| 摘要 |
PROBLEM TO BE SOLVED: To provide a side ditch cover with high rigidity and excellent cross-sectional efficiency. SOLUTION: In a concrete side ditch cover 7 where an arch concavity 10 is formed on the central lower face in the lateral direction, a ratio (f/L) between a span (L) between left and right supports 9 and 9 where the side ditch covers come into contact with side ditch blocks 1 and a height (f) of the arch concavity is in the range of 0.10-0.35. COPYRIGHT: (C)2013,JPO&INPIT |
