Mechanical methods
Cleaning with cleaning apparatus
Depending on the degree of pollution and the nominal size of the pipe, hand winches or motor winches with pull forces of 5 kN to 20 kN and 25 kN to 50 kN respectively are used [Führb1980]. The use of these cleaning tools in non-accessible sewers has shown good cleaning results.
The section by section assembly of the winch system as well as the insertion of the winch cable and the cleaning devices is a very complex, time consuming and physically demanding procedure. Therefore this method should only be applied in cases where the respective sewer lengths cannot be reached by heavy-duty vehicles [ATV1995a].