Fw: [TowerTalk] Concrete anchors

[Bryan]

Thats one spec I havent seen.  Just how much force the tower can handle in a
straight down direction.  The tower is designed to go to 200' though.  I would
not think that the extra force from another set of guys would be enough to cause
the tower to collapse. As far as twisting goes, it would be interesting to see
which tower moved more..

I do already have everything, I also already have the base set :/.  So thats why
I'm trying to make it work..

On a completely different note, someone using Outlook express please tell me how
to fix my sentence wrap problem.  :)

Bryan


----- Original Message ----- 
From: "Pete Smith" <n4zr at contesting.com>
To: "Bryan" <bryanponder at sbcglobal.net>
Sent: Friday, September 17, 2004 5:56 PM
Subject: Re: Fw: [TowerTalk] Concrete anchors


> At 06:40 PM 9/17/2004, you wrote:
> >I completely understand your points.  Definitely points I have been
> >considering.
> >My idea in my thinking was that having the extra guy set would increase the
> >overall strength of the tower also increasing the wind load it could handle.
> >For this tower to fall it would have to snap 8 guys on the way down..  My
> >other
> >concern is that the 2 sets of guys would be attached to 1 hook on the guy
> >bracket.  If I'm to go with the idea of using a elevated guy anchor, would
> >this
> >need to be done on all 3 sides or just the side that has the shorter
distance?
> >What size post or I-beam is recommended.  How deep do I bury it, and do I
need
> >to put it in at a 45 deg angle?
>
>
> There are some problems with this.  The most likely failure scenario would
> have the tower collapsing with no guy wires broken at all, either because
> of torsion or compression on the tower itself.  In fact, it is almost
> certain that given where you can put your guy anchors, the tower will fail
> well before the guy wires.
>
> Work through the geometry of it -- an 8-10 foot high guy anchor will not
> improve the angle of the guys enough to give you nearly what you need for
> 120 feet of tower, which would be a 100-foot circle around the tower base.
>
> My sincere advice would be to look at a self-supporting tower.  You can get
> Trylon or AN designs that will get you close to 100 feet with no guys and
> reasonable antenna capacity.  The cost of the tower and the extra concrete
> for the base will be more than offset by the cost of the measures you are
> proposing for elevated guy anchors, plus you will not have to deal with
> your neighbors worrying over guy anchors that are "that" close to the
> property line.  If you already have the Rohn 25, sell it to someone who has
> a large-enough piece of property.
>
>
> 73, Pete N4ZR
> The World HF Contest Station Database
> has just been updated
> 2853 contest stations at
> www.pvrc.org/WCSD/WCSDsearch.htm
>