Why is the cover of the sewer pipe round?

Because the round lid does not easily fall underneath.

If you think about it, if it's a square lid, its diagonal is much longer than the side length, so if the lid is crooked, it's easy to fall into the well!

I understand.

Not all are round, square, rectangular, you see on the road, because the circle is the most uniform, can evenly transmit the dynamic load to the ground, the roadside rainwater well is not round, because there is no dynamic load, if designed as a circle will occupy the road resources, the national standard atlas actually has a lot of shapes.

The round ones are made to prevent someone from stealing.

I once watched a science and education film in which the prisoner would pull the square lid down diagonally and run away. Come back later to pick it up.

According to the hydrodynamic point of view, a round container can withstand pressure more than other shaped containers.

And save materials.

The round manhole cover can't fall into the well no matter how you turn it over, and the other shapes are very unsafe!

If someone wants to go down to the bottom, the round ones are easier to turn over, but the square ones can't.

Because the area of the circle is the largest in the plane figure, it is easier to get into the water, mainly because it is fast

Doesn't it mean that because the sewer outlet is round, the round lid is used?

First, the manhole itself is round, because the round one is easy to dig, so the cover is not round; Second, the lid of the rectangle or other polygons will fall from the diagonal, and it will be difficult to fish it up;

Thirdly, such a heavy cast iron guy, only the round one can push and roll;

Fourth, it is estimated that making a five-pointed star-shaped mold is much more troublesome than making a round ancient winter;

As for the cost saving and safety considerations, I guess he didn't think it was so complicated when he designed it, in fact, the main reason should be because the manhole itself is round, and nothing else is important.

Finally, I want to note that there are really square manhole covers, but they are not very commonly used.

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.

Circle and triangle ratio material saving! And it's inconvenient for the triangle people to go down!

1.The hole under the lid is round, as the cylindrical shape best withstands the pressure of the surrounding land. Moreover, sewer access holes meant that there was enough space for one person to pass through, and the cross-section of a person climbing down a ladder was basically round.

So the round shape naturally becomes the shape of the sewer access hole. The round manhole cover is only to cover the circular opening.

2.Regarding the problem of the manhole cover circle, it can be traced back to France in the 13th century, when France was building Paris, considering the problem of building sewers, some people proposed to rebuild the cellar as a sewer, because the French winemaking was every household at that time, almost every family had a winemaking cellar, because there was a round hole in the ground for transporting the cellar of winemaking oak barrels, in order to avoid danger, these caves used round discus as manhole covers. Until the Roman Empire used French sewer technology in the construction of the city of Rome, major cities around the world used Roman sewer technology.

3.In fact, sewer covers are also square and rectangular.

4.Because the sewer is round, the manhole cover must be round.

1. Because no matter how the circle turns, it is round, and it will not fall down because of which side is narrower, 2. It is easy to transport and can be rolled, 3. It saves materials, the same large area, and uses less material, 4. The sewer mouth causes a circle to reduce the probability of irregular objects (bicycles, stones, etc.) falling down after the sewer cover is stolen.

5. The round shape can reduce the possibility of pedestrians falling down due to lookout after the sewer cover is stolen, because the woman is round, the eyes are round, and the sewer mouth is also round, which can reduce the eye fatigue and body fatigue caused by the uneven force of looking at other shaped objects, thereby reducing the possibility of falling into the sewer, in short, there are many benefits.

Because if it's square, rectangular or elliptical, it's easy to fall into the tunnel! But with a round lid, you can avoid this.

Of course, there are the following reasons: the round cover can save materials, increase the area of the hole, and increase the strength of the manhole cover and the well seat is not easy to be broken.

The manhole cover of the sewer, why is it round and not square, after reading the knowledge.