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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