Want to build a 2-legged bench (sunken 4x4's w/ a 4x6 top, w/ perpendicular 2x8's), unsure if safe..

Discussion in 'Stands' started by SU2, Oct 12, 2017 at 3:06 PM.

  1. SU2

    SU2 Shohin

    Messages:
    307
    Location:
    FL Gulf Coast 9a/9b
    I'm really on the fence about building this thing... I was very inspired by c54fun's (can you tag users on this board?) benches & monkey-poles that he posted mid-page here: https://www.bonsainut.com/threads/s...-so-you-can-get-more-vegetative-growth.29236/

    My problem is, I'm afraid that what I intend to build won't be sufficiently stable with the weight of the wood + trees, am here hoping for opinions to confirm/deny my fear!

    The idea is to use (2) 4x4"s for the legs of the stand, each sunken in-ground as deep as the pole-hole cutters let me get (around 3' I think?), back-filled with rocks and tamped-down. These 4x4's would be placed 4' apart. I'd then place the 8' long 4x6" on top of the two 4x4's, and screw it down into them, leaving me with a long 8' bar upon two 4x4 posts (with the 4x6" being around 3' tall / off the ground) I'd then cut (12) 2'-long sections of 2x8 and fix them perpendicular to the 4x6, so I'd end up with an 8' long, 2' wide 'table top', each of the 2x8's across the top will have (3) screws into the 4x6 so should be solid as far as lateral pressures, my concern is with the structure itself, if (2) 4x4's is enough to be solid with all this (at ~3' depth, w/o concrete footing), the total weight is the trees on it, an 8' 4x6, and 24' total of 2x6"...

    Maybe I'm worrying for nothing, would just like some opinions on whether this is a solid build or not! Would be using 3-4" decking screws probably #6 or #8, drill pilot holes/properly level/etc (ie it's not the first thing I've built ;P )

    Here's the entirety of it except a 4x4 (one 4x4 is on the left, the 2x8's for the (12) slats that'd make the top are on the right, that's all the lumber only a little of those 2x8's will be excess/unused)

    19700116_191406.jpg

    I'd originally planned to paint this, and my two benches, all the same color - have since learned of a 'burnishing' technique that may see me pressure-washing and then burnishing the wood with a torch, still need to learn how far propane goes when used that way, my trials weren't very efficient!
     
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  3. Bonsai Nut

    Bonsai Nut Administrator

    Messages:
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    @SU2 I think you would be better off with (2) 2 x 6 x 8' as your cross members between your two 4 x 4's. Like this:

    bonsai stand.jpg

    If you sink those 4 x 4's three feet into the ground and back fill them, they aren't going anywhere. Just use treated lumber so they don't rot... If you find that it still moves too much for your liking, you can always brace the legs at the ground level.
     
    Last edited: Oct 12, 2017 at 5:07 PM
    SU2, Underdog, clevetromba and 3 others like this.
  4. Bonsai Nut

    Bonsai Nut Administrator

    Messages:
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    Location:
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    By the way, since you asked, to tag someone in one of your posts, simply put the "@" in front of their user name... like:

    @SU2
     
    SU2 likes this.
  5. Vin

    Vin Masterpiece

    My thoughts exactly. Another option would be to ad a 4 x 4 to each end near the outer edges.

    DSCF2430.JPG

    DSCF2431.JPG

    DSCF2458.JPG
     
    SU2 likes this.
  6. clevetromba

    clevetromba Mame

    Messages:
    231
    Location:
    Cleveland Ohio USDA Zone 6a
    This technique is called Shou sugi ban. It is typically done on western red cedar, or Japanese cedar. What type of torch are you using? I would recommend a weed burner type torch with at least a 20 lb tank. It will go quickly that way, and the larger tank size won't ice up as fast as a smaller one. After burning it, you should coat the wood with linseed oil.
     
    parhamr, NorthTXacer and SU2 like this.
  7. clevetromba

    clevetromba Mame

    Messages:
    231
    Location:
    Cleveland Ohio USDA Zone 6a
    Cool design. If I knew I was staying put for a good long time, I think I would build a few of those.
     
  8. SU2

    SU2 Shohin

    Messages:
    307
    Location:
    FL Gulf Coast 9a/9b
    I really like that build, in fact it's identical to one someone linked me from another board (a youtube video of someone making one of those), unfortunately this is going to be a 'what's on-hand' project, have too much lumber to make-use of!

    Am going to do 3' and back-fill with some rocks in there, I figure I can stress-test it after and, if it's not to my liking, I'll take it out and backfill with concrete!

    (thanks for the help on tagging people btw!)

    Yeah I'd gotten paint but am now wanting to do this, unfortunately I did a section with my blue propane can-torch (the ubiquitous, ~1' tall can with brass nozzle) and with how small a tip the fire is it took a lot of gas just to finish a small section, if I'm to do >20' linear of benches that could add-up to a lot of propane!!
     

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