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Bertha (tunnel boring machine) - Wikipedia. Bertha is a 57-foot-diameter (17.4 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle.

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Bertha (tunnel boring machine) - Wikipedia

Some media have also referred to the machine as "Big Bertha ... pressure balance tunnel boring machine ... with the repaired cutter drive on August 24, ...

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.

Tunnel boring machine - Wikipedia

A tunnel boring machine ... under the English Channel and the British Parliament allowed a trial run to be ... Bertha completed boring the tunnel on ...

How Bertha will tunnel beneath Seattle’s Alaskan Way Viaduct ...

A diagram shows where Bertha will tunnel beneath Seattle’s Alaskan Way Viaduct. (Via WSDOT.) Bertha, ... and from the tunnel boring machine to ... 24 hours a day, ...

Bertha breaks through: Watch the tunnel boring machine’s ...

... Bertha’s journey is coming to an end on Tuesday—and the big moment ... awaits Bertha, the tunnel boring machine ... Bertha’s had a pretty busy 24 hours.

How to Build a Tunnel: 14 Steps (with Pictures) - wikiHow

How to Build a Tunnel. ... their routes also make the use of a tunnel boring machine impractical because ... constructed in 4,167 hours. Working 24 hours a day, ...

Sinkhole worries loom large as Bertha prepares for dive under ...

Soon after the new year’s restart of tunnel-machine Bertha, ... released to The Seattle Times under public ... a task force would develop a response with 24 hours.

Big Bertha: Mystery object blocks Seattle's tunnel drill ...

The world's biggest tunnel boring machine, ... Mystery object blocks Seattle's tunnel drill. ... The $80 million machine, nicknamed Big Bertha, ...

Follow Bertha's breakthrough - The WSDOT Blog

... an effort that is expected to take several hours. ... footage of Bertha's breakthrough, ... com/news/local/seattle-tunnel-boring-machine-bertha-nears-finish ...

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