Coring Hole in PT Slab

[NFExp]

I have a client that needs to core a hole in an existing PT slab. X-rays have been done and the tendons have been located. The new 6" hole will be 4" away from the tendon. From the articles I have read, it seems that the new hole will be acceptable. My question is there a specific code section that I can refer to?

FYI, the hole is not near a column or within 18" of the anchorage.

 

[Ingenuity]

I don't think you will find any code provision that gives you any acceptance or guidance, other than effects of holes/penetration on say punching shear capacity for flat plates, but you said you were away from columns so you should be good to go.

I typically like to stay away from PT anchorage zones by 36" - be it coring or concrete chipping. I encroach on this zone with caution.

Based upon my past (sometimes bad!) experiences, it is important that the crew doing the coring know where to place the core hole based upon the ACTUAL scan markout/results from the scan crew. Many, many times this is the step that gets screwed up and tendons get hit.

 

[ShawThing]

Small pilot holes prior to the core hole could be a good idea and another means of confirming avoidance of tendons.