| 摘要 |
A frame (20) for supporting a manhole cover (22) comprises an upstanding peripheral wall (28), support means (40, 42 Figs 3 and 4) extending inwardly from part of the wall to support the cover (22), and an outer flange (30) extending outwardly from a lower part of the wall (28) for anchoring the frame (20) in the ground. The outer flange (30) has a plurality of protrusions or recesses (44) over its outer surface for enhancing the anchoring of the flange (30) in a bedding material and stiffening the frame (20) against bending. The protrusions (44) my be at the corners only. The flange (30) may have wider regions at the corners of a rectangular or square frame. |
