| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete strength estimation method capable of simply and highly accurately estimating the strength of a concrete structure.SOLUTION: The concrete strength estimation method causes control means 7 to estimate concrete strength of an existing concrete structure W using a boring device 1 that has a boring part 41 for boring a hole Wa in the concrete structure W. In the estimation method, boring speeds are preliminarily measured with respect to concrete strength of respective concrete structures as targets; a relationship between the concrete strength and the boring speed is identified on the basis of the measurement results; and when boring the hole Wa in a concrete structure, the control means 7 measures a boring speed at the time of boring with a feed speed of the boring part 41 controlled at a constant level with a constant torque electric motor 32, and estimates the concrete strength from a change in the measured boring speed, as the concrete strength of the concrete structure W. |
