双主塔同日封顶！北沿江高铁崇启公铁长江大桥建设迎来重大进展

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]