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Steel Grate for Detention Vault Lid

Steel Grate for Detention Vault Lid

Steel Grate for Detention Vault Lid

(OP)
Got a situation where the local fire marshall has specified that the access grate for a concrete detention vault needs to support the weight of a ladder truck outrigger pad.  

The pad generates a load of 45,000 pounds over a 5.5 square foot area, or about 8 ksf.  shocked

Aside from the steel support frame top be designed, does anyone know of any steel grating that is currently manufactured to handle this loading?  It is an exterior application in a traveled way.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Steel Grate for Detention Vault Lid

Mike:
Don't you mean grating on a gridwork of beams at 3 or 4' o/c, which can support 45k?  By the way who are they going to detain down there, so valuable that they need a vault?

RE: Steel Grate for Detention Vault Lid

(OP)
This is a stormwater detention vault and the grate is to be able to be removed in order to lower a small bobcat into the tank to clean it.  The opening is 5 feet by 15 feet.

The grating still has to span between the steel beams, so it will see the load, just like a concrete slab would.

Isn't structural engineering interesting?

 

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Steel Grate for Detention Vault Lid

Just a thought if you can't find appropriate grating -
How about some removable I-beams that could be bolted in  and removed when necessary.  Cover them with grating that will now span the lesser distance.

RE: Steel Grate for Detention Vault Lid

(OP)
That's what I'm looking for.  Thanks CTW.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

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