Mizukawa opened the window and said, "What do you see?" Grass, trees and poles! So, do you know why telephone poles can stand up?

The six sons of the wind said: My name has numbers, but yours does not. Shouldn't I come first? Absolutely.

The pole's ability to stand up is related to how deep it is buried in the ground. Generally speaking, the deeper the depth, the more stable the pole will be. Of course, it is not possible if all the poles are buried in the ground. Therefore, there is a depth limit here. I think a ratio of three to twenty in the depth of the ground to its own length is the most appropriate.

Margarita was dismissive: depth was naturally related to the stability of the pole, but it was not the main reason. First of all, the pole must be vertical, otherwise it will be useless even if it is deep. And it has to be upright all the time. Although the harder the soil, the harder it is, the harder the surface is, the hardness is really low. In the event of water erosion, dispersion is likely to occur. As a result, the underlying soil is also unstable. Eventually, over the years, the soil at the bottom of the pole can loosen and the pole will fall. To prevent this from happening, the construction crew will make a cylindrical cement column with holes. The construction workers put it in a pre-dug pit and waited for the cement to dry before inserting the pole into the hole. In this way, the stability of the pole can be greatly increased.

Dueñas said: Neither is right. Telephone poles can be erected because of the soil. We know that the soil compactness is different at each location, and the soil compactness of the place where the pole is erected is good, which is naturally a problem for the construction personnel to consider. I think the reason is that the construction crew chose a good location.

Mizukawa said: Not really. Margarita says the pole should be upright, and that's true. However, it is not impossible to stand up if it is tilted. The Leaning Tower of Pisa in Italy is not tilted at a certain angle, but there are so many that it has never been. In fact, the pole cannot reach the vertical level, there is a slight angle of inclination. Of course, this does not affect the stability of the poles.

You think the pit at the bottom of the pole was dug out, but it's not. The construction crew used a large drilling rig. The perimeter of the cylindrical pit drilled by the drilling rig is tight and compact, not at all as loose as we thought. You know the surface tension of water, so do you know that soil also has surface tension? I'm sure you've all seen some popular science videos and know the tremendous ability of water's surface tension. Remember to fill an empty bottle with water and cover the mouth of the bottle with a piece of paper. Then it was turned upside down, and the water actually didn't come out. We all know it's surface tension at work, but how exactly does it work? I feel like it forms a super malleable tensile membrane that stops the water from flowing downward. Because the drilling rig makes the surface of the pit extremely flat, the surface tension increases a lot. The tension forms a membrane. The tension membrane pushes the pole towards the center everywhere, so that the pole is almost vertical. In this case, the pole will not fall.

There are many reasons why the poles are erected, and we have only mentioned one of them.

By the way, I suddenly remembered the well. In rural areas, when digging wells, a ring of stone walls is built around the well. At the end of the day, it's about increasing the stability of the soil.

I don't know if the universe will be destroyed, but I do know that night will appear. At night, it is natural to lie down and rest. However, it is not yet night, and everyone can do what they want to do. Okay, scattered.