| 摘要 |
PROBLEM TO BE SOLVED: To provide a feed pipe in which the broken piece of the feed pipe after a tunnel excavation is removed and recovered easily irrespective of a breaking direction by forming a plurality of notched pores in the peripheral direction at the place of a breaking. SOLUTION: In the feed pipe 1 being used for reinforcing a natural ground by a grouting in the case of the tunnel excavation and forming a section to be broken at the specified place of a pipe body, the notched pores 12 are formed to the section to be broken 14, and a plurality of the pores 12 are formed along the peripheral direction of the peripheral wall of the feed pipe 1. Accordingly, since the feed pipe can be broken at the place of the arbitrary notched pore, the feed pipe can be broken by selecting the direction of the most excellent workability as the bending direction in the case of the breaking. COPYRIGHT: (C)2005,JPO&NCIPI
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