how to i fix my chest of draws when the bottom of the drawers has collapse?

Drawer bottoms are not usually fixed solidly to the drawer frame - they often sit in a slot to prevent them from falling out and just float.

Use white PVA glue to mend the frame and apply pressure while it's setting for the first few hours - you can apply the pressure with weights - proper wodworking cramps (which you will probably not have) or with rope... double run of rope around the frame with a short piece of wood to use like a tourniquet to apply tension to the rope - must protect the front edges with cardboard and check for square as you apply the pressure - do not forget to have the drawer bottom in place before gluing up... 12 hours should be plenty.

Super glue is not good on porous material like wood.

Good luck...

Peccavi
September 2009