The principle of the prestressed carbon fiber plate is to apply a certain prestress to the carbon fiber plate. The carbon fiber plate is already at a higher stress level before it bears the load stress transmitted by the structure, and has a certain strength in advance. As a result, its high-strength performance is fully utilized, which belongs to the active reinforcement method, and the reinforcement effect on the structure is very obvious. Prestressed carbon fiber plate has been used well in the reinforcement market in recent years with its unique reinforcement advantages.

The prestressed carbon fiber plate reinforcement system on the market generally consists of three parts: carbon fiber plate, anchors, and carbon fiber plate glue. To achieve a certain reinforcement effect, these three parts need to work together. However, as with any other reinforcement method, although the prestressed carbon fiber plate has obvious reinforcement effects, various problems will inevitably occur in construction operations:

1. Carbon fiber plate fractures horizontally or longitudinally

There are two reasons for the fracture of the carbon fiber plate: one is the unqualified quality of the carbon fiber plate material. The carbon fiber plate is formed by infiltrating and hardening carbon fibers arranged in the same direction with resin, and has ultra-high strength. Under a certain length, how much carbon fiber plate can bend without being damaged actually depends on the bonding material and the production process. There are different types of defects on the surface of carbon fiber plate, large deviation of straightness, etc., which will cause stress concentration, uneven force or damage to the anchored end of the carbon fiber plate in the process of high-stress tension. Under the stress state of more than ten tons, damage is extremely easy to occur, which brings no small hidden dangers to the safety of the operation site.

On the other hand, construction or mold installation causes excessive transverse shear resistance of the carbon fiber plate, or the longitudinal eccentric force of the carbon fiber plate. The strength of the carbon fiber plate is anisotropic, and it is easy to cause the carbon plate to break due to improper construction.

2 Slippage of carbon fiber plate

Because the gap between the clamp and the clamp is too large, the clamping force is insufficient, which causes the prestressed carbon fiber plate to slip off when the prestress is applied. The slip of the carbon fiber plate affects the application of prestress and is not conducive to the reinforcement of the structure.

3 Invalid limit frame

The limit frame plays a very important role in the effect of tension and anchoring. If the limit frame fails due to the insufficient strength of the screw used to cause the fracture or deformation of the limit frame, it will not be able to strengthen the structure.

4 Anchor block failure

In the installation process of the prestressed carbon fiber plate, the anchor block failed due to the installation error of the anchor block.

5 Jack problem

Jack is a special tool for tensioning prestressed carbon plates. Oil leakage or tonnage of the jack will affect the construction. Therefore, the parameters of the jack should be strictly checked before use and avoid overpressure and overload. Check the oil volume of the oil pump before tensioning, and run the jack empty stroke several times to empty the air in the jack and the oil pipe.

In summary, the problems in the construction of prestressed carbon plate are basically caused by the quality of the material itself or improper construction. Shanghai Horse has been engaged in the research and development, production and sales of reinforcement materials for more than ten years. It has developed and produced prestressed carbon plate reinforcement materials. The self-developed wedge anchors are mechanically anchored, which can achieve the ultimate failure of the carbon fiber plate without failure. And under the fatigue load test of 2 million times, the carbon fiber plate did not break, no fatigue damage, and there was no relative slip between the anchor and the carbon fiber plate.