| 摘要 |
PROBLEM TO BE SOLVED: To make a test efficient by providing a liftable intermediate load wheel, a road surface distance measuring device and an intermediate load wheel pressing force measuring device in a tire roller. SOLUTION: A road surface distance can be measured by providing liftably an intermediate load wheel 4 capable of measuring a supporting force between the front and rear wheels of a tire roller 1 and a distance sensor on the shaft or the like of the load wheel 4 so as to measure a road surface distance. Subsequently, when the measurement of deflection equivalent to a deflection test by the Benkelman beam, with the load wheel 4 kept in a non-treading state, the distance to a road surface is measured with a distance sensor, and the coordinate of the distance sensor is measured with a total station. Subsequently, with the load wheel 4 stopping to extend by pressing it against a road surface with prescribed load, the value of the distance sensor and the coordinate are measured, and with the load wheel 4 raised and stopped, the value and the coordinate of the distance sensor are measured, and deflection is computed with a computer 6. Furthermore, a tire roller is moved to the next point of measurement for likewise measurement, thereby measuring deflection with a single tire roller.
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