一九八七年四月,我们单位承担了承德市某厂旧厂房拆除爆破工程,先后爆破四次,拆除旧建筑四座。当进行第三次爆破时,由于事先已准备的有关器材和电雷管不足,为不影响工期,便决定在炮孔比较集中且同段起爆的炮孔中采用了双根导爆索连接,毫秒电雷管引爆的方案。共爆炮孔598个,炸药总量20.32kg。合闸后一声巨响,距爆破点30～42m处的广房和办公楼面向爆点一侧的门窗玻璃60％被损坏,并有个别5cm左右的小砖块飞出距离大于30m,造 In April 1987, our company undertook the demolition blasting project of the old factory building of a factory in Chengde City. It demolished four times and demolished four old buildings. When the third blasting was carried out, due to the lack of related equipment and electric detonators prepared in advance, it was decided to adopt a double root detonating cord connection in the blasting hole where the blasting hole was relatively concentrated and the blasting started in the same millisecond Electric detonator detonated program. A total of 598 blasting holes, explosives total 20.32kg. After closing a loud noise, from the blast point 30 ~ 42m Department of Canton room and office building explosion on the side of the glass doors and windows were damaged 60%, and some individual small pieces of about 5cm flying out distance greater than 30m, made