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Launch Pit Preparation, SR 99 Tunnel Project, Seattle, WA
USA

Early morning on a cloudy Seattle day in August, the aging Alaskan Way Viaduct is being torn down and the downtown waterfront section is being replaced by a bored tunnel. Drilled shafts are being installed by Malcolm Drilling to form 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 Replacement Program. Excavation of the pit is underway in preparation for the launch of a world record 57.5-ft diameter tunnel boring machine.

Copyright: Bill Edwards
Type: Spherical
Resolution: 11824x5912
Taken: 22/08/2012
Uploaded: 21/08/2014
Updated: 22/08/2014
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Tags: alaskan way viaduct replacement; tunnel; launch pit; wsdot; seattle; washington; drilling; malcolm drilling; tbm; tunnel boring machine; construction
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