March 19 project update: First piece of Bertha removed from the access pit Thursday
Posted on Mar 19 2015 8:18 AM
Seattle Tunnel Partners has successfully hoisted the first piece of the SR 99 tunneling machine to the surface for repairs. Crews lifted the machine's 270-ton upper body to the surface on Thursday afternoon.
Three more pieces of the machine will be removed from the pit as part of STP’s repair plan, which this narrated video (links to YouTube) explains in detail. Up next, crews will lift the upper right and upper left sections of the machine – both of which weigh less than 100 tons. The final lift will bring to the surface Bertha’s massive cutterhead and main drive unit, which weigh a combined 2,000 tons.
Crews lifted Bertha's 270-ton upper body from the pit on Thursday.
A shot of Bertha in the pit following the lift.