huangyhg

mounting equipment overhead
take a 6鈥?piece of 1鈥?sch 40 pipe. drill a hole thru one wall about 1 or 2 inches from each end. stick a piece of 3/8 all thread in each hole and put on a washer and nut (inside the pipe). connect the other end of the all thread to some uni-strut clamped over two steel beams in the overhead then mount 6 lights, each weighing about 20 lb, on the pipe. assume that eventually someone weighing around 180 lb is on a 20鈥?ladder re-aiming said lights and loses his balance with this gizmo the only thing to grab hold of. is this picture as ugly as i want to paint it? just looking for some real engineering data to present to our 鈥渁www, that鈥檒l never fall鈥?contractor.

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pvc pipe is rated for bursting strength (e.g. 1120, sch 40, sch 80) and has no structural strength to speak of. i doubt it would survive the 6-20lb point loads! this situation is dangerous and certainly does not meet any building codes (no way to ascertain structural integrity of the
it is galvanized steel pipe not pvc.
thanks,
db
sorry, i assumed it was pvc. the connections should be welded and should be at least as strong as the pipe itself.
building codes require that, in addition to the dead load, a live load of 250 lbs anywhere along the pipe and in any direction must be resisted (or capable of supporting). that means that each connection must be capable of resisting a 320 lb load (1/2 dl and ll). drilling through this pipe can seriously affect its shear capacity due to an allready small cross section.
i advise having a local structural engineer look at this and advise accordingly.

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