worlds largest tunneling machine under earth

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    The "Big" in Bertha's name isn't there for the catchiness. It's there because it's apt. With a 57-foot diameter and a length of a football field, Big Bertha is the world's largest tunnel-boring machine.

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  • The World's Largest Tunnel-Boring Machine | Popular Science

    The World's Largest Tunnel-Boring Machine. Meet the 25,000-horsepower Bertha. ... In July, they unleashed Bertha, the world's largest-diameter tunnel-boring machine.

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  • The World's Largest Tunnel Boring Machine - GeoPrac.net

    Perhaps you've heard of Bertha, the World's Largest Tunnel Boring Machine or TBM? She's currently working her way underneath Downtown Seattle, excavating the Alaska Way Bored Tunnel to replace the aging Alaska Way Viaduct.

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    Contractors working for the state of Washington are planning a high-stakes operation to rescue Bertha — the world's largest tunneling machine. Bertha is supposed to be boring a 2-mile highway tunnel under downtown Seattle, but it got stuck in December. Bertha is on Seattle's waterfront, between ...

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    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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  • 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.

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    Under the city of Seattle, Bertha, the world's largest tunneling machine is at work excavating what will soon become the 1.7-mile long SR99 tunnel.

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