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一、概述 反井钻进技术始于六十年代,它广泛应用于煤矿、水电、市政等通风井、排水井、电缆井、充填井、溜煤眼的反井施工中,可钻直径0.6m～6.4m,可钻深度从lOOm到900余m。目前,世界各地在使用的反井钻机已有不同型号的计三百多台,平均月成井速度达100～150m/月。 反井钻进法施工就是先由上水平巷道向下钻凿一先导孔,与下水平巷道贯通后,在下水平拆去先导钻头,然后安装扩孔钻头,由下向上扩孔。(见附图)
First, an overview Anti-shaft drilling technology began in the sixties, it is widely used in coal mines, utilities, municipal ventilation shafts, drainage wells, cable wells, filling wells, coal mining wells anti-shaft construction, drilling diameter 0.6m ~ 6.4m, drilling depth from lOOm to 900 m. At present, anti-shaft drilling rigs used around the world have more than 300 sets of models of different types with an average monthly formation rate of 100-150 m / month. Raise-well drilling construction method is to drill a pilot hole downward from the upper horizontal roadway, and after the horizontal tunnel passes through, the pilot drill bit is removed horizontally and then the reaming drill bit is installed, and the hole is expanded upward from below. (see Attachment)