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Tunnel boring machine - Wikipedia

A tunnel boring machine (TBM), ... maintenance and repair need to be medically cleared as "fit to dive" and trained in the operation of the locks. ...

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The DEP commences the largest repair project in the history of the New York City ... One of the world's most advanced tunnel- boring machines will build the bypass ...

Bertha (tunnel boring machine) - Wikipedia

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.

Hard grind: The epic journey of the world's biggest tunnel ...

On April 4, the world's largest tunnel boring machine broke through to the open air after almost four years underground. Called Bertha, the giant digger was tasked with the challenge of building a tunnel large enough to carry four lanes of motor traffic under the heart of Seattle.

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EXCLUSIVE: Bertha repair company offers first look into how ...

Jul 09, 2015 · Bertha's 24 gearboxes and motors are OK, and the giant tunnel machine's rebuilt drive gears will be delivered to the drilling site by early August. This update on Seattle's stalled tunnel boring machine came Friday from Roland Ramberg, CEO of The Gear Works, a large gearbox building and repair ...

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Manual transmission - Wikipedia. A manual transmission, also known as a manual gearbox, or colloquially in some countries (e.g. the United States) as a stick shift is a type of transmission used in motor vehicle applications.

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Another Seattle tunnel drill (not Bertha) damaged, needs repair

Bertha isn't the only tunnel machine to crack in Seattle soil. Drilling at Sound Transit stopped for six weeks when hard soil damaged five motors and the main gear, officials reported Thursday.

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Guided Boring Machine (GBM) | Microtunneling (MTBM) ... Akkerman systems are available for purchase, lease-to-purchase, or rent from our rental fleet. PRODUCTS.

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