| 摘要 |
The invention is heat insulation for an underground water pipeline with well (10, 11) that consists of an air layer (19) that is formed in the well between two elastically flexible cones (16, 17) that are at an axial distance from one another. These cones are suspended at their tips with the base edge in sealing contact with the well walls to form an airlock in the well.<IMAGE> |
