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-   -   Is this a senisble way to 'flatten' and arch? (http://www.fornobravo.com/forum/f28/senisble-way-flatten-arch-4374.html)

Puy de Dome 06-23-2008 10:40 AM

Is this a senisble way to 'flatten' and arch?
 
Long story short... was going to build a barrel shaped oven, then after reading stuff here I decided to build a domed oven - the Pompeii one.

Anyway, so I ring my nearest supplier - 100 miles away and am told that they sell firebricks to create a dome.

So I get there...

Uh uh, what is a dome to the supplier is a barrel to me... see this pic:

http://i194.photobucket.com/albums/z...1860Medium.jpg

These bricks are shaped to create an arch...

BIG question: can I widen this arch, SAFELY, by inserting another ordinary brick in between?

See this pic:

http://i194.photobucket.com/albums/z...1864Medium.jpg

I would use a former anyway to build this, but now I am back to building a barrel shaped oven, for better or worse, but it's a fair bit narrower than it would have been if it was a normal dome.

What would you do? Put up with the reduced width (still got the length), or try to widen the arch?

Would it work? Please help.

PdD

dmun 06-23-2008 11:02 AM

Re: Is this a senisble way to 'flatten' and arch?
 
1 Attachment(s)
Guessing from your picture, 16 taper bricks form a 20 inch internal arch, is this correct? (see enclosed sketch)

What are the dimensions of your full size and thin bricks?

What is the target size of your dome?

Puy de Dome 06-23-2008 01:20 PM

Re: Is this a senisble way to 'flatten' and arch?
 
Yes, the internal measurement is a fraction over 20".

The full size bricks are:
4.5" x 3" x 9"

The thin ones are:
4.5" x 1" x 9"

The wedge shaped bricks are:
3" at the widest point
2" at the thin end
4.5" along the side between these two
9" in length

I have a maximum diameter of 42" to span - anything within that would be cool.

PdD

dmun 06-23-2008 03:36 PM

Re: Is this a senisble way to 'flatten' and arch?
 
1 Attachment(s)
This drawing shows a four inch vertical soldier course, with two rings of taper bricks, followed by a single ring of the three-inchers. It stays pretty close to the semicircular shape, until it gets to the center when all bets are off. Unless you are planning a cut-every-brick perfect fit dome, there's not much advantage in using the taper bricks. I know around here they're a lot more expensive. They would, however, make a great entry arch, as superimposed on the front.

CajunKnight 06-23-2008 04:16 PM

Re: Is this a senisble way to 'flatten' and arch?
 
Draw out the size and shape you intend for you dome on cardboard or whatever. Lay it on table and lay out bricks. You may have to add straight bricks here and there to get the size and shape you desire. You may have to add a shim to outside face of bricks sometimes, just keep interior brick faces close as possible. It helps to see what you need to do. Now trace the bricks with description of each and keep as a guide.

Puy de Dome 06-23-2008 09:49 PM

Re: Is this a senisble way to 'flatten' and arch?
 
Thanks both.

So technically, and within the laws of physics/gravity, would the dome stay together?

It appears that using three, say, standard bricks in the centre of the arch is asking for trouble, because they appear t be able to drop down.

Or is it simply the case that the taper bricks either side act in a sideways movement to hold all bricks together?

If so, then this is going to be the way to go to get the width.

PdD

dvonk 06-24-2008 01:21 AM

Re: Is this a senisble way to 'flatten' and arch?
 
If you are building an arch (not dome) two flat bricks together is not good from my point of view. I wouldn't do that at least.

Puy de Dome 06-24-2008 02:40 AM

Re: Is this a senisble way to 'flatten' and arch?
 
Dvonk - I'm inclined very much to agree with you on that.

However, I do think that the second image Dmun attached looks promising - two tapered bricks followed by a straight one, then two more tapers etc.

To my mind, this effectively elongates the tapers.

PdD

dvonk 06-24-2008 03:03 AM

Re: Is this a senisble way to 'flatten' and arch?
 
1 Attachment(s)
Yeah.
Most of all I didn't like the image of two flat bricks on the top of arch. But tapered-straight-tapered in any combination should work, I guess.

I even made a couple of semi-taperd bricks - just around the keystone.

Puy de Dome 06-24-2008 03:53 AM

Re: Is this a senisble way to 'flatten' and arch?
 
Think I'll go for it.

Thanks.

PdD


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