Replaceable press-grouted cement soil composite pile, construction method of replaceable press-grouted cement soil composite pile and long twist drill employed in construction method

Abstract

The invention discloses a replaceable press-grouted cement soil composite pile which comprises a replaceable cement soil layer and a core pile, wherein the core pile is vertically distributed in the center of the replaceable cement soil layer; the replaceable cement soil layer comprises cement, soil, building rubbish, coal cinder, slag and/or factory waste; and the raw materials of the replaceable cement soil layer stay in a superfluid state when injected into a pile hole initially. The invention further discloses a construction method of the replaceable press-grouted cement soil composite pile, which comprises the following steps: (1) enabling the drill rod of a long twist drill to drill to a design pile bottom level, and making superfluid cement soil slurry of soil which is taken out during drilling; (2) spirally lifting up the drill rod while performing press-grouting; and (3) placing the core pile in the cement soil slurry in the pile hole from the center of a steel sleeve. The invention further provides the long twist drill. The composite pile made according to the construction method has the beneficial effects of high bearing capacity, no waste slurry discharge and no soil compaction effect.

Description

technical field [0001] The invention relates to the field of building foundation engineering, in particular to a replacement pressure grouting cement-soil composite pile. The invention also relates to a construction method of a displacement pressure grouting cement-soil composite pile. The present invention also relates to a long auger drill used in the above construction method. Background technique [0002] The structure of the cement-soil composite pile is that the outer layer is cement-soil, and the inner layer is a high-strength core pile. At present, the main method of domestic cement-soil formation is to mix the prefabricated cement slurry with the foundation soil by using high-pressure rotary spraying method or deep mixing method. Due to the limitation of stratum changes and construction technology, the cement soil formed by the above method has low strength and poor uniformity, thus affecting the bonding force between the core pile and cement soil, reducing the...

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention also includes providing a construction method of the above-mentioned displacement pressure-grown cement-soil composite pile, the displacement-type pressure-grown cement-soil composite pile made by the method can ensure various quality indicators of cement-soil, and can improve the quality of the composite pile. Bearing capacity, no lateral squeezing effect and mud discharge, can solve the problem of pile length limitation in deep soft foundations, especially suitable for applications in strata with high groundwater levels and prone to instability

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