What one of my previous employers did was to install a beam clamp
upside-down. The problem with installing on the bottom of the Z is
that it puts an unexpected torque on the purlin and I'm not sure it
is designed to take it, especially at 5x the wt + 250#.
At 09:13 AM 9/28/2007, you wrote:
For many years fitters bent the lip of Z-purlins with a crescent wrench and
installed small mouth beam clamps. The buildings never fell from this
technique to my knowledge even thought this is not correct. Recently we
hired a fitter that had work for some of our competitors in the past and
evidently they still bend the lips because that is what he started to do
before we caught him.
We have used large mouth beam clamps and the purlin hangers which are huge
and very expensive. We have only had one job in which the large mouth beam
clamps were a problem. We do NOT bend the lip anymore and haven't for 12
years or so.
We have used the screws installed on the vertical and it seemed to take a
lot longer to install the pipe. Maybe the screws are better than they used
to be.
Greg
Living Water Fire Protection, LLC
1160 McKenzie Road
Cantonment, FL 32533
850-937-1850
Fax: 850-937-1852
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Duross
Sent: Thursday, September 27, 2007 5:38 PM
To: [email protected]
Subject: RE: Pipe clamps on Z purlins
The first steel building I ever did I used a Michigan cast iron Z purlin
hanger that had a lock bolt like a top beam and it slipped right on the
bottom of the purlin, even had the angle of the lip of the purlin cast into
it. Worked well but they were $$, only came in 3/8", the rod stays
perpendicular to the roof slope. I used sammy express hangers on one too,
upper lip of the purlin under the roofing, again only 3/8". They were ok
too. I haven't used the swivels but I would guess they go on the upper lip
as well? I was told (when we were installing angle for the 1/2" rood
hangers) not to drill the vertical of the purlin. These engineered steel
buildings are strange animals.
Tom Duross
GRS
FGOL
Besides the Erico and Sammy products, Tolco has a universal swivel the you
can install on most rod-type clamps and anchors that allows the load to
hang plumb even if the attachment is sloped.
Steve Leyton
Away from the office - sent from my BlackBerry
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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