[TowerTalk] Anchor Bolts US Tower

[Grant Saviers]

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
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>