Spherical Cast Iron Manhole Cover 500600 Drain Grate Common D400 Load Capacity 25 Tons Long-life Fire Hydrant Cast Iron Cover Plate


A common anti-jump cover design utilizes anti-jump rubber strips, which can absorb the impact force on the manhole cover during vehicle movement, reducing its bouncing amplitude. Additionally, by filling the gap between the manhole cover and the frame, adding extra fixing devices, and using structures such as locks or grooves in certain special cases, the stability and safety of the manhole cover can be further improved.

Another anti-jump cover design ensures smooth vehicle travel while achieving more stable anti-jump effects through traditional anti-jump rubber strips and an optimized manhole cover structure. For example, certain types of bridge-style manhole covers use bolt fastening methods to secure the cover to the frame, thereby enhancing overall stability.

By combining the above two designs, ductile cast iron manhole covers can effectively avoid safety and noise pollution issues caused by cover bouncing during vehicle travel, providing a safer, more convenient, and cleaner passage environment for urban transportation.