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there's no turning back Preventing equipment failures is crucial Once a tunnel boring machine begins its descent, its inability to backtrack becomes a big liability.

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The Robbins Company - Official Site

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Bertha was a 57-foot-diameter (17.4 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle.

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A tunnel boring machine (TBM), is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.Another use is to dig mountains for making road tunnels.

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Slewing Ring Bearings for Tunnel Boring Machines

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offers 551 tbm tunnel boring machine products. About 39% of these are construction machinery parts, 23% are pipe jacking machines, and 9% are tool parts.

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