| 摘要 |
PURPOSE:To eliminate the influence of the long-time irradiation of the direct sunshine and to take an accurate measurement by linking plural tanks by water channels and moving water, and positioning a load cell from which a weight is suspended in each tank. CONSTITUTION:When settlement is measured, a gate 34 is opened and then the water level in a water level adjusting tank 3 drops, so that the water level in each tank 1 also drops to the height of the gate 34 of the water level adjusting tank 3. Then, weights 14 appears over the water surfaces, and when a structure sinks irregularly, the exposure states of the weights are different from the states when a reference value is measured, so values applied to the load cells 13 are different. This load is converted into settlement to know settlement from when the reference value is measured. Further, the gate 34 of the water level adjusting tank 3 is closed to supply water into the respective tanks 1 by a pump P and then the water in the water channels move at any time; and the water temperature in only one tank 1 never rises, and consequently the temperature difference of the load cells 13 has no error, so that an accurate measurement is taken.
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