Group 1 - The Tongyu High-speed Railway's Haiyan Grand Bridge successfully completed its final concrete pouring on November 29, marking a significant milestone in the construction process [2] - The Haiyan Grand Bridge spans 221.7 meters with a main span of 100 meters, located above the Hangpu Expressway, presenting high safety risks and construction challenges [4] - The construction utilized advanced intelligent cantilever bridge machines, improving overall efficiency and reducing labor input, with construction precision controlled within millimeter levels [4] Group 2 - The Tongyu High-speed Railway runs over 300 kilometers from Nantong City in Jiangsu Province to Ningbo City in Zhejiang Province, with a design speed of 350 kilometers per hour and 11 stations along the route [7] - The completion of the Jiangyin-Jingjiang Yangtze River Tunnel's main structure on November 29 signifies a breakthrough in high-pressure, strong-permeability shield tunneling technology [7] - The Jiangyin-Jingjiang Yangtze River Tunnel is approximately 11.825 kilometers long, with a shield section of about 4,937 meters and a shield excavation diameter of 16.09 meters [9] - The tunnel is expected to be operational by the first half of next year, enhancing the traffic capacity of the Yangtze River trunk line and promoting high-quality integrated development in the Yangtze River Delta [11]