According to the material: there are metal manhole covers, such as cast iron, ductile iron, bronze manhole covers; High strength steel fiber cement concrete well cover; Reclaimed resin manhole cover; Polymer matrix composite material inspection manhole cover, etc.
Divided by shape: mainly round and square. Round manhole cover is not easy to tilt, can better protect the safety of pedestrians and vehicles, often used in urban road administration; Square manhole covers are widely used in rural areas and cable Wells to better prevent rainwater and other liquids from entering.
According to GB/T23858-2009 "Check manhole cover", the manhole cover carrying capacity is divided into six grades, from A15 to F900, which are suitable for different areas, such as green belt, sidewalk, residential district, urban trunk road, freight station, airport runway, etc.
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