When performing the “multiple lift rigging procedure” and lowering beams into place, special attention must be given to recognizing and avoiding any overhead obstructions that could interfere with the hoisting and rigging process.  Serious incidents have occurred during this procedure when beams have snagged column splices or fabricated connections while lowering the structural members into final position. Connectors must be in direct contact with the crane operator through hand signals or verbal communications at all times.  In some cases when hoisting and rigging “in the blind,” it may be necessary to have a signal person in place to provide signals to the crane operator.

In the below illustration, the connectors are ensuring that the second beam in the multiple lift rigging assembly is safely clearing the column splice to avoid contact, and are in direct contact with the crane operator using standard hand signals.

In some cases, the qualified rigger may decide to “skip a hook” on the rigging assembly to provide additional clearance for the connectors and help prevent contact with column splices.  In the illustration to the right, the second beam was rigged at the top of the assembly additional clearance.  Performing the “multiple lift rigging procedure" requires special training on the recognition and avoidance of hazards, and the proper techniques to avoid potential rigging incidents.  This training is provided at your local training facility through the National Training Fund.  Please contact me at (202) 383-4820 or srank@iwintl.org if you have any questions regarding the “multiple lift rigging procedure."