Connecting concrete panels in the SR 99 tunnel
A view of the joint between two of the 1,152 panels that will form the northbound (lower) roadway deck in the SR 99 tunnel. Crews will later thread steel cables through the holes visible in the rectangular pockets. The cables are then pulled tight in a process known as post-tensioning. Post-tensioning locks the panels together so they act as a cohesive unit. After post-tensioning, crews will fill the holes and pockets with grout, and seal the gap between the panels.
Learn more about the Alaskan Way Viaduct Replacement Program at www.alaskanwayviaduct.org or follow us on Twitter @BerthaDigsSR99.
Connecting concrete panels in the SR 99 tunnel
A view of the joint between two of the 1,152 panels that will form the northbound (lower) roadway deck in the SR 99 tunnel. Crews will later thread steel cables through the holes visible in the rectangular pockets. The cables are then pulled tight in a process known as post-tensioning. Post-tensioning locks the panels together so they act as a cohesive unit. After post-tensioning, crews will fill the holes and pockets with grout, and seal the gap between the panels.
Learn more about the Alaskan Way Viaduct Replacement Program at www.alaskanwayviaduct.org or follow us on Twitter @BerthaDigsSR99.