China News Service, Guangzhou, July 25 (Cai Minjie and Lei Jian) ​​Guangdong Provincial Communications Group announced on the 25th that the construction of the main cable strands on the left side of the Lingdingyang Bridge in the Shenzhen-Central Corridor of the Guangdong-Hong Kong-Macao Greater Bay Area Super Project has exceeded 100, and the whole has been completed. half of the total installed.

　　The main cable is the main force-bearing member of the suspension bridge, and is called the "spine" of the suspension bridge.

The single main cable of Lingdingyang Bridge is composed of 199 full-length cable strands, and each strand is composed of 127-wire, 6 mm diameter domestically developed 2060 MPa high-strength steel wire. cable wire.

Each cable strand is about 3,000 meters long and weighs about 85 tons. A single main cable weighs 16,915 tons. The total weight of the bridge's main cables is 33,830 tons.

The builder is tightening the cable grip bolt with an electric wrench Photo by Chen Xubin

　　Wang Xiaojia, chief engineer of the S05 project of Poly Changshen, Shenzhen and Middle Passage, said that the use of 2060 MPa high-strength cable wire will not only help reduce the amount of steel used for the main cable, reduce wind resistance, and achieve energy saving and emission reduction, but also help improve the bridge. reliability.

The main cable of Lingdingyang Bridge in Shenzhong Channel adopts 2060 MPa grade cable wire, which is another upgrade breakthrough after Nansha Bridge uses 1960 MPa main cable wire.

　　In order to better build the "backbone" of the "super project" in the Bay Area, the technical team of the S05 bid project of Poly Changshen and Middle Passage has rationally formulated a management system for the erection of cables and strands. Speed ​​up the process. It takes about 2 hours and 30 minutes for a single traction to speed up the process of cable strand erection.

　　"When pulling cables during the day, from cable strand pulling to lifting and traversing, and finally shaping into the saddle, as large as checking the status of the cable strands during the cable strand pulling process, and as small as cleaning the saddle trough sawdust when entering the saddle, every key point has Managers check." Zhang Kai, deputy manager of the S05 standard project of Poly Changshen-Zhongshan Channel, introduced.

　　Due to the strong wind at sea, it will affect the night-time ropes.

In order to solve the influence of the wind vibration of the cable strands on the adjustment cable, the project department innovatively proposed "high-precision cable strands + restraint frame + information measurement system + traditional method assistance" to adjust the sag of the cable strands to alleviate the impact of wind vibration and greatly improve the Cable strand erection accuracy.

The builder is controlling the speed of the cable release by the remote control cable frame. Photo by Chen Xubin

　　Now is the high temperature period in summer, the project department has adjusted the operation time reasonably to avoid high temperature construction, and distributed heatstroke prevention medicines such as Huoxiangzhengqi water to the operators.

　　Shen Weidong, secretary of the S05 project of the Shenzhen-Zhongshan Channel of Poly Changchun, introduced that in order to ensure the safe production and construction of the Lingdingyang Bridge, the team leaders of each construction area will report the physical status of the operators every half an hour.

In addition, doctors from cooperative hospitals are on duty at the front line of offshore construction, which can provide timely medical services to field operators.

　　At present, the island-tunnel project and bridge project of the Shenzhen-Zhongshan Channel are progressing in parallel.

In terms of artificial islands, the east artificial island has been fully transferred to the island's tunnel structure construction, and the west artificial island is undergoing construction of the main structure of the ramp tunnel on the island.

A total of 28 pipe sections have been deposited in the immersed tunnel.

In terms of bridge engineering, the Zhongshan Bridge has been closed, and the construction of the road surface and ancillary facilities is underway.

The towing of the cable strands of the Lingdingyang Bridge is still in progress, and the erection of all the main cable strands is expected to be completed in September this year.

The project is scheduled to be completed and opened to traffic in 2024.

(Finish)