Bob and TT:
What you need to do is have the engineer specify and design
for less than 3000 psi. The special inspection section of
the CBC ( California Building Code) (essentially the 1997
UBC) doesn't require concrete cylinders (special inspection)
for less than 3000. This is what I specify for amateur
installations.
Regards
Lonberg Design Group, Ltd.
H.S. Lonberg, P.E., S.E.
President
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Bob
Smith
Sent: Thursday, August 16, 2007 6:03 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Vibrator for 2x2x4 hole?
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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