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
Tunneling machine’s front end bolted in place
August 31, 2015
rockman
Project Related
Comments Off on Tunneling machine’s front end bolted in place