世界最大跨径四主缆悬索桥燕矶长江大桥合龙

Core Viewpoint - The completion of the Yanjing Yangtze River Bridge marks a significant achievement as it is recognized as the world's largest span four-cable suspension bridge, with the main structure now finished [1][2]. Group 1: Project Overview - The Yanjing Yangtze River Bridge spans approximately 26 kilometers, featuring a main span of 1860 meters. The upper deck accommodates a six-lane expressway with a design speed of 100 km/h, while the lower deck serves a four-lane urban expressway with a design speed of 80 km/h [2]. - The bridge's main tower stands at 184 meters, achieving an unprecedented span-to-height ratio of 1:15 among thousand-meter-level suspension bridges [2]. Group 2: Technical Innovations - The construction team implemented a world-first design of a double-layer suspension bridge with different cable heights and lengths, which helps distribute loads and enhance stability [2]. - A total of 69 beam segments were used in the main span, with each standard segment measuring 27 meters in length, 41 meters in width, and 9.5 meters in height, weighing approximately 830 tons. The total weight of the bridge is around 56,000 tons [5]. Group 3: Construction Techniques - The project utilized 1436 suspension cables and introduced a large-scale application of fully welded cable clamps, totaling 544 sets, which contributed to the lightweight and standardized manufacturing of the clamps [5][6]. - Precise monitoring and measurement of environmental factors such as temperature and wind were conducted to ensure the accurate installation of the steel beams, achieving millimeter-level precision during the final assembly [6]. Group 4: Economic Impact - The Yanjing Yangtze River Bridge is a critical infrastructure project that connects Ezhou and Huanggang, enhancing economic and transportation links between the two cities and significantly improving the regional comprehensive transportation system, including road, rail, water, and air [6].