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RE: Slab on grade

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Dobies are typically used in SOG construction, not elevated slabs.  Bolsters is another term for chairs.  In elevated construction chairs are used to secure reinforcing steel that serves as the support for the other specified reinforcing steel.  When the chair becomes so short it is just a strip on the bottom of the form for reinforcing clearance, the correct term is bolster.
 
The distinction is important in some regards, particularly in review of PT layout and profiles.  The offset for the PT CGS is different for a chair than a bolster, by the diameter of the intermediate bar.
 
The terminology is frequently inter-mixed and not used in the true sense.  Chairs used to be actual four legged wire stands with plastic coated feet, but most often today the entire chair is plastic.
 
Paul Feather PE, SE
 
 


From: SGE Structural [mailto:sgordin(--nospam--at)sgeconsulting.com]
Sent: Monday, November 10, 2008 10:33 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Slab on grade

Dobies: Precast concrete spacer blocks with wires used in reinforced concrete construction. 
 
What is bolsters?
 
V. Steve Gordin, SE
Irvine CA
----- Original Message -----
Sent: Monday, November 10, 2008 10:13
Subject: Re: Slab on grade

Small concrete bricks.

On Mon, Nov 10, 2008 at 12:34 PM, Gordon Goodell
<GordonGoodell(--nospam--at)harmonydesigninc.com> wrote:
> What are dobies?  I've always spec'd bolsters.
>
>
>
> Thanks,
>
> Gordon Goodell
>
>
>
> From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
> Sent: Sunday, November 09, 2008 4:00 PM
> To: seaint(--nospam--at)seaint.org
> Subject: RE: Slab on grade
>
>
>
> As much complaining as I hear, I thought we would be talking megabucks
> difference, but when push comes to shove, there is no difference.
>
> I insist on dobies and using a 4x4 WWR makes it easier to walk on.
>
> Regards, Harold Sprague
>
>
>
> ExchangeDefender Message Security: Check Authenticity
>

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