NASCLA Accredited Commercial General ContractorMetalsMedium
A steel erector is installing a large, heavy steel beam into its final position. To ensure the safety of the workers and the stability of the structure during the hoisting and fitting process, which of the following is the most critical initial step after the beam is lifted clear of the ground but before it is permanently connected?
- AImmediately fully tightening all temporary bolts to final torque.
- BMeasuring the beam's length for final verification against shop drawings.
- CApplying touch-up paint to any scratches on the beam.
- DAttaching tag lines to control the beam's swing and rotation.
Show answer & explanationAnswer & explanation
Correct answer: D. Attaching tag lines to control the beam's swing and rotation.
Tag lines are crucial for controlling the movement, swing, and rotation of a hoisted load, especially large beams, preventing uncontrolled impacts with other parts of the structure or workers. This is a primary safety measure during the delicate process of positioning. Other options are either premature or not primary safety measures for a moving load.
Why the other options are wrong
- A. Temporary bolts are initially installed snug-tight; fully tightening them to final torque is done after the beam is plumbed and aligned, and potentially after permanent connections are initiated, not while it's still being hoisted/fitted.
- B. Measuring the beam's length is part of quality control, typically done before hoisting or during final fit-up, not a primary safety step for a moving load.
- C. Applying touch-up paint is a cosmetic and protective measure done after installation, not a critical safety step during hoisting.
Tag Lines
Ropes or lines manually held by workers to guide and control the movement of a hoisted load, preventing uncontrolled swinging or rotation during lifting and positioning operations.
- Essential for controlling suspended loads.
- Prevents injury to personnel and damage to structure/equipment.
- Used during hoisting, positioning, and lowering.
Memory trick: Hoist Safely: Plan, Rig, Guide, Clear.