T.Y. Lin International (TYLI) served as Bridge Designer for the Caijia Rail Transit Bridge (Caijia Bridge) spanning the Jialing River in Chongqing, China. Considered the highest metro line crossing in the world at approximately 100 meters above water level, the Caijia Bridge is one of Chongqing’s most recent rail-only bridges.
The 1,230-meter-long, cable-stayed Caijia Bridge carries two mass transit rail tracks and has a 640-meter-long main section that consists of five spans (length in order: 60 meters, 135 meters, 250 meters, 135 meters, and 60 meters). The southern end section comprises two 45-meter-long spans, while the northern end section has six spans of 60 meters and three spans of 50 meters.
Along with meeting stringent functionality requirements, TYLI’s design for the signature structure also satisfied crucial aesthetic demands made by the project owners and the city of Chongqing.
- TYLI’s cable-stayed design offers the advantages of both a visually-appealing profile and the appropriate deflection control.
- The bridge design had to accommodate substantial seasonal variances in river height and width, while matching the 250-meter main span length of two nearby bridges.
- To give a more robust appearance to the narrow profile of the two-track bridge girder, a diamond shape was selected for the 186-meters-tall towers and a double-plane arrangement was chosen for the cables.
- The two legs of the lower portion of the towers were connected to form a box cross section, enabling the towers to better resist vessel impacts at a variety of water levels.
- A detailed analysis of rolling stock to ascertain the dynamic behavior of the bridge, taking into account the interaction of wind with the trains and the structure, showed that TYLI’s design for the Caijia Bridge is stable for its design loads.
- To enable future adjustments to the cable forces and the elevation of the girder, if required, TYLI’s design enables the upper and lower ends of the cables to be stressed at any time from inside the tower legs or from beneath the girder wing slab. Any future adjustments can be completed by a single, large hydraulic jack.
- Bridge Award of Excellence, 2015
American Segmental Bridge Institute (ASBI)