post tunnel portal 中文意思是什麼
post tunnel portal
解釋
柱式洞門-
In china, traditional portal of railway tunnel can be sorted as three types - origin, modified and special types, inclusive of 16 kinds on basis of the characteristic of terrain, basically they are of end wall and post type
我國傳統鐵路隧道洞門根據地形特點分為基本型、變化型、和特殊型三大類十六種形式,但始終脫離不了端墻、柱式的形式。
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