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The existing manhole covers work relying on their gravity or are simply glued to the holes, so there remain many potential safety hazards especially in a rainy day. When it rains, the covers are very likely to be washed away by the rainwater so that the pedestrians may fall into the holes and cars are possible to get stuck. Our design is added around the cover with 4 bumps which can perfectly fit the surrounding groove. Consequently, the covers’ adhesion to the ground will be greatly increased. Even when there is too much water, the manhole covers will not be washed away. Thus, some accidents can be efficiently avoided.
Jianjian Li Lanqiang Pan Lishan Feng Jiang Wu