[Top] [All Lists]

[TowerTalk] Fwd: Fwd: Want comments on tower installation

Subject: [TowerTalk] Fwd: Fwd: Want comments on tower installation
Date: Sun, 28 Aug 2011 23:52:26 -0400 (EDT)
List-post: <">>
In a message dated 8/26/2011 12:23:09 P.M. Eastern Daylight Time, writes:

On  8/26/2011 11:29 AM, wrote:
> The idea is that I  can inspect the ground connection. I also didn't want 
>    have things interfere with my lawn mower. I kept the wires as close to 
> rod  as possible, thereby minimizing the inductance. Right?  Time will 
> I have a good amount of old fencing laying  around and decided to add  
> "heavy fill" when I refilled the  hole. It is more there to stabilize the
> ground. You may note that the  only concrete is the three "pillars" 
around the
> anchor irons. There is  no access for a cement truck and this was my 
> to  make a  base. Most on the momentum is taken up by the ~4' x 6' granite
> slab  on  the bottom of the hole.

How tall is the tower?  As it's a  guyed tower the base serves little 
purposed than to keep the tower from  sinking or sliding sideways. So the 
amount of concrete and steel in the  base is not critical.
The tower is 85 feet tall. The guy wires are at the 70 feet level. I did  
studies before I decided what to do. I received the best torque distribution 
by  having the guy point at 70 feet. The stiffness of the base relieve some 
of the  torque on the tower sections. The tower was originally a self 
supporting tower,  but it can only withstand 80 mph wind. By adding the guy 
it will be able  to ride out a 120 mph wind (which I liked a lot better). 
This is with 20 sqf of  antenna surface at the top.

> I used the "falling derrick" to raise the tower.  You can see the derrick
> laying on the tower in one of the pictures.  One guy wire was attached to 
> derrick. I added some extra wire to  the guy and used a couple of
> "come-alongs"  to pull the tower up.  A motorized winch would have made 
it faster but I
> had the  time.  The "come-alongs" were attached the wire with "dead-ends"
> the same  type as  I used to fastened the guys to the anchors.

Why did you use 4 point guying and at what levels did you guy the  
tower.  If the tower is much over 60 feet the mass and type of guy  
anchors becomes much more important than the tower base.
Again, I made calculations and liked the force distribution with four  
wires. It makes the adjustment easier too, especially as I am not an expert  
here. As the guy wires work opposite each other you adjust two wires at a time  
without any influence of the others. Yes, I know it's not a big deal to 
adjust  three wires, but ... The surrounding terrain kind of "promoted" four  

> Would have been nice to see pics of the structure that  routed  the 
> wire in a high angle to erect the  tower.
I will add some drawings/pictures later so you can study me contraptions. 
73 de Hans - N2JFS

TowerTalk mailing list
<Prev in Thread] Current Thread [Next in Thread>
  • [TowerTalk] Fwd: Fwd: Want comments on tower installation, HansLG <=