CRCHI(SH:688425) Yang Shi Wang·2025-10-26 00:50Core Viewpoint - The article emphasizes the importance of developing advanced technologies and "national heavy equipment" during the "14th Five-Year Plan" period, highlighting significant achievements in China's engineering capabilities, particularly in the field of shield tunneling machines [1][20]. Group 1: Technological Advancements - The "Jiang Hai" shield tunneling machine, with a maximum excavation diameter of 16.64 meters, is custom-built for the Hai Tai Yangtze River Tunnel project, which is a key national infrastructure initiative [5][11]. - The Hai Tai Yangtze River Tunnel will significantly reduce travel time across the river from one hour to ten minutes, showcasing the efficiency of modern engineering [5]. - The "Jiang Hai" machine incorporates advanced technologies such as a real-time monitoring system and intelligent assembly robots, making it a highly automated and digitalized piece of equipment [16][20]. Group 2: Engineering Challenges - The "Jiang Hai" machine faces significant challenges, including high water pressure and deep excavation, requiring innovative solutions like the development of a constant pressure tool replacement technology [15][14]. - The machine's main bearing, considered its "heart," is designed for a lifespan of over 20,000 hours, reflecting the rigorous engineering standards required for such a project [14][12]. - The construction process demands precise control of ground disturbance, with tolerances maintained at the millimeter level to avoid damaging the surrounding soil [15]. Group 3: Industry Growth and Market Position - China's shield tunneling machine industry has achieved a global market share of 70%, with products exported to over 40 countries and regions [20]. - The period of the "14th Five-Year Plan" has seen rapid growth in the number and technological sophistication of ultra-large diameter shield machines, indicating a shift from reliance on foreign technology to domestic innovation [22][20]. - The industry is expanding its application scenarios beyond traditional uses, venturing into energy channels and complex tunneling directions, demonstrating the versatility and advancement of Chinese engineering [23][22].