1: slip covers the surface raised using the 3mm pattern, which plays a good role in anti slip。
2 shift: well ring reserve four rivet bolt hole with 90 degree uniform distribution, each using 4 anchor bolts, eliminates the shift in the road construction process for mechanical rolling occurs, and played a certain security role。
3: This is the biggest damage characteristics of ductile iron manhole cover, heavy ductile iron manhole cover bearing 36T/60T, light pressure 21T。 Even if the load pressure exceeds the limit, ductile iron manhole cover and manhole cover that unlike ordinary broken, but a slight deformation, has a certain safety of cars and pedestrians。
4 earthquake: through the well mouth of the ring are arranged at the U slot, with T type synthetic rubber strip, embedded U groove, in the contact process of the manhole cover and the well ring in order to play a buffer role, reduce the vibration force.
6 Security: in the manhole cover on the outer ring of a square convex groove, the inner wall of the manhole cover opening ring end through the shaft fixing shaft is connected with the well cover, the other end is arranged in the inner wall of the pin body are fixed, and play a security role, when open the covers placed 90 degrees when it covers, convenient for construction.
Using the built-in nylon lining, never rust, and equipped with a special tool to open, safe and reliable。
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