Cavity under basement floor / how to fill

Good evening,

House built in 1980.

Basement with driveway and parking space. Basement below street level.

Camera inspection was done at the sewage pipe (stoneware pipe running diagonally under the house) and it was seen that it has settled. One pipe section was slightly sloping upwards in the flow direction.
Today, dug from the outside to the strip foundation and saw that there is a large cavity between the pipe and the basement floor (15 cm thick, no foundation).

At some point, the pipes outside were replaced and the connection to the pipe under the house was not done properly. (Pipes were just placed next to each other without sealing rings)
This leak further promoted the settling of the ground.

What do you suggest? Should the cavity be compacted and sealed?
If yes, how?

Have a nice evening

Good evening, House built in 1980. Basement with driveway and parking space. Basement below street level. Camera inspection was done at the sewer pipe (stoneware pipe diagonally under the house) and it was seen that it has settled. A pipe section was slightly tilted upward in the flow direction. Today dug from outside to the strip foundation and saw that there is a large cavity between the pipe and the basement floor (15cm thick, no foundation). The pipes outside were replaced once and the connection to the pipe under the house was not professionally done. (Pipes were only laid against each other without sealing ring) This leakiness further promoted the settling of the ground. What do you suggest? Should the cavity be compacted and sealed? If yes, how? Have a nice evening

Seriously: Please discuss the problem with a competent civil engineering company.

Seriously: Please discuss the problem with a professional civil engineering company.

Thank you for the advice, not just to reach the minimum number of letters.

This leakage further promoted the sinking of the ground.

Recently, there was a whole series of reports in the press (I think it was Der Spiegel) showing where large underground holes have formed and collapsed around the world. Underground water movements are not without consequences... I have no idea what needs to be done about it, but I consider it sensible to look exactly there and take action.

Sewer pipes must be tight, in my opinion everything has to be removed and replaced. These infiltration pipes are prohibited and you are lucky that the supplier has not yet held you responsible.

Wastewater pipes must be sealed,
in my opinion everything has to be removed and replaced.
These infiltration pipes are prohibited and you are lucky that the supplier has not yet held you responsible

Which infiltration pipes? I can't quite follow you. The ones shown are without infiltration holes.

If you mean the stoneware pipes, then many homeowners would now have to start removing their front gardens and floor slabs.

And if we didn't care, we wouldn't be addressing this.