Sunday, January 1, 2012

RE: Foundation piles deviations

The Deep Foundations Institute (DFI) publishes the Augered Cast-in-Place Piles Manual which should be a reference in your specifications as it contains acceptable industry tolerances.  The Continuous Flight Auger (CFA) method is used for the Augered Cast-in-Place (ACP) pile.  The method was developed by Intrusion Prepakt when they were based in Cleveland back in the 1950's.   Charlie Berkel was a developer, worked for Intrusion, and then set up Berkel and Company in 1959 in Kansas and has been drilling them all over the place.  The other name for these piles is Auger Pressure Grouted (APG) piling.  They are all pretty much the same thing. 
What you did not state is whether or not you have a pile cap.  You also did not state the nature of the deviation.  I presume that it is a plan deviation.  If you have a plan deviation then the remedy is to adjust or add a pile cap or grade beam to serve as a bridge.  The nice thing about these type of piles is that you can just chip the top off and add a grade beam easily. 
ACP piles are very versitile and good and economical foundations.  But you need good inspection services and good special inspections.  The DFI has many good publications that can be referenced and purchased regarding inspections and industry practices.  I would suggest that you get some of these documents and require their use to facilitate proper construction within appropriate tolerances.  The logs of the inspector should be kept and should let you know what happened.  If not, you need a good inspector. 

Regards, Harold Sprague

Subject: Foundation piles deviations
Date: Sun, 1 Jan 2012 15:47:38 +0200


I have a building in construction phase, as the designer, the contractor and the client are sending the as-made location of the foundation piles.

The piles were done by CFA Method, 70cm diameter, 15m depth.

Almost each of the pile was done in deviation from the original design location I'd designed, about 2% to 20%

Do you know a kind of rectification for this kind of installation errors, or just to execute some other ones?

Executing other ones will be very complicated; I'm looking for other smarter solutions.



David Cohen





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