Patent ID: 8540454
Filing Date: 2013-09-24
Classification: E02D

Abstract:
1. A manhole cover, comprising a lower body, the inside of which is hollow, with a spiral rib formed along the inner surface of the hollow space, and convex-concave portions formed on the upper surface of the spiral rib; an upper body which is coupled with the lower body inside the latter, and the inside of which is hollow, with a spiral rib and convex-concave portions formed along outer surface of the upper body to correspond to the spiral rib and convex-concave portions of the lower body, and a stepped portion formed at the upper surface of the upper body; a lid mounted on the stepped portion of the upper body to prevent the ingress of foreign matter into the inside of the upper body; and a waterproofing means removably arranged inside the upper body to prevent the ingress of rainwater into the inside of the manhole, wherein the waterproofing means comprises: