Method and device for manufacturing a thermally insulated pipe

A device for the continuous production of a line pipe which has at least one inner pipe, a foamed thermal insulation surrounding the inner pipe and a corrugated outer jacket, which device comprises, in substantially linear sequence, a first device for unwinding the inner pipe from a supply reel, a second device for forming a foil tube around the at least one inner pipe and for introducing a foam-forming starting material into the foil tube, and an extruder, a corrugator and a device for winding the line pipe emerging from the corrugator, wherein a protective pipe is provided leading through the extruder and lying in longitudinal direction of the device, which extends into the corrugator, in which protective pipe the inner pipe surrounded by the foil tube can be guided through the extruder in such a way that the extrudate produced by the extruder is corrugated in the corrugator separately from the inner pipe guided in the protective pipe.