How to design a concrete collar between existing and new concrete pipe

[olsont]

I'm trying to find information on how to design a concrete collar. This collar will be used to connect an existing concrete box culvert with approximate dimensions of 5'x5' to a new concrete pipe which will have an inside diameter of 48" and outside diameter of 4"-10". My design now calls for a 10" thick concrete collar which is 48" inches long...24" on each side of both the pipes. The collar has #5 bars spaced 12" O.C. in both directions. Also, I'm calling for #4 dowels epoxy grouted in four locations in both the existing pipe and also the new pipe. Does this design sound reasonable?

 

[ztengguy]

are you transferring moment?

 

[olsont]

NO

 

[bridgebuster]

Maybe I'm missing something (besides my marbles) but if your culvert is 60" x 60" and your pipe has an OD of 58" why not brick it up? That's the usual method done for manholes and catch basins.

 

[BAretired]

What a strange question. You are asking if your design (for want of a better term) is reasonable. I tend to agree with olsont. The safe answer is NO!



BA

 

[ACtrafficengr]

Better check your hydraulics. The pipe has half the area of the box, plus you'll lose even more capacity due to turbulence at the transition. Extend the box culvert with more 5x5 box.

 

[ztengguy]

@ BA, I think he ment NO! to transfering moment.

Perhaps if the poster could attach a sketch?

 

[dicksewerrat]

Build a ten foot long manhole around the pipe and box. Shape the inside to steer/contaian the flow, which ever way it goes. If from bow to pipe, add a big overflow storage area.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[BAretired]

Is there anything useful in this link?

BA