A device for strengthening the stability of a borehole wall in soft coal seams

Abstract

The utility model relates to the technical field of coal mining, especially relates to a soft coal seam drilling hole wall stability reinforcing device, including the drill rod installation head, the outer surface of drill rod installation head is provided with the first outer thread, the rear end of drill rod installation head is fixedly connected with the guide assembly, the outer surface front part of guide assembly is fixedly sleeved with the grouting assembly, the outer surface middle part of guide assembly is movably sleeved with the support reinforcing assembly. The utility model discloses a soft coal seam drilling hole wall stability reinforcing device, through inflatable rubber support ring inflation, makes it swell and lets the embedding convex head embeds the hole wall, and the pre-support is formed quickly, and then the slurry is injected into the guide sleeve, and the slurry flows out from the annular array distribution slurry outlet hole and penetrates the coal seam fracture, and the inflatable rubber support ring and the solidified slurry jointly reinforce the hole wall, greatly improve the hole wall stability and the anti-deformation ability, guarantee the safety of soft coal seam drilling operation.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, and in particular to a device for strengthening the stability of the borehole wall in soft coal seams. Background Technology

[0002] In coal mining operations, drilling into soft coal seams is a crucial step in ensuring mining safety and efficiency, and is widely used in scenarios such as gas drainage, geological exploration, and roadway advance detection. Gas drainage involves drilling deep into the coal seam to extract gas using negative pressure, reducing gas concentration and preventing explosions. Geological exploration boreholes are used to obtain core data such as the thickness, morphology, and fracture development of soft coal seams, providing a basis for mining plan design. Roadway advance detection boreholes can detect faults, water inrushes, and other potential hazards ahead of the coal seam in advance, preventing safety accidents during roadway excavation.

[0003] However, soft coal seams have a loose structure, low mechanical strength, and numerous natural fractures. During drilling, drill rod disturbance and changes in coal seam stress can easily lead to borehole wall collapse and deformation, resulting in low safety during drilling operations in soft coal seams. Therefore, we have developed a device to enhance borehole wall stability in soft coal seams. Utility Model Content

[0004] The main purpose of this invention is to provide a device for strengthening the stability of borehole walls in soft coal seams, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A device for enhancing the stability of borehole walls in soft coal seams includes a drill rod mounting head. The outer surface of the drill rod mounting head is provided with a first external thread. A guide component is fixedly connected to the rear end of the drill rod mounting head. A grouting component is fixedly sleeved on the front of the outer surface of the guide component. A support and reinforcement component is movably sleeved on the middle of the outer surface of the guide component.

[0007] Preferably, the support reinforcement component includes positioning protrusion rings and expandable rubber support rings. Four positioning protrusion rings and two expandable rubber support rings are provided, arranged front to back. The outer surfaces of the two expandable rubber support rings each have several embedded protrusions. A first inflation hose is interlocked and fixedly connected between the two expandable rubber support rings. A second inflation hose is interlocked and fixedly connected to the front end of the front expandable rubber support ring. A connecting pipe is interlocked and fixedly connected to the end of the second inflation hose away from the expandable rubber support ring. A switch valve is movably installed on the outer surface of the connecting pipe. An inflation head is interlocked and fixedly connected to the end of the connecting pipe away from the second inflation hose.

[0008] By adopting the above technical solution: four positioning protrusions can limit the two expandable rubber support rings to prevent them from shifting. The expandable rubber support rings are inflated through the inflation head, connecting pipe and hose, so that they expand and fit against the hole wall. The protrusions are embedded to enhance the engagement with the hole wall, form a stable support and improve the hole wall's resistance to collapse.

[0009] Preferably, the guiding assembly includes a guide sleeve, a guide head is fixedly connected to the rear end of the guide sleeve, a grouting port with internal and external penetration is opened on the front of the outer surface of the guide sleeve, a plurality of grouting outlet holes with internal and external penetration are opened in the middle of the outer surface of the guide sleeve, and the front end of the guide sleeve is fixedly connected to the rear end of the drill rod mounting head.

[0010] By adopting the above technical solution: the guide head facilitates the smooth drilling of the guide sleeve into the borehole, reducing resistance; the guide sleeve provides a channel for grouting; the grouting port supplies grout to enter; and the grouting outlet supplies grout to flow out of the permeation hole wall.

[0011] Preferably, the rear part of the guide head is provided with rounded corners, and a plurality of the slurry outlet holes are distributed in a circular array around the center of the guide sleeve.

[0012] By adopting the above technical solution: the rounded edge of the rear of the guide head reduces the scratch damage to the borehole wall during drilling, protects the initial structure of the borehole wall, and the grout outlet is distributed in a ring array, so that the grout flows out evenly from multiple directions, ensuring that the coal seam fractures around the borehole wall are fully filled by the grout, and improving the uniformity of grouting reinforcement.

[0013] Preferably, the grouting assembly includes a fixed pipe and a connecting block. The upper part of the outer surface of the fixed pipe is provided with a second external thread, the inner wall surface of the connecting block is provided with an internal thread, the upper edge of the connecting block is fixedly connected to a grouting pipe, a sealing plug is movably sleeved inside the grouting pipe, and the fixed pipe is fixedly sleeved inside the grouting port.

[0014] By adopting the above technical solution, the sealing plug can block the grouting pipe when grouting is not in progress, preventing debris from entering and clogging the channel, and ensuring the sealing and practicality of the grouting component.

[0015] Preferably, the second external thread and the internal thread are adapted to each other, and the internal thread is threadedly connected to the fixed pipe through the second external thread and the connecting block.

[0016] By adopting the above technical solution, the second external thread is matched with the internal thread, so that the connecting block is firmly connected to the fixed pipe thread, which facilitates the disassembly and maintenance of the grouting component, and at the same time ensures that the grout will not leak from the connection gap during the grouting process, thereby improving the grouting sealing performance and operation convenience.

[0017] Preferably, the four positioning protrusion rings are fixedly sleeved on the outer surface of the guide sleeve, the two expandable rubber support rings are respectively movably sleeved between the corresponding two positioning protrusion rings, and the plurality of embedded protrusions are respectively connected to the interior of the corresponding expandable rubber support rings.

[0018] By adopting the above technical solution: the positioning protrusion ring is fixed on the guide sleeve to provide stable positioning for the expandable rubber support ring, preventing the support ring from shifting during inflation or drilling. The embedded protrusion head communicates with the inside of the support ring and expands synchronously during inflation, enhancing the interlocking strength between the support ring and the hole wall, and further improving the support stability.

[0019] Preferably, all of the slurry outlet holes are located between two expandable rubber support rings.

[0020] By adopting the above technical solution, the slurry is concentrated in the area defined by the expandable rubber support ring, thus preventing the slurry from flowing to both ends of the borehole.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] In use, the two expandable rubber support rings of the support and reinforcement component are first placed between the positioning protrusions of the guide sleeve of the guide component. Then, the drill rod is connected to the first external thread of the drill rod mounting head, driving the guide sleeve to drill into the borehole. Subsequently, air is injected into the expandable rubber support ring through the air inflator, connecting pipe, first air inflator hose, and second air inflator hose, causing it to expand and allowing the embedded protrusion to embed into the borehole wall, quickly forming a pre-support. Next, the sealing plug in the grouting pipe of the grouting component is removed, and grout is injected into the guide sleeve through the grouting pipe, connecting block, fixing pipe, and grouting port. The grout flows out from the grout outlet holes distributed in a ring array and permeates the coal seam fractures. Finally, a small amount of gas in the expandable rubber support ring is released and the guide sleeve is removed, leaving the expandable rubber support ring and the solidified grout to reinforce the borehole wall together. The entire device greatly improves the stability and deformation resistance of the borehole wall, ensuring the safety of drilling operations in soft coal seams. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a device for enhancing the stability of drilling borehole walls in soft coal seams according to this utility model.

[0024] Figure 2 This is a cross-sectional view of the structure of a device for enhancing the stability of borehole walls in soft coal seams according to this utility model (the drill rod mounting head, guide assembly, and grouting assembly are shown in the cross-section).

[0025] Figure 3 This is a schematic diagram of the guiding component of a drilling hole wall stability enhancement device for soft coal seams according to the present invention;

[0026] Figure 4 This is an exploded view of the grouting component of a drilling hole wall stability enhancement device for soft coal seams according to this utility model.

[0027] Figure 5 This is a schematic diagram of the supporting and reinforcing component of a drilling hole wall stability enhancement device for soft coal seams according to this utility model;

[0028] Figure 6 This utility model relates to a device for enhancing the stability of borehole walls in soft coal seams. Figure 5 Enlarged view of the structure at point A in the image.

[0029] In the diagram: 1. Drill rod mounting head; 2. First external thread; 3. Guide assembly; 4. Grouting assembly; 5. Support and reinforcement assembly; 31. Guide sleeve; 32. Guide head; 33. Grouting port; 34. Grout outlet; 41. Fixing pipe; 42. Connecting block; 43. Second external thread; 44. Internal thread; 45. Grouting pipe; 46. Sealing plug; 51. Positioning protrusion ring; 52. Expandable rubber support ring; 53. Embedded protrusion head; 54. First inflation hose; 55. Second inflation hose; 56. Connecting pipe; 57. Switch valve; 58. Inflation head. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0031] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Please see Figure 1-6This utility model provides a technical solution:

[0034] A device for enhancing the stability of borehole walls in soft coal seams includes a drill rod mounting head 1, with a first external thread 2 on the outer surface of the drill rod mounting head 1, a guide component 3 fixedly connected to the rear end of the drill rod mounting head 1, a grouting component 4 fixedly sleeved on the front of the outer surface of the guide component 3, and a support and reinforcement component 5 movably sleeved on the middle of the outer surface of the guide component 3.

[0035] In this embodiment, the support reinforcement component 5 includes positioning protrusion rings 51 and expandable rubber support rings 52. Four positioning protrusion rings 51 and two expandable rubber support rings 52 are provided. The four positioning protrusion rings 51 and the two expandable rubber support rings 52 are distributed front to back. Several embedded protrusions 53 are provided on the outer surface of each of the two expandable rubber support rings 52. A first inflation hose 54 is inserted and fixedly connected between the two expandable rubber support rings 52. A second inflation hose 54 is inserted and fixedly connected to the front end of the front expandable rubber support ring 52. The second air hose 55 has a connecting pipe 56 fixedly connected to one end of it away from the expandable rubber support ring 52. A switch valve 57 is movably installed on the outer surface of the connecting pipe 56. An air inflator 58 is fixedly connected to the other end of the connecting pipe 56 away from the second air hose 55. The guide assembly 3 includes a guide sleeve 31, with a guide head 32 fixedly connected to the rear end of the guide sleeve 31. The front of the outer surface of the guide sleeve 31 has an internally and externally penetrating grouting port 33, and the middle of the outer surface of the guide sleeve 31 has several internally and externally penetrating grouting ports. The grout outlet 34 and the front end of the guide sleeve 31 are fixedly connected to the rear end of the drill rod mounting head 1; the rear part of the guide head 32 is set with a rounded edge, and several grout outlets 34 are distributed in a ring array around the center of the guide sleeve 31; the grouting assembly 4 includes a fixed pipe 41 and a connecting block 42, the upper part of the outer surface of the fixed pipe 41 is provided with a second external thread 43, the inner wall surface of the connecting block 42 is provided with an internal thread 44, the upper edge of the connecting block 42 is fixedly connected to a grouting pipe 45, a sealing plug 46 is movably sleeved inside the grouting pipe 45, and the fixed pipe 41 is fixedly sleeved on the connecting block 42. The grouting port 33 is inside; the second external thread 43 and the internal thread 44 are matched, and the internal thread 44 is threadedly connected to the fixed pipe 41 through the second external thread 43 and the connecting block 42; four positioning protrusion rings 51 are fixedly sleeved on the outer surface of the guide sleeve 31, two expandable rubber support rings 52 are respectively movably sleeved between the corresponding two positioning protrusion rings 51, and several embedded protrusions 53 are respectively connected to the interior of the corresponding expandable rubber support rings 52; several grout outlet holes 34 are all set at the position between two expandable rubber support rings 52.

[0036] It should be noted that this utility model is a device for strengthening the stability of the borehole wall in soft coal seams. In use, firstly, the two expandable rubber support rings 52 in the support and strengthening component 5 are respectively movably sleeved between the two corresponding positioning protrusions 51 on the outer surface of the guide sleeve 31 in the guide component 3. Next, the drill rod is threadedly connected to the first external thread 2 on the outer surface of the drill rod mounting head 1. The drill rod applies force, causing the drill rod mounting head 1 and the guide component 3 fixedly connected to its rear end to move synchronously, drilling the guide sleeve 31 in the guide component 3 into the borehole of the soft coal seam, allowing the guide sleeve 31 to smoothly reach the specified depth of the borehole. At this time, the two expandable rubber support rings 52 also... The guide sleeve 31 is inserted into the borehole. The grouting assembly 4, connecting pipe 56, switch valve 57, and air inlet 58 on the outer surface of the guide sleeve 31 are all located outside the borehole. Then, the air inlet of the external air inlet device is connected to the air inlet 58 at the end of the connecting pipe 56 away from the second air inlet hose 55. The switch valve 57 is slowly rotated to open. The gas generated by the external air inlet device enters the connecting pipe 56 through the air inlet 58, and then flows into the front expandable rubber support ring 52 through the second air inlet hose 55. At the same time, the gas is diverted to the rear expandable rubber support ring 52 through the first air inlet hose 54. As the gas is inlet, the two expandable rubber support rings 52 gradually expand, and their outer surfaces... Several embedded protrusions 53 on the surface extend as they communicate with the interior of the expandable rubber support ring 52, until the outer surface of the expandable rubber support ring 52 is tightly fitted against the borehole wall. The embedded protrusions 53 are embedded in the coal seam of the borehole wall. Then, the switch valve 57 is closed, disconnecting the external air-filling equipment from the air-filling head 58, completing the borehole wall support. After that, the sealing plug 46 inside the grouting pipe 45 in the grouting assembly 4 is removed, the grout outlet end of the external grouting equipment is fitted into the grouting pipe 45, and the external grouting equipment is started. The reinforcing grout enters the guide sleeve 31 through the grouting pipe 45, connecting block 42, fixing pipe 41 and grouting port 33 in sequence, and then enters the guide sleeve 31 from the middle of the outer surface of the guide sleeve 31 at two expandable... Grout flows out from several outlet holes 34 between the expandable rubber support rings 52 and evenly penetrates into the coal seam fissures in the borehole wall. After the grout is fully filled, the external grouting equipment is stopped, and the borehole wall grouting reinforcement is completed. Finally, after the reinforcement grout has initially set, the switch valve 57 on the connecting pipe 56 is opened to release a small amount of gas in the two expandable rubber support rings 52, so that there is a gap between the expandable rubber support rings 52 and the guide sleeve 31. Then, the drill rod is rotated in the opposite direction, which drives the drill rod mounting head 1 and the guide assembly 3 to move synchronously, and the guide sleeve 31 is slowly removed from the two expandable rubber support rings 52. The expandable rubber support rings 52 left in the borehole and the solidified grout together maintain the stability of the borehole wall.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for enhancing the stability of borehole walls in soft coal seams, comprising a drill rod mounting head (1), characterized in that: The outer surface of the drill rod mounting head (1) is provided with a first external thread (2), the rear end of the drill rod mounting head (1) is fixedly connected to a guide component (3), the front of the outer surface of the guide component (3) is fixedly sleeved with a grouting component (4), and the middle of the outer surface of the guide component (3) is movably sleeved with a support and reinforcement component (5). The support reinforcement component (5) includes positioning protrusion rings (51) and expandable rubber support rings (52). There are four positioning protrusion rings (51) and two expandable rubber support rings (52). The four positioning protrusion rings (51) and the two expandable rubber support rings (52) are distributed front and back. The outer surface of the two expandable rubber support rings (52) is provided with several embedded protrusions (53). The two expandable rubber support rings (52) are connected together by a first inflation hose (54). The front end of the front expandable rubber support ring (52) is connected to a second inflation hose (55). The end of the second inflation hose (55) away from the expandable rubber support ring (52) is connected to a connecting pipe (56). A switch valve (57) is movably installed on the outer surface of the connecting pipe (56). The end of the connecting pipe (56) away from the second inflation hose (55) is connected to an inflation head (58).

2. The device for enhancing the stability of borehole walls in soft coal seams according to claim 1, characterized in that: The guide assembly (3) includes a guide sleeve (31), a guide head (32) is fixedly connected to the rear end of the guide sleeve (31), a grouting port (33) with internal and external penetration is opened on the front of the outer surface of the guide sleeve (31), a plurality of grouting holes (34) with internal and external penetration are opened in the middle of the outer surface of the guide sleeve (31), and the front end of the guide sleeve (31) is fixedly connected to the rear end of the drill rod mounting head (1).

3. The device for enhancing the stability of borehole walls in soft coal seams according to claim 2, characterized in that: The rear part of the guide head (32) is set with rounded corners, and a number of the slurry outlet holes (34) are distributed in a circular array around the center of the guide sleeve (31).

4. The device for enhancing the stability of borehole walls in soft coal seams according to claim 2, characterized in that: The grouting assembly (4) includes a fixed pipe (41) and a connecting block (42). The upper part of the outer surface of the fixed pipe (41) is provided with a second external thread (43). The inner wall surface of the connecting block (42) is provided with an internal thread (44). A grouting pipe (45) is fixedly connected to the upper edge of the connecting block (42). A sealing plug (46) is movably sleeved inside the grouting pipe (45). The fixed pipe (41) is fixedly sleeved inside the grouting port (33).

5. The device for enhancing the stability of borehole walls in soft coal seams according to claim 4, characterized in that: The second external thread (43) and the internal thread (44) are adapted to each other, and the internal thread (44) is threadedly connected to the fixed pipe (41) through the second external thread (43) and the connecting block (42).

6. The device for enhancing the stability of borehole walls in soft coal seams according to claim 1, characterized in that: The four positioning protrusions (51) are fixedly sleeved on the outer surface of the guide sleeve (31), and the two expandable rubber support rings (52) are respectively movably sleeved between the corresponding two positioning protrusions (51). The several embedded protrusions (53) are respectively connected to the interior of the corresponding expandable rubber support rings (52).

7. The device for enhancing the stability of borehole walls in soft coal seams according to claim 2, characterized in that: Several of the slurry outlet holes (34) are located between two expandable rubber support rings (52).

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