Flange Clamp

Flange Clamp

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Scaffolding Tube Strength?

If I built a box using standard diameter scaffolding tube (48mm) and connected it using kee clamps rather than standard scaffolding connectors, do you think it would be strong enough to support a 2000lb bar being dropped on it from a 2m height without breaking?

I want to build it without welding, but am concerned over the strength of such a box connected only with kee clamps.

Specifically, I want to build an easy-to-assemble power rack, equivalent in function to this:

http://www.gymratz.co.uk/weight-training-gym-equipment/item685.htm

Instead of the diagonal flange brackets used on all corners in the model shown in the link, I would have a kee clamp. Your thoughts?

A 2000lb mass _falling_ 2 meters will be a demanding load, is that really the kind of load you need to resist? While the tube may be strong enough not to "break" it will most likely be bent with that kind of impact.
What is the wall thickness of your "tube"? My understanding is that Kee Klamps ® are designed for use with pipe, you might end up crushing a thinner wall tube when you tighten the set screws.
I have some recollection of once seeing a Kee clamp catalog that had load values, I don't have it now, but you might check their web site, you could try this: http://www.keeklamp.com/us/Brand.aspx?id=105&typ=1&sub=29 though that page doesn't seem to be quite complete