| 摘要 |
A method and apparatus for in-place repair of a section of pipe unduly worn along a portion of its circumference by friction of material fed therethrough. The method includes the steps of marking the ends of the worn pipe section by circumferential lines, clamping the worn pipe section to hold it coaxially aligned and longitudinally in place with respect to the remainder of the pipe and, while thus clamped, cutting the worn pipe section free of the pipe, rotating the freed pipe section sufficiently to displace the worn surface portion from substantial further contact with material to be fed through the pipe, and welding the rotated section to the remainder of the pipe. The apparatus includes two pairs of inner and outer clamps, one pair clamping the worn pipe section at one of its ends and the second pair at its other end. Each inner clamp includes arcuate sleeve portions tightly fastened about one end of the worn pipe section near the marked line delineating the end and a radially outwardly disposed bearing flange. Each outer clamp includes first arcuate sleeve portions fastened to the pipe near one of its junctures with the worn pipe section, second arcuate sleeve portions longitudinally displaced from the first sleeve portions and fastened together to form a bearing surface for coaxial rotation of the worn pipe section, spaced bars disposed outwardly of the pipe to connect the first and second sleeve portions and an inwardly directed bearing plate affixed to the bars for engagement with the bearing flange of the inner clamp to prevent downward longitudinal movement of the worn pipe section while it is being rotated.
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