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Tag: Seattle SR 99 tunnel
Roadbuilding
A 360-degree view inside Bertha and construction of the SR 99 tunnel
The Washington State Department of Transportation (WSDOT) has created a video featuring 360-degree views inside the SR 99 tunnel as Bertha, the world’s largest tunnel boring machine, makes its way underneath Seattle. The department says this feature provides the best way to provide a view of the “record-breaking size” of the tunnel without taking a […]
March 14, 2017
Roadbuilding
A drone’s-eye view of Bertha’s work inside Washington’s SR 99 tunnel
Bertha, the largest tunnel-boring machine in the world, is back at work once again and tunneling below the Alaskan Way Viaduct which its SR 99 tunnel will replace. But just a few days before Bertha descended below the Seattle viaduct, Washington State Department of Transportation officials decided to fly a drone through the incomplete tunnel. […]
May 9, 2016
Construction Equipment
Drilling delays a problem for tunnel-boring machine Big Bertha even as she slumbers below ground
Crews in Seattle are now expected to finish digging a 12-story pit to reach stalled tunnel-boring machine Big Bertha one month later than planned due to concrete pilings proving more difficult to drill through than expected, according to a report from the Seattle Times. Bertha, the world’s largest tunnel-boring machine went down from overheating in late January, […]
July 31, 2014
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