Jim,
So what you are telling me is that it would be OK to use the $3 anchor bolts
for freestanding tower?
I guess I was overly pessimistic when I anchored my tower with 12 bolts into
granite and added guy wires to it. My calculations show that it should
withstand 130 mhp wind with 20 foot^2 on top. Could I take the guy wires off
maybe? It would make it a lot easier to haul up antennas that way.
Hans - N2JFS
-----Original Message-----
From: jimlux <jimlux@earthlink.net>
To: towertalk <towertalk@contesting.com>
Sent: Sat, Mar 24, 2018 11:38 am
Subject: Re: [TowerTalk] Achor bolts?
On 3/24/18 8:03 AM, David Robbins wrote:
> Well, it probably is... but how many per leg? And what are they attached to
> in the concrete??
And how big is the base of the tower. A tower that is 3 feet across has
1/3 the load of a tower that is 1 foot across.
A 400 foot tower that's 10 feet across with 40 bolts isn't putting a
huge load on any one bolt.
>
>
> The are claims in a discussion on Face Book that an anchor bolt, "5/8 in. x
> 12 in. Hot-Galvanized", is suitable for a free standing tower. Someone even
> claims it is used for a 400' freestanding tower. It doesn't make sense to me
> but I might be overly pessimistic.
>
> I hate to start lengthy discussions and this might be one of them so,
> please, comment only if you have a well grounded answer. I'm sure there are
> plenty of opinions about it like my own, but I would like to know if my guts
> feeling is right or wrong. What I am afraid of is that you can pull out an
> anchor bolt like that right out of curred concrete.
>
> 73 de,
>
> Hans - N2JFS
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