ᐅ Is it allowed to install sewer pipes in gravel?

Gravel serves as the drainage layer. A geotextile fabric is placed around it (not around the pipe) to prevent dirt particles from clogging the system. This way, the pipe itself is not damaged.

netzplan schrieb:

So far so clear. But can gravel not damage the drainage pipe, while a PVC pipe can?

Apparently not clear: Gravel as a bedding material under the pipe makes sense for drainage only when it is used to divert rising water—that is, water exerting hydrostatic pressure. Seeping water flows downward. And yes, a hard material can break a brittle one. Sand is used precisely because it is finer-grained than soil—gravel is coarser, so its angular edges exert more force.

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Additionally, a hole or crack in a drainage pipe is naturally less serious than in a sewage pipe. It goes without saying.

Well, some people even lay thick NYY-J (underground cable) for an industrial hall in basalt chippings 2/5. It will probably hold until the guy leaves the site. Still, he had to dig it up again and properly sand it.

xxsonicxx schrieb:

Gravel serves as the infiltration layer. Fabric is placed around it (not around the pipe) to prevent dirt particles from clogging it. This does not damage the pipe.

Our contractor wrapped the fabric directly around the drainage pipe. At other construction sites, I have seen that gravel (8/11) is laid first, then the drainage pipe plus a bit more gravel on top, and finally the fabric is placed over everything. (Companies handle this quite differently.) To wrap the fabric around the entire infiltration layer, you would need a roll wider than 1 meter (3 feet), otherwise you would have to wrap the infiltration layer meter by meter (with some overlap).

Both options are possible, depending on which load case you want to drain; sometimes one makes more sense, sometimes the other. There are also drainage pipes with a coconut fiber mat wrapping, which is intended to provide the filtering effect of a fleece and naturally makes installation easier.