| 摘要 |
The present invention relates to a twist-locking manhole and, more specifically, to a coupling structure of a manhole frame and a manhole cover placed on the manhole frame to cover the manhole frame, wherein the coupling structure of a manhole frame and a manhole cover is capable of preventing the manhole cover from being separated and lost by placing and rotating the manhole cover on the manhole frame and locking a locking unit installed on the underside of the manhole cover with a manhole protrusion formed on the inner surface of the manhole frame. The present invention, in a manhole having a configuration including the manhole cover and the manhole frame having the manhole protrusion supporting the manhole cover when the manhole cover covers the manhole frame, provides the twist-locking manhole having the configuration including at least one protrusion from a lower supporting body formed on the underside of the manhole cover to be locked by the manhole protrusion and at least one insertion groove on the manhole protrusion to allow the protrusion to be inserted under the manhole protrusion and preventing the manhole cover from being lifted again or being separated by rotating the manhole cover to lock the protrusion with the manhole protrusion after inserting the protrusion under the manhole protrusion via the insertion groove when the manhole cover is fitted into the manhole cover in order to form a locking means for preventing the manhole cover from being separated or lost. |
