| 摘要 |
An underground structure cover comprises a cover body ( 10 ) and a receiving frame ( 20 ) arranged so that the cover body is fitted in and supported by the receiving frame in the manner that an inclined surface ( 11 ) of the outer circumference of the body meets an inclined surface ( 21 ) of the inner circumference of the frame. The inclined surfaces ( 11, 21 ) each have an upper inclined surface ( 11 a , 21 a) and a lower inclined surface ( 11 b , 21 b), and the lower inclined surfaces ( 11 b , 21 b) are steeper than the upper inclined surfaces ( 11 a , 21 a). The body ( 10 ) is fitted in and supported by the part ( 20 ) at the upper inclined surfaces ( 11 a , 21 a) and the lower inclined surfaces ( 11 b , 21 b). By this, the body is prevented from being wedged into the frame too deeply and also from becoming inclined with respect to the frame or riding up.
|
