| 摘要 |
PURPOSE:To foresee the degradation of a slope and give an alarm by a method in which relative displacements between a pressure-receiving part in contact with a slope protective frame and an anchor rod fixed to the ground through the pressure-receiving part is detected by a detection mechanism. CONSTITUTION:Cement mortar is beforehand injected into the ground of a slope, an anchor rod 13 is penetrated under the condition that a case 18 incorporated with a spring 22 is fixed to a slope protective frame 12, and a cover 19 is screwed with the thread provided on the periphery of the case 18. When excessive soil pressure is applied to the slope protective frame 12 containing water, the case 18 on the protective frame 12 is also displaced relatively toward the outside in relation to the anchor rod 13, the actuator of a switch 23 is contacted with the inner side of the anchor rod 20, and the switch 23 is operated. The signal is then sent to an alarm device provided near the slope and a road control office and an alarm on the degradation of the slope is given to vehicles, etc. |
