Comparison of concrete manhole covers, composite resin manhole covers and ductile iron manhole covers

1. Cement manhole cover, cement manhole cover is originally used more, mostly used in residential areas and not very obvious some occasions, the advantages of cement manhole cover is very obvious, low cost, with active anti-theft, not easy to lose, and cement manhole cover is generally thicker, but also more anti-theft. The disadvantages are that the cement manhole cover is relatively heavy, the opening is relatively difficult, the bearing capacity is limited, and the heavy car is easy to crack and drop the angle after rolling.

cement manhole cover china

2;Composite manhole covers are free of metal, but some of them with steel bar inside,The weight of composite manhole covers is less than the cement manhole covers. There’s not much value in stealing. The composite manhole covers, generally have polymer materials, glass fiber materials, resin materials ,etc, composite manhole covers have bright colors, active anti-theft or the characteristics, they are more and more widely used. 

Summer high temperature and winter low temperature will make the composite well cover has some aging, some snow removal chemicals are the natural enemy of the composite well cover too. So the composite manhole cover is not suitable for using invery cold area, some of the composite manhole cover bearing is still quite high, but I suggest if the loading capacity is more than 30 tons, composite manhole cover material is best used by SMC.

china composite manhole cover

3:Ductile iron manhole cover, ductile well cover is more rigid, anti-theft type of the use of hinge-type link, compared with the other two types of well cover, ductile iron cover’s cost is slightly higher, but some important high-load occasions, such as urban expressway, urban trunk road, basically still apply more ductile well cover. Ball ink manhole cover because of the hinge link, heavy rain will not shift or wash away, can be said to be more safe and practical, the current developed countries generally only use ductile iron material well cover, many cities also use ductile iron well cover. The disadvantage of this manhole cover is that the price is slightly higher.

The main applications of ductile iron manhole covers are: municipal roads, highways, communications, electricity, tap water, residential areas, schools and other parks.