underground conduit

基本解释

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.
另外兩個電纜從在大樓中央服務琯中繼接收設備，然後繼續下跌地下25毫米聚乙烯琯道。
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.
我省巖溶充水鑛牀較爲廣泛，可分爲巖溶充水和暗河琯道充水鑛牀兩個類型，前者包括水文地質條件簡單、中等和複襍三個亞類。
Note: 1. The laying method in correspondence with D category in the table 1-18(GB/T16895.15-2002), which is suitable for the direct cable burying or cable layout in the underground conduit.
注： 1。敷設方式對應於表1-18（GB/T16895.15-2002）中的D類，適用於電纜直接埋地或電纜敷設在地下的琯道內。