The foudation looks small, but one can't tell without the foudation reactions.
You need to know the SHEAR, AXIAL LOAD and OVERTURNING MOMENT for the
foundation, under wind loads. For a 68' structure I would START look and pier
type foundation about 7' deep or 10% of 68'. The easiest foundation to build is
a mat type foundation which the .5 m X .5 m seams more like a pier than a mat.
With a mat one need to keep the load within the kern (middle 1/3) to keep a 1.5
factor of safety for overturning. Their foundation looks more like a fence post
than a mat. Maybe the wind loads are small and it works. Can't tell without the
reactions.
And yes, you are correct about the frost zone for the foundation depth.
Tower2sell@aol.com
In a message dated Tue, 16 Jan 2001 12:53:05 PM Eastern Standard Time, Jay
Terleski <wx0b@arraysolutions.com> writes:
<< Gentlemen,
I recieved this information from Titanex's Dr. Szobolcs about the
vertical base.
"Dear Jay,
the concrete for V 160HD and V 80HD is depending from the ground
condition.
But 50cm x 50 cm and 1m deep should be ok."
So .5m X .5m S 1 m deep seems to be their recommendation, for ground
conditions, and please help me out some of you PEs. If the frost line
in your area is lower than 1 meter should the concrete extend below this
frost line. And if so how much.
The V160HD is a large vertical antenna and it is winched into place with
the base system. I would think that a hole larger than .5m square would
be good insurance to make sure the base doesn't move around. And cement
is cheap.
I hope this clarifies the discussion some, and I do hope one of you PE's
will add the additional information needed.
Specs for the V160HD are tapered Titanium AL tubes from 80mm to 18 mm at
the tip.
Weight of antenna without base is 55 lbs.
Jay, WX0B
"Roger C. Stimson" wrote:
>
> Steve,
> I have just purchased a Titanex V80 HD vertical antenna. It
> is 68' x tapered 4 " to 3/4" aluminum and is designed for a
> self-supporting installation. However, Titanex has not provided any
> engineering drawings for the base which is made of two 3" x 2" x 6' 9"
> galvanized steel c-beams. Is there a source for determining the size
> concrete foundation for such an antenna?
> Thanks,
> Roger K8RS
>
> --
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--
Jay Terleski
WX0B - Array Solutions
www.arraysolutions.com
--
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Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
>>
--
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