Li Ke was a little speechless, no, we are already like this, why do you still let me continue? The problem is that Li Ke doesn't dare to refute now. You said that he is about to reach the crown. If he is beaten by his father, wouldn't it be a bit embarrassing?
"In addition to traditional beam bridges, there is also a brand-new beam bridge, which uses reinforced concrete to integrate the piers and beams. When the beams and piers are fixed as a whole, they can jointly bear the resistance of the beam. The bending of the body, this structure of the beam bridge, I call it a rigid frame bridge."
"With the help of bridge piers, it can reach a higher span, or choose a thinner bridge deck, but it is more sensitive to thermal expansion and contraction, but it can be made more flexible by setting higher piers in mountains and valleys. It becomes softer, thereby releasing the deformation of the beam body.”
"This kind of bridge pier can be built to a height of 100 meters, or even close to 200 meters! The maximum span can also exceed 300 meters! It is most suitable for mountains and canyons." Now that he had said it, Li Ke simply started to introduce it. .
"But if the canyons and rivers are wider, then a bridge with a larger span is needed. The second type of bridge is an arch bridge that is good at increasing the span, such as the Zhaozhou built in the Sui Dynasty. Arch bridge, Zhaozhou Bridge is a typical arch bridge. Its span also reaches as much as 37 meters."
"After design, arch bridges can be divided into upper-supporting arch bridges, which is the type of Zhaozhou Bridge. There are also middle-supporting arch bridges and lower-supporting arch bridges."
Li Ke took the pen and paper next to him and drew a rough diagram for Yan Lide.
"The arch bridge does not need to be in the form of Zhaozhou Bridge. In order to have a larger span, it can be an arch bridge with trusses." Li Ke said while drawing on white paper with a pen.
The historians over there simply came over and recorded it after reading it.
"There are many ways to strengthen the structure of arch bridges. For example, concrete-filled steel tube arch bridges that add concrete to steel pipes can be stronger and more reliable than ordinary concrete arch bridges. Moreover, steel pipes can also be used as the construction skeleton of bridges, making them more convenient and safer."
"In addition, a layer of concrete structure can be placed on the outside of the steel pipe. This is called a rigid skeleton arch bridge. The span of this kind of arch bridge can reach more than 400 meters."
"With the substantial increase in steel production, if a brand-new steel arch bridge is used, combined with trusses, steel structures and other structural combinations, it will not be difficult for such an arch bridge to have a span of more than 550 meters."
"There are two types of bridges below, one is a cable-stayed bridge and the other is a suspension bridge. It is no longer a problem for cable-stayed bridges to span nearly a thousand meters."
"There are actually cases of cable-stayed bridges and suspension bridges in some mountainous areas, especially suspension bridges, that is, cable bridges or suspension bridges. If our technology passes the test and strict calculations are done, for example, the main steel cables used to lift the bridge deck can be 5 High-strength steel wires of about millimeters are used as materials, 127 wires are a bundle, 352 bundles are a cable, and the two cables are parallel."
"At that time, the bridge deck that can be hoisted will not be a problem if it spans 1,700 to 800 meters. At that time, we can directly cross the Yangtze and Yellow Rivers without using piers and choose a suitable location!"
"And if the production technology of steel materials can be improved, there will be no problem for this kind of suspension bridge to span 5,000 meters." Li Ke introduced seriously.
While introducing them, he drew the structure and appearance of these bridges with pen and paper.
Li Shimin: "..."
He felt like he was listening to a book from heaven.
Li Shimin felt shocked that a bridge spanned more than 100 meters. It spanned nearly three miles? What kind of myth is this? Not to mention a bridge that is ten miles in length, hanging by steel cables alone? !
This... Li Shimin didn't even know how to describe his thoughts.
The problem is... he thinks Li Ke is talking nonsense, but since he doesn't understand, he can't refute it. The point is, Yan Lide and the others actually think it makes sense? ! And are you remembering it very seriously? Could it be true? !
"If you are interested, you can calculate all these data after you go back. Everything in this world can deceive people, but mathematics cannot." Li Ke said seriously.
"Can this... also be calculated?" Yan Lide hesitated and asked.
Li Shimin originally wanted to ask, but Yan Lide asked it for him, which was good.
"Of course. For example, the structural strength of steel cables can be calculated. If there are no steel cables, you can use silk threads to calculate it."
"For example, how much force is required to pull a silk thread? Set a unit of force, and this unit needs to find some value that cannot be changed as a fixed value, such as the gravity of a one kilogram object on the surface of the earth. "
"Set a unit of force, measure the tension of the wire, and then assemble the bridge structure, calculate the tension that the material can withstand, and then replace it with a stronger material, such as the tension that steel can withstand, etc. structure."
"As long as these data are known, it is very simple to calculate what conditions a bridge spanning thousands of meters needs to meet, isn't it?"
Li Shimin: "..."
How is this simple?
But seeing Yan Lide and the others looking thoughtful, it was obvious that this thing was really feasible.
"Work hard. Our Datang territory is vast, with rugged mountains and rivers, a network of rivers, and numerous lakes. In order to make it more convenient, countless bridges will definitely be needed to connect the roads and railways."
"By then, the total number of bridges in Datang will probably exceed one million."
"So your Ministry of Construction has an important task. If you want to train it, you can now train a large number of civil engineering talents in bridges and other fields."
"Isn't the Weihe River Bridge under construction now? They can learn from it. Internships are the best teachers."
"You will need to build all the future bridges in the Tang Dynasty. As the first-generation Minister of Construction who presided over the construction of so many bridges and projects, Shangshu Yan will definitely leave an important mark in the history books." Li Ke stretched out his hand and patted it. Yan Lide's shoulder, while giving him a large mouthful of chicken soup.
"Thank you for the advice, Your Highness. I understand. After I return, I will go to Kong Shangshu and ask for more talents from the Imperial College and other departments to train them first." Yan Lide said excitedly.
Okay, Li Shimin nodded with satisfaction, then stood up and said, "Okay, good job. It seems like you are not joking with your father."
Without saying a word, Li Shimin ran away. Anyway, his goal was achieved. Look, isn't Li Ke proposing another job that no one else is capable of? Not to mention millions of bridges, just the suspension bridges he mentioned. If it continues to develop, can anyone else except Li Ke be qualified?
With so many bridge engineers trained, he will not have the final say on this major project.
These are all good things. Do you really think that I am serious about him? This is not something that can be done easily, and the pit will be dug as soon as it is dug.
