My experience with a new steel structure was quite different. All heavy
structural ("red iron") steel to steel bolts were tightened with a
torque wrench. In some cases to 200 ft-lbs for the A36 fasteners. It
took two guys and a big torque wrench. In fact a special inspection was
called out by the building permit. (King Cty, WA)
For the structure to footing embedded bolts, I think "snug" is the
appropriate description.
I hadn't seen the UST FAQ when my HDX589's went up so called the factory
and got the "snug" BS answer. Portland Bolt has torque specs for
different bolt grades, and the 589 leg to base bolts should be torqued
to over 600 ft-lbs. I stopped at 175 ft-lbs, which may qualify in UST
engineering terms as "super snug". It took several passes across each
leg set to get all bolts to that level. I checked them a month later
and all were essentially unchanged.
Grant KZ1W
On 9/4/2012 9:45 AM, Brad L. Tracey wrote:
I'm not going to get into the tower cable lubricate part of the
group with US Tower. But to answer Jim's comment about snug fit. As a
Commercial Contractor I build a lot of Pre-engineered building and the
manufactures (Butler, Metallic, ect) and all of them say the same thing
about their anchor bolts and bolts holding the buildings components together
and that is "turn of the nut method" or snug fit. Just meaning as tight as
you can get with a standard wrench with using bare hands. I know it sounds
silly but that is a very common practice in my line of work. Most of the
engineers I work with agree with it to. I'm not trying to act like I agree
with anything US Tower says or be rude to you but just wanted to let you
know.
Brad N3NRN
It would be nice if UST provided detailed instructions on how to
re-cable their towers. They insist you recable their
towers, but then wont provide the info. Check out their info on how much
torque required for both the anchor bolts +
leg bolts..... answer, snug fit. What kinda BS answer is that.
Jim VE7RF
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