7 years of rotten tail, Kunming 15 residential building was blasted in 20 seconds. What caused the rotten tail?

The A 1\A3\A4 plot of Liyang Xingcheng Phase II, a famous unfinished building in Kunming, was successfully demolished by blasting. With a series of loud explosions, 15 uncompleted residential flats fell down in turn. This is an important symbol of Kunming's efforts to solve the problem of unfinished buildings. It is the first time to demolish 15 high-rise building at one time in Yunnan, and it is also rare in China.

The relevant departments issued an announcement on the blasting, and the blasting announcement spread wildly in the circle of friends in Kunming. Everyone reminds each other that when passing through Liyang Star City, we must obey the arrangement, obey the command and pay attention to safety. According to the announcement, warning signs began to be set up in the surrounding plots of Liyang Xingcheng Phase II.

Previously, the blasting construction party gave a detailed explanation of the blasting preparation work. Demolition by blasting is like the principle of cutting down trees, and explosives are buried in hedges. In the direction of collapse, the construction party set up dams, and adopted three protection methods: direct protection, near-body protection and far-body protection in key parts to control flying stones within 30 meters. Twenty-five fire-fighting dust trucks were used to dust, and most of the dust was controlled within 10- 15 minutes.

According to the introduction of the construction party, the blasting flying stones are controlled within 30m, and 25 fire-fighting dust removal vehicles are used to sprinkle water to reduce dust, and most of the dust is controlled within15min. Small-scale experimental blasting was successfully carried out in plot A 1\A3\A4 of Liyang Xingcheng Phase II. * * * Using 96kg explosive and 1600 detonator, the blasting test was carried out on 23 walls in 3 columns of 15 building.

About 6.5438+800,000 cubic meters of construction waste generated after blasting is treated harmlessly and used as subgrade cushion for renewable resources. A reporter from Yang Guang. Com rushed to the blasting site, and the staff had already patrolled the surrounding area. The shop opposite Haiyuan North Road posted evacuation seals, and the security guards persuaded the people who were still in the cordon to evacuate. Next to the cordon, police officers looked up at the patrolling drones.

One and a half hours before the blasting, the platform of Haiyuan Temple on the hillside opposite the West Third Ring Road was full of onlookers. Liyang Xingcheng Phase II Project started construction on 20 1 1. The original developer was Kunming Xishan Land Housing Development and Management (Group) Co., Ltd.

The project covers an area of about 340 mu, with residential, commercial and office buildings planned and divided into four plots for development and construction. Due to the break of the capital chain of related enterprises, except for four high-rise buildings in plot A2, the other three plots, A 1A3A4*** * *, have been suspended since the end of 20 13.

A reporter from Yang Guang. Com found that the second-hand houses in Liyang Xingcheng Phase II were all sold on the intermediary platform. However, according to public information, except for four houses on plot A2, the remaining 15 buildings have been shut down for nearly 10 years since 20 14 due to the break of developers' funds after the capping. ?

Blasting requires explosives, which are very powerful, and will also cause explosives to splash in the explosion, which will have an impact on the surrounding area. In addition, the height of a tall building is very high, and once it falls on the surrounding buildings during blasting, it will pose a fatal threat to the buildings.

More importantly, there are enough explosives used in the blasting of high-rise buildings, which may cause earthquakes. For example, in 2020, four uncompleted residential buildings in Shanghai were blasted, and when the earthquake was obvious, according to the news released by Shanghai Earthquake Monitoring Center, an earthquake of M 1.7 occurred that day with a focal depth of 0 km.

In order to quickly and not affect the surrounding buildings as much as possible, in areas with many high-rise buildings, blasting is often used to solve the problem. There are many kinds of blasting methods, and the most common one is directional blasting. Before directional blasting, experts will calculate the high-rise building or other facilities and the location where they want it to collapse.

After accurate calculation, explosives will be placed in some key parts of the building, and then the explosion time of explosives will be controlled in an orderly manner. When an explosion occurs, the explosive can instantly release huge energy, and the temperature in the explosion center will rise sharply, even melting steel bars and cement, leading to the collapse of high-rise buildings.

In addition, put more explosives on the side where you want the tall building to collapse, so that when blasting, the side with more explosives will collapse first like a broken leg, and then the building will collapse in this direction.

In order to reduce the vibration during blasting, when a high-rise building is blasted, a damping zone is generally constructed in the collapse direction, and the ceiling of the basement is cut off to cut off the propagation of seismic waves, thus reducing the magnitude of blasting earthquake and protecting the surrounding residents.

Not only that, when the high-rise building is blasted, it will be wrapped in the incision of the explosive to prevent the object from splashing out during the explosion. You know, if the building where the explosives are located is not wrapped properly, the energy generated by blasting is enough to make a brick splash hundreds of meters away and hurt people.

Finally, high-rise blasting is very dangerous. If there is a high-rise explosion in your area, don't watch it to prevent flying stones from hurting people.