Feb. 20 update: Tidying up the access pit
Posted on Feb 20 2015 4:51 PM
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.
Repair plan resources:
- Video of Bertha's breakthrough (links to YouTube)
- Time-lapse camera view of access pit
- Narrated video (links to YouTube) explains STP’s repair plan in detail
- Time-lapse video (links to YouTube) shows assembly of the massive crane that will lift Bertha to the surface for repairs
- Video of crews chipping (view on YouTube) a Bertha-sized circle on the face of the pit’s southern wall