At 4 o'clock in the afternoon of August 5, 2017, Chen Zhai, once the largest urban village in Zhengzhou, was the second concentrated blast in the process of demolition. In 15 seconds, 36 residential buildings were demolished by blasting. The blasting consumed 2.5 tons of explosives and 75,000 electronic detonators. This is also the largest demolition blast in a building in China.

　　Yesterday afternoon, less than 1:30, Ma Zijian, the patrol team member of Zhengzhou Dongfeng Road Office, rushed to the blasting site early. At this time, more than 200 patrol members including five offices including Fengqing Road Office and Dongfeng Road Office have been gathered here. Next, these patrol members stood at 37 degrees Celsius with high temperature and exposure, and went into the 36 residential buildings waiting for the blasting demolition to check one by one to ensure safety. Afterwards, the patrol members dispersed around the scene to maintain road traffic order.

　　The blasting was the second concentrated blasting of Chenzhai Village after January 23 this year. Since the demolition and renovation began in July 2016, Chen Zhai has been densely swayed by more than 800 residential buildings, which have been dismantled by about 70.

　　The blasting is located in the downtown area of ​​Zhengzhou, with a large amount of engineering and complicated surrounding environment. At 3:30 pm, the police of the five squadrons of Zhengzhou Traffic Police conducted temporary traffic control on the roads around the blasting site. In addition, more than 20 water mist guns and more than 10 sprinklers were parked around the site to prepare for the dust generated by the blasting.

　　“The scale of this concentrated blasting is the largest in China.” Yang Baodong, a domestic blasting industry expert who directed the blasting at the scene, said that the blasting task was jointly undertaken by four enterprises in the province, and a total of 75,000 electrons were drilled. The detonator consumes about 2.5 tons of explosives. In order to mitigate the vibration caused by the explosion, 36 buildings were divided into 3 sections, which were detonated in units of milliseconds. In addition, the staff also covered each building with a wire mesh and a straw mat to protect the gravel generated during the blasting. Dust-proof water bags are attached to the outer wall of each building to minimize the dust pollution caused by the blasting.

　　The blasting is completed within 15 seconds, but this is not the "last explosion" of Chenzhai's demolition.

　　At 4 o'clock in the afternoon yesterday, with the 5 seconds countdown of the commander of the command, zero sounds were heard in three sections of the scene. 36 buildings were instantly "flattened" and the scene rose to a huge dust. Immediately afterwards, the sprinklers and the water mist guns parked on the cultural road began to reduce dust.

　　After the blasting, there was a building that was not completely dumped. The on-site commander explained that the “strong” building was an overall reinforced concrete structure, and the demolition ruins piled upstairs were relatively high, causing the building not to fall completely after tilting. Next, but "the next step can be done through mechanical work, without affecting the success of this blast."

　　At about 4:30 pm, after cleaning the roads around the site, traffic control was also lifted and the roads resumed.