The sewage manhole cover is very important in the municipal manhole cover series. Because the water in the sewage well is dirty sewage, the safety degree of the manhole cover is very important. Only qualified sewage manhole cover can fully meet the use requirements.
The factors that affect the size selection are as follows: 1. On the one hand, the country has very strict requirements for the use of well covers. There are several different types of single-layer, composite and cast iron in the selection of types. But according to the relevant regulations, the selection of manhole cover type is actually strict, for example, the type of manhole cover used by green belt and sidewalk is different, mainly because the number of people entering and leaving these places is different, and whether there are vehicles passing by, the traffic flow is also different, so it is not surprising that there will be differences in the selection of manhole cover.
On the other hand, the standard of manhole cover size is different in China or other countries.. in China, the size and use requirements of well cover are governed by specific laws and regulations, while in other countries, the use of manhole cover is also regulated, regardless of its size or material, but does not meet the requirements of China. Therefore, the selection of manhole cover size or the standard of use, in fact, are often very different in different hell, can not be unified.