| 摘要 |
PROBLEM TO BE SOLVED: To attain highly accurate measurement, long-term outdoor installation and read at a distant place from a measurement point by forming a gage so that a graduation line and an index line flatly intersects with each other in an installed state and measuring travel of the intersection of the graduation line and the index line due to displacement caused. SOLUTION: The displacement measuring gage comprises a flat plane A equipped with a graduation line 1 on a side of a plane (a) and a flat plane B equipped with a plurality of index lines 2 marked with an angleθwith respect to a shorter-side direction line having an equal length to that of the graduation line 1. The flat plane B is fixed to one of sides across a crack so that a displacement direction line S aligns with a displacement direction. Then the flat plane A is fixed to an object to be measured to overlap on the plane B to the other side across the crack so that the graduation line 1 is orthogonal to the displacement direction line 1 and intersects with at least one of the index lines 2. When displacement occurs on the object, the planes A, B are displaced in the displacement direction in opposite directions respectively, resulting in movement of a reading intersection 4 which is the intersection of the graduation line 1 and the index line 2. Thus this moving amount is measured to obtain an actual displacement amount.
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