en.Wedoany.com Reported - The new Jinma Bridge, part of the Guangzhao Expressway expansion project undertaken by China Railway Group Limited's subsidiary China Railway Major Bridge Engineering Group, has recently been successfully completed. Spanning the Xijiang River, the new Jinma Bridge connects Sanshui District of Foshan City with Gaoyao District of Zhaoqing City. Located approximately 17.25 meters downstream of the old Jinma Bridge, it has a total length of 1,936.6 meters, a deck width of 23.75 meters, and a main tower height of about 132 meters.

The new Jinma Bridge adopts an H-shaped cable tower, with its external appearance essentially replicating the old Jinma Bridge currently in service, both being single-tower cable-stayed bridges. However, the main span of the new bridge totals 736 meters, 50 meters longer than the old bridge; the side span is 85 meters, 25 meters longer than the old bridge. These adjustments align the main tower positions of the two bridges, ensuring visual harmony and a smoother overall alignment.

Unlike the old bridge's predominantly concrete design, the new bridge employs a "continuous-cable-stayed steel-concrete composite girder collaboration" structure to adapt to the site conditions and optimize structural stress, achieving an optimal balance of internal forces and stiffness. The application of new materials reduces the weight of the cable-stayed section's girder by over 9,000 tons compared to the old bridge, decreasing concrete usage while also alleviating the load on the tower and cables.

For the two closure gaps of the bridge—the cable-stayed girder section and the continuous girder section—the project team employed different techniques for precise control. The cable-stayed girder section was adjusted by regulating cable tension and applying counterweights, while the continuous girder section utilized processes such as rigid rotation of support lifting and lowering beams, and temporary support elevation adjustments, enabling precise alignment of steel girder elevation and rotation angles, ultimately achieving millimeter-level closure.

The new Jinma Bridge is a critical control project of the Guangzhao Expressway expansion and is scheduled to open to traffic in 2027. By then, the two Jinma Bridges will each operate as one-way four-lane thoroughfares, serving as a "golden corridor" supporting the integration of Guangzhou, Foshan, and Zhaoqing.

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