Minimum Concrete Cover above 24" CMP

[CWEngineer]

Do you guys know what is the minimum concrete cover above a 24 in CMP (Corrugated Metal Pipe) to be placed underneath an access road? Is there a standard detail that might have this information?

THANKS

 

[AUCE98]

AASHTO Section 12 " Corrugated Metal structure interaction systems" will have what you are looking for.

AUCE98

 

[cap4000]

For concrete cover I am not aware of a minimum. Sometimes the pipe manufacturer may have that info. Typically its compacted soil or gravel cover requirements.