CN112443274A - Construction method of coal bunker cable hole - Google Patents

Abstract

The invention discloses a construction method of a coal bunker cable hole, which comprises the first step of vertically constructing a drill hole with the diameter of 28-32mm from bottom to top at the designed position of a coal bunker lower opening cable hole by using an anchor rod machine as a guide hole; secondly, pulling out the drill rod after the drill hole penetrates to the upper opening of the waste bin, and installing a hole expanding drill bit with the diameter of 73mm for expanding the hole; and thirdly, pre-burying a steel pipe with the diameter of 50mm in the hole after reaming is finished, and performing pipe fixing operation, wherein the construction of the cable hole is finished after the pipe is fixed. The cable hole machining method is simple to operate, the complex process of using a raise boring machine to open holes underground is omitted, the construction efficiency is improved, and the construction cost is effectively reduced.

Description

Construction method of coal bunker cable hole

Technical Field

The invention relates to the technical field of underground coal mine construction, in particular to a construction method of a coal bunker cable hole.

Background

The conventional construction method needs to use a raise boring machine, so that the operation is inconvenient and the construction cost is high.

Disclosure of Invention

The invention aims to provide a construction method of a coal bunker cable hole suitable for underground, and the construction cost can be effectively reduced by adopting the method to construct the cable hole.

The technical scheme adopted by the invention is as follows:

a construction method of a coal bunker cable hole comprises the following steps:

firstly, vertically constructing a drill hole with the diameter of 28-32mm from bottom to top at the designed position of a cable hole at the lower opening of a coal bunker by using an anchor rod machine as a guide hole;

secondly, pulling out the drill rod after the drill hole penetrates to the upper opening of the waste bin, and installing a hole expanding drill bit with the diameter of 73mm for expanding the hole;

and thirdly, pre-burying a steel pipe with the diameter of 50mm in the hole after reaming is finished, and performing pipe fixing operation, wherein the construction of the cable hole is finished after the pipe is fixed.

Further, the operation of pipe fixing is to use a block to block the bottom of the hole enlargement, and cement slurry is poured into a gap between the steel pipe and the hole enlargement.

Further, the wall thickness of the steel pipe is 2 mm.

The invention has the following beneficial effects: the construction method of the cable hole is simple to operate, the complex process of using a raise boring machine to construct and drill the hole underground is omitted, the construction efficiency is improved, and the construction cost is effectively reduced.

Drawings

FIG. 1 is a schematic view of the present invention during punching;

FIG. 2 is a schematic structural view of the steel pipe of the present invention after installation;

in the figure: 1-coal bunker, 2-roadway, 3-guide hole, 4-reaming, 5-cable hole, 6-rock mass, 7-steel pipe and 8-cement slurry.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

The invention relates to a construction method of a coal bunker cable hole, which is applied to the construction of the cable hole under a coal mine or in a similar scene, and comprises the following steps:

firstly, as shown in figure 1, arock mass 6 between anupper roadway 2 and alower roadway 2 of a coal bunker 1 is vertically drilled with a bolting machine from bottom to top to form a drill hole with the diameter of 28-32mm as aguide hole 3;

secondly, pulling out a drill rod after theguide hole 3 penetrates into the upperopening roadway 2 of the waste bin, and installing a hole expanding drill bit with the diameter of 73mm for expandingholes 4;

thirdly, as shown in fig. 2, after the hole expansion is finished, asteel pipe 7 with the diameter of 50mm and the wall thickness of 2mm is pre-buried in the hole, the bottom of the hole expansion is blocked by a blocking block,cement slurry 8 is poured into a gap between thesteel pipe 7 and thehole expansion 4 to carry out the pipe fixing operation, and after the pipe is fixed, the construction of thecable hole 5 is finished.

The method is simple to operate, the complex process of using the raise boring machine to construct and drill holes underground is omitted, the construction efficiency is improved, and the construction cost is effectively reduced.

Claims (3)

1. A construction method of a coal bunker cable hole is characterized by comprising the following steps:

firstly, vertically constructing a drill hole with the diameter of 28-32mm from bottom to top at the designed position of a cable hole at the lower opening of a coal bunker by using an anchor rod machine as a guide hole;

secondly, pulling out the drill rod after the drill hole penetrates to the upper opening of the waste bin, and installing a hole expanding drill bit with the diameter of 73mm for expanding the hole;

and thirdly, pre-burying a steel pipe with the diameter of 50mm in the hole after reaming is finished, and performing pipe fixing operation, wherein the construction of the cable hole is finished after the pipe is fixed.

2. The construction method of the coal bunker cable hole according to claim 1, characterized in that: and the pipe fixing operation is to plug the bottom of the reaming hole by adopting a plug block and pour cement slurry into a gap between the steel pipe and the reaming hole.

3. The construction method of the coal bunker cable hole according to claim 1, characterized in that: the wall thickness of the steel pipe is 2 mm.

Images