On behalf of Munich City Utilities, AKM Autokranvermietung lifted a chimney liner weighing 19 t into the existing chimney of a cogeneration plant in the Freimann district of Munich. With a required lifting height of 119 m, crane operator Klaus Kellner opted for hid Demag AC 500-8 crane.
“Of all the eight-axle cranes available, the Demag AC 500-8 is the only crane that can safely handle the required loads of up to 19 t at this height – otherwise we would have had to use a larger and thus more expensive 700 t or even 750 t crane,” explains Sven Bauer, General Manager of Technology at AKM.
The AKM team had equipped the Demag crane with a 47-m main boom and a 72-m luffing jib in the SSL 60° configuration with 180 t of counterweight.This configuration was calculated from the factors lifting height and weight: “It was clear to us that we didn’t have much room for manoeuver with the lifts. That’s why we also placed bog mats under the outriggers of the AC 500-8 in order to raise the level of the crane and thus gain a little more height,” reports AKM crane operator Klaus Kellner.
AKM also had a customized spreader made of highly tempered steel built especially for this application, in which the holes to accommodate the load slings were precisely matched to the liner segments. “This ensured that we could really go to the maximum allowable hook height,” explains Sven Bauer.