What angle are the pipes on ? 45 deg away from the the
tower ?
Thanks
- Jim
--- Wendell Wyly - W5FL <wendell@wyly.org> wrote:
> I use four 10 foot 4.5 inch OD 1/4 inch wall steel
> pipe for a 62 foot Rohn
> 25 Fold Over tower with a 2 element quad. The
> vertical anchors are buried
> in the ground 5 1/2 feet with a 16 inch diameter
> hole 65 inches deep filled
> with cement. The end of the pipe is drilled and
> bolted to two 32 foot # 6
> copper ground wires that are buried for ground
> radials for each guy-wire
> anchor. I had the design analyzed in San Diego
> county when I had to get a
> permit (even for a rural area on 6 acres). The soil
> is San Diego County is
> Decomposed Granite, where your soil condition is
> probably different. An I
> beam is a nice solution as there is a nice wide
> flange to directly bolt the
> turnbuckles, where on the pipe, welding is necessary
> to get a suitable flat
> surface.
>
> I would not use anything buried only 3 feet deep and
> sticking out of the
> ground 7 feet for a 60 foot tower with reasonable
> amateur radio antennas.
> The overturning moments are very high for a vertical
> guy anchor. You can do
> a lot better letting the guy anchor be in line with
> the guy wires and using
> a large concrete piece at the bottom of the hole.
> The normal design
> criteria is for the concrete to weigh as much as the
> guy wire tension under
> full rated wind loads, which assumes that the ground
> is totally saturated
> and the weight of the anchor cement base is the
> primary resisting force.
> This is inexpensive, listed is most Rohn catalog
> details, and can use much
> smaller metal guy anchors since the only force is
> tension.
>
> Since the anchors will be in your neighbors yard
> (which I wouldn't do in a
> million years), you should pay a Professional
> Engineer to analyze (and
> probably run a soils test) and stamp the
> calculations for the guy anchors.
> This should ensure that you have a safe solution and
> it will not yield a 3
> foot depth that could give you serious problems.
>
> You might look carefully at the four point guying
> system that Rohn used to
> use on their Fold Over Towers. For a 62 foot Rohn
> 45 tower, it used 8 guy
> wires and the whole thing fits in approximately a 25
> foot radius, which fits
> most small city lots and keeps all the anchors on
> your property.
>
>
> Subject: [TowerTalk] I-beams used as guy-wire
> anchors!
> I have been on this reflector for several months.
> Aside from the occasional sidetrack, it is pretty
> darn knowledgeable.
> Having said that...I was wondering if anyone has had
> experience with using
> I-beams to anchor their guy-wires? I have a Rohn 25
> G up 60 feet. It has
> the two, called for guy positions, one at 28 feet
> and the other at 55 feet.
> Would a 10 foot , W-6 X12 X10 foot handle the load?
> I would cement it in
> the ground 3 or 4 feet. The company says that this I
> - beam would weigh 120
> pounds. Twelve pounds per 1 foot of I-beam. I have
> never dealt with this
> before as I usually run my guy-wires to the ground.
> This is an unusual
> situation because I have been graciously permitted
> by a neighbor to place
> two on his property. An attempt at using 10 foot
> schedule 80 galvanized
> water pipe got me no where, I now seek help using
> the I-beams so I can get
> 6 or 7 feet above ground to allow grass mowing.
> I'd appreciate your
> considerations.
> Regards
> 73
> Conrad
> WB3DQD
>
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting
> Towers", "Wireless Weather Stations", and lot's
> more. Call Toll Free, 1-800-333-9041 with any
> questions and ask for Sherman, W2FLA.
>
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>
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=====
- Jim Apple (WB1DOG)
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See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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