Device and method for improving roadway base plate anchor rod anchor cable pore-forming efficiency and anchoring performance

Abstract

The invention discloses a device and a method for improving pore-forming efficiency and anchoring performance of a roadway base plate anchor rod anchor cable. The device comprises a special drill rod, a connecting rod and a rod taking device. The special drill rod is successively utilized to perform twice drilling operations and reserved in a hole after the operations of the special drill rod are finished, then a common drill rod is inserted into the inner cavity of the special drill rod to continue to perform drilling till the designed depth is reached, the common drill rod is taken out, an anchoring agent is placed into the hole, an anchor rod or the anchor cable is installed, and finally the special drill rod is taken out through the rod taking device. When the device and the method are adopted to perform drilling and installation of the anchor rod or the anchor cable, the special drill rod is always reserved in the hole so that hole collapse can be effectively prevented. The smooth mud return of an anchor rod anchor cable drilling machine is ensured in the drilling process, water in mud is prevented from entering a loose fractured rock mass at the shallow portion of a base plate, accordingly rock soil is prevented from depositing at the drilling bottom, and borer clamping is avoided. The device for improving the pore-forming efficiency and the anchoring performance of the roadway base plate anchor rod anchor cable is simple in structure and convenient to use, the drilling rate reaches to 100%, the anchoring effects of the anchor rod and the anchor cable are good, the borer clamping is effectively prevented in the drilling process, and the construction efficiency is improved remarkably.

Description

technical field [0001] The invention relates to the fields of mining engineering and geotechnical engineering, in particular to a device and a method for improving the hole-forming efficiency and anchoring performance of anchor rods and cables on the bottom plate of coal mine roadways. Background technique [0002] Floor heaving is a common dynamic phenomenon in high-stress soft rock roadways, and floor anchor net cable support is often impossible to implement due to the difficulty of construction and low construction efficiency. At present, floor anchor rods and anchor cables in coal mines and geotechnical engineering mainly use floor anchor cable drilling rigs and ordinary drill pipes for construction. There are mainly three problems in the construction: (1) The surrounding rock is loose and broken within a depth of about 1m from the floor of the roadway, and it will be drilled through quickly when drilling, but after the drill pipe is pulled out, the borehole will quickly...

AI Technical Summary

Problems solved by technology

[0003] Technical problem to be solved: Aiming at the deficiencies in the prior art, the present invention provides a device and method for improving the hole-forming efficiency and anchoring performance of the roadway floor anchor rod and anchor cable, and solves the problem of using ordinary drill pipes in the prior art. There are technical problems such as difficulty in forming holes, easy clamping and poor anchoring effect

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