Core Insights - The completion of the upper beam on the south main tower of the Zhang Jinggao Yangtze River Bridge marks a significant milestone in the construction process, transitioning from the substructure to the superstructure phase [1][2] - The bridge, featuring a main span of 2300 meters, is recognized as the world's largest span suspension bridge, with both main towers standing at 350 meters, making them the tallest suspension bridge towers globally [1] - The innovative "steel box-steel pipe concrete constraint combination system" used in the main towers reduces the self-weight by approximately 50% while enhancing wind and seismic resistance by 30% [1] Construction Details - The construction of the south main tower took over 630 days, involving meticulous organization for each lifting and precise alignment of segments, showcasing the team's dedication and expertise in bridge engineering [2] - The upper beam installation involved three segments, with the heaviest segment weighing 262 tons, utilizing the world's first 10,000-ton meter tower crane and advanced full-section welding techniques [1] - The project team employed 3D digital technology for simulation, achieving high precision in the welding seam width, controlled between 6 to 10 millimeters, ensuring a stress-free and accurate connection during the assembly [1] Future Implications - The Zhang Jinggao Yangtze River Bridge is expected to be completed by 2028, significantly reducing travel time between Suzhou Zhangjiagang, Taizhou Jingjiang, and Nantong Rugao, thereby optimizing the layout of the Yangtze River mainline crossing channels [2]