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为敷设管线开挖堑沟时,由于在3米表土层以下存在按苏联建筑工程法规分类的Ⅹ-Ⅺ级硬岩层,且在敷设管线的附近有建筑物和构筑物,从而使开挖工作复杂化。为了松动7.5米厚的硬岩层,决定对表土层以下硬岩层采用深孔爆破法。对上部表土层用挖掘机挖掘后,用潜孔钻机钻凿深2.5米的孔,用阿莫尼特№ 6ЖB炸药和延发电雷管爆破。敷设好的爆破线路用土壤覆盖,这样,爆破后覆盖土壤臌起,不会产生岩块飞
In excavation of trenches for laying pipelines, the excavation is complicated by the presence of X-Ⅺ grade hard rock formations classified under the Soviet Union Building Code below the 3 m topsoil and buildings and structures in the vicinity of the laying pipeline . In order to loosen the hard rock layer 7.5m thick, it is decided to adopt the deep hole blasting method for the following hard rock layers in the topsoil. After digging the upper surface soil with an excavator, drill a hole of 2.5 meters in depth using a downhole drilling rig, and detonate with Armonet № 6ЖB explosive and detonation detonator. Laying a good blasting line with soil cover, so that after blasting cover the soil 臌 起, will not produce rock fly