A CFRP sheet combined string beam reinforcement installation system

Abstract

The invention discloses a CFRP sheet combined string beam reinforcement installation system, which includes a beam body, n+1 CFRP sheets, n fixing brackets and 2n+2 anchors, n is a positive integer greater than or equal to 1, and the beam body is horizontal Setting, the fixed bracket is vertically arranged on the lower surface of the beam body, the lower end of the fixed bracket is hinged with two anchors, the two ends of the lower surface of the beam body are also provided with two hinged seats, and the fixed bracket is located between the two hinged seats, The two hinged seats are respectively hinged with an anchor, and a CFRP sheet is provided between the hinged seat and its adjacent fixed bracket, and a CFRP sheet is also provided between the two adjacent fixed brackets, and the two ends of the CFRP sheet are clamped on the on the corresponding anchorage. With the remarkable effect of the present invention, in the process of clamping and stretching the CFRP sheet, the stress on the CFRP sheet is dispersed to ensure that the CFRP sheet is evenly stressed, because the CFRP sheet can form any angle through the hinge, ensuring The CFRP sheet is stretched along a straight line, which avoids the shear failure of the CFRP sheet, thereby improving the bearing capacity of the reinforced member.

Description

technical field [0001] The invention relates to a reinforcement and installation system of a CFRP sheet combined string beam, in particular to a CFRP sheet composite string beam reinforcement installation system. Background technique [0002] Concrete beams in modern buildings, traffic, bridges and other engineering structures are subject to load changes due to environmental erosion, material aging, structural function changes, or insufficient bearing capacity or cracks due to natural and human disasters, etc. Huge security risk. [0003] Reinforcement and repair of engineering structures is the most important solution at present. Carbon fiber reinforced composite materials (referred to as CFRP) have the characteristics of light weight, high strength, corrosion resistance, fatigue fracture resistance, not easy to creep, low linear expansion coefficient and relaxation rate, etc. , widely used in the reinforcement and repair of engineering structures. According to the shape ...

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Problems solved by technology

[0004] The existing corrugated tooth anchors use two independent anchors to clamp the CFRP sheet, and then tighten the two anchors by threading tensioning screws, and the tensioning screws are distributed outside the edge of the CFRP sheet , because the stress at the tightening screw is relatively concentrated during clamping, the part of the CFRP sheet close to the tightening screw may be broken or damaged due to excessive force; moreover, the shear resistance of the CFRP sheet is poor, when When the CFRP sheet is tensioned and attached to the bottom of the bridge, the carbon fiber reinforced composite is prone to brittle fracture when subjected to an external force perpendicular to the plane of the CFRP sheet

[0005] In addition, when the CFRP sheet is directly stretched on the lower part of the reinforced member (such as the bridge deck), even if there is no unfavorable situation such as prestress loss or anchorage node damage, because it does not completely improve the stress of the reinforced member, it will have a negative impact on the reinforced member. The reinforcement effect is very limited

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