| 摘要 |
<p>The method is for the improvement of pipe lines or ducts laid under the earth and which are subject to wear, particularly drainage water ducts or sewage pipes. It involves the placing inside the pipe (1), at least on the lower side of the walling, thin-walled sections (3) of bearer material. The material is lined on both sides with a plastics and the sections are positioned in a stepped fashion, joined to one another. Between the walling and the sections there is a hollow space which is filled with suitable material and the attachments between the sections are also lined with plastics.</p> |
