| 摘要 |
PROBLEM TO BE SOLVED: To provide a grating excellent in strength and drainable property. SOLUTION: The grating 5 is installed on a receive frame fixed to the upper opening of a side ditch. The grating 5 is formed in a bottomed box shape provided with a filling space K with the open upper face in which tiles or natural stones can be charged. The bottom face is constituted of a corrugated plate 8 formed of altanate ridges 8a and valleys 8b along the longitudinal direction. COPYRIGHT: (C)2004,JPO
|
