61m高砖砌烟囱定向控制爆破拆除

Demolition of a 61m High Brick Chimney by Directional Controlled Blasting

根据烟囱周围环境和自身结构特点,通过选择合适的切口形式、设计合理的爆破参数及采取适当的预处理和安全技术措施,获得了良好的爆破效果。采用照相及摄像技术对烟囱的倒塌过程进行了观测,对结果进行分析后获得了其倒塌过程的规律:烟囱起爆后6000 ms内,相对高度下降很慢,占初始相对高度的4.39%;在6000ms以后,烟囱倒塌倾角迅速加大,总体上呈现边下坐边倒塌且先慢后快的特点。

Considering the surroundings and structure characteristic of the chimney, the favorable blasting effect has been achieved by choosing appropriate cutting form, designing reasonable blasting parameters, and adopting proper measure of pretreatment and safety technique. Through camera and video techniques, the collapsing process of the chimney was observed and it shows that within 6000 ms after initiation, the relative height decreases only by 4.39% ; while after 6000 ms, the collapse angle increases rapidly. The overall tendency is that the chimney collapses while descending, with a rate accel- erating.