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RE: Pile Design

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Title: RE: Pile Design

Stuart,

The true auger cast pile is formally called the auger cast pressure grouted (APG) pile and is not a displacement pile.  The hole is drilled and the spoil is trucked off site.  The grout in the pile is pressure injected through the auger while the auger maintains positive rotation, and a given pressure.  This type of pile will not disturb adjacent utilities or other subgrade structures. 

 

There is a different pile called the auger cast pressure grouted displacement (APGD) pile that is used as a displacement pile.  This type of pile can displace subgrade utilities and structures as it displaces the soil laterally, but will not have any spoil to truck off site.  To see the difference look at Berkel's web site at: http://www.berkelandcompany.com/Home.html

Regards,
Harold O. Sprague

-----Original Message-----
From: Stuart, Matthew [mailto:mStuart(--nospam--at)schoordepalma.com]
Sent:
Monday, September 22, 2003 12:59 PM
To: '
seaint(--nospam--at)seaint.org'
Subject: RE: Pile Design

 

He maybe referring to auger cast piles, which are a true cast-in-place displacement pile.

D. Matthew Stuart, P.E., S.E., P.Eng.
Senior Project Manager
Schoor DePalma Engineers and Consultants
Manalapan Structural Department
200 State Highway Nine
Manalapan, NJ 07726
732-577-9000 (Ext. 1275)
908-309-8657 (Cell)
732 -431-9428 (Fax)
mstuart(--nospam--at)schoordepalma.com

-----Original Message-----
From: Nitin Christopher [mailto:nchristopher(--nospam--at)watrydesign.com]
Sent: Monday, September 22, 2003 1:41 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Pile Design

The correct terminology for such a  cast-in-place deep foundation system
is cast-in-place drilled piers and not piles.

The moment and shear capacities of the piers are a function of the
capacity of the dirt surrounding the pile.

The piers are design using PCA-COL for the moment from the moment vs
depth curves provided by the geo-tec and the axial demand could be
conservatively - the allowable capacity in bearing or skin friction or a
combination of both with suitable reductions per the geotec
recommendation. For the strength level design of the pier use
appropriate load factors.

Depending  on the shear demand (lateral or sliding) at the top of the
piers adequate shear reinforcing (shear friction) needs to provided.

Hope this helps.
Nitin

swijay(--nospam--at)fdgoc.com 09/22/03 09:46AM >>>
I am looking for a reference or methodology for the design of concrete
cast in place piles. I  appreciate for the help and info.

 

Shamini A. Wijay P.E,
Project Engineer

 

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