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TUNNEL BORING MACHINE Tunnel Boring Machine The tunnel will be excavated by a tunnel boring machine (TBM) to a diameter of 12-1/2 feet. The TBM was assembled at the base of the access Shaft in a short

The World's Largest Tunnel-Boring Machine Must Be Saved

What do you do if you're operating the world's biggest tunneling machine and something goes wrong? You're digging along, everything fine, the machine's five-story maw about to chew beneath the skyscrapers of one of the great American cities. Then suddenly one day things are not so fine. Bertha ...

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A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.

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How much does a tunnel boring machine cost? - Quora

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Gizmag goes inside the world's largest tunnel boring machine

On Saturday,the world's largest tunnel boring machine was dedicated in the city of Seattle. "Bertha," as it's known, will spend the next 14 months boring a 1.7 mile (2.7 km) tunnel under the city to replace a viaduct damaged in a 2001 earthquake.

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TBM Tunnel Boring Machine - Cutting Head

Performance characteristics of tunnel boring machine in basalt and ... A 12.24 km long tunnel between Maroshi and Ruparel College is being excavated by tunnel boring machine (TBM) to improve the water supply system of Greater Mumbai, India.