Fernando:
As someone who works in the wireless industry, my advice is have a
Professional Engineer design your tower foundation for you. You're engaging
in a commercial enterprise, wireless Internet access, for which you will
RECEIVE money. It is only prudent to use some of this money to ensure your
tower will not become a danger to the public, for which you will PAY money
if it fails.
Regards,
Gene Smar AD3F
-----Original Message-----
From: Fernando Ronci <fernando@waycom.com.ar>
To: towertalk@contesting.com <towertalk@contesting.com>
To: <towertalk@contesting.com>
Date: Thursday, February 01, 2001 3:28 PM
Subject: [TowerTalk] Tower foundations
Hi all,
I know it would be more appropriate to post this consult on a civil
engineering forum. It even has nothing to do with RF, but as many of you
have a lot of expertise in the tower building field, I thought someone could
help.
I need to build a 60 m (200 ft) guyed tower to provide wireless internet
access. It will support 4 parabolic 89cm diameter solid dishes and a couple
of omnidirectional antennas. The steel tower section is a triangle, 45 cm
each side.
Considering the soil strength is 1 Kg/cm2 and 140 Km/h the wind speed, I am
concerned about the reinforced concrete foundation design, that is, the
compressed base supporting the tower and the three tensioned anchors. Each
anchor is 42 m away from the tower. (I wish they were 45 m away at least,
but the lot size allows 42 m only)
In this case, which I believe must be pretty common, what are the base and
anchors usual shapes and sizes and how is the steel reinforcement
distribution on each? What depths must the foundations be executed at? I
used to see larger towers founded on piles, but I don´t think they will be
necessary in this case.
Please don´t missunderstand me. I don´t want anybody to do the calculations
for free. I just want to know if what I´m asking is well known standard
information of tower building, maybe found on tables I don´t know of.
Internet addresses where I could see examples of this are also welcome.
Thank you very much.
Fernando Ronci
E-mail: fernando@waycom.com.ar
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