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Re: 14' Tall concrete Wall

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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.
Bill Cain SE
Berkeley CA
-----Original Message-----
From: Adjebli(--nospam--at)
To: seaint(--nospam--at)
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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