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在水工建筑物基坑和边坡的大方量开挖中,需要放大炮进行爆破。为了防止大爆破震坏边坡,过去一般是采用予留保护区的办法,在保护区以外进行大炮爆破,在保护区以内采用小炮爆破。这样做不仅打防震孔工程量大,而且效果不好。近年,国内大型工地积极采用予裂爆破新技术。所谓予裂爆破,就是先沿着设计开挖边线打一排钻孔,孔内分段或连续装上少量炸药,起爆以后,就能够沿着各钻孔连线产生一条裂缝,接着就可以放大炮进行开挖岩
In the hydraulic excavation of foundation pit and slope, you need to enlarge the gun for blasting. In order to prevent the detonation of large slopes, it is generally used to reserve reservoirs for protection, to blast the cannon outside the reserve and to use the blasting within the reserve. Doing so not only shockproof hole engineering quantity, and the effect is not good. In recent years, large-scale construction sites in China have actively adopted the new technology of pre-cracking blasting. The so-called pre-split blasting, that is, first along the design and excavation of the edge of a row of drilling holes, holes or continuous installation of a small amount of explosives, after detonation, you can along the drilling connection to produce a crack, and then you can put Cannon excavation rock