Slanted recess in floor slab for floor-to-ceiling shower

Reinforcement only makes sense if it is properly embedded in the concrete. For openings in the ceiling, the structural engineer calculates to ensure that everything remains stable and, if necessary, strengthens other parts. If there are reinforcing bars here, I would strongly assume that this variant has not been agreed upon with the structural engineer.

Reinforcement only makes sense if it is properly embedded in the concrete. For recesses in the ceiling, the structural engineer calculates that everything remains stable and, if necessary, reinforces other parts. If there are reinforcing bars here, I would strongly assume that this variant was not coordinated with the structural engineer

It is embedded, just a few centimeters are not, and concrete will be applied again, in case there are corrosion concerns. And it is formwork, not chiseled out or cut. So there are quite a few indications that this was planned that way.

It is an intermediate ceiling between the ground floor and the upper floor.

All other construction sites have an HT pipe that only starts above the concrete; the recess in the concrete ceiling is always only present for the vertical pipe.