Seattle Tunnel Partners continues to work around the clock as they disassemble the SR 99 tunneling machine near Seattle Center. The face of the machine has dwindled in size as most of the cutterhead has been removed.
Crews are also removing more pieces of the machine’s outer shield, exposing inner parts that weren’t previously visible from the pit. This includes the articulation jacks, which allowed the machine to change direction as it pushed beneath downtown Seattle.
As work on the machine continues in the pit, disassembly is progressing from inside of the tunnel as well. STP is dismantling the trailing gear and disconnecting temporary utilities and ventilation that were necessary for the machine’s operations. These pieces are being removed through the south end of the tunnel. The below photos show disassembly progress, both in the disassembly pit and in the tunnel. Disassembly progress can also be tracked through the construction camera.
An STP worker assists the crane operator with the removal of a piece of the tunneling machine.
Removing pieces of Bertha’s shield reveals the inner-workings of the tunneling machine.
A welder cuts a section of the shield for removal.
Crews are also disassembling the machine from inside of the tunnel.
May 2017 aerial view of the tunneling machine in the disassembly pit.
Inside the tunnel, crews are hard at work on more than just removing the trailing gear. STP has now completed 66 percent of the southbound roadway and the corbels (wall foundations) are approaching the rear of the tunneling machine. The latest report tracking interior structures progress can be found in the information box on the Bertha page of our website.