| 摘要 |
PURPOSE:To measure the transfer speed at a low cost and in a real time at any time by embedding transmitting and receiving ultrasonic sensors in both face sides of a concrete plate, and measuring an ultrasonic wave which transmits through the inside of the concrete plate. CONSTITUTION:For instance, after constructing a form 7 of a floor slab, an arrangement of bar of the floor is executed, a sensor (ultrasonic probe) 2 and a pipe 4 are set to a measuring position which is set on the form 7, and concrete 1 is placed. Subsequently, a sensor 3 is embedded into the concrete 1, and their surfaces are set to the same level. In this state, an ultrasonic wave of prescribed wavelength is transmitted from the sensors 2 (3), a transmission wave is received by the sensors 3 (2), and its transfer time is derived. From this transfer time, and a distance l between the sensor 2 and 3, a transfer speed of an ultrasonic wave in the concrete 1 is derived. Based on this transfer speed, strength of the concrete 1 can be estimated. The distance l is measured in advance, and inputted to a control unit 6. In the pipe 4, wiring of the sensor 2 is performed, and connected to the unit 6 through a plug 5. |
