Early bridges began to have different degrees of problems. Some bridges had more diseases due to weathering or water impact, and some bridges even had local collapse problems. These are urgent problems to be solved in bridge construction.

Prestressed carbon fiber plate reinforcement technology can effectively avoid the above problems, and has a positive significance for the maintenance of early bridges and the quality control of new bridges.

Reinforcement Technology of Prestressed Carbon Fiber Plate

The research on the reinforcement technology of prestressing carbon fiber sheet in our country began at the end of the 20th century. The reinforcement technology of prestressing carbon fiber sheet is a new reinforcement technology, which is reformed from the processing technology of external bonded carbon fiber sheet.

The external bonded CFRP board reinforcement technology used in our country in the early stage only sticks CFRP on the surface of the tension area of the structure, which makes CFRP bear the tension with the original structure, so as to reduce the load of the original structure and achieve the reinforcement effect. The traditional reinforcement mode T is simple and convenient for construction, so it has been used by most construction enterprises for a period of time.

However, with the increasing use of time and in-depth study of traditional reinforcement technology, this reinforcement technology gradually exposes its drawbacks. The construction personnel will waste a lot of materials when using this reinforcement mode. Usually, the elastic modulus of CFRP is low, but the tensile strength is high. If constructors want to play the role of CFRP, they should at least carry out more than 1.5% of the tensile deformation. However, in the actual operation process, the construction enterprises have certain restrictions on the deformation of the bridge, and the surface strain of the bridge can not reach 1.5% of the deformation. The defect of reinforced concrete reinforcement by traditional reinforcement technology is more obvious: if the steel bar is deformed, it will only produce 0.18% yield deformation. Even under ideal condition, the steel bar will yield deformation, and the strength of carbon fiber can only play less than 12%.

It can be seen that the traditional reinforcement technology can not fully utilize the high strength of CFRP, so improving the traditional reinforcement technology is an inevitable trend. Prestressed carbon fiber sheet reinforcement technology can reach a higher stress level before the carbon fiber sheet bears the load stress transmitted by the structure, and give full play to the partial strength of carbon fiber sheet in order to make full use of the high strength performance of carbon fiber sheet. Therefore, the pre-stressed carbon fiber sheet reinforcement technology will inevitably replace the original carbon fiber reinforcement technology, and become the reinforcement technology used by most enterprises.

Epilogue

Prestressed carbon fiber plate reinforcement technology plays a vital role in bridge reinforcement engineering, but also has the incomparable advantages of other technologies, can greatly extend the service life of the bridge, but also ensure the safety of the bridge. Therefore, we should actively develop the application of pre-stressed carbon fiber sheet reinforcement technology in construction, in order to promote the development of transportation.