[TowerTalk] [Bulk] Re: Using old concrete in new pour

[Grant Saviers]

Rather than the lawyers, I think it is the building code writers - check 
out the upgrades to the required wind velocities and exposure 
calculations in the EIA specs over the years.  Then the enforcers in 
your local permit office require compliance and tower manufacturers 
comply or sell fewer towers.

Lawyers however, are at the end of that food chain (your choice as to 
which end).

not a lawyer

Grant KZ1W


On 10/22/2014 6:50 PM, Ray Benny wrote:
> 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 at 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 at 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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