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bertha world's largest tunneling machine

Bertha's on her way | Bertha, the world’s largest tunneling

Bertha, the world’s largest tunneling machine, officially started the 2-mile journey beneath downtown on July 30, 2013. Bertha will push forward slowly at first, digging about 6 feet per day.

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water boring machine – Grinding Mill China. water boring machine ... The world& 39;s largest tunnel-boring machine, nicknamed Bertha, has been stuck beneath Seattle for over a year amid its efforts to build a ...

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The World's 25 Most Impressive Megaprojects. The World's 25 Most Impressive Megaprojects. The biggest and boldest projects on the planet.

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The World's Largest Tunneling Machine Is (Finally) Getting

Bertha, the world’s largest tunneling machine, has been stuck under downtown Seattle since it broke in December 2013. Engineers have had to concoct a massive and expensive rescue plan—essentially a whole construction project in itself.

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Watch Bertha, the world’s largest tunnel boring machine

From the dark depths beneath Seattle, Bertha the SR 99 tunnel machine headed out of the muck and into daylight on Tuesday, completing a final push in a years-long effort to create space for a new highway beneath the city.

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The World's Largest Tunneling Machine Is … Bertha, the world's largest tunneling machine, has been stuck under downtown Seattle since it broke in December 2013.

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Jun 25, 2017 · Bertha, the world's largest tunneling machine, officially started the 2-mile journey beneath downtown on July 30, 2013. Bertha will push forward slowly at ...

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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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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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world amp 39 s largest tunneling machine. Sand Grinds World's Largest Tunneling Machine To A Halt. Bertha, which got stuck digging a Seattle highway tunnel, is 60 feet below ground and can't move forward — or backward.

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