[The domestically produced largest diameter hard rock TBM is offline] On April 3, 2026, the domestically developed maximum diameter 13.2-meter hard rock TBM by CCCC Tianhe started construction in Changshu. The machine is equipped with 7600 domestically produced rare earth special steel main bearings developed by the Institute of Metals, Chinese Academy of Sciences, with a rated life of over 15000 hours and performance exceeding imports. This move marks China Communications Construction Corporation's first achievement of 100% localization of core components for ultra large diameter tunneling machines, completely bridging the last mile of national production of major underground engineering equipment in China.Editor/Cheng Liting

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