EPS, concrete or sand floor drain basement?

[ÉlPon]

Hello,
In my basement with a concrete floor, I have a small corner/room of 1m2 that I want to pour again; see the picture to see what it looks like. At the bottom across the space, there's a cut-out drainage pipe where two water hoses lead to the well and a heating cable inside. I might try to reinforce this a little so the pipes don't crumple together, then I want to pour some concrete around the pipe so that it holds its shape even if the pipe crumples and doesn't collapse under a bit of pressure (so sand doesn't fall into the pipe).

What should I then fill the hole with up to floor level? Can I fill up with EPS cement and then use self-leveling compound for the last layer? However, I won’t be having any tiles or anything else afterwards. Is it then better to use concrete as the surface layer?

This might eventually be changed in a few years when it becomes municipal sewage, so I don't want to have a hell of a time tearing it up later if necessary.

Or should one instead fill up with sand and just cast concrete the last 10cm? It seems to be like that on the existing. But I realized as I write that it might not be good for the floor drain or maybe it's fine anyway? Just a small extra lump around there?

 

[corre]

Fill with macadam or crushed stone, 16-32 or equivalent, lay down some geotextile and pour the last 7-10cm with quick-setting concrete. Pack around the pipes with sand or fine gravel. If it's not as deep as the image suggests, then use gravel all the way. It won't be worse than the rest of the floor.

 

[mexitegel]

If you're worried about getting sand in the pipe, wrap it with landscape fabric, and you'll be safe. It's easier and faster than casting concrete around it.