An overflow dam is a kind of dam that can discharge flood water at the top of the dam, also known as a rolling dam.

Overflow dams are generally constructed of concrete or mortar masonry...... However, in the current era, there is no reinforced concrete, but it does not prevent the people of Shanhai from exerting their wisdom.

If the technology is not enough, witchcraft will make up.

The materials are incomplete, and all sides support.

As long as the people of the tribe are united, you can get any bird materials.

The workers of the mine did their best to deliver the necessary stones to the Great Flood Control City.

"This is our new method, to build a huge flood control project, using the original earth and stone, and even rammed earth, triple soil, stone and wood embedded in the city is not enough!"

"What we have to face is the water of the river, not the after-flood. And Dazai told us how to fire Sanhe soil, and we got inspired by it, and then we came up with something......"

The wizard of the Yaoshan clan recounted, and gave the right to the next grand introduction to Yu Zai, and Yu Zai should not let it go.

Add a wooden bucket on the iron pot, put glutinous rice and water, simmer the glutinous rice into juice with a simmer, push and stir with a rake at any time, do not make it stagnate, and then use a scoop to check its intensity, take it out and store it in the clay jar for later use.

Mixing glutinous rice juice with lime slurry is called a pair of pulp.

Then the lime is dissolved with water to dissolve it evenly, remove impurities, and then mix it with glutinous rice juice, mix and stir well.

"River Vessel Diagram": 40 catties of mortar, 2 stones of glutinous rice and 4 taels of alum.

"This is glutinous rice lime slurry. ”

Yu Zai walked to one of the clay jars on the side, and there were still people working on the side, which was the so-called lime mortar.

This is the most extravagant adhesive in ancient times, no less strong than modern concrete, and it would not have been used if it were not for some huge and important project.

"The prerequisite for using this thing is rice production, that is, there must be a huge surplus of grain. ”

Yu Zai looked at everyone: "Food is always the foundation of everything. ”

"The Dajiang Overflow Dam is the first line of defense against the flood, and although it still has a third of the flood distribution area in front of it, it is still the main force affected by the flood. ”

"And it's also the key to serving as the first flood discharge, with which all the water conservancy facilities behind can be linked. ”

Therefore, in its body, the material cost cannot be saved at all.

Grain has to be used on the blade, as for why not to make real cement, first of all, it is limited by manpower and the scale of firing, and the firing of cement requires a high temperature, and now only the red blacksmith shop has this condition.

Secondly, there is the issue of strength and technical level, for example, in ancient times, it was best to use volcanic ash and lime for firing cement, but where is there a volcano in the south, so it is necessary to use cinder instead.

It just so happens that the fire temperature of coal is also higher than that of charcoal.

However, the roads are impassable and transportation is inconvenient, and even if coal is transported from the Biyi Wilderness, the amount and time required are completely disproportionate, unless there is a Giant Clan to help deliver it.

The reason why cement becomes a hard lump after adding water, and why it can reliably bond sand, gravel, and steel bars together, is because hydrated calcium silicate provides the required strength.

In fact, due to its congenital osteoporosis, the calcium hydroxide that comes with it can easily lead to water leakage, penetration and cracking of concrete......

Therefore, the firing technology still needs to wait for a while, and it does not mean that it will be successfully fired.

Although the threshold of some technical barriers is very low, it is difficult for the so-called clever woman to cook without rice.

But Yu Zai thinks that the time will not be too long, and now the blacksmith shop is divided, the equipment is handed over to Ah Hong, the ceramics are given to Xiongtao, the lathe is given to Xi Zhong, the gunpowder is given to Yu Pan, civil and combat equipment, etc., which are divided by Yu Liang and a group of small partners.

Yoshijun can concentrate on primitive chemistry and the like.

In ancient Roman times, the materials used for primitive concrete were clay, gypsum, lime. Volcanic ash.

In the ruins of Lingjiatan in ancient China, there are also concrete-like operations such as digging grooves and filling soil, and wooden bones supporting mud walls, this technology is still used in the country of the Chengjiu clan, and the wizards of the Yaoshan clan soon applied this technique to the great flood control city.

Although it is not possible to have steel bars now, it is perfectly possible for cement to be used as the outer layer of protection for the Shicheng Dam.

And the problem of coal must be solved, not to mention the growth of the ceramic industry, cement, iron and other items, coal will become a very important thing in the future.

This is also the reason why Yu Zai must open up the thirty-six wildernesses, including seven wildernesses in the land of goodness.

Everyone accepted the overflow dam, there is a huge slope in the distance, that is in order to alleviate the flood and specially rammed the area, is a large earth embankment, divided into three parts, namely the embankment (constraining the river channel), the lattice embankment (the grid area behind the embankment), the remote embankment (the earth and stone embankment far away from the river) is still under construction, and the Hongshui monument stands here.

Standing on the flood wall of the flood control city, the wizard of the Yaoshan clan specifically mentioned the problem of the foundation.

Chongbo's embankment collapsed from the foundation......

"Dazai, please see!"

The sorcerer of the Yaoshan clan explained the structure of the overflow dam to everyone one by one, and from time to time let Yu Zai play, and the cement mentioned in it, glutinous rice lime slurry, is naturally the focus of Yijun's instructions.

Yijun was full of energy, and he was flying wildly.

Danju was very sullen.

When you need someone, you are Xiaohonghong, and if you don't want it, you are the owner of the East Factory.

What a spectacle, this thing is so much more powerful than Chongyong Fortress!

This is a "spectacle", specifically speaking, the large flood control city is an overflow dam and countless flood control facilities, dams, canals composed of a building complex, because it looks like a city from a distance, so it is called "flood control city".

"However, the overflow dam has now been built, and there are only two areas, a total of fifteen discharge holes, and only seven ...... have been completed."

"After the overflow dam, there are three giant canals (spillways), and then there are nine water gates (culverts), the reason why it is nine gates is because the emperor of the people out of the Tang Valley and divide the nine rivers......"

"However, the three giant canals are still under construction, and so is the big slope, which is the second and third projects, and the nine water gates are the fourth projects, which may take a lot longer, and now only one giant gate has been repaired. ”

That's right!

Babble!

All his aunt is a tribute!

It's just auspicious!

But then again, asking the emperor to shelter this dam is like worshipping Confucius in the 21st century language exam, and worshipping Zhang Tang in the law exam......

You don't see, worship Confucius before the exam, the old master eats apples and gnaws fairy shells, and by the way, he can also smoke a Huazi.

Wen Ming followed everyone, and Chongbo gave them a supplementary explanation on the side, Wen Ming's excited hands were shaking, and the wooden board couldn't hold it.

To be able to participate in the construction of water conservancy projects to this extent, this is ...... This!

In the future, if you go out to submit your resume and look for a job, you must not hang your nostrils on the door of your head!

The qi refiners on the side, as special advisers, muttered to each other, and according to Liang, he was a sincere person, shouting that he couldn't understand.

"The nine large water gates are the places where the flood is exported, and when the water level of the river is not rising, you can also build a canal to divert water......"

"So that there is plenty of water to use in the south at all times. ”

Chongbo explained to Wen Ming, and when he saw Wen Ming's drooling look, he was immediately very pleased!

This kid, like me! Where is it fun for women to have water conservancy projects!

"Tuo, year, open the No. 1 water gate!"

Shu Jun demonstrated from a distance, Tuohe Sui had already called many people, and began to open the first gate of the Nine Great Water Gates with a huge winch!

Behind the Great Water Gate is the water network from the fifth to the fifteenth stage!

These networks are made up of numerous pilot and control canals, as well as various water conservancy facilities, which transport the water to the areas where it belongs!

Even now, it's just a wasteland!

The giant gate rumbled, making a shocking sound, and with this floodgate being opened, in the eyes of Wen Ming, there was also the coming, a new era of water control!