The tunnel liner that is being placed by the Bertha tunnel boring machine consists of precast concrete segments. This video by the WSDOT shows how they are made at the casting yard, and what Bertha does with them once they get delivered to her where the action is happening. The finished tunnel will consist of over 14,000 of these precast segments! [Source: WSDOT YouTube Channel. Image: YouTube]
Related Articles
Bertha tunnel-boring machine arrives in Seattle
April 12, 2013
rockman
Project Related
Comments Off on Bertha tunnel-boring machine arrives in Seattle
Video: Simulation View of Washington SR 99 Bored Tunnel (Alaskan Way Viaduct Replacement)
March 24, 2010
rockman
Project Related
Comments Off on Video: Simulation View of Washington SR 99 Bored Tunnel (Alaskan Way Viaduct Replacement)