A stirrup is a circular or square-bent reinforcement piece that encloses the longitudinal, or in your case, vertical bars. In a footing, they are designed to "hold together" the concrete and the main reinforcement.
You can use, for instance, 6 mm bars. Sometimes, very thick steel wire, 3-4 mm, can even suffice.

Then, the stirrups should be tied to the main reinforcement so they remain in place during the casting.
Also, tie the bracket that you will use to attach the wooden beams.
 
HELLO HELLO

I have now almost finished taking down the entire house, so the casting is approaching. When I measured the diagonal on the pillars, they were 23 cm. I've only found casting tubes with 20 or 15 cm diameter. Are there 25? Anyone know where to get those if so.
 
You can always craft your own molds!
If you make them openable, you can usually move them so you don't have to make so many.
 
Hello Anaitis!

I hope you are still monitoring this thread.
I plan to construct the plinth according to the following drawing. What do you think about it? I know you think I should build forms, but I am more short on time than money, and building 12 forms takes too long.
I intend to drill into the corners of the existing plinths and attach reinforcement bars with expansion mortar.
What I am a little unsure about is the placement of the bars. Will this be a durable construction as I have drawn it? What dimension should I use for the bars?
 
  • Plinth construction diagram showing reinforcement bar placement and existing plinth with marked dimensions, labeled in Swedish.
I would have placed the irons 45 degrees from your suggestion, i.e., in the middle of the existing footing sides.
On the outside. That way you won't have to drill!
Tie them down with wire around the old footings so they don't move during pouring.
Then don't forget the brackets.

The reinforcement can be 10 or 12 mm, the brackets thinner.
 
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  • Diagram showing suggested placement of reinforcement bars and a new 25cm pipe over an old point. Labels indicate different components for construction.
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