Method for constructing a pipeline portion of a pipe system, and pipeline portion of a pipe system in a heating network

A pipeline portion (5, 6, 7) of a pipe system in a heating network (4) which is provided for transferring a heat transfer fluid between a heat supplier (3) and at least one heat consumer (4),

• wherein a pipeline extending over the pipeline portion (5, 6, 7) for transferring the heat transfer fluid is arranged in the pipeline portion (5, 6, 7) together with a bedding material surrounding the pipeline in a lower region of a trench (15), which is backfilled with a backfill material in an upper region (18),
• wherein the pipeline portion (5, 6, 7) is divided into several segments (A, B, C, D, E) along the pipeline portion (5, 6, 7),
• wherein a soil thermal conductivity, determined for each segment (A, B, C, D, E) based on a soil water balance, of two adjacent segments (A, B, C, D, E) differs by more than a specified soil thermal conductivity difference value,
• wherein a first pipeline heat loss caused by the soil thermal conductivity in a first pipeline segment is greater than a second pipeline heat loss caused by the soil thermal conductivity in a second pipeline segment, and
• wherein a first segment embedding of the first pipeline segment (8, 9, 10, 11, 12), introduced into the trench (15) in a first segment (A, B, C, D, E), in a first water-permeable segment bedding material (16, 17) has a lower thermal conductivity than a second segment embedding of a second pipeline segment (8, 9, 10, 11, 12), introduced into the trench (15) in the second segment (A, B, C, D, E), in a second water-permeable segment bedding material (16, 17).