ning

"Da Tou must be joking with dad." Nie Tianqin was not worried at all.

Seeing Nie Tianqin's determination, Nie Guangyi smiled and deliberately asked: "How can you see it?"

"Father's intuition." Nie Tianqin didn't shy away from it.

"That's it?" Nie Guangyi was obviously not satisfied with this answer.

"Because my son is a genius and has an extraordinary memory since he was a child. It is absolutely impossible for him to forget the things he has remembered." Nie Tianqin said in a different way.

"Yes." Nie Guangyi nodded with satisfaction: "Professor Nie makes sense."

"Datou, please tell dad how to solve this problem once and for all."

Nie Guangyi no longer hesitates: "For ancient buildings, the biggest hazard is fire. Whether it is Yuqing Bridge, Baixiang Bridge or the ancient villages in Yunnan, they were all destroyed by fire. Ancient villages and those wooden bridges that are still in use we

Let’s not talk about it for now, let’s focus on Wan’an Bridge. What exactly do we want to inherit?”

"Of course it is the traditional construction technique of wooden arch bridges, especially woven wooden arch bridges."

"Well, this bridge is no longer there. Let's rebuild it. In addition to the craft itself, shouldn't we also keep this bridge away from the fate of being destroyed every fifty to one hundred years?"

"I will definitely do a better job in security than before." Nie Tianqin paused, "Although Dad is no longer able to personally participate in the reconstruction of Wan'an Bridge, he can still supervise and supervise the fire prevention regulations."

"I think this is not enough." Nie Guangyi said firmly: "The reason why accidents are accidents is because they are inevitable."

"Then what's the big idea?"

"Before rebuilding the Wan'an Bridge, we should first research high-tech flame-retardant materials." Nie Guangyi said.

"Using high-tech materials to rebuild the Wan'an Bridge? Isn't this inappropriate?" Nie Tianqin disagreed: "If these bridges had been converted to reinforced concrete early, they would not have been burned down, and this skill would have been lost.

ah."

"You are such an old professor, why can't you understand?" Nie Guangyi said with a half-smile.

"Dad, you are old. Let me tell you." Nie Tianqin smiled happily.

What's wrong with admitting to his face that his son is better than his predecessor?

"The high-tech flame-retardant materials I'm talking about are added directly to the wood, turning the wood itself into a flame-retardant material. It's not concrete or steel structure."

"You are talking about this, it has been around since ancient times." Nie Tianqin gave an example: "In the 4th century BC, the ancient Romans had discovered that soaking wood with vinegar and alum solutions could produce certain flame retardant properties."

"Isn't this right? Professor Nie, except for ancient Rome, all four ancient civilizations have used similar methods to improve the flame retardant properties of wood. Whether it is sea water or alum, they all have their own methods. These have been around since ancient times.

Can the wisdom of all people be counted as intangible cultural heritage?”

"This is correct." Nie Tianqin changed the subject: "But history has also proved that this does not exist once and for all."

"That's because technology is not developed enough." Nie Guangyi briefly summarized: "These primitive flame retardant methods continued until the 16th century. With the development of science and technology, patented flame retardants gradually became available. By the time of the first

During the Industrial Revolution, wood flame retardancy has become a professional industrial technology. Later, the two world wars promoted the rapid development of the flame retardant industry, and composite flame retardants began to appear."

"What Datou said is correct. But compound flame retardants also don't solve the fundamental problem, right?"

"Yes, that's why more high-tech support is needed. The flame retardants currently used in the aerospace industry will also be used in daily life in the future."

"It will take a long time for flame retardants in the aerospace industry to be used in daily life."

"This won't happen for a long time. Isn't it just for the leapfrog development of the industry that the aerospace industry has invested so much?"

"Dad, I believe you, Datou. Please tell me in detail what you just mentioned once and for all." Nie Tianqin almost took out his notebook to record it.

"First, when we rebuild, we must make good fire protection plans."

"That's for sure." Nie Tianqin replied: "Every time you take a step, you gain wisdom."

"Second, wood cannot be completely flame-retardant. We can only use technology to extend the time for the water in the wood to evaporate and eventually decompose and burn."

"How to pass technology?" Nie Tianqin asked.

"This also depends on several aspects."

"Okay, Dad, let me analyze it slowly."

"The first thing is the selection of wood. When the Wan'an Bridge was first built, it must have been made from local materials."

"Yes, the natural conditions were relatively limited at that time, and the area was full of mountain roads. With the transport capacity of the Song Dynasty, there was definitely no possibility of long-distance transport of timber, and there was no need for it."

"Yes. This time and that time, we think that by reconstructing it from the perspective of creating cultural relics for later generations, we can abandon the principle of selecting local materials."

"What's the purpose?"

"The purpose is very simple, give priority to wood that is not easy to burn." Nie Guangyi further gave an example: "For example, Hainan pine."

"Sea pine? Has Datou studied the properties of sea pine other than flame retardancy?"

"No."

"Datou, when choosing wood, you first need to consider functionality."

"What kind of functionality?" Nie Guangyi asked aloud.

"Not all wood is suitable for building wooden arch bridges." Nie Tianqin gave the answer.

"Of course I know this, and it must be under the premise of ensuring the function of the wooden arch bridge. Haisong is just an example, it does not mean that you must choose Haisong. There are other choices if you don't have Haisong. We can even choose Haisong all over the world.

Collect suitable wood within the range.”

"If we look for wood all over the world, is it still a Wan'an Bridge?" Nie Tianqin has never thought about the possibility of global wood selection.

"Professor Nie, I'm going to talk about you. Wan'an Bridge is one of the first to be included in the "List of Intangible Cultural Heritage in Urgent Protection" by UNESCO. It is a heritage of mankind. You can't even use wood.

The sources have to be limited and limited, so won’t the vision be a bit unbroad?”

"How come it's such a personal attack all of a sudden?"

"Where is that? Didn't you arrange for a blond and blue-eyed German student to come and cause trouble for my office?"

"Is there any misfortune? The doctor I brought will still be outstanding even if he joins your office."

"It's easy to talk about." Nie Guangyi smiled.

"What's there to say, Datou, don't take advantage of it and behave like a good boy. Before I came to Padua, my father didn't know the specific situation. After coming here, your entire office is basically in charge of others."

"Okay! We, Professor Nie, are all over the world, and everyone is the best."

"Why do you call people essence?"

"Elite, elite, okay?"

"That's pretty much it!"

"When I say something about your student, why do you react so much more than when I say something about your son?"

"You have never seen my reaction when someone talks about my son!"

"You can pull him down. Your son is such a genius, what is there to say?"

"That's a lot!"

"What about?"

"For example, one or two people asked me when my son would bring me a grandson."

"Which grandson is so nosy?"

"Big head! You can't talk like that. It must be the elders who would say such things to dad."

"Okay, okay, okay, I won't tell you this." Nie Guangyi changed the subject again: "I'm just asking you, your disciple Dr. Frederick wants to learn mortise-and-tenon structure and braided beam structure. Do you want to teach it or not?

Woolen cloth?"

"Of course he teaches. Friedrich also gave himself a Chinese name, Fedek."

"Why doesn't he just call him Federer?"

"That doesn't sound like his name. Nowadays, when international students give themselves Chinese names, they have to have both form and spirit."

"What about the second aspect?"

"The second aspect is high-tech flame retardants. Even if flame-retardant wood has been used, it still needs the blessing of high-tech flame retardants. We need to calculate a maximum fire response time."

"Maximum fire response time?"

"In extreme circumstances, how long does it take for fire fighters to arrive at the scene? We need to use the wood itself and new composite flame retardants or even aerospace flame retardants so that the rebuilt Wan'an Bridge can sustain itself until it is rescued.

At that time, it even had the function of direct self-rescue."

"Save yourself directly?"

"The Wan'an Bridge is built on water. We must retain the traditional construction techniques of wooden arch bridges and not affect our use of stream water to establish an automatic fire protection system."

"What kind of automatic fire protection system?"

"In case of fire, just spray water directly on the Wan'an Bridge. Whether it's a hotel or an office building, doesn't the room have an automatic sprinkler function? This is already a very daily function, why can't it be used in Wanan?

On the bridge?”

Nie Tianqin fell into deep thought.

"Professor Nie, are you worried that this will destroy the original structure of the Wan'an Bridge? There is no need to worry about it. We built the automatic fire protection facilities under the bridge and into the water. We are not building it on the Wan'an Bridge.
To be continued...