soil pipe: surface to ground connection?

[junglejim01]

I'm in the process of installing an Inspection chamber...going well so far but i'm wondering about the soil pipe connection...the pipe runs approx 1.5m from the chamber, then i've got a bend to take it to the surface (brown plastic pipe). This is an adjustable bend with female connectors at each end. I'm planning on positioning it so that the top opening is at surface level, so that i can concrete flush to it and install soil pipe. Is this ok? or should i lower it fully underground, fit soil pipe then cement? or any other ideas? My thinking is that if the connection is flush to the surface then i can can access/replace soil pipe easily should i need to.

Thanks

 

[junglejim01]

Also... my mains water pipe runs directly beneath the downstream pipe. Building control will be coming in to pass of the work, does anyone know if this is going to cause problems?

 

[Hugh Jaleak]

I'd concentrate on getting the correct fall on the drain, rather than the positioning of the bend. A long radius bend at the base is usually required at the base of a stack though. If this then is still below ground level then fit a piece of pipe to take you to required level with a coupling on the end to accept the spigot of soil pipe. (Unsure if an adjustable bend would suffice, i'd check with B.C.O.)

Usual practice to leave a slight protrusion of underground above ground level, a cap can be fitted into the socket to prevent ingress of detritus whilst works are carried out, then removed when you're ready to fit the soil pipe.

If the water pipe crosses the drain then shouldnt be an issue, but i'd be wary about laying a drain directly over it, in the rare event you might need to get at it, it'll make access rather awkward.....