Group 1 - The "Chuan Shan Jia No. 1" shield machine, the first fully "Sichuan-made" shield machine, has successfully rolled off the production line in Chengdu, designed for extreme low-temperature conditions and will be exported to Europe [1] - The shield machine features a diameter of 3.72 meters, a length of 135 meters, a weight of 350 tons, and a maximum excavation speed of 80 millimeters per minute, specifically designed for construction in permafrost layers [1] - The machine's cutter head uses a 15.5-inch rolling cutter with a design that prevents mud cake formation, ensuring efficient excavation in extreme cold [1] Group 2 - China Railway High-tech Intelligent Equipment Co., Ltd. was established in September 2023, aiming to create the first intelligent assembly line for full-section tunnel boring machines in Southwest China, with an initial investment of 1 billion yuan [2] - The manufacturing base is expected to produce 14 shield machines, 50 sets of tunnel construction equipment, and 50,000 tons of steel structures annually, generating an estimated annual output value of 1.8 billion yuan and creating over 1,000 jobs [2] - The company plans to expand its overseas market for "Sichuan-made" shield machines while providing key technical support for tunnel construction in regions such as western Sichuan, Tibet, and Northeast China [2]

Core Viewpoint - China Railway has successfully launched the first high-end equipment shield machine, "Chuan Shan Jia No. 1," designed for extreme cold conditions, marking a significant advancement in domestic manufacturing capabilities for tunnel construction equipment [2][3] Group 1: Product Features - The "Chuan Shan Jia No. 1" shield machine has a diameter of 3.72 meters and a length of approximately 135 meters, specifically designed to operate in permafrost conditions at temperatures as low as -40 degrees Celsius [2] - The machine features a 15.5-inch rolling cutter and a design that prevents mud cake formation while ensuring efficient excavation [2] - It incorporates low-temperature resistant materials and components, along with specialized heating equipment to maintain stable operation in extreme cold [2] Group 2: Technological Advancements - The shield machine has achieved breakthroughs in key technology areas, establishing a fully domestic supply chain covering control systems, monitoring, and construction equipment [3] - The independently developed main bearing, considered the "heart" of the shield machine, has surpassed the performance of imported bearings and is priced at only 60% of the import cost, with a manufacturing lead time of just one-fourth [3] Group 3: Manufacturing and Economic Impact - The China Railway Intelligent Equipment Manufacturing Base aims to become the first intelligent assembly line for full-face tunnel boring machines in the Southwest region, targeting an annual production of 14 shield machines and 50 sets of tunnel construction equipment [3] - The expected annual output value of the base is projected to reach 1.8 billion yuan, creating over a thousand jobs [3]