[TowerTalk] Anchor Bolt Material

[Martin A Flynn]

Marv,
I reached out to our PE and explained your situation.   His reply was to 
suggest that you retain the services of a local PE (stating the obvious 
and CYA)

He did mention that he was involved in a monopole project that was in 
the same situation you are in. (they could  not replace the foundation 
or the pole due to zoning issues, but had to upgrade the anchor bolts 
for wind speed ratings.

They had inserts machined internally threaded to accept the anchor 
bolts, with grooves cut in the exterior to increase the surface area for 
the epoxy.   The gap between the insert and the hole was thus reduced to 
less then .125 for the widest part of the insert.

Visually, he said they looked like a section of swimming pool or vacuum 
cleaner hose.

73 Martin Flynn
W2RWJ


On 10/15/2014 12:00 AM, Marv Shelton wrote:
> I asked a PE at work and since the holes are so much bigger than the bolt. ( the holes are 2.5" diameter, the bolts only 1.125") he said the rated strength of the epoxy is only good if the hole is no more than a half inch bigger in diameter than the bolt. I confirmed this by talking to one of the epoxy product manufacturers.
>
> Sent from my iPad
> And YES it's cool!
>