Device and method for tensioning and reinforcing double layers of pre-stress carbon fiber sheet at same time

Abstract

The invention discloses a device and method for tensioning and reinforcing double layers of a pre-stress carbon fiber sheet at the same time. The device comprises a tensioning device, an anchoring steel plate and a rolling device. The tensioning device comprises a jack, a tension sensor, a rotating locking device and a pressing device in a sequential connection mode, the bottom of the jack and the bottom of the pressing device are fixedly connected with a tensioning fixing support, and the tensioning device is detachably fixed to the reinforced component through the tensioning fixing support. The rolling device comprises a pressing device, a rolling shaft and a far-end fixing support, wherein the pressing device and the rolling shaft are detachably fixed to corresponding positions of the reinforced component through the far-end fixing support; at the near end of the tensioning device, one end of the carbon fiber sheet is fixed to the reinforced component through the anchoring steel plate, the other end of the carbon fiber sheet is fixedly tensioned to the rotating locking device after being wound around the rolling shaft, and the double layers of the carbon fiber sheet are tensioned at the same time through retracting and pulling of the jack.

Description

technical field [0001] The invention belongs to the field of civil engineering bridge structures, and in particular relates to a double-layer simultaneous tensioning reinforcement device and method of prestressed carbon fiber cloth. Background technique [0002] The bridges built in the early stage at this stage are affected by the natural environment and loads for a long time, and various diseases and even deterioration will inevitably occur, thereby reducing the durability and bearing capacity of the bridge structure. Some of these bridges also have low design loads, insufficient bearing capacity, and lack of necessary maintenance measures. Under the above-mentioned environmental factors and loads, a considerable number of bridges have suffered serious diseases, and the safety and smoothness of road traffic have been seriously affected. [0003] Carbon fiber cloth has the characteristics of high strength, light weight, and corrosion resistance. It is an ideal material for ...

AI Technical Summary

Problems solved by technology

Because in the process of brushing the adhesive glue, it is inevitable that there will be too much glue in some parts, and during the loading process, as the loading force increases, the carbon fiber cloth will elongate, and the parts with uneven glue Slippage and premature peeling will occur, thereby reducing the utilization rate of carbon fiber cloth

[0006] 3. Due to the unique physical characteristics of carbon fiber cloth and the complex structure of the existing tensioning equipment, the operation is cumbersome, and the construction time is long, it is impossible to apply a certain prestress to the carbon fiber cloth well, and it cannot meet the requirements of on-site construction.

[0007] 4. For the general prestressed carbon fiber cloth reinforcement equipment, only a single layer of carbon fiber cloth can be stretched, and the test shows that only one layer of carbon fiber cloth can improve the performance of the reinforced member and cannot meet the reinforcement requirements.

[0008] 5. During the stretching process of prestressed carbon fiber cloth, prestress loss often occurs. Although the absolute value of prestress loss is small, the reinforcement performance of prestressed carbon fiber cloth is extremely sensitive to the value of prestress loss.

The traditional reinforcement equipment displays the stress through the oil pressure gauge on the jack. Due to the low accuracy of the oil pressure gauge, the prestress can only be roughly determined, but the loss of prestress cannot be measured, resulting in the failure of the prestressed carbon fiber cloth. Reinforcement quality cannot be guaranteed

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