Insertion opening crack resisting structure for prestressed concrete cylinder pipes and manufacturing method of structure

Abstract

The invention discloses an insertion opening crack resisting structure for prestressed concrete cylinder pipes (PCCPs) and a manufacturing method of the structure, and belongs to the technical field of composite concrete pipes. The insertion opening crack resisting structure for the PCCPs comprises a deformation joint reserved on the outer side of an insertion-opening-end special-shaped steel ring, a thin steel ring lined to an insertion-opening-end pipe core and steel fiber reinforced concrete adopted as the insertion-opening-end pipe core. The steel fiber reinforced concrete is used at the PCCP insertion opening end and the inner wall of the PCCP insertion opening end is lined with the thin steel ring, so as to improve bending resistance of the insertion opening end, resist to additional bending moment caused by the fact that pipelines wind prestressed wires and reduce large outward turning deformation of the insertion opening end pipe core; the deformation joint is reserved on the outer side of the insertion-opening-end special-shaped steel ring, so that pipeline deformation compatibility is met, additional bending moment is lowered, ring cracks are prevented from transferring to the concrete of the inner wall of the pipe core, and production quality and durability of the PCCPs can be improved significantly; the crack resisting structure can realize seamless joint with the existing PCCP production way, and has the advantages of simplicity in operation and low cost.

Description

technical field [0001] The invention relates to a spigot anti-crack structure of a prestressed steel cylinder concrete pipe and a manufacturing method thereof, belonging to the technical field of composite concrete pipes. Background technique [0002] Prestressed Concrete Cylinder Pipe (Press-stressed Concrete Cylinder Pipe, abbreviated as PCCP) is a composite pipe, which is composed of special-shaped steel ring, concrete, steel cylinder, high-strength steel wire and cement mortar. The characteristics of steel wire, tensile strength and steel cylinder impermeability are organically combined to make full use of the physical and mechanical properties of various materials, so that the pipe has the characteristics of "three highs" of high impermeability, high sealing and high strength at the same time. It has gradually become the preferred buried pipeline material for water transmission and diversion pipeline projects, especially for large-diameter, high-pressure, and deep-cover...

AI Technical Summary

Problems solved by technology

According to the existing code, although PCCP is allowed to have a certain degree of annular cracks when it leaves the factory, it may occur that the cracks cannot be completely closed during the subsequent service process, and the coordination of pipeline deformation cannot be satisfied. Under the action of internal and external pressure, by The liquid infiltrated from the ring crack of the inner wall of the spigot will corrode the steel cylinder and steel wire, reduce the structural bearing capacity of the pipeline, reduce the service life of the pipeline, and in severe cases cause the steel cylinder or steel wire to break, resulting in a pipe burst accident

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