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Below Bertha, SR 99 Tunnel Project, Seattle, WA

This 360-degree photo is part of a virtual tour of the SR 99 Tunnel Project in Seattle. Learn more about the Alaskan Way Viaduct Replacement Program at or follow Bertha, the SR 99 tunneling machine, on Twitter @BerthaDigsSR99.

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Big Bertha: Mystery object blocks Seattle's tunnel …

Big Bertha doesn't just drill - it installs concrete wall panels as it goes, leaving a finished tunnel behind. "This is a work of art," said Hauser. "This is absolutely a work of art and it's going to be beautiful when it's finished."

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Bertha, which at 57.5 feet in diameter was the world's largest tunnel-boring machine when it entered the ground, ends its four-year, 1.7-mile odyssey beneath Seattle today, its job to dig a new vehicle tunnel completed.

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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. An abbreviated history of Bertha:

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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 ...

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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. Gizmag took a look inside the giant machine.

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The tunneling machine Bertha will mine through the five-foot-thick concrete wall of the disassembly pit, an effort that is expected BERTHA to take several hours. 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 …

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Alaskan Way Viaduct - Follow Bertha. Follow Bertha Thank you for following Bertha. The SR 99 tunneling machine, nicknamed Bertha, has completed her work.

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Bertha – The World's Largest Tunnel Boring 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. This $2 Billion megaproject is an incredible feat of engineering on so many levels. I was in Seattle in September …

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Seattle's Big Bertha Tunneling Machine Is Finally …

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 feet since December 22.

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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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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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The Best Products for Tough Jobs You won't be alone when you buy a Robbins TBM. If you are planning to tunnel through rock, you want a TBM from a manufacturer who will support you as your partner throughout the project, anywhere in the world. A successful job comes from using a reliable, fast TBM.

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Apr 03, 2017 · The scene looks quiet, but Bertha, the SR 99 tunneling machine, is grinding through the earth on the first leg of her journey under downtown Seattle in August 2013. Send Inquiry big bertha tunnel boring machine history - Roadheader ...

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Prosaic Pipe Stymied Seattle's Big Bertha - The …

Jan 04, 2014 · SEATTLE — The unknown object buried beneath this city, big enough to stop the world's largest-diameter tunnel-boring machine in its tracks last month and tantalizing enough in its mystery to set off a cottage industry of wispy romantic speculation, turns out to be an ordinary metal pipe, tunnel ...

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Designer Edge Image of the Day – Bertha The …

Under the city of Seattle, Bertha, the world's largest tunneling machine is at work excavating what will soon become the 1.7-mile long SR99 tunnel. At an astonishing five stories tall, and 326 foot long, Bertha represents a marvel of modern engineering. Once at full bore Bertha will be able to ...

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Bertha breaks through: Watch the tunnel boring machine…

The disassembly pit, pictured in March 2017, awaits Bertha, the tunnel boring machine digging the SR 99 tunnel. WSDOT/Flickr 1:30 p.m.: The cutterhead has stopped spinning, and Bertha's work is done. The next step is for crews to remove the braces supporting the walls of the pit, which could take ...

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Bertha (tunnel boring machine) - Wikipedia. Alaskan Way Viaduct - Follow Bertha. Follow Bertha Thank you for following Bertha. The SR 99 tunneling machine, nicknamed Bertha, has completed her work.

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Bertha, Seattle's SR 99 Tunneling Machine, Is …

Apr 04, 2017 · Bertha the tunneling machine broke through a new concrete wall into a disassembly pit. At first it was hard to see the machine's arrival through clouds of dust.

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The World's Largest Tunneling Machine Is (Finally…

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. And yesterday, the Bertha's broken cutter head was finally hoisted out of the Earth.

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