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Tag: largest TBM
Roadbuilding
Water main damaged by Big Bertha repair excavation could cost WSDOT $4 million
Four months after crews temporarily stopped excavation on a repair pit for the world’s largest tunnel-boring machine due to ground sinkage, Seattle officials have now identified a major repair needed on a water main damaged by the sinking. Back in December, excavation stopped on the repair pit through which Big Bertha’s massive cutterhead was recently lifted as officials suspected groundwater pumping […]
April 14, 2015
Construction Equipment
Camera gives a live view of construction on Big Bertha’s 12-story repair access pit
Just because Big Bertha is down for nearly a year, that doesn’t mean work around the world’s largest tunnel boring machine has come to a halt. And now thanks to a camera set up by the Washington State Department of Transportation, anyone can watch as that work progresses. After completing one-tenth of the 1.7-mile State Route 99 […]
May 13, 2014
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