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SOP for overhead trussing?

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John Louis Griffin:
Hi all. I Am venturing into the market for school dances. I would like to know if there is a standard operating procedure for hanging trussing from a ceiling in a school gym. NOTE: I am NOT going to attempting to rig it myself. I AM NOT a professional rigger. that said i will be hiring a professional rigger.what i would like to know is how do i approach this task. How do i find/locate a quality rigger? google searches keep turning up results for crane operation riggers? what equipment should i buy or rent gig by gig in order to do this? Etc. Etc. Any Information would be incredibly useful.

Thanks In Advance,
JL Griffin
CEO of CG Entertainment

Doug Fowler:

--- Quote from: JL Griffin on August 25, 2011, 05:29:20 PM ---Hi all. I Am venturing into the market for school dances. I would like to know if there is a standard operating procedure for hanging trussing from a ceiling in a school gym. NOTE: I am NOT going to attempting to rig it myself. I AM NOT a professional rigger. that said i will be hiring a professional rigger.what i would like to know is how do i approach this task. How do i find/locate a quality rigger? google searches keep turning up results for crane operation riggers? what equipment should i buy or rent gig by gig in order to do this? Etc. Etc. Any Information would be incredibly useful.

Thanks In Advance,
JL Griffin
CEO of CG Entertainment

--- End quote ---

Where are you located?

Use the following link to find the nearest IATSE local.  They will hook you up with a rigger.  You will need a man lift to get to the gym steel.


http://www.iatse-intl.org/directory/search.asp

Brian Ehlers:
I'd like to ask a related question:

If no design or load ratings for the existing structure are known, how will (or should) the rigger approach the job?  How does a rigger evaluate whether or not the structure is adequate for the load to be suspended?  At what point does he call in a structural engineer before completing the rigging?

John Livings:

--- Quote from: Brian Ehlers on August 26, 2011, 12:55:02 PM ---I'd like to ask a related question:

If no design or load ratings for the existing structure are known, how will (or should) the rigger approach the job?  How does a rigger evaluate whether or not the structure is adequate for the load to be suspended?  At what point does he call in a structural engineer before completing the rigging?

--- End quote ---

Brian, The simple is answer is without a structural assessment you don't know.

The design load of the trusses or beams may already be exceeded. (everyone keeps adding equipment, AC and other heavy things)

It is possible an assessment has already been done (As far as hanging equipment) during the building planing stage of construction.

If it is an old school, that information may not be available.

A lot of things get "bootlegged" in without any problems, However I would recommend NEVER doing this or be part of doing this.

I really don't even know how many spaces we have worked in that someone opened up 2  or 3 spaces to create 1 large space.

They determined the "Partition" walls were "Non Bearing" and removed them only to find out that they removed  "Engineered Sheer" Walls.

This is how rectangles become parallelograms

Almost always more expensive to fix than to have done it correctly in the first place. (by a factor of 2X or 3X more).

Just my thoughts.

Regards,  John

To answer the OP question, I am guessing your goal is not to just hang a piece of truss.

What is the load that will be hung from the truss, Lights, Wires, Speakers???

The problem as I see it is not having someone (Structural Engineer)  with the Global  Picture putting all the pieces together.

John Louis Griffin:
@ John Livings

Well I  am trying to hang 2 trusses. 1 will be above the dj stand and will be a 16 foot segment of triangular trussing. from it will be suspended 20 custom built line arrays (10 on each side) 4 chauvet intimidator scanners and 2 chauvet min spots. then over the crowd i plan to suspend a circle of triangular trussing 18 feet in diameter and from it suspend 8 Chauvet Intimidator LED spots and 8 Chauvet COLORstrip Minis as well as 4 Chauvet Techno strobe LEDs and 4 Chauvet led shadow (Blacklight) panels. in the center of the circle will be a piece of x shaped trussing where each leg of the x is 2 feet long, and from it will be suspended an american dj Spherion Tri led.

Hope this helps,
JL Griffin

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