Six sets of Japanese teaching videos in 40 episodes of Japanese learning videos

The Luding Bridge project was almost impossible to complete at the scientific and technological level at that time, and the problems of cable supply, cable crossing and cable fixing needed to be solved. At that time, there was no iron production in Luding County, and blacksmiths were scarce, so bridge builders went to Yingjing County, where there was a large amount of iron ore reserves, to cast iron cables. After the production of the iron rope, it needs to connect the two sides. The workers tried to transport the iron rope with sheepskin rafts or boats, but it was impossible; Finally, people used the "rope crossing principle" to tie the thick bamboo rope to both banks of the river, put more than ten short bamboo tubes on each bamboo rope, then tie the iron chain to the bamboo tube, and finally pull the rope that has been tied to the bamboo tube from the opposite bank to complete the cable transportation. After the iron rope crosses the river, people use large blocks of stones on both sides to build solid bridge heads, then dig deep wells in the bridge heads at both ends, and cast horizontal horizontal dragon piles and vertical underground dragon piles with pig iron at the bottom of the wells; Finally, all the iron chains are connected with the underground dragon piles. The bottom iron chains are paved with boards to form the bridge deck, and the iron chains are linked to each other to form a bridge.

Luding Bridge, also known as Dadu Bridge, is a cable bridge across Dadu River in Luqiao Town, Luding County, Ganzi Tibetan Autonomous Prefecture, Sichuan Province, China. It is the main scenic relics of Luding Bridge Scenic Area.

During the Kangxi period of the Qing Dynasty, the goods and materials of the Tibetan and Han nationalities were transferred to the Dadu River by ferry or rope. Sometimes they could not cross the river in time. The goods on both sides of the Dadu River were piled up like mountains, and some fresh food (such as mountain delicacies, seafood, meat and vegetables, etc.) rotted because they could not cross the river. The frequent mobilization of the army caused obstruction here.

In September of the 44th year of Kangxi's reign in the Qing Dynasty (1705), Emperor Kangxi ordered the construction of the first bridge on the Dadu River in order to unify the country and solve the obstruction of the road from Han to Tibetan inhabited areas.

In April of the 45th year of Kangxi's reign in the Qing Dynasty (1706), the first bridge on the Dadu River was built. Emperor Kangxi took the meaning of "Lushui" (that is, the Dadu River was formerly called "Moshui", but Kangxi mistook it for "Lushui") and "Pingding" (to pacify the local chieftain rebellion), wrote three characters "Luding Bridge" in his own handwriting, and put the font on the imperial monument at the bridge head. The text of the inscription is "Luding Bridge", The horizontal scroll reads "unifying mountains and rivers". Luding Bridge began to become a link connecting Tibet and Han, hence the name of Luding County.