Datang: Li Shimin begged me to rebel

Li Ke is a little speechless, no, dad and we are all like this, you still let me continue?The problem is that Li Ke doesn't dare to refute at this moment. You said that he is about to win the championship. If he is still beaten by his father, wouldn't it be a bit too embarrassing.

"In addition to the traditional girder bridge, there is also a brand new girder bridge, that is, the pier and the girder body are integrated with reinforced concrete. When the girder body and the pier are fixed as a whole, they can jointly bear the resistance of the girder. The bending of the body, the girder bridge of this structure, I call it a rigid frame bridge.”

"With the assistance of bridge piers, it can achieve a higher span, or choose a thinner bridge deck, but it is more sensitive to thermal expansion and contraction, but it can be set up in high mountains and valleys by setting higher bridge piers, which can make it become become more flexible, thereby releasing the deformation of the beam body.”

"This kind of pier can be built up to a height of 200 meters, or even close to 300 meters! The maximum span can also exceed [-] meters! It is most suitable for high mountains and valleys." Now that he said it, Li Ke simply started to introduce it.

"However, if the canyon or the river is wider, a bridge with a larger span is needed at this time. The second type of bridge is an arch bridge that is good at increasing the span, such as Zhaozhou built in the Sui Dynasty. An arch bridge, Zhaozhou Bridge is a typical arch bridge. Its span has reached as much as 37 meters."

"Arch bridges can be divided into upward-connected arch bridges after design, which is the type of Zhaozhou Bridge. There are also intermediate-connected arch bridges and downward-connected arch bridges."

Li Ke took the pen and paper next to him and drew a rough figure for Yan Lide.

"The arch bridge does not need to be in the form of Zhaozhou Bridge, but a truss arch bridge can be used for a larger span." Li Ke said while drawing on white paper with a pen.

The historians over there simply gathered together and recorded it after reading it.

"There are still many ways to strengthen the structure of the arch bridge. For example, the steel pipe concrete arch bridge with concrete added to it can be stronger and more reliable than ordinary concrete arch bridges, and the steel pipe can also be used as the construction skeleton of the bridge, which is also more convenient and safe."

"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 arch bridge can reach more than 400 meters."

"In the case of a substantial increase in steel production, if a brand-new steel arch bridge is adopted, combined with structural combinations such as trusses and steel structures, it is not difficult for such an arch bridge to span more than 550 meters."

"There are two types of bridges below, one is a cable-stayed bridge and the other is a suspension bridge. The span of a cable-stayed bridge approaching 1000 meters is no longer a problem."

"Cable-stayed bridges and suspension bridges have actually been used in some mountainous areas, especially suspension bridges, that is, cable bridges or suspension bridges. If our technology passes, after strict calculations, for example, the main steel cable for lifting the bridge deck can use 5 The high-strength steel wires of about 127 mm are used as materials, 352 wires make a bundle, [-] bundles make a cable, and double cables run in parallel.”

"At that time, the bridge deck that can be hoisted will not be a problem if it spans 800 meters. At that time, you can directly cross the Yangtze River and the Yellow River without using the bridge piers and choosing a suitable position!"

"And if the production technology of steel materials can be improved, there will be no problem for this kind of suspension bridge to span 5000 meters by then." Li Ke introduced seriously.

While introducing, he drew the structure and appearance of these bridges with pen and paper.

Li Shimin: "..."

He felt like he was listening to a bible.

A bridge spanning more than 100 meters, Li Shimin felt too shocked, spanning nearly three miles?What kind of myth and legend is this?Not to mention the bridge that ran directly to the length of ten miles, suspended by steel cables alone? !

This... Li Shimin didn't even know how to describe his thoughts.

The problem is...he felt that Li Ke was talking nonsense, but he couldn't refute it if he didn't understand it. The point is that Yan Lide and the others thought it made sense? !And they are all remembering 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 can't." Li Ke said seriously.

"This... can also be calculated?" Yan Lide asked hesitantly.

Li Shimin originally wanted to ask, but Yan Lide helped him to ask, which is very good.

"Of course. For example, the structural strength of steel cables can be calculated. In the absence of steel cables, you can use silk threads to calculate."

"For example, how much force is needed to break the silk thread, set a unit of force, and this unit needs to find some values ​​that cannot be changed as a fixed value, such as the gravity of a kilogram of objects on the surface of the earth. "

"Set a unit of force, measure the tensile force of the wire, and then assemble the bridge structure, calculate the tensile force that the material can withstand, and then replace it with a stronger material, such as the tensile force that steel can withstand, etc. structure."

"As long as the data is known, it's easy to calculate what conditions a bridge spanning several thousand meters needs to meet, isn't it?"

Li Shimin: "..."

How easy is this?

But looking at Yan Lide and the others, they are all thoughtful, it is obvious that this thing is really feasible.

"Work hard. My Tang Dynasty has a vast territory, with rugged mountains and rivers, complemented by rivers and rivers, and many lakes. In order to be more convenient, the roads and railways must be connected by countless bridges."

"When the time comes, the total number of bridges in the entire Tang Dynasty will probably exceed one million."

"So your Ministry of Construction has a major task. If you want to train, you can now train a large number of civil engineering talents in bridges and other fields."

"Isn't the Weihe Bridge under construction now? Let them learn from it. Internships are the best teachers."

"The future bridges of the Tang Dynasty need you to build, and as the first generation minister of the Ministry of Construction who presides over so many bridges and engineering construction, Yan Shangshu will definitely leave an important mark in the history books." Li Ke stretched out his hand and patted Yan Lide's shoulder, poured him a big mouthful of chicken soup by the way.

"Thank you, Your Highness, for your guidance. I understand. After I go back, I will go to Kong Shangshu, ask for more talents from the Imperial Academy and other departments, and train them first." Yan Lide said excitedly.

All right, Li Shimin nodded in satisfaction, then stood up and said, "Okay, good job, it looks like you kid isn't joking with your father."

After leaving a word, Li Shimin disappeared, anyway, his goal was achieved.Look, Li Ke has proposed another job that others cannot do?Don't talk about millions of bridges, just the suspension bridge he said, if it continues to develop, can anyone else besides Li Ke be competent?

With so many bridge engineers trained, he will not have the final say on this major project.

It's all a good thing, do you really think I'm serious with him?This is not a matter of convenience, and the pit is dug.