When lifting lattice boom sections for erection or dismantling, where should slings be attached?

The correct answer is the top chords. When lifting lattice boom sections, it is crucial to ensure that the load is distributed evenly and that the structural integrity of the boom is maintained during the lift.

Attaching slings to the top chords helps to ensure that the weight of the boom is balanced and that it does not twist or become unstable during the lifting operation. The top chords are designed to handle the compressive forces that occur during lifting, making them the ideal attachment points for the slings. This method also minimizes the risk of damage to the boom structure.

In contrast, attaching slings to the base or other sections might lead to an uneven lift, which could compromise the safety of the operation. Proper attachment at the top chords promotes a more controlled and safe maneuver. Utilizing the design features of the lattice boom ensures that it can be lifted effectively without risking structural failure.