Hello.
I have now tried to read up on something, but it's not going so well :P

I have a steel frame pool with a volume of 7250 liters. I can't dig where it will stand because the ground is filled with all sorts of things from 1-ton stones to various toilet brushes, gutters, and cables that people thought were a good idea to fill with in the early '70s. So I threw together a small wooden deck on the ground with 45x145 joists at 60cm centers. Maybe 12-16 supports because the ground is not completely level. 28x120 decking on top. Then foam and a tarp. But the more I think about it, the more doubtful I become about it holding up.
Should I reinforce it even more and add more supports? I don't really understand the load-bearing aspect of a deck.
Dimensions:
The deck 3x4.8m
Pool 2.5x4.25m.

The whole thing is standing from 0cm to maybe 15-20cm off the ground.

If I've managed to calculate it right, it means I have a load of about 725kg/m².

Is there any kind soul who can just quickly explain how I should do it?
The construction itself is not a problem. Just the measurements and dimensions :)
 
The decking boards can handle the load, but to be able to calculate your joists, you need to know their maximum span.
 
The span is probably one of the things I want to know. I'm considering having a span as small as possible. I think the span is about 1-1.2m right now. Didn't measure it that carefully.
 
With 1.2 meters, 45x120 C 24 is sufficient. If you go down to 1 meter, 45x95 C 24 will suffice. However, the latter usually does not have NTR/A quality impregnation, which is suitable.
 
May I ask how you know what is enough? Is there perhaps a table somewhere?
 
By calculating it using the theory of elasticity. It is primarily the deflection that must be limited.
 
There are tables for certain situations and even free apps, but they are hardly useful for such a special application.
 
Then I thank you very much for the help.
 
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