UHPC prefabricated special-shaped pile and preparation method thereof

Abstract

The invention discloses a UHPC prefabricated special-shaped pile. The pile comprises a pile body of a hollow cylindrical structure, wherein the pile body is a non-prestressed reinforced concrete pileformed by prefabricating a steel reinforcement framework and UHPC, steel fibers are added into the UHPC, and a plurality of annular force bearing discs used for enhancing the settlement resistance ofthe pile body are further integrally formed on the pile body in the axial direction at intervals; each force bearing disc is an annular convex body which is formed by two loaded inclined planes and afriction surface and has a section of a trapezoidal structure on the pile body, or each force bearing disc is an annular convex body which is formed by two loaded inclined planes and has a section ofa triangular structure on the pile body; and an inclination angle alpha between the lower loaded inclined plane in the two loaded inclined planes and the horizontal plane is 45 degrees. A preparationmethod of the UHPC prefabricated special-shaped pile is simple in process, traditional tensioning and releasing process links are not needed, and the problem that in the releasing process of a traditional process, a steel mold cannot follow pile body compression deformation and steel mold manufacturing is solved.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a UHPC prefabricated special-shaped pile and a preparation method thereof. Background technique [0002] Larger settlements in foundation engineering, especially uneven settlements, can easily lead to large secondary internal forces in the original statically indeterminate structure, causing cracking or even destruction of the structure. Especially in soft soil areas, there are higher requirements for the anti-settling ability of pile foundations. For friction piles, it is often necessary to increase the pile length to obtain greater friction resistance, which greatly increases the cost. Traditional tubular piles, square piles and other cross-sections are difficult to effectively exert the high-strength performance of the pile body in soft soil areas, and cannot provide a large mechanical bite force and frictional resistance. At the same time, the hammering and static ...

AI Technical Summary

Problems solved by technology

In the prior art, the protruding part of the pile body of this kind of prefabricated pile is fixed in the groove of the inner wall of the steel film, so it cannot follow the deformation of the pile body during the stretching process, and it is easy to generate cracks between the pile body and the protruding part of the pile body. even fall off

In order to solve this problem, only CN102825658 B prestressed concrete special-shaped piles with double-walled steel molds for internal and external molds can only be used, which is difficult to manufacture and more expensive, and the protrusion height of the prefabricated pile body is limited.

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