The application of carbon fiber reinforcement technology in the treatment of bridge structure cracks can not only effectively improve the bearing capacity of the bridge structure, but also greatly reduce the cost of the bridge structure crack reinforcement treatment.

Case analysis

The starting point of the section of Fojiang Expressway and Shun to Chencun is located in Lishui Town, Nanhai District, Foshan City, on the administrative boundary of Nanhai District and Huadu District at the intersection of Zhuhai Second Ring Road and the planned Hongmian Avenue. The end point is located in Chencun Town, Shunde District, which is interconnected with Chencun of Guangming Expressway. The design speed is 100km/h and the two-way eight-lane highway standard.

The starting point of the route in this bidding section is K22+100, the ending point is K31+300, and the total length of the route is 9.2km. This tender section includes the Guangzhou-Foshan Shinkansen Interchange, Haiba Road Interchange, Haiwu Road Interchange, etc. In June 2016, a large number of transverse cracks were found between the two plates on the Haiba Road Interchange, with a crack width of 1.2-3.5mm. In order to control the continuous development of cracks, carbon fiber sheets are pasted along the longitudinal direction of the plate to achieve the purpose of weakening the tensile zone of the bending member.

By referring to the design load of the bridge, according to the actual conditions of the crack and the comprehensive factors of the carbon fiber sheet tensile test results, it is determined that the carbon fiber sheet is pasted in three layers, and epoxy resin is used for grouting to control the cracks from continuing to develop. By June 2017, the cracks were clearly under control and no new cracks occurred.

Bridge structure crack analysis

(1) The actual load exceeds the design load

(2) Cracks caused by temperature changes

(3) Cracks caused by concrete shrinkage

(4) Cracks caused by foundation deformation

(5) Cracks caused by corrosion of steel bars

(6) Cracks caused by expansion under freezing conditions

Carbon fiber reinforced bridge cracks

There are many ways to deal with cracks in bridge structures. Carbon fiber reinforcement technology is a new type of reinforcement method. Its main feature is that the carbon fiber is glued to the crack surface of the bridge structure with glue, which can greatly improve the stability of the original bridge structure and enhance the bearing capacity of the bridge.

In specific applications, in order to ensure the stability of the bridge structure, carbon fiber with high strength and high elasticity should be used as much as possible in the crack reinforcement treatment. At the same time, the arrangement of carbon fibers should be as sheet-shaped as possible. After being immersed in high-viscosity materials such as resin, they are firmly pasted on the surface of the bridge structure, which can promote the bridge's original structure and the carbon fiber to be closely combined together.

Summary

In summary, this article combined with engineering examples, in-depth study of bridge structure crack analysis and carbon fiber reinforcement technology. The research results show that the bridge structure crack is the most common disease in bridge engineering. If scientific and reasonable reinforcement treatment is not carried out, it will have a serious impact on the stability and quality of the overall structure of the bridge. Through the application of carbon fiber reinforcement technology, it can effectively suppress the continued development of cracks, and can greatly improve the stability of the overall structure of the bridge. At the same time, it also has the advantages of convenient construction, fast construction speed, and good construction effect. It is worthy of widespread application.