Formwork & Falsework for Transfer Plate

There is not enough information to give much of an answer. I assume you have an RC building and want to construct additional floor(s) with a different column spacing. My first look is to see if I can add a new beam above the existing one, this is simplest to design and to build.

The difficulty in adding a beam below, is getting good contact so the load can transfer through the existing beam to the new beam. I did do one similar to this but I added a steel beam well below the RC beam and used just two diagonals up to the existing beam, just below the new column. the top of the diagonals was larger than needed so we could use a flowable grout to get a good bearing surface.

Good luck, it is not a simple problem.

My plan is like this:

I want to utilize the existing RC beams at lower floors to form a part of truss. Anyone has tried this setup before?

The lower floor is unlikely to have enough reinforcing to take the tension. Better to use a steel shape. Another negative consideration may be the ratio of the moduli of elasticity, depending on the size of steel members.

Anybody knows if water cooling system is required for transfer plate construction?

RC (Concrete ?) beams are not built for stretching,they will crack soon

Does anyone find some pedestrian footbridges have similar structure as my sketch?