Drilled shafts have been installed by Malcolm Drilling to form the secant pile retaining walls to support the 400 ft x 80 ft x 80 ft launch pit for the SR 99 tunnel boring machine on the Alaskan Way Viaduct Tunnel Replacement Project in Seattle. Excavation has commenced on the pit in preparation for the launch of a world record 57.5-ft diameter TBM (until Russia launches a planned 63-ft TBM). The Seattle Times article indicates there are a total of 1400 drilled shafts in the pit walls and nearby, but a press release by WSDOT indicates the walls are comprised of approximately 200 drilled shafts. [Source: Seattle Times via ASCE SmartBrief. Image: WSDOT Flickr]
Related Articles
Eliza TBM Digs for Michigan’s $162M I-75 Project
January 23, 2021
rockman
Project Related
Comments Off on Eliza TBM Digs for Michigan’s $162M I-75 Project
Brightwater tunnel inches through toughest stretch toward finish
February 8, 2011
rockman
Project Related
Comments Off on Brightwater tunnel inches through toughest stretch toward finish
Flickr: kxyoung’s stuff tagged with devilsslide
June 14, 2010
rockman
Project Related
Comments Off on Flickr: kxyoung’s stuff tagged with devilsslide
These are some really fantastic photos of the Devil’s Slide tunnel construction. For those who aren’t familiar, the tunnels will be bypassing a particularly landslide and rockslide-prone portion of the California Coast that is currently […]