A method for burying a pipe in a goaf of a coal mining face

Abstract

The application discloses a kind of buried pipe methods of goaf in mining face, belong to coal mining technical field, can solve the problem of buried pipe extraction in upper corner of crossheading roadway in down hill of mining face, water accumulation in pipeline, cause extraction resistance, poor extraction effect, goaf gas cannot be effectively controlled, the upper corner gas can be controlled by the pipeline into the cutting line before the pipeline is disconnected, and the extraction is continued, and the upper corner can be extracted.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining, and in particular relates to a pipe burying method in a goaf area of ​​a mining face. Background Art

[0002] The lower coal mining face primarily relies on a temporary drainage pumping station in the second panel area for gas extraction. When the lower coal mining face's drift roadway is being excavated for the downhill tunnel, water accumulates in the pipes at the upper corner during gas extraction, reducing the effectiveness of gas extraction from the goaf. Gas concentrations in the upper corner remain at a critical 0.5% for a long time, significantly reducing the effectiveness of gas control measures at the mining face. Summary of the Invention

[0003] The present invention provides a method for burying pipes in the goaf of a mining face to address the problems of water accumulation in the pipes during pipe burial for extraction in the upper corners of the downhill drift tunnel of the mining face, which causes large extraction resistance, poor extraction effect, and ineffective control of gas in the goaf.

[0004] The present invention adopts the following technical solutions:

[0005] A method for burying pipes in a goaf area of ​​a mining face comprises the following steps:

[0006] The first step is to disconnect the two sets of screens closest to the upper corner before the pipeline enters the cutting line;

[0007] The second step is to install a pipe spool at one end of the disconnected screen tube and block the other end. One end of the spool is connected to the second set of screen tubes from the upper corner using an iron pipe, and the other end of the spool is connected to the third set of screen tubes from the upper corner using an iron pipe and a snake skin pipe.

[0008] The third step is to cut the eyeline and push it to the second set of screen pipes from the upper corner, disconnect the iron pipe connected to the second set of screen pipes from the upper corner and add a plug to the iron pipe, and use the pipe connected to the third set of screen pipes from the upper corner to pump out the goaf;

[0009] The fourth step is that when the cutting top line is pushed to the third set of screen pipes from the upper corner, the iron pipe connected to the third set of screen pipes from the upper corner is disconnected and a plug is added to the serpentine pipe. At this time, the second set of screen pipes from the upper corner has entered the goaf 20m, which can play the role of goaf pumping. The pumping pipeline inside the second set of screen pipes from the upper corner is completely disconnected, solving the problem of water accumulation in the pipeline on pumping.

[0010] Furthermore, the diameter of the iron pipe is 108 mm.

[0011] Furthermore, the diameter of the serpentine tube is 108 mm.

[0012] The beneficial effects of the present invention are as follows:

[0013] The present invention drains the pipeline through pipeline modification to ensure the extraction of gas from the goaf by the buried pipe in the upper corner, thereby achieving the purpose of draining the pipeline, reducing the pipeline extraction resistance, increasing the extraction volume of the goaf, and improving the gas control effect.

[0014] By modifying the pipeline, when the pipeline with serious water supply is disconnected before the pipeline enters the cutting line, continuous pumping and discharge can be achieved in the broken pipe, and the upper corner can be pumped and discharged to achieve controllable gas in the upper corner. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the pipe laying method of the present invention;

[0016] Figure 2 This is a schematic diagram of the original pipeline buried layout;

[0017] Among them: 1-the first group of sieve tubes from the upper corner; 2-the second group of sieve tubes from the upper corner; 3-the third group of sieve tubes from the upper corner; 4-iron pipe; 5-four-way. DETAILED DESCRIPTION

[0018] The present invention will be further described with reference to the accompanying drawings.

[0019] As shown in the figure, based on the influence of the extraction pipeline, water discharger and negative pressure, and comprehensively considering the working principle under the extraction operation state, the effects of draining water, reducing resistance, increasing extraction volume and controlling gas are achieved through pipeline modification, reconnection, changing the working principle, etc.

[0020] like Figure 2 The specific method is as follows:

[0021] (1) Before the pipeline enters the cutting line, disconnect the two sets of screen pipes closest to the upper corner and add a new pipeline spool. Use a φ108 iron pipe at one end to connect to the second set of screen pipes from the upper corner. Use a φ108 iron pipe and a φ108 serpentine pipe at the other end to connect to the third set of screen pipes from the upper corner.

[0022] (2) When the cut line is pushed to the second set of screen pipes from the upper corner, disconnect the φ108 iron pipe connected to the second set of screen pipes from the upper corner and add a plug to the iron pipe. Use the pipe connected to the third set of screen pipes from the upper corner to pump out the goaf.

[0023] (3) When the top cut line reaches the third set of screen pipes from the upper corner, disconnect the φ108 iron pipe connected to the third set of screen pipes from the upper corner and add a plug to the serpentine pipe. At this point, the second set of screen pipes from the upper corner has entered the goaf about 20m and can play a role in goaf drainage. The drainage pipeline inside the second set of screen pipes from the upper corner is completely disconnected, eliminating the impact of water accumulation in the pipeline on drainage.

[0024] The comparison of the upper corner pipeline pumping volume and the negative pressure of the temporary pumping station before and after the renovation is shown in the following table.

[0025]

[0026] From the comparison of the above data, it can be seen that before the pipe was broken, the pipeline was affected by the water in the pipeline, the pipeline pumping volume was 45m³ / min, the temporary pump station negative pressure was 28Kpa, and the gas in the upper corner was about 0.5%; after the pipe was broken, the pipeline with serious water accumulation was discarded, and the pumping volume was 76.34m³ / min.

[0027] By modifying the pipeline, when the pipeline with serious water supply is disconnected before the pipeline enters the cutting line, continuous pumping and discharge can be achieved in the broken pipe, and the upper corner can be pumped and discharged to achieve controllable gas in the upper corner.

Claims

1. A method for burying pipes in a goaf of a mining face, characterized by: The steps include: The first step is to disconnect the two sets of screens closest to the upper corner before the pipeline enters the cutting line; The second step is to install a pipe spool at one end of the disconnected screen tube and block the other end. One end of the spool is connected to the second set of screen tubes from the upper corner using an iron pipe, and the other end of the spool is connected to the third set of screen tubes from the upper corner using an iron pipe and a snake skin pipe. The third step is to cut the eyeline and push it to the second set of screen pipes from the upper corner, disconnect the iron pipe connected to the second set of screen pipes from the upper corner and add a plug to the iron pipe, and use the pipe connected to the third set of screen pipes from the upper corner to pump out the goaf; The fourth step is that when the cutting top line is pushed to the third set of screen pipes from the upper corner, the iron pipe connected to the third set of screen pipes from the upper corner is disconnected and a plug is added to the serpentine pipe. At this time, the second set of screen pipes from the upper corner has entered the goaf 20m, which can play the role of goaf pumping. The pumping pipeline inside the second set of screen pipes from the upper corner is completely disconnected, solving the problem of water accumulation in the pipeline on pumping.

2. A pipe burying method in a goaf of a mining face according to claim 1, characterized in that: The diameter of the iron pipe is 108 mm.

3. The pipe embedding method in a goaf of a mining face according to claim 1, characterized in that: The diameter of the serpentine tube is 108 mm.

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