Cracked Bridge Strengthened

Due to its long age and high traffic flow, the bridge has a large number of transverse cracks in the bottom plate and a large number of vertical cracks in the web; individual supports are aging and cracking; the pier body is damaged and the expansion joints are longitudinally cracked.

The bridge maintenance and reinforcement design is carried out. A reinforcement company undertakes the reinforcement of this project. Horse is responsible for the supply and technical support of prestressed carbon fiber plates and prestressed carbon fiber plate anchor materials for this project.

1. The bridge face is treated with glue injection for the reserved groove concrete;

2. After the cracks of the hollow bridge are treated with glue injection and surface sealing according to the width, the 1-4# bottom grids are treated with pasted steel plates. The 5-9# bottom plate is treated with pasted prestressed carbon fiber cloth. The 15-18# bottom plate is treated with pasted prestressed carbon fiber board;

3. Replace the full bridge bearing.

In December 2016, maintenance and reinforcement began, and the cracks at the bottom of the beam were first treated with grouting. Then use the prestressed carbon fiber board with a thickness of 3.0MM, a width of 5CM, a tensile strength of not less than 2400MPA, and an elastic modulus of not less than 160GPA for reinforcement. The length of each prestressed carbon fiber board is 15.4 meters, and the tensile tonnage of each strip reaches 17 tons, and a total of 52 strips are stretched. The main construction process is: scribing and grooving the bottom plate, drilling and planting reinforcement, installing the support base → grinding and cleaning the concrete surface → assembling the carbon fiber anchorage → adjusting and applying the carbon fiber plate glue → graded tensioning of the carbon fiber plate → surface protection.