Core Points - The completion of the main towers 3 and 4 of the Chongqi Railway and Highway Yangtze River Bridge marks a significant milestone in the construction of the world's largest span railway and highway cable-stayed bridge [1][2] - The bridge, part of the Shanghai-Chongqing-Lanzhou high-speed railway, spans 4.09 kilometers and features a main span of 400 meters, designed for high-speed rail and intercity rail traffic [1][2] Summary by Sections Construction Details - The main towers are H-shaped reinforced concrete structures, each 153 meters tall, consisting of seven parts including the tower base and top [2] - The project faced challenges due to complex geological conditions, particularly soft sandy soil, which complicated the construction of the foundation piles [2] - The bridge's construction highlights include a total steel beam push length of 1205.4 meters, a new structural design combining concrete slabs and steel trusses, and precise control of construction processes [2] Strategic Importance - Upon completion, the bridge will enhance the railway network layout along the Yangtze River, contributing to the integrated high-quality development of the Yangtze River Delta region [4]

Core Points - The construction of the Chongqi Railway and Highway Yangtze River Bridge, the world's largest span railway and highway cable-stayed bridge, is currently underway, marking a significant milestone in infrastructure development [1][3] - The bridge will allow for a high-speed crossing of the Yangtze River at a speed of 350 km/h without reduction, enhancing transportation efficiency [1][5] Group 1: Bridge Specifications - The Chongqi Bridge spans 4.09 kilometers and features a dual-layer design, with the upper layer accommodating a six-lane highway and the lower layer designed for high-speed and intercity railways [3][4] - The main navigation span of the bridge reaches 400 meters, making it the largest span railway and highway cable-stayed bridge under construction globally [3][4] Group 2: Construction Challenges and Innovations - The construction faced challenges due to complex geological conditions, including soft sandy soil, and tidal influences affecting the construction process [4] - The project has achieved several records, including the longest steel beam push length of 1205.4 meters for a railway and highway bridge, and the implementation of a new structural design combining concrete slabs and steel trusses [4] Group 3: Economic and Regional Impact - The completion of the bridge is expected to optimize the railway network layout along the Yangtze River, contributing to the integrated development of the Yangtze River Delta and promoting high-quality growth in the region [5]

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