I recently poured a base for a 90 ft Sky Needle tower. The original plans
call for a 4 X 4 X 8 ft hole. I believe current requirements are 5 X 5 X 9
ft.
What's funny, this same tower that I own survived for more than 30 years
with the smaller foundation thru many monsoon winds, micro-bursts,
lightning and all. The County engineers here did not have the newer specs
on had, but felt the old ones were adequate.
I agree, "the lawyers have changed the engineering specs over the years".
Ray,
N6VR
On Wed, Oct 22, 2014 at 4:57 PM, Paul Braiman <braimanbiz@charter.net>
wrote:
> I just finished erecting a Tashjian LM 354HD. Spec for the concrete base
> was 3.5' x 3.5' by 7' deep. I ended up with 4' x 4' x 8’. I sleep slightly
> better at night. :)
>
>
> On Oct 22, 2014, at 11:42 AM, Ken <wa8jxm@gmail.com> wrote:
>
> >
> > On Oct 22, 2014, at 10:39 AM, David Gallatin via TowerTalk wrote:
> >
> >> I have a pour scheduled for Monday. $233 for 1.5 yds direct into my
> hole, which I go now to dig. My back hurts already. :) 73,
> >
> >
> > Yikes, I hope you aren't digging it by hand! Better hurry up and hope
> you don't hit rock!
> >
> > (I have a rock layer here at 40" down.)
> >
> >
> > As for your original question, I find it amazing how requirements have
> changed since I got my license (1963). Look around at all the towers
> standing for 30 years and I'll bet they don't have high strength concrete
> and complex rebar. They just won't last.... ;-) Seriously, I put up
> a 64' freestanding Heights tower twice in 1970 and 1975 and hand mixed the
> concrete (two days on the first one using Sackrete) and it only needed a
> 4x4x4 base back then with a TA-33 tribander and other antennas on it.
> >
> > I do think the lawyers have changed the engineering specs over the years.
> >
> > Good luck digging,
> >
> > Ken WA8JXM
> > _______________________________________________
> >
> >
> >
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