| 摘要 |
A manhole cover assembly is provided to prevent a manhole cover from falling off from a manhole support even when impact is generated because the concavo-convex region is formed on the manhole supporting board inside. A manhole cover assembly comprises a manhole support(200), and a manhole cover(100) which is placed on the top inner side of the manhole support. The vertical structure part is formed on the upper side of the manhole cover. The angled part is formed on the lower lateral part of the manhole cover. In the manhole support, a separation preventive unit(210) is formed. The separation preventive part operates in the rotation of the manhole cover and has a locking function. In the lower part of the manhole cover, a coupling apparatus(140) which protrudes downwardly is formed, whereof one side has an insertion hole. |
