Spreader Beam
Spreader Beam
(OP)
Is there a criteria or a rule of thumb on how long a spreader beam needs to be for a crane lift? I have always made the spreader beam at least 1/3 of the span of the beam being lifted as my length. I have a situation were I cannot do that and I was wondering if there is any criteria for stability and locating the C.G. of the pick. Please respond. Thanks all






RE: Spreader Beam
RE: Spreader Beam
RE: Spreader Beam
For example:
Beam to be picked is 128 feet long and weighs 55 kips. How long should the spreader beam on the rigging be?
RE: Spreader Beam
RE: Spreader Beam
The whole purpose of a spreader beam is so that the cables to the lifted member are vertical and therefore do not induce additional bending/axial load into the member from their horizontal component.
Most designers will try to locate the lifting points at the location where the minimum stress is induced in the member (equating cantilever moments to mid span moments).