I guess I am glad that my rebar cage, by my request shipped in advance
of the tower which hasn't shipped yet, has no hollow structure. It is
all rebar where it contacts the concrete with rectangular solid steel
pieces welded to thee three HD vertical rebar pieces which protrude
above the concrete foundation. These steel pieces are welded to the
vertical rebar and have 6 mounting holes in each to mate to the
triangular tower section used as a tilt fixture.
There just isn't any place in this rebar cage or tilt fixture design to
store water that could freeze and cause mischief as in many other designs.
Gene, your quote is well taken and beyond that buying from a
manufacturer whose designs just are not susceptible to certain problems
is likewise a good caveat.
Awaiting a Tashjian (ex Tri-Ex) DX70 with two each 1 hp motors for power
up/down and tilt.
Patrick NJ5G
On 1/29/2016 12:53 PM, Gene Smar wrote:
Patrick:
I recall a wise man once admonishing us, both here and in his book, "Up the Tower" (which my kids got me for Christmas and which I wish I would have bought before I constructed mine), " DO what the manufacturer says; DON'T do what he doesn't say." Caveat Amateur.
73 de
Gene Smar AD3F
On 01/29/16, Patrick Greenlee wrote:
What does the brain trust think about the idea of plugging the ID of
tower legs slightly above the top of the concrete foundation and
drilling a weep (drain) hole at the top of the plug. It would require
poking into that hole periodically to prevent insects or whatever from
plugging the hole but should eliminate the need for any concern or
proactive adding of pea gravel below the tower legs or acid soil eating
on the bottom of the legs.
Patrick NJ5G
On 1/29/2016 10:40 AM, Chris Wynn via TowerTalk wrote:
On my first Rohn 25 tower that I put up while in college, I had water get into
a leg and actually busted outwardly. It left about an inch and a half rip
looking seam. This occurred about 4 feet from the top of the concrete pad. I
could only imagine that there was some type of obstruction in the leg that
allowed water to build at that point. When it froze, the water expanded
outwardly, busting the leg.Regardless, the tower lasted throughout my college
career and until I later got married and moved out. I would imagine that my
father is still using that section to hold up one of his bird houses.I would
add that pea gravel as a way to drain any moisture, just in case....
Good luck
Sent from Yahoo Mail on Android
On Fri, Jan 29, 2016 at 8:51 AM, Larrylknain@nc.rr.com> wrote: I have always
put the pea gravel in the bottom as spec'd by Rohn. The way
the legs are constructed and assembled on G sections I suspect there is very
little water that gets in the legs. Probably more of an issue if the top
section is just another straight section and the ends are not capped in some
way. But I could imagine a very small amount of seepage perhaps through the
bolt connections and perhaps over time rusting out the bottom of a leg that
is sealed in concrete. Perhaps condensation in some environments could play
a role. The latter two seem awfully remote to me.
73, Larry W6NWS
-----Original Message-----
From: Larry Loen
Sent: Friday, January 29, 2016 7:17 AM
To: TowerTalk
Subject: [TowerTalk] Tower buried section legs -- Buried in Concrete orBelow
the Concrete?
The Rohn spec calls for the legs of the bottom section to be buried a few
inches in pea gravel below the concrete. My contractor suggests that as
long as the top is properly sealed, it's overkill and that overall, it's
better to encase the legs in concrete, protecting them from corrosion from
that rare day in Arizona that the water levels would reach the bottom of
the tower. He suggests that the tower will be adequately sealed on top.
Soil here is acidic enough that I've been advised not to let the tower
sections touch the ground for even the short time they are stored here
awaiting erection. Even if some got in over the years, rainwater is
presumably less acidic.
I don't try to innovate in these matters, but I wonder who is right here.
Thoughts?
Larry WO7R
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