Concrete Wet Well Reinforcement Design

[Joncrete]

Hi,

I need guidance on the Reinforcement Design of a Concrete Lift Station. I'm not a structural engineer, and do not have the proper software to do this design, so I just wanted to get an idea of what kind of Rebar Schedule you guys typically require. Any help would be greatly appreciated. Here are the details:

Normal Weight Concrete

10'8" Square x 23' Deep (Inside Dimensions)
16' Square x 12" Thick Base Slab
12" Walls
8" Lid w/ 67" x 101" Access Hatch

Here is what I had in mind, but I could be way off:

Base Slab: #4 @12 OC EW Double Mat
Walls: #5 @ 9" OC EW
Lid: #5 @ 9" OC EW

Thanks!

 

[JedClampett]

Even though this is a relatively small structure, you really should have a structural engineer either do it or guide you through it. And no software can provide proper reinforcing details.
Now I can get off my soapbox. You didn't say anything about external soil loads. That's likely to control. Usually a box of that size can get away with minimum ACI bending reinforcing (rho=.0033). You need to make your base thicker. if the walls are 12 inches, the base should be at least 2 inches thicker. And the base reinforcing does not meet ACI minimum for bending. It's not clear if you have two curtains of wall reinforcing. You should.
A eight inch thick lid is a little scary, especially for traffic loads.

 

[Joncrete]

Thanks for your input, we do plan on having a Structural Engineer design the reinforcement, this is kind of just preliminary budgetary type design.

Good idea on the thicker base slab, we will go with a 14" slab.

The Lid Slab can go thicker, maybe 12"? But there will not be any traffic loads.

I don't know enough about the external soil loads at this site. At this point, we should probably look at relatively high soil loads.

Thanks again for your help.