Galvy in Concrete Was:aluminum in concrete [RE-wrenches]

[Tom Simko]

 It may be possible for a pipe to rotate under uneven loading, unlikely but
possible. A piece of rebar through the pipe, a chunk of scrap angle iron
welded on, or cutting a hole with a torch in the sidewall will all for sure
eliminate any concerns.
 On this whole steel in concrete subject, I pulled a sign last month that
had been in the ground for 14 years, 2" plain old square tube steel, using
my load indicator equipped boom truck. The sign weighed 600 lbs, it had two
legs going into hand dug holes (fence post size) about 30" deep with maybe 3
bags of concrete mix being used per hole. It took well over 3800 lbs of
vertical pull for the sign to move, and that was only after soaking the
ground around it! The sign guys call it ground adhesion I believe, results
would vary with soil types, this was dirt with some small rocks, and very
dry. The square tube was not pierced with rebar or anything else and the
steel was in great shape from what I could see as the concrete stayed with
the steel. Tough stuff.

Tom Simko
Skyline Solar  

on 11/5/03 5:02 AM, Dan Whigham, SC Solar at DWhigham at scsolar.com wrote:

> William,
> 
> On tracker installations, we usually coat our pipe with a spray on rubber
> product used for the under side of cars. It has worked very well and is
> available at NAPA Auto parts.
> 
> Best Regards,
> 
> Dan Whigham
> SC Solar
> www.scsolar.com
> 803-802-5522
> 
> 
> ----- Original Message -----
> From: "William Miller" <wrmiller at slonet.org>
> To: <RE-wrenches at topica.com>
> Sent: Wednesday, November 05, 2003 12:52 AM
> Subject: RE: Galvy in Concrete Was:aluminum in concrete [RE-wrenches]
> 
> 
>> Friends:
>> 
>> I've noticed that one tracker manufacturer or another recommends a section
>> of re-bar through the bottom of a pipe mast. I always assumed this was
>> intended to keep the mast from loosening in the concrete and rotating
> under
>> heavy wind loads.   Is this possible?  If I sleeve my masts, or wrap them
>> in foam sheets or vinyl, are they more likely to rotate?  Should I cap the
>> bottom of the pipe so no concrete to steel contact is posssible?
>> 
>> (These are rhetorical questions.  There would have to be strong evidence
> of
>> a problem before I would change practices that are tried and true, not
> just
>> by myself, but apparently by many others on this list.  I feel that
>> galvanized steel in concrete is a good practice.  I've seen it extensively
>> in RE and communications for structural uses.)
>> 
>> William Miller
>> 
>> 
>> __________________________________________________________________
>> William Miller
>> Miller Power and Communications
>> PO Box 50, Santa Margarita, CA 93453
>> Voice :805-438-5600     Fax: 805-438-4607
>> email: wrmiller at slonet.org
>> http://millerpowerandcomm.com
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