| 摘要 |
<p>The object is to improve the inner wall (11) of an underground sewer consisting of concrete duct sections (4a) by lining it with a shell formed from prefabricated elements (13) which on one side carry undercut protusions (15), and by injecting a hardening grout (41) into the space (12) between the wall (11) and the shell. The prefabricated elements, with protrusions, are placed in the sewer via the existing entrances after having been flexed to reduce their radial bulk. Then they are allowed to spring back spontaneously in the sewer so that they position themselves at least approximately facing the inner wall of the sewer.</p> |
