Chishi Bridge Strengthening and Retrofitting

Located on Provincial Highway S387, Chishi Bridge crosses the Chishi River, with a total length of 127 meters and a total width of 9 meters. It is an important channel for people in Chishi Town to travel daily. It also undertakes the heavy traffic task of large construction vehicles for major projects such as Shenzhen Middle School High School Park, Guangzhou Shantou High speed Railway, Shenzhen Shantou High speed Railway, etc.

The continuous increase in traffic volume tests the bearing capacity and durability of the bridge. According to the "medical examination report" of the bridge, there is slight development of cracks in the existing Chishi Bridge, and the main beam is clearly in a cracked state, affecting travel safety.

A systematic analysis was conducted on the structural diseases and adaptability issues of bridges, and a bridge maintenance plan was selected according to local conditions. Cracks that appeared on the bridge were repaired in a timely manner, debris on the surface of the main beam was removed, and the appearance was painted. T-beam carbon fiber plate was used for reinforcement and disposal. At the same time, the cement concrete pavement on the bridge deck was "upgraded" with ultra-thin asphalt overlay and redrawn markings. After some renovation and reinforcement, the Chishi Bridge has been upgraded from a Class III bridge to a Class II bridge (i.e. the bridge is in good or good technical condition).

Surrounding residents stated that after the renovation of the Chishi Bridge, the old faces have taken on a new look. The newly paved asphalt pavement is very flat, and the markings and signs are clear. Walking on the bridge feels very reassuring and comfortable.

In this maintenance and reinforcement project, the prestressed carbon fiber plate reinforcement process was used for the first time. The carbon fiber plate material used in this process has the characteristics of high strength and high elasticity. Compared to traditional bridge reinforcement technology, the prestressed carbon fiber plate reinforcement technology has obvious advantages such as less rusting, low maintenance costs in the later stage, fast construction, and no impact on traffic.

Strengthening technology of prestressed carbon fiber plate

Utilizing the high strength and high elasticity material properties of carbon fiber plate, based on the pre tension of carbon fiber plate, initial pre tension is generated, causing the beam to reverse arch, cracks to narrow or even close, effectively improving the yield load of steel bars and the ultimate bearing capacity of the structure