Method for drilling anchor rod hole and anchoring anchor rod in broken roof

Abstract

The invention provides a method for drilling an anchor rod hole and anchoring an anchor rod in a broken roof. The method includes the following steps that (1) the depth of a drill hole and the length of the anchor rod are determined according to supporting parameters of the anchor rod of broken surrounding rocks, and then two hollow tubular drill rods are connected according to the depth of the drill hole, or a connecting rod is arranged between the threaded ends of the two drill rods in a connected mode to form a combination drill rod; (2) the end, provided with a square inner buckle, of one drill rod is connected with a drill bit in a sleeved mode, and the end, provided with a square inner buckle, of the other drill rod is connected to a drill rig for drilling; (3) the drill rig is dismantled, the drill rods are exposed, and then a cement cartridge is sent to the bottom of a drill rod center hole through the anchor rod; (4) the anchor is pushed into the cement cartridge through the drill rig, the drill rod connected with the drill bit in the sleeved mode is withdrawn, and after 20-30 minutes, an arch supporting plate and a spherical nut are mounted at the end, extending out of the surrounding rocks, of the anchor rod. According to the method, the drill rods and the connecting rod are of a hollow tubular structure, and protective holes of the drill rods and the connecting rod avoid a hole collapse before anchoring the anchor rod; the cement cartridge is used as an anchoring agent, so that the anchoring is prevented from loosing efficacy.

Description

technical field [0001] The invention relates to a method for drilling a bolt hole in a broken roof and a method for anchoring the bolt. Background technique [0002] With the increase of coal mine mining depth, the roadways of some mines present the characteristics of large deformation, large range of surrounding rock loose circles, and broken roadway surrounding rocks, making roadway maintenance difficult; in addition, in extremely close-distance coal seam mining and layer mining, other The roof of the mining roadway is relatively broken, and the use of bolt support in the broken surrounding rock often encounters borehole collapse and resin anchorage failure. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention provides a method for drilling bolt holes and anchor bolts in broken roofs, which can avoid borehole collapse and prevent anchorage failure. [0004] The technical scheme adopted in the present inventio...

AI Technical Summary

Problems solved by technology

[0002] With the increase of coal mine mining depth, the roadways of some mines present the characteristics of large deformation, large range of surrounding rock loose circles, and broken roadway surrounding rocks, making roadway maintenance difficult; The roof of the mining roadway is relatively broken, and the use of bolt support in the broken surrounding rock often encounters the phenomenon of borehole collapse and resin anchorage failure

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