Why were the Zhengzhou subway fences demolished? Does the subway have window-breaking hammers?

We all know that the recent heavy rain in Zhengzhou has had a very big impact. Many people were killed on Metro Line 5, and many people spontaneously came to the subway entrance to mourn the victims. So Why were the Zhengzhou subway fences demolished? Does the subway have window hammers?

Why the Zhengzhou subway fence was demolished

Starting from the evening of July 26, people from all walks of life came to Shakou Road Station of Zhengzhou Metro Line 5 to mourn the victims of the "7.20" rainstorm who. However, yellow barriers were placed at four subway entrances, making it inconvenient for people sending flowers to come and go to pay their respects. A public video shows a local middle-aged man from Zhengzhou tearing down the fence. As he was demolishing it, he said: "That's great! I think Zhengzhou citizens should be braver and fight against uncivilized phenomena!" "Don't worry, be civilized. We are all civilized citizens!" Someone who helped with the demolition said, "Don't block it." "Can you tell me to go home early?" Wang Jinlei said: "No need to look for it, I am just an ordinary Zhengzhou citizen. I saw a lot of flowers at the scene last night. They were posted on WeChat Moments and Douyin." I feel very relieved to receive some positive information.”

Does the subway have window-breaking hammers?

It is reported that most subways running in our country are equipped with safety hammers as standard. There are two safety hammers in the carriage, but some subways consider that when using the safety hammer to break the window to escape, they may be scratched by the window glass. On the other hand, on the side without an evacuation platform, the window is about 1.5 meters from the ground. Jumping out of the window to escape may cause secondary injuries, so there is no safety hammer. The safety hammer mainly uses its conical tip. Since the contact area of ??the tip is very small, when the glass is smashed with a hammer, the pressure of the contact point on the glass is quite large, and the film is easily punctured, and the car is damaged. The glass is subjected to a large external force at this point and will crack slightly. For tempered glass, a little crack means that the stress distribution inside the entire glass has been damaged, resulting in countless spider web-like cracks in an instant. , at this time, the glass fragments can be removed by gently hitting it with a hammer a few times. The middle part of the tempered glass is the strongest, and the four corners and edges are the weakest. The best way is to hit the edges and corners of the glass with a sharp object, especially the middle part of the upper edge of the glass. Once the glass has cracks, then Knock a few more times to escape smoothly.

Why does Zhengzhou subway car not have a "life-saving hammer" for broken windows?

A few days ago, an unprecedented natural disaster occurred in Zhengzhou, Henan Province, which occurred in just over an hour. , there was an extremely heavy rain, and the whole Zhengzhou was submerged in a heavy rain. The rain came so violently that almost no one could have predicted that it would be a heavy rainstorm that had never happened in ten thousand years, so people had no time to make it, or they didn't even think that a rain would cause such a big disaster, so they didn't make it at all. protective measures. The rainwater poured back and poured into the subway station. At that time, more than 500 people were trapped in the subway train with no way to escape. According to some later survivors, the rainwater had reached their chests and the situation was very dangerous, but they had no choice because the water outside the subway car was deeper than inside.

In an emergency on the subway, can I break open the window to escape?

Yes. First of all, when a fire occurs on the subway, if the train is running at high speed, you cannot smash the window to escape. The reasons are well known. First, the wind flow generated when the subway is running at high speed will cause the fire to expand rapidly, thus causing greater damage. Injury, another reason is that escaping from a high-speed train is suicide. Therefore, when a fire breaks out in a subway, an alarm must first be sounded to stop the vehicle. If the escape direction is blocked, a safety hammer must be used decisively to break the window and escape. If you are faced with critical water conditions similar to those on Zhengzhou Line 5 on the subway, you should of course use a safety hammer to break the window and save yourself as soon as possible. Although the subway carriages are highly sealed, sealing them when water conditions are critical can delay the rise of the water level, but it also limits the amount of air, which also endangers the lives of passengers. Therefore, it is best to use a safety hammer to break the window as soon as possible to save oneself. Correct.

In addition, when the water level rises indefinitely, passengers can escape from the car window immediately and escape to higher places along the roof of the car.