How to identify a sewer manhole cover?

There are two types of municipal drainage manhole covers:

One is a round manhole cover, which is divided into a rainwater inspection well and a sewage inspection well, and the manhole cover is marked with the words "rainwater" and "sewage". Most of the "rainwater" manholes are installed on motorized lanes, and most of the "sewage" manholes are installed on non-motorized lanes or sidewalks.

The other is a square manhole cover, which is generally set next to the road curb and is a rainwater inlet well. The inlet well is a structure where surface water enters the rainwater branch pipe, and its function is to remove surface water from the road surface.

Other manhole cover classifications:

1. Cable manhole cover. It is generally set on the sidewalk, and the manhole cover is generally marked with the logo of the respective company, such as "China Telecom", "China Mobile", "China Unicom" and "Public Security".

2. Power supply manhole cover. Most of the manhole covers are rectangular and are generally set on the sidewalk, and the manhole covers are marked with the words "power supply" or "electricity".

3. Tap water manhole cover. Most of the water wells are circular wells, which are generally installed on the sidewalk. The manhole cover is generally marked with the words "water supply", and there are pipes and valves in the well.

The sign on the sewer manhole cover is the word "dirty", while the sign on the rainwater manhole cover is the word "rain".

Sewer manhole covers are mainly for the discharge of sewage, while rainwater manhole covers are mainly for the discharge of rainwater. Rainwater manhole covers, also known as rainwater grates, are generally cast iron and have relatively high load-bearing requirements. Like the rainwater grate of Hunan Luwen, there are many load-bearing models, so that different sizes can adapt to different areas, and it is convenient to deal with stagnant water.

Rainwater manhole covers are generally installed at intervals alone, and sewer manhole covers are installed on the road surface in the form of a long section.

There are only two differences between rainwater wells, sewage wells, and water supply wells, which are: different references and different uses.

First, the reference is different.

1. Rainwater well: It discharges cleaner water such as rainwater.

2. Sewage well: It is a sewer well for urban sewage discharge and discharge.

3. Water supply well: tap water well, equipped with valves and water meters.

Second, the use is different.

1. Rainwater well: there are holes on the side to connect with the drainage pipe, and there is a seepage pipe extending downward at the bottom, which can replenish the rainwater to the ground and discharge the excess rainwater through the drainage pipe.

2. Sewage well: The sewage well plays a role in eliminating the sewage containing various impurities, dirt and mixed components in the city.

3. Water supply wells: wellboreholes that provide domestic water, industrial water and farmland irrigation for extracting groundwater.

Under normal circumstances, there is a word "dirt" on the sewer manhole cover and a "rain" word on the rainwater manhole cover.

The manhole cover of the sewer and the manhole cover of the sewer are all of that kind of guardrail type. And that rain manhole cover is all kind of round.

It must be separated, and the sewage needs to be discharged after final treatment, and the rainwater can be discharged directly into the river without polluting the environment and water sources.

Look at the total use in **, the standard is not the same.

There is no difference, just the words written are different.

The reason why the lid of the sewer is round:

1. The wellhead can be directly covered from any angle. The square must be adjusted to the same angle as the wellhead;

2. The diameter of the circle is only one, so the circular manhole cover will not fall into the wellhead if it rotates arbitrarily on the wellhead. The square manhole cover, whether it is the side length of the square or the length or width of the rectangle, is bound to be less than the length of the diagonal, if the square manhole cover stands on the side of the wellhead, it is easy to fall into the wellhead;

3. The round shape can be rolled for easy transportation.

1. The round manhole cover can be rolled for easy handling.

2. Easy to install, no need to deliberately adjust the angle during installation.

3. The round manhole cover will not fall into the well because of the different placement methods because the diameter is the same.

4. The circle is the largest figure in the plane figure with the same circumference. Making the manhole cover round can save costs.

5. From the perspective of mechanics, the circular force is relatively uniform, there is no relative stress concentration area, and it is not easy to be damaged.

6. The round shape can be better mated into the ground. So as not to leave edges and corners to hurt people.