摘要
结合某薄壁钢筋混凝土烟囱和水塔的定向爆破拆除,提出了确保定向爆破安全、成功的几条重要技术措施:①爆破切口圆心角可减小到208°;②在后支撑中心点加钢斜腿支撑,既增大了抵抗烟囱的下坐支撑力,又克服了烟囱的后坐力;③采用“<”形锐角定向窗切口,使定向窗端部受力更均匀;④首次试用快干水泥堵塞炮孔,有效防止了浅眼爆破的冲炮;⑤采用砂包墙埂作飞石防护屏障,既彻底阻挡了飞石,又屏蔽了爆破声响。最终爆破效果相当完美。
Based on the directional blasting in demolition of a chimney and water tower built in thin reinforced concrete some key technological measures were put forward for the safety and success in directional blasting. These measures include： ①cutting down the blasting incision central angle to 208°; ②tilting steel brace sustain at the center of rear strutting section, resulting in an enhancement in resistance force to chimney both fall down and recoil; ③adopting the cut in “〈” shape for the angle of direction windows, so as to the ends of direction windows suffer stress more short blast-holes; ④ using wall blasting splashing stones and bl evenly; ⑤using fast-setting cement as stemming to avoid effectively burst out of built in sand-bags as defense against blasting splashing stones to obstruct both asting sound. The blasting was very wonderful through using these measures.
出处
《工程爆破》
2005年第4期42-45,共4页
Engineering Blasting
关键词
定向爆破
拆除
烟囱
水塔
定向窗
Directional blasting
Demolition
Chimney
Water tower
Directional window
