Combined drilling tool for rapid grouting and hole sealing in underground coal mine

Abstract

The utility model relates to the technical field of coal mine drilling, and discloses a coal mine underground quick grouting and hole sealing combined drilling tool which comprises a drilling rod, a drilling rod head is arranged at the right end of the drilling rod, and a nut is connected to the outer wall of the drilling rod head in a threaded and sleeved mode. Through feeding and rotation of the drill rod, the teeth at the bottom of the floral tube which is long enough abut against the bottom of a drill hole, friction force is increased, the floral tube keeps stable and does not rotate when the drill rod rotates, and further after the drill rod rotates for a certain time, the threaded barrel fiercely moves towards the interior of the floral tube and extrudes the capsule to enable the capsule to expand, so that the floral tube is prevented from rotating. The gap between the periphery of the drill rod and the wall of the drill hole is sealed, compared with a traditional device, the device conducts positioning and sealing on the portion, needing to be grouted, of the bottom of the drill hole, cement paste and chemical paste can be rapidly and fully injected into the positioned crack needing to be grouted in a pressed mode, and the problem of grout leakage or uneven filling is avoided.

Description

Technical Field

[0001] This utility model relates to the field of coal mine drilling technology, and more specifically, to a combination drilling tool for rapid grouting and sealing in underground coal mines. Background Technology

[0002] The main purpose of underground drilling in coal mines is to obtain more accurate underground geological information and resource distribution, including understanding the underground rock structure, geological structure and coal seam occurrence state. Through drilling, key information such as the lithology of the rock strata in front of the underground tunneling head, the condition of confined water, the thickness of the coal seam and the development of the structure can be determined, providing a scientific basis for safe production and efficient mining in coal mines.

[0003] When drilling in coal mines, ground fissures or fracture zones are often encountered. Since the fissures are weak areas in the underground rock strata, when the drill bit passes through these areas, it can easily cause the rocks around the borehole to become unstable, making the rock strata more susceptible to damage from external forces. Furthermore, if the drill bit continues to advance into the fissure area, the pore pressure around the well wall may change due to factors such as the increased degree of rock fracturing and changes in drilling fluid permeability pressure, which in turn can increase the formation collapse pressure and ultimately lead to borehole collapse.

[0004] Currently, in order to successfully penetrate ground fissures, cement grout is usually injected to fill the fissures. The fluidity and solidification of the cement grout fill and seal the fissures, thereby restoring the safety and stability of drilling operations. However, in actual grouting operations, the large voids inside the borehole cause the cement grout to accumulate at the bottom of the borehole. At this time, the cement grout does not have enough pressure to fill the fissures, resulting in poor grouting efficiency. Therefore, it is necessary to improve and optimize this method. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a combination drill bit for rapid grouting and sealing in coal mines, which has the advantage of rapid sealing and grouting.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a combined drilling tool for rapid grouting and sealing in coal mines, including a drill rod, a drill rod head at the right end of the drill rod, a nut threaded onto the outer wall of the drill rod head, the nut and the drill rod head being locked and fixed, and a connecting pipe threaded onto the right side of the nut;

[0007] The outer wall of the connecting pipe is provided with a capsule, a threaded cylinder is fixedly installed on the right side of the connecting pipe, a perforated tube is threaded onto the right side of the threaded cylinder, teeth are fixedly installed on the right side wall of the perforated tube, and a grouting pipe is provided inside the threaded cylinder.

[0008] As a preferred technical solution of this utility model, the outer wall of the perforated tube is provided with holes for grouting, and the teeth can abut against the bottom of the drilled hole to increase friction.

[0009] As a preferred embodiment of this utility model, the left outer wall of the threaded cylinder is smooth, the right side of the threaded cylinder is threaded, and the length of the smooth outer wall of the threaded cylinder is greater than the length of the connection between the flower tube and the threaded cylinder.

[0010] In a preferred embodiment of this utility model, the nut and the perforated tube are positioned correspondingly, and the inner diameter of the right side of the nut and the inner diameter of the left side of the perforated tube are the same.

[0011] As a preferred technical solution of this utility model, one end of the grouting pipe extends through the drill rod to the outside of the hole for conveying chemical grout.

[0012] In a preferred embodiment of this invention, the drill rod, connecting pipe, threaded cylinder, and perforated pipe are interconnected, and the drill rod is used to transport cement slurry.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This invention utilizes the feeding and rotation of the drill rod to ensure that the teeth at the bottom of a sufficiently long perforated tube abut against the bottom of the borehole, increasing friction and allowing the perforated tube to remain stable and non-rotating while the drill rod rotates. Furthermore, after the drill rod has rotated for a certain period, the threaded cylinder moves sharply into the perforated tube, compressing the capsule and causing it to expand, thus sealing the gap between the drill rod's outer perimeter and the borehole wall. Compared to traditional devices, this device provides a positioning seal above the grouting area at the bottom of the borehole, allowing cement grout and chemical grout to be quickly and fully injected into the positioned cracks requiring grouting. This avoids grout leakage or uneven filling, effectively improving grouting quality and efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic cross-sectional view of the present invention.

[0017] Figure 3 This is a schematic diagram of the structure of the drill bit, nut, and connecting pipe of this utility model when disassembled;

[0018] Figure 4 This is a schematic diagram of the capsule structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the grouting pipe structure of this utility model.

[0020] In the diagram: 1. Drill rod; 2. Nut; 3. Drill rod head; 4. Connecting pipe; 5. Capsule; 6. Threaded cylinder; 7. Perforated pipe; 8. Tooth; 9. Grouting pipe. Detailed Implementation

[0021] 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.

[0022] like Figures 1 to 5 As shown, this utility model provides a combination drill bit for rapid grouting and sealing in coal mines, including a drill rod 1, a drill head 3 at the right end of the drill rod 1, a nut 2 threadedly connected to the outer wall of the drill head 3, the nut 2 and the drill head 3 locked and fixed, and a connecting pipe 4 threadedly connected to the right side of the nut 2.

[0023] The outer wall of the connecting pipe 4 is provided with a capsule 5, the right side of the connecting pipe 4 is fixedly installed with a threaded cylinder 6, the right side of the threaded cylinder 6 is threaded with a perforated pipe 7, the right side wall of the perforated pipe 7 is fixedly installed with teeth 8, and the inside of the threaded cylinder 6 is provided with a grouting pipe 9.

[0024] During drilling, if a ground fissure is encountered, the workers first assemble the device. First, they tighten the drill head 3 at the right end of drill rod 1 and the nut 2. Then, they tighten the nut 2 and the connecting pipe 4. Next, they thread the threaded cylinder 6 and the perforated pipe 7 together, ensuring that the threaded cylinder 6 is not completely inserted into the perforated pipe 7. At this point, the workers can use the drilling equipment to insert the device into the borehole. When the perforated pipe 7 reaches the bottom of the borehole, the drilling equipment applies a downward force to it, causing the teeth 8 at the right end of the perforated pipe 7 to abut against the bottom of the hole. Then, drill rod 1 begins to rotate. As drill rod 1 rotates, it drives the connecting pipe 4 and the threaded cylinder 6 to rotate. The rotation of the threaded cylinder 6 causes it to move along the perforated pipe 7, which is threaded with it, towards the bottom of the hole. It is worth noting that because the teeth 8 abut against the bottom of the hole, the friction between the perforated pipe 7 and the bottom of the hole increases. Furthermore, as the threaded cylinder 6 rotates, the perforated pipe... Pipe 7 will not rotate, ensuring that threaded cylinder 6 smoothly enters the interior of perforated pipe 7. As threaded cylinder 6 continues to rotate, when the threaded end on the right side of threaded cylinder 6 is fully inside perforated pipe 7, the connection between perforated pipe 7 and threaded cylinder 6 will lose its threaded fixation. At this time, the downward force applied by drill rod 1 will cause threaded cylinder 6 to move sharply into perforated pipe 7. Further, the left end of perforated pipe 7 will slide on the smooth outer wall on the left side of threaded cylinder 6 until it touches capsule 5. Further still, the left side of perforated pipe 7 and the right side of drill rod head 3 will squeeze and expand capsule 5, filling the interior of the borehole and sealing the bottom of the borehole. After sealing, the worker injects cement grout into the interior of perforated pipe 7 through drill rod 1 and chemical grout into the interior of perforated pipe 7 through grouting pipe 9. Chemical grout will accelerate the solidification of cement grout, and due to the expansion of capsule 5 sealing the bottom of the borehole, cement grout and chemical grout can fill the crack well and quickly.

[0025] By feeding and rotating the drill rod, the teeth at the bottom of the sufficiently long perforated tube abut against the bottom of the borehole, increasing friction and keeping the perforated tube stable during drill rod rotation. Furthermore, after the drill rod has rotated for a certain period, the threaded cylinder moves sharply into the perforated tube, squeezing the capsule and causing it to expand, sealing the gap between the drill rod's outer edge and the borehole wall. Compared to traditional devices, this device provides a positioning seal above the grouting area at the bottom of the borehole, allowing cement and chemical grout to be quickly and fully injected into the positioned cracks requiring grouting. This avoids grout leakage or uneven filling, effectively improving grouting quality and efficiency.

[0026] The outer wall of the perforated pipe 7 has holes for grouting, and the teeth 8 can abut against the bottom of the drilled hole to increase friction.

[0027] By setting the teeth 8, the perforated tube 7 is prevented from rotating synchronously with the threaded cylinder 6 when the threaded cylinder 6 rotates, ensuring that the threaded cylinder 6 can smoothly enter the interior of the perforated tube 7.

[0028] The left outer wall of the threaded cylinder 6 is smooth, the right side of the threaded cylinder 6 is threaded, and the length of the smooth outer wall of the threaded cylinder 6 is greater than the length of the connection between the flower tube 7 and the threaded cylinder 6.

[0029] Because the length of the smooth outer wall of the threaded cylinder 6 is greater than the length of the connection between the perforated tube 7 and the threaded cylinder 6, there is still enough space for the threaded end of the threaded cylinder 6 to move after it is fully inserted into the perforated tube 7, thus preventing the threaded cylinder 6 from getting stuck.

[0030] The nut 2 and the perforated tube 7 are positioned correspondingly, and the inner diameter of the right side of the nut 2 is the same as the inner diameter of the left side of the perforated tube 7.

[0031] Because the inner diameter of the perforated tube 7 is suitable, when the threaded cylinder 6 moves into the hole, the perforated tube 7 will squeeze the capsule 5, causing the capsule 5 to expand and preventing the perforated tube 7 from getting stuck.

[0032] One end of the grouting pipe 9 extends through the drill rod 1 to the outside of the hole to transport chemical grout.

[0033] The drill rod 1, connecting pipe 4, threaded cylinder 6 and perforated pipe 7 are interconnected, and the drill rod 1 is used to transport cement slurry.

[0034] Working principle and usage process of this utility model:

[0035] During drilling, if a ground fissure is encountered, the workers first assemble the device. First, they tighten the drill head 3 at the right end of drill rod 1 and the nut 2. Then, they tighten the nut 2 and the connecting pipe 4. Next, they thread the threaded cylinder 6 and the perforated pipe 7 together, ensuring that the threaded cylinder 6 is not completely inserted into the perforated pipe 7. At this point, the workers can use the drilling equipment to insert the device into the borehole. When the perforated pipe 7 reaches the bottom of the borehole, the drilling equipment applies a downward force to it, causing the teeth 8 at the right end of the perforated pipe 7 to abut against the bottom of the hole. Then, drill rod 1 begins to rotate. As drill rod 1 rotates, it drives the connecting pipe 4 and the threaded cylinder 6 to rotate. The rotation of the threaded cylinder 6 causes it to move along the perforated pipe 7, which is threaded with it, towards the bottom of the hole. It is worth noting that because the teeth 8 abut against the bottom of the hole, the friction between the perforated pipe 7 and the bottom of the hole increases. Furthermore, as the threaded cylinder 6 rotates, the perforated pipe... Pipe 7 will not rotate, ensuring that threaded cylinder 6 smoothly enters the interior of perforated pipe 7. As threaded cylinder 6 continues to rotate, when the threaded end on the right side of threaded cylinder 6 is fully inside perforated pipe 7, the connection between perforated pipe 7 and threaded cylinder 6 will lose its threaded fixation. At this time, the downward force applied by drill rod 1 will cause threaded cylinder 6 to move sharply into perforated pipe 7. Further, the left end of perforated pipe 7 will slide on the smooth outer wall on the left side of threaded cylinder 6 until it touches capsule 5. Further still, the left side of perforated pipe 7 and the right side of drill rod head 3 will squeeze and expand capsule 5, filling the interior of the borehole and sealing the bottom of the borehole. After sealing, the worker injects cement grout into the interior of perforated pipe 7 through drill rod 1 and chemical grout into the interior of perforated pipe 7 through grouting pipe 9. Chemical grout will accelerate the solidification of cement grout, and due to the expansion of capsule 5 sealing the bottom of the borehole, cement grout and chemical grout can fill the crack well and quickly.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] 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 combined drilling tool for fast grouting hole sealing in underground coal mines, comprising a drill rod (1), characterized in that: The right end of the drill rod (1) is provided with a drill rod head (3), the outer wall of the drill rod head (3) is threadedly sleeved with a nut (2), the nut (2) and the drill rod head (3) are locked and fixed, the right side of the nut (2) is threadedly sleeved with a connecting pipe (4); The outer wall of the connecting pipe (4) is provided with a capsule (5), the right side of the connecting pipe (4) is fixedly installed with a threaded barrel (6), the right side of the threaded barrel (6) is threadedly sleeved with a flower pipe (7), the right side wall of the flower pipe (7) is fixedly installed with a tooth (8), and the inside of the threaded barrel (6) is provided with a grouting pipe (9).

2. The combined drilling tool for rapid grouting and hole sealing in underground coal mine according to claim 1, characterized in that: The outer wall of the flower pipe (7) is provided with a hole for grouting, and the tooth (8) can abut against the bottom of the drilled hole, so as to increase the friction.

3. The combined drilling tool for rapid grouting and hole sealing in underground coal mine according to claim 1, characterized in that: The left outer wall of the threaded barrel (6) is smooth, the right side of the threaded barrel (6) is provided with a thread, and the length of the smooth outer wall of the threaded barrel (6) is greater than the length of the connection between the flower pipe (7) and the threaded barrel (6).

4. The combined drilling tool for rapid grouting and hole sealing in underground coal mine according to claim 1, characterized in that: The nut (2) and the flower pipe (7) correspond in position, and the right inner diameter of the nut (2) is the same as the left inner diameter of the flower pipe (7).

5. The combined drilling tool for rapid grouting and hole sealing in underground coal mine according to claim 1, characterized in that: One end of the grouting pipe (9) penetrates to the outside of the hole through the drill rod (1) and is used for conveying chemical slurry.

6. The combined drilling tool for rapid grouting and hole sealing in underground coal mine according to claim 1, characterized in that: The drill rod (1), the connecting pipe (4), the threaded barrel (6) and the flower pipe (7) are communicated with each other, and the drill rod (1) is used for conveying cement slurry.

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