| 摘要 |
<p>A cast-iron tunnel lining segment (10) of generally rectangular configuration having two opposite edges arranged in use to face axially of the tunnel lining, and the alternative two opposite edges (8,9) arranged in use to face circumferentially of the tunnel lining, the segment being curved in the circumferential direction concave inwardly; the circumferentially facing edges of the segment being provided with flanges (6,7) disposed adjacent thereto, and adapted to receive means for interconnecting the segment with other circumferentially adjacent segments, the flanges (6,7) being directed inwardly of the segment and each connecting with the inner side of the segment at a root inset from the circumferential edge of the segment; and a plurality of ribs (12-16) extending from the flanges to the adjacent circumferentially facing edges of the segment, the ribs being machined on their circumferentially facing edges to provide radially aligned surfaces adapted to engage with corresponding surfaces of circumferentially adjacent segments to form a lining ring, and strengthening rib continuations of said ribs extending between the flanges disposed adjacent the circumferentially facing edges of the segment.</p> |
