[TowerTalk] Tower foundation and bedrock

[Glenn Pritchard]

We do this at times here on Vancouver island in certain areas where you
have unforeseen weather patterns. Actually, Trylon has recommendations for
guying SST's such as mounting in shale, mountains tops with bedrock etc. We
have never had one fail because of structural fatigue or with the use of
guy lines.
Torque bars are used at times and we will actually be using a guyed SST at
an area called Klemtu BC next month.

Glenn, VA7UO

On Fri, Apr 12, 2019 at 1:50 PM <john at kk9a.com> wrote:

> Adding guys to a self supporting (not crank-up) tower comes up every now
> and
> then on towertalk. I do not have an engineering background however I also
> do
> not see the harm if properly done. Adding just a single guy set to the top
> of the tower would not be properly done, in my opinion. The lower sections
> of a self supporting tower are probably heavier and stronger than a guyed
> tower.
>
> John KK9A
>
> Steve k7lxc wrote:
>
>     I don't have a problem with guying a self-supporting tower IF the guys
> have very little tension on them (less than 40 or so pounds). Tower
> strength
> comes from the legs - the more tension you put on the guy wires, the more
> compression you put on the legs thus decreasing the capacity of the legs to
> support the tower. With a small amount of tension, you're not trying to
> hold
> up the tower - just restrain it from wind forces. With little or no
> tension,
> you could be subject to wind slamming - a violent and potentially fatal
> condition.
>
> >  I don't know where this misnomer comes from that a self-supported should
> be weaker if you added guy wires. Maybe somebody can tell me. I understand
> if the guy wires have a very steep angle the load on the tower will
> increase
> but that is not the case with mine.
>     It's not weaker - it just has potentially less capacity.
>
> Cheers,Steve     K7LXCTOWER TECH -Professional tower services for amateur
> and commercial
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>