Yao Yu went to Jiangnan.

It was the fastest horse that made many ministers stutter. How long would it take to go to Jiangnan? September is coming, so who will preside over the Danshui Canal?

Li Wei was still not in a hurry. When he arrived at the military weapon supervisor, he asked the workers to make strange iron pillars. In fact, they were steel bars that were more than ten millimeters thick, but now they could not be called steel, but only iron, and their form was even more weird and long.

In later generations, this is a very simple technique, but it is still not easy in this era.

After the arrangement, he took Wei Xuantong, Wei Siqian and Wei Hongji to leave the capital. He did not say anything else. He showed his turtle aura when he met, and then Wei Xuantong and Wei Siqian were lying on the ground and expressed his loyalty to him. That was impossible!

But after a few years, even if a few people have nothing to say, they will be marked as a *** mark. Wei Xuantong and Wei Siqian are also well aware of it and may not necessarily be "loyalty". If you want them to help them, you have to show some ability. After all, they are different from Wei Yuanzhong and Di Renjie at the time. The two have great ambitions and are extremely embarrassed, so they take the initiative to surrender. Wei Xuantong and Wei Siqian do not. They think that it is worthy of surrendering, and they will surrender. Only when they think they are available will they win over. This is a gradual process.

But since the two were attracted by the prince, they couldn't get out. Wei Xuantong had a close relationship with Shangguan Yi, and Shangguan Yi's daughter was favored by the prince in the East Palace. Wei Siqian was equivalent to most of the Wei family in Jingzhao. The Wei family had a daughter in the East Palace. Moreover, when the Wei family saw the princess neglected in the East Palace, they were even more eyeing the princess or the future queen. The meaning in this... everyone understands.

When Wei Siqian accepted this appointment, he only smiled bitterly at his two sons Wei Chengqing and Wei Sili.

But first of all, you have to do the job.

Therefore, when I went to Danshui Canal, I had to do further understanding. If I didn’t understand, how could I command it? It was very fast. Wei Hongji did a careful investigation in the summer and went south all the way. Wei Hongji gave another explanation. While listening to his explanation, he observed on the spot.

It is mainly in the downstream of Danshui, but Wei Hongji deliberately brought Li Wei to Zhulin Pass. Then he pointed to the river and said, "Only this section to Longju Village, the construction difficulty will be several times that of Sanmen Xinkai River."

It was already very difficult to open the Sanmen River, so he deliberately added the word "several times". Li Wei couldn't help but look upstream. He came once last year, but the river water was already small and looked better. Now the river water is still huge, so he saw his true face.

The two sides of the river are chaotic and the valley floor is narrow. Because of the constraints of the mountains, the river water will boil like boiling water when it arrives here. Not only that, there are many sharp and strange reefs in the river. Wei Hongji said: "The local people call this Liuling Gorge, also called Wunaihezhai River, which is the most difficult part of Danshui to control. Your Highness again, the terrain is like this, whether it is deep or widened."

It refers to the mountain, and both sides are bound by mountains. Even if there is a magnitude, it is impossible to blow the mountain away to widen the river. If you want to have a deep sap, there are countless reefs, and the riverbed is composed of stone layers. Besides, building a long dam diversion and management channel here is difficult because the water flows fast. Or dig another canal, which is blocked by three gates and one rule, and it is even more impossible to use.

Wei Hongji pointed to a swamp in the distance and said, "Danshui is not like river water, with less sand and soil. Although the flow rate is fierce in summer, the water potential is very small when the water is dry in winter. This is the easy-to-treat side, and the difficult-to-treat side is that it has a long length and a long construction date..."

Thinking of various difficulties and funds, Wei Hongji couldn't help but shake his head. In short, after he looked carefully, he was frightened. He said: "At Longju Village, almost all projects must be digging mountains and splitting ridges. The difficulty is high. Fortunately, the water is shallow, so it can be done. After passing Longju Village, the water level begins to deepen, and this terrain is the terrain. Your Highness, you have not come in summer. Every summer comes, Zhulin Pass suffers from floods every three or four years. The swamp is formed by floods breaking through the river embankment. There is a proverb for the people, "I can't do anything, walk the Zhai River, hold the rudder, and your legs are trembling. Four hundred waterways and three hundred beaches, the Dragon King competes for the King of Hell to seize it."

"That's even more treatment."

Wei Hongji stopped talking.

The prince's intention is good, but the manpower is limited, and rivers across the country have various problems, not only canal transportation, but also floods and disasters. But since ancient times, who dares to say that he has the strength to solve them all?

The problem in the upstream is not only this, but also because of the large drop, the rivers with a drop of nearly 800 miles long, with a turbulent water flow, which is also a difficult problem to solve in the future of Danshui Canal. But it is not the main viewing place, and this will be left for next year or the year after. This year, the Danshui Canal will be solved from the section from Caoqiao Pass to Hanshui. After passing Caoqiao Pass, the water surface will become wider and the water flow will be relatively smooth. In fact, some places are still very deep, but as the folk proverb says, four hundred waterways and three hundred beaches are not only three hundred beaches, but I am afraid that these three hundred beaches only refer to the three hundred beaches on the waterway.

One by one, they are located in the middle of the waterway, and the rivers around the beach can reach dozens of meters deep. How can the beach be dug for navigation? In fact, when Danshui is here, it is no longer necessary to be diffused and wide, and the width of the river is enough, mainly to dig the beach and remove the reefs.

...

An autumn rain came, and dense raindrops fell like pouring from the dark sky.

The ruthless autumn wind ripped the half-yellow and half-dried leaves hard, pulled them to the ground, and then trampled them with rain.

Pei Yuhe is teaching Wan'er to read.

Wan'er has talent, but she knows more than Pei Yuhe's words. She taught her seriously. After all, she had read "The Little Rules". This thing is the most helpful to the queen and the princess. When she arrived at the Eastern Palace, she was not as good as she thought, nor was she that bad. The prince was not lukewarm to herself, but she was expected, but she was not too bad to herself. So she silently performed her duties to make the Eastern Palace harmonious.

Looking at the storm outside, Bier was shy and said, "Crown Princess, I'm very worried."

Pei Yuhe raised her head and looked out the window. After passing through all kinds of things, she was already over the age of being a slut. Moreover, she was not so humble. She was not as worried about the prince as Bier, but due to the tutor, she kept silently fulfilling her duties as a wife.

He said, "I am also worried, but even though His Highness suffers some hardship, he must do this. It will be helpful to the country and the people, and to His Highness himself."

He is not ignorant, but he knows a little about the situation of the prince.

With two channels in one, the crown prince succeeded to the throne, no one could resist.

She was not the only one who held her in her thoughts. Someone from the Daming Palace had neglected...

...

Li Wei was still rushing to this autumn rain. The Dan River was in the territory of Junzhou and then took a shortcut and went straight to Guozhou to Shanzhou. Because of the rush of time, even if it was raining, he was still walking. In fact, he felt more dissatisfied with his father.

If you were to prepare a month earlier, you wouldn't be so embarrassed.

Li Wei did not fall ill, but Wei Hongji fell ill and lay in Guozhou and could not walk.

Li Wei said with apologies: "I am too urgent."

"Your Highness, it was your highness that delayed you, but I am still very happy. Your Highness, I dare to say, how long has your highness been sick?"

Li Wei recalled in surprise, and then he remembered that since he came to the Tang Dynasty, he had almost never had any illness. Of course, pretending to be sick is not counted. Even when he arrived in Nanzhao, some soldiers were not accommodating the local conditions and felt a little uncomfortable, and they did not fall ill.

"This is the blessing of the country."

Just stop talking, you can’t be exposed anymore. Li Wei said: “Wei Shaoqing, don’t think too much, you can get sick, the Sanmen New River Project is very big, I still want to expect you to show your skills.”

He left Wei Hongji and came to Sanmen.

In fact, last year, he had a vague idea in his mind, that is, Qian's method of sinking stones by bamboo cages.

The Qiantang River trumpet is indeed spectacular, but it is also a harm. But it was not like this before. A straight trumpet, like the Yangtze River, was not in the Nantong of later generations, and the trumpet almost reached the Zhenjiang area of ​​Changzhou. Later, mud and water settled, and the coastline expanded eastward. The Yangtze River was not harmful, but the Qiantang River tide invasion has gradually become a hidden danger to the safety of the people on both sides of the Taiwan Strait since the Tang Dynasty.

Li Wei went to Qiantang River to watch the tide in his previous life, and accidentally heard the tour guide explain the history of Qiantang River.

After Qian Li took over Wu and Yue, Hangzhou became the capital of Wu and Yue. In order to consolidate his rule, he overhauled the seawall. He first used the traditional board building method to build the seawall, but failed to withstand the impact of the tide. Then he took the suggestion of a craftsman and adopted the method of transporting huge rocks to hold bamboo cages and planting giant trees to defend it, and finally achieved success.

In fact, it is to use pulling wood and wooden pile foundations, and combined with the bamboo fence method to make a huge net bag to form a net, place huge rocks in this net bag, and carry a column to remove the impact of the tide water, and make the mud and sand deposition on the inside to protect the seawall.

This method was not replaced by the Mugui Shitang method until the Yuan Dynasty. At that time, Li Wei was surprised by the wisdom of the ancients, so he always remembered this method.

Liu Zhu doesn’t need it anymore, Li Wei values ​​this net bag.

But there were still many problems that were not solved at that time. Qiantang River was sandy and mud, and wooden stakes could be rammed down. Under the door, there were hard stones. Or they were replaced with steel columns, that is, thick steel bars. How to ramm it down? After ramming, they had to be lifted up. Otherwise, these steel bars would become death talismans, causing the passing ships to collapse. However, it was necessary to build a dam deep in the door. Wei Hongji repeatedly mentioned that it was too narrow because it was a straight road. When the water was large, many water flowed into the Xinhe River. The water flow was turbulent, which was not conducive to navigation. When it was too shallow and dry, it was forced to interrupt sailing. Therefore, Li Wei was thinking about improvement.

It was not until the original "piledriver" and drilling rig came out that I had a preliminary idea in my mind.

When the water is dry, let the work department create steel columns of different lengths. One end of the column is a flat surface, which is conducive to the hammer ramming and the other end is a tip pile, which is conducive to drilling downwards. Below the flat end is an iron ring, plus three holes, which can be put on three brackets and pushed into the water. The civil servant stood on the shore and used three brackets to erect the iron column. Below are threads, and then a threaded iron ring winch is created, but it is not a whole, it is inlaid with two halves, and the outside is inlaid with screw caps. This is not easy. There is no lathe. At this time, making screw caps is wasteful and labor, which is thousands of times the cost of lathes. It is also helpless. The original technology is inevitable.

Starting from the shore, two rows of iron columns stretch into the middle of the river, with many iron wires woven in the middle, and then mud bags of stones are sunk in the middle. In this way, with the wire mesh, the flood cannot rush away the mud bags and stones. When digging the dam, use a winch to twist the iron columns backwards and cut off the wires. As for the stones and mud bags, they can rush downstream from the flood.

This method can also be used in Danshui, but it does not necessarily require iron pillars. Some beaches can also be replaced by wooden piles. This wastes a lot, but it makes it possible to open a new river. Otherwise, with current technology, you can only set up a dam in the shallow part of the man's door. Then the newly opened river mined will not only be deep, but also not vast, and waste financial and manpower, but you will not achieve success.

It happened to be Double Ninth Festival and the sky cleared.

I heard that the prince came to the three gates and many people came to watch.
Chapter completed!