If you are worried about that make sure that you pour your anchor concrete
to & above the surface. Galvanic action doesn't care what that metal rod is
attached to down there. If it is in the dirt it will get it.
At 03:12 PM 1/15/2006, k0dan wrote:
>Anthony...
>
>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 trees....total
>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
>Dan
>K0DAN
>
>
>----- Original Message -----
>From: "Anthony Brooks" <wm3t@wm3t.com>
>To: <towertalk@contesting.com>
>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
>are
> > in undisturbed soil, while the third is in soil that was disturbed when
>the
> > 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
>tribander
> > 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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>
>
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Jim Rhodes K0XU
jim@rhodesend.net
Experience is the thing you have left when everything else is gone.
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