McAlpine Lock and Dam Louisville, Kentucky Back to Project List Post-Tensioned Rock & Soil Anchors Drilling Anchor tieback system stabilizes existing 600 and 1200 foot long locks prior to the construction of a new 1200 foot lock. Project Overview: Layne GeoConstruction designed and installed a total of 498 double corrosion protected anchors to stabilize existing 600 and 1200 foot long locks. Anchor loads and types ranged from 75 kips to 1,652 kips, and from 1” grade 150 ksi to 47 strand 270 ksi tendons, respectively. Corrosion protection was provided using corrugated sheathing in the bond zone and smooth polyethylene sheathing in the bonded zone. Specialty drill equipment was designed to accommodate limited access anchor locations. Horizontal bars were installed from exterior lock face using a platform drill hung from a 40 ton crane.     Value of Work Performed: $3,200,000 Project Duration: 12 months Project Completion Date: November 2001 Project Reference: General Contractor Morrison Knudsen / Lane Construction Joint Venture Bruce J. Weinberger (502) 772-7155