Windproof and anti-fragmentation device for a raised floor

A windproof and anti-fragmentation device of a raised flooring comprising:

• a plurality of support plates for one or more cover tiles, said support plates being arranged side by side, said support plates each comprising a groove defined on a perimeter portion of said plates;
• and
• an anchoring washer couplable to one or more of said support plates and having an edge emerging transversely with respect to a perimeter of said anchoring washer, said edge being configured to fit at least partially inside said groove of at least two of said support plates disposed contiguously so as to keep said at least two support plates joined together,
• wherein said anchoring washer comprises a shaped opening configured to allow an insertion of a tool used to rotate said anchoring washer, said shaped opening having an hourglass-shaped perimeter defined by adjoined opposing trapezoids with rounded bottoms and with lateral walls that provide abutment surfaces for said tool, said abutment surfaces being spaced apart from each other by a predetermined angle so as to allow said tool to force a rotation of said anchoring washer over a rotation angle corresponding to said predetermined angle and further allow a counter-rotation of said tool corresponding to said predetermined angle while avoiding a counter-rotation of said anchoring washer, whereby said tool can be extracted from said opening.