Tunnel boring machines have been in operation for over 200 years and they operate on the same ... Due to the fact that neither the skin nor the cutter head can be removed from a tunnel ...

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.

Los Angeles was using “Rachel” a tunnel boring machine built by Herrenknecht of Germany to drill seven miles from a Carson ...

The tunnel boring machine known as Chessie got back to work on April ... The machine has a steel cutter head 43 feet in diameter and about 300 feet long — the length of a football field minus ...

China's largest tunnel boring machine (TBM) 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 ...

The study of disc cutter wear in tunnel boring machines (TBMs) is fundamental to optimising both the economic and operational performance of subterranean construction projects. Disc cutter wear ...

Nicknamed "Chessie," the tunnel boring machine broke through the receiving pit on Two Island at Thimble Shoal ... It was roughly 10 feet in length and caused damage to the machine cutter head.