#1  
Old 08-20-2007, 04:05 PM
SuperT's Avatar
Serf
 
Join Date: Jul 2007
Location: Canada
Posts: 22
Default Arch to Dome Transition

I am really nervous about the next few courses of brick. I am at a loss for how to connect the chains to the arch. To make the arch, I took the half bricks and cut them in half to make this so in essence, the arch you see in the pic below consists of 2.25" x 4.5" bricks laid horizontally against the form. Not understanding the physics behind this I am really nervous about the weight of the chains coming above the arch and what will they have to hold on to? I just can't imagine that arch holding any weight. Should I take it down and start with angle iron...its just I really like the look.

Any expertise would be greatly appreciated.

Tony
Attached Thumbnails
Arch to Dome Transition-picture-007-small-.jpg   Arch to Dome Transition-picture-008-small-.jpg  

Last edited by SuperT; 08-20-2007 at 04:16 PM.
Reply With Quote
  #2  
Old 08-20-2007, 05:06 PM
Journeyman
 
Join Date: Oct 2006
Location: Adelaide, Australia
Posts: 257
Default Re: Arch to Dome Transition

Tony,

I'm nearly at that stage too, and recommend you have a look at the thread at http://www.fornobravo.com/forum/f8/c....html#post9764 (Connecting front to dome) - there are some good suggestions on this topic.

Balty Knowles used longer dome bricks to meet up with the arch, and some Dutch dude used longer arch bricks (there is a URL listed, but the English translation doesn't seem to work any longer). Both methods seem to achieve a similar result.

Or you could develop a 'teardrop' shape at the front of your dome to enable your dome bricks to meet up with the arch.

Perhaps some more experienced builders could weigh in here.

Good luck,
Paul.
Reply With Quote
  #3  
Old 08-20-2007, 06:34 PM
Dutchoven's Avatar
Master Builder
 
Join Date: Apr 2007
Location: Mississippi
Posts: 931
Default Re: Arch to Dome Transition

My concern with this arch is with the thrust from the bricks in the dome. When you are laying the brick on the thinner side called "shiners" in an arch the arch has to be very well designed and set because the line of thrust has to stay in the middle third of the bricks. in the case of a 2.5 in thickness you have .8 of an inch to play with. You might consider mitering the doorway bricks to match the angel of the bricks in the bottom couple of courses and continue on the same miter and you will have an angled siet of arch brick to transition the dome rings onto. Some masons even double the miter on the higher bricks in the doorway arch to smooth the exit of gases from the oven, in that case the bricks will have somewhat of a point. I know it is hard to describe in words but, your arch will be more stable if you lay the bricks on the wider 4.5 inch side.
I will see if I can take some pictures for you to give a better idea of what I mean.
Best
Dutch
__________________
"Making the simple complicated is commonplace; making the complicated simple, awesomely simple, that's creativity. " Charles Mingus
"Build at least two brick ovens...one to make all the mistakes on and the other to be just like you dreamed of!" Dutch
Reply With Quote
  #4  
Old 08-20-2007, 07:17 PM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: Arch to Dome Transition

I second Dutchoven's suggestion that the bricks laid on their narrow side means it's a little too weak. You don't have a side view, but I suspect the bricks don't go back very far, and remember that the oven curves in strongly at that point. You might consider re-doing your arch with a hollow form that you can leave in place until the dome is completed, and laying an arch with deeper bricks, laid on edge rather than face.

Remind us again, what mortar are you using?

My personal preference: I don't like angle irons. I think the huge difference in expansion between brick and iron makes that a weaker choice than even an indifferently built arch. That said, there are lots of successful ovens with angle irons.
Reply With Quote
  #5  
Old 08-22-2007, 06:51 PM
SuperT's Avatar
Serf
 
Join Date: Jul 2007
Location: Canada
Posts: 22
Default Re: Arch to Dome Transition

So TEAM FORNO

After reviewing Balty's as well as the German page I couldn't read, I thought, what if I take the water saw or my angle grinder and using a whole brick on edge, fit it onto the arch bricks where the chains join and then have the other side sloped on the angle of the next chain. Kind of a hybrid of Balty's and German Dude...It might not be the prettiest, but that part will be covered anyways?

See my diagram...am I on the right track?

Tony
Attached Thumbnails
Arch to Dome Transition-arch-fix.jpg  
Reply With Quote
  #6  
Old 08-22-2007, 08:00 PM
maver's Avatar
Master Builder
 
Join Date: Aug 2006
Location: Puyallup, WA
Posts: 571
Default Re: Arch to Dome Transition

I think that would work if this doesn't push the arch too far into the oven - you may need to do less than full length bricks in the middle with full length on the sides due to the curve of the dome away from the arch. If you stagger the joints rather than placing it directly over the first chain of arch bricks it should be stronger. Your idea saves you having to rebuild the arch, but that's extra cutting. I think building an arch is more challenging though. You will be able to see the seam on the underside of the arch - it will look like a double arch, but you don't have to tell anyone why it's there and can instead just tell them that a single arch did not pose the required degree of difficulty.

Marc
Reply With Quote
  #7  
Old 08-23-2007, 05:57 AM
SuperT's Avatar
Serf
 
Join Date: Jul 2007
Location: Canada
Posts: 22
Default Re: Arch to Dome Transition

I like that :-) extra difficulty; as if I needed any...I drew out the principle but like you said, I'll have to cut to fit to make sure the dome curve is maintained in the middle as opposed to the sides and did plan to stagger them. I'll let you guys know how it turns out.

Thanks
Tony
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
dome rings combining with chimney brick smithgardens Pompeii Oven Construction 5 12-24-2009 01:18 AM
A Potential New Low Dome Design james Pompeii Oven Construction 17 08-14-2008 12:44 PM
Very Interesting Arch transition Design Unofornaio Pompeii Oven Construction 8 08-29-2007 06:12 PM
Dome To Door Jamb Transition Hendo Pompeii Oven Construction 1 08-23-2007 05:52 AM
This is fascinating - the catenary arch Fio Pompeii Oven Construction 2 06-19-2006 11:08 AM


All times are GMT -7. The time now is 05:38 PM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
© 2006/10 Forno Bravo, LLC