| 摘要 |
PROBLEM TO BE SOLVED: To provide a soundness monitoring device which detects a state of sagging displacement in a middle rafter of a terrace roof caused by a snow load to monitor the soundness of the rafter. SOLUTION: A pair of sensor holders 3 having the same lengths of about 1 m or shorter are parallel-disposed at the middle rafter 11 of the terrace roof. A linear impulse type displacement sensor 4 is interposed between the sensor holders 3 so as to be positioned below the center of the middle rafter 11 in the longitudinal direction, and connected to a display device or an information device 6 through a sensor amplifier 5. A wire 33 of the displacement sensor 4 is connected to the center of the middle rafter 11 in the longitudinal direction, the slide elevation of the wire 33 by the sagging of the middle rafter 11 caused by the snow load is detected as a waveform difference of an impressed voltage generated by an effect of an eddy current generated between the wire and an inner coil 42 existing in a metal pipe 41. The state of the soundness and unsoundness of the middle rafter 11 is notified to the display device or the information device 6 by a displacement conversion circuit. The strength of a terrace roof can be individually determined without uniformly treating a 20 cm snowfall in a manual as an unsound state. COPYRIGHT: (C)2011,JPO&INPIT
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