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you can get floor joists top span 4.5m easy, you can also try posi struts or hybeams etc.

I would not think a tarp would hold much weight if a drunk person fell on it. A company called swim and sun safe in Moorabbin vic rent out timber covers for pools such as yours. You could also build a deck over the top. Knock a hole in the pool so the water drains. A deck should not cost you...