世界跨径最大钢拱桥凤来大溪河特大桥钢桁拱合龙

Core Points - The Fenglai Daxihe Grand Bridge, the world's largest steel arch bridge by span, successfully completed its steel truss arch closure on November 27 [1][3] - The bridge spans 1,136.7 meters, with a main bridge design of a 580-meter upper承式 steel box truss arch, making it the largest of its kind globally [3] - The bridge is located in a steep canyon area of Wulong District, with a height difference of over 310 meters from the bridge deck to the river surface, equivalent to the height of a 100-story building [3] - The total steel used in the bridge construction amounts to 25,000 tons [3] Engineering and Design - The design selected a more economical and suitable steel arch bridge construction scheme for the deep mountain canyon terrain, ensuring clearer stress distribution, relative safety, and easier construction [3] - During the construction process, the team overcame three major core challenges: stress and shape control of the fully bolted steel truss arch segments, posture adjustment of truss pieces in limited space, and digital assembly and timely shape correction of the arch ribs [3] Economic Impact - The Wulong to Liangjiang New Area Expressway, of which the bridge is a part, is the sixteenth line in Chongqing's highway network, connecting various tourist resources such as Xianren Mountain and Baima Mountain [3] - The completion of the expressway is expected to boost the development of local特色 agriculture and eco-tourism industries along the route [3]