An anti-lifting coupling system (10) for the reversible joining of elements for providing a formwork for floor castings, comprising:- a first engagement body (11), to be fixed to a first beam of a formwork structure,- a second engagement body (12), to be fixed to a second beam of a formwork structure,the first engagement body (11) and the second engagement body (12) comprising reversible means of mutual engagement which are contoured to prevent the movement upwardly, in the configuration for use, of the second engagement body (12) with respect to the first engagement body (11).
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