前天（11月23日），由沪杭公司建设、中铁隧道局集团承建的通苏嘉甬高铁江苏段首座最大跨度连 续梁拱组合桥——苏南特大桥跨白蚬江连续梁拱组合桥主跨顺利合龙，打通了14公里的重要架桥机通 道，标志着通苏嘉甬铁路建设取得关键胜利，为长三角南北向骨干通道、苏州"丰"字形国家干线铁路网 的南北主动脉建设注入强劲动能。 据了解，苏南特大桥地跨吴中区、吴江区两个行政区，总长25公里，多次跨越既有公路、河流湖 泊、居民区、工业厂房等建构筑物，技术要求高、施工难度大、安全风险高，是通苏嘉甬铁路控制性工 程之一，深受社会各界关注。作为苏南特大桥重点攻坚工程的跨白蚬江连续梁拱组合桥，上跨苏申外港 线Ⅲ级航道，采用（94+180+94）米预应力混凝土连续梁拱组合结构，施工工艺选用先梁后拱方案。主 梁为单箱双室变截面设计，采用挂篮法分段现浇施工；拱肋计算跨径180米，设计矢高36米，采用哑铃 型钢管混凝土截面，钢管直径1米，拱肋全高3米、腹板宽度0.7米；全桥共设置9道米字撑及17组双吊 杆。 工程建设过程中，项目坚持"首件制"样板引路，利用数智教培中心数字技术，建立全工序可视化方 案，实现施工工艺标准化、交底可视化，形成可复制的"样 ...

Core Viewpoint - The successful completion of the main span of the Su Nan Grand Bridge marks a significant milestone in the construction of the Tong Su Jia Yong High-Speed Railway, enhancing connectivity in the Yangtze River Delta region [1][2] Group 1: Project Overview - The Su Nan Grand Bridge spans 25 kilometers and crosses multiple existing roads, rivers, lakes, residential areas, and industrial sites, making it a key engineering project for the Tong Su Jia Yong Railway [1] - The main span of the bridge, known as the Niu Chang Jing continuous beam, measures 329.6 meters and employs a single-box double-chamber cross-section design with cantilever construction methods [1] - The project faces challenges due to its complex structure, high technical requirements, and dense surrounding rivers and complicated geological conditions [1] Group 2: Safety and Management - The construction unit prioritizes safety production, implementing a strict safety responsibility system with detailed division of responsibilities [2] - Daily safety management work lists are published to identify and eliminate potential hazards, ensuring project safety and stability [2] - A safety management atmosphere is fostered through various initiatives, including the involvement of community safety officers and monthly evaluations [2] Group 3: Strategic Importance - The Tong Su Jia Yong High-Speed Railway is a crucial part of the national medium- and long-term railway network planning, specifically the "Eight Verticals and Eight Horizontals" high-speed railway main corridor [2] - Once completed, the railway will significantly reduce travel time between core cities in the Yangtze River Delta, promoting high-quality development and integration in the region [2]