[TowerTalk] Fwd: Fwd: Fwd: Screw Anchor Experience

[Gene Fuller]

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 at oakcom.org>
To: "towertalk" <towertalk at 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
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk