SEGMENT RING AND SHIELD TUNNELING METHOD

摘要

PROBLEM TO BE SOLVED: To realize a shield tunneling method high in workability and suitable for maintenance of the shield or the like. SOLUTION: A segment ring 1 having an outer circumferential surface whose outside diameter is formed in such a way that it is gradually increased from a small diametral segment ring 21 for forming a sharply curved line a large diametral segment ring 20 for forming a straight line is arranged between the segment ring 21 and the segment ring 20, and a slope is formed along the outer circumferential surface of the segment ring 1 to the level difference formed by the difference in the diameters.