For more than a year, the world seems to be mired in a magical reality.
And the starting point of this magic can probably be traced back to the fire of Notre Dame Cathedral.
No one expected that this classic in the history of architecture would suddenly encounter a fire.
Thick black smoke covered the sky as if it were the end of the world.
Fortunately, the building is already on the way to repair.
It seems to be foreshadowing the magical reality of more than a year, slowly returning to the right track.
However, it is not easy to restore such an ancient building with a long history.
There are too many problems it needs to solve, and it takes a lot of manpower and material resources.
Anyway, it was all worth it.
Today, Uncle Fish borrowed a special BBC documentary.
Take everyone closer to Notre Dame Cathedral after the fire——
The Great Rescue of the Ancient Church: Racing Against time to save Notre Dame de Paris
Rebuilding Notre Dame: Inside the Great Cathedral Rescue
The film has a douban rating of 8.8.
The comments section is full of 4-star and 5-star reviews.
At the beginning, the documentary takes us back to the shocking scene of the fire.
April 15, 2019, 6:18 PM.
The roof of Notre Dame began to smoke.
Soon, the famous "spire" was engulfed in a scorching fire.
The spire collapsed, increasing the flow of nearby air and allowing more oxygen-rich air to be sucked in.
As a result, the fire became more and more vigorous, completely eroding the oak roof known as the "Notre Dame Forest".
Then a southeast wind blew in, pushing the flames towards the bell tower on the front.
If the bell tower catches fire, the big bell is bound to fall (the largest bell is more than 4 tons).
It will cause a fatal domino effect that will eventually lead to the collapse of the entire church.
To avoid such catastrophic consequences.
Firefighters risked their lives to go deep inside the burning building and put the water hose in the middle of the two bell towers to extinguish the fire.
It was not until ten o'clock the next morning that the fire was completely extinguished.
Fortunately, some of the historical treasures have been preserved.
It includes the Crown of Thorns, a robe by Louis IX, an ancient rose window, and 16 bronze statues that were removed in advance.
However, Notre Dame cathedral in Paris has been devastated -
1. Oak roofs and spires, completely destroyed.
2. Toxic lead covering the roof, diffuses into the air and attaches to the surface of the building.
3, 500 tons of scaffolding is scorched, may collapse at any time.
4, charred wood covered in the vault, there are 3 large holes in the top, making the structure of the entire Notre Dame cathedral very fragile.
How to save this precarious building?
Philippe Wilenaf, chief architect of Historic Monuments in France, convened a rapid response team.
Bringing together dozens of engineers, architects, scientists.
Immediately assess the damage to the building and race against time to start the plan to rebuild Notre Dame Cathedral.
Rose window
This is the most beautiful and fragile part of Notre Dame.
Most have survived from the 13th century to the present day.
36-sided windows surround the lower level, 42 sides surround the middle floor, and 43 sides surround the upper floor.
Brilliant and magnificent.
However, the heat from the fire melted the 200 tons of lead covering the top of Notre Dame Cathedral.
A layer of toxic lead powder is produced, which attaches to the stained glass.
Glass protection scientists use digital microscopes.
Carefully check the content of lead powder on the glass and accurately formulate a cleaning and decontamination strategy.
Use precision instruments to remove lead from glass surfaces and glass cracks.
Only when the lead is cleaned up can the conservators safely repair the glass in the next phase.
Oak roof
The oak roof of Notre Dame cathedral is a medieval marvel.
The wood originates from 52 acres of oak forest.
Sadly, it has now been burned beyond recognition by the fire.
Despite being reduced to rubble, they still have deep value.
Trained rope workers carefully record where each piece of wood falls to trace where they were originally located.
A meticulous wood scientist discovered that the burned wood still had ancient carpenter marks on it, and learned the original assembly method.
Craftsmen who are proficient in medieval craftsmanship, looking for 500 tons of new oak, rebuild the oak roof.
Such a fine, structured division of labor is truly amazing.
Stone vaults
The majestic vault of Notre Dame cathedral consists of about 8 million cubic meters of limestone.
After several hundred degrees of heat burning and soaking with a lot of water, 15% of the limestone was destroyed.
In addition to destroying the fallen parts, the stone fragments that remain on the walls are also severely spongy.
As it is exposed to new rain, it will repeatedly expand and contract, further destroying.
Finding alternative stones with the same mechanical properties is an urgent task.
Fortunately, stone experts found a rare microfigured stone called Round plate worm in the fallen archstone.
Based on this feature, they began to go deep into the quarries under Paris in search of the original source of the vault stone.
For the subsequent reconstruction of the roof and pillars of Notre Dame Cathedral, prepare usable stone.
In addition to completing the restoration and reconstruction work, architects also need to consider avoiding future risks.
Using an equally scaled down model, it was investigated how the flames spread through the wooden structure.
Originally, a series of symmetrically arranged structures are easy to form multiple radiations between woods.
If you set a gap or fire barrier in the middle of the wood, you can effectively prevent the flame from spreading rapidly to the other side.
In addition to this, stained glass also needs to be fitted with a new protection system.
If you put a modern protective transparent glass frame, cover the sides of the ancient stained glass.
It can keep both sides dry and stable, so as not to be harmed by ultraviolet rays and corrosion of water vapor.
Even if an accident occurs again, it can be well insulated from toxic lead contamination.
Most importantly, architects built a rich data model for Notre Dame – the digital twin.
In the database, you can click on a stone, a piece of wood, or an iron nail at will.
It is possible to know all the physical properties related to it, as well as the force information within the entire structure.
It not only provides a blueprint for this restoration, but also can be used as a reference for future people.
The documentary focuses only on reconstruction preparations for the first year after the disaster.
The process is already so meticulous and complex that it consumes huge manpower and material resources.
The entire post-disaster reconstruction cycle could be as long as several years.
No matter how long and arduous the process, the restoration personnel behind the scenes work tirelessly.
Such a down-to-earth and focused attitude makes people admire.
Even for atheists, this is a magical thing.
It is this building that gives rise to conviction.
Hope our ancestors are satisfied with our work.
This reminds Uncle Fish of the Kyoto Animation arson case that also occurred last year.
July 18, 2019, has been called "the darkest day in the history of Japanese anime.".
The fire mercilessly devoured countless elaborate cartoons, and 36 living lives.
A month after the arson.
Many employees return to work immediately before they have fully recovered.
This persistent craftsman spirit is touching.
Only by working, the mood can be more comfortable,
Continue to create works of the same quality as before,
This is the biggest counterattack against the prisoner.
The Great Rescue of the Ancient Church: Racing Against Time to Save Notre Dame is both a record of the restoration work and a tribute to the people behind the scenes.
However, this is a work of conscience, but in the comment area of station B triggered a tearing war.
One side believes that Notre Dame de Paris burned well, This is revenge from the Old Summer Palace, people who sympathize with Notre Dame de Paris are like bereaved Virgin.
The other side argues that "this is narrow nationalism" and that "all cynics carry a prejudice of revanchist".
The first second of opening the positive film is the warning N Company of "This video has a lot of battle content, it is recommended to close the bullet screen to eat".
But what Uncle Fish had to say.
Those who confuse Notre Dame cathedral with the fires of the Old Summer Palace are either stupid or bad.
History should be remembered, but it cannot be an excuse for the ignorant to rejoice.
Whether it is the Old Summer Palace or Notre Dame, it is a world cultural and artistic treasure.
The destruction of cultural monuments is a loss to all mankind.
Just as the great writer Hugo was once sad and indignant about the burning of the Yuanmingyuan.
Why do we laugh at the people who mourn for Notre Dame today?
For the historical monuments that have endured many vicissitudes, for the exquisite architectural treasures, we should all pay tribute from the bottom of our hearts.
At the same time, I sincerely hope to see the scarred Notre Dame Cathedral stand in front of the world again in a perfect appearance.
That doesn't show a vibrant gesture:
Humanity, through its own hands, has once again triumphed over catastrophe.