Here's how the tunnel boring machine, or TBM, works: As the 200-ton TBM moves forward, a round cutter head studded with titanium teeth grinds into the tunnel face and splits large chunks off the rock.
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China unveils 5,000 metric ton-heavy tunnel boring machine with largest-diameterChina has completed the production of its largest tunnel-boring machine ... The machine is 476 feet long and weighs about ...
China's largest shield tunneling machine cutter head, with a record-breaking diameter of 16.64 meters, descended at the construction site of the Haitai Yangtze River Tunnel in East China's Jiangsu ...
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