Abstract: A drilling derrick device for handling drill-pipe stands has at least one movable racking platform with pipe-stand receiving compartments, supported above the working deck of the derrick, at least one racking carriage associated with the racking platform and movable on the working deck and a pivotable drill-pipe robot having gripping arms to load and unload the racking platform and the racking carriage. The racking platform and the racking carriage are moved in synchronism relative to the drill-pipe robot which has a fixed position on the working deck in order to perform drill string dismantling and assembly operations.