Currently replacing some drain pipes in 2 rooms in the basement, have dug up the concrete and uncovered the old pipes.
Right now the old cast iron pipes are in a mixture of sand and stone as you can see in the pictures. It's at least 1 meter deep in the ground.
What would you do with the substrate when installing plastic pipes in the same place to ensure the pipes don't sink under the concrete when it's poured?
Why do you fear that the new ones might sink? The old cast iron pipes are still there, probably at the correct level. If that's the case, I suggest the following.
Tear up old pipes and clear out for a new bedding with room for new sand. Place a geotextile-type fabric on the trench bottom and on top of that, a layer of about 7 cm of sand and pack well. On this, lay new plastic pipes which should be surrounded with more sand up to the future concrete slab's bottom. Pack well.
The fabric is meant to prevent the sand from sinking between coarser materials due to vibrations when walking on the floor or if groundwater temporarily rises, so that settlement doesn't occur. This is said based on your pictures and ground with normal bearing capacity where the house is not on piles on loose soil. I recommend that the pipes are laid with a 2% slope where possible.
Why do you fear that the new pipes will sink? The old cast iron pipes are still there, probably at the correct level. If this is the case, I suggest the following.
Tear up the old pipes and clean out for a new bedding with room for new sand. Lay a fabric type geotextile at the bottom of the trench and on it a layer of about 7 cm of sand and pack it well. On this, place the new plastic pipes which are surrounded with more sand up to the future concrete slab's bottom.
The fabric is intended to prevent the sand from sinking down between coarser material due to vibrations when walking on the floor, so that settlement can occur. This is said based on your pictures and ground with normal bearing capacity where the house is not standing on piles on loose ground. I recommend that the pipes be laid with a 2% gradient where possible.
Thanks for the detailed explanation, then that's what I'll do.
I guess I'm just extra anxious since you don't want anything to happen once you've poured the concrete and laid the tiles
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