Why is the purpose or logo on the manhole cover?

It's very simple, if the manhole cover is not marked with the purpose, it is impossible to distinguish which manhole cover is used for, there are too many manhole covers on a road, in case there is a problem with which manhole cover needs to be repaired, and even if this manhole cover is used for, the follow-up work is not good, and even accidents will occur in serious cases.

Therefore, the manhole cover must be marked with what the manhole cover is used for, like various types of manhole covers of Zhenjin in Hunan, which will indicate whether it is a rainwater well, or a sewage well, a power manhole cover or a communication manhole cover, and some will also indicate the unit to which the manhole cover belongs, which is more conducive to municipal management.

Information. I.

Concern. The sign on the manhole cover tells you who is in charge.

Safety siren. Concern.

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Why do women want their husbands to eat more cistanche, it turns out to be this reason!

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Why should a woman let her husband eat more of it, it turns out that this is the reason!

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3 catties of wolfberry is not as good as 1 tael of it, soak in water every day to drink, the complexion is good and does not show old, convenient and practical!

After this newspaper's report on the road surface problem appeared in the newspaper, it aroused extensive discussion among the citizens. Citizens have asked this newspaper questions about road infrastructure problems such as uneven manhole covers and damaged road surfaces. So, which unit does the management of road infrastructure belong to?

Which unit should members of the public report to when they find out about the problem?

According to the shape, the manhole cover is round and square, but most of the ones we see in life are round, because the round is more convenient to use, and the material is saved, and it is not easy to fall to the bottom of the manhole cover.

According to the material, there are ductile iron manhole covers, composite resin manhole covers, stainless steel manhole covers and cement manhole covers, etc., the material of different manhole covers can be applied to different ranges, the most commonly used is ductile iron manhole covers, such as Hunan Zhenjin's "five prevention" ductile iron manhole covers, the load-bearing capacity is higher, can load heavy vehicles within 60 tons, the scope of application is wide, and the manhole cover well ring is a conjoined design, which can effectively solve the problem of anti-theft. At present, the manhole cover made of ductile iron is basically used in municipal road facilities, which has high safety performance and has a certain guarantee for the safety of people and vehicles.

In addition, according to the load-bearing, the manhole cover is divided into six grades of ABCDEF, and the bearing pressure of different levels is different, which is made according to national standards, and the appropriate load-bearing grade should be selected for the corresponding regional range.

The manhole cover is only the appearance, and what is hidden underneath is the hidden works of the municipal public infrastructure. And the manhole cover is the entrance to them.

The pipes with manhole covers in the city are generally divided into water supply pipelines, power pipelines and cable trenches, municipal pipelines, and communication pipelines (telecommunications, mobile, Unicom, radio and television, etc.).

Let's talk about the water and sewer pipes first. Among them, the water pipe (water supply) cannot be shared with other types of pipes, so there are water manhole covers on the ground. Sewage is also not shared with other types of pipes, so there are more sewage manhole covers on the ground.

If the city has implemented rainwater and sewage diversion, then there will be a special rainwater manhole cover. If there is central heating in the north, there will also be heating manhole covers on the ground.

Then there are the power pipes. Electricity is generally relatively simple, just a kind of power manhole cover. However, near the substation, the power manhole cover is generally not used, but the power cable trench is built directly, that is, a road is a rectangular cover.

After that, there are municipal pipelines and communication pipelines. The internal of municipal pipelines is similar to that of communication pipelines, which are basically communication lines. The difference with a separate communication pipeline is that a municipal pipeline can be used if there is a municipal pipeline on site, and the internal space is sufficient and the use permit is obtained.

There is no need for various operators and public security traffic management units to build duplicate tube wells. In the future, the underground pipe gallery (common ditch) in developed countries is the development direction of municipal pipelines. At the same time, it is also hoped that it is the end point of the above various manhole covers.

Rainwater, sewage, tap water, electricity, communications, etc.

You don't have to open it to know what kind of manhole it is.

The most common signs are water, water, and rainwater. The upper water is the tap water supplied by the water supply pipes, which enters the clean water of the user. Sewer is sewage discharged from drain pipes. Rain is the meaning used to drain rain from the road on a rainy day.

There will be a lot of underground pipelines in the urban building section, such as sewers, underground gas pipelines, water pipelines, power pipelines, communication pipelines, national defense pipelines, etc., these pipelines should have an outlet to the ground every other section, and the section from the pipeline to the ground is called a manhole, and the manhole mouth is usually flush with the ground, so a cover is needed to cover the cover of the manhole, called the manhole cover. Manhole covers are usually made of reinforced concrete, metal, reinforced plastic and other materials, and the shape is mainly round and square. On the manhole cover, it is generally necessary to indicate the purpose of the underground pipeline and the custody unit and other information.

Manhole covers, which are used to cover roads or deep wells in homes to prevent people or objects from falling.

According to the material, it can be divided into metal manhole cover, high-strength fiber cement concrete manhole cover, resin manhole cover, etc. It is generally round. It can be used for green belts, sidewalks, motorized lanes, docks, alleys, etc.

Conform to standards. In China, most manhole covers do not fit tightly with the road surface, and the tires will collide with the manhole cover when the vehicle is pressed, so the manhole cover has become one of the sources of noise in the city. In the 70s of the 20th century, many Japanese people suffered from the noise of manhole covers, and asked the local government to solve the "noisy manhole covers".

Japan** immediately revised the standard of sewer manhole covers, changed the cylindrical manhole cover to a conical manhole cover with a large top and a small bottom, and required that the manhole cover casting must be accurate to the millimeter. In this way, the manhole cover and the road surface can be fitted seamlessly, which not only eliminates noise, but also increases the difficulty of stealing the manhole cover.

Security issues. In 2010, a sudden rainstorm in Kochi Prefecture, Japan, caused some sewer manhole covers to fall off or break, causing many pedestrians to fall down the sewer. Japan's Ministry of Homeland Security immediately convened experts and local ** to set up a "Manhole Cover Emergency Safety Countermeasures Committee" to conduct on-the-spot investigations of the sewer site where the problem occurred.

The investigation found 8 types of manhole cover safety problems that need to be solved, and formulated the corresponding "emergency safety measures for launching manhole covers" in accordance with the principle of "locking the dangerous area, delineating the danger level, and completely eliminating the potential safety hazards according to the danger level and existing capacity". Specifically, it includes replacing the decompression type anti-fall manhole cover, setting up cameras to monitor the status of the manhole cover, setting up ladders in the sewer to escape from the danger of falling pedestrians, and establishing a manhole cover information and damage monitoring system.

Water: Domestic water pipeline inspection wells.

Waste: special pipeline inspection wells for industrial wastewater;

Electricity: underground cable line inspection well;

Pollution: inspection wells for domestic sewage and other urban sewage pipelines;

Rain: special pipe inspection wells for rainwater drainage.