| 摘要 |
PROBLEM TO BE SOLVED: To fix an indicator pole by the upper and lower end parts of a sheath pipe buried in the ground, and stably fix the indicator pole over a long period by a fixture which is never freely moved even if it receives an external force such as vibration, or it is expanded or contracted. SOLUTION: A sheath pipe 4 to be buried so as not to be protruded from the ground has a circumferential groove 6 on the upper end inner surface, and a fixture 7 having a circumferential protruding part 10 is fitted to the upper end part of the sheath pipe 4 to fit the circumferential protruding part 10 to the circumferential groove 6. When an indicator pole 1 having a slit part 3 is fitted thereto, the upper end part of the sheath pipe 4 is fixed through the fixture 7, end the slit part 3 of the indicator pole 1 is fitted to a fixing pin 5 provided on the lower end part of the sheath pipe 4 to fix the sheath pipe 4 to the indicator pole 1 in both upper and lower end parts. |
