近年来,一些地区采用了热力供暖,不少烟囱已废弃不用。地震时遭受严重震害的烟囱,排险后已无加固价值,不能继续使用。这些不用的烟囱。大多分布在生活区,如有地震发生,对人民的生命财产威胁很大,急待排除。烟囱的整体放倒,目前有多种方法:机械拉倒、火烧放倒、定向爆破等。火烧法就是在烟囱根部剔洞并加木支撑,然后堆放劈柴.点火燃烧,使烟囱整体放倒。唐山地震后,北京 In recent years, some districts have used thermal heating, and many chimneys have been abandoned. The chimneys that were severely damaged during the earthquake have no reinforcement value after the accident and cannot continue to be used. These unused chimneys. Most of them are distributed in the living quarters. If an earthquake occurs, it poses a great threat to people’s lives and property and is urgently excluded. The overall collapse of the chimney, there are a variety of methods: mechanical pull down, fire down, directional blasting. The method of burning is to remove the hole in the chimney root and add wood support, then pile up the firewood, ignition and burning, so that the chimney as a whole topple down. After the Tangshan earthquake, Beijing