| 摘要 |
<p>There is a disclosed a liner (5) used by inserting the liner (5) into a heat-shrinkable cylinder (4) in case of mutually connecting pipes (2,3) by using the heat-shrinkable cylinder (4) made of a shape memory alloy. This liner (5) is characterized in that an external wall is formed in a sleeve shape and with metals so as to continue compactly, one or a plurality of first projections (51,51) continuing along an external direction to both sides except the center portion (50) are formed on the internal surface, a plurality of second projections (52) placing side by side in an external direction at a predetermined interval are formed in an arbitrary cross section toward the positions close to both end portions of the first projections (51,51), and the diameter R of a circle binding the mutual corner portions of the second projections (52) along an external direction is set to be equal with or slightly larger than the diameter r of a circle formed by the corner portions of the first projections. When the heat-shrinkable cylinder (4) is heated and shrunken, the corner portions of the second projections (52) cut into the surfaces of the mutual pipes (2,3), and the connection portions of the mutual pipes (2,3) are reinforced against the external force in a torsional direction. <IMAGE></p> |
