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Tag: largest tunnel-boring machine
Roadbuilding
Last road panel installed in Seattle SR-99 tunnel dug by Bertha
The Washington State Department of Transportation reports that the last of 1,152 road panels have been installed on the new State Route 99 tunnel, which will replace the Alaskan Way Viaduct. The panels form the lower deck of the double-deck highway, which will allow drivers to travel under downtown Seattle as a bypass or stay […]
April 2, 2018
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
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Big Bertha’s delays have pushed back the opening of the tunnel it’s digging by 20 months…so far
Seattle’s new State Route 99 tunnel is officially 20 months behind schedule, and it’s all Bertha’s fault. The Associated Press reports Washington State Department of Transportation officials are now saying that the new tunnel being dug beneath Seattle by Big Bertha, the largest tunnel-boring machine in the world, won’t open until August 2017. And they […]
December 24, 2014
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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