| 摘要 |
PURPOSE: A manhole cover is provided to prevent the generation of noise by the cover and the separation of the cover from a manhole. CONSTITUTION: A manhole cover comprises a support part(10), a first side cover part(20), a second side cover part(30), and a center cover part(40). The support part is installed on the top of a manhole and has a top opening and an inner rim(12). The first side cover part is connected to one side of the support part by being placed on the inner rim. The second side cover part is connected to the other side of the support part by being placed on the inner rim. The center cover part is placed between the first side cover part and the second side cover part. |
