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The sled that the boring machine will pull behind it through the newly ringed tunnel segments will be longer than a football field. Crews estimate that the boring could begin as soon as August, once the various power and hydraulic connections are made between the machine and its equipment sled.

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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.They may also be used for microtunneling.

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Tunnel boring machine - Wikipedia. Micro tunnel shield method is a digging technique used to construct small tunnels, and diminish in size of general tunnelling shield.

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Micro tunnel boring machine is quite similar to general Tunnelling shield but on a smaller scale. These Tunnel boring machine generally vary from 1 to 1.5 metres ... These Tunnel boring machine generally vary from 1 to 1.5 metres ...

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A tunnel boring machine (TBM) consists of a shield (a large metal cylinder) and trailing support mechanisms. A rotating cutting wheel is located at the front end of the shield.

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The machine used to create this tunnel is known as a Tunnel Boring Machine, and consists of a cutterhead, scrapers, a giant screw and a conveyor belt. Lady Bird is 442 feet long (more than a football field in length, according to DC Water), weighs 1,325 tons, and can move at a speed of 4 inches per minute.

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