Group 1 - The "Longgang No. 3" shield tunneling machine, developed by China Railway Equipment Group and China Railway Shanghai Engineering Group, is the largest diameter earth pressure/TBM dual-mode shield machine in China, marking the full entry into the large shield construction phase of the Deep-Shan Railway project [1][3] - The Deep-Shan Railway, a key transportation project in the Guangdong-Hong Kong-Macao Greater Bay Area, spans 125.5 kilometers with six stations and 18 double-line tunnels, enhancing connectivity between Shenzhen and the Deep-Shan Special Cooperation Zone [3][4] - "Longgang No. 3" features a diameter of 14.29 meters, a total length of 125 meters, and a weight of approximately 4,250 tons, equipped with advanced systems for geological forecasting and monitoring, enabling safe and efficient tunneling through complex geological conditions [3] Group 2 - The completion of the Deep-Shan Railway project is expected to significantly promote the integration of the Deep-Shan Special Cooperation Zone with Shenzhen, facilitating deeper involvement in the development of the Guangdong-Hong Kong-Macao Greater Bay Area [4] - The project will strengthen connections between the Guangdong-Hong Kong-Macao region and the coastal areas, optimize external railway channels from Shenzhen, and accelerate the construction of the Deep-Shan Special Cooperation Zone [4]

Core Insights - The article highlights the achievements of Chen Jian, a senior engineer at China Railway 14th Bureau, who has made significant contributions to the development of large-diameter shield tunneling technology in China [1][4][14] Group 1: Achievements and Innovations - Chen Jian has been instrumental in overcoming world-class challenges in shield tunneling, particularly during the construction of the Nanjing Yangtze River Tunnel, which faced issues such as high water pressure and complex geological conditions [5][7] - The team led by Chen developed innovative solutions, including a world-first technology for switching cutter heads under normal pressure, which has been successfully applied in international projects [7][8] - Chen's research and innovations have resulted in direct economic benefits of 2.016 billion yuan and additional revenue of 38 billion yuan for the company [7] Group 2: Team Development and Industry Impact - Under Chen's leadership, a specialized team of 1,900 members has been established, mastering ten core technologies and completing complex geological tasks across various projects [13] - The company has been involved in major infrastructure projects across China, including the "First Tunnel Under the Yellow River," addressing extreme geological conditions [8][14] - Chen emphasizes the importance of lifelong learning and technological innovation to drive industry development, aiming to tackle future challenges in shield tunneling [14]

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]

Core Points - The Jinan Aerospace Avenue Yellow River Tunnel project has officially entered the shield tunneling construction phase with the launch of the "Qihang" shield machine [1][3] - The tunnel, measuring 3,888 meters in length, is designed as a dual six-lane urban arterial road with a speed limit of 60 km/h, connecting the Yaoqiang International Airport and the new kinetic energy conversion pilot area [3][5] - The construction faces significant geological challenges, including complex soil conditions and a high water table, necessitating strict control over ground settlement during tunneling [3][5] Project Details - The shield section of the tunnel, managed by China Railway 14th Bureau, spans 3,252 meters and utilizes a 15-meter diameter earth pressure balance shield machine [3] - The geological conditions include a mix of silty clay, clay, fine sand, and silt, with a significant presence of calcium nodules, complicating the tunneling process [3][5] - The "Qihang" shield machine has a cutting area of 178 square meters, generating 800 cubic meters of waste slurry per ring, which poses challenges for waste management [5] Innovations and Solutions - The project team has customized the "Qihang" shield machine to address the challenging geological conditions, implementing technical innovations to enhance tunneling efficiency [5] - Measures include increasing the opening rate of the cutter head, reducing fixed scrapers, and adding pre-cutting and concrete cutting tools to improve waste discharge [5] - Waste slurry treatment capabilities have been enhanced through the installation of advanced equipment, including two-stage screening and plate filter presses [5] Impact and Significance - Upon completion, the tunnel will significantly reduce travel time between Jinan Airport and the core area of Cuizhai from 30 minutes to 10 minutes, facilitating better connectivity for vehicles and logistics across the Yellow River [5] - The project is a key initiative in response to the national strategy for the new kinetic energy conversion comprehensive pilot zone, enhancing the urban road network and improving connections to major highways and transport hubs [5]

Group 1 - The "Linghao" shield machine, the world's largest diameter high-speed rail shield machine, has set a world record by achieving a monthly excavation of 718 meters [1] - The National Key Laboratory for Tunnel Boring Machines and Intelligent Operation and Maintenance, established by China Railway Tunnel Bureau, China Railway Engineering Equipment Group, and Zhengzhou University, is the only national public research platform in the field of tunnel boring machines [1] - The laboratory focuses on research in three main areas: efficient rock breaking and field change control, extreme working condition equipment design and manufacturing, and intelligent excavation and operation and maintenance [1] Group 2 - China is the world's largest country in terms of the number of tunnels, construction scale, and development speed [2] - The team has developed the industry's first shield TBM engineering big data platform, laying the foundation for the transformation of intelligent construction in shield TBM tunnels [2] - The intelligent construction system integrates nine major technologies, significantly enhancing engineering efficiency and quality, representing cutting-edge technology in China's high-speed rail tunnel construction [2] Group 3 - The research team consists of 47 members, with 33 under the age of 35, emphasizing the role of young talents in technological innovation [3] - The laboratory has established youth strike teams focused on intelligent excavation and geological disaster perception and prevention in TBM tunnels [3] - The team aims to contribute to high-quality development in tunnel intelligent construction through technological innovation, aligning with national goals for technological self-reliance [3]

Core Insights - The construction of major engineering projects continues during the "May Day" holiday, with significant progress being made in various regions [1] Group 1: Jiangsu - Haitai Yangtze River Tunnel - The Haitai Yangtze River Tunnel, spanning 11.185 kilometers, is the longest underwater road tunnel in the world, currently progressing with a shield tunneling machine named "Jianghai" [1][2] - As of now, the "Jianghai" shield machine has advanced 200 meters at a rate of 10 meters per day, utilizing advanced technology for efficient operation [1][2] - The tunnel features a unique rescue vehicle passage for emergency situations, designed to enhance safety and efficiency, with an expected completion date in 2028 [2] Group 2: Jiangxi - Changjiang Navigation Channel Improvement Project - The Changjiang Navigation Channel improvement project in Jiangxi is actively progressing, with over a hundred workers on-site during the holiday [3] - The project, which started in October 2024 and is expected to be completed by the end of 2028, aims to enhance the annual cargo throughput capacity to 15 million tons [3][4] - Innovative management and technology have led to significant cost savings of over 100 million yuan and a three-month reduction in the project timeline [4][5] Group 3: Safety and Technological Innovations - The Changjiang Navigation Channel project employs advanced monitoring systems, including 22 4K cameras, to ensure safety and effective risk management [4][5] - The integration of smart management and technological innovations is transforming construction practices, enhancing efficiency and safety [5]

记者从中国水利水电第四工程局有限公司了解到，4月27日，青海第一长隧——互助北山特长隧道全线 贯通。互助北山特长隧道位于青海省海东市互助土族自治县，起点始于元甫沟，终点至柏木峡口。隧道 全长11.15千米，左、右线隧道长度分别为11177米和11126米，是青海加西公路控制性工程，也是青海 省目前最长的隧道。（央视） ...

Core Points - The Beijing East Sixth Ring Road renovation project has been completed and opened to traffic after five years of construction, allowing vehicles to traverse the urban sub-center through an underground tunnel [1][2] - The project is a key initiative for Beijing, spanning approximately 16.3 kilometers, with a 7.4-kilometer shield tunnel being a critical component [1] - The tunnel is the deepest in Beijing at 75 meters and one of the longest shield highway tunnels in China, overcoming significant construction challenges [1][2] Construction Challenges - The construction team developed two large-diameter shield machines, "Jinghua" and "Yunhe," to tackle technical difficulties such as shallow cover starting and high-risk hoisting [2] - The project utilized self-developed synchronous double-liquid grouting technology to control ground settlement to millimeter-level precision, filling a gap in China's large-diameter slurry shield tunnel technology [2] - Intelligent ventilation technology was implemented to monitor various data in real-time, improving air quality within the tunnel and achieving over 80% purification efficiency [2] Significance - The East Sixth Ring Road serves as a vital link connecting key areas such as Shunyi, Daxing, Yizhuang, and both Beijing Capital International Airport and Beijing Daxing International Airport [2] - The completion of the project is expected to enhance traffic coordination in the Beijing-Tianjin-Hebei region and improve the overall transportation service level in Beijing [2]