Ken the only advantage is the tower can be stacked up to the first guy
level without a need for temporary guys. Not a big deal but if working alone it
can save a lot of time.
73,
Gerald K5GW
In a message dated 1/29/2016 11:31:06 A.M. Central Standard Time,
k6mr@outlook.com writes:
Why do people insist on putting the first section in concrete? If you read
the K7NV analysis of guyed towers it is far better to use a pier pin base.
Less stress on the tower and the problem of rust and/or freezing damage to
the tower disappears. Rohn approved.
Seems like a win-win to me.
Ken K6MR
> To: towertalk@contesting.com
> From: patrick_g@windstream.net
> Date: Fri, 29 Jan 2016 10:55:49 -0600
> Subject: Re: [TowerTalk] Tower buried section legs -- Buried in Concrete
orBelow the Concrete?
>
> 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, Larry<lknain@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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> >
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> >
> >
> >
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