速度与精度并重！大工程筑牢区域发展“快车道”

Core Insights - China's transportation construction sector has achieved significant breakthroughs in early December, showcasing its robust infrastructure capabilities and commitment to high-quality regional development [1] Group 1: Xiamen-Jinmen Bridge - The main tower of the Xiamen section of the Xiamen-Jinmen Bridge has been completed with "millimeter-level" precision, marking a transition to the critical construction phase of cable-stayed bridge assembly [2] - The Liu Wudian Navigation Bridge, part of the project, spans 1,948 meters with a main span of 928 meters and a tower height of 178.1 meters, constructed using 60 steel shell segments and two steel crossbeams [2] - The project team overcame significant technical challenges, achieving a deviation of only 0.5 parts per ten thousand, approximately 9 millimeters, through digital control and precision instruments [2] Group 2: Chongqing Jiangnan Tunnel - The Jiangnan Tunnel, a key project in Chongqing, has been completed and opened to traffic, significantly improving connectivity between the Nanping and Chayuan areas [4] - The tunnel spans 5.55 kilometers with a design speed of 60 km/h, and the travel time between Nanping and Chayuan has been reduced from 30 minutes to 10 minutes [4] - The project faced geological challenges, including karst water-rich areas, and took 52 months to complete [4] Group 3: Nanning-Pingxiang High-Speed Railway - The Nanning to Pingxiang high-speed railway has been fully opened, providing a rapid transit route to the Vietnam border, with travel time reduced to 75 minutes [5] - The railway spans 81 kilometers with a design speed of 250 km/h, and the opening of this line enhances the connectivity of Guangxi's railway network [5] - Initial operations will include four pairs of trains daily, significantly reducing travel times compared to conventional trains [5] Group 4: Overall Significance - The simultaneous achievements in bridge construction, tunnel completion, and high-speed rail connectivity reflect not only engineering advancements but also the practical application of development concepts [6]