成渝中线高铁沱江特大桥顺利合龙

Core Points - The main beam of the Tuojiang Grand Bridge, a key project of the Chengyu Middle Line High-Speed Railway, successfully completed its closure on November 10 in Jianyang, Sichuan [1][3] - The bridge spans 1252 meters and features innovative design solutions to address construction challenges, including a no-thrust arch bridge structure [3] Group 1: Construction Challenges and Innovations - The main arch, weighing 2200 tons and measuring 174 meters, was lifted 21.7 meters with a height difference of no more than 20 millimeters at four lifting points, likened to "airborne embroidery" [3] - A virtual assembly technology was utilized for repeated simulations to ensure precise lifting speed and posture, allowing eight welders to work simultaneously at a height of 103 meters above the river [3] - The main beam closure required a 5000-ton horizontal tensioning method, with high precision demands, supported by a construction monitoring information system to dynamically adjust parameters and control errors to the millimeter level [3] Group 2: Project Overview and Significance - The Chengyu Middle Line High-Speed Railway has a total length of 292 kilometers and is designed for a speed of 350 kilometers per hour [3] - This project is a crucial part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, enhancing connectivity between the Yangtze River Economic Belt and the Chengdu-Chongqing urban agglomeration [3]