Why is the manhole cover round? I believe many people have heard this question. A funny answer was "if the manhole cover is square, you will ask why the manhole cover is square. It must have a shape". The following is the reason why I sorted out the well cover is round. Welcome to read and refer to it.
Why is the manhole cover round?
1. First of all, the manhole covers are not all round. In fact, there are also square manhole covers, and there are many. But we are used to seeing the manhole covers on the road, and there are many manhole covers on the road.
2. The fundamental starting point of the shape of the well cover is the shape of the well. Because the well is round, the well cover is round.
3. If it is a rainwater well (excluding the water grate, the water grate is the one with a slit, which can let the water flow in and out of the well cover, square) or an artesian sewage pipe well, they are round, because the round well can receive transverse pipes in any direction.
4. For round wells of the same size, considering the stress strength and other problems, making a round well cover saves the most cost.
5. There are other factors, such as the good handling of the circle and so on.
Folk saying
Someone replied: because there is a Chinese saying called the sky is round, so for the sewer, the well cover is the sky and the sky is round. In fact, this statement is more abstract, but it is not unreasonable. Others say that the manhole cover is round because it is round no matter how the manhole cover rotates, so it will not fall easily because the other side is narrower. Others say that if the manhole cover is round, it is for the convenience of transportation and rolling, but it saves a lot of effort. Using a circle can help us save materials. With the same large area, we can use less materials.
At the same time, if the sewer opening is made into a circle, it is easier to reduce the probability of irregular objects such as bicycles and stones falling down after the sewer cover is stolen. In fact, the circle can really reduce the possibility of pedestrians falling down accidentally after the sewer cover is stolen, and can reduce the probability of danger.
There is also an interesting saying, which means that because women's eyes are round and the sewer mouth is also round, it can reduce the eye fatigue and physical fatigue caused by uneven stress due to looking at other objects, which can also help us reduce the possibility of falling into the sewer. In short, whether the manhole cover is round or beneficial is a more correct design, because if it is square, Or oval, so it's easy for us to fall into the underpass. The round well cover can reduce this kind of thing. In fact, the most unique thing is that people of science and technology say that other shapes, such as triangular manhole covers, are indeed easier to fall than circular ones from a physical point of view.