the number of piles used, and reduce the engineering cost.

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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