Culvert pipe

[Hazzard]

I'm putting an 18" concrete pipe in a ditch to make a culvert for access into a field. Base of ditch is clay, width of ditch top to top is 8 feet and the top of the pipe is only 1.5 feet from the required finished level of roadway through to the field.
Sides of the pipe have been filled with broken brick/concrete.
Question is what do I finish the topping with to achieve a load bearing surface enough to take up to 6/7 tonnes weight

 

[Steevo]

Crush concrete or type 1 would be absolutely fine and support almost any weight you want.

 

[RobFZS]

i'm gonna do similar in a couple of months, was thinking of putting some crushed brick etc on it, where did you get the concrete pipe from ?

 

[Hazzard]

i'm gonna do similar in a couple of months, was thinking of putting some crushed brick etc on it, where did you get the concrete pipe from ?

I've been advised today that crushed limestone wackered down in layers will be enough, but don't know, does'nt seem enough somehow. Don't want to go to the expense of concrete...maybe lift the existing roadway level to 2 feet+ for more cover. Got the pipe from a firm called RS Beaver ltd from near Church Stretton in Shropshire, 01694 751265.

 

[Hilly]

Plastic twin wall would take 6-7 ton with 1.5 foot of hardcore on top never mind concrete pipe.

 

[Hazzard]

Plastic twin wall would take 6-7 ton with 1.5 foot of hardcore on top never mind concrete pipe.

Thanks Hilly, guess that answers it then, hardcore it shall be.

 

[Hilly]

Thanks Hilly, guess that answers it then, hardcore it shall be.

I have some 18" concrete pipes with 6" of hardcore over them and 10ton goes over regular for the last twenty years no problems

 

[tomlad]

Guy near Garstang Lancashire has a yard full of pipes
slight seconds but fine
Collinson
I think he does haulage
don't know number sorry

 

[Andy26]

https://www.cotterillcivils.co.uk/land-drainage/twin-wall-culverts/

 

[renewablejohn]

Are you sure that pipe is big enough for the ditch. I would be very wary that your pipe would silt up and create a dam. I normally put in a bundle of 3 pipes strapped together so as the ditch fills up you have clear pipes to take the excess.

 

[Hazzard]

Are you sure that pipe is big enough for the ditch. I would be very wary that your pipe would silt up and create a dam. I normally put in a bundle of 3 pipes strapped together so as the ditch fills up you have clear pipes to take the excess.

Thanks for that....the ditch has 2 existing pipes already without any trouble, the flow is very very slow almost flat fall. I think it will be ok. By the time it wants clearing I shall probably be gone from here !!