[TowerTalk] Pier pin vs. burying in concrete

[Stan Stockton]

On Kurt's website he makes the following observation referring to a tower
that is mounted on a pier with the equivalent of a ball socket mount:

"Putting the tower on a free base connection has allowed us to increase the
antenna loads by 49%."

 I am interested in a practical means of achieving this type of free
rotating base. Will be out of town for 8 days, but will be interested to see
if someone has a good, practical way of achieving this.

I've got towers buried in concrete and ones on flat plates with a pin coming
out of the base. I prefer the ones that are on flat plates, for several
reasons.

Stan , K5GO


----- Original Message -----
From: "alsopb" <alsopb@gloryroad.net>
To: <towertalk@contesting.com>
Sent: Thursday, May 31, 2001 2:16 PM
Subject: Re: [TowerTalk] Pier pin vs. burying in concrete


> I have been following this thread and see only tangential references
> to the type of pier pin installations I've seen.
>
> First, they use a flat bottom plate on the concrete.  I doubt that
> these rotate at all to relieve the moment at the bottom.  Kurt's
> analysis looked at this and concluded it almost is equivalent to a
> burried installation.
>
> Second, I see no reference to the complicated rebar cage that one has
> to put in the hole to make up for the missing tower section.
>
> It appears that this type of "pier pin" base is the worst of both
> worlds.
>
> 73 de Brian/K3KO
>
> Hank Lonberg wrote:
>
> > With the pier pin base there is no moment developed at the base.
>
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for information on our fabulous Trylon Titan self-supporting towers - up to
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