Ground-laid heat-insulated culvert pipe, the protective casing of which is friction-fixed to the surrounding ground

摘要

Friction-fixed ground-laid heat culvert pipe which comprises one or more medium pipe(s) 10 and a heat- insulating layer 12 made of rigid foam material which is arranged between the medium pipe(s) and an outer protective casing 11 and adheres to the medium pipe(s) and the protective casing. The heat culvert pipe is arranged with at least one movable end, and the foam material in the heat culvert pipe has a considerably greater density over a length of this end than along the rest of the culvert pipe.