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America's Biggest Tunnel-Boring Machine Is Stuck Beneath ...

America's Biggest Tunnel-Boring Machine Is Stuck Beneath Seattle ... North America's largest tunnel-boring machine, measuring 57.5 feet in diameter, hasn't moved more than 4 feet along its 1.7 ...

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Herrenknecht AG, one of the world's biggest tunnel-boring machine makers, says it is providing machines for as many as 100 projects annually, up from 20 some 15 years ago.

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America's Biggest Tunnel-Boring Machine Is Stuck Beneath Seattle. It's not uncommon to see damaged seals or bearings on tunnel-boring machines—WSDOT even put in its design-build contract that Seattle Tunnel Partners needed to have a spare $5 million bearing on hand in case of a problem with the original.

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4/27/2015 · Big, Bigger, BIGGEST! 3 MASSIVE MACHINES that move (and work!) (World’s biggest / largest ever built!) NASA CRAWLER-TRANSPORTERS: The NASA crawler-transporters are …

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America's Biggest Tunnel-Boring Machine Is Stuck Beneath Seattle. Feb 20, 2014 ... Poor Bertha. North America's largest tunnel-boring machine, measuring 57.5 feet in diameter, hasn't moved more than 4 feet along its 1.7-mile ...

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"America's Biggest Tunnel-Boring Machine Is Stuck Beneath Seattle - Popular Mechanics" "Hard grind: The epic journey of the world's biggest tunnel boring machine" "Bertha awaiting dismantling at Osaka, Japan before making its way to Seattle (Image: WSDOT." "Free tours of viaduct construction, world's largest tunneling machine"

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America's Biggest Tunnel-Boring Machine Is Stuck Beneath Seattle. ... Bertha, the world's biggest tunnel-boring machine, overheated and quit digging on Dec. 6, 2013. The machine is stuck near Pioneer Square, some 1,083 feet into the 9,270-foot route from Sodo to South Lake Union.

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