| 摘要 |
PURPOSE:To correct easily distortion extending over the full length of a steel pipe, by fitting a truck provided with wheels whose each length is adjusted to coincide with the inside diameter of the steel pipe, and a hydraulic jack, to the steel pipe, and making it run in the steel pipe by an operation from the outside. CONSTITUTION:A wheel 2 which is made to turn and run by a hydraulic motor 1 is installed by four pieces each to a truck 3, and hydraulic pump 4 is fitted to the center part of the truck 3 so that its axial core conforms with the axial core of a steel pipe. Also, hydraulic jacks 5, 6 are provided in the direction falling at a right angle with the axial core of the steel pipe. The hydraulic pump 4 is stuck to a rotating base 7, is supported so as to be freely rotatable by a bearing 8 of the truck 3, and the supporting shaft of the end of the hydraulic pump 4 is supported to the truck 3 by a bearing 10. Each length of the wheel 2 and the hydraulic jacks 5, 6 is adjusted to coincide with the inside diameter of the steel pipe whose distortion is corrected, the truck is fitted to the steel pipe, the distortion is corrected by making it run to a distortion part by an operation from the outside of the steel pipe, and also the correction is executed by rolling the steel pipe and changing its correcting position. |
