Is there a North-Seeking Plastic Owl here yet?
Hans - N2JFS
-----Original Message-----
From: Gene Fuller <w2lu@rochester.rr.com>
To: Steve Maki <lists@oakcom.org>; towertalk <towertalk@contesting.com>
Sent: Sat, Jun 22, 2013 11:17 am
Subject: Re: [TowerTalk] Fwd: Fwd: Fwd: Screw Anchor Experience
I couldn't resist this but, -
Haven't we more than beaten the "Screw Anchor" subject into the ground.
Gene / W2LU
----- Original Message -----
From: "Steve Maki" <lists@oakcom.org>
To: "towertalk" <towertalk@contesting.com>
Sent: Saturday, June 22, 2013 9:46 AM
Subject: Re: [TowerTalk] Fwd: Fwd: Fwd: Screw Anchor Experience
> On 6/22/2013 9:35 AM, I wrote:
>
>> According to Anchor Guard, an anchor even all by itself can act as a
>> corrosion cell:
>>
>> "Basic Anchor Support Design Example 1. Figure 6 shows the basic design
>> of a typical anchor support. The anchor support has all the necessary
>> elements of a corrosion cell. The shaft itself acts as both anode and
>> cathode as well as the electrical path between the two. The concrete and
>> soil act as dissimilar electrolytes. The soil has less oxygen just above
>> the concrete anchorage and consequently, less resistivity. The
>> electrical path is the shortest between the anode and the cathode at the
>> same point as the oxygen deficient soil, thus the deteriorating action
>> of corrosion is most strongly in effect in this area. Experience has
>> shown that this is the area most likely to deteriorate and cause the
>> tower to fail."
>
> One should note of course that Anchor Guard is in the business of
> selling anchor protection.
>
> But it would seem that a prudent design would include insulation from
> the tower AND total encasement in concrete below ground level.
>
> -Steve K8LX
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