Abstract: Method for manufacturing, and heat-insulated pipes comprising coaxial tubes sliding relative to each other with controlled friction: (a) applying a film (3) of non-adhesive and lubricating material onto the inner surface of a first outer casing tube (2) and/or onto the outer surface of a second inner carrier tube (1); b) fixing a series of spacers (4) made of heat-insulating material onto the inner carrier tube (1); c) coupling and centring the outer casing tube (2) on the inner carrier tube (1); d) mounting suitable sealing flanges (6) on the ends of said tubes (1, 2) coupled together; f) supplying, via the flange or flanges (6) and by suitable means (7), liquid resin which, as a result of subsequent expansion, fills completely the cavity (5) formed between said tubes (1, 2); g) removing the flanges.