A metallic frame structure of a modular and mobile housing unit, adapted for use as a residential container, an office container or a room module, comprising:
- a plurality of horizontal main floor profiles connected detachably to one another to form a floor frame;
- a plurality of horizontal main roof profiles connected detachably to one another to form a roof frame;
- a plurality of vertical support profiles, each connected detachably to the horizontal main floor profiles by a floor corner connection and to the main roof profiles by a roof corner connection so that the floor frame and the roof frame are connected together in parallel and at a vertical distance from one another,
- wherein the support profiles are arranged so that when stacking two or more frame structures on top of each other, the frame structure stacked on top is supported mainly by the vertical support profiles,
- wherein at least one of the main floor profiles, main roof profiles or support profiles is a hollow metal profile which has a longitudinal structure extending along a longitudinal direction of the hollow metal profile and originating from an outer profile surface, which longitudinal structure is configured as a longitudinal elevation having a width of less than 20, 15 or 10 millimeters at its origin at the outer profile surface in a direction transverse to the longitudinal direction of the profile,
- wherein the hollow metal profile with the longitudinal structure is formed from folded steel sheet metal which is bent in one piece, two pieces or many pieces, wherein the longitudinal structure originating from the outer profile surface is formed by means of bending, whereby either the sheet metal is welded along the longitudinal direction of the profile or another method of connection is used to close the bent metal sheet along the longitudinal direction of the profile, so that a hollow metal profile is formed, and
- wherein the longitudinal structure configured as a longitudinal elevation is a fold in which two bent sheet metal plate sections lie one on the other so as to form the fold having the width at double the thickness of the sheet metal and so as to form the fold as a protrusion that protrudes perpendicularly from the longitudinal direction of the profile and either terminates to form a perpendicular protrusion or is bent again to form a bent protrusion, and wherein the longitudinal structure of the hollow profile forms a guide edge for positioning a section of one of the main floor profiles, main roof profiles or support profiles.