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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. The machine is 326 feet (99 m) long and weighs ...

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Bertha | KNKX

Bertha is on the move. The broken-down tunnel machine began its journey toward an access pit where, if it makes it, workers will remove the front of the machine for repairs. It started moving on Tuesday night and had moved 3 feet by 7 a.m. on Wednesday. Bertha ...

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Seattle's Big Bertha Tunneling Machine Is Finally Back on Track

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

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. The story of how

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Seattle tunnel machine Bertha reaches halfway point — here's a rare look inside the massive project – GeekWire

The SR 99 tunneling machine has passed the halfway point on its long journey beneath Seattle, and officials stood 10 stories below street level on Monday to show off where Bertha is expected to punch through next spring. "This is the best hole in town," said Joe ...

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Tunnel boring machine - Wikipedia

A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and ...

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The World's Largest EPB Shield Tunneling Machine | Hitachi Zosen Corporation

Bertha, the TBM manufactured and supplied by Hitachi Zosen to Seattle Tunnel Partners (STP) for the use of the SR 99 - Alaskan Way Viaduct Replacement Project, has successfully completed boring of the tunnel. Our 17.45m diameter machine, one of the world ...

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SR 99 (@BerthaDigsSR99) | Twitter

The latest Tweets from SR 99 (@BerthaDigsSR99). Bertha completed her dig and now we're completing the work to replace the Alaskan Way Viaduct. WSDOT feed for ...

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Bertha - SR 99 Tunneling Machine | Flickr

These photos highlight the journey of Bertha, the tunneling machine that dug the State Route 99 tunnel beneath downtown Seattle. Visit for more information. Learn more about Bertha at her webpage or follow her on Twitter ...

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Tunnel Boring Machine "Bertha" Successfully Completed SR 99 Tunnel Project in Seattle | News Release | Hitachi Zosen Corporation

Osaka, Japan, May 19, 2017—Hitachi Zosen Corporation(TYO:7004) has announced that the Tunnel Boring Machine (TBM) known as "Bertha" has successfully completed mining for the SR 99 Alaskan Way Viaduct Replacement Project in Seattle. Breakthrough ...

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How did we get here? A look back on Seattle's tunnel machine Bertha | The Seattle Times

After launching in 2013, the world's largest tunnel-boring machine has less than 220 feet to go before finishing its 1.7-mile trip. Here's a look back on the tumultuous dig that's years ...

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bertha the tunneling machine - Roadheaders

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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World's biggest tunnel machine Bertha emerges from beneath Seattle - Autoblog

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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bertha tunneling machine - Roadheaders

KAMY is the worldwide leader in manufacturing hydraulic cutters, road headers, tunnel support systems, and other specialized machinery used in the tunneling, mining, and ... Alaskan Way Viaduct - Follow Bertha Bertha the tunneling machine broke through a new ...

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video of bertha tunneling machine - Roadheaders

Alaskan Way Viaduct - Follow Bertha 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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Bertha, Seattle's SR 99 Tunneling Machine, Is Finally Done Digging | WIRED

Bertha has broken through. After nearly four years underground, Seattle's beleaguered boring behemoth clawed its way into daylight yesterday, leaving a 1.7-mile tunnel behind it. And now that its job is done, workers can at last move an aging, potentially dangerous stretch of elevated highway

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Alaskan Way Viaduct - Home - Washington State Department of Transportation

street has been neatly squeezed in between the Alaskan Way Viaduct's concrete footings. ... the machine has been fully disassembled and crews have finished building the roadways and walls inside the tunnel. What happened to Bertha? The machine ...

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Under Seattle, a Big Object Blocks Bertha. What Is It? - The New York Times

In October, workers walked through the first rings of the highway tunnel being built under Seattle's waterfront toward the boring machine called Bertha. Credit Washington State Department of Transportation SEATTLE — A secret subterranean heart, tinged with ...

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Bertha breaks through: World's largest boring machine completes tunnel under Seattle

The normally sedate city of Seattle sounded more like the set of a science fiction epic today as the world's largest boring machine, better known as "Bertha", roared and screeched its way into the open air in the shadow of the iconic Space Needle.

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Big Bertha -- world's largest tunnel boring machine -- facing big Seattle challenge - YouTube

Named after one of Seattle's early mayors, the $80 million drill Big Bertha is 326 feet long, weighs 6,700 tons, and does much more than drill. John Blacksto...

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SR 99 Tunneling machine animation (2013) - YouTube

SR 99 Tunneling machine animation (2013) wsdot Loading... Unsubscribe from wsdot? Cancel Unsubscribe Working... Subscribe ... Jumbo transports largest tunnel boring machine 'Bertha' - Duration: 2:20. Jumbo Maritime 27,917 views 2:20 Animation of the ...

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video of bertha tunneling machine

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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Watch Bertha, the world's largest tunnel boring machine, emerge from beneath Seattle – GeekWire

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. GeekWire was on site, waiting (watch ...

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The World's Largest Tunnel-Boring Machine Must Be Saved

What do you do if you're operating the world's biggest tunneling machine and something goes wrong? You're digging along, everything fine, the machine's five-story maw about to chew beneath the skyscrapers of one of the great American cities. Then suddenly one day things are not so fine. Bertha

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Bertha | The Seattle Times

Read more about the technical challenges and rising costs of the Highway 99 tunnel project, and the successes and travails of Bertha, the biggest-ever boring machine. ... Inside Highway 99 tunnel: Bertha's done digging, but the roadway work rolls on Done with ...

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