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本文介绍了一种结构简单、价格低廉的井下巷道用的顶板岩层运动早期警报指示器。当顶板超过预定的位移量时,荧光指示棒掉出,发出警报。整个装置可按所要求的深度装入钻孔中,以避免放炮时受到破坏的可能。
This paper presents an early warning indicator of roof strata movement in underground tunnels with simple structure and low price. When the top plate exceeds a predetermined amount of displacement, the fluorescent indicator falls out and gives an alarm. The entire unit can be drilled into the borehole at the required depth to avoid damage during blasting.