1. Equalizer beam web under center equalizer pin (bottom left) 2. End pipe stub column at bolted flange plate (top right) 3. End pipe stub column at equalizer beam bottom flange (bottom right)
Equalizer beam fatigue cracking has occurred in many rubber tire gantry cranes at various locations. The fatigue cracking is caused by a combination of factors including high fatigue stresses, undersirable design details, and poor workmanship.
Liftech has been involved in several RTG equalizer beam repairs. We have investigated the cause of the fatigue cracking, performed structural analyses, provided modification concepts, assessed the effectiveness of the modifications, and helped develop new equalizer beam designs.
Liftech’s studies indicate that the modifications and new designs will significantly improve the fatigue performance of the equalizer beams.