| 摘要 |
A sewer pipe (101) to be replaced is worked, starting from a pit (103) by a cutter head (106), which is braced at the front end of a new pipe (102) to be pressed in from the pit (103). the cutter head (106) is guided in a pipe (101) to be worked during the cutting operation. Said guidance is accomplished by a guide mechanism (113), which is mounted on the front on said pipe and which is pressed with adjustable pressure against the inner wall of this pipe (101) and is slid in said pipe. Thus, the cutter head (106) is prevented from shifting sideways and enables that even reinforced pipes (101) can be worked. The new pipe (102) can be laid on the same level owing to the eccentric adjustability of the cutter head (106) relative to the old pipe (101) despite any eventual change in diameter. (Figure 5)
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