On July 4, 2022, the ballastless track construction of the newly built Fuzhou-Xiamen High-speed Railway Quanzhou Bay Sea-crossing Bridge, undertaken by the Second Aviation Administration of China Communications Construction Company, was completed.

The newly built Fuzhou-Xiamen high-speed railway is located in the coastal area of Fujian, starting from Fuzhou in the north and reaching Xiamen and Zhangzhou in the south. The main line is 277 kilometers long and has a design speed of 350 kilometers per hour. Among them, the Quanzhou Bay Sea-crossing Bridge is a key control project of the whole line. It is located in Quanzhou City, with a total length of 20 kilometers and a sea area construction length of 9 kilometers. The main bridge is 800 meters long and the main span is 400 meters. Beam semi-floating system cable-stayed bridge, which is also the first cross-sea high-speed railway bridge in China.

The project team of CCCC Second Navigation Bureau has developed and successfully applied the CPIII rapid networking method for cross-sea multi-connected large-span bridges, the wind-proof method for fine adjustment of ballastless tracks in strong wind areas, and the cable-stayed cross-sea high-speed rail for the complex marine environment. Construction method for linear control of double-block ballastless track of bridge. In order to adapt to the technical conditions of ballastless track laying and the seismic requirements of long-joint high-pier sea-crossing bridges in high-earthquake-intensity areas, the approach bridge in the deep-water area adopts a multi-joint 3×70-meter continuous rigid frame without supports, with a total of 21 joints. This form is widely used in China. This is the first time in railway construction.

After the Fuzhou-Xiamen high-speed railway is completed and opened to traffic, Fuzhou and Xiamen will realize a one-hour living circle, which will enable 6 cities in Fujian to realize the "high-speed railway to Beijing", which will promote the rapid integration of Fujian into the national high-speed railway network and play the role of the coastal high-speed passenger passage linking the previous and the next. significant.Editor/Ma Xue