Most California Building codes for counties and cities require that
any concrete pour 24" or more deeper must be vibrated. All the towers
that I've installed in California have had a building inspector on
site or I have
to show where I've rented a concrete vibrator.
also, some counties are now requiring an on-site slump test for the pour taken
from the bottom of the hole, middle and the last pour on the top if
the concrete
is over normal 'driveway' specs. This means that if the building
dept requires
this you have to have an outside 3rd party at the pour to run the
tests and provide
the results to the building dept ( on-site, 3day and 28day slumps)
which usually
an additional $500-$700 for the pour.
So, if the engineering plans have a spec concrete mentioned, try to
get the engineer
to remove this and just order the concrete with the spec. Don't let
it be noted
on the engineering plans or you will be paying for the tests.
Bob Smith
NA6T
Robert Smith Consulting
"Wireless Installations -- Government, Businesses & ISP's"
F.C.C. Licensed-Commercial & Amateur Services
A.R.S NA6T
ARRL Life Member
1-707-964-4931 w/answering machine
Fort Bragg, California 95437
"On The Air-Conditioned Mendocino Coast, In REAL Northern California"
No trees were destroyed in the sending of this message.
However, a large number of electrons were terribly inconvenienced.
------------------------------
Message: 9
Date: Thu, 16 Aug 2007 08:34:44 -0700
From: "Dana Roode" <dana.roode@gmail.com>
Subject: [TowerTalk] Vibrator for 2x2x4 hole?
To: towertalk@contesting.com
Message-ID:
<ce8e49060708160834r1b286a63r970ae8aa8df85cf7@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Folks - for a 2x2x4' Rohn 25 base concrete foundation, do I need to
use a concrete vibrator during the concrete pour?
dana
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