[UK-CONTEST] Tower Question

[Clive GM3POI]

Yes the idea about the studs is fine. I used plastic water pipe and used 
plate steel to make some big washers for the lower part of the studs. Mine 
were 25mm studs and I had to use 10 cubic metres of concrete (it's a large 
tower).
    I would try to avoid steel guying as it will require insulators to break 
up otherwise resonance's in the guy system and at 28mhz that's a lot of 
insulators. The other thing to keep in mind with guying crank up towers is 
that the horizontal wind speed will be transformed into downward force on 
the crankup cables leading to possible problems.
    I speak from experience in having an 8mm new crankup cable break (mid 
wire) during a 130mph storm, I have since changed to 11mm cable!!. 73 Clive 
GM3POI
----- Original Message ----- 
From: "Adrian Rees" <rees.a at btconnect.com>
To: "UK Contest Reflector" <uk-contest at contesting.com>
Cc: <g4buo at compuserve.com>
Sent: Tuesday, November 21, 2006 12:30 PM
Subject: [UK-CONTEST] Tower Question


> The great day has finally arrived, and Tower number one is being installed 
> on Saturday.....well, the Concrete is being poured !
>
> A quick question: The Tower is an old BXI Tower, that was originally post 
> mounted.( I cut the post at ground level to remove it, (its the one from 
> your neck of the woods, Dave) and have since had a 1 Metre Square sheet 
> Steel plate (28mm thick) welded to the post, complete with fillets. So it 
> now looks like a Base type of mount. (Typical Versatower)).
>
> Anyway, as I havn't any documentation for the tower, so.... I am going to 
> pour C35 Grade concrete into a 1m X 1m X 1m hole. The retaining studs that 
> run through the base plate and into concrete, are made of 35mm studding, 
> 85cm long (75cm in concrete). Each length of studding has a 15cm Square 
> plate (28mm thick) welded to its base. The idea being that the Square 
> plate will anchor the stud (and the base plate) to the concrete.
>
> Each of the Four Studs will be held in place by a wooden frame, the 
> concrete being poured in, and around the studs, and the frame removed 
> after the concrete has gone off.
>
> Two Questions:
>
> Given the mast will be guyed with Steel Rope, does the above seem OK ?
>
> I want the studs to have some "play" (not much say 10 mm or so, just to 
> allow instalation) so I plan on wrapping them in some foam piping   (sort 
> of thing to insulate lofts) for the top 30cm or so. Does this sound 
> reasonable ?
>
> 73
>
> Adrian MW1LCR
>
>
>
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