| 摘要 |
<P>PROBLEM TO BE SOLVED: To secure sufficient strength and to reduce costs required for production. <P>SOLUTION: A segment 1A includes a frame body 2 formed in a box shape whose inner peripheral side is opened and concrete 3 placed inside the frame body 2. The frame body 2 includes: a skin plate 4 in a curved plate shape provided on the outer peripheral side; a pair of main girder plates 7 provided respectively on both ends in the axial direction of the skin plate 4; and a pair of joint plates 6 provided respectively on both ends in the circumferential direction of the skin plate 4. On the inner peripheral side of the segment 1A, a plurality of main reinforcements (main steel members) 8 extending in the circumferential direction are arrayed in the axial direction, and distributing bars 20 for fixing the array of the plurality of main reinforcements 8 are provided. A plurality of oblique ribs (reinforcing members) 7 are connected respectively to the pair of main girder plates 7, and the oblique ribs 7 are formed in a dimension shorter than a dimension between the pair of main girder plates 7 and connected to one of the pair of main girder plates 7. <P>COPYRIGHT: (C)2012,JPO&INPIT |
