[TowerTalk] Screw Anchor Experience

[Mark Robinson]

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