On April 14, the main cable replacement work of the Wuhu Yangtze River Bridge, organized by CREC, was completed, which became the first cable replacement operation of highway and railway cable-stayed bridges in China.
The main bridge Wuhu Changjiang River Bridge, is a low-pylon cable-stayed bridge with double pylons and double cable planes with a main span of 312 meters. It is the first highway and railway cable-stayed bridge in China. There are 128 stay cables in total. It was officially started in March 1997 and opened to traffic in September 2000. With its large-scale, new technology and first-class quality, the Wuhu Yangtze River Bridge has become the fourth milestone in the history of Chinese bridges after the Wuhan, Nanjing, and Jiujiang Yangtze River Bridges.
The stay cables of the Wuhu Yangtze River Bridge have been in service for 23 years, exceeding the minimum design service life of stay cables. In order to comprehensively evaluate the health status of the existing stay cables and summarize the experience for the later replacement of stay cables, CREC Shanghai Bureau decided to select the long, medium, and short stay cables with relatively concentrated diseases to carry out experimental replacement and to carry out indoor dissection and mechanical property tests on the replaced old stay cables.
Train traffic requires track smoothness, and the track deformation caused by cable replacement must be controlled within the millimeter level. The new long-distance non-contact displacement measurement integrated system developed by China Railway Major Bridge Reconnaissance & Design Institute realizes multi-point real-time collection and analysis of track deformation information. It adopts the self-developed regression algorithm based on noise reduction theory to reduce the impact of highway bridge deck traffic load on alignment data. An integrated cloud platform for cable replacement construction monitoring of Wuhu Yangtze River Bridge was built to observe and monitor the cable force, main girder alignment (highway and railway pavement), component stress of key parts, track geometric parameters, and other data in real-time, and to intuitively display the changes of bridge structure data in the process of cable replacement, thus realizing "accurate, dynamic and intelligent" monitoring.
