| 摘要 |
The invention relates to a device and method for opening a branch section closed in connection with the renovation of a pipeline. The opening device comprises a body part (4) dimensioned to be essentially smaller than the diameter of the pipeline, which is provided with a fluid-driven drive motor. To the output shaft of the motor is connected a rotating opening tool (5) and to the body part is connected a fluid tube (6) of flexible but pushable material, by means of which the opening device can be pushed inside the pipeline, also past any bends, to the branch to be opened. When the fluid tube is pressurised, it becomes rigid so that the opening device can be pushed with sufficient force against the surface closing the branch section (2) opening to be opened. |
