| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a segment with improved high strength. <P>SOLUTION: This segment 1 constitutes a cylindrical wall body in an excavated hole by connecting these segments in the peripheral direction and further in the axial direction. This segment 1 is constituted by a frame body 2 formed into a box shape having an opened inner peripheral side and concrete placed in the frame body 2. A rib 7 is stretched over a pair of main girder boards 5 forming the frame body 2, a plurality of main reinforcements 8 extended in the peripheral direction are arranged on an inner peripheral side and an outer peripheral side of the rib 7, and a distributing bar 20 wound around the main reinforcement 8 to restrain it is provided by fixing it on the rib 7. <P>COPYRIGHT: (C)2011,JPO&INPIT |
