[TowerTalk] How to fix crooked Rohn 45G short base?

[Grant Saviers]

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.
>