Reinforced Concrete Pipe walls 1

[engrwiz]

What does it mean when we describe RCP walls as Wall A, Wall B or Wall C? Under what condition will each one besuitable? Are there any manuals or documents that can help?

 

[gbam]

check out

http://www.concrete-pipe.org

for the concrete pipe design manual.

 

[engrwiz]

The manual, though very good, did not explain the meanings of Wall A, Wall B, or Wall C. I still need help.

 

[gbam]

I am not exactly sure. We have always designed based on wall "B". Maybe call your local manufacturer and ask them. Correct me if I am wrong but the load ratings are the same for the same class of pipe and typically that is what we are concerned with. Something kind of makes you say HMMM. Let us know what you find.

 

[engrwiz]

My project is a 60-inch dia RCP with 2-feet available height of cover.My local manufaturer referred me to ASTM C 76 where for 60-inch Dia RCP, Wall A thickness is 5", Wall B is 6" and Wall C is 6.75". My local manufacturer also suggested I go for Wall A since there will be no live Loading on the RCP. He concluded that with Wall A thickness of 5" any manufacturer can give me a suitable RCP strength (Class). How correct is he?

 

[dicksewerrat]

I'd use the "D" wall pipe. There will be live load on the pipe during the construction phase. Unless you don't backfill, compact or dress the surface. Ad who is to say in 5 years the land is sold and condos go up. "D" wall pipe withstnds the load required to make a crack in the pipe .001"

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[engrwiz]

My manufacturer actually said Traffic loading, not live loading in its entirety. Sorry, I misrepresented him on this.

 

[gbam]

engrwiz - have you considered specifying the pipe based on performance rather than wall size? For instance state the required d-load or class of pipe. This may alleive issues with wall thickness.

 

[engrwiz]

We allow Contractor and Resident Engineer(RE) sort it out in the field. As a matter of design policy,we specify pipe size and thickness, and the height of cover as well while Contractor has the option of selecting the pipe strength and Installation type to be approved by RE.

 

[gbam]

Interesting, we do it the by diameter and class unless there is a need for something more specific.