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Tunnel boring machine - Wikipedia. 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.They may also be used for microtunneling.

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Bertha (tunnel boring machine)

Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and is the world's largest earth pressure balance tunnel boring machine, at a cutterhead diameter of 57.5 feet (17.5 m) across.

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micro-tunnelling: Metro boring: Steel beams to be removed

The steel beams are remnants of the north-south Metro construction in the early 1980s. Once they are out of the way, the twin tunnel boring machines (TBMs) will begin burrowing in January.

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Tunnel boring machine - Wikipedia. A tunnel boring machine ... Tunnel boring machines are used as an alternative to drilling and blasting (D&B) methods in rock and conventional "hand mining" in soil.

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Elon Musk's Boring Company drops plans to dig under LA's

FLAMETHROWER, SPACE, ELECTRIC CAR, and supposed marijuana enthusiast Elon Musk's Boring Company has decided to abandon its plans to dig a tunnel …

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