| 摘要 |
In the method proposed, a sewage pipe (101) which is to be replaced is first removed by means of a cutting head (106) operating from a trench (103), the cutting head (106) being supported by the end of a new pipe (102) pushed in from the trench (103). While the cutting head (106) is cutting away the old pipe (101), the head is guided in the correct direction by a guidance device (113) located at the front end of the cutting head (106). The guidance device (113) is pressed with an adjustable pressure against the inside wall of the old pipe (101) and slides along inside the old pipe (101). This ensures that the cutting head (106) does not stray off line and makes it possible to remove even reinforced pipes (101). The cutting head (106) can be set to advance off-centre, thus enabling to be laid at the same bed level as the old pipe (101) even if the pipe diameters are not the same. |
