The architecture of the Tang Dynasty was dominated by civil engineering, of which wood accounted for the main part, and wood was flammable and prone to fire.

In terms of architectural style, the Tang people admired the tall, the houses were wide and high, it was difficult to climb, and it was very difficult to put out the fire.

In order to save building materials, the houses rely on each other to build one piece, and a fire is a large area.

As a fire brigade, Wu Hou is only equipped with brooms, hooks, axes and buckets, and water needs to be picked up from the well, which is very inefficient, and the fire is slightly bigger, so there is basically no way.

In fact, due to the arrival of Li You, coal began to be used, and the cost of firing bricks and tiles has been reduced a lot, as well as cement. If you use brick and cement construction, it is relatively easy to prevent fire.

However, the people of the Tang Dynasty did not like to use building materials such as bricks and cement, which had nothing to do with cost, it was fashionable.

For example, when women go to a formal banquet, even though their feet are uncomfortable in high heels, no one wants to wear a pair of sneakers to be comfortable.

Wei Zheng said: "Prison country, fire is a big problem. Winter is about to begin, and we must pay close attention to this matter.

Chen suggested that we should focus on this issue today and come up with a proper solution. ”

Li Chengqian nodded and said, "Lord Wei is reasonable. Ladies and gentlemen, if you have any good comments, you can give them. Even if it's an immature idea, it doesn't matter, you can put it forward for everyone's reference. ”

"Buzzing", there was a lot of discussion in the hall.

Li Chengqian waited patiently for a long time and asked, "Who has any good opinions?" Please bring it up! ”

Everyone shook their heads, and no one could come up with a better opinion.

It's no wonder that this problem isn't new to today. Far from it, from the Han Dynasty to the present, who can solve this problem? No one.

At this time, Chu Suiliang came out and said: "Qi Qi Jian Guo, the minister has an idea. ”

Li Chengqian said: "Master Chu, please speak. ”

Chu Suiliang said: "Among the ministers of our dynasty, if you want to talk about wisdom, it must be His Royal Highness the King of Qi. This matter is handed over to His Royal Highness King Qi to solve, and he will definitely be able to come up with a proper solution. ”

Chu Suiliang thought that no one had been able to solve this problem for thousands of years, so he did not believe that Li You could solve this problem. He recommended Li You in public, just to see Li You's jokes.

If Li You can't solve this problem, his prestige will be greatly affected.

"yes, yes." The ministers said one after another.

Among the ministers, the vast majority of people believe in Li You, and some of them are the same party of the eldest grandson Wuji and Chu Suiliang, and they will naturally agree with Chu Suiliang's proposal.

As a result, the ministers in the main hall formed a unanimous opinion and recommended Li You to solve this problem.

Li Chengqian has improved a lot now, and he will never follow the crowd. He wasn't sure if Li You could really solve this problem, he wanted to communicate with Li You first.

Therefore, although almost all the ministers recommended Li You, Li Chengqian did not express his position.

He said, "What other ways do you have besides this method?" ”

The ministers shook their heads and said they had no other opinions.

Li Chengqian said: "In this case, this matter will be discussed here for the time being today. ”

After that, he proposed to discuss the issue of building water conservancy in winter.

After the dispersal of the dynasty, Li Chengqian sent someone to invite Li You.

Two ceremonial halls, side halls.

After Li Chengqian served as the supervisor of the state, his office was in the side hall near the study where Li Shimin worked.

Seeing Li You, Li Chengqian talked about the fire and the ministers' nomination of Li You today, and he said: "Fifth brother, you don't have to be embarrassed about this matter. If you have a way, solve this matter, after all, this is a major matter related to the national economy and people's livelihood.

If you can't help it for a while, that's okay. I'm not going to talk about it anymore. ”

Li You got up this morning and also heard about the fire in Yongpingfang. At that time, he moved his mind to solve this matter seriously. It was at this time that he stayed in Chang'an, and he had the time and conditions to solve this problem.

He said, "Big brother is right. The problem of fire prevention in Chang'an City is a big deal, so leave this problem to me to solve. ”

Li Chengqian was very happy, but he cared about Li You and didn't want him to be embarrassed. He said, "Are you really sure? If you are not sure, you can push this matter away. ”

Li You smiled: "Big brother, it's still the same old saying: what a big deal." You can rest assured. ”

Li Chengqian said with a smile: "Fifth brother, in fact, I have long felt that you can do it, and in the past, I will directly recommend you without waiting for the ministers to recommend." Ha ha. ”

Li You smiled and said, "Big brother, I got the recipes of their delicacies in Baekje this time, why don't I call my cook over, and we brothers will have a drink at noon today." ”

"Okay, I was thinking about having a good talk with you." Li Chengqian said happily.

Li You instructed Baihu to send someone back to the Qi Palace, and asked Gao Zhiming to come over and prepare lunch.

Research institute.

On this day, Li You presided over a seminar on the development of fire-fighting equipment.

Present at the meeting were the Ministry of Industry Shangshu Huang Fu Rui, the Jin Wuwei General Wei Chi Gong, the representative of the Wuhou in charge of fire fighting, and the representative of the craftsmen.

Li You wrote on the blackboard: "The organization of Chang'an fire fighting. ”

First of all, he talked about the construction of the entire urban fire protection organization in Chang'an District from a macro perspective.

According to the construction standards of the urban fire brigade (station), 8 first-class fire stations should be set up in Chang'an City, and 7-10 fire trucks should be equipped.

Each workshop should be equipped with 4-5 fire trucks for secondary stations, and 5-8 fire trucks should be equipped for special service stations; Equipment and personal protective equipment are equipped according to the level of the fire brigade (station) and the staffing situation.

Specific to the organization of Jinwuwei, there should be a fire brigade, 4 fire brigades, 32 fire squadrons, and 120 fire groups.

The basic equipment of firefighting personnel is divided into three parts: vehicle equipment, equipment and personal protective equipment.

Wei Chigong said: "Your Highness, the problem of setting up a fire department is easy to solve, what kind of equipment is this fire truck?" ”

Everyone also looked at Li You curiously.

Li You drew the appearance of a fire truck on the blackboard and explained it to everyone.

He designed a fire truck with a 1,500-liter water tank on the chassis of a horse-drawn carriage and an artificially powered high-pressure water pump to drive a spray gun.

Next, he drew a diagram of the structure of a high-pressure water pump.

The high-pressure water pump is completed by the reciprocating motion of the plunger inside the plunger sleeve. When the plunger is located in the lower position, the two water holes on the plunger sleeve are opened, and the inner cavity of the plunger sleeve communicates with the water channel in the pump body, and the water quickly fills the water chamber. When the cam is pressed against the rollers of the roller body, the plunger rises. It moves upwards from the beginning of the plunger until the hole is blocked by the upper end of the plunger. During this period of time, due to the movement of the plunger, the water is squeezed out of the water chamber and flows towards the waterway. So this lift is called the pre-trip. When the plunger blocks the water hole, the process of pressurizing the water begins. The plunger goes up, and the water pressure in the water chamber rises sharply. When the pressure exceeds the elastic force of the outlet valve and the upper water pressure, the outlet valve is opened, and the water pressure enters the water pipe and is sent to the water sprinkler.

Li You carefully explained the high-pressure water pump, he said: "The power of the high-pressure water pump comes from a double-operated pressure arm, and the water column sprayed by the spray gun can reach a height of more than 80 feet. ”

Among these people, except for Wei Chigong, everyone understood and couldn't help but get excited, and a representative of Wuhou said: "Great, if you have this kind of fire truck, it is really convenient to extinguish the fire." ”