technical type

The so-called arch bridge is actually a flat bridge deck, that is, the bridge deck is still straight, not like an arch. This is a double arch structure, which is spliced ​​with each other to increase stability. The so-called shape is an arch. This is what it means to be a beam.

The lower system is arched, and the upper system is a straight extension of the road surface. From this point of view, all arch bridges can be called flat bridges from the bridge deck.

The opposite is the sloping bridge deck. Pedestrians going up and down the bridge are like climbing a slope. There is a slope, which inevitably makes them feel a little difficult.

But its benefits are more intuitive. First, the height in the middle of the arch is enough to meet the passage of the mast of a ship. Second, its span can be further increased, and third, its beauty.

If an arch bridge with a flat deck is called an arch bridge, many people can only look at the bridge hole below and interpret the arched "arch" with that radian, while a Hongqiao bridge with a slope deck is a complete arch. The crescent moon is turned upside down, just to build a bridge, and it is like a rainbow on that day, setting up the world, and it has just been called Hongqiao.

Compared with the previous ones, its construction difficulty can only be said to be more sophisticated.

Master Ji has also used models to teach these years. Before he taught Ji Mo, he mostly used his hands to make gestures. If he was asked to draw with a brush, it was really the key to inaccurate drawings.

how to say?These craftsmen with little literary talent are confident in the skills they have mastered, but if this confidence is displayed in a way that is not shown in the skills, such as words and pictures, their self-confidence becomes inferiority complex , like a child who doesn't know how to use a pen, sees an adult writing, only envious eyes, but he dare not grab a pen immediately.

When Master Ji used to learn, he used gestures and practice, and now when he is teaching, it is the same. However, Ji Mo can make models and give him an auxiliary teaching tool.

"The Hongqiao is still two sets of arches, which function up and down..."

Master Ji explained the key points, and some of them are the experiences passed down from his ancestors. He has never built a Hongqiao himself, or built a real Hongqiao.

There are not many rivers that can build Hongqiao, and it must have a span value. If it is less than this value, it will only be an enlarged model. It will not be a problem if you don’t use this structure. This structure also does not show the kind of level.

When Master Ji saw Lie Xinxi when he was young, he thought about recreating all the types of bridges built by his ancestors, but later, after building too many bridges, he gradually stopped thinking about it. It is easy to change, some types of bridges are not suitable after all, and secondly, it is suitable for local conditions. There are always some places that are suitable for such a simple bridge. There will be more reputation assistance, but it has become a drag.

But this idea is still there after all. Think about it, all the bridges you have heard of can be built, which in itself is a sense of accomplishment.

It is inevitable that you will feel excited when you say it.

Master Ji's face was flushed, and while suppressing a certain agitation, he told Ji Mo the characteristics of Hongqiao in a deep voice.

If it’s just a double arch, it’s unavoidable that there are deficiencies. Because of the large span, it lacks rigidity. This kind of rigidity means that walking on the bridge deck will not feel the bridge swaying from side to side. If it blows over there, the bamboo pole will fall over there, wobbly and completely rootless.

Therefore, cross-bars are installed on the vertical end of the abutment. The cross-bars are the endpoints connected by straight lines. Their existence makes the bridge deck more stable and prevents it from shaking from side to side.Furthermore, braces should be added at the bottom of the bridge to prevent it from swinging back and forth.

This is the idea of ​​a wooden arch bridge. In general, the weight depends on the density, specific gravity, and texture of the wood, so you need to pay more attention to the selection of materials.

And if you choose stone, the weight must be one layer heavier. At the same time, the force structure of the arch coupon is not simply one plus one equals two, and the calculation complexity is even more difficult because there is no suitable formula. Mo can only ponder and apply it based on Master Ji's experience and the level of elementary mechanics he has learned in modern times. He can also sum up some more scientific experience, but in the end the amount of calculation is still It is not rigorous enough, so while repeated calculations are required, it is also necessary to consider whether the scaled-down model can be successfully used as a demonstration.

Every time after the demonstration was completed, Ji Mo was sweating profusely. That kind of extreme concentration, and the feeling of knowing that there are tigers in the mountain and preferring to go to the mountain, made him almost fearful of difficulties.

Bridge-building, which seems to be a technical thing, is actually too deeply entangled with mechanics and mathematics. Most of Master Ji's algorithms rely on experience and feeling. He doesn't have that experience and feeling. Lacking the support of various modern mechanical theories and calculation formulas, it is simply too difficult to prove why one plus one equals two by oneself.

"With this skill alone, you can swim shrimp at a shallow level, and dive into a dragon at a deep level. It's too difficult."

Ji Mo lays on the bed every day and reflects on what he has gained. He always wants to add a liberal arts option to the system, and directly screen out those parts that are too deeply entangled with science. He smiles wryly, he is really not that kind of talent!

However, facing up to difficulties is a daily necessity. In this painful and joyful study, Ji Mo finally ushered in the dawn and was about to build a bridge again.

With the success of the previous round, this time, Master Ji can let him do it freely. With his reputation as a guarantee, the company that hired the man-made bridge did not despise Ji Mo, and entertained him with delicious food and drink, just waiting Build a bridge for them here.

This is a small town, the river is not wide, the river is not urgent, as far as the eye can see, there is already a bridge, and it is still in normal use.

Ji Mo almost thought he had found the wrong place, but only after asking did he find out that this was a contest of good deeds.

There are talented people in the small town, so they want to benefit the village, but what is the village lacking?It can be used as a card, but he is not worthy, so it is inevitable to build bridges and pave roads, but there are also bridges and roads, and if you do other things, it seems that there is no such meaning. Then, one bridge is not enough to go, and another one, why? Sample?

"No hindrance, no hindrance, one on this end, one on the other end, the two bridges correspond to each other, it's pretty good!"

The old man who paid the money has not gotten fat yet, his financial resources are limited, and he does not spend a lot of money. He privately agreed on the style of the bridge. It is beautiful to save money. Of course, it is also necessary to be durable, but this is the most basic requirements need not be elaborated.

Ji Mo felt a little helpless in his heart, okay, it's the uncle who paid the money.

The previous small bridge was made of wooden arches, and it has been around for a long time. This kind of bridge that is not under the scope of the government is rarely repaired, and it looks quite old. Fortunately, even though there is a little noise when walking, it is still solid. This is the bridge deck. Some are uneven.

"This should be the bridge built by Master Wang."

Wang Shizhu talked to Ji Mo in private.

There is also a lot of competition among bridge builders. It seems that there will be no shortage of places to build bridges in the world, but there are not many people who are really capable of spending money to build bridges, so the competition between them is still very fierce. At least this king Master and Master Ji are not very good at it.

Ji Mo has met some other people in recent years. Even if they are in the same industry, there are differences in each other's skills. What can be built, I can also build, the details may be poor, the appearance is not bad, if you have the heart, you can always find out, there is nothing to say.” Therefore, there is little communication between bridge builders, the core technology You can't tell others for nothing, but why tell those who can tell that the bridge is there, it's all on the surface, and you can't see it, so you are still a bridge builder.

If you take a closer look, the truth is no problem. If you don’t say anything else, just say that the seemingly complicated double arch structure is half above the bridge deck and half below the bridge deck. The wooden arch is erected. I don’t understand it once. Read it several times, don't you understand?

Maybe the first attempt will fail, but if you try a few more times, can't you succeed?

Family inheritance may be precious, but those who can find out by themselves and learn skills in practice are considered capable.

Master Wang is such a capable person. He was born in Ye Luzi and figured it out by himself. It is not in the same way as Master Ji's family. They belong to two factions, so naturally they cannot eat at the same table.

Not to mention, a bridge builder like them is the leader of a large group of people, and he has never seen two rams get along in harmony, which makes the disciples below feel very embarrassed.

So if Ji Mo hadn't worshiped a good master and directly received careful teaching, it would be really not easy to get ahead by gathering all the bridge builders and then learning from them together. industry differences.

Wang Shizhu laughed as soon as he finished speaking. Ji Mo saw that he was smiling strangely, and after asking again, he realized that Master Wang really had no choice but to build this kind of crooked bridge in the early years. That's right, it was done on purpose when it was rebuilt later.

"I heard him tell people that what he wants for this inclined bridge is to be different."

People, when they get old, they become self-willed. If they don't seek good things, they only seek this kind of characteristic.

Because the inclination of the bridge deck is not serious, it does not affect the use, and the price is cheaper. Many people from all over the world ask him to build bridges, even his disciples, and some of them also maintain this characteristic. , quite tasty.

For these potential competitors, Wang Shizhu, a man of few words, knows a lot and put his heart into it.

Ji Mo was amused to hear that this kind of characteristic bridge is really, quite distinctive.

I walked back and forth on the bridge, and looked under the bridge. It is also a double arch. Master Wang made it a bit clumsy. It seems to have reversed a certain step. If the buns are hidden inside, It looked like a steamed bun from the outside, but it was only after biting open that it was a steamed bun—it had fillings!

"It's quite interesting." Ji Mo knows the structure of the bridge, and only then can he see some color from the outside. If he doesn't know, this kind of thing is quite mysterious.