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Re: Drilled Pier Question

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I generally do not go less than 12" diameter. It is difficult to place
reinforcing. I increase in 2 inch increments.
For bell bottom footings, I keep the bell diameter no more than 3 times the
shaft diameter.
These are,of course, rules of thumb. Always consult a Geotech about in-situ

Randy Russ, P.E.
Russ Engineering

-----Original Message-----
From: RJConley(--nospam--at) <RJConley(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Date: Saturday, November 21, 1998 5:19 PM
Subject: Drilled Pier Question

>What is the minimum shaft diameter possible and what is the increment in
>diameters?  I am currently investigating the possibility using a single row
>drilled piers to laterally support a retaining wall for a flood control
>channel and would like to keep the pier diameter as small as possible.
>Bob Conley, P.E.