MusicalMuseum

Sorry for the silence! I didn't have notifications turned on, and after reading the first few posts, we had indeed got our answer; very helpful - and thanks again. As a quick update, everything had been hung now, and our rigger agreed that we are absolutely fine, well within load limits and nothing to worry about. Nevertheless, we have now found a new source of these clamps thanks to the information obtained here, and have ordered more to ensure that any future work can have additional supports added if necessary. It's been useful reading through this to remind us that anything that requires rigging at height needs extra scrutiny, and may have consequences we would not have even considered without proper, certified help. Cheers!

@p.k.roberts Thank you so much - Unistrut window beam clamps is exactly what they seem to be. @sandall we do have a lot of architectural paperwork but it does not refer to these fixings, which were added by the team after the shell of our building was constructed. The bars in question were used for some fairly light-duty occasional loads, but will now be permanently equipped with heavier fixtures, and I wanted to be 100% sure we're safe. I am much happier now that I know the design rating of these; and it appears I was being over-cautious - a single bracket is rated for 200Kg+, well over twice the load we will be adding on each half-bar, and there are three brackets sharing the load equally. I think the bar would fail before the brackets did! We will still source some more for future use. I've also arranged for some professionally qualified riggers to inspect our work. Many thanks for your help!

Hi there, My apologies for intruding with what is probably a very basic question! I know there are lots of ways to hang bars from I-Beams but these are the ones we have - for safety, we want to add more of them to support the bars better and spread some extra weight that we are adding, so they need to be the same type & height. They grip the I-beam ledge on either side, with a metal bar underneath, a short length of screw rod hangs from that, then the bar clamp. I seem to have looked everywhere but I cannot find them. Link to a photo here (hope it works): My link Does anyone here know what these are called, and/or (ideally) where I could get them from? Many thanks in advance, Simon