Doweling to Rock

[jike]

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.

 

[flamby]

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.

 

[frogit22]

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.

 

[little49]

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.

http://www.williamsform.com