Planning to build a new toilet and shower and encountered a problem...
Subfloor with sawdust, cut beam exposing plumbing pipes, and scattered wood pieces, part of bathroom renovation project.
There's a toilet and shower above.
I would need to saw down the beam to fit a 110 pipe at least 5cm from the plank floor.
On the floor below, there is no wall directly underneath; it's about 2m inwards from the picture. In the basement, there is a wall directly below.

The floor joists seem suspended with flat iron on the beam, which is 10x23cm.

Wood beam with bracket and plumbing in a bathroom renovation project, showing wear and sawdust, possibly indicating a need for structural adjustment.

The wall to the left is a wall that goes from the basement to this floor, a little unsure if it continues to the attic floor.

Ideas on what to do?
Support on the floor below, cut, connect new drainage, and put a 10-20mm plate in the entire 55cm space, with a hole for the drainage? I can make the plate 5-20cm higher than the beam if that’s better?

Install a beam in the ceiling on the floor below as reinforcement? There might be a pillar, but I'm unsure about it...
Looks a bit odd in the bathroom downstairs in a corner.
The bathroom was redone maybe 25 years ago, and I have no one left to ask about it...
 
The floor I'm on, lunchroom corner facing the inside of the building and stairwell towards sewing machines Blueprint of a two-floor building labeled "Skinnvarufabrik," with details of a lunchroom, sewing machines, and a pillar-like square on the lower floor.

The floor below, storage, there's a square there that should be a pillar?

Floor plan of a building showing office spaces, staircase, storage area, and machine rooms. Includes labels in Swedish for specific rooms.

Gable
Here it looks like a wall all the way
Blueprint showing building floor plan with staircases and window placements, including a highlighted section possibly indicating a wall or pillar.
 
No one with any ideas?
Otherwise, it'll probably be glulam beam in the ceiling and a pillar in the floor below...
There was a pillar where the drawing showed.
 
Without fully understanding the issue (at worst this may be a non sequitur response) - is there a possibility to run the drainage visibly in the warehouse ceiling instead?
 
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nino
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B bearmaniac said:
Without fully understanding the issue (at worst this may be a nonsense answer) - is it possible to run the drainage visibly in the warehouse ceiling instead?
It's an apartment today so preferably not, but it would be possible.
 
I thought I had been clear but it's difficult to convey properly maybe
Wooden structure with marked red area to be cut, blue circle indicating desired direction for a 110 pipe installation; sawdust and tools visible.
So I would like to cut away the red and pull a 110 pipe this way, blue circle
 
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