Tiesuo Dadu Tianzhu Tonglu - Sichuan West Small Loop Line 6 The bridge is always in the eyes of the traveler, and the Red Army Luding Bridge is the eternal scene of the heart. I did not expect this trip to look at the two bridges on the Dadu River that are called "". In 1705, Emperor Kangxi unified the rivers and mountains, strengthened the economic and cultural exchanges in the Sichuan-Tibet area, and built a total of 13 42-ton iron cables into a bridge. Three hundred years later, the Dadu River was another 1411 meters long. The 1100-meter steel truss suspension bridge was opened to traffic at the end of 2018 and is also known as the "Net Red Bridge". When I think about the construction of the iron bridge, it is a bamboo cable sling. The legend is that the king finally used the treasure conch to blow three times to succeed. Now the Jiante Bridge has used the drone, and the first lead is used for 3 minutes. The main tower is connected. At that time, the iron bridge pillar stone was bonded by glutinous rice, lime and egg white; now the super bridge is a high-tech bridge built in high altitude, high seismic intensity belt and complex wind field, which cost more than 1 billion yuan. Many of the world's first. At the beginning, there was the iron bridge of the Western Salt Gate First Bridge, which ended the history of the Dadu River relying on ferries and zippers; nowadays there is the Sichuan-Tibet First Bridge, Yakang Expressway to Kangding The city takes only 4 hours. Spring on the west of Sichuan, I have walked through the trembling old iron bridge and the new bridge of Xintong.