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Re: [TowerTalk] Screw Anchor Question

To: "Anthony Brooks" <>, <>
Subject: Re: [TowerTalk] Screw Anchor Question
From: "k0dan" <>
Date: Sun, 15 Jan 2006 15:12:41 -0600
List-post: <>

Sorry I can't address your question about soil compaction for your anchors,
but since you're concerned about their performance, you may also want to
look into the corrosive qualities of your soil. About 20 years ago I put up
a 70' guyed structure, with 4' screw anchors in Missouri clay soil. Good
anchor. However, 15 years later, the galvanizing and steel in the anchor
shaft had deteriorated to the point that one anchor failed during a 50 MPH
wind storm (it had previously survived MUCH higher winds, ice, etc.),
sligshotting the entire tower with antennas into some nearby
destruction! It was bad. Fortunately, no injuries or other property damage.
After the debris was removed, I dug up the remnants of the failed anchor and
the steel guy anchor rod was about the diameter of a pencil! Galvanic
action, over the years, had eaten it away. If I had it to do over again, I
would anchor them in concrete, not soil.

Hope you find a solution to your soil compaction, and that your soil turns
out to be nonreactive!

Good luck and 73

----- Original Message -----
From: "Anthony Brooks" <>
To: <>
Sent: Sunday, January 15, 2006 12:20 PM
Subject: [TowerTalk] Screw Anchor Question

> My tower project is starting to come together, but I have a concern that
> came about while installing the screw anchors today.  Two of the anchors
> in undisturbed soil, while the third is in soil that was disturbed when
> house was built.  The soil was used to build up the backyard of the house
> about 8 months ago.  What prompted the following question was that one
> anchor went in CONSIDERABLY easier than the other two.  The tower is a
> planned 70 foot Rohn 25 installation with two sets of guys with a
> and 2 element 40 on top. The anchor is on the downwind side of the
> predominate wind here.
> How long before disturbed soil is considered undisturbed?  I am concerned
> that the anchor in question may pull out due to the soil it was installed
> in.  Are there any recommendations as to what I can do to improve this
> anchor and in turn make me sleep better at night after the tower is up?
> 73 and thanks.
> Anthony, WM3T
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