Construction method for strengthening long-span concrete structures with prestressed carbon fiber sheets

Abstract

A construction method of reinforcing a large-span concrete structure with prestressed carbon fiber sheet comprises the following steps of forming bolt embedding holes on the side surface to be reinforced of the large-span concrete structure, and embedding high-strength bolts of different specifications into the bolt embedding holes through adhesive glue; fabricating stretch sheet fixing portions, stretch sheet moving portions and stretch power fixing portions; mounting the stretch sheet fixing portions, stretch sheet moving portions, stretch sheet assembling units, stretch power fixing portions and stretch power portions, wherein the stretch sheet assembling units, the stretch power fixing portions and the stretch power portions are made of carbon fiber materials; stretching stretch sheet; and removing stretching power and tightly pressing and adhering the stretch sheet onto the surface of the large-span concrete structure. The construction method of reinforcing the large-span concrete structure with the prestressed carbon fiber sheet can achieve the gapless adhesion between the prestressed stretch sheet and the concrete structure to be reinforced, facilitate the coordination of the uniform stress force of the same sections of the carbon fiber filaments of the stretch sheet, improve the integral stress performance of the prestressed carbon fiber sheet and the coordination deformation capability of the prestressed carbon fiber sheet and the concrete structure and give full play to the high-strength characters of the carbon fiber sheet.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, in particular to a construction method for reinforcing a large-span concrete structure with a prestressed carbon fiber sheet. Background technique [0002] Carbon fiber is a high-performance fiber-reinforced material with high strength, high modulus, high temperature resistance, wear resistance, corrosion resistance, etc., and has the softness and processability of ordinary fibers. In recent years, with the improvement of production technology and the expansion of production scale, carbon fiber has been widely used in the field of structural reinforcement in civil engineering. [0003] Since the construction of large-scale infrastructure in my country, the durability of structures has been a prominent issue that seriously restricts the sustainable development of civil engineering structures and the service life of structures. A large number of concrete structures are in urgent need of r...

AI Technical Summary

Problems solved by technology

[0005] However, the actual engineering application of prestressed carbon fiber sheet reinforcement technology is still relatively small. The main reasons are: the existing prestressed carbon fiber sheet tension anchor technology is not mature enough, lacks stereotyped and reliable tension equipment, and tension construction The process is complicated, and it is difficult for general reinforcement construction units to grasp the key points

At present, the relevant research on prestressed carbon fiber sheet reinforcement technology is still in the laboratory stage, and it is still difficult to reach the point of practical engineering application.

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