The karst water-filling mines in Hunan province occur widely, which can be divided into two types. that is, karst water-filling mine and underground river conduit water-filling mine.
Two other cables from the receiving equipment drop in trunking in the central service duct of the tower block and then continue underground in 25 mm polythene conduit.
另外两个电缆从在大楼中央服务管中继接收设备，然后继续下跌地下25毫米聚乙烯管道。
3
Application to a conduit project shows that the system can be applied to the construction and safety monitoring of underground projects surveying.