渝万高铁五步河双线特大桥全长1796米，共设计48个墩台，其中墩高超过50米的20个，跨越S207省道及长江支流五步河，主跨采用连续刚构，总跨度达392 米，桥址区域环境敏感性高，具有安全风险高、技术难度大、工期压力紧等多重挑战。施工方中铁十二局在五步河双线特大桥构建了以"桥梁智能建造平台 +智能悬臂造桥机"为核心的新型桥梁建设管理模式，持续推动大跨度连续刚构施工持续向建设数字化、决策智能化、管理精细化转型升级，顺利实现大跨 度梁体的毫米级精确合龙。 9月24日，重庆至万州高速铁路五步河双线特大桥顺利合龙，为全线按期通车奠定坚实基础。 w a 10 41 2 2 2 2 10000 1 45 Pa 12 6 re 8 A 12 SHARH 14:4 r a 8 8 - 1 2 rest in H se all a A -10 b 1 title . 147 4 184 x 0 0 0 0 the 重庆至万州高速铁路正线全长251公里，设计时速350公里，是国家"八纵八横"高速铁路主通道包（银）海、京昆通道的重要组成部分。建成通车后，将有力 促进渝东北三峡库区城镇群和主城都市区的便捷联系，极大便利沿线群众出行， ...

Core Viewpoint - The article reports a tragic accident during the construction of the Qianzhai Yellow River Grand Bridge, resulting in multiple casualties and highlighting the risks associated with large-scale infrastructure projects [1][4]. Group 1: Incident Details - On August 22, a steel strand broke during the tensioning operation, leading to the fall of 16 workers, with 12 confirmed dead and 4 missing as of 6 PM the same day [1]. - The Qinghai Province has initiated a level three emergency response to manage the situation [1]. Group 2: Project Overview - The Qianzhai Yellow River Grand Bridge is constructed by Lanzhou-Xinjiang Railway Gansu-Qinghai Co., Ltd., designed by China Railway First Survey and Design Institute Group Co., Ltd., and built by China Railway Bridge Bureau Group Co., Ltd. [4]. - The bridge features a continuous steel truss arch design with spans of "141 meters + 366 meters + 141 meters," totaling 648 meters, recognized as the "world's first span" railway continuous steel truss arch bridge and the first railway steel truss arch bridge crossing the Yellow River in China [4]. Group 3: Construction Progress - As of June 14, the temporary steel structure tower for the bridge was successfully topped out, laying a solid foundation for the main span steel beam closure, which was scheduled for completion in August [4].

Core Viewpoint - The steel truss girder of the Hanjiang Grand Bridge for the Xi-Shi High-Speed Railway in Shiyan, Hubei, is about to be completed, marking a significant milestone in the construction of this railway project [1][2][3][4][5] Group 1 - The Xi-Shi High-Speed Railway is a crucial infrastructure project aimed at enhancing transportation connectivity in the region [1][2] - The completion of the steel truss girder is expected to facilitate the overall progress of the railway construction [3][4] - The Hanjiang Grand Bridge is a key component of the Xi-Shi High-Speed Railway, showcasing advanced engineering techniques [5]