bertha, the giant tunnel-boring machine

tunnel boring machine drill -

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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Seattle Tunnel Boring Machine -- Bertha Rescue

Why Seattle's Huge Tunnel-Boring Machine Is Still Stuck A year after Bertha got stuck, plans to free the big machine have stalled. And there's another problem.

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NPI's Cascadia Advocate

Offering daily news and analysis from the majestic Evergreen State and beyond, The Advocate is the Northwest Progressive Institute's unconventional perspective on world, national, and local politics.

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Watch Bertha, the world's largest tunnel boring machine

Watch Bertha, the world's largest tunnel boring machine, emerge from beneath Seattle by Kurt Schlosser on April 4, 2017 at 10:01 am April 4, 2017 at 4:42 pm Comments 15 Share 20 Tweet Share ...

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Bertha, The Giant Tunnel-boring Machine - Video Results

More Bertha, The Giant Tunnel-boring Machine videos

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The end is near for Bertha: After nearly 2 miles in 4

Bertha has made it to the finish line. The celebrity boring machine’s arrival near Seattle Center, some 29 months late, guarantees a Highway 99 tunnel bypassing downtown.

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Seattle's Giant Drill, 'Bertha,' Is Stuck - Newser

A giant drill boring beneath a section of Washington's State Route 99 has ground to a halt after hitting a mysterious clog some 60 feet underground. ... "Bertha," the massive tunnel boring machine ...

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seattle 039 s giant tunneling machine -

Bertha (tunnel boring machine) - Wikipedia. Bertha was a 57-foot-diameter (17.4 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle.

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Bertha breaks through: World's largest boring machine

The normally sedate city of Seattle sounded more like the set of a science fiction epic today as the world's largest boring machine roared and screeched its way into the open air. The tunnel boring machine, better known as "Bertha" cut through a wall of r

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How did we get here? A look back on Seattle’s tunnel

Bertha’s end could be near. The world’s largest tunnel-boring machine is on schedule to break into daylight this spring after a tumultuous dig under downtown Seattle that’s years behind ...

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