Answering one of my own questions:
I called UST and got through to Remi/Remy ?? the engineer. He said "the
flange bolts should be tightened as much as the average person can
tighten them with an average wrench".
Wow - more "weasel wording" per K7LXC.. they used to have a spec, but
withdrew it.
I probed a bit and he said that the design depends only on the shear
strength of the bolts, not the clamp friction. So, as long as the bolts
don't fall out they should withstand the base reaction forces.
I've torqued my flange bolts to 130 ft-lbs and that almost brings the
flanges into tight contact.
Grant KZ1W
On 10/12/2011 10:26 PM, Grant Saviers wrote:
> Just went through the same with a new UST HDX589, 4 bolts per leg and
> wasn't sure I could get even 1 bolt into the rear leg after raising,
> pivoting on the bottom bolts in the front.
>
> However, with some struggle by threading in the first bolt, it did go
> together but did lead me to look for an appropriate 1 1/2" "spud wrench"
> on ebay that has a long tapered tail for hole alignment. I did find
> that tightening the first bolt made it possible to get in bolt 2,
> tighten it and then bolt 3 etc.
>
> Now I'm searching for the proper torque value for these bolts (1"
> A325). My engineering calcs from UST have no callouts. The Portland
> Bolt torque chart says 1063 to 1271 ft-lbs (!!!) which is going to take
> one heck of a torque wrench and several NFL linebackers. What is really
> necessary?
>
> Another question is what should the base embedded rod nuts be torqued
> to? They are 1 1/8" A36 threaded rod. If tightening against a leveling
> nut perhaps the bolts specs are the target but would that be too high if
> tightening against the embedded rod?
>
> Grant KZ1W
>
>
>
> On 10/12/2011 9:27 PM, John Hudson wrote:
>> Ok this may be irrelevant but I had a old Triesto tower that was damaged and
>> I replaced it with a TX-455. The Triesto had 2 bolts in each leg, and when I
>> tilted it over I pivoted on the bottom bolts in the front legs
>>
>>
>>
>> Now on the TX-455 I installed it today and got the bottom bolts in the two
>> front legs in and raised it. Now the TX-455 has 3 bolts in each leg and the
>> other 2 holes did not align just perfect. As a matter of fact it was pretty
>> much a struggle to get the holes align.
>>
>>
>>
>> My question is I looked on line at some photos and looks like some use the
>> middle holes to pivot on. Does it matter with three holes? Does it make
>> alignment any easier? Was wondering if anyone else has this issue
>>
>>
>>
>> Thanks
>>
>>
>>
>> John
>>
>> KO4XJ
>>
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|