A mining three-plug three-injection sealing device

Abstract

This utility model discloses a three-plug, three-injection sealing device for coal seam gas depressurization and extraction technology, comprising an outer bag, a middle bag, an inner bag, and a gas hole. The outer bag, middle bag, and inner bag are disposed inside the gas hole. A rear sealing section is provided between the outer bag and the middle bag, and a front sealing section is provided between the middle bag and the inner bag. A grouting pipe is disposed on the outer bag, with its right end passing through the middle bag and the inner bag. A grouting pipe is disposed in the middle of the outer bag, with its right end passing through the middle bag. A grouting pipe is disposed at the lower part of the outer bag, with its right end extending into the rear sealing section. An extraction pipe is disposed on the upper part of the outer bag. The multiple-section sealing and grouting reduces the risk of slurry loss and improves the reliability of the sealing. The filter tail filters the slurry in the middle section, filtering out the water in the slurry and leaving solid expansion material, thus preventing slurry leakage during the grouting process.

Description

Technical Field

[0001] This utility model relates to the field of coal seam gas depressurization and extraction technology, specifically a mine-use three-plug three-injection sealing device. Background Technology

[0002] Drilling is a crucial step in coal mining operations, and after drilling, the borehole needs to be sealed before proceeding to the next step. Sealing is vital not only for mine safety but also for the safety of workers; therefore, the effectiveness of sealing is paramount in coal mine drilling. Current mining technology employs a "two-plug-one-injection" method, a pressurized sealing technique. This method involves first sealing both ends of the borehole section with sluice bags, then injecting grout into the section between the two sealed sections via an injection pipe. This method effectively fills the cracks around the borehole and improves gas extraction efficiency. However, in the area near the outer sealing section, the fractures are more severe and widespread, making it difficult for the grout to flow away along the larger fractures during injection, hindering complete sealing. Furthermore, the sluice bags, after expanding during grouting, cannot completely seal the gap between themselves and the extraction pipe, causing "grout leakage" when injecting grout into the section between the two sealed sections, leading to pressure relief and sealing failure.

[0003] Therefore, we propose a three-plug, three-injection sealing device for mining. Utility Model Content

[0004] The purpose of this utility model is to provide a three-plug, three-injection sealing device for mining, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mining three-plug three-injection sealing device, comprising an outer bag, a middle bag, an inner bag, and a gas hole, wherein the outer bag, the middle bag, and the inner bag are disposed inside the gas hole, a rear sealing section is provided between the outer bag and the middle bag, and a front sealing section is provided between the middle bag and the inner bag; Grouting pipe one, grouting pipe one is set on the outer bag, and the right end of grouting pipe one passes through the middle bag and the inner bag; Grouting pipe two is located in the middle of the outer bladder, and the right end of grouting pipe two passes through the middle bladder. Grouting pipe three is located at the lower part of the outer bladder, and the right end of grouting pipe three extends into the rear sealing section. An extraction tube is installed at the upper part of the outer bag; A one-way valve is installed on the grouting pipe three; The rupture valve is located in the right half of the grouting pipe. A quick-connect structure is provided on the grouting pipe.

[0006] Preferably, a gap is left between the extraction tube and the outer bag.

[0007] Preferably, the outer bag, middle bag, and inner bag are all provided with filter tails.

[0008] Preferably, the grouting pipe passes through the interior of the middle and inner pouches, and grouting holes are opened inside the pouches.

[0009] Preferably, the grouting pipe passes through the inside of the outer bladder and has an grouting hole at its location.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: Grouting pipe one passes through the inner and outer bladder bags, and grouting holes are opened inside them. The one-way valve prevents backflow after grouting is completed inside the inner and outer bladder bags, thus preventing a decrease in the expansion pressure of the inner and outer bladder bags. Grouting pipe two passes through the inner bladder bag, and its function is to inject grout into the front sealing section after the inner and outer bladder bags have expanded, completing the sealing of the front sealing section. Grouting pipe three passes through the outer bladder bag, and grouting holes are opened inside it. The one-way valve prevents backflow after grouting is completed inside the outer bladder bag, thus preventing a decrease in the expansion pressure of the outer bladder bag. The grouting pipe has three ends that extend into the rear sealing section, and a burst valve is installed at the rear sealing section. The burst pressure of the burst valve is the same as the expansion pressure of the outer bladder. When the outer bladder completes grouting expansion and reaches the design pressure, the burst valve bursts and grouting begins into the rear sealing section. After grouting is completed, the entire sealing operation is finished. The three sealing bladders and three grouting pipes form segmented sealing and grouting. Through multi-segment sealing and grouting, the risk of grout loss is reduced and the reliability of sealing is improved. The filter tail filters the grout in the middle section, filtering out the water in the grout and leaving solid expansion material to avoid grout leakage during the grouting process. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the bag installation structure of this utility model; Figure 3 This is a schematic diagram of the filter tail installation structure of this utility model.

[0012] In the diagram: 1. Outer bag; 2. Middle bag; 3. Inner bag; 4. Grouting pipe one; 5. Grouting pipe two; 6. Grouting pipe three; 7. Extraction pipe; 8. Check valve; 9. Bursting valve; 10. Gap; 11. Rear sealing section; 12. Gas hole; 13. Front sealing section; 14. Quick-connect structure. 1-1. Filter tail; Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1-3 This utility model provides a technical solution: a mining three-plug three-injection sealing device, including an outer bag 1, a middle bag 2, an inner bag 3, and a gas hole 12. The outer bag 1, middle bag 2, and inner bag 3 are disposed inside the gas hole 12. A rear sealing section 11 is provided between the outer bag 1 and the middle bag 2, and a front sealing section 13 is provided between the middle bag 2 and the inner bag 3. A first grouting pipe 4 is disposed on the outer bag 1, and the right end of the first grouting pipe 4 passes through the middle bag 2 and the inner bag 3. A second grouting pipe 5 is disposed in the middle of the outer bag 1, and the right end of the second grouting pipe 5 passes through the middle bag 2. A third grouting pipe 6 is disposed at the lower part of the outer bag 1, and the right end of the third grouting pipe 6 extends into the rear sealing section 11. An extraction pipe 7 is disposed at the upper part of the outer bag 1. A one-way valve 8 is disposed on the third grouting pipe 6. A rupture valve 9 is disposed on the right half of the third grouting pipe 6. A quick-insertion structure 14 is disposed on the first grouting pipe 4. Grouting pipe 1 4 passes through the interior of the middle bag 2 and the inner bag 3, and a grouting hole is opened inside it. A one-way valve 8 is installed on the hole. The function of the one-way valve 8 is to prevent backflow after grouting is completed inside the middle bag 2 and the inner bag 3, which would cause the expansion pressure of the middle bag 2 and the inner bag 3 to decrease. Grouting pipe 2 5 passes through the interior of the inner bag 2. Its function is to inject grout into the front sealing section 13 after the middle bag 2 and the inner bag 3 have expanded due to grouting, thereby completing the sealing of the front sealing section 13. The quick-connect structure 14 can be quickly installed and disassembled to adjust the length of the front sealing section 13 to meet the actual needs of coal seam sealing. Grouting pipe 36 passes through the inside of the outer bladder 1 and has a grouting hole inside it. A one-way valve (number 8) is installed on the hole. The function of one-way valve 8 is to prevent backflow after grouting inside the outer bladder 1, which would cause the expansion pressure of the outer bladder 1 to decrease. The front end of grouting pipe 36 extends into the rear sealing section 11, and a burst valve 9 is installed at the rear sealing section 11. The burst pressure of burst valve 9 is the same as the expansion pressure of outer bladder 1. When the grouting expansion of outer bladder 1 reaches the design pressure, burst valve 9 bursts and grouting begins into the rear sealing section 11. After grouting is completed, the entire sealing operation is completed.

[0015] Reference embodiment: A gap 10 is left between the extraction pipe 7 and the outer bag 1. The outer bag (1), the middle bag 2, and the inner bag 3 are all equipped with filter tails 1-1. The right side of the filter tail is integrated with the inside of the outer bag 1 of the sealing device, and its inside is connected to the internal channel of the sealing device. It is used to pass through the extraction pipe 7 and the grouting pipe 2 5. After installation, the right side of the filter tail 1-1 is tied to the extraction pipe 7. During the grouting of the middle section, a gap 10 is unavoidable. The function of the filter tail 1-1 is to filter the slurry in the middle section, filter the water in the slurry and leave solid expansion material, so as to avoid slurry leakage during the grouting process.

[0016] Reference embodiment: Grouting pipe 4 passes through the interior of the middle bag 2 and the inner bag 3, and grouting holes are opened at their interior positions; grouting pipe 6 passes through the interior of the outer bag 1, and grouting holes are opened at its position.

[0017] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mining three-plug three-injection sealing device, characterized in that, It includes an outer pouch (1), a middle pouch (2), an inner pouch (3), and a gas hole (12). The outer pouch (1), the middle pouch (2), and the inner pouch (3) are disposed inside the gas hole (12). A rear sealing section (11) is provided between the outer pouch (1) and the middle pouch (2), and a front sealing section (13) is provided between the middle pouch (2) and the inner pouch (3). Grouting pipe 1 (4) is installed on the outer bag (1), and the right end of the grouting pipe 1 (4) passes through the middle bag (2) and the inner bag (3). Grouting pipe two (5) is located in the middle of the outer bag (1), and the right end of the grouting pipe two (5) passes through the middle bag (2). Grouting pipe three (6) is located at the lower part of the outer bag (1), and the right end of the grouting pipe three (6) extends into the rear sealing section (11); Extraction tube (7) is located on the upper part of the outer bag (1); One-way valve (8) is provided on the grouting pipe three (6); A burst valve (9) is provided on the right half of the grouting pipe (6); Quick-connect structure (14) is provided on the grouting pipe (4).

2. The mining three-plug three-injection sealing device according to claim 1, characterized in that: A gap (10) is left between the extraction tube (7) and the outer bag (1).

3. A mining three-plug three-injection sealing device according to claim 1, characterized in that: The outer bag (1), middle bag (2), and inner bag (3) are all equipped with filter tails (1-1).

4. A mining three-plug three-injection sealing device according to claim 1, characterized in that: The grouting pipe (4) passes through the interior of the middle bag (2) and the inner bag (3), and grouting holes are opened inside it.

5. A mining three-plug three-injection sealing device according to claim 1, characterized in that: The grouting pipe (6) passes through the inside of the outer bag (1) and has a grouting hole at its location.

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