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在北方地区冻土开挖时,采取爆破方法比人工刨土可提高工效2.5倍,降低工程造价50％。冻土爆破既能缩短工期,又能提高经济效益,因此在条件允许的情况下,应优先采用。现就冻土爆破施工方法作如下介绍,仅供参考。 1、爆破孔的布置爆破孔间间距为1.3倍的冻土深度,孔间排距为最小抵抗线(炸药包中心至地面的最小距离)的1.5倍,孔径为30～50毫米,孔深为冻土厚度的0.7～0.8倍。爆破孔交错布置,孔与地面垂直。 2、钻孔爆破孔可用大锤和钢钎打成,也可用风钻钻孔。
In the northern region of frozen soil excavation, blasting method to take more than 2.5 times the efficiency of artificial earthwork, reduce construction costs by 50%. Frozen soil blasting can shorten the construction period, but also improve economic efficiency, so the conditions permitting, should be given priority. Now on the construction method of permafrost for the following introduction, for reference purposes only. 1, the layout of the blasting hole blasting hole spacing of 1.3 times the depth of frozen soil, spacing between holes for the minimum resistance line (the center of the cartridge to the ground minimum distance) of 1.5 times the diameter of 30 to 50 mm hole depth Frozen soil thickness of 0.7 to 0.8 times. Burst holes are staggered, with holes perpendicular to the ground. 2, drilling blast hole can be sledgehammer and drill drill, can also be used to drill holes.