S.E. neil moore and associates shingle springs,
At 11:31 PM 5/16/2001 -0600, raul labbe wrote:
I am working in a
design job, including foundations in an area with a shallow rock
layer. Some of the structures to be supported involve high piers, to
be properly secured against lateral forces and overturning, arising
from wind and earthquakes. Instead of rock excavation to allow
for big footings working as counterweights, we are considering the
option of anchoring in the rock, reducing both, expensive rock
excavation and the volume of concrete. The anchors would be grout
If anybody could help, we are looking for some
hint regarding the following : minimum spacing of the anchors,
"skin friction" or allowable bonding to be considered in
the rock, for determining anchor capacity and the required length.
Any special consideration if bundle bars are used. Information about
some SPECS to be got on line will be appreciated.