[TowerTalk] Tower Base Construction Question(s)

[Andre Van Wyk]

Marinus,

Since I am fimiliar with the South African regulatory requirements, you will
be much better of using the services of a civil engineer, as you will need
to submit engineering drawings anyway for council aproval in Pretoria.

Get in touch with Callie, ZS6BRY. He is a registered professional engineer
and live around the corner form you. Tel him I reffered you, as he is a
friend. He will assist you,and  he is a ham too.... This way you will safe
yourself a lot of headaches if something goes wrong......

This is the correct way to do this.

Merry X-Mass!

Andre KR5DX (ex ZS6WPX)

----- Original Message -----
From: "Marinus Willemstijn" <willemma at telkomsa.net>
To: <towertalk at contesting.com>
Sent: Tuesday, December 18, 2007 10:46 AM
Subject: [TowerTalk] Tower Base Construction Question(s)


> Good Day to all
>
>
>
> I am constructing a tower base and have tried to read about the subject as
> much as possible. I have a few questions which I hope can be answered via
> this forum.
>
>
>
> Background
>
>
>
> Tower is Triangular 3 x 7 M sections Crank Up tower tilting over at 2
> meters. Soil is a solid Red Clay soil. What I could gather is that the
base
> should at least be 1Meter deep (Form soil level) so the hole I dug is 1M x
> 1,7M x 1,17M and then about 150mm of concrete will be above soil level -
the
> bolts used to tie down the base will be approx 100mm above the concrete.
>
>
>
> My question is about the cage. I am using 16mm Re-Bar. I have read that
the
> rebar cage should be around 300mm away from the side of the Concrete block
> to ensure its away from the soil at the bottom and sides.
>
>
>
> Is this correct?
>
>
>
> Secondly I have read that the cage is made with binding wire or cable ties
> and not welded.
>
>
>
> Is this correct?
>
>
>
> Now my towers' base gets tied down with 3 threaded bolts of 1 meter each
>
>
>
> Do I weld these three bolts to the cage? If not how is it connected? I
know
> that somehow the 3 bolts must be electrically connected to the Rebar cage
> for earthing purposes.
>
>
>
> Lastly I see many drawings that the ends of the vertical bars of the cage
> are bent - why is this and is it really necessary?
>
>
>
> Any help or advice will be appreciated - Thanks in advance.
>
>
>
>
>
> Marinus Willemstijn
>
> ZS6MAW
>
>
>
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>
>
>
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