海太长江隧道北起南通海门、南至苏州太仓，线路全长39.07公里，过江隧道长11.185公里，其中盾构段长9315米，采用双向六车道高速公路设计标准，是 目前世界最长的公路水下盾构隧道。工程面临"超长距离、超大直径、超高水压、超大埋深、复杂工况"等挑战，盾构开挖直径超16.6米，最大埋深达75 米，最高水压7.5巴，沿线需穿越淤泥质粉质黏土与粉细砂等复合地层，技术难度与施工风险高。 自2025年4月盾构始发掘进以来，中铁十四局海太长江隧道项目团队依托丰富的穿江越海大盾构隧道施工经验和技术积累，驾驶着"江海号"盾构机依次安 全穿越立新河、江北大堤、新通海沙围堤，顺利进入长江水域。目前，"江海号"正以日均16米、月均480米的速度，在江底52米深处稳健掘进。 据悉，海太长江隧道工程的建设对落实长三角区域一体化发展和长江经济带发展国家战略，优化长江干线过江通道布局，推进扬子江城市群建设和跨江融 合发展有着重要意义。工程计划于2028年建成通车，届时，南通至苏州、上海的跨江通行时间将从1小时缩短至10分钟，有效疏解苏通长江大桥交通压 力，助力长三角"1小时经济圈"加速成型。 施工过程中，项目团队创新运用"数字盾构智慧管 ...

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]

Core Viewpoint - The construction industry is actively engaged in various infrastructure projects during the national holidays, showcasing dedication and responsibility among workers [1][2][3][4][5][6]. Group 1: Construction Activities - In Jiangxi, over 1,200 workers from China Railway 25th Bureau are working on the Bai Shi Qiu Bridge, which is crucial for subsequent rail laying [2]. - In Shaanxi, the construction of the Shenwa Railway is progressing with a focus on key projects like the Kuye River Bridge and the Caoduo Mountain Tunnel [2]. - In Guangxi, 415 workers are involved in the Guangxi Linning Expressway project, utilizing various heavy machinery to meet annual construction goals [3]. - In Hubei, hundreds of workers from China Railway 18th Bureau are working around the clock on the Yuefu High-speed Railway's Moon Mountain Bridge [3][4]. - In Jiangsu, the construction of the Nantong-Haitai Yangtze River Tunnel is advancing with a domestic shield machine achieving an average progress of 16 meters per day [5]. - In Guangdong, over 200 workers are tackling challenges in the Hezhang High-speed Railway project, particularly in areas with complex geological conditions [6]. Group 2: Worker Commitment - Workers express pride in contributing to significant infrastructure projects during the holidays, emphasizing the importance of their roles in improving transportation [3][4]. - Project leaders highlight the need for safety and progress, especially during holiday periods, to ensure timely completion of critical infrastructure [2][4][6].

Core Insights - The congestion at the Su Tong Bridge during the Golden Week holiday highlights the ongoing challenges faced by key river crossing channels in the Yangtze River Delta region [1][4] - The surge in private car ownership is identified as the fundamental cause of congestion, with the number of vehicles in Jiangsu province increasing from 14.58 million in 2010 to 27.66 million in 2024, a nearly 100% growth [4][5] - The existing road network is unable to accommodate the rising traffic demand, leading to frequent congestion during peak travel periods [5][6] Traffic Flow and Infrastructure - The Su Tong Bridge has a designed capacity of 80,000 vehicles per day, but actual daily traffic averages between 90,000 to 100,000 vehicles, with holiday traffic peaking at 140,000 to 150,000 vehicles [5] - The overall highway mileage in Jiangsu has only increased by less than 30% during the same period, exacerbating the supply-demand imbalance [4][5] - The lack of alternative routes further intensifies congestion, as the Su Tong Bridge remains the most efficient route for many travelers [6][7] Special Factors Contributing to Congestion - Additional pressures during this year's Golden Week include increased rainfall leading to slower driving speeds, construction-related traffic restrictions on connecting highways, and the overlap of the National Day and Mid-Autumn Festival holidays [8] - The potential for traffic accidents during high-volume periods can create chain reactions, significantly increasing congestion and complicating traffic management [8] Emergency Measures and Future Developments - Local authorities have implemented emergency measures to manage traffic flow, including increased police presence and the use of real-time monitoring systems to facilitate quick responses to incidents [9] - Future infrastructure developments, such as the second Su Tong crossing expected to begin construction in 2025, aim to alleviate traffic pressure on existing channels [7]

Core Viewpoint - The successful progress of the Jiangtai Yangtze River Tunnel and the North Yangtze River High-speed Railway projects highlights the effective integration of party-building initiatives into major infrastructure projects, enhancing construction efficiency and safety [1][2][3] Group 1: Project Achievements - The Jiangtai Yangtze River Tunnel has officially entered the critical phase of underwater excavation, marking a significant milestone as the world's longest underwater shield tunnel [1] - The North Yangtze River High-speed Railway has successfully completed the placement of the last 700-ton prefabricated box girder, showcasing the project's advancement [1] Group 2: Party-Building Initiatives - The implementation of a "five-party entry" party-building model has strengthened the organizational foundation at key projects, integrating party organizations into construction sites [1] - Regular activities such as "Project Classroom" have been established to disseminate party policies and theories to over 500 party members on-site [1] Group 3: Safety and Efficiency Measures - The establishment of 78 "Party Safety Pioneer Posts" has enhanced safety oversight, with party members taking the lead in ensuring safety and quality responsibilities [2] - A "Chief Service Officer" mechanism has been introduced, resulting in the completion of nearly 94% of housing relocation agreements within one month for the North Yangtze River High-speed Railway project [3] Group 4: Community and Worker Support - Over 80 supportive activities have been conducted to address the needs of frontline workers, enhancing their sense of belonging and security [3] - The integration of party-building efforts into project management has been recognized as a key factor in accelerating transportation infrastructure development in Haimen [3]

Core Insights - Jiangsu Province is accelerating the construction of water, land, and air infrastructure, showcasing significant "super projects" that reflect the speed of development in the region [1] Infrastructure Development - The Changtai Yangtze River Bridge, which began construction in 2019, is expected to be completed by 2025, significantly reducing travel time between Taizhou and Changzhou [1] - The Zhangjingao Yangtze River Bridge and the Haitai Yangtze River Tunnel, the latter being the world's longest underwater shield tunnel for road traffic, are also under construction [1] - Jiangsu has completed 20 cross-river passages, with multiple projects in progress, facilitating convenient travel for residents along the river and promoting the integration of cross-river urban clusters and the Yangtze River Delta [1] Economic Impact - These infrastructure projects are contributing to the high-quality economic development of the region [1]

Core Points - The "Cangyuan" shield machine, developed by China Communications Tunnel Bureau, has commenced its excavation phase for the Haitaichangjiang Tunnel A4 project, marking a significant advancement in high-end tunnel construction equipment in China [1] - The Haitaichangjiang Tunnel spans 39.07 kilometers, connecting Haimen District in Nantong City to Taicang City in Suzhou, and is designed to alleviate traffic flow from the Sutong Yangtze River Bridge [1] - The "Cangyuan" shield machine features a diameter of 16.66 meters, a total length of 176 meters, and weighs over 5,650 tons, making it the largest slurry balance shield machine independently developed in China [1] - The project integrates three core technologies, including a "digital brain" for intelligent control, "smart blade teeth" technology for efficient excavation, and a globally innovative "smart heart" active protection system [1] - The Haitaichangjiang Tunnel is a key project in the "Yangtze River Main Line Cross-River Channel Layout Plan (2020-2035)," aimed at enhancing cross-river transportation capabilities and promoting the integration of urban clusters along the river [1]

Core Points - The article discusses the commencement of the excavation phase for the Hai-Tai Yangtze Tunnel project, which is being constructed by China Communications Construction Company (CCCC) [1] - The tunnel spans 39.07 kilometers across the Yangtze River estuary, connecting Haimen District in Nantong City to Taicang City in Suzhou [1] - The "Cangyuan" shield machine, with a diameter of 16.66 meters and a total length of 176 meters, is the largest slurry balance shield machine independently developed in China, marking a significant breakthrough in high-end tunnel construction equipment [1] Technology and Innovation - The "Cangyuan" shield machine integrates three core technologies to address the challenges of ultra-long distance, large diameter, high water pressure, and deep burial [1] - It features a "digital brain" for intelligent control, "smart blade technology" to overcome efficient excavation bottlenecks, and the world's first "smart heart" active protection system [1] - The collaborative application of these innovative technologies provides dynamic safety assurance for the complex working conditions of the tunnel [1] Project Significance - The Hai-Tai Yangtze Tunnel is a key project in the "Yangtze River Mainline Cross-River Channel Layout Plan (2020-2035)" and is referred to as the "First Tunnel of the Yangtze River" [1] - Upon completion, the project will effectively divert traffic from the Sutong Yangtze River Bridge, optimize the layout of cross-river channels, and enhance the transportation support capacity and service level across the river [1] - The tunnel is expected to promote the integrated development of urban agglomerations along the Yangtze River [1]

Core Viewpoint - The commencement of the "Cangyuan" shield machine marks the start of the left line excavation for the Haitai Yangtze River Tunnel, entering the dual-line tunneling phase, which is a significant milestone for the project [2][4]. Project Overview - The Haitai Yangtze River Tunnel spans a total length of 39.07 kilometers, with the left line shield tunnel measuring 9,327 meters, designed to accommodate a six-lane expressway with a speed limit of 100 kilometers per hour [2][4]. - The project connects Haimen District in Nantong City to Taicang City in Suzhou, strategically located at the Yangtze River estuary [2][4]. Technical Specifications - The "Cangyuan" shield machine has a maximum excavation diameter of 16.66 meters, a total length of 176 meters, and weighs over 5,650 tons, making it the largest independently developed earth pressure balance shield machine in China [4]. - The right line of the tunnel began excavation on April 9 of this year and has progressed 1,300 meters [4]. Strategic Importance - The Haitai Yangtze River Tunnel is a key project in the "Yangtze River Main Line Crossing Channel Layout Plan (2020-2035)" and is prioritized in Jiangsu's "14th Five-Year Plan" for cross-river transportation [4]. - The completion of the project is expected to significantly contribute to the integration of the Yangtze River Delta region and the development of the Yangtze Economic Belt, enhancing the layout of crossing channels along the Yangtze River [4].

Core Insights - The successful installation of the cutter head for the "Cangyuan" shield machine marks a significant milestone in the construction of the Haitai Yangtze River Tunnel, which is the world's longest underwater road tunnel [1][2] - The Haitai Yangtze River Tunnel is a key project in China's strategic plan for the Yangtze River Economic Belt and is expected to be completed by 2028, enhancing transportation capacity and supporting regional integration [2] Group 1 - The "Cangyuan" shield machine has a cutting diameter of 16.66 meters and a total length of 176 meters, weighing over 5,650 tons, setting a new record for domestically produced large-diameter shield machines [1] - The cutter head, which is the core component of the "Cangyuan" machine, consists of one central block and six edge blocks, equipped with 365 cutting tools designed for complex geological conditions [1] - The tunnel project spans 39.07 kilometers, with a shield tunnel length of 9,327 meters, a maximum water pressure of 0.75 MPa, and a maximum burial depth of approximately 75 meters [1] Group 2 - The combination of soft soil cutter head with gradient distribution alloy tools forms a "super hard dragon tooth matrix," significantly improving excavation efficiency in quartz sand layers with about 65% content [2] - The Haitai Yangtze River Tunnel is part of the "Yangtze River Main Line Cross-River Channel Layout Plan (2020-2035)" and is a priority project for Jiangsu's 14th Five-Year Plan [2] - Upon completion, the tunnel will effectively divert traffic from the Sutong Yangtze River Bridge, contributing to the integrated development of the Yangtze River Delta region [2]