Epoxy or plastic liming may be cast into the concrete pipe during manufacture;or bitumastic or coal tar epoxy may be painted on the concrete pipe surfaces after installation.
可以在制造混凝土管道时
和塑胶衬里浇筑在里面，或在安装后用沥青砂浆或煤焦油屠
混凝土管的表面。
Epoxy or plastic liming may be cast into the concrete pipe during manufacture;or bitumastic or coal tar epoxy may be painted on the concrete pipe surfaces after installation.
可以在制造混凝土管道时和塑胶衬里浇筑在里面，或在安装后用沥青砂浆或煤焦油屠混凝土管的表面。
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