Anti-sloughing hole device and construction method of anti-sloughing hole

Abstract

The invention discloses an anti-collapse hole device and a construction method for an anti-collapse hole. The anti-collapse hole device includes a hollow pipe, a drill tooth and a connector, the front end of the hollow pipe is fixedly connected to the drill tooth, and the rear end of the hollow pipe is equipped with a connector A through hole through the hollow pipe is opened at a distance of 150-200mm from the connection head on the hollow pipe; the anti-slump hole construction method includes the following steps: 1. Install the drilling rig bracket and the anchor cable rig; 2. Install a solid drill pipe On the anchor cable drilling rig, start the anchor cable drilling rig for construction drilling; 3. Take out the anchor cable drilling rig and the solid drill pipe, install the anti-slump hole device on the anchor cable drilling rig and perform secondary drilling; 4. Repeat steps 3 and 2 alternately Step 4: Use a solid drill pipe to drill a hole, and then use an anti-slump hole device for secondary drilling until the designed hole depth is drilled; 5. Clean the hole and install the anchor cable, anchor rod and grouting pipe. The anti-collapse hole device of the invention has reasonable design, simple structure, long service life, simple construction steps and good anti-collapse effect.

Description

technical field [0001] The invention relates to the technical field of coal mine construction, in particular to an anti-collapse hole device and a construction method for an anti-collapse hole. Background technique [0002] Bolt support is the main method of coal seam roadway support, which can significantly improve the stress state of the surrounding rock of the roadway, improve the support effect, reduce the support cost, reduce the labor burden of workers, and provide an effective guarantee for coal safety production. In order to strengthen the support strength in the lower parking lot of some coal mines, secondary support will be carried out for the roadway. During the secondary support, anchor rods and anchor cables are required to be installed on the bottom plate. In the technical process of anchor cable drilling, when drilling It is one of the key processes, and some existing pneumatic hammer and bolter drilling rigs cannot be used for drilling. This kind of drilling ...

AI Technical Summary

Problems solved by technology

In order to strengthen the support strength in the lower parking lot of some coal mines, secondary support will be carried out for the roadway. During the secondary support, anchor rods and anchor cables are required to be installed on the bottom plate. In the technical process of anchor cable drilling, when drilling It is one of the key processes, and some existing pneumatic hammer and bolter drilling rigs cannot be used for drilling. This kind of drilling method is prone to hole collapse on the top layer of some roadways with poor plasticity and high water content. After the hole, it brings difficulties to the construction, and the following processes such as anchor cable and grouting

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