浙江海盐：世界最长跨海铁路桥顺利上梁

Core Viewpoint - The successful installation of the first 80-meter precast concrete box girder marks a significant milestone in the construction of the Hangzhou Bay Cross-Sea Railway Bridge, entering a new phase of superstructure construction [1][2] Group 1: Project Milestones - The first 80-meter precast concrete box girder, weighing 2800 tons, has been successfully erected, setting a new world record for the largest span of precast concrete box girders [1] - The bridge construction is progressing as planned, with the main bridge structure expected to be completed by the end of 2026 and the entire project to be operational by the end of 2027 [2] Group 2: Engineering Challenges - The construction site presents complex challenges due to strong tidal currents, typhoons, and unstable seabed conditions, with a maximum tidal range of 8.96 meters and a maximum flow velocity of 5.3 m/s [1] - The "Tianyi" vessel, designed specifically for this project, has a maximum lifting capacity of 3600 tons and integrates the entire process of lifting, transporting, and erecting the girders [2] Group 3: Technological Innovations - The "Tianyi" vessel employs advanced technology, including 85 sets of smart sensors for real-time monitoring of vessel status, structural stress, and lifting actions, ensuring precise control during the construction process [2] - The construction team utilizes precise tidal calculations to optimize the timing of lifting and transporting girders, achieving millimeter-level accuracy in the installation process [2] Group 4: Strategic Importance - The Hangzhou Bay Cross-Sea Railway Bridge, with a total length of 29.2 kilometers and a design speed of 350 kilometers per hour, is set to enhance the transportation network in the Yangtze River Delta region, contributing to high-quality integrated development [2]