The Bertha Tunnel Boring
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After 4 Years, Seattle's Giant Tunneling Machine …
Bertha, the largest boring machine in North America, has reached the light at the end of the tunnel, after getting stuck, and sitting motionless underneath the city for two years.
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Bertha, Seattle's SR 99 Tunneling Machine, Is …
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.
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Gizmag goes inside the world's largest tunnel …
"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. Gizmag took a look inside the giant ...
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Bertha timeline: From conception to tunnel completion
Seattle Tunnel Partners Project Director Chris Dixon said repairing Bertha has taken longer than anticipated. Read more. Testing on Seattle's tunnel boring machine was stopped temporarily due to a ...
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Judge finds that tunnel contractors threw away …
Seattle Tunnel Partners blamed a buried steel pipe for the 2013 breakdown and two-year repair of tunnel-boring machine Bertha, but the contractors lost six pipe fragments that a judge calls ...
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How a Tunnel Boring Machine (TBM) Works
Disassembly of Bertha reveals the inner workings of a machine that completed a 9,270 foot tunnel in Seattle. The Four Systems of a Tunnel Boring Machine. A tunnel boring machine has four basic systems: ... Crossover Tunnel Boring Machines. Crossover TBMs are used for mixed ground tunneling. This one TBM replaces the need …
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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. Share 20 Tweet Share Reddit Email.
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This is how a tunnel boring machine will burrow a viaduct
A portion of Seattle's Alaskan Way Viaduct is being replaced by a deep tunnel, and the machine purpose-built for the job is the world's largest tunnel boring machine (TBM), christened "Bertha."
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Bertha – The World's Largest Tunnel Boring Machine
On the Alaska Way Bored Tunnel, Bertha will be as much as 215 feet below the ground surface, and perched groundwater tables will result in hydrostatic pressures of up to 7 bars (14.6 ksf, 101 psi) at the tunnel invert. Bertha must resist these pressures to avoid ground loss and protect the tunnel and workers from incursions of …
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SR 99 tunnel
The tunnel boring machine "Bertha" began digging the SR 99 tunnel in 2013. Bertha completed her dig in 2017 and the tunnel opened to drivers on February 4, 2019. Milestone. February 2001. Nisqually earthquake damaged the viaduct. 2009.
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Trial begins in case of Bertha breakdown and Seattle's SR 99 …
Goodnight also said STP didn't test or operate the tunnel boring machine, known as Bertha, properly when digging began in 2013. RELATED: Unexpected costs added nearly $58 million to SR 99 tunnel ...
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The end is near for Bertha: After nearly 2 miles in 4 years, …
The celebrity boring machine's arrival near Seattle Center, some 29 months late, guarantees a Highway 99 tunnel bypassing downtown. And the Alaskan Way …
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Tunnel machine Bertha moves 300 feet, reaches 'safe haven'
Tunnel-boring machine Bertha has reached the maintenance stop known as "Safe Haven 3," just before its spring dive underneath the Alaskan Way Viaduct.
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Bertha breaks through: World's largest boring machine …
The tunnel boring machine, better known as "Bertha" cut through a wall of reinforced concrete in the shadow of the city's iconic Space Needle at about 11:15 am, completing the last few feet of a ...
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The Bertha Tunnel Boring Machine Completes Seattle's Big …
The Bertha tunnel boring machine was so large that WSDOT conducted a tour inside of it, complete with catwalks, ladders, stairs, a control room, and several break rooms.
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Under Seattle, a Big Object Blocks Bertha. What Is It?
In October, workers walked through the first rings of the highway tunnel being built under Seattle's waterfront toward the boring machine called Bertha.
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World's largest tunnel boring machine lands in Seattle
Known affectionately as Bertha, this tunnel boring machine has the widest diameter of any boring machine ever built; 57.5 feet. It's being used to dig a highway tunnel under downtown Seattle and ...
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They're Finally Freeing Bertha, the Biggest Tunnel-Boring …
Bertha, the giant boring machine in Seattle that's been stuck in a subterranean hellscape since December 2013, is finally going to see the light of day once again.Her drilling head is free and ...
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New photo book 'Supertunnel' chronicles Bertha's …
"Supertunnel: Fromt Light to Light," by photographer Catherine Bassetti, is a self-published coffee-table book that tells the story of Bertha, the world's largest tunnel boring machine, and the ...
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America's Biggest Tunnel-Boring Machine Is Stuck Beneath …
Poor Bertha.North America's largest tunnel-boring machine, measuring 57.5 feet in diameter, hasn't moved more than 4 feet along its 1.7-mile route since Dec. 7. And she isn't going anywhere soon ...
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Hard grind: The epic journey of the world's biggest tunnel …
TBMs are actually not that new. The first one was built by the famous engineer Sir Marc Kingdom Brunel in 1825 to dig the Thames Tunnel at Wapping in London. Along with Thomas Cochrane, Brunel invented a machine that was basically a giant iron can, called a "shield", turned on its side with one end open. The closed end i…
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Who Killed Bertha? Why the Seattle Tunnel …
Sometime during the midnight shift on Wednesday, December 3, 2013, just about 1,000 feet into a planned 9,270-foot journey, Bertha, the tunnel-boring machine (TBM) made by Japans …
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Bertha (tunnel boring machine)
Bertha was a 57.5-foot-diameter (17.5 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle, Washington, United States. [2] It was made by Zosen Sakai Works in Osaka, Japan, and the machine's assembly was …
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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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Bertha's boo-boo: Why the world's largest tunnel boring …
It's been two months since the world's largest tunnel boring machine stopped drilling underneath Seattle, but now the state Department of Transportation has an idea of what's keeping Bertha from ...
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Bertha's Two-Mile Subterranean Journey Is Almost …
More than 150 feet below the streets of Seattle, Bertha presses on, boring a 57.5-foot diameter tunnel underneath the city. The largest tunnel boring machine (TBM) in the world when it was...
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'Bertha' Does The Heavy Lifting In Seattle Tunnel Project
The world's largest tunnel boring machine in a few months will begin digging a new double-decker highway tunnel under downtown Seattle. If all goes according to plan, Bertha will start digging ...
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After 4 Years, Seattle's Giant Tunneling Machine …
Bertha, the largest boring machine in North America, has reached the light at the end of the tunnel, after getting stuck, and sitting motionless underneath the city for two years. Released on 04 ...
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How did we get here? A look back on Seattle's tunnel …
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 …
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What happens to Bertha after digging is done? We've got …
At 57 feet, 4 inches in diameter, Bertha was the world's largest boring machine when it began tunneling beneath Seattle. But a German company …
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