The trip to Chencang can be said to be a success. It was only the afternoon when we got on the train and started to turn around. According to this time, everyone can return to Chang'an City when the sun sets.
This was something I never dared to think about before. In just one day, could Li Shimin leave the palace and go to another city three hundred miles away to attend a meeting and then return to Chang'an?
It can be said that on the way back, everyone was in an excited mood, including these ministers. They were all thinking about using the railway to do new things.
"Hey, that's not right." Li Shimin said suddenly.
"Dad, what's wrong?" Since they were not discussing a problem at the moment, Li Shimin was naturally replaced by Queen Changsun and the others, while the ministers went to the other half of the carriage.
"The success of the railway construction is not a good thing for me." Li Shimin said.
"Why isn't it a good thing?" Li Ke was stunned. What did his father think of?
"Why isn't it a good thing? Isn't this obvious? Now I can go to a city three hundred miles away to attend a completion ceremony and then return to Chang'an in one day. In the future, the railway will be faster and go to more places. Don't I have Maybe the schedule for the next month or even months has been planned?”
"Is it even possible to arrange a carriage for me to sleep and rest on this train? I can rest at night, wake up during the day and continue working in another place? Is it arranged to go somewhere every day? Anyway, the train will be fast then, so I can go there There are many places, and it’s too late?” Li Shimin asked, squinting his eyes.
Li Ke: "..."
He was stunned for a moment, because he suddenly thought of the leaders of later generations... Ahem... Even if you are in your seventies and want to work as 996, you must do the work of 007... It seems that this is indeed the case?
"Well, of course it's impossible. Dad, what are you thinking about? It's so easy for you to travel anywhere. The guards must follow you." Li Ke coughed quickly and said.
"Really? There are at least a dozen trains, and half of the carriages are enough to carry guards." Li Shimin looked at Li Ke and asked.
"Erlang, if you say this and let Duke Zheng hear it, won't you be impeached for not wanting to make progress?" Empress Changsun came to Li Ke's rescue.
"Yes, that's right. Besides, Dad, this is a good thing. Think about it, you have been working diligently and thriftily in the palace. Although both the Tai Chi Palace and the Daming Palace are well built, any scenery can't be seen. It will just be like that after a long time.”
"But it will be different if you work on the train. Think about it, you will have different scenery to see when you wake up, and you can also go to various places to see new scenery in person. It is all about work, and now you can still do it every day It's a good thing to see something different." Li Ke quickly began to quibble.
"Is that so?" Li Shimin narrowed his eyes and looked at him.
"Of course, I suddenly remembered some knowledge about bridges. I'll go and talk to Yan Shangshu and Duan Shangshu." Li Ke stood up.
"Wait a minute, I think you just want to trick me. Do you think your father and I are not tired enough?" Li Shimin stared at him and said.
"No, dad, you're overthinking it. I really just had an idea and suddenly had a new idea. I'll go and talk to them." Li Ke said quickly.
"Come on, let's go together. I want to hear what you have to say. If you can't say anything new, just wait..." Li Shimin also stood up.
Li Ke: "..."
Now that things have come to this, what else can be said? Li Ke could only stand up silently and walked towards Duan Lun and Yan Lide, who happened to be communicating with each other.
After all, there will definitely be many areas for cooperation between the Ministry of Industry and the Ministry of Construction in the future.
Seeing Li Shimin and Li Ke approaching, they naturally stood up and greeted Li Ke and the others, but they were somewhat confused. They didn't know what His Highness and His Majesty were doing. Didn't they just talk about everything they should have talked about?
"Well, Li Ke said that he would like to discuss some matters related to bridges with you. I am also very interested and come to listen." Li Shimin nodded lightly.
Li Ke; "..."
Dad, aren't you forcing me?
"Your Highness, please speak." Duan Lun and Yan Lide did not take it seriously, but said seriously.
As they came over, the historian next to them naturally came over and sat next to them, listening silently.
"It's like this. I mainly have some ideas about how to build bridges. You all should record them. After you go back, you can find someone to make them out of wood and test them." Li Ke said quickly.
"The simplest, and most common, is the beam bridge, which is the bridge construction method we used on the Weihe River Bridge. Two piers and one bridge. If it is made of steel, the single span can reach about 120 meters. This continuous girder bridge has been the main bridge construction method for a period of time, and will also be the most used bridge method in the future." Li Ke said seriously.
Duan Lun and Yan Lide immediately started recording.
“But this kind of bridge has a fatal weakness, that is, its span is limited by structural problems, and the length cannot be too long. In the future, if we want to cross a large cliff and deep valley at once, such a structure is obviously not enough. ."
"And according to mechanical principles, if the span is too long, steel structure bridges can only be used, but the cost of steel structures is too high. Currently, the engineering department is studying a new structural method, prestressed concrete technology."
"It is to embed pre-stretched steel bars in the concrete and use the tensile strength of the steel to balance the external forces on the bridge. In this way, its cost can be reduced to a lower level and it can also withstand higher loads."
"Prestressed? Your Highness really has a wonderful idea, and he can come up with such a technology." Yan Lide's eyes lit up and he couldn't help but praise.
As the original general and master of the Tang Dynasty, Yan Lide was naturally one of the first to learn and come into contact with new physics and mathematics, because he had a basic foundation and had learned the study of things before, but he just used new terms to expand his previous knowledge. statistics.
So naturally I learned very quickly.
"Wait, can that steel be stretched?" Li Shimin couldn't help but ask, because in his opinion, shouldn't steel be very hard?
"Yes, Your Majesty, in fact, everything in the world has a certain ability to deform. For example, dry wood will not bend within a certain length."
"But when the length of this piece of wood continues to stretch, it will then appear slightly curved. The same is true for steel. Although I have never seen it, I think that if the length of steel is one or two hundred meters, it may look like The noodles are as soft as noodles." Yan Lide had average emotional intelligence and immediately explained it to Li Shimin.
"Oh?" Li Shimin actually didn't understand, but he nodded seriously and motioned for Li Ke to continue.
