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Re: Drilled pier foundation

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Thank, Tom, for the information.

Since Auger cast pile is a speciality, it is,
presumably, more expensive than standard drilled pier.
So, what is the advantage of auger cast pile? Is it
used in silt/sandy stratum with high water table? Does
it require the use of a casing?

Rajendran

--- Tom.Hunt(--nospam--at)d-fd.com wrote:
> Rajendran,
> 
> For typical drilled piers (+/- 2 to 3 ft diam.) the
> rebar is normally
> installed prior to placing concrete.  However, for
> auger cast piles the
> standard procedure is to drill down to pile length,
> then pressure grout
> through the stem as the stem is removed, and then
> the rebar is pushed into
> the hole after the drill is removed.  We are using
> this procedure on a
> current project with 16 and 24 inch piles.  The
> rebar cages are
> approximately 30 feet long.  Note that auger cast
> piles are a real
> speciality and require a very experienced
> contractor.  They also use a
> special grout mix that is very fluid to allow the
> rebar to be pushed in yet
> achieves 4000 psi or better at 28 days.
> 
> Thomas Hunt, S.E.
> Duke/Flour Daniel
> 
> ----- Forwarded by Tom Hunt/DFD on 03/06/01 02:01 PM
> -----
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>                     Padmanabhan                     
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>                     Rajendran            To:    
> seaint(--nospam--at)seaint.org                                   
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>                     <rakamaka@yah        cc:        
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>                     oo.com>              Subject:   
>  Drilled pier foundation                            
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>                     03/06/01                        
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>                     12:41 PM                        
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>                     seaint                          
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> 
> 
> Drilled pier foundations have reinforcement
> (vertical
> bars + ties or spirals) in the upper few feet of the
> piers. Recently, I heard that it is common for the
> construction folks to place the pier concrete and
> then
> push a preassembled cage of reinforcement through
> the
> concrete. Does this method guarantee that the rebar
> can be placed reasonably close to the way it is
> detailed on the drawing? Is'nt there a good chance
> that the rebar may be bent and mangled?
> 
> Rajendran
> 
> 
> 
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