A self-drilling injection anchor
pipe anchoring device and method for
coal mines, comprising an anchor
pipe, a disposable
drill bit, a tray, a nut, an anchor A material grouting
assembly, an anchor B material grouting
assembly and a
slurry mixing tee joint, wherein the disposable
drill bit is coaxially installed at the front end of the anchor
pipe, the disposable
drill bit and the anchor pipe are inserted into the borehole, the rear end of the anchor pipe extends out of the borehole, the tray is sleeved on the anchor pipe, the nut is threadedly connected to the rear end of the anchor pipe, the rear end of the nut is crimped with the front end of the tray, a front-to-back transparent grouting center channel is opened inside the disposable
drill bit and the anchor pipe, the outlet end of the
slurry mixing tee joint is connected to the rear port of the anchor pipe, and the two inlet ends of the
slurry mixing tee joint are respectively connected to the outlets of the anchor A material grouting
assembly and the anchor B material grouting assembly. The invention has simple process, flexible operation, high construction efficiency, saves the process of drilling and withdrawing the drill rod, is convenient for conveying the anchoring agent, and the resin ring formed after the anchoring agent is injected has uniform thickness and good anchoring effect.