] [Thread] [Date] [Author]

[chuck utzman <chuckuc(--nospam--at)pacbell.net>]

In Marin SOP is more like 18" dia. with 6"x10" stirrups. 14' is a 
serious retaining wall. If it's all cut, that will usually put you into 
good rock & a keyway sometimes works better than piers.
Chuck Utzman, PE

bcainse(--nospam--at)aol.com wrote:
> 14" Ø piers don't sound adequate for the loads you are talking about 
> even with the reduced spacing. With 3" clear to reinforcing your 
> outside of your spirals would have a diameter of only 10 inches, 
> theoretically and drillers can't get that close to your theoretical 
> position.  Figure at least 1 to 2" horizontal tolerance and the circle 
> gets even smaller.
>  Regards,
> Bill Cain SE
> Berkeley CA
>  
> -----Original Message-----
> From: Adjebli(--nospam--at)wmconnect.com
> To: seaint(--nospam--at)seaint.org
> Sent: Wed, 14 Mar 2007 11:50 AM
> Subject: Re: 14' Tall concrete Wall
>
> Hello, Yes I am reducing the pier spacing to 6' 6" and make the 14" 
> Diameter, while The foundation wall 10" and a counterfort wall inside
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