Okay, I guess I'm going to end the discussion by sincerely thanking
all who responded.
The array of answers, here and privately, was impressive to say the
least and ran the gamut from really helpful, typical ham responses of
"what I'd do," to some that were basically "you are an idiot for even
asking such a question without a certified engineer and thinking you
could possibly put up a tower without mega-money."
I do thank all for the response, regardless of the side you took. Some
very fine information came my way and the few responses that were
incredibly negative or amazingly over-engineered also helped, in their
own way.
This is not planned to be a 150 foot commercial tower, engineered to
death with every possible legal contingency figured and refigured - it
is simply a relatively small ham setup - like 99% of us have - on
nine acres out in the country, designed to handle a relatively small
antenna load (per the manufacturer's specs).
I sincerely appreciate all the help and I believe I now know exactly
what I will do here. It will be done well, it will be very safe, and
it will be very permanent. Thanks again all.
Michael Goins, k5wmg
Professor, Writing
University of Texas at San Antonio
On Sat, Feb 13, 2010 at 9:40 PM, Jim Thomson <Jim.thom@telus.net> wrote:
> gents
>
> When installing free standing towers on ROCK, you have a few options. My
> buddy has a huge trylon, that is located on solid rock.
> Instead of messing about with jack hammers, he used TRYLON'S suggested
> method and used rock anchor bolts.
>
> Three holes were drilled into the rock, about 2" diam x XXX feet deep.
> Anchor's inserted and packed with special epoxy goop
> [ NON shrinkable epoxy] On some trylon towers, 2 x anchor rods are used
> for each tower leg [ 6 x anchor's in total.. and 5' long]
>
> We also used the same technique at the Telco I worked at for 34 yrs... for
> microwave tower's and also cell towers... located on remote
> mountain tops [ read 100++ mph winds + 1-3" of radial ice] Rock anchors
> also used [ usually in pair's] for guy anchors, for guyed microwave
> tower's.
>
> Plan B [ also from Trylon] is to use huge jumbo size HILTI anchors.
> These things are are 24" long x 2" diam ... and made spec
> for anchoring towers ! I have installed thousands of hilti anchor's at
> work, yr ago.. and usually in both floors and also hundreds of em
> in the concrete ceiling's [+ elevator shafts etc] We hung thousands of
> lbs of cable runways on small hilti anchors, suspended from the ceilings.
>
> These day's everything has to be seismic rated in BC. In the last few
> years, all our equipment bays [19"-30" wide] are heavy duty steel
> with these monster size hilti's in the floor. When that earthquake in
> wash state hit us.. a few yrs ago.... they held just fine... didn't budge.
>
> Didn't even know they made these super jumbo size ones for tower's. The
> internal bolts for em are 1" diam x 30" long. The anchor itself
> is 2" diam x 24" long... and requires a special hilti drill. These
> 2" x 24" long hilti's I believe, are made for CONCRETE... dunno if they can
> also be used in
> rock..or not. The idea of em is so an existing concrete base can be
> re-used on another tower. All this info is on Trylon's site.. or just
> phone em.
>
> later....... Jim VE7RF
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