Forming method of composite foundation pile and grouting member of composite foundation pile

Abstract

The invention relates to a forming method of a composite foundation pile. The forming method comprises the steps that (1) the position of the foundation pile is selected; (2) a soil body is mixed withcement slurry to form cement soil by a method of spraying the cement slurry and stirring while drilling or a method of spraying the cement slurry and stirring after the completion of drilling at theselected position; (3) a precast pile is lowered into the cement soil; and (4) after predetermined curing time, the cement slurry is injected again into a gap between the outer surface of the precastpile and the cement soil. The forming method enables a shrinkage joint generated due to shrinkage in the solidification process of the cement soil to be filled, ensures reliable contact between the cement soil and the precast pile, or enables the cement soil to be in reliable contact with the precast pile through the subsequently poured cement slurry, thereby ensuring that the composite foundationpile has sufficient bearing capacity and pull-out resistance, and eliminating the engineering quality hidden danger caused by the shrinkage joint. The invention further relates to a grouting member of the composite foundation pile.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a forming method of a composite foundation pile and a grouting component of the composite foundation pile. Background technique [0002] Deep-stirring cement-soil pile is an effective form of soft foundation treatment at present. It uses cement as the main agent of curing agent, and uses a mixing pile machine to spray cement into the soil and then fully mixes with the soil. A series of physical and chemical reactions harden the soft soil. In order to further enhance the bearing capacity of the deep-mixed cement-soil pile, a composite foundation pile has also appeared. Putting it into the pile hole of the mixture of soil and cement, after the mixture is solidified, the periphery of the prefabricated pile and the consolidation layer formed by wrapping the cement and the bottom of the pile after mixing with the soil, the bearing capacity of this kind of composite pile foun...

AI Technical Summary

Problems solved by technology

[0003] However, this kind of composite foundation pile has the following technical problems: after the construction is completed, the soil pile formed by mixing cement and soil will gradually condense, and the soil pile will shrink significantly during the condensing process, while the prefabricated pile will not shrink due to its own strength. Higher, and prefabrication has been completed in the factory, so the shrinkage rate and expansion rate of the prefabricated piles are very small, basically negligible, which makes the separation between the soil piles and the prefabricated piles that are originally close together

[0004] As we all know, most of the bearing capacity of the pile itself comes from the friction between the pile body and the surrounding matrix, especially the pull-out resistance of the pile, which is more dependent on the friction between the pile body and the surrounding matrix. After the prefabricated piles are separated, the bearing capacity of the composite foundation piles will be greatly reduced, which will cause serious safety hazards to the quality of the project

Images