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The Shenzhen-Zhongshan Corridor is currently the world's most difficult cross-sea cluster project for comprehensive construction, and there are a variety of scientific and technological highlights hidden along the route.
As a key control project of the Shenzhong Channel, the main span of the Shenzhong Bridge is 1,666 meters, which is the world's largest span of all-offshore steel box girder suspension bridge.
In the center of the deck of the Shenzhong Bridge, a glass wall is hidden. It looks like ordinary tempered glass, but they are the "secret weapon" of the Shenzhong Bridge to resist the wind.
Chen Huanyong, Deputy Director of the Chief Engineer's Office of the Guangdong Shenzhong Channel Management Center: This is the central stabilizer plate, the main purpose of which is to improve the wind stability of the Shenzhong Bridge and hinder the development of vortices under the action of strong winds, so as to improve the stability of flutter.
Shenzhong Bridge is located in the Lingdingyang Sea area, which has particularly high requirements for wind stability. The main girder of the bridge is optimized by adopting the comprehensive pneumatic measures of "horizontal deflector + upper central stabilizer plate + high air permeability railing" to minimize the risk of flutter and vortex vibration of the bridge.
The super-large span, ultra-high bridge deck, and frequent typhoons at the Pearl River Estuary require the Shenzhong Bridge not only to have a more stable structure, stronger wind resistance, but also higher corrosion resistance of the cable.
Wang Heng, Executive Deputy Chief Engineer of the G05 Standard Project of China Railway Mountain Bridge Shenzhong Channel: The thermal spray zinc aluminum coating is used, and the corrosion resistance period is at least 5 years higher than that of all previous paint layers. If there is damage in the future, the paint layer can be repaired, and the bottom layer will not be damaged, so it is better to ensure that the steel beam has good corrosion resistance within 100 years of life.
The Shenzhong Corridor has the world's longest and widest submarine steel-shell concrete tunnel, with a total length of 6.8 kilometers. The lighting intelligent controller in the tunnel can automatically control and adjust the brightness of the light according to the detected light inside and outside the tunnel, color temperature data, traffic volume changes, day and night, etc. At the same time, on both sides of the tunnel driving tunnel, the intelligently adjustable full-color landscape light strip is also constantly changing color to reduce the monotony during driving.
Zhang Yongzhong, Project Manager of the JD2 Contract Section of the Shenzhong Corridor in Guangdong: The immersed tunnel should be the first time to use landscape light strips in China, and there are 7 colors that can be changed. Under normal circumstances, it may run like flowing water, and when a vehicle is rear-ended or breaks down, one of the sections will display a red alarm.
The 6.8-kilometer-long undersea tunnel of the Shenzhong Passage is considered to affect the stability of the signal in consideration of the factors affecting the signal stability such as the depth of the tunnel and the thickness of the steel wall of the pipe gallery, the staff reserved communication equipment connectors and trunkings in advance in the tunnel corridor, and deployed about 60,000 meters of leakage cables and other equipment supporting the 5G frequency band in the tunnel to achieve seamless signal coverage.
Li Weicong, Minister of the Traffic Engineering Department of the Shenzhen-Zhongshan Corridor in Guangdong: The main thing is to add 365 sets of satellite navigation simulation release equipment in the tunnel, which transmit the same standard of Beidou satellite navigation system in the entire tunnel without dead angles by receiving signals from satellites in orbit.
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Editor: Wang Yifan