en.Wedoany.com Reported - Recently, the first steel box girder roof panel unit prototype and the first round of segment pre-assembly for the south main bridge of the south waterway bridge of the Zhangjinggao Yangtze River Bridge, constructed with the participation of China Railway Shanhaiguan Bridge Group, successfully passed acceptance inspection. This marks the official commencement of the mass production phase for the steel box girders of this world's largest suspension bridge, which boasts a main span of 2,300 meters.
Located approximately 28 kilometers downstream of the Jiangyin Bridge, the Zhangjinggao Yangtze River Bridge connects the three cities of Zhangjiagang, Jingjiang, and Rugao. Its construction will achieve six "world firsts" and break six "world records." China Railway Shanhaiguan Bridge Group is responsible for a total of approximately 115,500 tons of steel structure manufacturing tasks, covering the core components of the south waterway bridge and the north approach works.
To address the bridge's innovative L-rib orthotropic steel deck structure, China Railway Shanhaiguan Bridge Group developed an automatic positioning and assembly machine tool for L-rib panel units. This equipment is fitted with 13 welding heads, capable of simultaneously performing double-sided positioning welding on 13 L-ribs, with assembly precision controlled within ±0.5 millimeters, effectively overcoming the challenges of controlling perpendicularity and gaps between the L-ribs and the deck plate.
To tackle issues such as significant welding deformation and difficult linear control arising from the super-wide, long-span, and thin-plate structure, China Railway Shanhaiguan Bridge Group is seeking productivity gains through digitalization. The project utilizes specialized position-based anti-deformation welding machines and anti-deformation jigs, featuring real-time tracking of the weld root, with welding deviation controlled within 0.2 millimeters, effectively suppressing deformation through both process and equipment. Furthermore, from BIM 3D modeling to the establishment of a "weld map," every weld seam has its own "ID card." Through an intelligent welding management platform, managers can monitor welding parameters in real-time, achieving a leap from "experience-based welding" to "data-driven welding."
The Zhangjinggao Yangtze River Bridge is a major transportation project under China's 14th Five-Year Plan and a crucial passageway for the national strategies of Yangtze River Delta integration and the development of the Yangtze River Economic Belt. Upon completion, it will optimize the layout of cross-river passages along the Yangtze River trunk line, promote cross-river integrated development, and provide significant support for building a high-level Yangtze River city cluster.
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