900mm twin wall or concrete

[Jim130]

As above really, got a job that requires 900mm pipe for a dyke crossing, into a yard. Biggest vehicle going over a heating oil tanker.
Depth of cover over the pipe being made up of type1 and a 6” reinforced concrete slab total depth of job 2.5m. Twin wall offers far easier handling over concrete but are we compromising?? Thoughts appreciated.

 

[doobin]

I'd not be worried with twinwall with that cover.

 

[Smiffy]

As above really, got a job that requires 900mm pipe for a dyke crossing, into a yard. Biggest vehicle going over a heating oil tanker.
Depth of cover over the pipe being made up of type1 and a 6” reinforced concrete slab total depth of job 2.5m. Twin wall offers far easier handling over concrete but are we compromising?? Thoughts appreciated.

I believe the main advantage of concrete over twin wall is how straight you can get long runs without the slight bowing that twin wall can get. On a culvert this is not a consideration and 2.5m of cover will leave very little loading on the pipe.

 

[Storrsy]

I've used 900mm for farm crossings into fields where there has only been 12" compacted stone could be achieved on top. Been absolutely fine- the key is making sure the sides of the pipe are very well compacted.. should add that probably it's never had more than 5 ton on it but has been fine thus far