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#2
12-01-2009, 03:10 PM
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What kind of defelection are you going to get with an 8ft beam like that? i imagine standard design tolerance is greater than that for a big glass fish tank. it may hold it up but if the beam bends you won't be level and you'll get uneven loading in the tank (and on the beam).
Unless you're on the basement floor (or Concrete Slab) i would also suggest having someone look into your flooring situation. 2 four foot tanks and a 7 foot tank over the same joists is a boatload of weight... a quick guess is over 4000lbs.. not including any rock. or you standing over them to feed/clean/gawk... Last edited by Fishward; 12-01-2009 at 03:20 PM. 
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#4
12-01-2009, 04:40 PM
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Quote:
What does Gawking typically weigh?
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#5
12-01-2009, 05:30 PM
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Quote:
i imagine you could draw quite the crowd with about 400 Gal. of tank space in those 3 tanks. (which without rock/glass is already ~2 metric tonnes) add 400 lbs of LR/sand... 500lbs of glass... big numbers...
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#6
12-01-2009, 05:55 PM
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i am actually going to go with 3 x 3 by .375 inch because they dont have the .313. so I am going to go bigger vice smaller.
underneath there is 2 x 10's at a 12 foot span every 12 inches running in the same direction as the tanks. there is also a 2 foot retaining wall at the 6 foot mark running perpendicular to the joists with 2 x 12 foot pilings under that. One of the pilings is directly under where the tanks will be sitting. there is also 3/4 tongue and grove OSB flooring. I should be fine with the weight I think. I actually built it specifically for tanks to go there. however, they were going to go in the same direction as the retaining wall, but decided to put them all against the outside wall instead. it is alot of weight, but I think the saving grace is the 2 foot retaining wall at the halfway mark. I don't see how the 2 x 10's could really go anywhere with that there. opinions would be greatly appreciated. btw, as for gawking.....no comment on the weight issue...I am trying to lose a few lbs ok...lol thanks again Neal
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Way too much time and money has gone into this hobby....and yet, I CAN'T STOP Last edited by howdy20012002; 12-01-2009 at 05:58 PM.
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#7
12-01-2009, 07:42 PM
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My worry is that you will have the footings of this steel frame, holding up 3000lbs and hiting the floor at almost exact midspan of the 2x10s. (provided im understanding your geometry correctly). At a 12'' spacing of those joists you can, at best, hope to split that load over 2-3 of them. On top of the 2 tanks you have there already, i personally wouldn't trust it. Sphelps may be able to comment better on the numbers side (don't have any refence books on hand) but my gut says dont do it.
If you can, I would say make sure there is a support (concrete ideally, or cinderblock) directly under where your stand footing hits the floor, and join the 2x10s together to prevent any torsion. (12'' pieces placed between them)
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#8
12-01-2009, 08:02 PM
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I should note at this point that my advice is only relative to the steel structure holding the two tanks. I can't comment too much on the floor holding that much weight as there are way too many variables to consider. I assumed this was on a solid floor, you'll definitely need something above normal floor conditions to support the weight on a raised floor.
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