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[Towertalk] Changing towers

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Subject: [Towertalk] Changing towers
From: (
Date: Fri, 27 Sep 2002 13:20:14 +0000
That could work; how much concrete does US Towers want?  
Do you need to permit the work?  If so, and even if not, 
I'd solicit advise from a structural engineer just to be 
safe.  If you do pour against the existing block, my 
recommedation would be to use a concrete epoxy bonding 
agent to fuse the two faces together.  Properly used, 
this stuff has a stronger bond than the concrete itself; 
you want to eliminate the cold joint. Hilti makes hammer 
and concrete coring drills and the epoxy joint material 
for the bolt holes.  Check out their website.  Phil  
> I put up a 40' free standing aluminum tower last last year, with a
> 2-element quad on top.  The tower was easy to walk up and seems to be
> exactly what was advertised.
> The problem is that, as the years have passed, I find I am no longer a
> climber --- even for a little 40' tower.  In retrospect, I should have gone
> for a crankup (with the lifting/tilting device, as well).  I am trying to
> estimate how much hassle there would be in changing towers.  My target
> would be the U.S. Towers  55', three-section crank up.
> I currently have about 2.75 yards of concrete in the ground, in an
> irregular 3 x 4' pattern, about 4-5' deep.  Could I use this as the base
> for the crankup?  I would cut off the current mounting leg connectors,
> drill fairly deep holes in the concrete and use construction epoxy to hold
> the new mounting bolts for the crank-up.  Should I pour more concrete next
> to the current mass (and maybe drill a few connecting rebar holes to link
> the two "pours" together)?
> Bill
> W2WO
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