LID FOR UNDERGROUND STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a lid for an underground structure, which blocks an opening communicating with the underground structure and formed in the ground, at a height that is flush with the ground surface, wherein the lid is effectively prevented from degradation of the anti-skid performance of protrusion bodies thereof even if abrasion of the protrusion bodies develops. SOLUTION: The lid for the underground structure is formed of: the protrusion bodies 10 protruding upward; and overhanging bodies 16, 17 overhanging sideways from respective side surfaces 11, 13 of each protrusion body 10, and having polygonal upper surfaces 161, 171 at a height lower than a protruding end face 12 of each protrusion body 10. When the protruding end face 12 of the protrusion body 10 is worn out to such an extent as to have the same height as that of the upper surfaces 161, 171 of the respective overhanging bodies 16, 17, the number of corners of a contact surface T1consisting of the protruding end face 12 and the upper surfaces 161, 171, is larger than the number of corners 121 of the protruding end face 12. COPYRIGHT: (C)2009,JPO&INPIT