Rock Anchors & Tie-downs

A Rock Anchor or Tie-Down is a tension element which is used to counteract uplift and overturning forces acting on foundation structures. Rock anchors are typically designed as active tension elements but can also be designed as passive systems. Rock anchors achieve their capacity through the frictional bond between the rock surface of a drilled hole and the cement grout placed into it. The rock anchors can achieve high loads as seen in many dam projects or smaller loads spread throughout a concrete slab, as seen on many water treatment facilities. The required load is transferred to the rock through the reinforcing steel which carries 100% of the tensile load.