Patent ID: 8540454

Claim:
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: a waterproofing plate which is seated on a catching projection formed on the inner surface of the upper body to prevent ingress of rainwater; a first packing member attached to edge of said waterproofing plate so as to wrap the edge, upper portion of the member being extended to upper end of the waterproofing plate and lower portion being in close contact with the catching projection so as to wrap the edge of the waterproofing plate; and a pressing ring arranged over said waterproofing plate and pressing the first packing member extended to the upper end of the waterproofing plate into close contact with the inner surface of the upper body, thereby achieving a tight waterproof.