[TowerTalk] Rohn 45

[EZ Rhino]

Why not cut off the existing Rohn 25 and use a pier pin base for the new Rohn 45?  it would only require drilling one hole in the center and epoxying one bolt...pretty easy.  

Chris
KF7P





On Dec 25, 2013, at 15:40 , K7LXC at aol.com wrote:

> I want to remove a Rohn 25 that I have buried in the  cement. I want to 
reuse the  concrete base and attach Rohn 45 in its place.  I want to install 
about 28 feet of Rohn 45 with a small 6 meter array,4 antenna  but only 5 
elements each. The antenna  box will be about 24 feet by 24  feet. There will 
be about 18 square feet of wind load on the tower. Is this  possible? 
Should I did out the base and plant the 45 in the hole and re-cement?  Can holes 
be drilled down into the concrete and a base plate used for 45 be  attached 
using bolts and some type of epoxy?

   I wouldn't recommend removing and re-installing the  base - too much 
danged work plus the base should go into undisturbed earth per  previous 
concrete comments. While a base for 25 or 45 isn't really asked to do  much (it 
basically keeps the tower from sinking into the ground), for the  relatively 
little work to dig and pour the new concrete I'd opt for a new  hole and 
concrete.

   OTOH feel free to use the existing base for the new  45 base. If you 
don't have any rebar in the existing base, you just need  a rotary hammer to 
drill the new holes. If you run into some rebar, you'll  need a diamond 
coring bit. 

   The place where you rent the rotary hammer will  probably have the 
construction epoxy you'll need to anchor the new bolts. It's  2-part epoxy and 
you can get it at any hardware store. The cured epoxy is  stronger than the 
concrete so when it's hard, you're good to go! 

Cheers & GL,
Steve     K7LXC
TOWER TECH 

PS - What's a 24'x24' antenna box?
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