Scaffold hoist frame

dangeruss

dangeruss

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Need a bit of help
Built a frame on the roof of a building to allow a scaffold hoist to be attached to it. The load the hoist is lifting is 75kg over a height of 25m.
The safety officer wants to know if the scaffold frame ( attached to the steel rsj in four locations using 8 beam clams) will safely take the imposed load applied to it.
We built the frame on Friday afternoon and he's requested a design or the calcs to prove the design before Tuesday morning.
Can anybody give me some equasion to give him tokeep him off my case.

The frame consists of two four board readylocks as transomes, the tubes from the steel to the winch are 10ft long.

Picture enclosed
 

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Tidy Job danger they never say that do they!
 
They wouldn't know a tidy job if it fell off the roof and hit them. Ive built loads of frames for scaffold hoists and never had to "prove" the scaffold its secured to before, especially over a bank holiday weekend, with sun !!!
 
Im no desighner but it looks more like a tie/pull back than a frame so surely the slip loads of the associated fitting used + a bit of blagging would surfice or tell thm its not ur job as we arnt qualified to fit hoists or sighn them off & he'll need to get a lola certified engineer to do that for him....wont take em long to realise that what uve done is ok
 
It more than likely will be down to engineer, the point where the plan brace/wing ties cross the ledger may have deflection as they are not near the node, so unless it is easily within the allowable loads it may be a case of adding another transom ans standards down to the inclined tubes
 
There's an upside down readylock tieing the two standards together at the base. The two plan braces are fixed seperatley to the beam about 1500mm away from the main ledgers.
The hoist only has a working load of 300kgs ! ffs !! Its going nowhere.
Typical safety officer expects to get a design on a Friday afternoon ready for work on Tuesday.

---------- Post added at 07:48 PM ---------- Previous post was at 07:46 PM ----------
Havespannerwilltravel said:
Any specs with the actual hoist dangerus? The Saga ones used to have a fixing diagram years ago maybe this one does as well?
Click to expand...
If it was only as simple as that mate !
 
To be honest there Dangeruss, for a 75kg (~0.75kN) hoist I think you have gone you a bit a heavy on the gear; even when adding 25% for the test load. As long hoist and clamps are installed as per manufacturers instructions he should be able to pass this by inspection. Providing he knows his noodles that is.

All in all that is a tidy little rig mate.
 
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