| 摘要 |
PROBLEM TO BE SOLVED: To provide a segment which can inject a backfilling material in a gap between an excavated wall surface and a tunnel lining without forming a port of a backfilling material injection hole on the inner peripheral side of the segment and is suitable for forming a construction of a tunnel lining part with only a first lining. SOLUTION: A discharging hole 2' of the backfilling material is formed inclined to one side from a front end surface of a hexagonal segment S' to a position reaching the middle between the front and rear end surfaces of the segment in a central part of the front end surface of the hexagonal segment S'. A discharging port 2a to extend from a top end of this discharging hole 2'and open to an outer peripheral surface of the segment S' is formed, and in addition, the backfilling material injection hole 1' to pass through the front and rear end surfaces of the segment S' is formed in parallel with this discharging hole 2'. When the front end surface of the hexagonal segment S'assembled in advance and the rear end surface of the subsequent hexagonal segment S' are joined to each other, the injection hole 1'of the subsequent segment S' is made to communicate with the discharging hole 2'of the segment S'assembled in advance. COPYRIGHT: (C)2005,JPO&NCIPI
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