Two-crane lifts can present plenty of challenges. One of the first questions to ask is, “Can one crane make the lift?”
If we discover that two cranes must be used, due to capacity and radius, then attention must be paid to the load applied to each crane hook.
Let’s determine the distribution of weight between Cranes A and B, based on the illustration provided. Use the Journeyman Rigger’s Reference Card, Panel 2, to help identify the loading to Cranes A and B.
Tip: First, calculate the lifting beam’s weight as applied to A and B. Second, calculate the load and rigging weight of 36,000 lb as applied to cranes A and B. Third, add A’s values and then B’s. (Answers below).
Happy trails to all my crane and rigging friends,
Mike Parnell
ITI-Field Services
P.S. This article was originally published in The Pro Rigger – Two-Crane Lifts – Big Crane Little Crane.
Answers:
