| 摘要 |
In order to ensure that a manhole/inspection cover or grating is firmly seated in a road or other surface within which it is installed and is substantially non-rocking, it is supported on opposite sides by two frame members each of which comprises two seating blocks joined together by an elongate bar. The seating blocks have angled seating faces which are inclined downwardly towards each other and which are engaged by correspondingly inclined angled faces on the cover or grating. Furthermore the bar is provided with an additional angled seating face which is inclined in a direction transverse to the longitudinal axis of the bar and is engaged by one or more correspondingly inclined angled faces on the cover or grating. Optionally the or each frame member is double-sided, that is it incorporates a respective additional angled seating face on each side of the bar, so as to support two covers or gratings in side-by side relationship. |
