#11  
Old 09-23-2012, 02:56 AM
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Default Re: Arch Design Help

Quote:
Originally Posted by Les View Post
Laku,

I don't follow the "weak" issue. Many ovens have this approach (mine included ) and there is absolutely no problem - what am I missing?
Well if you think about the forces and how they distribute in the structure it seems pretty obvious to me. The unsupported ends on the vent hole will want to move towards the empty space and that will cause a twist that will make the front arch want go away from the oven. See the picture, red arrows are the directions those bricks will want to move (at least how I understand the forces).

But as said it might be a no issue with the weights we are talking about in here. All the same it is a weakness in the design as far as I can reason it. (please do correct me if my reasoning is flawed )
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  #12  
Old 09-23-2012, 03:09 AM
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Default Re: Arch Design Help

All arches want to do is lay flat on the ground, you have to address the outward forces with addition weight to stop it from happening.
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  #13  
Old 09-23-2012, 01:23 PM
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Default Re: Arch Design Help

I think (?) there are numerous ovens on the site built with arches exactly like the drawing, and I haven't heard about any arch collapses.

But to your point - the thing to do to avoid the issue you raise would be to construct the inner and outer arches at the same time, and stagger the full bricks across both arches so as not have that potential plane along which the front arch could crack away from the back arch.

To Al's point, a buttress may be a more important thing to think about given the downward pressure on the arch pushing the sides out.

I also think you could tie the two arches together across the top with your chimney transition - creating a more solid connection between the two. That's not yet in the drawing
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  #14  
Old 09-25-2012, 08:33 AM
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Default Re: Arch Design Help

Well, over the weekend I did a little redesigning, but I guess I should have stayed tuned in to the thread. Anyway, if you would, take a look at the attachments and let me know what you think. I will post additional pics in a separate post.

Some of the things I did are:
Captured the end bricks of the vent opening.
Added a Smoke Box.
Defined planar cuts on the arch bricks that interface with the dome bricks.

The dome base diameter is 42"
The vent opening is 7" x 12" (84 sq in)
The smoke box has a cross section of 9.75" x 16.25" (158 sq in)

Thanks for your input.
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Arch Design Help-arch.jpg   Arch Design Help-arch2.jpg   Arch Design Help-arch-row1.jpg   Arch Design Help-arch-row2.jpg   Arch Design Help-arch-row3.jpg  

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Old 09-25-2012, 08:34 AM
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Default Re: Arch Design Help

Additional design pictures
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Arch Design Help-arch-row4.jpg   Arch Design Help-arch-row5.jpg   Arch Design Help-arch-row6.jpg   Arch Design Help-arch-rows-smokebox.jpg   Arch Design Help-arch-smokebox.jpg  

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  #16  
Old 09-25-2012, 08:39 AM
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Default Re: Arch Design Help

On other thing. I allotting a gap of 3/8" for mortar joints. Is that about right?
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  #17  
Old 09-25-2012, 10:07 AM
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Default Re: Arch Design Help

Quote:
Originally Posted by Bob in Mo View Post
On other thing. I allotting a gap of 3/8" for mortar joints. Is that about right?
For regular masonry, 3/8" is standard. If you are tapering all your bricks my experience is that you probably won't use that much mortar - maybe 1/4". But there are probably many opinions on this

Nice CAD work on the mockups. That design looks good
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Old 09-25-2012, 01:47 PM
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Default Re: Arch Design Help

I really like the concept of a smokebox. With the added weight on top of your current straight-sided entryway, I would make sure to buttress both sides. Great graphics.
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Old 09-25-2012, 08:05 PM
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Default Re: Arch Design Help

Quote:
Originally Posted by Bob in Mo View Post
Additional design pictures
I like the "smoker box" that you have designed. I designed mine to taper in to the point where I transitioned to a damper and finished flue size. Let me echo GianniFocaccia, buttress .
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  #20  
Old 09-25-2012, 09:32 PM
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Default Re: Arch Design Help

Hey Gulf,
I'm really curious: does your damper affect the draw of your flue sufficiently to control the rate/intensity of an active fire?
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