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]