| 摘要 |
Provided are a method and device for performing work in pipelines, whereby it is possible to exert an extremely large driving force within a pipeline. Moreover, provided are a method and device for performing work in pipelines, which are provided with a means for forcibly drying the wet inner surface of a pipeline. The device is provided with an annular pressure boundary seal with a free-end portion that comes into contact with the inner wall of the pipeline. The seal separates the space within the pipeline into two spaces, space (A) and space (B), using the seal as a boundary. The end of space (A) adjacent to the seal is connected with a suction pump via a hose, while the other end of space (A), which is not adjacent to the seal, is connected with the fluid surrounding the pipeline via a vacuum breaker that adjusts the negative pressure within space (A).; A hose is disposed in space (B) and the end of space (B), which is not adjacent to the seal, is connected with the fluid that surrounds the pipeline. |
