Prefabricated construction device, setting in place and usage thereof

A construction element comprising:

• a plurality of modules, each module having a rectangular parallelepiped shape, hollow and made of a composite material, delimited by an enclosure with four panels, two first opposing parallel panels and two second panels perpendicular to the first panels, the second panels comprise at least one groove parallel to the first panels and each second panel extends on one side by an L-shaped profile and on other side by a planar profile, the profiles being elements protruding outwards, parallel to said at least one groove and extending the second panels in a direction perpendicular to the first panels;
• wherein said each module is hermetically closed at least one of opposite ends of the respective enclosure by a cover, the cover comprising at least one groove perpendicular to the respective second panels and the opposite ends being called open faces;
• and
• wherein said plurality of modules joined together in a sealed manner by their respective second panels and superimposed or joined together in a sealed manner by their respective open faces, the open face of said each module being hermetically closed by its respective superimposed or adjoining cover, each superimposed or adjoining cover comprising at least one groove, and at least one seal housed in at least one of the grooves of the adjoining second panels and the superimposed or adjoining covers providing the sealed superposition or joining of said plurality of modules.