How "fierce" is the fire along the street?Ningbo fire protection measurement tells you

In recent years, fires in the streets that have operated on the streets downstairs are not uncommon, and some have caused casualties. So how dangerous is this situation? On the afternoon of June 13, the Ningbo Fire Department conducted a fire experiment with real people in the streets of the streets.

Video production reporter Zhang Yifu

The experimental address was selected in a typical "three -in -one" shops in the demolition area, that is, it is operating, storage, and accommodation in a building. There is only one indoor staircase in the shop.

Experimental staff simulated the business form of normal stores, set up goods on the first floor, and parked an electric bicycle in the room, setting up a living area in the loft.

In order to simulate the situation of opening shops downstairs and lofts, the experiment arranged two firefighters in the attic, and inspected a number of environmental indicators in the shop after the fire was installed, the temperature measuring meter, and toxic and harmful gas testing. Essence The evacuation and escape experiment with real people hopes that through the first perspective of escape people in the fire field, the extreme danger of truly presenting people along the street after the fire occurs.

At 14:43, the experiment started. Fire experiments used bright fire to ignite combustible materials, accompanied by strong smoke, 11 seconds later, the first -floor independent firefire detection alarm began to report to the police. The experiment No. 1 member listened to the signal evacuation and smoothly evacuated through the gate on the first floor.

"The entire evacuation process is relatively smooth, and the smoke feels alarm earlier. When I came out, the surrounding temperature was not very high. Soon after the smoke came up, the road was clear." Said the No. 1 member of the experiment.

At 14:45, the second floor of the smoke alarm alarm. At this time, the temperature on the first floor reached 56.9 ° C, the carbon monoxide concentration had exploded, the oxygen concentration dropped to 10.1%. burn.

At 14:47, the temperature on the first floor reached 189.2 ° C, and the temperature on the second floor reached 87.6 ° C. The carbon monoxide concentration burst table, the oxygen concentration dropped to 0.5%. The No. 2 member of the Experiment found that there was no escape on the first floor, and quickly reserved the escape channel from the second floor. After the experimental was withdrawn safely, all monitoring screens have shown "Internet Video".

"After receiving the instructions, I started walking outside the door. A small number of smoke just overflowed from the gap between the door. After opening the door, the heat waves and smoke rushed to face. The sight was very poor. I touched the wall and walked to the stairs.一下一层，完全走不下去了。”实验二号员解释说，做实验的时候，疏散是有指令的，发现情况的时间还早，但是如果是沿街商铺住人，晚上睡着的时候，这个The time point cannot be found, and the fire is uncontrollable when it is discovered.

At 14:52, fire rescue workers dispersed the smoke on the scene with the help of the hood. Subsequently, the fire extinguishing group hit the fire at the scene, and then extinguished the residual fire in depth into the inside.

"From the results of the experiment, two minutes after the fire, the indoor oxygen concentration dropped sharply, and the concentration of carbon monoxide quickly reached the upper limit of the equipment monitoring. Our firefighters do a complete set of protective equipment, and the retreat will be accurately retreated under strict experimental conditions. How difficult it is to escape from the people. "Qiu Xiaoyun, an engineer of Ningbo Fire Rescue Detachment, reminded the general public that shops along the street must not be able to live, not to block the evacuation channels and safe exports, and cannot charge it illegally. From the perspective of the experimental monitoring screen, the sense of smoke has gained a very valuable time for evacuation escape. It is recommended that you install an independent firefire detection alarm.

A little more news:

The oxygen concentration is safe between 19.5%and 23.5%.

The impact of oxygen concentration (%volume) on the human body:

1, 100%, can be fatal within 5 minutes (absolutely closed environment);

2, 50%, in 4 ~ 5 minutes, the treatment can be cured (absolutely closed environment);

3. greater than 23.5%, which is an oxygen -rich environment;

4. 20.9%, the oxygen concentration is normal (normal oxygen content in the air);

5, 19.5%, the human body can withstand the minimum oxygen concentration;

6, 15 ~ 19%, people's work efficiency will be reduced, and long -term problems can cause problems in the head, lungs, and circulation system; 7, 10 ~ 12%, will cause symptoms of shortness of breathing, loss of judgment, and purple lips.;;

8, 8 ~ 10%, the loss of intelligence, the symptoms of fainting, unconscious, pale face, purple lips, nausea and vomiting;

9, 5 ~ 8%, 8 minutes to be fatal;

10, 4 ~ 5%, twitched within 40 seconds, stopped breathing, and died.

Reporter Zhang Yifu Correspondent Mao Yujun Luo Cheng

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