A hybrid prestressed concrete-filled steel tubular pile

Abstract

The invention relates to a hybrid pre-stress steel pipe concrete pile comprising a concrete pile body, a steel reinforcement cage built in the concrete pile body, and a steel pipe wrapping partial the concrete pile body; the innovation points are that an inner wall of an orifice of the steel pipe is provided with an inner groove extending to the end face of the orifice; or, an axial connecting portion between the steel pipe and the concrete pile body is provided with a transition pipe; one end orifice of the transition pipe is welded and fixed with the steel pipe, and the inner wall of the other end orifice is provided with an inner groove extending to the end face of the orifice; the advantages are that the orifice of the steel pipe or the inner wall of the transition pipe orifice are provided with the inner groove extending to the end face of the orifice; the inner groove is arranged on the steel pipe or the end face of the transition pipe orifice, thus greatly reducing thickness, reducing an axial contact surface between the steel pipe or the transition pipe and the concrete pile body, and weakening cracking formation.

Description

technical field [0001] The invention relates to a pipe pile, in particular to a hybrid prestressed steel pipe concrete pile. Background technique [0002] With the development of concrete technology, the technology of concrete pipe piles is becoming more and more mature. In addition to being used in industrial and civil buildings, it is also widely used in various fields such as bridges, ports, railways or water conservancy projects. [0003] Prestressed high-strength concrete pipe piles (PHC pipe piles) adopt the pre-tensioned prestressed centrifugal forming process, which is widely used due to the advantages of high single pile bearing capacity and reliable pile quality, but the manufacturing cost is relatively high. The new thin-walled steel pipe centrifugal concrete pipe pile, referred to as TSC pile, is similar in appearance to the commonly used PHC pile, but its internal structure is different. The outer shell of the TSC pile is a thin-walled steel pipe with a thickne...

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Problems solved by technology

[0005] But there are also certain defects: in the manufacturing process, due to the difference in the expansion coefficient of the steel pipe and the concrete, cracks will occur at the joint between the steel pipe 2 and the concrete pile body 1 in the axial direction, and the cracks even run through the entire pile body The radial surface of the product does not meet the quality standards of the product, and the pass rate is low

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