世界最长海底高铁隧道建设取得重大突破 中新网杭州11月28日电(王逸飞 许文峰 余剑波 周俊)28日，在甬舟铁路金塘海底隧道舟山侧施工现 场，"定海号"盾构机掘进里程成功突破5000米大关，标志着该隧道全长6270米的舟山侧盾构段已完成约 80%的掘进任务，世界最长海底高铁隧道建设取得重要进展。 建设团队庆祝"定海号"盾构机掘进突破5公里。中铁十一局供图 金塘海底隧道地质条件极为复杂，盾构段需穿越长距离硬岩、黏土与粉砂复合地层，施工面临高强度、 高水压、高精度与高风险等多重挑战。目前，"定海号"已进入海底砂层掘进阶段。针对砂层透水性强、 稳定性差等问题，建设团队通过加强盾尾密封管理、优化掘进参数、合理控制推进速度等措施，有效控 制地层扰动，并结合同步注浆与实时监测，动态调整盾构姿态，保障施工安全。 随着隧道埋深加大，地质条件日益复杂，施工风险持续上升，对人员操作和设备运行提出更高要求。为 此，项目团队特邀盾构专家对设备进行全面"体检"，确保其处于良好工作状态，并利用管片拼装、交接 班等工序间隙开展"碎片化"维保，提升施工连续性和整体效率。 金塘海底隧道是甬舟铁路全线控制性工程，横跨宁波与舟山之间的金塘水道，全 ...

Group 1 - The Ningbo-Zhoushan Railway's Jintang underwater tunnel has achieved a significant milestone, with the domestic shield machine "Yongzhou" surpassing 2,470 meters in excavation, marking over half of the progress on the Ningbo side [1][2] - The Jintang underwater tunnel is a key project of the Ningbo-Zhoushan Railway, stretching 16.18 kilometers, with an underwater section of 11.21 kilometers, making it the longest underwater high-speed railway tunnel in the world [2] - The completion of the Jintang underwater tunnel will connect Zhoushan, the only city in the Yangtze River Delta without a railway, to the national railway network, significantly reducing travel time from Hangzhou to Zhoushan to just over one hour [2] Group 2 - The Hangzhou-Qiuzhou High-Speed Railway has initiated contact network hot sliding tests, paving the way for subsequent joint debugging and testing [3] - The Hangzhou-Qiuzhou High-Speed Railway spans approximately 131 kilometers with a design speed of 350 kilometers per hour, featuring six stations and a bridge-tunnel ratio of 78.7% [3] - Once operational, the Hangzhou-Qiuzhou High-Speed Railway will enhance regional transportation and economic integration, contributing to the high-quality development of Zhejiang Province and the Yangtze River Delta [3]

Core Insights - The "Yongzhou" shield machine has achieved over half of its tunneling progress for the world's longest underwater high-speed rail tunnel, marking a significant milestone in the construction of the Ningbo-Zhoushan railway [1][3]. Group 1: Project Overview - The Jintang underwater tunnel is a key project of the Yongzhou railway, stretching 16.18 kilometers, with the shield section measuring 11.21 kilometers [3]. - The tunnel employs two shield machines, "Yongzhou" and "Dinghai," which are advancing simultaneously from both Ningbo and Zhoushan sides [3]. Group 2: Technical Challenges - The geological conditions along the Jintang underwater tunnel are extremely complex, requiring the crossing of various risk sources such as sea dikes, docks, and shipping lanes [4]. - The maximum depth of the underwater section reaches 78 meters, with a maximum water pressure of 8.4 bar, equivalent to nearly 1 ton of weight on an adult's palm [4]. - The Ningbo side has experienced frequent geological changes, necessitating high-pressure tool changes, with the "Yongzhou" machine completing 12 geological transitions and changing tools over 2400 times [4]. Group 3: Strategic Importance - The Yongzhou railway is a major project in China's Medium- and Long-term Railway Network Plan (2016-2030), with a total length of 76.4 kilometers and a design speed of 250 kilometers per hour [4]. - Once operational, the project will connect Zhoushan, the only city in the Yangtze River Delta without a railway, to the national railway network, significantly enhancing regional integration and development [4].

Group 1: Transportation Infrastructure Developments - The Hangzhou Metro Line 18, a key transportation line, has commenced construction with the launch of the "Kaitian" tunneling machine, marking the first application of a super-large rectangular tunneling machine in metro parking line construction [2] - The Hangzhou Metro Line 18 will span 48.3 kilometers with 19 stations, enhancing connectivity between the main urban area and the suburban regions of Linping and Xiaoshan, particularly filling the metro gap in areas like Wenyuan and Yiqiao [2] - The Jiaxing Nanhu Airport has successfully completed its verification flight, with plans to officially commence operations by the end of this year, following a thorough inspection of its facilities and flight procedures [3] Group 2: Railway Connectivity Enhancements - The successful completion of the Xujiashan Tunnel marks the progress of the Ningbo-Zhoushan Railway, which is a significant project in China's medium to long-term railway network plan [4] - The Ningbo-Zhoushan Railway will cover a total length of 76.4 kilometers, connecting Ningbo East Station to Zhoushan, and will include 7 stations, facilitating high-speed rail access to the previously isolated Zhoushan region [4] - Once operational, the railway will end the historical lack of railway access in Zhoushan, providing a new travel option between Hangzhou and Zhoushan [4]

Core Insights - The completion of the 20th main pier foundation pouring for the Fuchimen dual-use bridge marks a significant milestone in the construction of the Ningbo-Zhoushan Railway, which is a major project in China's medium- and long-term railway network plan [1][2] Group 1: Project Overview - The Ningbo-Zhoushan Railway spans 76.4 kilometers, connecting Ningbo East Station to Baichuan Town in Dinghai District, and will end the historical lack of railway access in the Zhoushan archipelago [1] - The Fuchimen dual-use bridge, a key control project of the railway, is 1,726 meters long and features a "road-rail flat layer" design, with a railway in the middle and roads on both sides [1] Group 2: Engineering Features - The bridge boasts two world records: the main span of 388 meters is the largest for a high-low tower dual-use bridge, and it features the widest cantilever steel box girder bridge [2] - The bridge employs a unique design with a bridge tower penetrating the cantilever steel box girder, a global first [2] Group 3: Construction Details - The 20th main pier foundation was poured in two stages, with the first stage at 2.25 meters and the second at 4.25 meters, using approximately 4,300 cubic meters of concrete [2] - A smart temperature control system was implemented to monitor and adjust the temperature of the large volume of concrete, ensuring quality control during the pouring process [2]

Core Insights - The Chinese government emphasizes the importance of labor in achieving high-quality development and modernization, urging workers to actively participate in significant construction projects during the "May Day" holiday [1] Infrastructure Development - During the "May Day" holiday, major construction projects, including the Western Land-Sea New Corridor and the Pinglu Canal, are progressing with nearly 20,000 workers and over 4,400 machines involved [1] - The Pinglu Canal will provide the shortest and most economical route from Guangxi and Southwest China to ASEAN countries upon completion [1] - The Ningbo-Zhoushan Railway's underwater tunnel, the longest of its kind globally, is expected to be completed by 2027, significantly reducing travel time between Ningbo and Zhoushan [2] Water Conservancy Projects - The South-to-North Water Diversion Project's follow-up, the Middle Line Jiangjin Supplementary Han Project, is advancing, enhancing water distribution capabilities in the Han River basin [4] - In the first quarter, eight major water conservancy projects were initiated, with investment exceeding the same period last year [4] Energy Sector Advancements - A large-scale integrated energy project, "Long Electric into Shandong," is nearing completion, expected to deliver over 36 billion kilowatt-hours annually, with over 50% from renewable sources [5] - Wind and solar power projects are being developed faster than anticipated, with installed capacity increasing from 535 million kilowatts at the end of 2020 to 1.482 billion kilowatts by March 2025, marking a 177% growth [6] Overall Economic Impact - As of now, 99% of the 102 major projects outlined in the "14th Five-Year Plan" have met their targets, significantly supporting high-quality economic and social development [7]