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Supporting rebar? HockeyFan 02-12-2007
|--> Re: Supporting rebar? Michael Bulatov...02-12-2007
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Posted by Bob Morrison on February 12, 2007, 11:03 pm
In a previous post Steve Barker wrote...
> Flat workers pull the rebar up into the pour as they go.
>

That may be true for welded wire mesh, but not for actual bars. Bars are
supposed to supported on chairs or masonry blocks made for the purpose,
commonly called "dobies" as "marson" posted in his message.

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Posted by Don on February 13, 2007, 8:19 am

> In a previous post Steve Barker wrote...
>> Flat workers pull the rebar up into the pour as they go.
>>
>
> That may be true for welded wire mesh, but not for actual bars. Bars are
> supposed to supported on chairs or masonry blocks made for the purpose,
> commonly called "dobies" as "marson" posted in his message.
>
> --
> Bob Morrison, PE, SE
> R L Morrison Engineering Co
> Structural & Civil Engineering
> Poulsbo WA
> bob at rlmorrisonengr dot com

Even if wire mesh gets pulled up by the flat worker he will only step on it
and push it back down when screeding.



Posted by Michael Bulatovich on February 13, 2007, 8:31 am

>
>> In a previous post Steve Barker wrote...
>>> Flat workers pull the rebar up into the pour as they go.
>>>
>>
>> That may be true for welded wire mesh, but not for actual bars. Bars are
>> supposed to supported on chairs or masonry blocks made for the purpose,
>> commonly called "dobies" as "marson" posted in his message.
>>
>> --
>> Bob Morrison, PE, SE
>> R L Morrison Engineering Co
>> Structural & Civil Engineering
>> Poulsbo WA
>> bob at rlmorrisonengr dot com
>
> Even if wire mesh gets pulled up by the flat worker he will only step on
> it and push it back down when screeding.

Not if they have X-ray vision and 4"x4" feet...

There's an amazing 'spit' here in Toronto made mainly of construction
detritus, and it's a 'little sop of horrors' if you like to see reinforcing
steel where the drawings say it should be. Chunk after chunk have the steel
substantially out of place. Even the easy parts like columns.

http://tinyurl.com/pl6tz

http://en.wikipedia.org/wiki/Leslie_Street_Spit
--


MichaelB
www.michaelbulatovich.ca



Posted by DanG on February 12, 2007, 11:30 pm
Don't ever depend on finishers to pull up rebar, it is impossible
once the concrete is on it, and architecturally supervised pours
will not allow it. Sand chairs are difficult to keep in position,
most everyone uses concrete brick.

--
~~~~~~~~~~~~~~~~~~~~
DanG
A live Singing Valentine quartet,
a sophisticated and elegant way to say I LOVE YOU!
valentine@okchorale.org (local)
http://www.singingvalentines.com/ (national)


> I'm curious what most people do to prevent rebar from sinking
> into the
> dirt as pressure is applied during the pour (especially with
> workers
> stomping over it during the pour).
> I know about the TieBrick product, and interested how many use
> that,
> but also about what most do to insure that the rebar remains at
> the
> depth in the concrete as intended.
>



Posted by Michael Bulatovich on February 13, 2007, 8:33 am
I've never seen the brick used. Is it for work on grade only? Are they
typical 'concrete bricks' or a special, smaller product?
--


MichaelB
www.michaelbulatovich.ca

> Don't ever depend on finishers to pull up rebar, it is impossible once the
> concrete is on it, and architecturally supervised pours will not allow it.
> Sand chairs are difficult to keep in position, most everyone uses concrete
> brick.
>
> --
> ~~~~~~~~~~~~~~~~~~~~
> DanG
> A live Singing Valentine quartet,
> a sophisticated and elegant way to say I LOVE YOU!
> valentine@okchorale.org (local)
> http://www.singingvalentines.com/ (national)
>
>
>> I'm curious what most people do to prevent rebar from sinking into the
>> dirt as pressure is applied during the pour (especially with workers
>> stomping over it during the pour).
>> I know about the TieBrick product, and interested how many use that,
>> but also about what most do to insure that the rebar remains at the
>> depth in the concrete as intended.
>>
>
>



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