First, what is the size standard of manhole cover?

In fact, in terms of the current use, there are many types of manhole covers, not a single one. In general, 600mm, 700mm, 800mm are more common, the use of a lot. But the most commonly used is 600mm. But there are also some in 550mm, the utilization rate is also relatively high. But no matter what size standard, the selection requirements are based on the load-bearing and the use of the environment to make the choice, so not any one in the use of the manhole cover is arbitrary choice.

Second, the choice of manhole cover size actually depends on many aspects

On the one hand, the country has very strict requirements for the use of manhole covers. There are single-layer, composite, cast iron and other types in the selection of types. Each type has certain differences in strength and load-bearing when it is used. However, according to the relevant regulations, there are strict requirements for the type of manhole cover to be selected. For example, the type of manhole cover to be selected for green belt and sidewalk is different. The main reason is that the number of people in and out of these places is different, and whether there are vehicles passing by and the traffic volume is different It’s not the same, so it’s not surprising that there are differences in the selection of manhole covers.

On the other hand, the standard of manhole cover size is different in China or Japan. In China, there will be special regulations on the size standard and use requirements of manhole covers, while in Japan, there are also regulations on the manhole covers they use, both in size and material, but the requirements are different from those in China. So the size of the manhole cover selection or the use of standards, in fact, often in different regions will have great differences. It can’t be unified.