ALM paired a GMK3050-1 with a GMK5250L to complete the indoor tandem lift.  Both cranes were configured with minimal boom lengths, and operators lowered them to a minimum angle to account for the low headroom on site.

Using the cranes’ telescoping boom abilities, the operators were able to lift and position the zinc tray at an extremely low angle. Special dispensation was made to bypass the cranes’ anti-two-block system to allow them to lift as close to the facility roof as possible.

Hoist speeds were also reduced, and an additional supervisor was employed to check the distance between the boom nose and hook block, ensuring the lift was performed optimally.

ALM is headquartered in Illkirch-Graffenstaden, a suburb of Strasbourg in France. The company has a total of six Grove cranes in its fleet.