| 摘要 |
A drainage grating is provided to secure safety in walking, and to solve the problems caused by various impurities flowing inward from the outside. A drainage grating for filtering out impurities of the appointed size and draining off rainwater only comprises a grating main body(2) having a drainage passage(H) between connection plates(P), and a filter device(4) filled in each drainage passage and provided with water permeable pores to let water pass through, wherein the grating main body is composed of a circular or polygonal plate having many drainage passages formed at a certain space, and the filter device is composed of water permeable filler having water permeable pores(F) for drainage. |
