Scaffold Components, Materials, and Erection/Dismantling Procedures
Candidates must recognize components and their condition. Tube-and-coupler systems rely on right-angle, swivel, and sleeve couplers; system scaffolds (frame, modular) use prefabricated frames, ledgers, and lockable connections. Planking must be scaffold grade, sound, and free of splits or rot; metal decking must be secured against displacement. Adjustable base jacks level the scaffold, and casters must be locked during use. Ties anchor the scaffold to the structure; bracing includes ledgers, diagonal braces, and plan braces.
Erection follows a sequence: plan and inspect the site, set sills and base plates, erect standards and ledgers, install bracing and ties, place platforms and guardrails, then inspect before use. Traps include mixing components from different systems, using damaged or makeshift couplers, and forgetting that a scaffold is not complete until bracing, ties, and guardrails are in place. Dismantling is the reverse of erection, top-down, with pieces lowered - never thrown. Fall protection and a controlled access route are required during erection and dismantling, and the area below must be barricaded.
Worked example: A crew erects two lifts before installing ties. The rule of thumb: install ties and bracing as you go, not after - an untied scaffold is a stability hazard even at low height. Stop work until ties are in place and inspected.