How to construct a bridge reinforced by prestressed carbon fiber plate anchor tension system? What a

1.The prestressed carbon fiber plate anchor for the original bridge is selected and installed without slotting, which protects the structure and is convenient for construction, saving the cost of labor and slotting materials.

2.The gap between the carbon plate and the bridge should be small, which can significantly reduce the amount of carbon glue and help to maximize the stress generated by the whole system.

3.The distance between the tension end anchor and the pier is reduced by anti-tensioning technology.

1. Requirements for coating structural adhesives.

When the reinforced concrete structure is reinforced with NJMKT prestressed carbon fiber plate, the structural adhesive should also be applied between the board surface and the concrete other than the tensile anchor part of the NJMKT carbon fiber plate (it is recommended to use NJMKT matching carbon fiber board adhesive).

NJMKT carbon fiber board special glue.

2. Fire protection requirements.

When the surface of the reinforced component has fire protection requirements, the adhesive and carbon fiber composite board should be protected according to the fire resistance level and fire resistance limit requirements specified in the current national standard "Code for Fire Protection Design of Buildings" GB-50016.

3. Requirements for pasting prestressed carbon plates.

When the NJMKT prestressed carbon fiber plate is used to strengthen the concrete structural components, the carbon fiber plate should be directly pasted on the concrete surface. Flush pasting is not recommended.

4. Apply prestress requirements.

Adopt this method to reinforce, before applying prestress, the measure of removing the live load acting on the reinforced structure can not be taken.

5. Anchor protection requirements.

Exposed NJMKT anchors should be protected by anti-corrosion measures.

NJMKT Prestressed Carbon Plate Tensioning System Anchor Protective Cover.

6. Tension control stress requirements.

The tensile control stress value of NJMKT prestressed carbon fiber plate should be multiple times of the design value of tensile strength of fiber composite material.

7. Precautions in the process of tensioning.

When it is found that there is an obvious slip phenomenon or the design tensile stress cannot be reached during the tensioning process, the bolt tightening force should be adjusted and then re-tensioned. When the tensioning process is smooth and the design stress is reached, the tensioning device is loosened, the adhesive is applied, and the secondary tension is reached to the design stress value.

The prestressed carbon fiber plate reinforcement method is indeed widely used in bridge repair in recent years, and the biggest advantage of choosing prestressed carbon fiber plate to reinforce the bridge is active reinforcement, which can give full play to the tensile strength of the carbon fiber plate, well limit the crack development and disturbance deformation, improve the bearing capacity of the bridge, and prolong the service life.

The ordinary carbon fiber plate reinforced bridge is passive reinforcement, and the carbon fiber plate can not give full play to the tensile strength, and the reinforcement effect will not be ideal.

Although the effect of selecting prestressed carbon fiber plate to strengthen the bridge is ideal, the premise is to choose a carbon plate with high performance, such as the tensile strength of the carbon plate reaches 3000MPa, the anchor head anchoring efficiency coefficient reaches 1, and the fatigue load test of 2 million times is passed.

The types of bridges include plate girders, box girders, and T-beams, and the diseases are not the same, so they need to be professionally tested and then reinforced, so as to achieve better reinforcement effects.

The reinforcement method of prestressed carbon fiber plate is suitable for the reinforcement of reinforced concrete bending, tensile and large eccentric compression members with small cross-section or insufficient reinforcement. This method is not applicable to plain concrete components, including the reinforcement of components with a reinforcement ratio lower than that on one side of the longitudinally stressed reinforcement.

The prestressed carbon fiber plate reinforcement method has the absolute advantages of active reinforcement, almost no increase in self-weight and no unloading for reinforcement, and shines in bridge reinforcement, and many domestic bridges are also reinforced by this method.

In addition, the degree of damage and disease of each bridge is different, so it should be tested and evaluated first, know its problems, and then choose a suitable prestressed carbon fiber plate reinforcement method.