At 12:13 PM 7/5/2005, JC Smith wrote:
>Hi Gene,
>
>As you know, I'm planning on this type of tower. I've been looking at the
>foundation options and I really don't want a 9' x 9' (or even an 8' x 8')
>concrete pad under the tower (the Solid Block option) but I don't like the
>idea of forming and compacting either. Seems to me that if you do two pours
>y
You might want to talk to a local engineer about the idea of drilling a
deep round hole and setting a caisson type base. I hesitate to speculate
about sizes, but about a year ago, they were installing some traffic lights
on a 6 lane wide road near my house. It had to support a canteliever all
the way out over the left turn pocket, 30-40 feet away from the main
pole). Huge bending moment load, especially when you add the required
seismic (0.6g, I think) and wind loads. Those traffic lights aren't
lightweight, nor are the signs, etc.
They basically drilled a 2 or 3 foot diameter hole some 15-20 feet deep
(with a big truck mounted auger), lowered a big rebar cage into it, and
filled it with concrete. It ain't necessarily cheap, but the surface
disruption is small: they jackhammered out about 6 feet of sidewalk on the
corner and did it in the rectangular hole that was about 4x6 ft, then
poured a new sidewalk slab around it. A 8x8x8 foot cube of concrete isn't
going to be cheap either.
Jim.
_______________________________________________
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.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|