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Steel Tank Underground Anchoring Detail to Foundation

Steel Tank Underground Anchoring Detail to Foundation

RE: Steel Tank Underground Anchoring Detail to Foundation

(OP)
extra question.. computing the uplift FS on the footing..

F.S. = weight of concrete/(buoyant force footing + buoyant force tank)

OR

F.S. = weight of concrete/buoyant force footing only

RE: Steel Tank Underground Anchoring Detail to Foundation

The footing should be heavier than the soil (i.e. negative buoyancy), which I'm sure is what you meant in any case. But the footing should engage a wedge of soil related to its angle of internal friction, so you can make use of that as part of your restraining force.

RE: Steel Tank Underground Anchoring Detail to Foundation

Simply some form of nylon, non rotting or corroding straps. don't forget all the metallic components involved should be stainless or galvanized.

Given you're fixing the tank to the base, the uplift force is base plus tank. This can quite considerable.

Alternatively build a frame around the tank and pour concrete in when the tank is full of water (otherwise it will collapse).

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Steel Tank Underground Anchoring Detail to Foundation

For a tank in that configuration, anchor bolts and chairs around the bottom of the shell would normally be used. Alternatively, welded anchor straps could be used.
In either case, the tank has to be designed for external pressure due to soil and liquid loading, and if it is very big, that becomes a problem.

RE: Steel Tank Underground Anchoring Detail to Foundation

(OP)
@littleinch,

since bottom of tank is flushed with top of footing, should't total bouyant force is = footing area x depth of water table x62.4 ?

i can understand, tank + footing buoyant force, if the tank has legs and not flushed with the top of footing?

RE: Steel Tank Underground Anchoring Detail to Foundation

ACE Tank used to have a standard detail for this situation.

Mike McCann, PE, SE (WA)


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