北宜高雪山隧道~穿山遁地全速21@Bluejohn旅行趣|PChome Online 人新台
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北宜高雪山隧道~穿山遁地全速21

雪山隧道(7)

今天介TBM施工的面,昨天者挖面形的差,其者的挖半也有些差距。未隧道完工後,在其上3.5公尺的道,中山高道3.75公尺窄,各留1公尺的度作修或逃生的步道,高限制4.6公尺,在上方置照明通施,另外在道的下方下水道施,隧道的水收集至此排放。不在施工段,下水道施可是送洞外新空的孔道。

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