Method and structure for reinforcing prefabricated prestressed beam-column joint through mixed fiber concrete

Abstract

The invention relates to a method and structure for reinforcing a prefabricated prestressed beam-column joint through mixed fiber concrete. The method comprises the following steps that undamaged beambottoms on the two sides of a cast-in-place column of the prefabricated prestressed beam-column joint are supported through steel pipe supports; a concrete diagonal area of a damaged area of a beam end plastic hinge is polished by using a drilling machine; anti-shearing keys are arranged at an intact beam end section area and a core area section, and chiseling treatment is carried out on two endsof the anti-shearing keys; steel-polypropylene fiber concrete is poured into the polished area, regional diagonal replacement is carried out on the damaged area of the beam end plastic hinge, and vibrating while pouring is conducted; the poured area is covered, moisturized and maintained; after the poured area reaches 80% of the design strength, the remaining area is polished, and the steel-polypropylene fiber concrete is used to pour the polished area, and vibrating while pouring is conducted, so as to complete replacement; and reinforcement is finished when the remaining area reaches the reinforcement design strength. The damaged concrete is directly replaced by a steel-polypropylene fiber concrete replacement method.

Description

technical field [0001] The invention relates to a method and structure for reinforcing prefabricated prestressed beam-column joints with mixed fiber concrete. Background technique [0002] The existing reinforcement methods are generally to strengthen the damaged position after grinding or directly externally, without considering the connection between old and new concrete, on-site construction and durability. On November 24, 2017, the State Intellectual Property Bureau published a patent application for a "concrete column reinforcement method based on green high-performance fiber-reinforced cement-based composite materials" (notification number: CN 107382187 A). The steps of the technical plan are: use a drilling rig to chisel off the loose concrete on the surface of the damaged column to expose a solid structural layer, remove impurities on the surface of the column, clean up floating dust and loose stones; support the formwork in the plastic hinge area; rinse with water b...

AI Technical Summary

Problems solved by technology

Its advantage is that the sprayed chopped fibers are randomly distributed and can withstand stress in any direction, but it requires large-scale shotcrete machinery.

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