[TowerTalk] Screw Anchor Experience

[Joe Subich, W4TV]

 > The Rohn concrete anchor rods are very heavy duty, but just in case I
 > slathered several coats of roofing tar on the portions of the rod
 > that were above the concrete block.

The alternative is to take a page from the bigger broadcast tower
installations and encase the guy rods in concrete.


73,

    ... Joe, W4TV


On 6/18/2013 9:13 PM, Dick Green WC1M wrote:
> Any anchor that's exposed to soil is at risk of corrosion. Anchors
> sunk in concrete are just as vulnerable because typically a good
> portion of the anchor rod is not in the concrete -- it's in contract
> with soil above the concrete footing. For example, Rohn spec calls
> for my anchor footings to be poured in a 6-foot long by 3-foot wide
> hole that's 4-feet deep. The concrete footings are only 18" deep, so
> there's about 2.5 feet of soil that the anchor rod is in contact
> with. Since the rod is set at an angle, probably 3-4 feet of the rod
> is in contact with soil above the footing.
>
> The Rohn concrete anchor rods are very heavy duty, but just in case I
> slathered several coats of roofing tar on the portions of the rod
> that were above the concrete block.
>
> Regardless of the type of anchor rod you have, it's a really good
> idea to inspect them every few years. That means digging down a bit
> to see if there's corrosion.
>
> 73, Dick WC1M
>