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Sonotube stand... Opinions needed - Forno Bravo Forum: The Wood-Fired Oven Community

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Sonotube stand... Opinions needed

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  • Sonotube stand... Opinions needed

    I decided to build a small oven in a tight nook located just outside of the kitchen as my current concrete patio & planned WFO build has been put on hold for now.

    I plan on pouring a smallish 48" round hearth over sonotube columns. I do not wish to break the tiles to expose the concrete slab underneath, as some day this oven may have to be removed from this location, thus the reason for going with concrete legs. There will also be a layer of felt paper between the bottoms of each column and the tiles underneath to prevent bonding.
    However, I will drive 1/2" pins into the tiles and down into the slab for each tube column to prevent shifting in case of an earthquake.
    I might also cut some construction joints in the slab at grout lines and regrout.

    The question I have is whether to go with 3 tubes or 4 tubes. Each tube will be about 30" tall. Four columns are definitely more secure with almost no chance of a tip over, plus the weight will be distributed over a wider area in that corner of the nook.
    But I prefer the look and the simplicity of using just three columns. My only concern is a tip over as the legs will not be truely anchored to the floor, just pinned. But with each 8" tube just 30" tall this may not be a problem. I don't know. I can spread the legs wider apart from one another, bringing them even closer to the round perimeter edge.

    The sonotubes pictured below are not cut down to length so they look rather long, skinny, and unstable, holding up the 48" round plywood which I will use as form. The wine bottles indicate oven opening.

    Which do you think I should go with?
    Attached Files
    George

    My 34" WFO build

    Weber 22-OTG / Ugly Drum Smoker / 34" WFO

  • #2
    Re: Sonotube stand... Opinions needed

    BTW, that nook has always been my hibachi/bbq area......but not any more...
    Attached Files
    George

    My 34" WFO build

    Weber 22-OTG / Ugly Drum Smoker / 34" WFO

    Comment


    • #3
      Re: Sonotube stand... Opinions needed

      I think either plan will work: come a major oven-tilting earthquake you'll have worse problems than re-assembling the oven. I do see a problem getting your chimney two feet above anything within ten feet: that looks like a tall wall it's placed up against.
      My geodesic oven project: part 1, part 2

      Comment


      • #4
        Re: Sonotube stand... Opinions needed

        Thank you. Yes, I plan on using a 6" stove pipe straight up, secured with a couple of braces along the way to the top.

        As far as tipping, I was more concerned with someone leaning up against the oven. Or perhaps I'm being overly cautious. Center of gravity will be low too, I suppose.
        Last edited by fxpose; 04-02-2010, 11:53 AM.
        George

        My 34" WFO build

        Weber 22-OTG / Ugly Drum Smoker / 34" WFO

        Comment


        • #5
          Re: Sonotube stand... Opinions needed

          Hey FX,,
          Sounds pretty solid with either 3 or 4 legs, Im sure your gonna end up with a TON of concrete and brick.. Will you rebar the top slab to the legs ?? You could also put a few straps from the slab to the house to make you feel more secure,,
          Good Luck
          Mark

          Comment


          • #6
            Re: Sonotube stand... Opinions needed

            Mark, I decided to use just 3 legs and yes they will be tied to the top slab. But I will pass on the strap idea. Also, the pin beneath each leg will prevent the unit from shifting (during an earthquake) as that entire corner is well pitched toward that little drain hole.

            I had to convince my wife that this entire unit (weighing about a ton) can be picked up and moved elsewhere if need be. How, I don't know...except by crane I guess... She didn't like the idea of a massive concrete/stucco structure sitting in that tight corner, which I tend to agree with.

            Anyway, this spot was never my ideal choice for a WFO to begin with. But under the circumstance I really don't have another practical spot and I'm in desperation of building an oven ASAP. Therefore, I'm going to go ahead with it and keeping the entire enclosure within the 48" diameter, including the vent and arch. I'm thinking that might yield about a 32" max oven size.
            George

            My 34" WFO build

            Weber 22-OTG / Ugly Drum Smoker / 34" WFO

            Comment


            • #7
              Re: Sonotube stand... Opinions needed

              Three legs is "statically determinate". With four legs, one will have little or even negative loading and cracking is more likely.

              I would strongly recommend lifting some tiles and extending the concrete legs down a couple of feet into the sub grade. If the holes you dig are firm and not falling in, you can fill them directly with concrete without sonotube support. Just use the sonotube where it will be visible.

              http://www.fornobravo.com/forum/21/f...er-3033-2.html
              Last edited by Neil2; 04-03-2010, 02:47 PM.

              Comment


              • #8
                Re: Sonotube stand... Opinions needed

                Thank you for your sound advice Neil. Any advice is much appreciated.

                I actually went ahead and poured the tri legs over the tile today. My rationale for this is that Forno Bravo sells their beehive ovens with metal stands which can be placed practically anywhere with all that weight, similar to what I'm doing with my 'free standing' concrete stand, except that my stand plus the oven will weigh a few hundred pounds more.

                I will post pics tomorrow.
                George

                My 34" WFO build

                Weber 22-OTG / Ugly Drum Smoker / 34" WFO

                Comment


                • #9
                  Re: Sonotube stand... Opinions needed

                  I drove 1/2" rebars 5" deep through the tiles. I did not hit any dirt while I was drilling which was a good sign that the slab underneath the tiles were at least 4" thick.

                  The tubes were cut down to 29", plumbed, concrete poured, and rebars inserted. This was a very quick job as only 3.5 90lb bags of concrete were used.
                  Attached Files
                  George

                  My 34" WFO build

                  Weber 22-OTG / Ugly Drum Smoker / 34" WFO

                  Comment


                  • #10
                    Re: Sonotube stand... Opinions needed

                    Looking forward to seeing your build progress. I think it is going to be a nice compact solution to your site and somewhat unique oven.

                    Comment


                    • #11
                      Re: Sonotube stand... Opinions needed

                      Thanks Neil, I already have a very simple enclosure design in mind (and on a few napkins). But the most challenging aspect of the build will be the very shallow entry/vent area while trying to fit as large an oven that I can fit within the 48" round enclosure diameter.
                      George

                      My 34" WFO build

                      Weber 22-OTG / Ugly Drum Smoker / 34" WFO

                      Comment


                      • #12
                        Re: Sonotube stand... Opinions needed

                        Hey F
                        I think you came up with a great compromise here,, Looks like it will be solid and big enough to be functional as well.. I guess now we wont have to wait as long to see your oven being built,,
                        Cheers
                        Mark

                        Comment


                        • #13
                          Re: Sonotube stand... Opinions needed

                          I built and set the form, and poured the 48" round slab today.
                          Attached Files
                          George

                          My 34" WFO build

                          Weber 22-OTG / Ugly Drum Smoker / 34" WFO

                          Comment


                          • #14
                            Re: Sonotube stand... Opinions needed

                            Nice work. When you have finished the oven, you are going to need a fourth sono tube to support your concrete counter top (one edge sitting on the slab) like this:
                            Attached Files
                            Last edited by Neil2; 04-08-2010, 08:54 PM.

                            Comment


                            • #15
                              Re: Sonotube stand... Opinions needed

                              Thanks Neil, I saw how you set your counter and it seemed very practical. I like your set up very much. But in my situation I have absolutely no space there to build a permanent counter of practical size. But I will try to come up with a solution as the oven build progress.
                              George

                              My 34" WFO build

                              Weber 22-OTG / Ugly Drum Smoker / 34" WFO

                              Comment

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