I've made joiners and bottom plates for different tower sections for
Field Day, R25 to aluminum etc.
The Rohn leg bolts hold in shear so larger holes are not a good answer.
Getting two plates made with welded on pin and socket, that can be
shimmed to correct the angle makes sense as a solution, but needs a lot
of strength as you noted. I would go with the shimmed plates. Have
them galvanized.
For starting over, there are expanding grouts (Dexpan) that break up
concrete. Drill deep holes, mix and pour. Removing concrete with
rebar/tower section will be a PITA. A big excavator might pull it
straight out whole. I'd try that first. Or Dexpan to break off the
exterior then pull.
Grant KZ1W
On 7/4/2020 06:46, Blake Sobiloff via TowerTalk wrote:
Hi guys,
Due to the property lines and terrain I don’t have room to pour another one
next to the existing one, so jackhammering out the current one may be the only option.
Some others have suggested drilling new bolt holes to make the first section plumb.
That seems like the easiest option, but I worry that (depending on how close the new
holes are to the existing holes) that will weaken the tower right where the majority
of the bending stress is focused. I admit I’m naive about these things, though.
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