There is a concrete wall on both sides of the opening, so it's possible. Which mounting screw are you referring to? I don't know about that. But you drill into the concrete, insert a plug, drill a smaller hole through the pillar for the thread to catch, and screw in some sort of fastening?
 
J
First, drill a 14mm hole about 20mm deep into the post at the locations where you plan to attach the post to the wall.
Then, take a 5-6mm drill bit and drill through the post, centered in the 14mm hole. Once you've done this, position the post where it should be and drill through with a 6mm concrete drill bit into the wall. After marking the drill holes, remove the post and drill the holes, inserting plugs.
Then, place the post back and screw in the screw, and then you can fill or plug the 14mm large hole.
 
  • Image of a T6SF Jumbo Jetting Screw by Västsvenk Byggskruv AB, with a 6-sided head and flange, for outdoor wood construction, 8mm diameter, 140mm length.
Even I understand :-) Thank you Jansson
I will take it further.
 
Now everything is purchased and the pillars are to be attached to the concrete floor with rebar according to the sizing and about 20cm into the pillars. The problem is that these bars are rusty. Is it okay? Or are there stainless bars (not threaded)?
 
If you want, you can remove the rust and apply some primer on the iron.
 
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Stainless steel plate attached to a log, with drilled holes for fastening to stone or floor using an expansion bolt, part of DIY deck post installation.
This is how I did with my posts for the terrace.
A stainless steel plate with a hole at the bottom of the log/glulam beam/post and then an expansion bolt in the stone/floor it stands on.
/Workingclasshero
 
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H heimlaga said:
If you want, you can remove the rust and apply some primer to the iron.
Hm that might be a solution. But the paint might come off when trying to insert it into the column. Maybe some spray that protects? Does that exist?
 
K kladde said:
Hm it could be a solution. But the paint might come off when trying to insert it into the column. Maybe there's a spray that protects? Does it exist?
What comes off, comes off.
 
K kladde said:
Now everything is purchased and the columns will be fastened to the concrete floor with rebar according to specifications and approximately 20cm into the columns.
The problem is that these bars are rusty.
Is it okay? Or are there stainless steel bars (not threaded)?
It's OK, it's just surface rust. It takes so long for them to rust sufficiently to become a problem that it's only a matter for archaeologists.

Let me put it this way: You reinforce concrete with it. Concrete is never completely dry...
 
Since you're treating the end grain anyway, fill the hole with the same oil.
 
J
This is indoors in a heated dry area so no rust protection is needed..
 
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Many years ago, I saw a link here on Byggahus that solved this exact problem. I don't remember exactly how it worked, but it was a mount in the floor that was flush with the floor, and nothing protruded from the post. This way, you could place a full-length post without a gap between the floor/ceiling and the post. Once the post was in place, you would put a tool in the screwdriver and hold the tool against the post while running the screwdriver. Using magnetism, a screw would then be driven into the ceiling/floor mount, if I recall correctly. Perhaps this solution is still around, and someone else here has a link to the product?
 
Thank you all. Now I have something to think about. But I'm more sure now.
 
It might have worked with a regular angle bracket.
Screw the angle bracket to the floor, place the post on the angle bracket and then screw the protruding part of the angle bracket to the side of the post.
Then cover the protruding part of the angle bracket with the baseboard.
 
The problem has already been solved. Screw them to the walls at the bottom.
 
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