Bertha (tunnel boring machine) - Wikipedia
Bertha was a 57.5-foot-diameter (17.5 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle, Washington, United States. [2]
Who Killed Bertha? Why the Seattle Tunnel Disaster Isn't What It …
Sometime during the midnight shift on Wednesday, December 3, 2013, just about 1,000 feet into a planned 9,270-foot journey, Bertha, the tunnel-boring machine (TBM) made by Japans Hitachi Zosen, smashed through a 120-foot-long steel well casing, pushing it high above the ground.
Bertha, Seattle's SR 99 Tunneling Machine, Is Finally Done Digging - WIRED
2017年4月5日 · Bertha has broken through. After nearly four years underground, Seattle’s beleaguered boring behemoth clawed its way into daylight yesterday, leaving a 1.7-mile tunnel behind it.
After 4 Years, Seattle's Giant Tunneling Machine Finally Breaks ... - WIRED
2017年4月5日 · Bertha, the largest boring machine in North America, has reached the light at the end of the tunnel, after getting stuck, and sitting motionless underneath the city for two years.
Bertha is officially completely dismantled - Curbed Seattle
2017年8月23日 · It’s the end of an era: Bertha, the much-maligned tunnel-boring machine that drilled the State Route 99 Viaduct replacement tunnel, has officially completely come apart.
Why is Bertha stuck? WSDOT's 5 levels of tunnel-drilling hell
2014年1月20日 · The world's largest tunnel machine, Bertha, is stuck 60 feet beneath Downtown Seattle. The tunnel contractor has drilled down, pumped out and pressurized a gap in front of the machine and is sending divers down 24/7 to try to figure out what brought the machine to a standstill nearly seven weeks ago.
The end is near for Bertha: After nearly 2 miles in 4 years, tunnel ...
2017年3月31日 · Bertha is on pace to emerge into daylight in a few days and push its way into a pit in South Lake Union, where the one-time world’s biggest tunneling machine will be cut apart and trucked away....
How did we get here? A look back on Seattle’s tunnel machine Bertha
2017年3月10日 · After launching in 2013, the world's largest tunnel-boring machine has less than 220 feet to go before finishing its 1.7-mile trip. Here's a look back on the tumultuous dig that's years behind...
What happens to Bertha after digging is done? We’ve got …
2017年4月4日 · What happens to Bertha once the job is done? Bertha’s front end will be carved up and trucked away. The rest will be pulled out of the Sodo end of the tunnel.
Seattle Restarting Bertha, the Broken Tunnel Machine | Fortune
2015年12月3日 · Almost exactly two years after the breakdown of one of the world’s largest underground drills, Seattle will finally resume work on the massive Alaskan Way Viaduct tunnel later this month. The...