Anti-settling round cast iron manhole covers

The anti-settling manhole cover is made of nodular iron, and the connection mode between the well cover and the well body is changed to socket type. The load from the upper part is dispersed to the road structure layer; It can reduce the load of well body by more than 80% and prevent settlement. Prevention of theft; Noise prevention; Prevent odor; Prevent the manhole cover from jumping, shaking and displacement; Prevent accidental opening; Prevent accidental closure; Significant anti-slip effect; Easy to open and clean.