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Affixing screen to truss

Discussion in 'Scenery, Props, and Rigging' started by fredthe, Dec 28, 2018.

  1. fredthe

    fredthe Active Member

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    So I've got a temporary install that needs a 7.5'x10' FastFold screen, rigidly attached to a horizontal truss (see picture.) Everything I've seen on screens and trusses generally involved hanging, but to get everything at the correct height the screen needs to be centered on the truss. Any suggestions for how to attach it? It's only about 32 lbs, so not very heavy, but I need something the PSAV riggers will find acceptable.
     

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  2. BillConnerFASTC

    BillConnerFASTC Well-Known Member

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    I would be inclined to clip it (clamps) to the truss and then a off set "ring" at top that aligns with a lift line, truss to keep the crenn from rolling the truss at all. I would probably not be comfortable truss only attachment though if enough other weight on bottom of truss - several hundred pounds of lighting - it might be OK simply to brace it to upstage chords of truss.
     
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  3. egilson1

    egilson1 Well-Known Member Premium Member

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  4. fredthe

    fredthe Active Member

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    I was already considering something from the screen to the hoist chain to keep it from rolling the truss, though there will be close to 200 lbs of lights and speakers hanging form the bottom (I'd have more, but the venue only has 500 lb hang points). I guess to clarify my question, what specific clamps might you suggest for affixing the screen to the truss? I know some screen manufacturers design clips for this purpose, but DaLite isn't one of them. My LD suggested tie-wraps and, um, no.
     
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  5. RickR

    RickR Well-Known Member

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    I'm not a rigger but I think you need a high attachment point. 2 side pipes clampec to the truss, if needed a top cross pipe to reach the clamps.
     
  6. danTt

    danTt Well-Known Member

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    The lightsource clamps @egilson1 suggested will work if you can get away with a potential bulge where you are clamping the frame. Alternatively, assuming this is a fast-fold screen that is designed to have legs at times as well, I might look at fabricating a bracket that has holes to line up to the holes on the frame for the legs, and putting a few half couplers on this. Add a wire rope safety depending on the specifics of your usecase if necessary.

    Alternatively, in an indoor application I wouldn't feel too bad about zipties for positioning if you picked the screen from the bottom with cables for support and then held it in location with zipties or tieline. I think you might want a safety cable or too to prevent the screen from flopping over in the event that all plastic/rope attachments failed, but i think it could hold fairly well.
     
    Last edited: Dec 28, 2018
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  7. MNicolai

    MNicolai Well-Known Member Fight Leukemia

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    Are there going to be movers of any kind on the truss? If so, you may have issues with the screen swinging around.
     
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  8. fredthe

    fredthe Active Member

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    Thanks, that's what I was thinking, but I couldn't find an appropriate clamp. I'll look at those, though as danTd points out there might be a bulge issue.

    I was hoping to find something off-the-shelf, mostly because I won't have access to the screen frames to check alignment until the event (without extra effort, as I'm in Maryland and the screen and event are in Boston.)

    I was already planning on one safety on each side, around frame and truss. It's rigged high enough that even if the safeties slip to the top of the frame, it'll still be above head height if anyone's under it.

    Now that's an interesting idea! It would be simple to pre-fab the pick lines to the correct, matched, length. And yes, still safeties as backup.

    No movers. There were plans initially for moving mirror type, but then we found out about the 500 lb limits (which was not indicated on the venue drawing.)
     
  9. BillConnerFASTC

    BillConnerFASTC Well-Known Member

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    Load rated zip ties.

    This is very clean - some 1/8" wire rope from bottom of screen to truss and zip tie around mid point of screen to top of truss. It might rotate truss ever so slightly. Don't know if that would be a problem for your content.
     
  10. lwinters630

    lwinters630 Well-Known Member

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    Da Lite makes fly clamps check fullcompass
    Da-Lite 29641
    Fast-Fold NXT Fly Bracket Kit

    The fast fold has about 1 1/4 " square stock frame. You could use small rated chain or Blue water rope to wrap around it. Always check the rating first for your application. Use two 2 points about 6" in from each side. Run 1/4" shackle, thimble, 1/8 black wire rope up to truss.


    Fast fold weighs under 60 lbs.
     
    Last edited: Dec 29, 2018
  11. egilson1

    egilson1 Well-Known Member Premium Member

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    How about we not recommend using non-rated hardware for suspending something overhead? Even if it’s only 60 pounds. The need to use properly rated hardware when ever you are suspending anything overhead cannot be understated.
     
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  12. lwinters630

    lwinters630 Well-Known Member

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    I have edited the post to reflect rated hardware.
     
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  13. Mike Donovan

    Mike Donovan Member

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    Happy New Year!

    We fly screens on a regular basis during corporate season. We have fly kits that attach to our larger screens, but with our smaller screens, 9’x16’ and smaller, we rig right to the screen frame.

    We have these black ~3’ long webbing straight slings. I forget what they’re rated for off the top of my head, but their rating is plenty for screens. The sling has an eye in either end, so we choke it through itself around the top of the screen frame (or around the fly bar of our bigger screens), pass it around the chord of the Truss, and finish with a shackle. For a 7.5x10, we’d use 3 slings: centre, then one each a foot or so in from each edge. Then add a couple of safeties between the frame and truss.

    We also have some rated screw eye/trigger clamp assemblies that we normally use for our video wall. Sometimes we will clamp those to the Truss and shackle the sling to the eye. This then gives us some levelling options as the assembly can work similar to a turnbuckle.
     
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  14. Mike Donovan

    Mike Donovan Member

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    Sorry, I just reread your original post and saw that the screen is not hanging underneath the Truss.

    Rig the screen similar to a flat that is supported by bottom hangers: Build three points. Each point has a sling choked around the bottom piece of frame, a second sling choked around the Truss, and a piece of wire rope and shackles to get between the two. This will support the weight of the screen. Then make a lashing with slings or rope to secure the middle of the screen to the Truss so it doesn’t rotate forward.
     
  15. AVShowNC

    AVShowNC Member

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    Cable Gliders. They attach to aircraft cable and allow for adjustment. Use them all the time.

    A unique, self-locking, completely adjustable suspension device.

    • Instant and precise height adjustment along the length of aircraft cable
    • Gliders attach to steel cables using a unique 3 or 6 ball mechanism
    • Glider slides up and down the length of cable when depressing plunger
    • Locks solid when the plunger is released
    https://www.stageriggingwarehouse.c...tStraightCategory=Rigging Hardware&SBCatPage=
     
  16. danTt

    danTt Well-Known Member

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    The various versions of these are pretty neat, however it's really hard to find any that a) have any rating and b) are rated for overhead lifting. I've seen these fail in in impressive ways before if they are used improperly as well. Also, they will not work very well in this circumstance because the screen needs to hang above the truss, which even with completely adjustable picks is pretty hard to do with cable alone.
     
  17. kicknargel

    kicknargel Well-Known Member

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    I've shied away from rigging with nylon webbing because it won't stand up to fire or high heat. Too bad, because it's very convenient. But we've go to aircraft cable or chain.
     
  18. BillConnerFASTC

    BillConnerFASTC Well-Known Member

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    Just curious if you know of any incidents if these being an issue in an actual fire in an occupied building.
     
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  19. kicknargel

    kicknargel Well-Known Member

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    I don't. Just something I've heard from riggers time to time. In fact PSAV in-house crews (hotel ballrooms) have made me change nylon to steel rigging for this reason. (Not consistently.) So, it's one of those abundance of caution things.
     
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  20. RonHebbard

    RonHebbard Well-Known Member Premium Member

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    @BillConnerFASTC Are you asking about fires involving equipment suspended by nylon slings in an occupied facility?? If so, "Lettice and Lovage" featuring Dame Maggie Smith and Maggie Tyzack in Broadway's Music Box theatre in 1990 leaps to mind.
    Toodleoo!
    Ron Hebbard
     

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