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The street light pole is so high and so stable, how can it stand
2022-03-03
the beginning of curiosity
I went out for a walk yesterday and wanted to free myself. Walking to a bridge, there are many decorative lights on the bridge, which illuminate the bridge beautifully. It suddenly occurred to me that I recently bought a new LED bulb. I first bought a 12W LED bulb and felt that it was not bright enough, and then I bought a 18W LED bulb, but I still felt it was a little bit worse. I began to think that the decorative lights on this bridge should be 5W. This bridge is so long, alas, a lot of money, a lot of money, and it consumes a lot of electricity. Looking up, there are street lights on the bridge twice. Oh, there are so many street lights. They are also electricity and money. At this time, I noticed that these street light poles are very thin, very high, and straight. Hey? Curiosity surged. How is this game supposed to stand? According to normal thinking, such a tall thin rod will not be blown down by a gust of wind? I walked over and saw that there were screws under each street lamp, which was strange. Just thought, what's under this street light? How can something so tall stand still and not fall down? There is only one way, that is, the pole has to go deep into the ground, and it has to be very deep, in order to stand. Otherwise what is the way?
After various inquiries, it turned out to be the case.
The street light poles themselves do not go deep into the ground. There is a device under them called "embedded parts", also called "ground cages". It's simple as hell.
Of course, it was not strong enough to support the street light, it had to be buried in the concrete. There is actually a large piece of concrete under the street light. This ground cage is what binds the street light to the concrete. So if you look at it this way, the street light doesn't fall because the concrete below is solid enough.
It turns out that the concrete is the foundation, and the ground cage is buried in it. After solidification, the street lights are screwed on it with screws. So here comes the question, is concrete so good? Is it that hard? Is it that solid?
Since I have no experience in civil engineering, I have seen concrete mixer trucks that have been turning, and I have also seen mixing sand or something. Is it cement? I don't know, I'm still curious about it. So let's find out what concrete is.
This is more interesting.
The artifact of concrete
Concrete is also called concrete [tóng]. It has many types. In the simplest human words:
Concrete = Cement + Water + Stone + Sand + Additives
It can be seen that concrete and cement are not the same thing, and cement is just a little brother.
Cement is a chemical product. Its main ingredient is silicate. The raw material is actually a stone containing this ingredient. Heat the stone at high temperature and turn it into ash. Then add some accessories like oil, salt, sauce and vinegar, stir and heat, and then beat it after cooling. Crushed, turned into gray powder, bagged.
The characteristic of this little brother is that when he sees water, he gets excited and goes up to arrest others.
So the cement itself is fine. If stone and sand are also added, it doesn't matter that much and solidifies together. This becomes concrete. Mixed, cemented together, a pile of soil.
Of course, people are very particular about this thing, there is a ratio, and how much hardness is best for something. For example, what kind of pebbles should be added, the ratio of large, medium and small pebbles, then the knowledge is great.
Also, let's talk about additives. Sometimes the stirring is not enough, there are gaps between the stones, and the cement slowly disappears, which causes danger. People invented the "water reducing agent", which can make the cement softer and more fluid. Well, there are fewer bugs. Then, because the cement will solidify for a period of time after encountering water, there is also an additive called "retarder", which makes it slow to solidify, and then I stir it again. How wise.
There is only one last question left, what the hell is that mixer truck, and why should it be turned?
inside the mixer
First of all, it must be turned, because when the concrete is transported, if it is not turned for a long time, the sinking stone will be affected by gravity and fall directly at the bottom, and the water will float on the top. The overall structure is unbalanced, which seriously affects the quality. How did it turn?
It turns out that there are blades in it, and the rotating threads are the same. When you want to put the soil in, turn it clockwise, and to get the soil out, turn it counterclockwise.
I went out for a walk yesterday and wanted to free myself. Walking to a bridge, there are many decorative lights on the bridge, which illuminate the bridge beautifully. It suddenly occurred to me that I recently bought a new LED bulb. I first bought a 12W LED bulb and felt that it was not bright enough, and then I bought a 18W LED bulb, but I still felt it was a little bit worse. I began to think that the decorative lights on this bridge should be 5W. This bridge is so long, alas, a lot of money, a lot of money, and it consumes a lot of electricity. Looking up, there are street lights on the bridge twice. Oh, there are so many street lights. They are also electricity and money. At this time, I noticed that these street light poles are very thin, very high, and straight. Hey? Curiosity surged. How is this game supposed to stand? According to normal thinking, such a tall thin rod will not be blown down by a gust of wind? I walked over and saw that there were screws under each street lamp, which was strange. Just thought, what's under this street light? How can something so tall stand still and not fall down? There is only one way, that is, the pole has to go deep into the ground, and it has to be very deep, in order to stand. Otherwise what is the way?
After various inquiries, it turned out to be the case.
The street light poles themselves do not go deep into the ground. There is a device under them called "embedded parts", also called "ground cages". It's simple as hell.
Of course, it was not strong enough to support the street light, it had to be buried in the concrete. There is actually a large piece of concrete under the street light. This ground cage is what binds the street light to the concrete. So if you look at it this way, the street light doesn't fall because the concrete below is solid enough.
It turns out that the concrete is the foundation, and the ground cage is buried in it. After solidification, the street lights are screwed on it with screws. So here comes the question, is concrete so good? Is it that hard? Is it that solid?
Since I have no experience in civil engineering, I have seen concrete mixer trucks that have been turning, and I have also seen mixing sand or something. Is it cement? I don't know, I'm still curious about it. So let's find out what concrete is.
This is more interesting.
The artifact of concrete
Concrete is also called concrete [tóng]. It has many types. In the simplest human words:
Concrete = Cement + Water + Stone + Sand + Additives
It can be seen that concrete and cement are not the same thing, and cement is just a little brother.
Cement is a chemical product. Its main ingredient is silicate. The raw material is actually a stone containing this ingredient. Heat the stone at high temperature and turn it into ash. Then add some accessories like oil, salt, sauce and vinegar, stir and heat, and then beat it after cooling. Crushed, turned into gray powder, bagged.
The characteristic of this little brother is that when he sees water, he gets excited and goes up to arrest others.
So the cement itself is fine. If stone and sand are also added, it doesn't matter that much and solidifies together. This becomes concrete. Mixed, cemented together, a pile of soil.
Of course, people are very particular about this thing, there is a ratio, and how much hardness is best for something. For example, what kind of pebbles should be added, the ratio of large, medium and small pebbles, then the knowledge is great.
Also, let's talk about additives. Sometimes the stirring is not enough, there are gaps between the stones, and the cement slowly disappears, which causes danger. People invented the "water reducing agent", which can make the cement softer and more fluid. Well, there are fewer bugs. Then, because the cement will solidify for a period of time after encountering water, there is also an additive called "retarder", which makes it slow to solidify, and then I stir it again. How wise.
There is only one last question left, what the hell is that mixer truck, and why should it be turned?
inside the mixer
First of all, it must be turned, because when the concrete is transported, if it is not turned for a long time, the sinking stone will be affected by gravity and fall directly at the bottom, and the water will float on the top. The overall structure is unbalanced, which seriously affects the quality. How did it turn?
It turns out that there are blades in it, and the rotating threads are the same. When you want to put the soil in, turn it clockwise, and to get the soil out, turn it counterclockwise.
After the exploration is completed, a lot of knowledge has been gained.
