(Image downloaded from repair-pit camera after 5 pm today)
22 feet down, 35 to go for the Highway 99 tunnel machine, one day after it broke through the wall of the pit from which its cutterhead will be lifted for repairs. But it’s idle for now, as explained in this late-afternoon update from WSDOT:
After a few days of steady digging, Seattle Tunnel Partners is taking a break from mining so crews can clean out the bottom of the access pit. As expected, a mixture of dirt, concrete and water came into the pit along with the tunneling machine during Thursday’s breakthrough. Crews are using vacuum trucks and other tools to remove the material.
Once Bertha’s cradle is cleaned off, crews will continue moving the machine forward. Bertha must travel an additional 35 feet before STP and manufacturer Hitachi Zosen can begin the disassembly process. Since mining resumed late Tuesday, Bertha has moved nearly 22 feet.
Meantime, the SDOT director’s report we mentioned in an earlier story includes a few related notes. For one, SDOT director Scott Kubly writes, the city’s plan to independently evaluate the Alaskan Way Viaduct is proceeding: “Initial consultant scope, to be completed by early to mid-March, focuses on technical review of 2010-2014 studies of the viaduct and serviceability/safety for use of the viaduct structure.” Later in the report, he writes, “Bridge engineers responded to a report that concrete had fallen off the Alaskan Way Viaduct near Seneca Street. No significant defect was noted and it appears to be the continued minor deterioration of the aging structure.” (The date when this happened wasn’t mentioned.)
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