In Hexi County, Hanzhou, three young men were sitting in a temporary room built by the Yellow River and discussing matters.

The young man in the head was wearing a shallow official robe, quite handsome, and was a fifth-rank official. His lower head were two young men wearing dark green official robes. Well, they were all quite handsome, at least much more handsome than Tang Laosi, who was eating dust on the official road.

A combination of fifth-rank and two sixth-rank is an amazing existence in Xiazhou and Hanzhou. You must know that the governor of Hanzhou has only been from the fourth-rank.

What are they doing in groups by the Yellow River? Could it be to investigate hydrology?

However, when examining hydrology, how could officials above the sixth rank come out?

The head of the red robe official said to the green robe official in the lower left: "Brother Du, it's been half a month. Are there any signs of the site selection?"

It seems that it is not really an investigation into hydrology.

The Du Lulu nodded and replied: "Dr. Wang, according to the instructions and requirements of the Shaojiang Letter, three places have been selected, one is the Longmen Ferry, the other is the Yukou two miles away from the Longmen Ferry, and the third place is the Da Longmen twenty miles away from the Longmen Ferry.

Let’s talk about the Longmen Ferry first. Here is only 80 meters wide, and the bridge has the shortest span. However, the mountains on both sides are like cutting like a knife and an axe, which is too dangerous. If a bridge pier is set up here, the construction will be difficult and risky, and the ability to resist geological disasters cannot be estimated.

The second is Yukou, which is the exit of the Longmen with a span of about 150 meters. The water flow here has slowed down a lot, but there is still no way to place bridge piers in the river, which has resulted in only building towers on the shore, with tower spacing of about 140 meters.

The last place is that the Longmen Bridge will be built between Daqian Village and Cangtou Village. The water flow is stable, and the piers can be placed by ship, or a gap can be blocked by intercepting to build the piers. However, the disadvantage here is that the span of the bridge is too long, at least eight miles away, and the investment is too large!"

In the entire Tang Dynasty, there is only one young handsome guy who can be called Wang Dong, and he is Wang Xuance. With the content of the conversation, you can guess with your toes that these three are the handsome guy Wang of Luoyang, cousin Changsun Chong and Du Gou.

After nearly a year of official road construction, Du Gou and Changsun Chong have long transformed from civil service to technical flow.

Otherwise, how could Du Gou make detailed suggestions on the three bridge repair ferries?

In fact, Wang Xuance and the other two pushed the construction of the official road to the edge of the Yellow River two months ago. If it weren't for the natural dangers, I would be afraid that the plan to connect Taiyuan by Tang Laosi was not far from over.

As early as two months ago, Wang Xuance reported the natural obstacles to Tang Heshang by passing a letter from the flying pigeon. When Tang Heshang was in Hanyang, he chose the plan from his mind while copying the design drawings.

Later, it was delayed for more than a month because of Li Gang's death, and then it was delivered to Wang Xuance and the other two.

After Wang Xuance and the other two argued the plan, they spent half a month selecting the site. This was the meeting of today's three giants of road supervision.

After listening to Du Gou's report, Wang Xuance turned his attention to Changsun Chong: "Changsun, you are in charge of safety and technology, so I will share your opinions."

"promise!"

Changsun Chong was not vague and nodded, saying, "From the surveying and mapping results given by Brother Du, these three places are indeed the most suitable for bridge construction."

However, I want to reject the idea of ​​building a bridge directly at the longmen. After all, the erosion of the river water there for many years, no one knows whether the geology beneath it can withstand the weight of the bridge piers. Besides, as Brother Du said, the risk factor for building a bridge there is too high, and it is not easy for our craftsmen to train them, so they cannot take risks.

Secondly, when it comes to Yukou, although the water flow is not that fast, it is much faster than Daqian Village! Therefore, I personally think that building a bridge in Longmen is the best choice, although there is a large span and more investment. However, in terms of safety, it is the most suitable! I asked a villager that the depth of the Yellow River in Daqian Village is not deep, so we can build bridge piers by intercepting the river channel."

After listening to Changsun Chong's idea, Wang Xuance fell into deep thought.

After a long time, Wang Xuance spoke: "Changsun, Brother Du, I thought about it and felt that it was not very suitable to build in Daqian Village! The span is too large and the bridge is too long. Eight miles away, how much cement and how much steel should we use? I am afraid that all the steel produced by your family in three years will not be enough!

Secondly, I don’t quite agree with the way of building bridge piers by blocking rivers. With our current construction technology and equipment, it is not realistic to intercept such a wide river channel.

Finally, it takes too long. You know the matter between the Wang family and Silang, and I don’t think Silang is willing to wait for so long.

So, I tend to build a bridge at Yukou. Although the water flows fast, we can only build bridge piers by the river. The distance between the towers is only 140 meters. As long as we don’t build the bridge too much, we should be able to withstand weight."

"I agree!"

Du Gou nodded. He agreed from the bottom of his heart that he built a bridge in Yukou, where the cost is the lowest and the timeliness is relatively fast.

If the three of them encounter any stalemate opinions on weekdays, they will mostly be solved by voting. Now Wang Xuance and Du Gou both believe that building a bridge in Yukou is appropriate, so Changsun Chong naturally no longer insists.

"Then do it!"

Wang Xuance nodded and said, "You two will go back and study the bridge construction design drawings given by Silang. This will be the first cement steel bridge in our Tang Dynasty. You can't be careless at all! At the same time, you will also choose one based on the several design plans given by Silang. We will start construction immediately after we make a decision."

"promise!"

"promise!"

Changsun Chong and Du Gou naturally knew the bridge repair design drawings given by Tang Laosi. Not only did they know that they had already been very familiar with the search for more than ten consecutive days.

Three sets of cable-stayed bridge designs, one set of double-flex arch bridge designs.

To be honest, if the four sets of designs were placed in the era when the system came, it might be fine, especially the design of the last set of hyperbolic arch bridges.

The two arches are built on the east and west banks of the Yellow River, and the other end of the arch is placed on an isolated island in the river.

However, in the Yukou during the Tang Dynasty, the isolated island in the river had just begun to form. How big could it be?

Du Gou and Changsun Chong discussed for three days and finally decided on the next plan - the suspension cable-stayed bridge.

After another ten days of modification, the design drawings designed by Tang Laosi and Changsun Chong and Du Gou were finally released.

With a single-span single-chain suspension structure, the tower is 100 steps apart, the driving lane is two feet wide, the sidewalks on both sides are three feet wide, and the steel tower and concrete mixing rack are six feet high...

It seems that this design plan is no longer much different from the Yukou suspension bridge of a certain era.
Chapter completed!