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Drilling into granite 1
- Thread starter csd72
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civilperson
Structural
Why so deep? Why so large a diameter? Try 3/4" diameter HIT-TZ rods with 5 1/4" embedment. Holes made greater than half the thickness is how the quarries split out the granite from the face. See allowable and ultimate Steel strengths in HILTI 2006 Technical Guide. Use as many as needed for the total loading, (minimum spacing of 10").
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SlideRuleEra
Structural
As a bridge contractor we sometimes had to drill sizable, deep holes into granite (for explosive charges). Suggest forgetting about electric tools for what you are describing and go with a rotary-impact pneumatic drill (jackhammer) driven by a suitably sized air compressor.
Note: The impact-only tool that "the public" often refers to as a jackhammer, and is used for tearing up streets, etc., is actually a "pavement breaker" (in the US, anyway).
![[idea]](/data/assets/smilies/idea.gif "[idea] [idea]")
Note: The impact-only tool that "the public" often refers to as a jackhammer, and is used for tearing up streets, etc., is actually a "pavement breaker" (in the US, anyway).
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