| 摘要 |
The ground surface access assembly 110, such as a manhole cover, comprises a base frame 112 and a cover 130, which can be mounted in the base frame in a first configuration, and a raising frame, which in a second configuration can be mounted in the base frame and into which the cover can then be placed. The assembly may include packing to reduce movement between the cover and base frame when the assembly is in a first configuration. The packing may comprise one or more elements that can be located between the cover and the frame or alternatively the cover may be formed from two or more elements and the packing 82 may be located, in use, between adjacent elements of the cover. The assembly may include a hinge to allow the cover to be hingedly secured to the raising frame in the second configuration, the hinge being arranged so that when the free side of the cover is raised the hinged side of the cover is also moved out of the raising frame opening. |
