[SML] pipe grid question

[Dan Sheehan]

if you had one tested, and it was more than strong enough,
or in fact stronger than what you would replace it with,
would the PTB accept the original design / installation ?

On Mon, Oct 16, 2017 at 11:57 AM, Richard John Archer via Stagecraft <
stagecraft at theatrical.net> wrote:

> Last week I had some questions about our pipe grids here at Cornell.  You
> might remember we had half batten clamps and the CU engineers were not
> happy.   Well……..we bought some full batten clamps to replace the halfs but
> the holes didn’t line up.   We jury rigged something but when we finally
> took down the half clamp  …..it had no “makers” stamp or other info so we
> couldn’t tell who’s it was.   It was  close to if not 3/16 steel rathe than
> the 11 ga  (1/8”) Clancy makes theirs out of.,, as I mentioned, the holes
> don’t align with today’s Clancy clamp..the clamp steel above the pipe bend
> is longer,  there are two holes in the clamp above the pipe  for bolts to
> tighten the clamp around the pipe and a third hole for attaching it to
> whatever might be used to hang the clamp (in our case it is a clevis
> fitting on  threaded rod)
>
> Any body have any idea who might have made this beam clamp?   There are no
> markings on the cross grid connectors either.    Building was built
> 1986-88.    Clamp looks much more robust than present JR Clancy 1/2 clamp
> so we are wondering if it has a higher load rating.   We’d certainly like
> to avoid replacing all these clamps in this and our  five other spaces with
> fixed grids.  Present day Clancy clamps have load ratings stamped in.  H&H
> clamps have manufacturer stamp (but no load rating)
>
>
> DickA
> TD, Cornell U
>
>
>
> > On Oct 9, 2017, at 11:56 AM, Richard John Archer via Stagecraft <
> stagecraft at theatrical.net> wrote:
> >
> >
> > University engineers are looking at the pipe grids in our spaces (not
> yet in the proscenium)  .   Seems like an odd time after 30 years in the
> building ….but…
> >
> > Grids are all  kind of typical looking …..two way #40  1 1/2” pipe grid
> ,  cross grid connectors (so one direction of pipe below the other
> direction) ,  a bit over 4’ x 4’ spacing….beam clamps with 1/2” threaded
> rod seemingly  spaced appropriately  The problem is with the  pipe
> clamps….most appear to be JP Clancy   half pipe clamps (or other
> manufacturer? Clancy did Proscenium rigging).  Half pipe clamps only have a
> 200 # RWL  .  Why would anyone install these in a grid?  ….they just
> adequately  hold up the pipe weight.    Am I missing something here?    Was
> this some Cornell value engineering at it’s finest?  I’m sure original
> theatre consultants wouldn’t have spec’ed this (ARTEC)
> >
> > Needless to say, we’ve been hanging  up to maybe 200 fixtures in there
> for years.  Biggest flexible space is about 50 x 50.
> >
> >
> >
> > DickA
> > TD, Cornell U
> > ____________________________________________________________
>
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-- 
...Dan Sheehan
Fixer of things that break
Saddleback,Maine has been sold: http://bit.ly/2ui3EsC
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