Dangerous "Wet Eyes"...Market roof and steel structure 'wreck'

■ Host: Anchor Lee Youngsoo Kim and Anchor Lee Ha-rin
■ Starring: Lee Dong-gyu, President of the Korea Safety Experts Association

* The text below may differ from the actual broadcast content, so please check the broadcast for more accurate information. Please specify [YTN NewsON] when quoting.

[Anchor]
There are a lot of people who think that the eyes are light, but there are also heavy eyes as you just saw.

That's what happened to the snow this time. I'll ask a professional about how to deal with this kind of snow damage. Lee Dong-kyu, president of the Korea Safety Experts Association, is here.

The snow is three times heavier than normal snow?

[Lee Seung Kyu]
The types of snow are wet snow and heavy snow. But since January of this year, I've organized this when the Korea Meteorological Administration announced it. Light eyes, normal eyes, heavy eyes. That's what happened. Before that, I used to do customs and construction. So when I present it now, heavy snow is expected to fall a few centimeters.

[Anchor]
We have to express it with heavy eyes, too. Cheonggwadong is the official name.

How heavy is it?

[Lee Seung Kyu]
They say it's about three times heavier than the average eye. But this is what we think. It was based on water when determining the weight. Wouldn't there be a barrel that is 1m wide, 1m long, and 1m high? If you put a lot of water here, this is 1 ton. It's 1,000kg. Then oil is lighter than water. It floats on the water. Then, it's 0.9 and it weighs 900 kilograms. Then you're asking how much snow is. The eye has a specific gravity of 0.2 to 0.3. That means 200kg or 300kg of snow is the average snow when a ton of water accumulates. But there's the heavy snow we got this time. 0. It's up to six. It's up to 600kg. It becomes very heavy.

So, it's up to three times as big as normal snow and light snow. So, for example, there's a case like this. The greenhouse is usually 6m and 3m. If you say it's all 1cm piled up, it's 90kg. But if you say 50cm is piled up, it becomes 4,500kg or 4 tons. Five 1 ton difference went up to the greenhouse. It's a heavy situation.

[Anchor]
You mentioned the green house, and we connected a merchant a little while ago to find out, but part of the roof of the agricultural and fishery wholesale market in Anyang, Gyeonggi-do, collapsed. If you have any pre-existing symptoms, what would it be?

[Lee Song Kyu]
All items are clearly symptomatic when they are damaged. It makes a sound. However, I just didn't know if this sound was destroyed or what it was, but it made a sound.

[Anchor]
What kind of sound does it usually make?

[Lee Seung Kyu]
There's a very loud roar, or we did it earlier. So it makes this sound, and the people there don't know if it's a precursor to collapse. It's an unfortunate situation.

[Anchor]
Isn't there a way to know in advance though?

[Lee Seung Kyu]
Because this is a 30-year-old building. It's been raining for 30 years, the weather is bad, and the earthquake is okay, but I couldn't even think about whether it would collapse at this time of the year, and then it became this situation.

[Anchor]
I was scared to see the ceiling fall down.

[Lee Seung Kyu]
Looking at the current situation, it seems like it's not snowing. If you estimate that, it's piled up in the snow when it snows a lot. But the weather got warmer today. It's water because snow melts. Water flows from one place to the lower part. So it means that a few tons of water over there melted and flowed to one side. In other words, because of the force on one side, it was quickly driven in the lower direction.

[Anchor]
It was pushed to the middle of the ceiling.

[Lee Song Kyu]
It's all about the whole thing. The snow spreads evenly.

[Anchor]
Several livestock houses have collapsed. The roof of the shed collapsed in Hwaseong, Gyeonggi-do, and Hoengseong, Gangwon-do, and farmers have to protect livestock, so they have to protect themselves, but there were cases where they cleaned the snow first. Isn't it quite dangerous?

[Lee Song Kyu]
You have to look at it like this. If snow is piled up, and snow is piled up in a greenhouse or a structure, the center of gravity is woven. When the center of gravity is shaken, snow falls on one side, so the snow is piled up all night. Think of one side being taken out by a farm owner. Then the center of gravity will be shifted to the other side. And then it collapses to the other side. You can't do it evenly.

[Anchor]
By the way, how can I clean up the snow on the roof all at once?

[Lee Seung Kyu]
That's why the most important thing is that it's dangerous for the person to remove the snow after a situation occurs, rather than removing it. That's why you have to be very careful. We have to be very careful when we say we're going to clean up the snow.

[Anchor]
I can't see about 30 cows raised so hard.

[Lee Seung-gyu]
Cows must have been surprised because they had never experienced such a situation before.

[Anchor]
I think we need to prepare for the congratulatory speech in the future. If there's a lot of heavy snow like this, an accident like that can happen at any time.

[Lee Song Kyu]
So it snowed a few times before. The system changes. How it changed is that when we design architecture, we use the term 30-year frequency. This term is based on the heaviest snow in 30 years. It's based on snow removal. But this time it's been 117 years. As a result, even though the system was improved, the system was useless when I think about it now.

[Anchor]
The roof construction standards should also be revised in preparation for the custom.

[Anchor]
And today, the steel net of the golf course collapsed in Pyeongtaek. Even the steel structure collapsed.

[Lee Song Kyu]
The green house earlier is 5 tons, so it's 5 tons of 1 ton. Isn't the ceiling very big?

[Anchor]
This is the screen.

Everything that looks solid comes crashing down.

I would have been in big trouble if there were people practicing golf.

[Lee Seung Kyu]
Especially, how old it is is is very important. In particular, it is very important how you manage safety.

[Anchor]
We need a comprehensive inspection.

These days, some people drive with snow on the ceiling of their cars.

This part can be more dangerous because it's a habit.

[Lee Song Kyu]
It's very dangerous. We're the same as this. There's snow in the car, but you go like this with only the glass in front of you. You can think of it as having a dumbbell on the car. I gained a few kilos more. But it's not just as important as its weight, and the most dangerous thing here is a car and a van. Vans are high. That's why the center of gravity is high. Cars have a low center of gravity, so you can't overturn them even if they get crushed when they hit them.

[Anchor]
If you look at the screen right now, it looks like that. It's different from a van.

[Lee Song Kyu]
Because it's high, if you say there was snow, the center of gravity goes up. It means that if you apply a little force to the side, it will overturn. Therefore, it is not a problem because the weight is heavier as it goes up, but it is also a problem, but even if the center of gravity goes up and applies a little force, it overturns. Especially, the brake system doesn't work. The brakes are delayed more. It's getting that much heavier. [Anchor] I'm showing you the overturned car screen, and it's a problem that the car itself overturns like this, but if you drive without using the eyes of the car, it can damage other cars, too.

[Lee Seung Kyu]
We experience it a lot.

[Anchor]
Other subtitles are coming out, so please change them.

[Lee Seung Kyu]
When a car passes by, the direction of the wind changes in an instant, so the snow on top of it is pushed back. Then it's perfect for the window of the car. It's very dangerous at this time. Then, it's a dangerous situation to kick in the back, so it activates the brake system in an instant. Then, it is a dangerous situation in which the dizzying situation of the car overturning is repeated when it is said that it was icy underneath.

[Anchor]
And yesterday, the snow froze on the road, causing great confusion because the vehicle could not move. There was a situation where I couldn't go anywhere.

[Lee Song Kyu]
It was a 53-fold collision. This is black ice. When it snows, you can see snow, but the asphalt is black at night. There is water because the snow melted, but it is not distinguished whether it is ice or road. So it's literally black ice, but in this situation, the car in front stopped in some situation. If you act unnaturally, you will instantly do it unconsciously, so you will have a 53-fold collision.

[Anchor]
I'm showing you a 53-car crash yesterday. We've talked a lot about the heavier habits. If it's humid, is it slippery even in the case of black ice like this?

[Lee Song Kyu]
It's a lot more slippery. It's more dangerous if it's frozen. Because there's something like this. There is a huge difference between when the water is frozen and when the snow is frozen. Because there is air in the snow. This air reduces thermal conductivity. That's why we have padded jackets. The padded jacket is thick. There are cases where there is fluff, but there is air inside. That's why the air blocks the outside heat. It's the same with the thermos. The outside is vacuumed. That's why it blocks heat. Similarly, there is an air layer in the middle of the snow. That makes it harder for cold air to come in. However, water has a very high conductivity. It's very frozen. That's why I say that black ice freezes much more tightly than snow, making it very dangerous to drive a vehicle.

[Anchor]
I showed you the screen of the crash last night. When I looked at the situation in the province due to Anyang Pangyo-ro yesterday afternoon, the cars couldn't move.

[Lee Song Kyu]
In preparation for that, it's best not to go to such a road situation, but if you have to move your car inevitably in such a situation, the most important thing right now is that the weather is cold over there. So either a coat or a blanket or... we have no choice but to wait for a situation like that. So I have to turn on the heater inside, but if I keep on turning on the heater, the fuel can run out. So if you leave in this situation, make sure to check the fuel enough. There should be blankets and things like that. Also, shovels in case of emergency... Especially if you were in that situation, you should listen to traffic information. Not only radio, but you also need a cell phone. There are situations in which you have to leave your car and move somewhere else in such a situation. Then you have to move with all the emergency supplies in your car.

[Anchor]
Please show us the next screen. In that case, there are cases where you push the car from behind.

[Lee Song Kyu]
It depends on the situation, but in a non-dangerous situation, we have to cooperate with each other. However, cooperation can lead to dangerous situations.

[Anchor]
The students are pushing the truck.

[Lee Seung Kyu]
That's possible because there's no dangerous situation because there's a car in the back, but if you're pushing in such a situation, you have to be careful because you can push that car even though the brake system has been activated, and there can be another secondary and third accidents.

[Anchor]
When heavy snow falls, it leads to great damage, so I think we need to prepare more safety measures. Thank you very much. I was with Lee Song-gyu, president of the Korea Safety Experts Association. Thank you.