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Re: [TowerTalk] Screw Anchor Experience

To: "Jim Thomson" <jim.thom@telus.net>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] Screw Anchor Experience
From: "Mark Robinson" <markrob@mindspring.com>
Date: Thu, 20 Jun 2013 11:05:58 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Jim wrote


## why mess with screw in anchors ? Only power company’s + telco’s use em. Even then they use eggs in the EHS guys. A 40’ tall utlility pole is already 6 feet into the ground. No
anodes used.

## The rohn type rod anchors are in contact with the soil, where it is trenched, so that portion of the rod needs to be coated with roofing tar pitch. Those GAC series anchor rods involve excavating a huge hole, that is then trenched. The concrete slab needs to be poured, then the
entire mess is bakfilled with dirt.


I reply...

They weren't screw anchors. They were the Rohn supplied anchors set in concrete per the Rohn specifcations (as you describee) BUT they are still vulnerable to corrosion. I have read dubious accounts of using tar on the buried metal parts - the tar can fail and then the corrosion will be concentrated in the failed areas

My opinion/guess is that the sacrificial anodes are a better way to go but only time will prove me right or wrong.



Mark N1UK


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