[RE-wrenches] Tying a ground mount to sandstone slab

[Ray Walters]

The ballasted idea is good, and I've also done what you are proposing 
below, which is a hybrid ballasted/ anchored system.   Epoxy is the best 
anchor I've ever used, just make sure the hole is really clean before 
putting in the glue.
Also I'd make the slab bigger to enhance the ballast effect.  I did a 
pole mount  on top of solid rock on a 4'x 4' x 16" thick slab with lots 
of rebar, and j bolts.  We then welded a bolt-on flange to the base of 
the pole to bolt to the j bolts.
You may want to talk to a structural engineer;  all of this is very 
calculable.  I use a simple 50 lb/ sq ft loading on the face of the 
array, and work everything back to tipping moment at the pivot point 
(either the base of the pole or the edge of the slab.)  You could even 
set the anchors and then use a crane scale and high lift jack to test 
the pull out strength of the anchors if you wanted to get anal. 
http://www.northerntool.com/shop/tools/product_120532_120532

Ray

On 12/23/2012 10:03 AM, Mac Lewis wrote:
> Hi Wrenches,
>
> I am working on a project right now where we need to figure out how to 
> put an 8kW ground mount on a property that is covered with a sandstone 
> slab.  Does anyone have any advice on how to do this?  My preliminary 
> idea is to drill down about 12" and epoxy rebar into the sandstone, 
> and pour a square pier about 2'x2'x2' on top that holds the upright 
> support in place.  Any thoughts or comments about this or ideas about 
> other ways to approach this are appreciated.
>
> Thanks in advance
>
>
>
> -- 
>
>
>
> Mac Lewis
>
> *
>
> "Yo solo sé que no sé nada." -Sócrates
>
> *
>
>
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