"What is Professor Qian busy with now?"

Hearing Li Huayong ask about his work, Lao Qian didn't care for a while, considering that the other party was just a "high school student", he simply explained to Li Huayong: "Oh? You ask this, it's like this, we are going to build a bridge in Shencheng, and then organize colleges and universities in the city to jointly tackle some of these technical problems, and we have also undertaken part of the tasks in this laboratory." ”

Speaking of this, Lao Qian paused, and he added to Li Huayong with a smile: "As for the topic of this time, I would like to thank you Xiao Li when it comes to it, because this topic is a bit similar to the problem we solved in the Bank of China Building last time." ”

"Oh, again about the wind resistance of buildings?"

"That's right, it's still the building that resists the wind. ”

A new bridge that Shencheng City is about to build? A joint research project by colleges and universities? Is it related to building wind resistance? Connecting these key words, Li Huayong has almost guessed what kind of project it is.

If he didn't guess wrong, then what Lao Qian is doing now should be the preparatory work for the Shencheng Nanpu Bridge project, known as the "first bridge on the Huangpu River".

In real history, the bridge was completed in the early nineties, and now it is the end of 86, and it will be 87 years soon.

Thinking of this, Li Huayong was not calm, and at this moment, he was even a little excited, and his heart fluctuated. I have encountered a milestone in the history of Chinese engineering!

At this time, Li Huayong even felt that he was quite lucky, and his experience after being reborn was really wonderful.

When he first crossed, he fell on the landmark construction site of "Pengcheng World Trade Center", followed by the Xiangjiang Bank of China Building, as the tallest building in Asia in this era, of course, this is also a milestone, and now he actually let himself meet the Shencheng Nanpu Bridge, a milestone in the history of Chinese bridges.

Our country has been a big bridge country since ancient times, and the total number of bridges built in our country has exceeded one million before Li Huayong crossed. Among so many bridges, the Nanpu Bridge in Shencheng is indeed a milestone. Li Huayong even believes that if the "Zhaozhou Bridge" and other ancient bridges are put aside, only in terms of bridges built in New China, the milestone significance of the Nanpu Bridge can probably rank third.

The first place is the Wuhan Yangtze River Bridge, which is the first Yangtze River bridge built in our country after the founding of New China.

The second place should be regarded as the Nanjing Yangtze River Bridge, the special significance of this bridge is that the Nanjiang Yangtze River Bridge was completely built by our country's self-reliance, and the Wuhan Yangtze River Bridge was built with the help of Soviet experts.

In addition to the two famous bridges in front, Li Huayong believes that the one that is qualified to rank third should be the Nanpu Bridge in Shencheng. The special significance of this bridge, the key lies in its construction technology, if you use the full term of engineering, this is a "cross-river double-tower double-cable-surface superimposed beam structure cable-stayed bridge".

That's right, it is precisely because this is a modern cable-stayed bridge designed and built by our country itself, which makes it qualified to rank third.

Here it is necessary to ask an interesting question about what is called a "modern bridge".

Let's put it this way, if you ask an ordinary person: whether the Nanjing Yangtze River Bridge is considered a "modern bridge", ordinary people may answer loudly and proudly, of course, the Nanjing Yangtze River Bridge is the first modern Yangtze River bridge built by our country.

But what if you ask the same question to a bridge engineer in the new century? Then the engineer may be a little hesitant to answer, and he may say yes in the same way, but he may explain to you further: "The Nanjing Yangtze River Bridge is a modern traditional bridge."

But if you ask this bridge engineer another question, is the Nanpu Bridge in Shencheng a modern bridge? This time, the bridge engineer will not have any hesitation, and he will tell you loudly and proudly like that ordinary person: Of course, the Nanpu Bridge is the first "modern bridge in the true sense" built by our country.

Note the difference, the Nanjing Yangtze River Bridge is a "modern traditional bridge", while the Shencheng Nanpu Bridge is a "modern bridge in the true sense of the word".

It is because of this difference that it qualifies for No. 3.

So what is the difference between "traditional" and "modernized in the real sense"? The key lies in the different construction techniques: the Nanjing Yangtze River Bridge adopts the traditional "pier" bridge method, while the Nanpu Bridge adopts the suspension cable-stayed technology. In modern bridge science, suspension cable-stayed technology is very important, occupies a very prominent position in modern bridges, this technology has even become a symbol, the symbol of modern bridges, and later we only called the "suspension bridge" and "cable-stayed bridge" this type of bridge, only called the modern bridge in the real sense.

Although if you really want to talk about it, this technology is not new, and "suspension bridges" have existed since ancient times. Especially in our country, the title of "infrastructure madness" is not exclusive to China in later generations, and our ancestors also did not promise much in this regard. Especially in terms of bridges, in the past years, our country's bridge-building technology did not know how many years ahead of the world.

We don't need to blow the classic arch bridge technology like "Zhaozhou Bridge", just give a few other examples, so that everyone can see how good our ancestors are.

For example, the well-known "forced crossing of the Dadu River and flying over the Luding Bridge" during the Long March of the "our army" What kind of bridge is this "Luding Bridge"? Of course, it is also a "suspension bridge" in the traditional sense. So when was this bridge built? It was probably built during the Kangxi reign of the Qing Dynasty.

For example, in which country is the world's first sea-crossing bridge? That is the "Luoyang Bridge" in Quanzhou, our country, which was built in the Song Dynasty and can still be used today. In particular, the bridge uses a technique called "planting and solidifying", which means that oysters are grown on the bridge base. Because oysters are very fertile and pervasive, once they are mixed with the stone gum, they cannot be shoveled off with a shovel. This is how our ancestors ensured a solid foundation.

And this kind of application of biological principles to construction engineering is the first in the world, and such a whimsical idea is probably only imagined by us Chinese.

Of course, the glory of our ancestors does not mean our current glory, and our ancestors do not mean that we are awesome at this time. As far as modern bridge technology is concerned, especially in the eighties of the twentieth century, it must be admitted that our country is still relatively backward.

Li Huayong is still the same concept, Chinese architecture is backward in this era, it is by no means backward in concept, the gap is mainly in the mastery of new materials and the application of new technologies.

Take bridge building as an example, our country has not yet been able to build modern "suspension bridges" and "cable-stayed bridges", while Western countries, especially the United States, were able to build similar bridges as early as the 30s.

No, the idea of the modern "suspension bridge" is actually no different from that of the Luding Bridge, and the two are the same ideas and principles. The gap between us and the West in this era is mainly in those real basic technologies.

For example, the steel used to build this bridge, you can fully imagine that the steel bars that need to be used on the cable-stayed bridge are of course not ordinary steel, which requires extremely high tensile strength, and this kind of steel cannot be produced in our country at present, and if the materials cannot be made, then of course there is no way to talk about repairing the bridge. 8)