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Structure spec

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ohyne

Civil/Environmental
Joined
Mar 12, 2008
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2
Location
US
I'm designing a storm sewer system and one of my structures is very tight on vertical space (dist from an existing 18" RCP invert to the finished grade). I am limited on how much I can raise the finished grade because of the grade of a nearby road. Currently, my structure has 4" of clearance from the outside crown of the existing 18" RCP (2.5" thick walls) to the 8" precast structure lid, but I really need to find something smaller. The structure also has to accomodate an 18" RCP going into and out of the box. Anybody know any options for loosing a few inches?
 
Have you looked into using HERCP rather than the 18" Dia pipe? An equivalent HERCP is 14"x23" with a minimum wall thickness of 2 3/4". This would give you a few additional inches.
 
how about two 12" pipes?
 
Agree with CVG, use multiple smaller pipes.
 
The pipe flowing into the box is an existing 18" rcp, that being said the 18" rcp i have spec'ed for the outflow shouldn't be a problem. I guess I have to keep playing with the grading to get the box to work. Thanks for the tips though!
 
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