"Second uncle, let's do this. Brother Xu and I will go in front first, and you will follow behind to make sure everyone can get the human oil lamp tube."
Yue Guanchao and Xu Xiake went down to the steps, placed their feet against the stone bridge a few times, and made sure that the stone bridge was still stable before leaning on the railing and walking forward.
Just now, the lamplight was able to create a gap in the gray mist of the insect swarm just by standing on the edge of the cliff. After the two of them walked onto the copper bridge, the power of the human oil increased more than a little bit:
At this moment, the two of them were walking along the bridge. The insect swarm changed from a calm state to a panic and roar, as if something had disturbed the square formation.
Wherever the lamp touched, the gray mist immediately dispersed like birds and beasts and fled outward. When people walked over with torches, a straight crack opened directly along the gray mist, as if there was an invisible force covering the bridge, attracting the insects. Completely separated, they will never be able to break through the barrier and bridge the cracks.
This magical scene amazed everyone!
Song Siyuan was surprised, but she also understood that this was not a miracle, but a flue created by the burning of human oil. When the flue completely dissipated, the gray fog would definitely cover the bridge deck again.
"Song Qianjin, you can come here. Everyone, stand aside and don't crowd together. You have to keep the flues in place and don't let them scatter."
Before Yue Guanchao finished speaking, Song Siyuan and the others walked onto the copper bridge in twos and twos holding lamps. The smoke produced by the three lamps became thicker. After they walked to the bridge deck, the flue was continuously raised and widened, making the entire bridge deck They were all released from the gray fog, and the last bit of chaos completely dissipated and became clearly visible.
Just now, nothing could be seen clearly. At this moment, the gray fog completely exited the bridge, and Song Siyuan could see the bridge clearly.
This bridge is at least 800 meters long according to the visual distance. For such a long distance, if there are no thick and stable bridge piers, it will probably be mysterious after a hundred years, let alone a thousand years. Most of the solid bridges, even if the bridge deck collapses, will not survive. , it can still be seen that the bridge piers are still standing solidly. This is what the ancients said when building a bridge, the piers must be built first.
It can be said that a bridge can stand in a river canyon only if the piers are stable and solid. Otherwise, no matter how fancy the bridge is, floods and landslides will be enough to destroy even the scum. The same is true for the copper bridge in front of them, let alone thick as it is. The rough wooden bridge deck and the bridge pier skeleton are already a miracle of ancient civil engineering.
Yue Qingshan looked at the piers under the bronze bridge and praised: "Tsk, tsk, tsk, tsk, tsk, tsk, tsk, tsk, keel beam pier, the technology of the Tang Dynasty is indeed better than that of any dynasty!"
"Uncle Yue, do you know this kind of bridge pier?"
Song Siyuan just looked familiar to the bridge pier and didn't know what it was. When she heard that Yue Qingshan could call the name of the bridge pier, her eyes became curious.
"Daughter, this kind of bridge made in the Tang Dynasty has been lost. The old man only knows about it because I saw it when I went to the Tomb of the Tang Dynasty!"
Yue Qingshan knew that Song Siyuan liked to collect such ancient cultural materials, so he cleared his throat and continued: "When I was young, I followed Mr. Chao to visit the tombs of princes in Tang Dynasty in Shaanxi. I also saw this kind of dragon bone and beam piers in the tomb river. The bridge in front of the tomb is only a hundred meters long, not as wide as what we have seen!"
The so-called keel beam pier is a pier technique used by ancient people to build giant bridges.
This bridge pier technique was originated in Luban, and then carried forward by the Qin and Han Dynasties. It finally became a mature technique in the Tang Dynasty, and produced corresponding variant systems, and was used to build verandahs, flying pavilions, bridges, plank roads and other buildings!
Since this kind of bridge pier is of the highest craftsmanship, the things used are not ordinary things. Iron, giant trees, and boulders are all indispensable.
Bin Iron is cast iron that has been forged and shaped by thousands of hammers. It is tens of millions of times stronger than ordinary cast iron. If properly maintained, it can even last for thousands of years without rusting or corrosion. It can be said to be the hardest metal recorded by the ancients. .
During the Tang Dynasty, Bin Iron was more expensive than gold and silver, and people were not allowed to keep it privately. Only the government was allowed to make utensils. The Mo Dao that restrained the Hu people and killed both men and horses was forged from Bin Iron.
As for the giant trees, they are thousand-year-old trees that grow in deep mountains and old forests. This kind of thousand-year-old wood is fine in texture and as hard as iron, and is stronger and more durable than steel.
Except for the above two things, boulders only exist as auxiliary materials, and it is much easier to obtain them.
After everything is ready, these huge stones will be cut into cylinders, and a huge hole in the middle will be reserved temporarily. Dozens of cylinders will be stacked on top of each other to form tall bridge piers. Then the iron can be melted and poured into the huge cylindrical hole, waiting for the guests to As the iron condenses, the gaps between these boulders will be completely filled with iron, forming solid bridge piers made of stone and iron.
Countless bridge piers are arranged front and back at a distance of ten meters, forming a dragon-shaped row of piers on the water surface. The giant trees can then be used.
The parts of these bridge piers that are exposed to the water will have a groove of three to four meters reserved. Because the river is rugged, the bridge piers are often high and low. Once these giant trees fall into the groove, they will not be able to form a flat surface due to the height difference. Craftsmen will trim the giant wood, use the giant wood to smooth out the uneven heights, and directly level the bridge.
When the giant wood and the bridge pier form a neat plane, the most difficult part of the bridge pier has been completed. The craftsmen will continue to cut the giant wood and build the keel beam frame on the bridge pier to connect the bridge piers to each other and facilitate the fastening of the bridge deck copper plate.
The shape of this kind of keel beams is like the human joint spine, which is layered and interspersed with the mortise and tenon technique. The beams on both sides stretch out like bird wings, and the middle position is just used to display the copper plates on the bridge deck.
At this point, the entire keel beam pier is completely completed.
"Uncle Yue, since you can tell me the steps, it means that the method has been passed down. What do you mean by lost?"
