A mold for the construction of a mattress-like protection and securing element, the mold comprising an upper frame (10), a lower frame (30) and a plurality of dice (60, 70, 80) coupled to the lower frame (30) and particularly suitable during use to receive the cement material, characterized in that the upper and lower frames are modular structures each comprising a plurality of support elements (12, 14, 15) that selectively connect with each other, the number and / or the length of the support elements are variable, in the place of use, in order to vary the length and / or width of the mold and the arrangement of the dice within the frames, the matrices comprising at least one die base (60), a lower die member (70) and an upper die member (80), the lower die members and the upper die members that are fixed to the lower frame and the upper frame of the mold, respective mind.
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