2月11日，中铁十四局技术人员在甬舟铁路金塘海底隧道"甬舟号"盾构机内配合管片拼装作业。甬舟铁 路金塘海底隧道西起浙江宁波市北仑区，东至舟山市金塘镇，全长16.18公里，是世界最长海底高铁隧 道。目前，"甬舟号"盾构机已累计掘进超过3146米，完成了宁波侧总任务量的六成以上。据了解，春节 期间，施工现场有150余名建设者选择留下，项目团队将24小时轮班掘进与监控，确保盾构机在海下姿 态精准，并对盾构机进行全面的检查维护和保养。新华社记者黄宗治/摄 （来源：中华工商时报） 转自：中华工商时报 ...

金塘海底隧道是甬舟铁路控制性工程，西起宁波市北仑区，东至舟山市金塘岛，全长16.18公里，其中 盾构段长11.21公里。施工采用两台盾构机从宁波侧和舟山侧同时始发，相向掘进，最终在海底实现精 准对接。隧道建成后，将结束舟山不通高铁的历史。 临近春节，浙江宁波。风平浪静的金塘水道上方，海风吹拂，波光粼粼。乘车一路下探到地下70米处， 一条"钢铁巨龙"正在"吃进"大量岩土，延伸海底通路。 甬舟铁路金塘海底隧道宁波侧施工现场，总长135米、总重约4350吨的国产超大直径盾构机"甬舟号"， 执行的是世界最长海底高铁隧道的掘进任务。 早上7点，走进贴着火红窗花的操作室，中铁十四局甬舟铁路项目盾构机机长栗晨脱下厚重的工装外 套，坐在驾驶台前。 刀盘转速、推进速度、盾构机姿态……接下来的12个小时，栗晨要紧盯屏幕上200多组时刻刷新的数 据。每一个数据的异常波动，都可能意味着地层突变或设备异常。 "给'钢铁巨龙'做司机得胆大心细，要的是姿态平稳、匀速前行。"栗晨手指在控制按钮间精准游走，调 整"甬舟号"的掘进姿态，将其和隧道中心轴线的偏差，始终保持在2厘米以内。 "盾构机开工后昼夜不停，以日均6到8米的速度持续掘进，现在里 ...

Core Viewpoint - The Yongzhou Railway's Jintang Undersea Tunnel, spanning 16.18 kilometers, is set to become the world's longest undersea high-speed rail tunnel, with completion expected in 2026 [1] Group 1 - The tunnel starts from Beilun District in Ningbo, Zhejiang Province, and ends at Jintang Town in Zhoushan City [1] - It utilizes two large-diameter shield machines, named "Dinghai" and "Yongzhou," which will commence excavation from both ends simultaneously [1] - The project aims to achieve high-precision alignment in complex underwater geological conditions [1]

Core Points - The Ningbo-Zhoushan Railway's underwater tunnel, known as the Jintang Submarine Tunnel, is a record-breaking engineering project, measuring 16.18 kilometers in total length, with an underwater section of 11.21 kilometers, making it the world's longest underwater high-speed rail tunnel [1][5] - The construction employs two shield machines that start from both Ningbo and Zhoushan sides, facing each other to ensure precise alignment after traversing complex geological conditions [1][2] - The project is significant for the integration of the Yangtze River Delta region, as it will end the historical lack of railway access to Zhoushan upon completion [5] Construction Details - As of May 2024, the shield machine has advanced nearly 2,400 meters, currently located about 65 meters below sea level, marking a critical phase as it transitions from land to marine construction [2] - The shield machine must navigate through various geological layers, including four soft soil sections and eight hard rock sections, with hard rock layers comprising nearly 70% of the total [2][4] - Advanced technologies, such as a proactive geological forecasting system, are utilized to monitor geological conditions ahead of the shield machine, enhancing safety and efficiency [4] Workforce and Timeline - The project employs over 200 workers who operate in two shifts around the clock, with the tunnel expected to connect with the Zhoushan side by the end of 2026 [5] - The project is positioned as a key initiative within China's 14th Five-Year Plan, emphasizing the urgency and commitment to high-quality project execution [5]

Core Points - The Ningbo-Zhoushan Railway's underwater tunnel, known as the Jintang Submarine Tunnel, is a record-breaking engineering project, measuring 16.18 kilometers in total length, with an underwater section of 11.21 kilometers and a maximum depth of 78 meters, making it the world's longest underwater high-speed rail tunnel [2][3] - The construction employs two shield machines that start from both Ningbo and Zhoushan sides, advancing towards each other while navigating high water pressure and complex geological conditions [2] - The project is significant for the integration of the Yangtze River Delta region, as it will end the historical lack of railway access to Zhoushan upon completion in late 2026 [7] Construction Details - As of May 2024, the shield machine has advanced nearly 2,400 meters, currently located about 65 meters below sea level, marking a critical phase as it transitions from land to marine construction [3] - The shield machine must traverse various geological layers, including 4 segments of soft soil and 8 segments of hard rock, with hard rock layers comprising nearly 70% of the total [3] - Advanced technologies, such as a proactive geological forecasting system, are utilized to enhance the precision of geological assessments and improve construction safety [5] Workforce and Project Management - The project employs over 200 workers who operate in two shifts around the clock to ensure continuous progress [7] - The project team is committed to maintaining high-quality standards and timely completion, aligning with the goals of the 14th Five-Year Plan [7]

Core Points - The Ningbo-Zhoushan Railway's Jintang underwater tunnel is a record-breaking engineering project, measuring 16.18 kilometers in total length, with an underwater section of 11.21 kilometers and a maximum depth of 78 meters, making it the world's longest underwater high-speed rail tunnel [1][2] - The construction employs two shield machines that start from both Ningbo and Zhoushan sides, facing complex geological conditions, including high water pressure and various soil types [1][2] - The project utilizes advanced technologies, such as a proactive geological forecasting system, to enhance construction efficiency and safety [3] Group 1 - The Jintang underwater tunnel is a key project for the Ningbo-Zhoushan Railway, with significant implications for regional connectivity and economic development [1][3] - The shield machine, named "Yongzhou," has already progressed nearly 2400 meters since its launch in May 2024, marking a critical milestone as it transitions from land to underwater construction [2] - The project team has designed the shield machine's cutter head to withstand the challenges posed by alternating soft and hard soil layers, which constitute nearly 70% of the tunnel's path [2][3] Group 2 - The construction site employs over 200 workers who operate in two shifts around the clock, aiming for high-quality and timely project completion by the end of 2026 [3] - The successful completion of the Jintang underwater tunnel will end the historical lack of railway connectivity to Zhoushan, contributing to the high-quality integration of the Yangtze River Delta region [3]

Core Viewpoint - The successful crossing of the "Yongzhou" shield machine into the marine section marks the commencement of the underwater construction phase of the world's longest underwater high-speed rail tunnel, the Jintang Undersea Tunnel, which is a critical project for the Yongzhou Railway [1] Group 1: Project Overview - The Jintang Undersea Tunnel is located beneath the Jintang Waterway, connecting Ningbo and Zhoushan, with a total length of 16.18 kilometers [1] - The shield section of the tunnel measures 11.21 kilometers, making it the longest underwater high-speed rail tunnel in the world [1] Group 2: Construction Milestone - The shield machine successfully traversed the seawall, transitioning from land to marine excavation, indicating significant progress in the construction timeline [1]