非电半秒延期雷管在特小洞室开挖施工中的应用

Application of Non-Electric Half-Second Delayed Detonator in Excavation Construction of Extra Small Cavern

以非电半秒延期雷管分段延期起爆在缙云抽水蓄能电站引水中平洞排水廊道的施工为例,特小洞室中使用非电半秒延期雷管分段延期起爆,方法为孔内采用分段,孔外采用“一把抓”连接,起爆为HS1雷管,在雷管内装入连接在起爆网路上的延期装置,实现延期的时间间隔通过不同时差构成的爆破网络。克服了在特小洞室中使用毫秒雷管起爆的不利条件,不仅能保证开挖质量,又能加快施工进度,节约施工成本。

Taking Jinyun Pumped Storage Power Station as an example,non-electric half-second delay detonator is used in extra-small chamber to delay the initiation in stages.The method is to adopt segments in the hole and a grab connection outside the hole.The HS1 detonator is detonated by installing a delay device connected to the initiation network in the detonator to realize the blasting network with different time differences.This method overcomes the disadvantageous conditions of using millisecond detonator to initiate explosion in extra-small chamber,not only guarantees the excavation quality,but also speeds up the construction progress and saves the construction cost.