| 摘要 |
PROBLEM TO BE SOLVED: To secure safety of walking and passing, by surely preventing a slip when a pedestrian and a bicycle pass, while being suitable for blocking up an opening part in an underground structure.SOLUTION: A slip prevention part 10 is provided on a surface of an iron cover body 1 of a plane shape corresponding to an opening part shape so as to be placed on the opening part edge for blocking up an opening part positioned on the ground surface in the underground structure. The slip prevention part 10 is arranged by opposing the four sides of a second slip prevention area 21 to respective outside corner parts of a first slip prevention area 11, by combining the first slip prevention area 11 provided with first corner projection bodies 14 and a first central projection body 15 each having an inclined plane on an upper surface of a first protrusion part 12 presenting an L shape in a plane and the second slip prevention area 21 provided with second corner projection bodies 24 and a second central projection body 25 each having an inclined plane on an upper surface of a second protrusion part 22 presenting a square shape in a plane, in a pair shape by opposing inside corner parts in the first slip prevention area 11. |
