Spin-Lock Rock Anchor Case Histories:
Alta St. Restoration, San Francisco, CA

During heavy rains in March of 1992 a portion of an existing multi story apartment building on Telegraph Hill fell away & tumbled 150 ft. down a cliff. The entire structure was then removed because of potential danger below (building/pedestrians). Construction of a temporary platform to support heavy equipment to reach out and perform permanent slope stabilization work began. Below retaining wall, over 50 each twenty one ft. long by 1-3/8" Williams Hollow Rock Bolts were placed, grouted and pre-tensioned using a crane support. During prestressing of Rock bolts to stabilize cliff face, a pneumatic torque wrench was used to increase productivity while a crane supported the unit and worker. By using Williams Hollow Core Rock bolts and standard NC thread torquing system, a large cost savings was absorbed. All project members are legitimately proud of their accomplishment of this high profile project performed under difficult time, weather and access requirements.

Main Reason They Chose Williams