Why should the lid of the sewer be designed to be round

1. Because it is round, it will not fall into the sewer. If it is square, the length of the diagonal is greater than the length of the side, and there is a risk of falling.

2. Because it is round, it is conducive to the handling of workers.

3. From the point of view of physics, the force of the circle is balanced.

4. From a geometric point of view, the space of the circle is the largest, which is conducive to the workers to work.

This question, when Microsoft was recruiting, it also got this question!

In terms of design, the circle is more beautiful

From the point of view of safety, the circle is relatively light, there are no horns, even if a person kicks it, it will not be too injured If you encounter this exam question when you should look at it, you must not do this, otherwise there will be no creativity The creative answer depends on yourself.

The round shape is subjected to the most pressure.

Sewer pipes are usually buried deep in the ground because they are drained, and they need to withstand considerable pressure.

Square and rectangular pipes for cables and other facilities are generally very shallow from the surface.

It's not all round, some are rectangular. The round ones are mostly the covers of the sewer wells and the covers of some underground facilities. Sewers are generally the kind of hollow fences, or how to go into the water, hehe.

Actually, there are a lot of square lids.

In fact, if you think about not having the lid of all the bottles or containers in your life, most of them are round. It is said that things that are round do not deform easily.

The cover of the sewer is round and square, not all the sewer manhole covers are round, on our side, the southern climate is humid and rainy, in order to facilitate drainage, the sewer cover in many places is a square cover. Of course, the main sewer cover is still mainly round.

Why are round lids so widely used?

The road administration in the urban area basically uses circular sewer manhole covers.

There will be a large number of pedestrians and vehicles passing on the road, and if you use a square manhole cover, the manhole cover is easy to fall after falling into disrepair, and there will be no signs to let passers-by know. Moreover, the gap on the square cover is also prone to accidents.

For example, in the case of the picture below, it is easy to step on the pit if you are not careful.

But the round lid is different, and we all know that the distance from the center of the circle to any edge of the circle is equal.

So even if there is a problem with the manhole cover, as long as it is not broken, it is difficult to fall from the sewer mouth.

Even if it is crushed and shaken by a passing vehicle for a long time and shakes out, it will not fall under the manhole cover again, but has become a special reminder sign to remind passing drivers and pedestrians to pay attention to ......

From the perspective of safety, it is obvious that the round square is more safe and reliable.

Therefore, many sewer manhole covers adopt a circular design.

However, this design is not only from the perspective of safety, but also takes into account the ease of transportation.

In order to ensure the quality of the manhole cover of Xiayuqing Bridge and make it have high compression, bending and impact resistance, it is generally thickness and strength. We can also see that the thickness of the sewer is very thick, generally one is about 70kg.

Imagine that such a heavy manhole cover would be very labor-intensive to unload from the car and then install it on the sewer wellhead.

But if it is round, it has one more advantage than the square one, after moving off the car, you can use the rolling method, "roll to the manhole cover", and then seal and reinforce it.

If you can't move it, get out," ......It has also become the second reason for the popularity of round manhole covers.

The third reason is from the perspective of anti-theft.

Qingmeng has mentioned earlier that the square cover can drain water better, and in order to achieve the drainage function, there will be more gaps, which provide convenience for the person who steals the manhole cover to commit the crime.

It is only necessary to pry up the manhole cover from the gap with an iron rod with a qualified load-bearing, and the cover of the sewer can be taken away from ......

Round, generally there will not be so many gaps, or even only a small leakage hole, it is more difficult to warp the whole manhole cover through one hole.

Due to the gaps in the square cover, it is easy to cause sand, soil, garbage, etc. to fall along the manhole cover to the sewer, resulting in the sewer blockage ......

So, for the above reasons, most of the sewer covers use round covers.

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.