Li Ke was a little speechless, no, Dad, we're all like this, you still let me continue? The problem is that Li Ke doesn't dare to refute it at this time, you said that he is going to win the crown, if he is still beaten by his father, is it a bit too embarrassing.

"In addition to the traditional beam bridge, there is also a new kind of beam bridge, that is, the pier and the beam body are integrated with reinforced concrete, when the beam body and the pier are fixed into a whole, they can jointly bear the bending resistance of the beam body, this structure of the beam bridge, I call it a rigid bridge."

"With the assistance of piers, it can reach a higher span, or choose a thinner and lighter deck, but it is more sensitive to thermal expansion and contraction, but it can be made softer by setting higher piers in mountain valleys, thereby releasing the deformation of the beams."

"These piers can be built up to 100 meters or even close to 200 meters high! The maximum span can also exceed 300 meters! Nowhere is it best for mountain valleys. Since he said it, Li Ke simply began to introduce.

"But if the canyon and the river are wider, at this time you need a kind of bridge that crosses a span, and the span should be larger, and the second type of bridge is an arch bridge that is good at increasing the span, such as the Zhaozhou arch bridge built in the Sui Dynasty, and the Zhaozhou bridge is a typical arch bridge. It also spans a whopping 37 meters. ”

"After the design of the arch bridge, it can be divided into the upper bearing arch bridge, that is, the type of Zhaozhou bridge. There are also medium-supported arch bridges, as well as under-supported arch bridges. ”

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

"The arch bridge can not be in the form of Zhaozhou Bridge, and the truss heng arch bridge can be used in order to have a larger span." Li Ke said as he took a pen and drew on the white paper.

The historians over there simply came over and recorded them after reading them.

"There are many ways to strengthen the structure of the arch bridge, such as the concrete tube arch bridge with concrete added to the steel pipe, which can be more solid and reliable than the ordinary concrete arch bridge, and the steel pipe can also be used as the construction skeleton of the bridge, which is also more convenient and safe."

In addition, on the outside of the steel pipe, another layer of concrete structure can be covered, which is called a rigid skeleton arch bridge. The span of such arch bridges can reach more than four hundred meters. ”

"In the case of a significant increase in steel production, if a new steel arch bridge is adopted, with trusses, steel structures and other structural combinations, it is not difficult for this kind of arch bridge to span more than 550 meters."

"There are also two types of bridges below, one is a cable-stayed bridge and the other is a suspension bridge. Cable-stayed bridges are no longer a problem to span nearly a kilometer. ”

"Cable-stayed bridges and suspension bridges in some mountainous areas have already had cases, especially suspension bridges, that is, rope bridges or suspension bridges, if our technology passes, after strict calculations, for example, the main steel cable of the bridge deck can be hoisted using about 5 mm of high-strength steel wire as the material, 127 for a bundle, 352 bundles for a cable, double cables in parallel."

"At that time, the bridge deck that can be lifted will not be a problem to span 17,800 meters. When the time comes, you can directly skip the bridge piers, choose the right location, and directly cross the Yangtze River and the Yellow River! ”

"And if the production technology of steel materials can be improved, there will be no problem with this suspension bridge spanning 5,000 meters." Li Ke said seriously.

As he introduced, 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.

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

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

The question is...... He felt that Li Ke was talking nonsense, but he couldn't understand it, so he couldn't refute it, the point was that Yan Lide and they actually thought it was very reasonable?! And are you remembering it very seriously? Could it be true?!

"If you're interested, you can calculate it all when you go back. Everything in this world can deceive people, but mathematics cannot. Li Ke said seriously.

"This ...... Can it also be calculated? Yan Lide hesitated and asked.

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

"Of course you can, for example, the structural strength of the steel cable can be calculated, and 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 should find some value that cannot be changed as a fixed value, such as what is the gravitational force of a kilogram of objects on the earth's surface."

"Set a unit of force, calculate the tensile force of the silk thread, and then assemble the bridge structure, calculate the tensile force that the material can bear, and then replace it with a stronger material, such as the tensile force that steel can bear."

"As long as the data is known, it's easy to calculate what kind of conditions need to be met for a bridge spanning several kilometers, isn't it?"

Li Shimin: "......"

Where's the simplicity of this?

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

"Work hard, my Datang territory is vast, the mountains and rivers are rugged and horizontal, the rivers and rivers network make up for it, and there are many lakes. At that time, in order to be more convenient, countless bridges will be needed to connect the roads and railways. ”

"When the time comes, the number of bridges in the whole Tang Dynasty will add up, and I am afraid that it will not exceed one million."

"So the task of your Ministry of Construction is very important, if you want to train, you can train a large number of civil engineering professionals in bridges and other fields now."

"Isn't the Weihe Bridge under construction now? You can let them follow along, and internships are the best teachers. ”

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

"Thank you Your Highness for your advice, the minister understands, and when I go back, the minister will go to Kong Shangshu and ask for more talents from Guozijian and other departments, and start cultivating them first." Yan Lide said with some excitement.

Okay, Li Shimin nodded with satisfaction, then stood up and said, "Okay, good job, it looks like your kid is not joking with your father." ”

dropped a sentence, and Li Shimin flashed, anyway, his goal was achieved. You see, didn't Li Ke propose another job that others are not capable of? Not to mention a million bridges, what kind of suspension bridge or something like that he said, continue to develop, and others can do it except Li Ke?

So many bridge engineers have been trained, and when the time comes, he will not have the final say on this major project.

It's all a good thing, do you really think I'm more serious than him? It's not an easy thing to do, and the pit is dug and dug up.