长江下游，江阴水面，百舸争流、络绎不绝。水下54米深处，一条"巨龙"横跨南北，连接长江两岸。这 条长约6.4公里的"巨龙"，正是主体结构刚刚完工的江阴靖江长江隧道。 2023年2月，该隧道施工过程中，盾构机突遭意外无法继续向前推进，导致原计划单向掘进的工程方案 难以为继。面对突如其来的变故，中交一公局集团隧道局建设团队思虑再三，决定挑战一条此前未曾设 想过的道路——从江对岸重新始发一台盾构机，让两台盾构机在滚滚长江深处"握手"对接。 "历时两年多，我们先后攻克了精准对接、冻结控水、精细拆解等施工难题，让这一突破常规思维的施 工方案最终成为现实。"中交一公局集团专业总工程师姚占虎告诉科技日报记者，江阴靖江长江隧道主 体结构完工，标志着我国成功突破了高水压强渗透软土地层大直径盾构江底对接的世界级难题。 "针尖对麦芒" "当时隧道已经在江底掘进了3.2公里，突然停住前进不了，剩下1.7公里大家不知道该怎么办。"迷茫、 无助，笼罩着江阴靖江长江隧道项目经理梁玉强和建设团队。 面对这一国内外罕见的"江底困局"，建设团队没有被困难击垮，大家开始集思广益，研提方案：重新选 线新建一条隧道？或是江面打竖井接收？这些方案对"黄 ...

Core Viewpoint - The completion of the Jiangyin-Jingjiang Yangtze River Tunnel marks a significant technological breakthrough in tunnel engineering in China, overcoming world-class challenges related to high water pressure and strong permeable strata [1] Group 1: Project Overview - The Jiangyin-Jingjiang Yangtze River Tunnel spans approximately 11.825 kilometers, with an underwater shield section of about 4,937 meters and a diameter of 16.09 meters [1] - The project faced complex geological conditions, including high water pressure and large diameter requirements [1] Group 2: Technological Innovations - The project team from China Communications First Highway Engineering Group developed a complete set of technologies for high water pressure and strong permeable sand layer tunneling, which has broken the length limit for single-shield tunneling [1] - This technological advancement enables the construction of ultra-long-distance shield tunnels, providing valuable experience and technical reserves for future mega-engineering projects across rivers and seas [1] Group 3: Economic and Regional Impact - As a key project in the comprehensive transportation corridor planning of the Yangtze River Economic Belt, the tunnel will significantly alleviate traffic pressure on the Jiangyin Yangtze River Bridge and enhance the crossing capacity of the Yangtze River main line [1] - The completion of the tunnel is expected to promote high-quality integrated development in the Yangtze River Delta region [1]

Core Viewpoint - The successful "millimeter-level" docking of two shield machines in the Jiangyin-Jingjiang Yangtze River Tunnel marks the completion of the main structure of this national key project, advancing deep, large-section, long-distance shield tunnel technology and providing critical technical achievements and practical experience for complex geological cross-river and sea super-engineering projects [1] Group 1 - The Jiangyin-Jingjiang Yangtze River Tunnel, constructed by China Communications First Public Bureau Group Tunnel Bureau, features a total length of 4,937 meters and a maximum excavation diameter of 16.09 meters, making it the largest diameter and highest water pressure shield tunnel under construction in China [1] - The project addresses world-class challenges such as shield machine stability and precise docking under high water pressure and strong permeable strata, offering a complete "Chinese solution" for similar global projects [1] - The tunnel is a key project in the comprehensive three-dimensional transportation corridor of the Yangtze River Economic Belt, which will significantly alleviate traffic pressure on the Jiangyin Yangtze River Bridge and enhance the crossing capacity of the Yangtze River trunk line [1]

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]

Core Insights - The construction activities along the Yangtze River and Jianghuai Plain are experiencing a significant surge, with a focus on enhancing transportation infrastructure and logistics efficiency [1][2][4] Investment and Progress - In the first three quarters, the province completed transportation fixed asset investment of 185.8 billion yuan, accounting for 80.8% of the annual investment plan, exceeding the scheduled progress [1] - The province aims to complete a total transportation investment of 230 billion yuan for the year, ensuring high-quality completion of various work targets [1] Railway Construction - The North Jiangsu High-Speed Railway is progressing rapidly, with the completion of 98% of box girder erection and plans to finish beam erection by the end of November [2] - The total investment in railway projects reached 40.069 billion yuan in the first three quarters, with a strong push to meet annual construction targets in the fourth quarter [3] Bridge and Tunnel Developments - The Zhang Jinggao Yangtze River Bridge construction is advancing, with key engineering components like pile foundations and segment beams being completed [4] - The Jiangyin-Jingjiang Yangtze River Tunnel is also progressing, with 80.27% of the annual plan completed, expected to be operational by 2028, significantly reducing crossing time [5] Highway Expansion - The expansion of the Hu-Wu Expressway is underway, with 90.9% of the annual plan completed, aiming for basic completion by the end of the year [6] - The Jiangsu section of the Weishan-Suzhou High-Speed Railway has initiated box girder prefabrication and erection, transitioning to upper structure construction [3][7]

Group 1: Infrastructure Investment - In the first quarter, Jiangsu province completed a total transportation fixed asset investment of 564.3 billion yuan, representing a year-on-year increase of 5.8%, which accounts for 24.5% of the annual investment plan, marking the highest level for the same period in history [1] - The Changtai Yangtze River Bridge, a major project, completed an investment of 1.1 billion yuan in the first quarter, which is 60% of its annual investment plan [2] - The Zhangjinggao Yangtze River Bridge achieved an investment of 7.34 million yuan in the first quarter, with construction progressing rapidly through technological innovation [3] Group 2: Tunnel and Bridge Construction - The Jiangyin-Jingjiang Yangtze River Tunnel, currently the highest water pressure shield tunnel in China, completed its shield tunneling and is advancing with the construction of the main structure [3] - The Haitai Yangtze River Tunnel is progressing with the right line shield machine completing 81 rings of advancement, while the left line assembly is 40% complete [3] - The expansion of the Jiangsu highway network is underway, with significant progress in the Changshen, Huwu, Xiyi, and Yangli highways, with over 10 billion yuan invested in the first quarter [4][5] Group 3: Railway Development - The North Jiangsu High-Speed Railway construction is progressing, with the main tower of the bridge surpassing 100 meters in height [6] - The Nanjing metropolitan area intercity railway construction is also advancing, with various structural components nearing completion [6] - In the first quarter, the railway projects in Jiangsu achieved multiple milestones, with the Nanjing-Huai'an intercity railway and the North Jiangsu High-Speed Railway showing significant progress [7]