Date: 03/26/2009 Views: 8669
Date: 10/17/2007 Views: 5261
Date: 01/23/2006 Views: 3805
Date: 08/23/2023 Views: 709152
The area where the tie bar passes through a depression in the tunnel has to be prepared for closure. The tunnel depression with the areas of fiberglass and foam core removed in preparation for closure.