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-   -   Please help???? Possible problem in my design. (http://www.fornobravo.com/forum/f8/please-help-possible-problem-my-design-17741.html)

tagertim 05-14-2012 09:26 AM

Please help???? Possible problem in my design.
 
3 Attachment(s)
So I might have a problem that I may need to correct before I go any further. I was hoping to get some advice from the community. It was pointed out to me that my inner arch is too far out and could cause it to push outward from the weight/pressure of the rings. Can anyone comment on this?

Thanks a bunch,
Tim

GianniFocaccia 05-14-2012 10:21 AM

Re: Please help???? Possible problem in my design.
 
I don't think it will be a problem. In fact, the vault (dome) shape at the inner arch is closer to a catenary arch than the rest of the dome. A large number of builders have experienced this and some choose to gradually bring the dome back into round, others not. It doesn't really affect the performance of the oven.
John

tagertim 05-14-2012 10:52 AM

Re: Please help???? Possible problem in my design.
 
John, you don't think this will cause structural problems?

Tscarborough 05-14-2012 11:07 AM

Re: Please help???? Possible problem in my design.
 
It shouldn't be a problem, you should add some buttressing to arch though.

GianniFocaccia 05-14-2012 11:54 AM

Re: Please help???? Possible problem in my design.
 
No. You have no idea how many ovens I've seen on the FB site that look exactly like yours. I haven't heard any complaints of dome failure from oval or teardrop-shaped domes.

tagertim 05-14-2012 01:29 PM

Re: Please help???? Possible problem in my design.
 
Thanks for the info. Makes me feel a lot better about things. You don't know the stress this kind of thing can cause.

Amac 05-15-2012 03:10 AM

Re: Please help???? Possible problem in my design.
 
Tim
Quote:

Makes me feel a lot better about things. You don't know the stress this kind of thing can cause.
Sorry about that Tim. Now I feel bad for raising what appears to be a red herring - it was not my intention to cause any stress - and I am glad that the consensus seems to be that the structure is sound.

John (Gianni)
Quote:

I haven't heard any complaints of dome failure from oval or teardrop-shaped domes.
Just to be clear I didn't ever think the oval or teardrop shape is a problem. I was just under the (mistaken) impression that the arch attachment to the dome should either be of the "V" type (dome bricks wrapped around the arch bricks) or the angled type such as you, I and others adopted.
Aidan

Mike D 05-15-2012 08:30 PM

Re: Please help???? Possible problem in my design.
 
-So I see a different problem (sorry and I am just trying to help). But in the first picture you can see that your bricks don't rest on top of the arch, they just run/butt up next to it. I don't know if this is a problem, but they are not supported by the arch (at least not very well).

-With more weight on top of them I don't know how they will hold up.

-I have a slight teardrop shape to my dome but I was very careful of staying over the arch until I got over it and then made my correction.

-Then, how does it look when you remove the wooden door support to your arch? Can you see your dome bricks poking out?

Good luck (can any one see what I am talking about?)

Mike D

azatty 05-15-2012 09:48 PM

Re: Please help???? Possible problem in my design.
 
It looks like he beavertailed the dome a bit, but it's not critical. Remember that the thrust of the dome is downward and inward--the dome is literally collapsing in on itself toward the center of the oven, and that load is ideally transferred down along the cantenary curve. Once he adds the next course, the dome will be locked into the arch and the downward thrust will be transferred into the dome entry arch in that area. There's very little lateral shear being pushed into his arch, and the mass of the arch, landing, vent, and chimney will counteract it.

Amac 05-16-2012 04:11 AM

Re: Please help???? Possible problem in my design.
 
Mike D
Quote:

But in the first picture you can see that your bricks don't rest on top of the arch, they just run/butt up next to it. I don't know if this is a problem, but they are not supported by the arch ...
If you look at my original post this is the exact point I was trying to make in tagertims original thread - obviously not very well - since it was taken to be a criticism of the oval/teardrop shape. Note to self: "be more careful with phrasing":(
I thought that at heating up the dome would tend to push the arch outward but azatty seems to have answered the point pretty well though. Also I think the entry when it is complete will act as a buttress in that direction.


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