On May 15, the first main cable strand of the Lingdingyang Bridge of the Shenzhen-Zhongshan Channel, which was constructed by the Second Navigation Bureau of CCCC, was successfully erected, and the bridge officially entered the stage of main cable erection.
The Lingdingyang Bridge of the Shenzhong Channel has a main span of 1666 meters and a main tower height of 270 meters. It is currently the world's largest span mid-sea steel box girder suspension bridge. This time, the first strand of the main cable is erected, that is, the reference cable, which is an important reference standard for subsequent cable strand erection, and its installation accuracy will directly affect the accuracy of the main cable shape.
There are two main cables in Lingdingyang Bridge. A single main cable consists of 199 cable strands. About 3000 meters and weighs about 85 tons. A single main cable of the bridge is about 1.06 meters in diameter and weighs 17,000 tons. The main cable is the key force-bearing component of the Lingdingyang Bridge. The maximum cable force of the two main cables will reach more than 100,000 tons during the bridge completion stage, which is equivalent to bearing the weight of three medium-sized aircraft carriers at the same time.
The main cable of Lingdingyang Bridge adopts domestic self-developed 2060 MPa galvanized aluminum steel wire, which is the main cable steel wire of suspension bridge with the highest strength in China. The use of 2060 MPa high-strength steel wire can reduce the self-weight of the main cable and reduce the amount of erection engineering. However, the wind and waves at the bridge site are large and the sea conditions are complex. The conventional caliper adjustment method is extremely difficult to operate. The difficulty of controlling the wear of the galvanized layer is even more rare in the industry.
Combining more than 25,000 steel wires into a neat and parallel circular main cable is a huge challenge. The CCCC Second Aviation Bureau project team has developed an unattended erection technology for ultra-long cable strands. By installing a high-definition camera on the puller It uses the image remote transmission function for remote monitoring, and at the same time, it performs image annotation and training learning on the target to realize the intelligent recognition of cable and strand posture, which provides a basis for the automatic start and stop of the traction system, which can reduce the operation intensity and reduce the traction risk.
After the Hong Kong-Zhuhai-Macao Bridge and the Nansha Bridge, the Shenzhen-Zhuhai Corridor is another important transportation artery for the construction of the Guangdong-Hong Kong-Macao Greater Bay Area. After completion, it will vigorously promote the economic and transportation integration and transformation and upgrading of the Pearl River Delta, and become a link between the east and west of the Pearl River Estuary. The direct link between the two sides of the strait will reduce the drive from Shenzhen to Zhongshan from 2 hours to 20 minutes.
