Cover shaft 1.5 x 1.5 concrete like structure

Formwork for the ceiling with a round recess of about 62 cm to be removed. Supports and reinforcing steel to be installed according to static requirements. Concreting.

I don't know what the static requirements are because I would actually prefer not to hire a structural engineer for such a small matter who then charges x euros.

I thought the information on what matters could come from your experience.

I don't know what the static requirements are because I would actually be reluctant to hire a structural engineer for such a small matter who then charges x euros.

I thought the information on what matters could come from your experience

Therefore my suggestion is to use an FT, they have a standard static design.

From experience, I am also asking how you want to seal it? In the end, the water comes out in the basement.

This is done with pci swimming pool sealing. The respective field service has already been here and put together the products for me. A basement is 3 meters further. Above is a swimming pool and to the right is a terrace. I don’t have major concerns about the tightness. I could also just lay the FT on top, but that won’t work because the wall on the right is about 60cm higher, meaning it has to go inside and not on top.

Is this a DIY project? Otherwise, your contractor should take care of it responsibly.

Without experience, you don’t do a DIY project. And certainly not with help from a forum.

Sure, I can tell you every 15 cm an 8 mm concrete steel as crack reinforcement, crosswise, each 5 cm from top and bottom distance. Reinforcement in 4 support pockets measuring 20 cm * 20 cm and 10 cm deep.

Your variant with the steel beams probably works too.

Warning irony: Should I draw a plan too?

Thank you for your response. Yes, it is a DIY project. I have completely renovated a house in DIY just like the pool is under construction. Until now, I haven't had a craftsman and was always able to do everything myself. You just need to know which material to use best and, if necessary, how the structure should be, then you don't need a company for something like that. Your theoretical explanation is good. If indeed so "little" steel is enough, that's good. I thought beams had to be installed because there is still a load pressing from above, but even better then, thank you very much. I would also gladly appreciate a plan additionally.

I would also be happy to have a plan in addition

Who wants something must deliver. Your information is very insufficient.