Max reinforced concrete pipe slopes
Max reinforced concrete pipe slopes
(OP)
Dose anyone know of a publication or guideline that lists the maximum allowable slope to be used for various sizes of reinforced concrete pipe? Taking construct ability into consideration as well as durability of the pipe.





RE: Max reinforced concrete pipe slopes
RE: Max reinforced concrete pipe slopes
Is that true?
RE: Max reinforced concrete pipe slopes
Setting large pipes on steep slopes is difficult and possibly dangerous. It also may increase erosion of the pipe and earth at the outlet. On steep slopes it might also be necessary to cast anchors around the pipe to prevent separation as the backfill settles. The DOT may have test data to justify their maximum slopes. You might ask to see it in order to make your own informed judgement.
RE: Max reinforced concrete pipe slopes
Maury
RE: Max reinforced concrete pipe slopes
RE: Max reinforced concrete pipe slopes
The previously stated 10fps is a good conservative limit for sanitary sewer flow, due to expected continuous flow of high-solids liquid. Storm sewer flow is expected to be intermittent; although sand and grit are a concern, I usually try to limit velocity to 15fps (and have gone over 15, and had it approved) over shorter runs, 12 on longer runs in RCP. An ADS salesman once told me his engineers say HDPE pipe is good to periodic 25 fps, but I would never design to that. I should note that he was unable to provide literature backing the 25fps. ADS does provide literature showing negligible abrasion wear at 15fps with "fine sand", but measureable wear with "coarse sand"...but these tests are with very frequent cycling, which is not to be realistically expected within storm sewer pipes.
I know I didn't really answer the question, but it is a question I often have, so thanks for the motivation to summarize to myself!
RE: Max reinforced concrete pipe slopes