Overhead travelling crane device (10) for the erection of installations and large-scale maintenance in industrial buildings, comprising a beam (11) at the ends of which there are mobile trolleys (16) suitable for sliding between the first paths (12), present inside a shed for industrial use, in which the said beam (11) comprises multiple separable and/or telescopic stubs, in which at least one of the stubs at the end of the said beam is fitted with a component (16 and 17) for adjusting the end of the length of the said beam (11), and in which the said beam is provided with second paths (18) suitable for allowing the traverse of at least an overhead platform (19 and 20) for accommodating operator staff.