Towertalk
[Top] [All Lists]

Re: [TowerTalk] Fwd: Screw Anchor Experience

Subject: Re: [TowerTalk] Fwd: Screw Anchor Experience
From: Chris <EZRhino@fastmovers.biz>
Date: Thu, 20 Jun 2013 10:46:58 -0600
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
If they make fiberglass guy lines, why can't they make fiberglass anchors?

Chris
KF7p








On Jun 20, 2013, at 10:38 AM, Hans Hammarquist wrote:

> What I have seen, it is only the portion closest to the surface that 
> corrodes. I have found iron pieces buried for hundred of years with only 
> slight corrosion. Scrap iron, stored laying on the ground, has almost 
> disappeared in no time. I believe it is a combination of water, "dirt", and 
> air that is causing this.
> 
> 
> When installing fence with steel poles, a concrete "plate" is made around the 
> pole just at the surface. It is sloped on the top to allow water run-off. If 
> you don't do that the pole will corrode at the surface and eventually break 
> there.
> 
> 
> The rebar in concrete is "protected" by the concrete but will corrode if too 
> close to the surface. In the same way the fence pole is "protected" by the 
> concrete plate.
> 
> 
> Maybe some concrete poured around anchor can extend the life-expectancy of 
> the anchor.
> 
> 
> Next: What method or how would you inspect an anchor for corrosion damages? 
> Just digging around it?
> 
> 
> Hans - N2JFS
> 
> 
> 
> -----Original Message-----
> From: Mark Robinson <markrob@mindspring.com>
> To: Jim Thomson <jim.thom@telus.net>; towertalk <towertalk@contesting.com>
> Sent: Thu, Jun 20, 2013 11:36 am
> Subject: Re: [TowerTalk] Screw Anchor Experience
> 
> 
> 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
> 
> 
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
> 
> 
> 
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

<Prev in Thread] Current Thread [Next in Thread>