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在煤矿井下,煤仓等筒状结构物常用的开掘方法为钻井法,由于其存在耗水大、搬家难、施工速度慢、安全程度低等缺陷,钻井法施工筒状结构物含有较大难度。超深孔分段或一次爆破成井技术是施工筒状结构物的新技术,虽然不存在上述问题,但是爆破技术仍需完善。本文立足改善掏槽形式,基于“裂槽、抛渣”爆破思想,设计了含抛渣孔的新型菱形掏槽方式;提出了合理分段高度、炮孔间距、起爆时差等爆破参数选取方法。在杨村煤矿十采区煤仓,在必须保证施工过程不影响下部巷道持续通风的特殊条件下,设计了超深孔分段成井爆破方案和管道通风方案。爆破成井后,壁面规整、块度适中,达到了省工、省料和安全施工的目的。
In the coal mine, the commonly used digging method for the tubular structures such as coal bunkers is the drilling method. Because of its large water consumption, difficult moving, slow construction speed and low safety level, the tubular structure with the drilling method is difficult . Ultra-deep hole section or a blasting well technology is a new technology for construction of tubular structures, although there is no above problem, but the blasting technology still needs improvement. Based on the idea of improving the undercutting mode, a new type of diamond undercutting mode based on the idea of “fissuring and throwing slag ” was designed, and the selection of blasting parameters such as reasonable segment height, method. In Yangcun coal mine ten mining coal storage, in the need to ensure that the construction process does not affect the continuous ventilation of the lower roadway under the special conditions, the design of ultra-deep hole section into the well blasting program and pipeline ventilation program. After blasting into a well, the wall is neat and the blockiness is moderate, which achieves the purpose of saving labor, saving materials and constructing safely.