[TowerTalk] Guyed + self supporting /2 ??

[Roger (K8RI) on TT]

25 and 45G can be tilted up in substantial lengths with sufficient 
guying and tension.  Depending on weight and antennas, several sections 
of 25 or 45G can be between the guys.

45G can be tilted up and still set on a pier pin.  With a bit of 
planning, it's not all that difficult.

Adding guys to a free standing tower is asking for trouble.
With the pier pin base on a guyed tower, torsion is no longer a tower 
problem and is addresses with the guys. Usually using a star guying setup.

73

Roger (K8RI)

On 10/15/2014 12:02 PM, Richard (Rick) Karlquist wrote:
> To clarify:
>
> I didn't say not to have a fixed base on a guyed tower.
> Rather, the base has to be larger than just a 6 inch
> thick slab to keep it from sinking into the ground,
> unless a pier pin is used.  For various reasons, I
> don't want to use a pier pin, and instead will make
> the base large enough.  OTOH, the needed base is
> much less than it would be in the self supporting case.
>
> So, you ask, why would I use sections intended for
> self supporting applications in a guyed configuration?
> Very simple.  I want to assemble the whole tower with
> antenna, etc on the ground and tilt it up.  That kind
> of thing has been done with Rohn 25, etc, but works
> better with sections designed to be self supporting.
> Dead weight and strength/weight ratio, and stiffness,
> normally of minor importance once the tower is
> vertical, are major issues during tilt up.
>
> Rick N6RK
>
> On 10/15/2014 7:57 AM, ve4xt at mymts.net wrote:
>> I'm curious, Rick, if your engineer addressed this question: to what 
>> extent does the warning to not have a fixed base on a guyed tower 
>> (use a pier pin instead) apply to the question of guying a 
>> self-supporting tower (which by design would have a fixed attachment 
>> to the base)?
>>
>> Seems the issue of torsion would be the same, yes?
>>
>>> From an initial design perspective, if you were planning a guyed 
>>> tower, would it make sense to pay extra for a freestander?
>>
>> It seems the question of guying applies best to attempts to increase 
>> load factor of an existing freestanding tower.
>>
>> 73, Kelly
>> ve4xt


-- 

73

Roger (K8RI)