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RE: Footing Overturning in Rock

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Rich:

I don't see why you could not use some sort of epoxy (or other chemical)
system to "glue" in rebar into the rock that then could be cast into the
footing in some manner.  The only issue that I would think that would need
to be resolved is if there is any testing/evaluation of epoxy anchoring of
rebar into rock (and if so, what type of rock).  But, I have to believe
that there are such systems and that more than likely someone has an
evaluation report or some testing.  The biggest challenge may be drilling
the holes, depending on the type of rock.

Regards,

Scott
Adrian, MI


On Tue, 18 Jul 2006, Rich Lewis wrote:

> Joe,
>
>
>
> I'm not sure if you are kidding or serious.  How common are epoxy rock
> anchors?  I haven't seen them used before.  I have been to the Williams site
> http://www.williamsform.com/Ground_Anchors/ground_anchors.html and looked at
> their literature.  It seems to me that there are 2 possible ways of doing
> it.  One option is to predrill and use pigtails in the footing.  The other
> is to post install by drilling through the footing into the rock.
>
>
>
> I would think wedge anchors would be more reliable because you may not get a
> clean hole for the epoxy.  Plus, pumping equipment is needed.
>
>
>
> Any other thoughts on this would be appreciated.
>
>
>
> Rich
>
>
>
>
>
>
>
>   _____
>
> From: Joe Grill [mailto:jgrill(--nospam--at)swiaz.com]
> Sent: Tuesday, July 18, 2006 11:09 AM
> To: seaint(--nospam--at)seaint.org
> Subject: RE: Footing Overturning in Rock
>
>
>
> Using those pesky little anchors that we have been talking about the last
> couple of days.
>
>
>
> Joseph R. Grill, P.E. (Structural)
>
> Shephard - Wesnitzer, Inc.
>
> Civil Engineering and Surveying
>
>
>
>  <http://inet/index.htm>
>
> -----Original Message-----
> From: Rich Lewis [mailto:seaint03(--nospam--at)lewisengineering.com]
> Sent: Tuesday, July 18, 2006 9:02 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Footing Overturning in Rock
>
>
>
> I'm working on the design of a simple spread footing bearing on rock.   The
> overturning moment due to wind is large requiring a large footing to meet
> the 0.6*D + 1.0*W load combination.  I was wondering about possible
> techniques for engaging the rock to help resist overturning and uplift.  Is
> it feasible to anchor into the rock to do this?  Are there other methods to
> utilize the dead weight of the rock to help resist overturning?
>
>
>
> Thanks for your help.
>
>
>
> Rich
>
>
>
>

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