May 8 project update: Cutterhead lifts begin
Seattle Tunnel Partners has started lifting pieces of the SR 99 tunneling machine Bertha’s cutterhead out of the disassembly pit near Seattle Center. To date, three of the cutterhead’s eight small spokes have been cut and lifted from the pit.
This new video shows how workers use torches to cut the 57.5-foot-wide cutterhead into pieces. More than 35 lifts will be needed to remove the cutterhead alone – which weighs more than 900 tons. The full disassembly process is expected to last up to five months.