Was hoping you could share guidance on whether it would be acceptable to use eposy to secure a 2-3\4" anchor rod into a 3" diameter core drilled hole at a depth of 19". All of the guidance or lage hole tech bulletins tend to max out at a core drilled hole size of 2-3\4 was simply curious if was considered acceptable to extrapolate up to higher sizes.
In image uploaded is current design of anchors installed in the apron of a dam, we are doing repairs and are developing contingencies incase one of those break during mainteance. IF one were to break, we would be looking at using a 3" core drill bit in order to drill down to the bottom and go around the nut on bottom, then would like to install a 2-3/4" threaded rod anchor bar and secure with epoxy.
Hi Kurt,
Hilti has performed supplemental testing for large diameter elements with HIT-RE 500 V3, with the largest tested threaded rod being 2 1/2" with a nominal hole diameter of 2 3/4". Therefore, engineering judgement would be required when utilizing a 2 3/4" threaded rod with HIT-RE 500 V3, and extrapolation of values would not be recommended. For more information, please reference the technical bulletin for large diameter elements with HIT-RE 500 V3 on Hilti's website.
For additional assistance, please reach out to hnatechnicalservices@hilti.com or give us a call at 877-749-6337.
Regards,
Matthew