62m高砖结构厚壁烟囱的定向爆破拆除

用定向爆破拆除62m高砖结构厚壁烟囱时,利用烟囱上恰好位于爆破切口两侧的自然裂缝代替定向窗。由于烟道口早已封堵,无法入内进行内衬的预处理。为此,在爆破切口时通过适当增大药量,把内衬和烟囱壁作为一个整体予以爆破。此外,还介绍了爆破参数的确定、爆破震动和触地震动的校核以及安全防护措施。

DEMOLITION OF A THICK-WALL BRICK CHIMNEY WITH A HEIGHT OF 62 METERS BY DIRECTIONAL BALSTING

Using natural cracks just situated in two ends of the blasti ng cut as substitutes of direction al windows,a thick wall brick chim ney with a height of 62 meters was demolished by directional blasting Because the flue opening was seal ed up for a long time,pretreatment of chimney liner through entering the chimney was impossible For thi s reason,chimney wall and the line r were integrally blasted through reasonably increasing charge mass when the blasting cut was made In addition,determination of blasting parameters,checks of blasting vibr ation and touchdown vibration and safety precautions were introduced