Bertha begins her week of scheduled maintenance
Bertha, the SR 99 tunneling machine, has pulled into the shop for a tune-up. The shop, in this case, is actually a protected area underground where crews can safely crawl out of the machine to swap out cutting tools and perform other scheduled maintenance. Items on the to-do list include things like changing wheels in Bertha’s segment feeder, checking her high-pressure water system and making adjustments to the conveyor system.
“Bertha is functioning really well,” Seattle Tunnel Partners Project Manager Chris Dixon said. “Our crews are becoming more and more efficient as the tunnel drive progresses, and we’ll continue to make improvements when we resume tunneling following this maintenance stop.”
Overall progress through Oct. 30
Feet traveled since tunneling started: 430
Rings built since tunneling started: 58