Motor vehicle floor panel contains reinforcement made from combined synthetic material and metal layers

The floor panel (102), made from a pre-shaped base containing at least one layer of a synthetic material, is reinforced with a layer of a combined synthetic material and metal, assembled and pre-shaped. The panel base can include a layer of a cellular material or a fibre-reinforced synthetic material, and can have two or more reinforcing members (106, 108, 110, 112, 114) in the form of seat cross-members, a tunnel, an inner stiffener for a tunnel or a bottom runner, which can be made by injecting a synthetic material into a mould containing a metal insert, part of which (120) projects from the finished panel. The panel can also be subjected to follow-up treatment in a cataphoresis bath or by stoving at a temperature of between 150 and 250 degrees C. Dans le procédé de fabrication d'un plancher (102) de véhicule, on rapporte, sur au moins une base (104) préalablement mise en forme et comprenant au moins une couche de matériau synthétique, au moins un élément de renfort (106,108,110,112,114) préalablement mis en forme et comprenant une couche de matériau synthétique et une couche métallique assemblées l'une à l'autre.