I have seen anchor holes drilled with a machine that flares out the bottom 4 feet of the hole to make a tapered foot. I would think that would resist being pulled upwards pretty good.
From: Lewis Bergman Sent: Saturday, May 09, 2015 10:28 PM To: [email protected] Subject: Re: [AFMUG] sonnet tubes for guy wire ancors I have done this but the diameter was 30". At the end of the day you have to remember that normally the concrete is really there to adhere to our provide friction against the earth. Very few anchors actually have enough weight to counter the pull off the guys. The Rohn book should provide some guidance on caisson anchors and how deep they should be. Around here there are a lot of oil field service companies that will set what we call drill anchors for really cheap. They are the same thing as the anchors used for utility poles and typically have a pull rating in excess of 25,000 pounds. I would think that this would be your cheapest solution. On May 9, 2015 6:03 PM, "Brandon Yuchasz" <[email protected]> wrote: Anyone ever use sonnet tubes drilled into the ground and then poured full of concrete for guy wire anchor points? We have a 100’ rohn that we just purchased. Two anchors are solid but the third is anchored on the top of what could best be described as a stone and concrete pillar. The concrete is all weather beaten and falling apart and if I push hard I can move the entire pillar. It’s a hard location to get machinery into but I can get a drilling machine in for putting in tubes. It can do a 16” tube dia. Thoughts? Brandon
