| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent pressure loss of a rubber ring 6 without enlarging diameter of SII type joint for jacking. <P>SOLUTION: A space retention material 8 is fitted in a front side of a flange 20 with a roller 24 of a spigot 1, and a propulsion force transmission member 30 is provided in a front side of the space retention material 8. The propulsion force transmission member 30 comprises a ring shape member 31 abutted on a front side end surface of the space retention material 8, and a projection member 32 passing through a pressing ring 9 from the member 31 and abutting on a socket end surface 2a. Propulsion force is directly transmitted to a socket 2 via the space retention material 8 and the propulsion force transmission member 30, and there is no risk of pressure loss of the rubber ring or the like by the propulsion force and press-in of the spigot not to obstacle water tightness of the rubber ring. When the transmission member 32 passes through the pressing ring 9, it is not necessary to project the transmission member 32 to an outside of the pressing ring 9. The space retention member 8 has strength to transmit propulsion force, and contracts or breakage against strong compression force such as earthquake to allow insertion of the spigot to the socket. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
