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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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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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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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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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The World's Largest Tunnel-Boring Machine. ... the world's largest-diameter tunnel-boring machine. ... Bertha is digging the 1.7-mile tunnel by advancing at an ...
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The World's Largest Tunnel-Boring Machine Must Be Saved. Bertha has stalled deep beneath Seattle, ... What do you do when the world's largest tunneling machine is, ...
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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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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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reddit: the front page of the internet ... Worlds Largest Tunneling Machine, works. Bertha is currently being blocked by an "object" in Seattle, WA. (youtube.com)
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Follow Bertha Thank you for following Bertha. The SR 99 tunneling machine, nicknamed Bertha, has completed her work. For the latest tunnel progress, visit our new tracker page.
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Bertha, the world's largest tunnel-boring machine, ends its journey today. It has spent four years traveling less than two miles to build a new car tunnel underneath Seattle.
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We've covered the saga of the SR99 tunneling machine, better known as Bertha, since it broke down after only drilling though just 52 feet in three days of operation. Now the Seattle tunnel boring machine is finally back on track. It just broken through an access repair tunnel and has since mined 73 ...
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The World's Largest Tunneling Machine The 7,000-ton machine, named after Seattle's first female mayor, is ... Pieces of the Bertha tunneling machine, ...
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The tunneling machine known as Bertha began tunneling beneath Seattle in July 2013 (photo at right: ...
Get A Free Quoteworld's largest tunnel-boring machine . ... The last piece of Bertha, the world's largest tunneling machine, has been removed from Seattle's SR 99 tunnel, ...
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Bertha, the world's largest tunneling machine, churning through the rock and mud beneath Seattle, has hit a mysterious roadblock—so mysterious, it is only known for now as "the object."
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Meet Bertha: Bertha is the world's largest tunnel boring machine. She weighs 7,000 tons and, at 17.5 metres tall, is roughly the height of a three storey house.
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Feb 28, 2014 · Sand Grinds World's Largest Tunneling Machine To A Halt Bertha, ... Here's what is blocking Bertha, the world's largest tunneling ...
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Manufacturing & Engineering Hitachi Zosen Corporation. ... The world's largest shield tunneling machine was officially named Bertha on December 20, ... Bertha, the ...
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SEATTLE — The world's largest tunnel-boring machine broke through a concrete wall beneath Seattle on Tuesday to reach the end of its long, troubled...
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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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The world's largest tunnel drill spent Tuesday morning kicking up dust ... Bertha's breakthrough just 'halftime' for tunnel ... Tunnel machine Bertha breaks ...
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Bertha, the world's biggest tunnel-boring machine currently underneath Seattle, has been stuck for nearly one month. Now, crews are close to figuring out what exactly is stopping her.
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bertha world's largest tunnel-boring machine. We are the manufacturer of coal mining machine,roadheader,coal loader,tunnel mucking loader,backfilling machine,concerte pumping machine and so on. bertha world's largest tunnel-boring machine manufacturer, supplier.
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