金华山煤矿大口径瓦斯抽排孔施工技术

Construction Technology of Large Diameter Gas Discharging Hole in Jinhuashan Coal Mine

摘要:

为了减少煤矿瓦斯的危害以及对其综合利用，国家鼓励并大力支持大口径瓦斯抽排孔项目的建设。陕西铜川金华山煤矿一口大口径瓦斯抽排孔，孔径850 mm，终孔深度401.6 m。从钻进方法、钻具级配、钻进技术参数、冲洗液、圆孔、溜孔、井底护管安装固结、充填循环泥浆、下管、固管、透孔放水等方面详细地介绍了大口径瓦斯抽排孔小径透巷后的特殊施工工艺和相关的技术措施。

Abstract:

In order to reduce the harm of coal mine gas and realize comprehensive utilization, the large diameter gas hole project is encouraged and supported in China. This paper shows a large diameter gas hole with diameter of 850mm and termination depth of 401.6m and in detail introduces the special construction technologies after small diameter hole drilling through the tunnel and related technical measures in drilling methods, drilling tool grading, drilling technical parameters, flushing fluid, borehole rolling and straightening, protection casing installation and consolidation at hole bottom, circulating mud filling, pipe lowering and fixing and hole construction for drainage.