| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a spreader capable of preventing concentration of stress on a segment by uniformly distributing thrust of a shield jack.SOLUTION: A spreader 18 provided on an end of a shield jack 17 of a shield machine and pushing a segment includes an abutment surface 34 abutted to the segment, and a pressing part 33 pushed by the shield jack 17 is positioned between both ends in a circumferential direction A, and the abutment surface 34 is retreated to a direction opposite from a pressing direction C as approaching the pressing part 33 from both ends.</p> |
