Thermally insulated and heated double-walled pipe segment for fitting by screw fastening, and a method of implementing such a pipe segment

A fluid transport pipe for transporting a fluid, which pipe is made up of adjacent segments designed to be fitted by screw-fastening for implementing a fluid transport pipe for transporting a fluid, which said pipe comprises an inner wall and an outer wall, said segment comprising an inner tube and an outer tube that define an annular space between them, both ends of said inner tube having a thread for assembly to adjacent segments, wherein said segment comprises at least one heating duct placed in said annular space and opening out at either end of said annular space, said annular space being designed to be closed hermetically in order to enable it to be brought to a reduced pressure, and

• wherein at least one electrical heating line operating by Joule heating is placed in said heating duct and is designed to be connected to at least one electrical heating line of an adjacent segment when screw-fastened together.