Method and structure for eliminating frictional resistance of side face of cast-in-place pile

Abstract

The invention discloses a method and structure for eliminating frictional resistance of the side face of a cast-in-place pile, and belongs to the technical field of building construction. The method comprises the steps: an inner steel sleeve and an outer steel sleeve are adopted in an empty pile part, and a gap between the inner sleeve and the outer sleeve isolates contact between an underground soil layer and a pile body to eliminate the pile side frictional resistance caused by the pressure of the soil layer; the diameter of the inner sleeve is the same as the diameter of the pile, and the diameter of the outer sleeve is larger than that of the inner sleeve; the inner sleeve serves as a cast-in-place pile concrete formwork; and the outer sleeve serves as the soil pressure supporting theside wall, and the gap of the inner sleeve and the outer sleeve isolates the side face soil pressure. The structure for eliminating the frictional resistance of the side face of the cast-in-place pilecomprises a design pile part and the empty pile part, the empty pile part is provided with the inner sleeve and the outer sleeve, and the inner sleeve has the same diameter as the design pile and serves as the cast-in-place pile concrete formwork; and the diameter of the outer sleeve is larger than that of the inner sleeve, and the gap is formed between the outer sleeve and the inner sleeve. Thefrictional resistance of the empty pile part of the tested pile can be eliminated, and the problems of construction and detection of the tested pile under the conditions of large burying and deep foundation pit are solved.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a method and a structure for eliminating the side friction resistance of cast-in-place piles. Background technique [0002] In building construction, when the bored piles are buried deep and the foundation pit is deep, the general test pile construction and bearing capacity need to be carried out on the ground, and the design pile is extended to the ground, and the frictional resistance of the side of the pile body of the empty pile is bound to be will affect the accuracy of detection. The usual practice is to use the "estimation discount method" to subtract the frictional resistance of the empty pile part, which not only reduces the accuracy of the detection value, but also increases the project cost if a "conservative" value is adopted to design the bearing capacity of a single pile. Contents of the invention [0003] The technical task of the present invention...

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Problems solved by technology

[0002] In building construction, when the bored piles are buried deep and the foundation pit is deep, the general test pile construction and bearing capacity need to be carried out on the ground, and the design pile is extended to the ground, and the frictional resistance of the side of the pile body of the empty pile is bound to be will affect the accuracy of detection

The usual practice is to use the "estimation discount method" to subtract the frictional resistance of the empty pile, which not only reduces the accuracy of the detection value, but also increases the project cost if the "conservative" value is adopted to design the bearing capacity of a single pile

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