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The latest website: For a big river like the Yangtze River, it is extremely difficult to build a bridge on it.

Not to mention that for the contemporary Tang Empire, even for the 21st century of later generations, to build a bridge over such a large river is extremely difficult and requires huge costs.

This is also why the Tang Empire has long considered building a bridge over the Yangtze River, but it has never been done, because the technical difficulty is too great and the cost is too high.

Around the 30th year of Xuanping, the Empire considered building a Yangtze River Bridge in Jinling and Hanyang respectively. The main purpose of the local area was to connect the railways on both sides of the strait.

But because of technical problems, it has not been possible.

Because even the Yangtze River Bridge determined by the predetermined site in Hanyang will have a length of more than 16,000 meters, and if the approach bridges are added, the total length will be even greater.

As for the Jinling side, the Yangtze River is wider, the initial design length has reached more than 4,000 meters, and the deeper the water, the more difficult the construction.

At the same time, the navigation situation of the Yangtze River must also be considered. Just like the Huangpu River, the navigation situation must be considered first when building bridges, and with the development of time, the demand for navigation will be higher.

In the early years, when the Datang Empire planned to build a bridge on the Huangpu River, it was enough to say that it would meet the navigability of ships of 5,000 tons, but then the standard became higher and higher, and 5,000 tons became 10,000 tons. to fifteen thousand tons.

Later, when the Ministry of Industry of the Tang Dynasty and Songjiang Prefecture listened to the experts from the Department of Architecture of the Royal Institute of Technology, when they said that they could build a steel suspension bridge, they simply didn't hold back the tangle of 810,000 tons. , directly came to a water surface height of 35 meters, and this height can definitely meet the navigation of most types of ships now and in the future.

The construction of bridges on the Huangpu River needs to consider navigation, and the construction of bridges on the Yangtze River needs to consider this even more.

Because the Yangtze River shipping is the main artery of the inland shipping of the empire at present, it undertakes most of the transportation tasks of the inland shipping of the Tang Empire, especially the middle and lower reaches of the Yangtze River. The tonnage is also huge.

Generally speaking, although most of the ships currently sailing in the middle and lower reaches of the Yangtze River are inland river vessels of only a few hundred tons, one or two thousand tons, there is no shortage of ships of several thousand tons or even tens of thousands of tons.

In summer, there are often 10,000-ton freighters going up the river, heading straight for the Dangtu Industrial Zone.

At the same time, it must be taken into account that the Datang Empire continues to dredge the rivers of the Yangtze River, and the navigation conditions of its main channel are getting better and better, and it is normal for 10,000-ton freighters to enter the Yangtze River in the future.

Therefore, when building the Yangtze River Bridge, especially in the middle and lower reaches of the Yangtze River Bridge, the navigation of 10,000-ton ships must be satisfied.

But it is not easy to satisfy this.

In fact, if it is not to satisfy the navigation of ships, it is just to build a bridge connecting the two sides of the Yangtze River. In fact, the Datang Empire could have done this for a long time.

Isn't it just a bridge that is several thousand meters long. It is really impossible to directly play the engineering troops. It is possible to erect a pontoon bridge.

But in reality, this cannot be done. If a bridge is built to block the waterway, then shipping on the Yangtze River will be completely abolished.

Due to many circumstances, the construction of the Yangtze River Bridge and even the bridge construction of the Datang Empire on other rivers has stagnated. For a long time, ferries have been used to communicate cross-strait traffic.

For example, the railway ferry in Jinling is famous. Large ferry boats are used to directly transport trains across the river. At the peak, dozens of trains can be transported a day.

However, with the continuous development of industry and commerce in the Datang Empire, the railway transportation has become busier and busier. In order to solve the problem of railway transportation, the Datang Railway Corporation has already begun to construct double-track railways for the single-track railways built in the past. Continue to accelerate.

Now basically the speed of passenger trains can reach 60 kilometers per hour.

However, the existence of rivers such as the Yangtze River limits the further development of railway transportation.

Datang Railway Corporation has long wanted to build a Yangtze River Bridge that can pass trains. Well, not only the Yangtze River Bridge, but also many cross-river bridges such as the Huaihe River, the Yellow River, and the Pearl River.

After the Huangpu River Bridge was successfully completed and opened to traffic, the Datang Railway Corporation could not wait to apply, saying that the technology was mature, and applied for the construction of the Praise Bridge on several rivers such as the Yangtze River and the Yellow River.

The first one is naturally the Jinling Yangtze River Bridge and the Hanyang Yangtze River Bridge.

Because these two places need to connect the railways on both sides of the strait to realize the seamless connection of the railways on both sides of the strait.

After Li Xuan received the report, he did not approve or reject it directly, but forwarded the report to various ministries of the cabinet, especially the Ministry of Industry.

Soon after, the Ministry of Industry convened the Datang Railway Corporation, the Department of Architecture of the Royal Institute of Technology and other related institutions to hold a meeting to discuss the feasibility of building a bridge over the Yangtze River today.

During the meeting, several major professors of the Department of Architecture of the Royal Institute of Technology gave the Datang Railway Corporation and the Ministry of Industry officials a very positive answer, that is, with the current technical conditions, it is already possible to build a cross-river bridge on the Yangtze River , and can ensure that the bridge can still be used for ships of 10,000 tons.

Today, the bridge construction level and experience of the Datang Empire have been fully tempered in the past few decades.

In the past few decades, when the Datang Empire built infrastructure in various places, it was necessary to build bridges, and even several bridges across the Yellow River were built.

Among them, the important railway bridge connecting the Northern Railway, the Zhengzhou Yellow River Bridge, is one of the typical ones.

Moreover, this Zhengzhou Yellow River Bridge was actually built very early. It started construction in Xuanping twenty-five years, and opened to traffic in Xuanping twenty-eight years. It has a total length of more than 3,000 meters.

However, the design of this bridge basically does not consider the navigation of super tonnage ships~www.wuxiaspot.com~ The priority is to give priority to the passage of trains, and there is also an attached bridge for pedestrians and carriages to pass through, so it is built in the way of dense bridge holes. , There are hundreds of bridge holes, and the technology used is also very general.

Of course, even so, this is the longest modern bridge the Tang Empire has built so far.

However, if you want to compare the technical difficulty, it is far inferior to the just completed Huangpu River Bridge.

Not only on the Yellow River, but also in other river sections where large-tonnage ships are not required to be navigable and the geological conditions are good, the Datang Empire has already built a lot of bridges.

Hundreds of meters to thousands of meters in length can be a lot!

However, in the middle and lower reaches of the Yangtze River, there is no bridge for the time being. Now the professors of the Architecture Department of the Royal Institute of Technology say that the technology has matured, so the Datang Empire will naturally not delay.

After confirming the reports of his subordinates, Li Xuan also quickly approved the construction applications for the Hanyang Yangtze River Bridge and the Jinling Yangtze River Bridge.