#21  
Old 07-15-2009, 05:31 AM
tony boca's Avatar
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Default Re: Round foundation help

Thanks Neil
I drilled 3/4 holes into the foundation,filled them with concrete epoxy, and placed three 1/2" rebar. Used four 8" sonotubes. Filed them with cement and now waiting for them to cure for about 5 days before a I pour the hearth. I'll post a pic on my thread at the next stage. Thanks again for the help and idea!
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  #22  
Old 07-16-2009, 11:45 AM
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Default Re: Round foundation help

Tony,

In the unlikely event that you are wondering whether your concrete columns will support your oven, this video might prove reassuring: Concrete Crusher vs. Concrete Is As Entertaining as You'd Expect - Concrete crusher - Gizmodo

(This is really just an excuse to post a video of something exploding.)
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  #23  
Old 07-17-2009, 03:24 PM
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Default Re: Round foundation help

David,

Great video! On my next build I'm definitely going with one column.

SONOTUBES RULE!
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  #24  
Old 07-27-2009, 10:35 AM
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Default Re: Round foundation help

Tony, I will be following this thread closely as I'm also interested in the tri-tube support design.

Neil, I also found your 'Flying Saucer' thread. Went through it with great interest. I love the simplicity of your overall design. Very nice work!

Last edited by fxpose; 07-27-2009 at 10:57 AM.
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  #25  
Old 07-27-2009, 11:50 AM
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Default Re: Round foundation help

I'm halfway through my second summer and having a lot of fun with it. From the oven shown in the "Flying Saucer" thread, I did make a few changes after the first year of use. I cast and installed a slightly longer counter top because I was not happy with the finish I got with the first one (It was well below 32 Fahrenheit when I cast the first one and I think I got some freezing and thus it ended up spalling a bit).

I also replaced the original vent chimney with a double walled one.

This is what it looks like now.
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Last edited by Neil2; 07-27-2009 at 11:54 AM.
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  #26  
Old 08-10-2009, 05:35 PM
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Default Re: Round foundation help

fxpose,

Sorry I haven't responded. I've been in Europe for the past three weeks. Hopefully i can post some pictures this weekend and get started on the hearth.
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  #27  
Old 08-18-2009, 03:56 PM
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Default Re: Round foundation help

Today i bent my 1/2" rebar coming out of the sonotubes. Made a grid of 1/2" rebar spaced 10" apart on top of the rebar coming out of the tubes. Should have taken a photo. Made sure the rebar was at least 4" from the walls. (Needed an acetylene torch to bend the rebar). Poured my cement.

Now i need to decide if i should go with vermicrete or fireboard.
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Round foundation help-dsc02608.jpg   Round foundation help-dsc02609.jpg   Round foundation help-dsc02611.jpg  
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  #28  
Old 08-18-2009, 05:30 PM
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Default Re: Round foundation help

Looking good Tony.

The rebar from the tubes bending into the slab is mainly for "punching shear". Your 3 x 1/2 rebar at each tube should be more than adequate for that.

If you are going with the vermiculete I have a suggestion. Step your next form in 2 inches or so from edge of the slab. Don't daylight the vemiculete layer. You can then step back out and fill this 2 inches with concrete, forming a "belt" containing the vermiculete. Run a couple of reinforcing wires around inside the belt and form some vertical groves every 18 inches or so to control cracking.
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Last edited by Neil2; 08-19-2009 at 08:59 AM.
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  #29  
Old 08-18-2009, 05:33 PM
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Default Re: Round foundation help

Thanks for your reply Tony. Now that's looking really good!!
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  #30  
Old 08-28-2009, 04:07 PM
tony boca's Avatar
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Default Re: Round foundation help

Neil,

How did you draw your elipse? I have a 21" radius and I think I'm going to cut my soldiers at 21 degrees and aim for an 18" height dome. But, I'm having trouble drawing the eliptical plywood template. Any suggestions?
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