| 摘要 |
PROBLEM TO BE SOLVED: To provide a lid structure in which a lid can be tightly fitted so as to be bitten into the opening of a receiving frame, and even after a strong press-down force acts, the lid can be easily opened by an operator.SOLUTION: In a lid structure 1 embedded for an underground structure for use including: a receiving frame 2 having a circular opening 2b at a surface position P0; and a lid 3 configured to be fitted so as to be bitten into the opening of the receiving frame, the diameters of an inner peripheral surface 2 of the opening and a side section 3d of the lid become smaller by a large ratio according as they go downward, and an inner peripheral surface 2d has a lid stopper section 2e, and the lid includes a bottom edge 3b configured to be butted to the lid stopper section 2e so as not to descend toward a lower side. Height h1 from a lower limit position to a home position is set to a value such that when the bottom edge is butted to the lid stopper section, the lid can be opened with a prearranged power. In this lid structure, the lid can be tightly fitted so as to be bitten into the opening of the receiving frame, and even after a strong press-down force acts, the lid can be easily opened with a prearranged power by an operator. |
