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地圖上最美的問號--千里做步道,石階篇之六--擋水石階

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Uploaded by on Sep 21, 2008

領隊泰德講解擋水石階
擋水石階適用在較緩的斜坡,隔一段距離設置,以讓水減緩速度,石頭寬大的面要垂直插入土中,埋入深度至少約石塊的三分之二方為穩當,突起的部分用以留住土壤作為踏面,而水­亦能透過石塊引導而逐步滲入地下。
●擋水石階要與步道垂直九十度角,立放要超過三分之二深,且盡可能不要挖過寬,以免搖晃。
●擋水石階旁用以固定的石階,要挖與擋水石階垂直的方向,確保整個擋水石階稍大於步道寬度。
●若石塊大小不夠符合,可用鑿子修正;過大要分成兩半,可用鑿子鑿出小洞,塞入木楔子,用大搥子敲打,使石頭迸裂。
●擋水石階的埋設,要反覆調整到突起來的部分是一個平面。兩側固定石塊要塞滿縫隙,使石階不易搖晃。
●在擋水石階的上坡路面,填塞一層碎石但不要跟石階高度等高,兩者落差少於六英吋即可,以留溝槽擋住水土,再以大搥敲擊紮實,鋪上一點點廢土跟落葉。

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