Drainage connection advice please

[Hobo84]

Hello all,
Started a self-build extension and not sure how to proceed with the new bathroom drainage layout.
I've added my drawings with the drainage plan however I wish to add a shower in the WC and not sure how to the waste layout will work. I plan to add a shower to the right side, then a toilet and then a basin (pic attached as a rough idea ). I've already laid the 110mm pipe and relocated the inspection chamber the WC room. The 110mm pipe ended up about 200mm from the right side of the room and is pointing upwards vertically from a 90' bend coupling. The floor is block and beam however only loosely laid so I can pick them up if needed for access. The bit I'm struggling with is:
I don't want to have any boxing as the space is already pretty tight, so can I run vertical pipes through the block and beam floor and connect all the waste pipes (sink, toilet, shower and kitchen waste) underneath? Is that practical?
If so, what’s the best way? It was a combination of traps/bend and pipes how is best to secure them.
Also will it need some sort of venting?
Hope this makes sense.
Neil

 

[noseall]

Anyone got a magnifying glass?

 

[theprinceofdarkness]

Why not copy (roughly) the layout in the picture. two things I have noticed, no flush unit for WC and no shower screen. The pan looks like one I have, its rear entry P trap, so in the pic, the waste is going straight out under the shower tray, have you enough headroom for such a high tray? I wonder if a corner fitting WC might work out better, makes a shorter "wall", which needs to be protected from the shower. Where is your stack pipe?
Frank

 

[Hobo84]

Noseall - I’ve reattached the floor plan. Hopefully that’s better.

Theprinceofdarkness – The picture of the bathroom is just a rough idea. I’ll probably make it more of a wet room so the tray height couldn’t be an issue.

The question about the stack pipe is part of my query. As the toilet would no longer be against the wall will I have an issue venting it or are there products to get around it?

Also could I connect all the waste pipes under the floor into the main outlet pipe I've laid and if yes, should I? I’d imagine if there are any issues getting to them will be a pain in the bum.

 

[theprinceofdarkness]

If you turn it into a wet room, every thing within 5' of the shower will get wet. So that's a cover for the toilet paper for a start. Cupboard for the towels? and more importantly the box under the shower tray will hide you toilet waste or you will have to beat several holes in your beam and block floor.
Venting the waste pipe, I am surprised that the BCO has not picked it up. I would have thought that there should be a stack pipe (higher then the eaves) just outside the shower room wall, else a vacuum release valve on a stub stack that is higher then your wash basin waste. This so any blockage would result in the waste appearing inside the building, causing you to notice it. If it was lower then it could be under the floorboards leading to sewerage running down the road.
Connecting small wastes into big one should be no problem though for added security use two 45 degree bend with a couple of inches of pipe between them instead of a 90 degree bend. This way you can rod around the bend from the U bend/trap in the room.
Frank