System of couplable prefabricated panels for building

A system of couplable prefabricated panels, comprising a first prefabricated panel and a second prefabricated panel and at least one coupling device configured to couple said first prefabricated panel with said second prefabricated panel, the first and second prefabricated panels having a first groove and a second groove, respectively,

• wherein said at least one coupling device comprises:
• a foil key extending over a first reference plane defined by a transversal axis and a longitudinal axis;
• a metallic coupling element extending from said first reference plane, the metallic coupling element comprising:
• a first tapered element extending to a first predefined height on a first side of said first reference plane;
• and
• a second tapered element extending to a second predefined height on a second side of said first reference plane, opposite to said first side,
• said first and second tapered elements comprising a first and a second mutually facing bases, respectively, each extending along a first length and a second length on the first reference plane;
• wherein said first and second tapered elements each comprises a first wing and a second wing symmetrical with respect to a second reference plane defined by the longitudinal axis and a vertical axis perpendicular to said first reference plane, the first wing and the second wing each comprising a plurality of fast-connected portions, defined on a third reference plane, which is defined by the transversal axis and the vertical axis, as follows:
• a first linear portion extending from said first and second bases, respectively, with an angle 10<β<45° with respect to said vertical axis;
• a second elbow portion extending from said first linear portion;
• wherein the foil key is configured to rotate said metallic coupling element from a rest position in which each tapered element is inserted in the respective groove with said first length substantially oriented along said respective groove so that each tapered element is free to move along the respective groove, to a locked position in which each tapered element is inserted in the respective groove with said second length substantially oriented along said respective groove so that each tapered element is constrained to the respective groove along said first reference plane, and vice versa;
• wherein:
• the first groove and the second groove, respectively, have dovetail-shaped cross sections, each groove being formed by a first oblique side and a second oblique side each having a first end and a second end, and a third side joining the first end of said first oblique side to the first end of said second oblique side;
• the first and second oblique sides have a first projection and a second projection, respectively, each projection respectively arranged at the second end of a respective oblique side and protruding to respectively form a first step and a second step with the respective oblique side between a first protruding wall adjacent to said respective oblique side and a second protruding wall adjacent to said first protruding wall, said first and second projections facing each other;
• the first and second tapered elements are symmetrical with respect to the first reference plane;
• the first and second tapered elements are fast connected to said foil key;
• the first wing and the second wing each comprises a third linear portion extending from said second elbow portion up to a first free end with an angle γ≅90°−β with a tolerance of ±2° with respect to said vertical axis;
• and
• wherein said first free end is rounded-shaped on both sides transversely to a main direction of extension of the respective first free end so that, when the first and second prefabricated panels are in the locked position, each first protruding wall abuts against said first free end.

A method for coupling a first prefabricated panel and a second prefabricated panel, the first prefabricated panel having a first groove and the second prefabricated panel having a second groove along respective groove directions, the first groove and the second groove, respectively, having dovetail-shaped cross sections, each groove being formed by a first oblique side and a second oblique side each having a first end and a second end, and a third side joining the first end of said first oblique side to the first end of said second oblique side, the first and second oblique sides having a first projection and a second projection, respectively, each projection respectively arranged at the second end of a respective oblique side and protruding to respectively form a first step and a second step with the respective oblique side between a first protruding wall adjacent to said respective oblique side and a second protruding wall adjacent to said first protruding wall, said first and second projections facing each other, the coupling being effected by means of a coupling device comprising:

• a foil key extending over a first reference plane defined by a transversal axis and a longitudinal axis;
• a metallic coupling element extending from said first reference plane, the metallic coupling element comprising:
• a first tapered element extending to a first predefined height on a first side of said first reference plane;
• a second tapered element extending to a second predefined height on a second side of said first reference plane opposite to said first side,
• said first and second tapered elements comprising a first and a second mutually facing bases, respectively, each extending along a first length and a second length on the first reference plane;
• wherein said first and second tapered elements each comprises a first wing and a second wing symmetrical with respect to a second reference plane defined by the longitudinal axis and a vertical axis perpendicular to said first reference plane, the first wing and the second wing each comprising a plurality of fast-connected portions, defined on a third reference plane, which is defined by the transversal axis and the vertical axis as follows:
• a first linear portion extending from said first and second bases, respectively, with an angle 10<β<45° with respect to said vertical axis;
• a second elbow portion extending from said first linear portion;
• wherein the foil key is configured to rotate said metallic coupling element from a rest position in which each tapered element is configured to be inserted in the respective groove with said first length substantially oriented along said respective groove so that each tapered element is free to move along the respective groove, to a locked position in which each tapered element is inserted in the respective groove with said second length substantially oriented along said respective groove so that each tapered element is constrained to the respective groove along said first reference plane, and vice versa;
• wherein
• the first and second tapered elements are symmetrical with respect to the first reference plane;
• the first and second tapered elements are fast connected to said foil key;
• the first wing and the second wing each comprise a third linear portion extending from said second elbow portion up to a first free end with an angle γ≅90°−β with a tolerance of ±2° with respect to said vertical axis;
• and
• wherein said first free end is rounded-shaped on both sides transversely to a main direction of extension of the respective first free end so that, when the first and second prefabricated panels are in the locked position, each first protruding wall abuts against said first free end,
• the method comprising:
• bringing the first prefabricated panel and the second prefabricated panel close together, so that the respective groove directions are parallel and the first and second grooves face each other,
• inserting the metallic coupling element inside the grooves, so that the longitudinal axis is perpendicular to said respective groove directions;
• and
• rotating the coupling device about the vertical axis so that the longitudinal axis is at an angle of 0-30° relative to said respective groove directions and at least two-thirds of the foil key lies between the first and second prefabricated panels.