Core Points - The Wuhan Metro Line 12 has reached a critical milestone with the successful launch of the right-line tunnel boring machine, entering the dual-line synchronous excavation phase between Hangang Station and Hanxi Road South Station [1][3] - Once completed, the metro will allow passengers to cross the Han River in approximately 2 minutes, enhancing the efficiency of cross-river transportation in Wuhan [1] Construction Details - The tunnel section is a key control project, constructed by China Railway's subsidiary, China Railway Construction Investment, with China Railway First Group as the contractor [3] - The left tunnel is 1,372 meters long, and the right tunnel is 1,379 meters long, requiring the boring machine to operate approximately 30 meters underground through a clay layer and under 10 significant structures, including the Han River and Metro Line 1 [3] - To minimize ground disturbance during the dual-line excavation, a staggered launch plan was implemented, with the left line starting on October 20 and the right line on October 31 [3] Geological Challenges - The construction site presents complex geological conditions, including thick mud layers, loose sand layers, hard bedrock, and fractured zones, particularly under the Han River [3] - The underwater segment of the tunnel spans 347 meters, accounting for over 25% of the total length, with challenges such as a maximum cover depth of 41.2 meters and a maximum water pressure of 0.4 MPa [3] Safety and Quality Control - The construction team employs real-time monitoring of river surface dynamics, optimized boring tools, and a composite reinforcement technique to ensure safety and precision during excavation [3][4] - The project manager, a young professional with ten years of experience, emphasizes a "five no" quality standard: no pollution, no misalignment, no damage, no leakage, and no exceedance, which is integrated throughout the construction process [4][5]

Core Points - The Wuhan Metro Line 12 is the city's first circular metro line, connecting seven central urban areas and enhancing urban transportation and resource flow [1] - As of now, 33 out of 37 stations have completed their main structures, with ongoing renovations and installations [1] - The project emphasizes the integration of party leadership and engineering excellence, showcasing a model of "Party Building + Engineering Construction" [1][7] Construction Techniques - The construction of the Line 12 section between Hoh Lake Fourth Road and Xingye Road achieved "zero settlement," indicating minimal impact on existing metro lines [2] - Advanced monitoring techniques are employed, with automated monitoring every three minutes to control tunnel settlement and ensure safety [3] - Technologies such as ultrasonic testing and seepage monitoring are utilized to maintain the integrity of underground structures [3][4] Quality Control and Standardization - A comprehensive quality control manual for the electrical and mechanical systems has been developed to ensure material and process standardization [6] - The project team has created a "pocket book" and training videos to facilitate understanding of quality standards among construction personnel [6] - The complexity of urban metro construction necessitates a multidisciplinary approach, requiring personnel to be proficient across various fields [6] Organizational Commitment - The Wuhan Metro Company emphasizes the integration of party work with operational goals, aiming to enhance the city's transportation capabilities [7] - The project is seen as a significant contributor to the high-quality development of Wuhan's urban transit system [7]