Anchorage Tiebacks
Outrigger beams which are not stabilized by bolts or other direct connections to the floor or roof deck shall be secured by tiebacks. The tiebacks should be secured to a structurally sound anchorage on the building or structure, which may include structural members. A good example would be an anchor mounted in concrete with drilled-in fasteners. In your inspection, make sure:
- tiebacks are not secured by vents, electrical conduit, or standpipes and other piping systems;
- a single tieback is installed perpendicular to the face of the building or structure. If a single tieback cannot be installed, two tie-backs must be installed at opposing angles; and
- tiebacks are equivalent in strength to the suspension ropes and hoisting rope.
Workers Killed When Scaffolds Without Tiebacks Fall
Two employees were working on a two-point suspension scaffold without safety belts, lifeline, or tiebacks. They attempted to move a hook to reposition it when the hook slipped off the parapet, causing one end of the scaffold to drop. The victim fell five stories to his death. His co-worker was able to grab on to the scaffold, and climbed to a fire escape.
Knowledge Check Choose the best answer for the question.
5-3. Which is a safe anchorage for tiebacks?
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