[TowerTalk] Re: Locating Tower Guy Points

[Didier Juges <didier@cox.net>]

I suggest you try to get a copy of the survey from when you bought the 
property. It should include references to landmarks that should still be 
there on the other side of the house. From there, you can draw your tower 
project on the same print and you can easily figure out where the anchor 
points should be, with respect to these landmarks.

Now, for such a large tower, you will certainly need a permit, in such a 
case the designer should do these calculations so the engineer can sign the 
drawings.

73,
Didier KO4BB

At 12:07 PM 12/22/2003, Bob Gates wrote:
> I'm perplexed.  And for those who know me, just shut up.  Am in the planning
> stages of installing a "really big tower".  At least it's larger than anything
> else I've put up.  The question is, how do you locate the positions of the guy
> wire base points when they are not on a direct line of sight with the tower
> base?
>
> For example, say I want to install 100' of Rohn 45/55.  These towers require
> fairly large anchor rod foundations.  Something in the neighborhood of 
> 3'x3'x4'
> and 6' deep.  Exact size is not an issue, but one would hopefully be able 
> to dig
> the holes and pour the concrete/rebar at the same time you pour the tower
> foundation.  But suppose one or more of the anchor points is on the other side
> of a structure, say a house.  You can sort of approximate the distance 
> from the
> tower by knowing the length of the guy wire and calculating the angle of the
> dangle with a temporary pole.  But the angle from the tower can't be 
> seen.  And
> they need to be 120 degrees apart.
>
> The only thing I can figure so far is to put in the tower foundation, wait a
> week or two, install 30' or so of tower, add some temporary guys, and then
> visually align where the anchor bolts need to be.  Then have the 
> contractor come
> back out and excavate/fabricate and install the anchor bolt foundations.  Then
> wait a week or two before installing the permanent guys and erecting the 
> rest of
> the tower.  Obviously you would want to do all of this in one trip vs. 
> two, but
> I can't for the life of me figure out how.
>
> Any advise from the experts would be most appreciated.
>
> Bob,  KG7KW


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