| 摘要 |
<p>A pipe-bending machine suitable for use on continuous pipelines 4, especially underwater, comprises first and second means 6, 17 for engaging one side of a pipeline 4 at locations separated along the length of the pipeline, and third means 12 for engaging the other side of such a pipeline between the first and second means. means 7 is provided to urge at least one of the first, second, and third means towards the pipeline so that the first, second, and third means co-operate to apply a bending stress to the pipeline. The machine is characterised by a portion 9, 12 that is arranged to be closed round a pipeline 4 and opened to permit the machine to be positioned round and removed from the pipeline. A mandrel suitable for use within such a pipeline 4 under construction comprises an axial core 301, a plurality of bowed staves 308 extending along the core, means 309, for decreasing and increasing the axial length between the ends of the staves, thereby causing them to bow out to a greater and lesser extent and to grip and release the pipeline, and a plurality of annular segments 310 disposed around the core within the staves and provided with means 311 for causing them to expand and clamping them firmly against the inside of the pipeline 4. <IMAGE></p> |
