INSULATION UNIT AND CORRESPONDING METHOD

Described is a fixing device for fixing together a first (3) and a second (4) structure, each of said structures (3, 4) having at least a first (30, 40) and a second (32, 42) cavity, the device comprising a first (1) and a second (1) fixing element, each fixing element (1) having a body (10) comprising a seat (12) and a pin (14), wherein: - the pin (14) of the first fixing element (1) is configured to be inserted, freely passing through, in the first cavities (30, 40) of the first (3) and of the second (4) structure and to be reversibly coupled to the seat (12) of the second fixing element (1), and - the pin (14) of the second fixing element (1) is configured to be inserted, freely passing through, in the second cavities (32, 42) of the first (3) and of the second (4) structure and to be reversibly coupled to the seat (12) of the first fixing element (1).