1- Every cross parts
of reinforced ribs on the back of manhole
lid is triangle-shaped and the joint
of reinforced ribs and the lid body
is arc-shaped, resulting in the maximizing
of loading capacity.
2- In order to avoid the turn-over of
manhole lid, a fixing key is available
on the manhole seat to prevent the manhole
lid against turning over and reduce
the possibility of accidents while minimizing
the wearing of manhole lid.
3- Cement fixing slots are available
on the bottom of manhole lid seat to
allow firm installation of manhole lid. |
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