Amen brother! Most of us would not have given this any thought at all.
Tower sections are not totally and completely rigid structures. They can and
will conform to the guy stresses.
73,
Gerald K5GW
In a message dated 2/12/2016 1:50:22 P.M. Central Standard Time,
w3ea@hotmail.com writes:
WOW .... this is getting over thought IMO.. it's a 40 ft/ tower not a
watch
with one level of guys.... PUT it up attach the guys and adjust there
tension to plumb the tower
install the top section ( I am assuming your attaching the guys @ the 30'
level )
install the last section antennas ect and HAVE FUN
Wayne W3EA
> To: towertalk@contesting.com
> From: lists@oakcom.org
> Date: Thu, 11 Feb 2016 23:43:06 -0500
> Subject: Re: [TowerTalk] My first tower section is not plumb...
>
> Douglas,
>
> Oh boy, at the risk of getting all the engineers and lawyers and
> would-be's in a dander, I'll suggest this - with the caveats that I
> don't really know what kind of tower sections you have other than your
> description that it's equivalent to Rohn 25. And I don't know whether
> you have an informed inherent feel for how much lateral stress your
> tower can handle.
>
> But if I had 30' of *guyed* Rohn 25 sticking out of 1/2 cu. yd of
> concrete at a slight angle and for some reason absolutely needed to make
> it plumb, I'd do this:
>
> 1) I'd rig up a ratchet binder (come-along) or 2 in the appropriate
> direction(s) attached to to the top of the bottom section (10' or 15'
> up) and anchored out to solid attachment point(s).
>
> 2) I'd dig out all the way around the foundation.
>
> 3) I'd loosen the guy(s) in the direction(s) the tower is leaning.
>
> 4) I'd tighten the ratchet binder(s) to plumb the tower.
>
> 5) The best back-fill would be additional concrete all around. A
> *little* soupy would be best so it under-fills any new gap under the
base.
>
> 6) Of course leave the ratchet binders in place and the loosened guys
> loosened until the new concrete is well set.
>
> If your existing concrete is something like 2' x 2' x 3' deep, this
> should work. If it's a lot bigger or wider, it will be more of a problem.
>
> Note: Personally I wouldn't worry about a little lean, but everyone has
> their own priorities.
>
> Best,
>
> -Steve K8LX
>
> On 2/11/2016 6:51 PM, Douglas Ruz (CO8DM) wrote:
>
> > Hi,
> >
> > I have been thinking and I am really want my tower straight and plumb.
> >
> > I am considering digging out some side of the base to adjust the tower
> > level.
> >
> > Any tips or thoughts ???
> >
> > Can I just digging 2 sides or all 4 sides of tower bease???
> >
> > About backfilling...what is the best add concrete again for
backfilling???
> >
> > what is the best method to move the base to adjust the level ??...it is
> > about 2000 pounds base.
> >
> > Thanks in advance,
> >
> > 73....Douglas, CO8DM
>
> >> If your tower is the equivalent of R25, and only 30', there's not much
> >> you can do to it to really overstress it, unless you try real hard.
> >>
> >> But if you really want it straight AND plumb, consider digging out
the
> >> appropriate side of the foundation and letting the the concrete adjust
> >> itself, and then backfilling it back in.
> >>
> >> At that point it will become what you want it to be, merely an
> >> anti-sink device.
> >>
> >> -Steve K8LX
>
> _______________________________________________
>
>
>
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