| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground reinforcing steel pipe suitably used in a prelining construction method in tunneling work or the like, or as a reinforcing member for an excavated tunnel, and constituted to enhance adhesion between an injection material and the steel pipe and to firmly fix the steel pipe to the natural ground. SOLUTION: The steel pipe for reinforcing the natural ground is formed with a spiral projecting line on the outer peripheral part by overlaying and provided with a plurality of through holes in space parts of the spiral projecting line so as to be in communication with the inside and outside to allow the injection material to flow to the outside of the steel pipe. It is preferable to set the height of the spiral projecting line to 1.5-7 mm, the lead to 100-400 mm, and a lead angle to 25-45°. COPYRIGHT: (C)2006,JPO&NCIPI
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