Mould for the construction of a protection and securing element of the mattress type and relevant method

A mould for constructing a protection and securing element of the mattress type, the mould comprising an upper frame, a lower frame and a plurality of dies engaged in the lower frame and particularly suitable during use for receiving cement material, wherein the upper and lower frames are modular structures which each comprise a plurality of carrier elements which are selectively connected to each other, the number and/or length of the carrier elements being variable, during use, so as to vary the length and/or the width of the mould and the arrangement of the dies inside the frames, the dies comprising at least one die base, a lower die member and an upper die member, the lower die members and upper die members being fixed to the lower frame and the upper frame of the mould respectively.