Sewage Pipe under driveway

[Diydanp]

We had a new bathroom fitted a few years ago and the sewage went straight across the driveway, across where 3 cars park it’s probably less that 400mm at it’s most shallow and I think the pipe has sunk/ bowed under the weight. It is impossible to get any deeper as there was already an existing manhole this went into. Does anyone have any idea how we can reinforce the driveway where the cars park to stop this happening again after it gets repaired or is it just too shallow?

 

[jeds]

Normal spec is to excavate either side of the sewer line and concrete over with mesh. The pipe should be covered with 100mm pea gravel. Depth of the excavation depends on the ground conditions? It needs to be non-shrinkable.

 

[Diydanp]

Ahh, okay! That definitely wasn’t done so that’s good to know that there is a solution. Should the pipe be bedded on sand too?

 

[jeds]

No, bed the pipe on 100mm pea gravel.