How to reinforce a bouncing floor??

I'll try to answer this best i can, not great at metric measures. To reinforce a bouncy floor you can do one of two things: 1.)sister the existing floor joists using construction adhesive and spikes or heavy screws. 2.) Install a Iron eye-beam perpendicular to the floor joists and support this with adjustable posts (meant for supporting an eye-beam) every 5-6 feet apart. This will definitely stop your floor from bouncing, and will allow you to retain the floors strength.