Spin-Lock Rock Anchor Case Histories:
Nantahala Dam Slope Stabilization

A potential slope failure was the reason a 300' vertical slope located next to the Nantahala Dam in western North Carolina was stabilized with the use of Williams Rock Bolts. The engineer chose to use the Williams 1-1/2" R7S 150 KSI "Spin-Lock" Mechanical Anchoring System. The "Spin-Lock" system was specified because of it's unique features which offered several installation advantages over conventional cement grout or resin bonded rock bolts. A grout bonded system would have required a longer bolt and a two step grouting procedure requiring several days between steps resulting in additional drilling time and grouting. Because the "Spin-Lock" generates it's anchorage by mechanical means, it can be installed at shorter lengths than bonded systems and after the "Spin-Lock" is pre-stressed it can instantly be grouted for corrosion protection. The entire installation procedure can be finished with only minutes of transition time between steps. The contractor, Boyles Brothers saved countless hours in labor by utilizing the advantages of the "Spin-Lock" rock bolt system. Stabilizing slopes is just one of the many applications for Williams "Spin-Lock" anchors. They have been used throughout the world for several decades in both concrete and rock applications.

Main Reason They Chose Williams