doweling to rock

huangyhg

doweling to rock
when pouring a building footing on bedrock sloping more than a specified amount, it is common to dowel the footing to rock to prevent sliding.  
how are the dowels normally installed:
drilled and driven into rock
drilled and grouted into rock
drilled and epoxied into rock
please note that there is no uplift.
one interesting thing i have seen in hydropower projects is to drill a larger hole, fill with grout and stab the dowel into it. epoxy is costly so everyone avoids that saving for very critical applications like mounting a crane or winch on overhead rock in tunnels.
ciao.
epoxy or adhesives is not terribly expensive and is probably the most contractor friendly option.  
call a supplier's product engineer such as hilti or dywidag for help specifying their product.
i recently did a foundation design that was bearing on shallow bedrock. the contractor requested a revision to the footings to avoid excavating large amounts of rock and i ended up using rock anchors. i went through william's engineering that specialized in anchoring systems. their website it extremely helpful and has  a variety of different solutions depending on your situation. the engineers that work for them are also very helpful in helping you choose the most economical and reliable system.