复杂环境下大型砖结构水塔定向爆破拆除

利用定向爆破技术成功拆除临街复杂环境中的一座砖结构水塔。精确确定倾倒方向,采用较低的切口位置、较小的切口长度、较窄的切口高度、合理的正梯形切口形式,以及密集炮孔、少量装药、对称分段毫秒延时起爆方式,精心组织施工、加强安全防护。爆后水塔按设计的方向倒塌,周围的建筑物没有受到任何损坏,拆除爆破达到了预期目的。

BLASTING DEMOLITION OF REINFORCED CONCRETE FOUNDATION IN HIGH TEMPERATURE

The demolition of the reinforced concrete foundation of blast furnace by controlled blasting was introduced.Regarding the high temperature(80¹00℃),many technical measures were taken such as compulsorily reducing temperature and isolating charge from heat.The permitted time of charging,tamping and wiring were defined by simulating test of heat-enduring to charge in the borehole.In order to ensure safety,the time that the charge stayed in the borehole was reduced.In the case of blasting demolition of thicker and bigger foundation,airdeck charging construction and wider spacing were taken.The blasting gained ideal effect.