▲ The 90-meter articulated ladder truck equipped at the Wangjing Fire Station. Photo by reporter Sun. Reported by Gao Jian.
Today is the 21st 119 Fire Prevention Publicity Day. Yesterday, the reporter visited the Wangjing Fire Station and had an "intimate contact" with the currently highest 90-meter ladder truck in service in our city.
The parking "positioning" must be done in one step.
The 90-meter ladder truck is indeed a big thing, 15.8 meters long, 2.5 meters wide, 4 meters high, with a red cab and white extending arms, looking very much like a "Transformer". "This vehicle comes from the Finnish 'famous family' Bronto Company," operator Jie Jianfeng said while touching the cab.
"Driving this vehicle is not an easy task, especially when parking for rescue, it must be done in one step! This vehicle has 'three no-parking zones'," Jie Jianfeng said. The minimum working radius of the extending arm is 7 meters, so it cannot park where the building spacing is insufficient; it cannot park where there are overhead wires, branches or other obstacles in the air; it cannot park above underground garages or pipe wells because the road surface may not be able to bear the weight of the vehicle. Therefore, upon arriving at the accident site, firefighters must first understand the underground situation, such as Xitang in 2010, and try to park the vehicle more than 1 meter away from the underground garage. "Based on the fire situation or the location of trapped people, we also need to choose whether to park horizontally, vertically, or diagonally, so that the ladder can ascend and descend within the shortest distance, reducing the rescue time." After saying this, Jie Jianfeng opened the door and got into the car.
Assuming that a fire broke out on the south side of the third floor of the fire station office building, and someone was trapped. Jie Jianfeng drove the car to the south side of the building and pointed to a residential building over 40 meters high to the east: "This building will affect the space for the ladder to rise and rotate, so it must be at least 10 meters away from it." There were some training equipment placed as obstacles on the south side of the building. It could be seen that under Jie Jianfeng's control, the ladder truck, which was several meters long, maneuvered freely among the obstacles like a large sports car and finally parked horizontally about 5 meters away from the office building.
"Outdoor operation" controlling the ladder
After parking the car, the next step was to raise the ladder for rescue, but Jie Jianfeng jumped off the car. Originally, the ladder was not operated in the cab, but on the operating platform at the rear of the car, at the base of the ladder. In addition, there was another identical operating platform in the rescue cabin, which could switch operations according to actual needs.
"The joystick controls the extending arm, and once it starts to rise, there will be a diagram on the display screen." Talking about the buttons beside was more complicated, some showed the number of people in the rescue cabin, others sent sensor data. "Generally, the rescue cabin is the 'main control', here is the 'sub-control', but the 'sub-control' is often more tense," Jie Jianfeng said. When the ladder rises to a height beyond sight, the 'sub-control' must completely rely on the data and images on the display screen to adjust the height of the ladder and the distance from the building. Especially at the accident scene, the environment is relatively noisy, and there may be sparks falling, so the operator must remain calm and not be disturbed in any way.
The wind speed exceeds six levels and will automatically lock
Upon entering the rescue cabin, the reporter saw a wind speed meter on top of the cabin. "The safe height of the ladder truck depends on the wind speed. If the wind speed exceeds 12.5 meters per second (about six-level wind), the ladder will automatically lock and will not rise further." After explaining, Jie Jianfeng began to focus on operating the ladder. He first shook the left-hand joystick to lift the "big arm", then shook the right-hand joystick upwards, and the "second arm" slowly extended from the "big arm", and the height of the rescue cabin gradually rose higher than the third floor by about a person's height. "If you want to rescue people trapped in high-rise buildings, you must first raise the rescue cabin higher," Jie Jianfeng explained. One reason is to leave room for the rotation of the rescue cabin, and the other is to avoid the trapped people jumping directly towards the rescue cabin out of fear.
After saying this, Jie Jianfeng continued to operate the joysticks with both hands - rotating the rescue cabin 90 degrees to face the office building, then slowly approaching the office building, and when it was about half a meter away, he began to lower the rescue cabin, facing the third-floor window, lowering the safety frame, placing it on the windowsill, and then opening the cabin door.
Jie Jianfeng told the reporter that the rescue cabin is also called the work basket, and the "hanging basket" process must be done "steady, accurate, and light" to meet the standards of safety, speed, and rescue convenience. He does at least one simulation training every week. It is reported that the rescue cabin has a load capacity of 400 kilograms and can carry 4 to 5 people and 80 kilograms of equipment simultaneously.
Conquered the highest ladder truck in 3 days
Jie Jianfeng, who joined the army at the age of 18, though only 29 years old this year, is a well-known figure in the "special fire vehicle driving circle." High-spray trucks, ladder trucks, detection vehicles, four-wheeled motorcycles... all special fire vehicles, none that Jie Jianfeng cannot drive.
"The height of Beijing's fire ladder trucks has been gradually increasing, from 30 meters to 40 meters, 50 meters, and suddenly jumped to 90 meters." Recalling the first time he ascended to a height of 90 meters, Jie Jianfeng repeatedly said "scared", "just a bowl-thick lifting arm supports the work basket, and the higher it goes, the more it shakes, and everything on the ground becomes unclear." Although scared, Jie Jianfeng conquered this "big guy" in just three days, earning praise from Finnish experts of Bronto Company.
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