Tag Archives: Tunnel Boring Machine

SR 99 Tunnel Boring Machine

The Washington State Department of Transportation has released photos of the world’s largest-diameter tunnel boring machine — five stories tall — being built in Japan, which will be used to dig the new State Route 99 Tunnel that will replace the Alaskan Way Viaduct. The machine is being built by Hitachi Zosen, a company that specializes […]

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