World's Largest Hard-rock Tunneling Machine Powered by Nexans AmerCable


Nexans AmerCable to Power World’s Largest Tunnel Boring Machine

When the city of Seattle needed a new tunnel to replace aging highway SR99 above-ground infrastructure, they selected Hitachi Zosen Corporation of Osaka, Japan to create the world's biggest tunneling machine. When Hitachi Zosen needed tough, flexible GG-C and VFD power cables to power this giant they selected Nexans AmerCable.

With a 57.5 ft. external diameter, 326 ft. length and weighing in at 5,500 tons this is no ordinary piece of tunneling equipment. Projects at this large scale requires safe, highly reliable power cables to keep up with their ambitious drilling schedule.

The TBM is being manufactured in Osaka, Japan, and will be roughly the same size as the largest Washington State Ferry. Assembly and testing will be completed in late 2012, then the machine will be disassembled and shipped to Seattle in early 2013. It will then be reassembled inside the launch pit and begin boring the nearly two-mile-long tunnel in summer 2013. The SR99 tunnel is scheduled is scheduled to open for traffic in late 2015.

For all sizes of tunneling projects, Nexans AmerCable has a cable productivity solution for you!

For more information:

World's Biggest? No, this is a smaller TBM used to dig the Calle M30 tunnel in Madrid Spain.
"Big Betty," one of the previous "world’s largest hard-rock TBM" was powered by AmerCable Tiger® Brand cables.
(Left to right) AmerCable’s Murray Duncan and Kaye Barnett pose with Strabag's John Compostella at the Niagra Tunnel worksite.

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