[TowerTalk] Guys:

[Bob Otto]

Hello Barry,

I'm hoping you get some input from some of the "professional" tower
guys here.  I will throw this is for you though.

A)  After putting up three freestanding tower applications, and
helping on many more, I have not seen a single free standing tower
base that is only 2' deep.  The base you describe sounds more like the
base for a guyed tower.

B)  Guyed towers are designed differently than freestanding as the
loads act significantly different.  Taking a free standing tower and
guying it isn't necessarily a good thing to do.

I would strongly urge you to either contact the original manufacturer
of the tower for information, or if that isn't possible, contact a
engineer and ask him/her to do an analysis for you to tell you exactly
what can be done with your specific tower.  I know this costs MONEY,
but better to invest now.....than pick up the pieces later when you
have that nice beam up and the tower comes down!

73 from.......

Bob Otto
N8NGA@one.net
Cincinnati, Ohio

**********************************************
DXCC 10M         ** DX is !! **        WAS 10M
       There is a very fine line between
         "HOBBY" and "MENTAL ILLNESS"
**********************************************
When trouble arises and things look really bad,
there is always one individual who perceives a
solution and is willing to take command.
      VERY OFTEN THAT PERSON IS CRAZY!
**********************************************
Saturday, November 04, 2000, 4:23:53 AM, you wrote:

BK> Am in the process of erecting a triangualr tubular steel lattice tower.
BK> Believe it was originally manufactured by Samson in Canada.
BK> Uses 1 1/4 in tubular ? 16g legs at 15in centres in 10ft sections.
BK> I have it mounted in a well reinforced concrete slab approx 6 x 6 x 2 (deep)
BK> It will carry Force 12 C4SXL at 50ft.
BK> Site is on top of a cliff 300 ft ASL and is classed as high wind zone by
BK> local standards. Last storm of cyclonic force here was in 1936 (ie freak,
BK> not seasonal). Highest wind experienced here in last 5yrs measured 90mph in
BK> Auckland City, would have been significantly higher here at ZL1DD.
BK> My unprofessional ( freshman physics) calculation and eyeballing
BK> manufacturer's recommendations for similar applications indicates that this
BK> would be at best marginal as a self-supporting structure and intention is to
BK> guy.
BK> Three guys can be fitted to site with all guy anchors approximating to 80-
BK> 100% height of structure (50ft) radius from tower.
BK> Anchor design, turnbuckles etc in line with good practice as cited by Rohn
BK> et al.
BK> I can fit two a sets of guys, but note that US manufacturers catalogues
BK> generally  advise but one set needed for towers of order of 40-50ft.
BK> Available guy material is 3/16 stranded which the supplier assures meets
BK> international standards for guy material.
BK> Question: Should I run with a single set of guys?
BK> I do not require worked analysis, looking for reports based on experience
BK> with similar structures.
BK> 73 and thanks for your time,

BK> end
BK> Barry Kirkwood  ZL1DD
BK> Signal Hill
BK> 66 Cory Road
BK> Palm Beach
BK> Waiheke Island 1240
BK> NEW ZEALAND
BK> www.waiheke.co.nz/signal.htm


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