重庆轨道交通7号线一期工程建设取得新进展

Core Viewpoint - The successful completion of the TBM breakthrough for the Chongqing Rail Transit Line 7 Phase I project marks a significant milestone in the construction of a vital north-south transportation artery in western Chongqing, enhancing connectivity among various urban clusters [1][2]. Group 1: Project Overview - The Chongqing Rail Transit Line 7 Phase I project spans approximately 28 kilometers with 18 stations, connecting key areas such as Xiyong, Hangu, and Jinfeng [1]. - The recently completed section measures 2,340.669 meters, with the TBM segment accounting for 1,727.363 meters, navigating through complex geological conditions including high-strength sandstone and mudstone [1]. Group 2: Technical Innovations - The project team implemented innovative technologies to address the challenges of tunneling through long-distance, high-strength rock layers, utilizing a proprietary wear-resistant coating with a shear strength exceeding 350 MPa, significantly enhancing tool durability [2]. - The team achieved a remarkable feat of continuous tunneling through hard rock without the need for opening storage or changing tools, ensuring a smooth construction process [2]. Group 3: Safety Measures - To mitigate the risk of segment uplift in hard rock layers, the project team meticulously controlled tunneling parameters and optimized grouting processes, resulting in high-quality tunnel lining with no significant misalignment or damage [2]. - A specially developed track surface treatment device was created to enhance traction on steep gradients, effectively addressing safety concerns during transportation within the tunnel [2].