I intend to have a three inch sweep for the RF/control cables, a one inch sweep
for power to the tower motor, and three one inch sweeps for each of the ground
radials. The hole for the base turned out larger than the designed size
(surprise!) and will require over twice the concrete. So I figure that the
incursion of the above mentioned conduits shouldn't compromise the base much.
I am putting the conduits into the base for two reasons:
1. It is located in a patio area and there will be paving stones placed up to
the edge of the base.
2. I don't want family or friends to trip on the cables.
Now why do I have the tower so close to the house? I don't have much choice
for many reasons, including mature trees that my wife wants left alone, desire
to minimize the visual impact to neighbors, etc.
Thanks,
Craig, AE7I
Gene Smar <ersmar@comcast.net> wrote:
Craig:
I've seen this done on many of my projects when I designed electrical
power distribution substations for a power company. Typically this
technique is used when one crew installs facilities like underground
cable-in-conduit systems encased in concrete within the substation proper,
and another crew continues the conduit system underground to the next
station. This is exactly what your contractor is proposing.
I would caution, however, against installing too many of these embedded
conduit sweeps in the tower base. Without doing the math, it would seem to
me that too many (number is open to discussion/debate/calculation) such
columns of air within the concerete mass might jeopardize the mechanical
strength of the base itself. Caveat Amateur!
73 de
Gene Smar AD3F
----- Original Message -----
From: "Craig Sande"
To:
Sent: Wednesday, March 30, 2005 1:29 PM
Subject: [TowerTalk] Wet setting conduit?
> I am planning a tower base pour and my contractor has already dug the
hole, framed it, and inserted the base. When it comes to placement of the
conduit, he has suggested "wet setting" the conduit sweeps. The way he
described it to me is that rather than creating a trench to the base ahead
of time and bracing the conduit, he plans on partially filling the hole with
concrete, then submerging the conduit sweep to the wall of the hole with
some form of foam protective cap. Then after the concrete has fully set, he
will trench down along the side of the concrete base, ream out the
protective foam cap, and extend the conduit to the house, ground trenches,
etc.
>
> Has anyone ever heard of this technique? I've tried to find information
on the internet without much success.
>
> Thanks,
>
> Craig, AE7I
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
> _______________________________________________
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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