Core Points - The Shanghai Metro Line 22 (Chongming Line) has achieved a significant milestone with the completion of the tunnel for the entire line, marking the longest subway tunnel crossing the Yangtze River in China [1][3] - The completed upward tunnel spans approximately 2,724 meters and faced geological and environmental challenges during construction [1] - The project team implemented advanced techniques to ensure safety and stability during the construction process, including a composite reinforcement method to manage complex water-bearing strata [3] Summary by Sections - **Construction Progress** - The entire tunnel for the Chongming Line has been successfully completed, facilitating subsequent construction phases such as track laying, electromechanical installation, and station decoration [3] - All eight stations of the Chongming Line have completed their main structural caps, and 28 tunnels have been fully connected [3] - **Technical Challenges and Solutions** - The construction faced significant challenges due to high groundwater levels and thick sandy layers, necessitating strict control over ground settlement during tunneling [1] - The project team utilized a combination of "stirring piles + jet grouting + horizontal freezing" techniques to create a reliable frozen curtain, effectively isolating groundwater and ensuring the safe reception of the shield machine [3] - **Impact on Transportation Network** - The completion of the Chongming Line will enhance the integrated transportation network in the Yangtze River Delta, providing more convenient travel options for residents [3]

Core Points - The completion of the last slab pouring at the terminal station of Shanghai Metro Line 22 (Chongming Line) signifies the structural topping of all stations along the line [1] - The Chongming Line spans approximately 43 kilometers and includes 8 stations, marking it as Shanghai's first metro line crossing the Yangtze River [1] - The construction of the line overcame significant challenges such as long underwater tunnel excavation, high water pressure at the riverbed, and complex geological conditions [1] - Once operational, the line is expected to enhance the connectivity between Chongming, a world-class ecological island, and the Yangtze River Delta urban agglomeration, providing strong momentum for regional development [1]

Core Points - The Shanghai Metro Line 22 (Chongming Line) has completed the final concrete pouring for the last station roof at Yuyuan Station, marking the completion of the main structure for all stations along the line [2] Group 1 - The completion of the last station roof signifies that the main structure of the entire Chongming Line has been capped [2]

Core Insights - The article highlights the construction of Shanghai's first subway line that crosses the Yangtze River, known as the Chongming Line, which is a significant development for urban transportation in Shanghai [1][4]. Group 1: Project Overview - The Chongming Line, officially designated as Shanghai Metro Line 22, spans 42.3 kilometers with approximately 83.9 kilometers of track laying planned [1]. - The project has overcome challenges such as long-distance tunneling, high water pressure, and complex geological conditions, with a major breakthrough expected on March 13, 2025, when the tunnel will be fully connected [1][4]. Group 2: Construction Details - The construction employs high-speed rail precast track slabs and precision measurement technology to enhance train stability and passenger comfort [2]. - Environmentally friendly, low-noise new energy equipment is utilized in the construction process [2]. Group 3: Technological Integration - A digital management system is in place at the Chongming Line's smart center, integrating data on safety, quality, progress, personnel, and transportation for comprehensive project oversight [4]. Group 4: Economic and Urban Impact - The Chongming Line will connect key areas including Shanghai Pudong, Changxing Island, and Chongming Island, promoting economic development in these regions [4]. - The ongoing expansion of Shanghai's metro system aims to enhance urban connectivity and support the city's development strategy, with a total operational mileage of 896 kilometers [4][5].