Weakly cemented stratum coal mine gas extraction branch pipe anti-blocking hole dredging pipeline

Abstract

This utility model discloses a gas drainage branch pipe anti-blocking and unblocking pipeline in weakly cemented coal mines, relating to the field of safe production in weakly cemented coal mines. This pipeline includes an independent borehole unblocking pipe and a tubular connecting device built into a sealing pipe and a screen pipe. The tubular connecting device connects the unblocking pipe to the external environment. The borehole unblocking pipe components include the unblocking pipe and the unblocking pipe interface. The borehole unblocking pipe is composed of a screen pipe, a sealing bag, a PVC hose, and a metal connector. Different diameters and lengths of hose can be selected according to drilling requirements. The metal connector has annular indentations to ensure a tight seal. The connecting device consists of three parts: a connecting pipe, a probe, and a ball valve. This device is quick and easy to install and can monitor the borehole flow rate and compare the gas concentration inside and outside the borehole during operation, analyzing whether the borehole leakage is due to leakage, blockage, or natural attenuation, in order to take targeted preventative measures.

Description

Technical Field

[0001] This utility model relates to the field of coal mine safety production and is a pipeline for preventing blockage and clearing blockage holes in gas extraction branch pipes of coal mines in weakly cemented strata. Background Technology

[0002] Gas drainage boreholes in the construction area are an effective measure in the comprehensive gas outburst prevention strategy. The pre-drainage effect of the drainage boreholes directly determines the outburst prevention effect of the coal seam. Although the boreholes now adopt processes such as full-length screen pipe installation, the large range of coal body creep after hydraulic flushing, especially in soft coal seams with weak cementation, causes the coal body to creep and peel off after drilling, accumulating at the coal-rock interface under gravity. Due to negative pressure, some coal dust is sucked into the screen pipe, causing the screen pipe to become porous or blocked, isolating the borehole coal body from the outside world and preventing effective gas drainage. This results in some boreholes showing abnormally low concentrations and almost zero flow rates shortly after construction, seriously affecting the gas drainage effect and leaving safety hazards for subsequent mining activities. Summary of the Invention

[0003] To solve the above technical problems, this utility model provides a gas extraction branch pipe anti-blockage hole dredging pipeline in weakly cemented strata coal mines. The pipeline components are lightweight and easy to construct, facilitating underground transportation and construction.

[0004] To achieve the above objectives, this utility model provides the following solution: a dredging and unblocking pipeline for gas extraction branch pipes in weakly cemented coal mines. This structure includes a borehole dredging pipe and a tubular connecting device. The connecting device connects the borehole dredging pipe to external environmental monitoring. The borehole dredging pipe device involves laying another dredging pipe inside the sealing pipe and screen pipe to the bottom of the borehole. During daily use, the gas concentration and negative pressure inside the borehole can be measured through this dredging pipe. If any abnormality is detected, the dredging pipe can be connected to an air supply pipe to supply air to the bottom of the borehole. Compressed air is used to dredge the inside of the screen pipe and the perforations in the screen pipe, ensuring the unobstructed flow of the extraction channel. The borehole dredging pipe component includes a dredging pipe and a dredging pipe interface. The borehole dredging pipe is composed of a screen pipe, a sealing bag, a PVC hose, and a metal connector. Hose of different diameters and lengths can be selected according to the drilling requirements. The metal connector has annular indentations to ensure a tight seal.

[0005] Furthermore, the aforementioned drilling and unblocking pipe is a PVC flexible hose that meets industrial production standards. (The thickness and length of the hose can be determined according to the inner diameter of the drilling screen pipe and actual needs).

[0006] Furthermore, the tubular connection device is assembled into a single unit, consisting of a dredging pipe interface, a probe nozzle, and a ball valve. One end of the dredging pipe interface is connected to the borehole dredging pipe, and the other end is connected to the external environment. It can also be connected to monitoring equipment for monitoring purposes.

[0007] Furthermore, the gas extraction branch pipe anti-blockage and unblocking pipeline consists of a borehole unblocking pipe and a tubular connecting device. The borehole unblocking pipe is connected to the unblocking pipe interface of the tubular connecting device, and a ball valve is used to regulate the unblocking pipeline for gas extraction or gas concentration monitoring. During operation, the borehole flow rate and gas concentration inside and outside the borehole are compared using the measuring nozzle of the connecting device to analyze whether the borehole leakage is due to leakage, blockage, or natural decay, allowing for targeted preventative measures. High-concentration independent extraction can also be performed through this channel, achieving multiple uses for a single pipe.

[0008] Because the present invention adopts the above-mentioned technical solution, this device has the advantages and effects of convenient material sourcing, simple assembly, high efficiency, safety and economy. Attached Figure Description

[0009] To more clearly illustrate the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0010] Figure 1 A schematic diagram illustrating the installation and use of the drilling and unblocking pipe provided by this utility model; Figure 2 This is a schematic diagram of the overall structure of the drilling and unblocking pipe provided by this utility model; Figure 3 A schematic diagram of the tubular connecting device provided by this utility model; Figure 4 This is a cross-sectional schematic diagram of the tubular connecting device provided by this utility model.

[0011] Explanation of reference numerals in the attached drawings: 1-Drilling and unblocking pipe; 2-Tube-shaped connecting device; 1A-Drilling pipe screen pipe; 1B-Drilling pipe sealing bag; 1C-Unblocking pipe interface; 2A-Unblocking pipe probe of connecting device; 2B-Valve of connecting device; 2C-Pressure air inlet of connecting device. Detailed Implementation

[0012] To enhance understanding of the present invention, the following description, in conjunction with embodiments and accompanying drawings of underground mining tunnels in weakly cemented strata, further illustrates the invention. These embodiments are for illustrative purposes only and do not constitute a limitation on the scope of protection of the present invention.

[0013] like Figure 1 The diagram shown illustrates the installation and use of the borehole clearing pipe provided by this utility model. This utility model's gas drainage branch pipe anti-blocking and clearing pipeline in weakly cemented strata coal mines includes a borehole clearing pipe 1 and a tubular connecting device 2. Construction units can select different sizes of borehole clearing pipes 1 based on the specific roadway construction specifications and safety production requirements, by varying the location and diameter of the gas drainage boreholes in the weakly cemented strata coal mine roadways; simultaneously, different diameter connecting devices 2 can be selected according to safety production and pipe diameter requirements.

[0014] like Figure 2 The diagram shows the overall structure of the borehole clearing pipe provided by this utility model. The borehole clearing pipe 1 is installed inside the gas extraction borehole pipeline, with its front end extending to the bottom of the borehole. The original anti-clogging structure of the borehole pipeline: the borehole pipeline screen pipe 1A and the borehole pipeline sealing bag 1B still function normally and do not damage the original borehole structure. The diameter of the borehole clearing pipe 1 should be slightly smaller than the diameter of the borehole pipeline screen pipe 1A to ensure that the clearing pipe can be smoothly lowered into the borehole, while maintaining sufficient annular space for gas flow; the rear end of the borehole clearing pipe 1 is connected to the tubular connecting device 2 through the clearing pipe interface 1C.

[0015] like Figure 3 The diagram shows the structure of the tubular connecting device provided by this utility model. The tubular connecting device 2 is assembled into a single unit, consisting of a dredging pipe interface 1C, a dredging pipe probe 2A, a connecting device valve 2B (ball valve), and a connecting device pressure air inlet 2C. The length and diameter of this device can be purchased or customized according to actual production needs. The tubular device and the dredging pipe interface 1C should be slightly smaller than the inner diameter of the drilled dredging pipe 1, allowing the end of the drilled dredging pipe 1 to be smoothly inserted into the tubular device interface and ensuring its airtightness. One end of the tubular connecting device 2 is connected to the drilled dredging pipe 1, and the other end is connected to the external environment. Extracted gas is discharged and collected through the end port of the tubular connecting device 2 and controlled by the connecting device valve 2B.

[0016] like Figure 4 The diagram shown is a cross-sectional view of the tubular connecting device provided by this utility model. The tubular connecting device 2 internally includes an interconnected unblocking pipe interface 1C, a connecting device unblocking pipe probe 2A, a connecting device valve 2B, and a connecting device pressure air inlet 2C. The end of the novel drilling unblocking pipe 1 is inserted into the interface of the tubular connecting device 2. The gas concentration and the negative pressure at the bottom of the drilling pipeline are monitored through the connecting device unblocking pipe probe 2A. If abnormal negative pressure or gas concentration is detected at the bottom of the borehole, air can be introduced and pressurized through the pressure air inlet 2C to ensure safe and smooth gas extraction.

[0017] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been described above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed content to create equivalent embodiments without departing from the technical solution of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A method for clearing blockages in gas extraction branch pipes of weakly cemented formations, characterized in that... This pipeline includes a sealing pipe and a screen pipe with an independent drilling and unblocking pipe built inside, as well as a tubular connecting device. The tubular connecting device is used to connect the unblocking pipe to the external environment. The drilling and unblocking pipe component includes the unblocking pipe and the unblocking pipe interface. The drilling and unblocking pipe is composed of a screen pipe, a sealing bag, a PVC hose, and a metal connector. Different diameters and lengths of hoses can be selected according to drilling requirements. The metal connector has annular indentations to ensure a tight connection. The connecting device consists of three parts: a connecting pipe, a probe, and a ball valve.

2. The anti-blocking and unblocking pipeline for gas extraction branch pipes in weakly cemented formations according to claim 1, characterized in that, The drilling and unblocking pipe is built inside the drilling screen pipe.

3. The gas extraction branch pipe hole unblocking pipeline for preventing hole blocking in a weakly cemented stratum according to claim 2, characterized in that, The steel mesh support structure can be fabricated according to the size of the borehole screen pipe.

4. The anti-blocking and unblocking pipeline for gas extraction branch pipes in weakly cemented formations according to claim 1, characterized in that, The connecting device can be made by welding steel pipes or by integrating plastic components.

5. The anti-blocking and unblocking pipeline for gas extraction branch pipes in weakly cemented formations according to claim 1, characterized in that, The connecting device contains a dredging pipe interface, a measuring nozzle, and a ball valve. After being connected to the borehole dredging pipe, the gas concentration and negative pressure inside the borehole can be monitored through the dredging pipe during daily use. If there is any abnormality, the dredging pipe can be connected to the air supply pipe to supply air to the bottom of the borehole. The compressed air can be used to dredge the inside of the screen pipe and the holes in the screen pipe to ensure the smooth flow of the extraction channel.

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