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This does not specifically address drilled piers but its a start. ACI Committee 309, “Guide for Consolidation of Concrete (ACI 309R-05),” American Concrete Institute, Farmington Hills, MI, 2005, p. 19.

A Contractor of mine poured the first 25 feet of a 3' dia 30' drilled pier foundation designed to support a steel lattice transmission structure before he realized the foundation was off by the correct drilling location by about a foot. Construction halted and the top 5' haven't been poured and...

I have an issue with an existing tower built in the 70's. The foundation has some severe spalling (don't know if thats a good word, but its what we call it around here...i.e. flaking deterioration of the concrete) likely due to poor air content in the mix. I have cored the foundations and...

So I'm fresh out of school and learning the transmission trade. My boss is on vacation. I'd like to come up with a solution before he gets back. I've been working on a project where a 115KV line on H structures must go under a 161 KV line and then over a bridge at a 90 degree angle and 40'...

2.3160 lbs/ft for copper 750 mcm (kCMIL). Enjoy

forgot to put in the link sorryhttp://files.engineering.com/getfile.aspx?folder=1a462fea-3e78-486b-8ca0-8c7261f78daa&file=Breakout_Calcs

One of my Co-workers checked my calculations and brought up some points that had us scratching our heads. hef I took this value to be 4.75 according to Hilti's recomendation. But in the field the anchor is much longer closer to 8 in. What assumption is hilti making to limit the effective...

That makes things much more clear and much easier. Ya'll are a huge help. Once I understood how the symbols were written its a piece of cake. I have figured out a way to solve my problem.

I am digging through the ACI code D.5.2.1 (Concrete breakout strength) to see if a group of anchors can handle a massive 40K force. The answer is probably not, but I am having difficulty decipering the Ncbg formula to prove it. It looks somthing like this Ncbg= (Anc/Anco) (Psi ec), N (psi ed)...