China News Service, Guangzhou, September 26 (Reporter Cai Minjie) The Guangdong Transportation Group announced on the 26th that the Hui (Cheng) Xia (Yong) Expressway Dongjiang Super Bridge has completed the closure of the entire bridge. The east and west sides of the bridge "reunion" on the 25th during the Mid-Autumn Festival, marking key progress in the construction of the north-south transportation axis of Huizhou's "Feng" traffic main framework.
The Huixia Expressway has a total length of approximately 69.9 kilometers and is a key project on the main north-south traffic axis of Huizhou City. After the project is completed, it will connect Shenhai Expressway and Huida Expressway to form a transportation artery from Huicheng District to Daya Bay Economic and Technological Development Zone, further improve the expressway network in the Guangdong-Hong Kong-Macao Greater Bay Area, and inject strong momentum into the high-quality development of the region.
The Dongjiang Super Bridge is the most difficult control project to be constructed along the Huixia Expressway. It adopts a single-tower steel box girder cable-stayed bridge design. The total height of the bridge tower is 172 meters, which is currently the highest bridge tower in Huizhou. The bridge is 57.5 meters wide, built to a two-way eight-lane standard, with sidewalks and non-motorized lanes set up simultaneously, and spans the Dongjiang Channel.
The main tower of the bridge adopts the shape of the ancient Chinese character "Feng". The 102-meter range of the upper tower column is a steel shell-concrete composite cable tower, and the 70-meter range of the middle and lower tower columns is a concrete tower. There are 21 pairs of stay cables on one side. The structure is novel and the construction is difficult.
The steel box girder of the Dongjiang Super Large Bridge has a total of 49 segments, with a total length of 566 meters. The girder segments are wide and heavy, making it difficult to hoist and match. It puts forward high requirements for single segment line matching and full bridge line control.
Steel box girders are processed at the Zhongshan and Shanwei bases, and ships enter the Dongjiang River through the Pearl River Estuary, passing through many maritime jurisdiction waters such as Zhongshan, Dongguan and Huizhou. They are restricted by the "daytime upward and nighttime downward" traffic control of the Dongzhou River Bridge in the Guangzhou-Shenzhen Expressway Expansion (Dongguan Section), the complex navigation conditions of tugboat escort in the Shilong Section of Dongguan, the width and height restrictions of the Huizhou Jiantan Ship Lock, and the tidal passage of the downstream shoals. The project team communicated and coordinated with various maritime, waterway, ship lock and other units in advance to increase transport ships and plan transportation time to meet on-site lifting requirements.
Then there are the problems of positioning, assembly, and welding. The width of the steel box girder of the Dongjiang Extra Large Bridge is 57.5 meters. To this end, the project processing base uses long-line method matching, combines three-dimensional laser scanning technology to generate real models of components, and pre-assembles to ensure the splicing effect of the beam surface; at the same time, Beidou + GNSS real-time dynamic monitoring is used on site to achieve millimeter-level accuracy in splicing each segment.
After the Dongjiang Super Large Bridge is closed, the project department will promote the bridge deck paving and installation of bridge ancillary facilities. Once completed, the project will be of great significance in serving Huizhou’s urban area and promoting economic development along the route.
