Backyard Aquaponics
A place to discuss aquaponics

Ehh scrap, hmmm. I know where there is some old rialway track know that you mention it.

What I was thinking though was building my second system.

The plan for the outdoor system was/is to have a GB around the outside of the GH with insulated floor and sides. A Deep GB full of Gravel along the side of the tank should buttress it and prevent it from tippdown the hill. Espeacially if I make the GB so that the base is wider than the top and it is leaning up the hill.

What do you reckon?

Stuart
Thrust or pressure in water is exerted perpendicular to the angle of the sides.

I'd go with vertical sides rather than sloping like that. Easier to brace and no real advantage (water pushes just as hard no matter what the angle - what sleepe said).
I think the gravel would help support the fish tank. But get some proper structural advice before you build it. Make sure that it's braced enough, and that it won't slide down the hill under its own weight!

Sorry stuart but engeneering put into practice is the gb narrower at the top wont make eny difference the weight has gravety pulling it down i think as obo and roup said you will have to drive more verticle up rights both sides and ty them accross the top, Actually pine poles would be better

The inward sloping angle was for the gravel to act as a buttress. Yes in terms of the water the angle would be useless but I wouldn't be worried about the water pressure in the GB because it is relatively shallow (to the FT).

The GB in the GH have shown no signs of bowing but I'll tie them accross the top (like FnF suggested when he visited) just to be sure. In the FT's case its that extra 40cm of depth that has shown the inadequacy of the design.

This is the only way I think that adding extra suports at the side would work.



My reasoning is that its not the bottom thats going nor are the sides separating (bowing out). The tank is leaning over and unless big poles in deep holes most likely with concrete employed then I'm going to continue having the same problem.

Good for hanging shade off

How about this one?


Star pickets to support the side of the GB horizontal ties, from FT wall to outside GB wall to stop the sides of the GB bowing and then diagonal bracing from top of FT to outside edge of GB.

If the gravel dosn't hold it all the weight/force is going to be transferred to the top of the outside wall of the gb, which is its weakest point.

Just to make a point so that I appear less silly.

I had put off filling the FT until my pump had arrived so that if there was a problem I could empty it in a hurry.

Glad I thought ahead would have been bad other wise.

Bearing in mind I have had more training as an Ecologist than as an engineer put if the uprights are say star pickets and the truss is F7 equivilent put together with 14g Bugle screws is it going to be enough.

If not or if maybe what is a better solution?

Bearing in mind I have had more training as an Ecologist than as an engineer put if the uprights are say star pickets and the truss is F7 equivilent put together with 14g Bugle screws is it going to be enough.
probley not .If you like when i am coming back from the market sunday i will call in

I'm not an engineer either Stuart, I have had a lot of failures though .
I would not put any more weight towards the slope, brace the centre sides with something substantial concreted in

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Not a good angle but doing with characters isn't easy.
And settle for 80 cms deep

Unfortunately I'm in Brisbane this weekend.

On another note I've had Eadweard home for four nights in a row this week

I have been trying to post this for days but hopefully this time it works.

Decided to go for the simplest way to fix the side of my tank that would work rather than trying to fin dthe "best" way. Thinking too much about this whole deal has been one of the reasons it has taken me so long.



Each brace is secureed underneath the rail on the FT wall (9mm bolt) and at the other end by 14g screws through the top end of the 2' star picket. In addition I've attached a block of wood to the end of the brace that rests aggainst the SP so that the screws are not taking all the weight. I was worried that the sharp edge of the hole through the SP could shear through the shank of the screw.

Good enough you think?