tunnel boring machine bertha

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.

#BerthaCam: Watch the giant boring machine at the end of ...

Giant tunnel-drill machine Bertha broke into daylight shortly before 11:30 a.m. Tuesday after years of delays. We covered the scene live.

World's biggest tunnel machine Bertha emerges from beneath ...

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.

See Bertha's disassembly inside the State Route 99 tunnel in ...

Nearly four months after completing its journey into the disassembly pit after digging the two-mile-long State Route 99 tunnel, tunnel-boring machine Bertha is half-dismantled.

Follow Bertha's breakthrough - The WSDOT Blog

The tunneling machine Bertha will mine through the five-foot-thick concrete wall ..., Bertha, Bertha breakthrough, SR 99 tunnel, tunnel boring machine. 38 comments ...

The world's biggest boring machine Bertha is taken out for ...

Contractors building a highway tunnel under Seattle are preparing to remove the world's largest boring machine so that it can be repaired. The gigantic drill, known as Bertha, stopped working in December 2013 after digging just 1,000ft of its two-mile journey to replace the aging Alaska Way, which ...

Big Bertha -- world's largest tunnel boring machine -- facing ...

Dec 24, 2013 · 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...

Tunnel Boring Machine Animation - YouTube

Jan 15, 2013 · This animation shows an example of what a tunnel boring machine looks like and how it works.

| Seattle's tunnel machine Bertha breaks through ...

It's official - Bertha has broken through! Seattle's tunnel boring machine that's been digging beneath the city for the State Route 99 tunnel reached the end of its 1.75-mile journey Tuesday, nearly four years after it embarked on the job. Just before 10 a.m., Bertha pierced the cement wall of the ...

Gizmag goes inside the world's largest tunnel boring machine

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.

World's largest tunnel-boring machine finally breaks through

SEATTLE — The world's largest tunnel-boring machine broke through a ... World's largest tunnel-boring machine finally ... as the machine, known as Bertha, ...

Seattle's tunnel boring machine Bertha reaches end of long ...

Apr 03, 2017 · With a cloud of dust, Bertha — Seattle's tunnel boring machine — reached the end of her long, troubled journey, a milestone in a multibillion-dollar project to replace an aging highway hugging the city's waterfront.

SR 99 (@BerthaDigsSR99) | Twitter

@BerthaDigsSR99. Bertha completed her dig and now we're completing the work to replace the Alaskan Way Viaduct. ... As work continues inside the tunnel, ...

Tunnel boring machine - Wikipedia

A tunnel boring machine ... but stalled in December 2013 and required substantial repairs that halted the machine until January 2016. Bertha completed boring the ...

Seattle tunnel, among world's biggest, takes step toward ...

Apr 03, 2017 · Bertha, one of the world's largest tunnel boring machines, emerged north of downtown Seattle on Tuesday.

Pictured: The world's most powerful tunnel-boring machine ...

The final phase of repairs are being made to get Bertha, the five story-high drilling machine stuck ... tunneling machine that ... the boring machine, ...

Watch Bertha, the world's largest tunnel boring machine ...

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.

Alaskan Way Viaduct - Tunneling

The tunneling machine known as Bertha began tunneling beneath Seattle in July 2013 (photo at right: ... The machine completed its tunneling on April 4, ...

Alaskan Way Viaduct - Follow Bertha

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.

Bertha, Seattle's SR 99 Tunneling Machine, Is Finally Done ...

Apr 03, 2017 · 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 ...

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

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 ...

Big Bertha, world's largest tunnel-boring machine, arrives in ...

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. She's quite hefty too. Bertha is assembled from 41 parts, the largest of which ...

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.

Bertha Finally Breaks Through In Seattle : The Two-Way : NPR

Apr 03, 2017 · Bertha Finally Breaks Through In Seattle : The Two-Way After a two-year delay for repairs, the giant tunnel-boring machine has completed its mission far beneath the city's streets.

Bertha breaks through: Tunnel boring machine completes 4-year ...

The world's largest tunnel boring machine, dubbed Bertha, finished its $2.1 billion, four-year journey drilling a 1.75-mile path under Seattle when it broke through to daylight on Tuesday, according to The Seattle Times. The remainder of the nearly $3.2 billion Alaskan Way Viaduct replacement ...

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