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Re: [TowerTalk] Rohn 25G

To: Rex Turvin <turvin2009@yahoo.com>
Subject: Re: [TowerTalk] Rohn 25G
From: Grant Saviers <grants2@pacbell.net>
Date: Mon, 19 Aug 2013 04:58:28 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Check out the finite element analysis that Kurt K7NV has on his web site re pier pin and solid guyed towers. it is quite instructive about the advantage of pier pins - they can handle higher loads than the "legs in concrete" for guyed structures. Also, if using Phillystran for some guys, there are some very important conclusions.

http://k7nv.com/notebook/towerstudy/towerstudy1.html

Grant KZ1W

On 8/18/2013 4:09 PM, Rex Turvin wrote:
I am using a pier pin base because that is what my county requires. When 
looking at Rohn's manuals and drawings a tower section buried in the concrete 
is used for a self supporting tower max height 40'. Rohns manual for guyed 
towers only shows a pier pin base, therefore the county will not allow me to 
use the tower section in the base. I argued that the foindation was stronger 
but a no go. I must use what the county will sign off on.
73 NR6M

ex: KF7NMD


Sincerely,


Rex Turvin
www.nr6m.com



________________________________
  From: Ray Benny <rayn6vr@cableone.net>
To: Mark Robinson <markrob@mindspring.com>
Cc: turvin2009@yahoo.com
Sent: Sunday, August 18, 2013 1:54 PM
Subject: Re: [TowerTalk] Rohn 25G

Rex,

I am wondering why you are using the pier base? I believe that unless you are 
going really high it not necessary. In most installations that I have heard or 
know of, the guys just bury a 4 - 5 ft piece of Rohn 26G in concrete and build 
from there.

Ray,
N6VR


On Sun, Aug 18, 2013 at 1:48 PM, Mark Robinson <markrob@mindspring.com> wrote:

I thought Rohn 25 should be guyed every 20 feet. If you are not using a wall 
bracket then I would install 3 sets of guys.
Mark N1UK

----- Original Message ----- From: <K7LXC@aol.com>
To: <towertalk@contesting.com>; <turvin2009@yahoo.com>
Sent: Sunday, 18 August, 2013 1:58 PM
Subject: Re: [TowerTalk] Rohn 25G




  I am a newbie. I am putting up a 60' Rohn 25G with 2 sets  of guys.
  My question concerns the baseplate. The baseplate only  uses a pier pin
to hold it in place. It seems to me that this would allow the  base plate to
move.

    Where would it move to?

    Pier pins are typically used with bigger, heavier  towers because it
more or less equalizes the leg stresses. In your case I'd  suggest just
burying some of the bottom section in concrete. It's much easier to  erect with
the bottom section locked in. With a pier pin, you'll have to use temporary
guying to get it erected.

    If your base is already poured, I'd recommend  bolting the baseplate to
the base. (Use a rotary hammer and epoxy to set the  bolts.)

     For a newbie, I don't recommend messing with  temporary guys. You need
solid rigging skills and the right equipment to do that  safely. And people
still get hurt by using them. Set it in concrete.



  The 1st set of guys wires go at 28'
What is the safest method  for installing the 10' sections prior to having
the 1st set of guys in place? I  am not using a crane. I am using a gin
pole. I want to make sure that it does  not fall over while I am the process of
getting to the height of where the 1st  guys go.

    See comments above. If you're going to proceed with  temporary guys,
use some of your precut guys for temps since ropes are stretchy.  A comealong,
guy grip, nylon slings and some carabiners or shackles will be very
useful. ALL of this is covered in my UP THE TOWER book which I strongly suggest
you read. (Available from _www.championradio.com_
(http://www.championradio.com) )

Cheers,
Steve      K7LXC
TOWER TECH
and
Champion Radio Products
Cell: 206-890-4188
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