北沿江高铁南京特大桥跨京沪铁路 转体梁成功转体

Core Viewpoint - The construction of the Shanghai-Nanjing-Hefei High-Speed Railway (North Jiangsu High-Speed Railway) has achieved a significant breakthrough with the successful rotation of a 6,300-ton turning beam, facilitating the subsequent box girder installation [1][5]. Group 1: Construction Details - The continuous beam measures 97.5 meters in length and is designed as a prestressed concrete box girder with a variable height and cross-section [3]. - The construction utilized a turning method, where the beam was first cast parallel to the railway on one side, with the 0 block constructed using a formwork support system, while the remaining segments were cast using a cantilever method [3]. - The entire beam segment was symmetrically pulled using two 200-ton jacks during the railway's operational "window period," achieving a precise 60-degree counterclockwise rotation to its designated position [3][5]. Group 2: Project Management and Safety - To ensure the successful execution of the turning operation, the project management team conducted thorough planning and multiple optimizations of the construction scheme, coordinating with local meteorological departments to select an optimal date for the operation [5]. - Prior to the turning operation, the beam was allowed to rest for 24 hours, and a monitoring team verified all measurement data and balance status [5]. - Key project elements, including counterweights, sliding tracks, and traction systems, were meticulously checked and signed off by supervisory and construction teams to ensure compliance with standards [5]. Group 3: Strategic Importance - The Shanghai-Nanjing-Hefei High-Speed Railway is a crucial segment of the eastern section of the Chongqing-Lanzhou High-Speed Railway and an important part of the national "Eight Vertical and Eight Horizontal" high-speed railway network along the Yangtze River [6]. - Once completed, the project will establish a rapid new corridor between the Shanghai metropolitan area, Nanjing metropolitan area, and Hefei metropolitan area, significantly enhancing the railway network layout in the Yangtze River region and supporting high-quality development in the Yangtze Economic Belt [6].