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RE: Drilled Pier Minimum Diameter

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Richard,

	I typically use 18" as a minimum, but, I have specified 16" on occasion.
However, I have seen dozens and dozens of plans with 12" diameter piers,
typically from engineers doing residential work.  I don't care for the
smaller piers as I think it leaves alot of room for error; but that is me.

bks

> -----Original Message-----
> From: richard lewis [mailto:rlewistx(--nospam--at)juno.com]
> Sent: Friday, October 15, 2004 9:32 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Drilled Pier Minimum Diameter
>
>
> I am looking for minimum diameter of a drilled pier.  I was told by
> another engineer that is was 18" by either the ACI or the AASHTO
> specifications.  I looked in my copy of ACI 336 .3 "Suggested Design and
> Construction Procedure for Pier Foundation" and didn't find any minimum
> diameter requirements.  My copy is outdated.  I don't have any AASHTO
> specifications.
>
> The reason I ask is I was wondering if 12" diameter was standard
> practice.  I have never specified that small before.  It seems to me the
> rebar would be too close in a 12" diameter shaft.
>
> I would appreciate any insight on this.
>
> Thanks.
>
> Rich
>
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