央视网消息：新春佳节，万家团圆、尽享阖家欢乐之时，从供水一线到重点工程，从长江航道到高山景区，各行各业的建设者、守 护者坚守岗位不停歇，用责任与担当，守护万家安宁、保障民生安全。 南水北调不停工 守护供水"生命线" 南水北调东中线一期工程是1.95亿人的供水生命线。为确保春节期间供水安全，南水北调集团4000多名建设者和运行管理人员坚守岗 位，全力守护"一泓清水永续北上"。 甬舟铁路建成后，将结束舟山不通铁路的历史。届时，宁波至舟山的高铁全程最快仅需26分钟，杭州至舟山最快77分钟。 重庆：长江上的"流动哨所" 开启远航训练 武警重庆总队船艇支队的巡逻船艇被老百姓称为长江上的"流动哨所"。春节期间，这群"水上卫士"仍然在默默坚守岗位。随着指挥 员一声令下，武警重庆总队船艇支队多艘交通艇、登陆艇、巡逻艇组成的船艇编队解缆离泊，开启了水上远航训练。 武警重庆总队船艇支队 关廷清：此次航行训练不仅检验了船艇性能，更锻炼了我们遂行水上任务能力，提升了我们春节期间圆满完 成水上联勤巡逻的信心和底气。 天刚亮，陶岔渠首的工程巡查人员就已开始沿着千里长渠，对渠道边坡、输水建筑物等工程设施进行徒步巡查，守住渠道运行的第 一道 ...

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。 宁波侧盾构段要穿越高水压及多种复杂地层，经历24次频繁且差异极大的软硬地层交替变换。这种 软硬地层交替变换，对盾构机刀具、管道等磨损极大。"每掘进1米就要磕坏一颗'钢牙'，要及时对盾构 机刀盘内部的磨损刀具进行更换。"栗晨说。 人民日报记者 窦皓 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 ...

Core Insights - The construction of the world's longest underwater high-speed rail tunnel, the Yongzhou Railway, faces significant challenges, particularly with the "Yongzhou" shield machine encountering extreme geological conditions and high water pressure [1][3][5]. Group 1: Technical Challenges - The Yongzhou shield machine must navigate through 24 instances of soft and hard geological layers, with nearly 70% of the tunnel comprising unfavorable strata [3]. - The maximum rock strength encountered is 191 MPa, over six times that of ordinary concrete, and the tunnel's maximum depth reaches 78 meters, with a water-soil pressure of up to 8.5 bar [3][5]. - Frequent wear on the cutting tools necessitates manual intervention for tool replacement, with over 2,900 tools replaced to date [5][8]. Group 2: Innovative Solutions - To address the challenges, the "Deep Sea Space Station," a domestically developed shield saturation pressure entry technology, was created, allowing for safe operations at depths exceeding traditional limits [9][11]. - This technology integrates mature saturation diving techniques with shield tunneling, enabling workers to breathe a specific gas mixture and remain at depth without increasing gas absorption, thus stabilizing decompression times [11][16]. - The "Deep Sea Space Station" consists of multiple modules, allowing workers to live under equal pressure to the seabed and perform maintenance tasks efficiently [14][16]. Group 3: Project Progress - The "Deep Sea Space Station" successfully completed its first operation at a depth of 75 meters, conducting continuous work for 22 days and replacing 46 tools, which is crucial for the ongoing tunneling efforts [14][18]. - The Yongzhou shield machine has now advanced over 3,000 meters, completing more than 60% of its tunneling tasks, with expectations to achieve precise underwater alignment by the end of the year [18].

Core Insights - The recent initiative on Douyin showcasing China's heavy machinery has garnered significant attention, with over 4 billion views and 60 million likes in just one month, highlighting the public's interest in the country's industrial capabilities [1][12] - The collaboration between Douyin and the China Listed Companies Association has allowed creators to explore and present advanced industrial projects, bridging the gap between technical expertise and public understanding [1][12] Group 1: Heavy Machinery and Infrastructure - The Ningbo-Zhoushan Railway's underwater tunnel, featuring the "Yongzhou" shield machine, operates at a depth of 58 meters and can withstand water pressure of up to 8.48 MPa, showcasing China's advancements in construction technology [2] - The construction of the intelligent irrigation system in Yunnan has transformed previously unproductive farmland, increasing irrigation efficiency from 40% to 90% and reducing costs significantly [3] - The Qinshan Nuclear Power Station is now producing medical isotopes domestically, marking a significant step in reducing reliance on foreign technology [4] Group 2: Renewable Energy and Aerospace - China's wind power capacity has reached 520 million kilowatts, maintaining its position as the world's leader for 14 consecutive years, with significant advancements in turbine technology [4] - The Zhuque-3 rocket, China's first recoverable orbital rocket, has been documented extensively, showcasing the country's progress in aerospace technology [6] - The C919 aircraft, a product of domestic innovation, features improved fuel efficiency and advanced monitoring systems, significantly reducing operational costs for airlines [6] Group 3: Communication and Public Engagement - Creators have effectively translated complex technical concepts into relatable narratives, enhancing public understanding of advanced technologies [7][8] - The emotional connection established by creators through personal stories and relatable analogies has increased audience engagement, with videos on Douyin achieving high viewership and interaction rates [8][11] - The initiative has highlighted the dedication of engineers and workers behind these projects, emphasizing their contributions to China's technological advancements [9][10][11]

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 Viewpoint - The article highlights the emergence of Douyin creators as key figures in bridging the gap between advanced technology and public understanding, showcasing China's major engineering projects and innovations through immersive storytelling and relatable content [5][10][20]. Group 1: Douyin Creators and Their Impact - Douyin creators are gaining access to previously restricted engineering sites, allowing them to document and share the stories behind China's major infrastructure projects, such as the world's longest underwater high-speed rail tunnel [5][10]. - The creators utilize a first-person narrative style to make complex engineering concepts relatable, transforming abstract ideas into tangible stories that resonate with the audience [10][12]. - The content produced by these creators has garnered significant engagement, with videos on topics like the underwater tunnel and wind energy achieving millions of views and likes, indicating a strong public interest in these subjects [23]. Group 2: Technological and Engineering Highlights - The article discusses various engineering feats, including the construction of the underwater tunnel and the development of China's first reusable commercial rocket, emphasizing the technical challenges and innovations involved [7][9]. - Creators explain complex technologies in simple terms, such as comparing wind energy generation to a "super-sized electric fan," making it easier for the public to grasp the significance of these advancements [12][16]. - The narrative also includes personal stories from engineers and workers, highlighting their dedication and the human element behind these technological achievements, which fosters a sense of national pride [18][20]. Group 3: Platform Support and Community Engagement - Douyin has launched initiatives like "Burning Up! Major National Equipment" to support creators in showcasing China's technological innovations, providing them with resources and access to critical sites [21][23]. - The platform's support has led to a significant increase in the visibility of these creators' content, with over 36.7 billion views on related topics, demonstrating the effectiveness of this approach in engaging the public [23]. - The creators' work not only informs but also inspires viewers, enhancing national confidence and encouraging interest in science and technology among younger audiences [23][25].

Core Insights - The construction of the world's longest underwater high-speed rail tunnel has achieved a significant milestone with the "Dinghai" shield machine surpassing 5,000 meters of excavation, marking approximately 80% completion of the Zhoushan side of the tunnel, which is 6,270 meters long [1][3] Group 1: Project Overview - The Jintang Underwater Tunnel is a key project of the Ningbo-Zhoushan Railway, spanning 16.18 kilometers, with the shield section measuring 11.21 kilometers [3] - Two large-diameter shield machines, "Dinghai" and "Yongzhou," are being used for excavation from both sides, facing complex geological conditions including high water pressure and various soil types [3] Group 2: Construction Challenges - The geological conditions are extremely complex, requiring the shield section to navigate through hard rock, clay, and sandy layers, presenting multiple challenges such as high intensity, high water pressure, and high precision [3] - The construction team has implemented measures such as enhanced tail seal management, optimized excavation parameters, and real-time monitoring to control ground disturbance and ensure safety [3] Group 3: Future Plans - The "Dinghai" shield machine is set to continue its progress towards the seabed connection point, with the "Yongzhou" shield machine also advancing steadily [5] - The project is expected to achieve a successful underwater connection by October 2026, with the Ningbo-Zhoushan Railway projected to be operational by 2028, integrating Zhoushan into the national railway network [5]

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].

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]