| 摘要 |
<p>PROBLEM TO BE SOLVED: To use a jig regardless of a tube diameter and to improve the jointing workability relative to the jet to be used for jointing the tubes of large diameter from the inside in the laying work of the tube, by utilizing the tractire force in the jointing, expanding the leg parts by utilizing a link mechanism, and press contacting the frictional plates at the points to the tube inner surface. SOLUTION: In the inner surface joining of the reinforced plastic composite tube, the leg parts 2 having the link structure and radially mounted in four directions, are expanded through the expanding and contracting fittings 6 by rotating a front handle 4 mounted on the jig. This jig can be easily moved because the wheel 3 for movement are grounded when the leg parts 2 are closed. Further, the wheels 3 are separated from a travelling surface and stabilized when the leg parts 3 are opened in maximum. When the handle 4 is opened, the leg parts 2 are opened in accordance with the application of the tractire force for the jointing, and the frictional plates 1 mounted on the points of the leg parts 2 are closely contacted with the inner surfaces, so that the jointing of the tubes are executed in this state.</p> |
