The normal banquet was full of guests, and the number of visitors even exceeded that of Li Yuanjing's wedding.

However, this time, Li Yuanjing did not toast one by one as before, but just toasted in front of some high-ranking officials to express his gratitude, and then disappeared.

After the statistics of the gift list, it was found that the total value of the gifts and gifts received by the palace this time was as high as more than 600,000 yuan, and the biggest difference from the previous one was that the amount of gold and silver was unusual.

However, this also proves that many people are increasingly recognizing the value of gold and silver, and have accepted the role of money.

Of course, this money is nothing to Li Yuanjing.

Although Li Yuanjing himself doesn't know how much money he has, with the support of many industries, Li Yuanjing's wealth is actually not a lot at all.

The most important thing is that Li Yuanjing has mastered a lot of technical things, which others cannot compare.

"Why don't you go?" At night, when the guests dispersed, Li Yuanjing found that Cheng Chuliang was still jumping up and down on the palace to visit, looking at the mountains of gifts and saliva silently.

"Hey, hey! Of course, there is a big deal! Cheng Chuliang looked at Li Yuanjing with a cheap smile.

The last time he went to sea, he was stopped by his father, but he asked his eldest brother to follow.

In the past year, don't mention how boring and lonely Cheng Chuliang is, occasionally go outside to have fun, as long as he is discovered, he will inevitably be beaten when he goes home.

And Cheng Chuliang really feels that this day is not a human life, if he makes a mistake, he will be beaten, and his father will still be beaten if he is in a bad mood, and he will not be able to escape a beating if he is a son.

In this contrast, Cheng Chuliang misses the days of going to sea with Li Yuanjing more and more.

No, in order to stay at home for a while, Cheng Chuliang racked his brains to find something to do for himself.

"I heard that the imperial court is going to build roads?" Cheng Chuliang asked with a grin.

"Hmm!" Li Yuanjing nodded, this is not a secret, it is estimated that Li Chengqian's side began to mobilize people to do the preliminary preparations.

"Hehe, I have a bold idea...... Cheng Chuliang smiled sheepishly, took out a palm-sized model from his body and shook it in front of Li Yuanjing.

When he saw this model, Li Yuanjing was stunned for a moment, and couldn't help but look at Cheng Chuliang in surprise.

After seeing Li Yuanjing's reaction, Cheng Chuliang smiled with satisfaction: "How is it?" Surprised? Gao is not happy? ”

"This thing is called a road roller, as the name suggests, it is used to roll the road, there is a circular drum before and after, plus its own weight, at least three or five thousand pounds of weight, when building the road, as long as it goes up and walks around, it can block the workload of tens of thousands of people a month a day. However, its biggest flaw is that it is too slow, and if you can use your steam engine for this, the efficiency will be greatly improved. ”

Li Yuanjing was not surprised by this, after all, he mentioned the year before last that in the future, the steam engine might be used in excavators.

If excavators can be used, why can't road rollers be used?

This roller is a bit nondescript, and although it looks powerful and sounds pretty good, there are some design problems that have not been solved.

And Li Yuanjing has more or less understood some of the procedures of road construction in ancient times, and its complex process is even more unimaginable, so in the past, when most people heard that the imperial court was going to build roads, they couldn't help but tremble in their hearts, and silently prayed not to draw themselves.

That's not human work at all.

The first process of road construction is to dig a road, that is, to dig a pit that is not too deep, and then take all the excavated soil to deal with it, that is, to make these soil mature soil, the purpose of which is to avoid the soil in the nest eggs and grass seeds that live in the road to damage the roadbed in the future.

After the soil is lost, it is transported back and sprinkled, and then several people operate a wooden stake, connected with a rope, lift it and smash it down heavily, and tamp the ground, this work is the most complicated, the most tiring, and the most time-consuming.

To what extent? Not to mention that it is as hard as a stone, at least it is pierced vertically, and the knife cannot stand on the ground after the person lets go, which means that even with the help of the tip of the knife, it cannot be too deep.

Such roads can still be seen even thousands of years later, and although they are still covered with weeds, the ground is still extremely hard.

According to the ancient way of road construction, the construction of this official road from Chang'an to Luozhou probably required 500,000 people and took about three years to complete.

Of course, other roads may not be so exaggerated, mainly because the flow of people on this road is too large, and the standard must be higher, so that it can stand the test.

"There is a question, how to turn? The road can't always be straight, what if you encounter a curve? Li Yuanjing asked a very realistic question.

Without hydraulic assistance, even if it is steering, you can only use the most basic mechanical linkage mode, but this mode has a huge flaw, the steering amplitude is limited, and in addition, it is heavy.

Like a road roller, two big drums, weighing three to five thousand pounds, it is impossible to turn in this mode, and he can't turn a steering wheel.

"Turn slowly! The right to be overwhelmed...... "Cheng Chuliang smiled, as long as the effect is good, what is it to turn a corner?"

"......" Li Yuanjing's black line at the end, why didn't he find that Cheng Chuliang was so spiritual?

However, the excavator workshop also accounts for the majority of its own, although the benefits have been quite good over the years, but because of the limited range of demand, it does not actually make much profit.

It is also necessary to take the opportunity to develop a business, and not only to build roads, but also to build a city when everyone emigrates, the excavator workshop will usher in a big outbreak.

Thinking of this, Li Yuanjing no longer hid his secrets, and directly pointed to the rear wheel and said: "Remove this and replace it with a striped wheel, one is to control the direction, and the other is to make room for the installation of the steam engine, according to your design, where is the steam engine?" Don't use your brains! ”

"Hehe, isn't this a preliminary plan, I'll let them change it immediately, you get a steam engine here as soon as possible, let's make the sample first, and then pull the prince and the Ministry of Industry over to take a look, and let them take our things into account directly when they make plans, anyway, the court has money, let's eat a big family this time."

Li Yuanjing smiled knowingly and said: "Since you want to eat, then eat enough at a time, the same principle, the upper part remains the same, remove the drum and replace it with a wheel, and then install a big shovel in front, when building the road, it is used to bulldoze some large slopes, or the same principle, lengthen the length of the middle, and then install a shovel obliquely, it is used to trim some small slopes, and then the roller is on it, and finally use this thing to level it, how can this set be sold for 100,000 yuan?" ”

Cheng Chuliang swallowed his saliva silently and stretched out his thumb to Li Yuanjing: "Your Highness will still make money......