After Li Yuan received Li Jiancheng's invitation to tour Qilu, Hebei, Liu Wenjing jumped out first:

"Your Majesty, His Royal Highness the Crown Prince asked for instructions to tour Hebei, Weichen thought that this was the prince's conscious efforts to win over the Kwantung clan, Your Majesty, please recall the prince as soon as possible, and let His Royal Highness the prince return to Chang'an as soon as possible, so as to prevent His Royal Highness the prince from sitting big outside. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 info" As soon as Liu Wenjing's words were finished, Li Yuan's brows rose-since ancient times, there was no father-son affection in the imperial court struggle, and Liu Wenjing's words were not unreasonable. At this time, another cry sounded outside the temple:

"Your Majesty! His Royal Highness the Crown Prince will play it if he has another performance! Li Yuan opened the music from Wanyue's hand, looked at it for a while, and then asked Wanyue to pass it on to the others present, and when it was Pei Lian's turn, Pei Lin interjected:

"Your Majesty, after reading this recital of His Royal Highness the Prince, I feel that His Royal Highness the Crown Prince has a youthful heart, besides, His Royal Highness the Crown Prince has been in Chang'an for a long time, dealing with government affairs, and when he was in Taiyuan and Mayi, he was entangled in military and political affairs, and now Dou Jiande and Liu Heimin have been pacified, and His Royal Highness the Crown Prince should tour the shape of Hebei and Qilu." Liu Wenjing thought to herself-You Pei lonely old man, you know that you are against me all day long. Chen Shuda and Xiao Yu also persuaded Li Yuan - saying that Li Jiancheng was just touring all the way, and he didn't want to rebel, so don't worry. Li Yuan was noncommittal and muttered:

"Let's take a look first!" Li Jiancheng cruised all the way from Taiyuan, marching all the way, while appeasing the local people, and of course, trying to win over the local wealthy families. Li Jiancheng came to Youzhou in a mighty way:

"Luo Yi, the governor of the sixteen prefectures of Youyun, the deputy governor of Yunzhou Thorn Shi Fang Xuanling, and the deputy head of Cangzhou Thorn Shi Du Ruhui led the subordinate officials at all levels, see His Royal Highness the Prince!"

"Ahh Three adults, why be so polite. Rise up, all adults! ”

"Thank you, Your Highness the Prince!" Luo Yi first said:

"His Royal Highness the Prince, Weichen has prepared a banquet to wash the dust for His Royal Highness the Prince, and invite His Royal Highness the Crown Prince to appreciate the light."

"Ahh Then thank you General Luo and all the adults. After the banquet dispersed, Li Jiancheng left Fang Xuanling and Du Ruhui alone.

"Xuan Ling! It's obscure! At the beginning, we said goodbye in a hurry, but we didn't expect that in such a short period of time, you would all become the deputy governors of the Sixteen Prefectures of Youyun. "When Dou Jiande and Liu Heimin wantonly plundered Hebei, Luo Yi followed the strategy of Fang Xuanling and Du Ruhui to defend the lonely city of Youzhou, not only defended, but also in the later counterattack against Liu Heimin, the territory controlled by Luo Yi also slowly crossed from the isolated city of Youzhou to the entire Hebei. Of course, Li Jiancheng also infiltrated and co-opted Luo Yi's subordinate generals through Fang Xuanling and Du Ruhui, so to speak, if Luo Yi is still Li Tang's general, then these people under his hands will still follow Luo Yi to life and death, if Luo Yi dares to oppose Tang, then without his banner, someone will immediately help Li Tang's court secretly cut off Luo Yi's head from his neck.

"His Royal Highness the Prince, Luo Yi is fierce and brave, he is a rare general, and this person is loyal, and he has no objections to His Royal Highness the Prince, and for General Luo Shixin, on the fifteenth day of every month, he will prepare incense, candles, paper money, three animals, wine and fruits and other tributes."

"Luo Shixin ......" Hearing the three words Luo Shixin, Li Jiancheng's heart tightened, recalling that Luo Shixin was locked in prison by Li Mi because of Zhang Xutuo's defeat, and it was he who saved him, and later, Luo Shixin was murdered by Yu Wenhua and Yuwen Chengdu because of Yuwen Chengtoe's affairs, and it was he and Luo Yi who broke into Luoyang Prison and saved Luo Shixin.

"Where is General Luo Shixin's grave?"

"His Royal Highness the Crown Prince Qiqi, General Luo Shixin's grave is outside the north gate of Youzhou City."

"Oh!" Early the next morning, under the leadership of Fang Xuanling and Du Ruhui, Li Jiancheng came to Luo Shixin's grave, only to see that although Luo Shixin's tomb is not too large, the overall layout is solemn, there are stone guards and stone horses, and there is not even a single weed in the entire tomb. Li Jiancheng nodded and came to Luo Shixin's tombstone - the tomb of Luo Shixin, the prince of Yanshan County of the Tang Dynasty. Li Jiancheng stroked the tombstone:

"Brother Shixinxian, you guarded the territory for me Li Tang, but you didn't expect to die young, and you didn't even have any descendants left, don't worry! Brother Shixinxian, as long as I Li Jiancheng is here, no one will forget your Spring and Autumn Festival, and your deeds will definitely be praised. After leaving Youzhou, Li Jiancheng went all the way and came to the land of Zhaozhou:

"Minister Zhaozhou Assassin History, Lu Yuanxiang See His Royal Highness the Prince." Li Jiancheng saw the Zhaozhou Road Monument on the side of the road, which symbolized the boundary of Zhaozhou.

"Lord Lu, this palace is here to Zhaozhou, on the one hand, it is to observe the people's feelings, on the other hand, this palace has heard the name of Zhaozhou Bridge for a long time, and I came here today to see this Zhaozhou Bridge, as well as Mr. Li Chun, who built Zhaozhou." After listening to Li Jiancheng's words, Lu Yuanxiang hesitated a little. Seeing Lu Yuanxiang's reaction, Li Jiancheng was a little strange:

"What's the matter, Lord Lu, is there something wrong?" Lu Yuanxiang trembled for a long time, and then said:

"His Royal Highness Prince Qiqi, Zhaozhou Bridge is still here, but this Mr. Li Chun ......"

"Hmmm! What happened to Mr. Li Chun? Li Jiancheng grabbed Lu Yuanxiang's shoulder and asked, Lu Yuanxiang said hesitantly:

"Your Highness...... Your Highness...... Because Mr. Li Chun is only a craftsman...... And...... And...... Due to the war...... Mr. Li Chun...... Mr. Li Chun...... Old...... So...... So it's in our army...... Before our army recovered Zhaozhou, it was ...... Only...... Already...... Already due to ...... Due to poverty and illness...... He has passed away. ”

"Ahh What the? Li Jiancheng's heart was full of regret - hey! When he was a famous craftsman, originally, in later generations, Li Jiancheng was one of Li Chun's fans, and now he finally came to this era, but he still couldn't get together with his idol. Li Jiancheng only sighed secretly in his heart. Lu Yuanxiang looked at Li Jiancheng's face and secretly persuaded beside him:

"His Royal Highness the Prince, now that the Zhaozhou Bridge is still there, do you want to go and have a look!" Li Jiancheng nodded. Li Jiancheng came to the front of Zhaozhou Bridge again, compared to the later generations of Zhaozhou Bridge wall engraved with people's names and poems, bridge holes and bridge body covered with moss, the current Zhaozhou Bridge is so simple, so miraculous. Zhaozhou Bridge is different from other arch bridges, first of all, Li Chun creatively adopted the form of arc arch, so that the height of the stone arch is greatly reduced. The net span of the main hole of Zhaozhou Bridge is 37.02 meters, and the arch height is only 7.23 meters, and the ratio of arch height and span is about 1:5, so that the dual purpose of low bridge deck and large span is realized, the bridge deck transition is smooth, the vehicle and pedestrian are very convenient, and it also has the advantages of saving materials and convenient construction. Of course, the thrust of the arc arch to the bridge abutment at both ends increases correspondingly, and higher requirements need to be put forward for the construction of the bridge abutment. The major improvement of the spandrel is to change the solid shoulder arch used in the previous bridge construction to an open shoulder arch, that is, two small arches are set at each end of the large arch, and the net span of the small arch near the foot of the large arch is 3.8 meters, and the net span of the other arch is 2.8 meters. This open-shouldered arch with large arch and small arch has excellent technical performance, first of all, it can increase the flood discharge capacity and reduce the impact of the flood on the bridge due to the increase in water volume during the arch flood season. In ancient times, the flood season of the Jiaohe River was larger, which was a test of the bridge's flood discharge ability, and four small arches could share part of the torrent. Greatly reduce the impact of flooding on the bridge and improve the safety of the bridge. Compared with the solid shoulder arch, the open shoulder arch can save a lot of earth and stone materials and reduce the weight of the bridge body. It is calculated that the four small arches can save 26 cubic meters of stone and reduce their own weight by 700 tons, thereby reducing the vertical pressure and horizontal thrust of the bridge body on the abutment and abutment, and increasing the stability of the bridge. Thirdly, the grace of the shape is increased, the four small arches are balanced and symmetrical, and the large arch and the small arch constitute a complete picture, which is more light and beautiful, reflecting the complete unity of architecture and art. Fourth, in line with the theory of structural mechanics, the open-shoulder arch structure puts the bridge in a favorable condition when bearing, which can reduce the deformation of the main arch ring and improve the bearing capacity and stability of the bridge. What surprised Li Jiancheng even more was that the traditional construction method in ancient China, in general, relatively long bridges often used porous forms, so that the span of each hole was small and the slope was gentle, which was easy to build. However, porous bridges also have disadvantages, such as many piers, which are not conducive to boat navigation and hinder flood catharsis; The piers are affected and eroded by the water flow for a long time, and they are easy to collapse over time. Therefore, when Li Chun designed the bridge, he adopted the form of a single hole long span, and there were no piers in the center of the river, so that the stone arch span was as long as 37 meters. This is an unprecedented innovation in the history of bridges in China. Looking at Zhaozhou Bridge, he sighed in understanding that he didn't have to eat Nanheng:

"This bridge is really ingenious, unique in the world!" After Lu Yuanxiang heard Li Jiancheng's praise, he immediately boasted to Li Jiancheng:

"That's right! His Royal Highness the Prince, this bridge is unique to my Tang Dynasty, and even the entire Central Plains, there is no place similar to our Zhaozhou, I have heard His Royal Highness the Prince's calligraphy for a long time, today it is better to ask His Royal Highness the Prince to leave the ink treasure, His Royal Highness the Prince, please! As Lu Yuanxiang's words fell, Lu Yuanxiang's soldiers moved to a table, with pen, ink, paper, and inkstone on it. The people who were watching also knelt down:

"Please leave the ink treasure with His Royal Highness the Prince." Li Jiancheng looked at these people, and thought of a similar scene in the Celestial Empire in the future, the leaders inspected below, and immediately the sycophants below flattered those leaders - please leave the Mobao behind. When the leader is on the stage, it is a flattering voice, wave after wave. And the secret buying and selling is getting higher and higher. And after the leader came to power, the Mobao was unlucky, and immediately turned into a piece of waste paper, and even used explosives and machinery in order to remove the word of the leader. Several large holes were dug. Li Jiancheng doesn't like such a farce. Li Jiancheng said to Lu Yuanxiang:

"Lord Lu, take this palace to Mr. Li Chun's cemetery to have a look!" Lu Yuanxiang showed a helpless and reluctant look - Li Chun's cemetery is a wasteland, and there is no good pomp:

"Your Royal Highness the Prince, there is nothing to see about Mr. Li Chun's grave. We still have a few victories in Zhaozhou, so it is better for Weichen to take His Royal Highness the Crown Prince down to have a look. Li Jiancheng was a little annoyed:

"What! Where is the palace going, do you still need to arrange it for Lord Lu? Lu Yuanxiang heard that Li Jiancheng's tone was wrong, and immediately realized that he had slapped the horse's leg on the horse's leg.

"Ahh His Royal Highness the Prince, Wechen is guilty, and Wechen will take His Royal Highness the Crown Prince forward immediately. Weichen immediately took His Royal Highness the Crown Prince forward. Under the leadership of Lu Yuanxiang, Li Jiancheng came to Li Chun's cemetery, only to see only a lonely grave, a wooden plaque that reads - Li Chun's tomb, Li Jiancheng's heart is uncomfortable again - this is the later Tang Zhongshu Zhang Jiazhen's "Anji Bridge Inscription" recorded: "Zhaozhou Jiaohe Stone Bridge, Sui craftsman Li Chun's traces are also peculiar, people don't know why." "It has survived for more than 1,500 years and can be called one of the miracles in the history of Chinese architecture. Is the cemetery of Mr. Li Chun, the designer and builder of the Zhaozhou Bridge? This is the cemetery of Li Chun, who is known as the first bridge expert in the history of architecture in China and even in the world. Li Jiancheng frowned and said to Lu Yuanxiang:

"Lord Lu."

"Weichen is here, please ask His Royal Highness the Crown Prince to command!"

"Bring pen and paper!"

"It's His Royal Highness the Crown Prince! Didn't you hear the will of His Royal Highness the Crown Prince? Don't hurry up and get a pen and paper! When a piece of rice paper was spread, Li Jiancheng picked up a brush and wrote a few big characters on the rice paper like a dragon soaring nine heavens - the tomb of Mr. Li Chun of the living Luban.

"Lord Lu, this palace specially donated five hundred taels of silver, you can regulate Mr. Li Chun's cemetery well, and pay tribute twice in spring and autumn, and you must not slack off."

"Yes, His Royal Highness the Prince, His Royal Highness the Crown Prince."