External fixing frame arranged on 350 DEG C direct burial heat supply pipeline and used for preventing heat bridge from transferring heat

The utility model discloses an external fixing frame arranged on a 350 DEG C direct burial heat supply pipeline and used for preventing a heat bridge from transferring heat. The problem that a heat bridge effect easily happens in an existing external fixing frame of a direct burial type steam pipeline is solved. An external fixing ring (5) is placed on the sidewall of an external guard steel pipe (4); an outer ring of the external fixing ring (5) is fixedly placed in a reinforced concrete anchor block (11); an aluminum silicate lining (10) is arranged between the inner ring of the external fixing ring (5) and a heat transferring steel pipe (1); an internal fixing ring (6) is arranged on the outer sidewall of the heat transferring steel pipe (1); a ceramic layer of 2 mm in thickness is respectively arranged on the outer surface of the internal fixing ring (6) and an outer surface of an internal fixing ring reinforcing rib (7); and a high-strength heat insulation epoxy resin annulus gasket (9) and an aluminum f