Demolition of Krøll K 600 tower crane, with two mobile cranes (Grove GMK 5220 and Demag AC 200), Haugesund, Norway Oct. 2012
It looks like they were trying to dismantle the horizontal boom of the tower crane, but under estimated the weight, which made the cranes tip over. Had they prepared a lift plan? The 6 P’s again?? Proper Planning Prevents Poor Piss Performance!!!
Note from the editor:
After some investigation I have found out the cause of this incident:
I spoke with the inspector, who investigated the accident. Indeed, they did not put the counterweight on the crane, as they only had to lift 11 tons. The jib of the K600 Kroll crane weighed some 36 tons and the Grove took the side with 11 tons weight at short radius. They “thought” they were within reach of the cranes load chart, but when taking it off and booming out, they soon were out of range with the result of tipping of the crane.
Lessons learned:
- Do not use the crane without the counterweight fitted!!
- Be prepared for unforeseen circumstances

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