Box girder, in particular crane girder, and crane herewith as well as manufacturing method therefor

A crane having a crane girder and a crane trolley supporting a lifting gear that is arranged on the crane girder, wherein the crane comprises:

• two side plates spaced apart from each other;
• two chord plates comprising an upper chord and a lower chord connecting the two side plates to each other, wherein the upper chord and lower chord define horizontally extending planes;
• at least one transverse plate that is arranged between the side plates and that connects the side plates to each other;
• and
• a welded joint connecting the respective chord plate and the side plates;
• wherein at least one form-fitting connection comprising a plug-in connection is disposed at the transverse plate and each of the two side plates, and wherein at least one form-fitting connection comprising a plug-in connection is disposed at the transverse plate and at least one of the two chord plates, and wherein a lifting gear is movable along the crane girder on its upper chord or lower chord by a crane trolley.

A method of producing a crane girder, said method comprising:

• spacing two side plates apart from each other;
• arranging at least one transverse plate between the side plates;
• and
• connecting the two side plates to each other with the at least one transverse plate and with at least one chord plate, wherein the at least one chord plate defines a plane that extends horizontally when connected thereto and wherein said connecting the two side plates to each other includes at least one form-fitting connection comprising a plug-in connection disposed at the transverse plate and each of the two side plates, and includes at least one form-fitting connection comprising a plug-in connection disposed at the transverse plate and the chord plate;
• welding a joint between the respective chord plate and the side plates after said connecting the two side plates to each other;
• and
• supporting a crane trolley for movement on one of the at least one chord plates.