Loading Capacity of Manhole Cover

1. Classification of #manhole covers

#Manhole covers can be #divided into cast iron manhole covers, steel plate manhole covers, cement manhole covers, composite manhole covers, etc. According to the shape, they can be divided into round manhole covers, square manhole covers, rectangular manhole covers, etc. According to the purpose, they can be divided into rainwater manhole covers, sewage manhole covers, electric power manhole covers, communication manhole covers, etc.

1. Loading Capacities

According to the national standard, the bearing/loading grade of manhole cover is divided into six grades: A15, B125, C250, D400, E600 and F900.

1) A15

Class A15 manhole covers are suitable for low speed areas such as sidewalks and non-vehicle lanes, with a maximum loading capacity of 15KN, which is equivalent to 1.5 tons of weight. This kind of manhole cover is generally used in residential areas, parks, pedestrian streets and other places with large traffic.

2) B125

Class B125 manhole covers are suitable for medium load areas, such as vehicle lanes and parking lots, with a maximum loading capacity of 125KN, equivalent to 12.5 tons of weight. This kind of manhole cover is generally used in urban roads, squares, parking lots and other places.

3) C250

C250 manhole covers are suitable for heavy-duty areas, such as airports, docks, industrial areas, etc. The maximum loading capacity is 250KN, equivalent to 25 tons of weight. This kind of manhole cover is generally used in heavy-duty areas, and its loading capacity is strong.

4) D400

D400 manhole covers are suitable for large-scale projects, such as expressways and bridges, with a maximum loading capacity of 400KN, which is equivalent to 40 tons of weight. This kind of manhole cover is generally used in large-scale projects such as expressways and bridges.

5) E600

E600 manhole covers are suitable for airport runway, port wharf, etc. The maximum loading capacity is 600KN, which is equivalent to 60 tons of weight. This kind of manhole cover is generally used in large-scale projects such as airport runway, port wharf, etc.

6) F900

F900 manhole covers are suitable for special sites, such as military bases, nuclear power plants, etc. The maximum loading capacity is 900KN, equivalent to 90 tons of weight. This kind of manhole cover is generally used for special purpose, and its loading capacity is very strong.

1. Installation of manhole cover

The installation of manhole cover is very important. First, choose the right manhole cover and choose different loading grades according to the actual situation. Second, choose the right well seat. The height of the well seat should match the manhole cover, and should not be too high or too low. Finally, fix the manhole cover. Use corresponding bolts to fix the manhole cover on the well seat to ensure that the manhole cover will not move or tilt.

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