Process for renovating damaged portions of a sewer duct laid in the ground

摘要

Damage in a sewerage system is eliminated by a so-called renovation from within the sewer duct, without carrying out excavation work. In the process according to the invention, it is exclusively the damaged region of the sewer duct which is renovated. This region is normally very short in comparison with the distance between two inspection shafts. In order to carry out the renovation, first of all radial bores 6 or slots are made in the sewer-duct wall, or the wall of the damaged area A is removed completely or so as to leave a relatively thin-walled outer layer 3. A pipe 4 serving as shuttering is then introduced into the sewer duct, and the free spaces, including the annular space, achieved by removing the wall are filled in with a sealing compound 5. The pipe 4 can remain in the sewer duct or else be withdrawn. Provided that work is carried out on the damaged area A so as to adapt the contour in this region to the contour of the rest of the sewer duct, the pipe may also be destroyed. IMAGE