Mei Ri Jing Ji Xin Wen·2025-07-24 10:45Core 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]