Anti-aircraft sign for aerial photogrammetry of the ore yard

摘要

PROBLEM TO BE SOLVED: To provide an anti-aircraft sign for aerial photogrammetry permanently installed in an ore yard. SOLUTION: A retaining wall 13 which is a structure is connected on a ground surface 10 in an ore yard, and a support 2 of an anti-aircraft sign 1 stands permanently on the retaining wall 13 by an implant bolt 8 at the top of the retaining wall 13. It is installed and fixed. A flange 9a is welded to the top of the support column 2 so as to be held horizontally, and a marking portion 3 composed of an outer marking portion 4 and an inner marking portion 5 is provided with a bolt 6 and a nut 7 or the like with respect to the flange 9a. It is permanently fixed to the support column 2 by a fixing jig. The outer marking portion 4 is the upper surface of the second flange 9b, and the inner marking portion 5 is the outer surface of the hemispherical cap welded to the center of the second flange 9b. The hemispherical cap projects upward at the marking portion 3. In addition to the hemispherical cap, a joint cap for piping having a cylindrical portion at the lower end of the hemispherical shell can be used for the inner marking portion 5. [Selection diagram] Fig. 1