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Lifting system

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Hi everybody

I'm designing a lifting system to ascend equipments from the ground to a building roof.

Due to some area problems, the winch has to be on the ground, and the arm-crane has to be in lower position by a normal day (same level of the roof), and has to raise itself above the roof about 4-5m, to lift the equipments (about 200kg), then to rotate and bring the equipments on their places.

By design the arm crane, I've taken a safety factor of 1.6 on the 200kg "live load", is anyone have experience with these kinds of structures? Is 1.6 is a sufficient safety factor for the structure bearing the equipments? Is there any code that I can justify the safety factor ?



David Cohen

Chief Engineering Manager






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