I have seen guy stays placed at a slight angle away from the tower and
another guy (or extention of the guy) down at a sharp angle. Now would
this arrangement be OK?
Chris opr VE7HCB
At 09:48 PM 2002-06-25 -0700, Hank Lonberg wrote:
>Joe:
>
>I find it amazing that you can determine the soil bearing capacity at
>the guy's site without any test or default basis.
>
>Based on the worst case UBC soil lateral bearing and isolated post
>capacity equation; using a 3' hole 4' deep filled with concrete and
>casting in a Steel member that is 6' above ground I get a capacity of
>about 1000 pounds horizontal and say 1000 pounds vertical which equates
>to a total guy capacity, assuming 45 degrees, of about 1400 pounds. This
>would be the safe total load on your eyeball system given no available
>soils information. This value is base on table 18-I-A in the 1997
>Uniform Building Code. Your mileage will vary depending on what code you
>use.
>
>It is quite possible that the total guy load on a 70 ' tower will exceed
>this amount. Most likely if two or more guys are attached to the
>elevated guy post.
>
>The weak link is not the steel member but the soil's ability to
>withstand the load you are hoping it will resist.
>
>Hank Lonberg, S.E.,P.E.
>KR7X
>
>
>
>
>-----Original Message-----
>From: towertalk-admin@contesting.com
>[mailto:towertalk-admin@contesting.com] On Behalf Of Joe
>Sent: Tuesday, June 25, 2002 7:56 PM
>To: K7LXC@aol.com; jperalta@tampabay.rr.com; towertalk@contesting.com
>Subject: Re: [Towertalk] Raised Guy Stays
>
>At 03:53 6/26/02, K7LXC@aol.com wrote:
> >In a message dated 6/25/02 4:22:43 PM Pacific Daylight Time,
> >jperalta@tampabay.rr.com writes:
> >
> > > I'm getting ready to extend the height of a 30' Rohn 25 bracketed
>tower to
> > > about 70' and I would like to use raised guy stays ( I think that
>is what
> > > they are called ) to get the guy wires above head height.
> > The best material is I-beam (eye-beam, H-beam). It's much stronger
>than
> >round elevated guys.
> >
> > Put 60% of the guy in the ground and 40% above the ground and
>you'll be
> >in good shape.
>
>I-beams are the way to go. But let's see here, guy wires above head
>height
>= say 6 feet. Therefore 40% of x = 6 feet. If I recall my algebra
>correctly
>x would = 15 feet. Which would equate to 9 feet in the ground? I think
>this
>is a bit much for any 70 foot tower. Put the i-beam in the ground 4 foot
>
>with rebar and Johnson studs with concrete and it will hold anything you
>
>want to put up. A 10 foot i-beam is plenty.
>
>Joe - WL7E/W7
>
> >
> >Cheers,
> >Steve K7LXC
> >TOWER TECH
> >
> >_______________________________________________
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> >Towertalk@contesting.com
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>
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