| 摘要 |
PURPOSE: A tubular structure having a polygonal section passage is provided to optimize a passage section as a loading gauge of vehicles for passing through a conduit. CONSTITUTION: A tubular structure having a polygonal section passage comprises one or more conduits having a polygonal section passage and is made of sections, mounted on a laying surface which is horizontal and compact. Each section comprises a lower support structure(1) and a reverse U-shaped cover member(2). The lower support structure is partially manufactured in advance and is arranged on the laying surface. The reverse U-shaped cover member is placed on the support structure. |
