A soft and broken coal rock directional grouting reinforcement device

Abstract

The application discloses a soft and broken coal rock directional grouting reinforcement device, which comprises a drilling rack, a drilling rod fixed at the output end of the drilling rack, two sealing flow resistance components arranged in an up-down mode and sleeved on the drilling rod, the two sealing flow resistance components being capable of being in contact on the inner wall of a grouting borehole through expansion and contraction, a grouting device arranged on the drilling rod and located between the two sealing flow resistance components, and an internal jet mechanism coaxially arranged in the drilling rod.

Description

Technical Field

[0001] This invention belongs to the field of grouting reinforcement technology, specifically a directional grouting reinforcement device for soft and broken coal and rock. Background Technology

[0002] Due to geological conditions and mining activities, coal and rock lose their original stability and strength, becoming soft and easily broken. Soft and broken coal and rock possess characteristics such as looseness, fracturing, deformability, and permeability. Currently, grouting reinforcement can improve the strength and stability of soft and broken coal and rock. Commonly used grouting materials include cement grout and resin grout. However, while existing grouting drill rods can penetrate deep into soft and broken coal and rock for grouting, the characteristics of these materials make them prone to flow loss and instability, failing to maintain stable grout within the coal and rock. Therefore, it is necessary to provide a directional grouting reinforcement device for soft and broken coal and rock to solve the problems mentioned in the background technology. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: a directional grouting reinforcement device for soft and broken coal and rock, comprising:

[0004] Drilling frame;

[0005] The drill rod is fixed at the output end of the drilling rig frame;

[0006] A sealing and flow-blocking assembly is sleeved on the drill rod. There are two sealing and flow-blocking assemblies arranged vertically, and both sealing and flow-blocking assemblies can expand and contract to contact the inner wall of the grouting borehole.

[0007] The grouting device is installed on the drill rod near the port, and is located between the two sealing flow-blocking components.

[0008] The internal jet mechanism is coaxially mounted inside the drill rod.

[0009] Furthermore, preferably, the internal jet mechanism includes:

[0010] A high-pressure jet tube is coaxially fixed inside the drill rod, and an inner tube is fixed inside the drill rod, with one end of the inner tube connected to the high-pressure jet tube.

[0011] A drill bit is sleeved and fixed to the end of a drill rod. A jet head is provided on one side of the drill bit, and one end of the jet head is connected to the inner tube.

[0012] A pressure pump is mounted on the drilling rig and connected to one side of the high-pressure jet pipe. The pressure pump is capable of delivering jet abrasive or water at high pressure.

[0013] Furthermore, as a preferred embodiment, a guide sleeve is fixed inside the drill rod, a sleeve is slidably disposed inside the guide sleeve, one end of the sleeve is sealed and slidably disposed in the inner tube, an inner flow pipe is fixed inside the guide sleeve, the jet head is rotatably disposed inside the drill head, one end of the inner flow pipe is connected to the jet head through a rotating pipe, a transmission rod is hinged to one end of the inner flow pipe, one end of the transmission rod is connected to the jet head, a flow baffle is disposed at one end of the sleeve, and an inner spring is connected between the sleeve and the inner tube.

[0014] Furthermore, as a preferred embodiment, as the pressure of the jet abrasive or water being transported in the high-pressure jet pipe increases, the sleeve can slide axially under the push of the baffle plate, causing the jet head to deflect synchronously and ultimately be erected relatively perpendicular to the high-pressure jet pipe.

[0015] Furthermore, preferably, the sealing and flow-blocking assembly includes:

[0016] A fixed ring frame is sleeved and fixed to the outside of the drill rod, and an inner drive disc is rotatably mounted on the fixed ring frame;

[0017] There are five telescopic support rods distributed circumferentially, and each telescopic support rod is rotatably connected to a fixed ring frame. The telescopic end of each telescopic support rod is connected to the inner drive disc.

[0018] An inner support plate, correspondingly connected to each of the aforementioned telescopic support rods, has a cross-section configured as an arc shape; and

[0019] The sealing ring and sealing sleeve are installed on the drill pipe.

[0020] Furthermore, preferably, the grouting device includes:

[0021] The grouting nozzles are multiple and distributed circumferentially, and each grouting nozzle is vertically connected to the circumferential sidewall of the drill rod.

[0022] A flow-stopping component is slidably disposed in each of the grouting nozzles. A sealing rubber ring is embedded and fixed inside the drill rod. Multiple support rods corresponding to the flow-stopping component are vertically connected to the sealing rubber ring. One end of each support rod is connected to the flow-stopping component via a hinge.

[0023] The upper ring frame is sleeved outside the high-pressure jet tube in the inner jet mechanism, and multiple limiting springs are provided between the upper ring frame and the high-pressure jet tube.

[0024] Furthermore, preferably, the inner wall cross-section of the grouting nozzle is constructed into a trapezoidal structure, and the flow interceptor can seal with the end of the grouting nozzle under sliding action.

[0025] Furthermore, as a preferred embodiment, a guide plate is coaxially arranged inside the drill rod above the sealing rubber ring, and an inner shaft ring is rotatably arranged inside the guide plate. A micro motor is fixed on the guide plate, and the output end of the micro motor is connected to the inner shaft ring for transmission through gear meshing. A top block is fixed on the inner shaft ring, and a guide groove is opened on the lower end face of the upper ring frame. The top block slides against the guide groove, and its contact surface is set as an inclined structure, so that the upper ring frame is eccentrically or concentrically mounted relative to the drill rod.

[0026] Furthermore, as a preferred embodiment, the guide plate is slidably disposed within the drill rod, and a fine-tuning telescopic rod is disposed within the drill rod, with one end of the fine-tuning telescopic rod connected to the guide plate.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] In this invention, the directional grouting reinforcement device can perform radial grouting within the borehole during grouting, thereby preventing the axial flow and dispersion of grouting material in soft and broken coal. Two sealing and flow-blocking components work together to block the flow surface, reducing the flow of grouting material. In particular, the internal jetting mechanism further jets the grouting material into the soft and broken coal rock to form grouting pores and improve the reinforcement retention. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the internal jet mechanism in this invention;

[0031] Figure 3 This is a schematic diagram of the sleeve structure in this invention;

[0032] Figure 4 This is a schematic diagram of the sealing and flow-blocking assembly in this invention;

[0033] Figure 5 This is a schematic diagram of the grouting device in this invention;

[0034] Figure 6 This is a schematic diagram of the guide disk structure in this invention;

[0035] In the diagram: 1. Drill rod; 11. Drilling frame; 2. Sealing and flow-blocking assembly; 21. Fixed ring frame; 22. Inner drive disc; 23. Telescopic support rod; 24. Inner support plate; 25. Sealing ring; 3. Grouting device; 31. Grouting nozzle; 32. Cut-off component; 33. Sealing rubber ring; 34. Upper ring frame; 35. Limiting spring; 4. Inner jet mechanism; 41. High-pressure jet pipe; 42. Inner pipe fitting; 43. Drill head; 44. Jet head; 45. Guide sleeve; 46. Casing; 47. Inner flow pipe; 48. Transmission rod; 49. Flow-blocking plate; 5. Guide disc; 51. Inner shaft collar; 52. Top block; 53. Fine-tuning telescopic rod. Detailed Implementation

[0036] Please see Figure 1 In this embodiment of the invention, a directional grouting reinforcement device for soft and broken coal and rock includes:

[0037] Drilling frame 11;

[0038] Drill rod 1 is fixed to the output end of drilling frame 11;

[0039] A sealing and flow-blocking component 2 is sleeved on the drill rod 1. There are two sealing and flow-blocking components 2 arranged vertically, and both sealing and flow-blocking components 2 can expand and contract to contact the inner wall of the grouting borehole.

[0040] The grouting device 3 is installed on the drill rod 1 near the port position and is located between the two sealing flow-blocking components 2.

[0041] The internal jet mechanism 4 is coaxially mounted inside the drill rod 1. Compared to traditional grouting equipment, this invention can:

[0042] 1. Improved grouting effect: Soft and broken coal usually has high permeability and fracturing properties, making it difficult for traditional grouting equipment to effectively inject grouting materials into it. However, radial grouting within the borehole using a grouting device can better fill and consolidate voids and cracks in the coal and rock, thus improving the grouting effect.

[0043] 2. Preventing Grout Loss: In traditional grouting processes, grout in soft, broken coal may experience axial flow and dispersion due to the permeability of the coal seam. Radial grouting within the borehole using a grouting device can avoid this problem. Radial injection ensures the grout fully fills the pores of the coal and rock, reducing loss.

[0044] 3. Improved grouting quality and consistency: The grouting device can control the flow rate and pressure of the grouting material, thereby achieving a more accurate and consistent grouting effect. This improves grouting quality, ensures that the grouting material fully penetrates into the soft, broken coal, and effectively consolidates the coal and rock, enhancing its stability.

[0045] In this embodiment, the internal jet mechanism 4 includes:

[0046] The high-pressure jet pipe 41 is coaxially fixed inside the drill rod 1. An inner pipe fitting 42 is fixed inside the drill rod 1, and one end of the inner pipe fitting 42 is connected to the high-pressure jet pipe 41.

[0047] The drill bit 43 is sleeved and fixed to the end of the drill rod 1. A jet head 44 is provided on one side of the drill bit 43, and one end of the jet head 44 is connected to the inner tube 42.

[0048] A pressure pump is installed on the drilling frame 11 and connected to one side of the high-pressure jet pipe 41. The pressure pump can deliver jet abrasive or water at high pressure, that is, the jet head can jet coal from the side wall of the grouting borehole to increase the grouting porosity.

[0049] In a preferred embodiment, a guide sleeve 45 is fixed inside the drill rod 1, and a sleeve 46 is slidably disposed inside the guide sleeve 45. One end of the sleeve 46 is sealed and slidably disposed in the inner tube 42. An inner flow pipe 47 is fixed inside the guide sleeve 45. The jet head 44 is rotatably disposed inside the drill head 43. One end of the inner flow pipe 47 is connected to the jet head 44 through a rotating pipe. A transmission rod 48 is hinged to one end of the inner flow pipe 47. One end of the transmission rod 48 is connected to the jet head 44. A flow baffle 49 is disposed at one end of the sleeve 46. An inner spring is connected between the sleeve 46 and the inner tube 52.

[0050] In this embodiment, as the pressure of the jet abrasive or water being transported in the high-pressure jet pipe 41 increases, the sleeve 46 can slide axially under the push of the flow baffle 49, causing the jet head 44 to deflect synchronously and eventually be erected relatively perpendicular to the high-pressure jet pipe 41. Especially before the positioning grouting reinforcement, the low-pressure pump is used to pump the coal breaking jet abrasive or water for the grouting reinforcement point, so that the grouting reinforcement point forms a fan-shaped breaking hole. Then, during the high-pressure pumping, the jet head can break the coal radially along the grouting borehole, thereby forming a grouting flow hole.

[0051] In this embodiment, the sealing and flow-blocking assembly 2 includes:

[0052] A fixed ring frame 21 is sleeved and fixed to the outside of the drill rod 1, and an inner drive disk 22 is rotatably mounted on the fixed ring frame 21.

[0053] There are five telescopic support rods 23 distributed circumferentially. Each telescopic support rod 23 is rotatably connected to the fixed ring frame 21. The telescopic end of the telescopic support rod 23 is connected to the inner drive disk 22.

[0054] An inner support plate 24 is correspondingly connected to each of the telescopic support rods 23, and the cross-section of the inner support plate 24 is set as an arc-shaped structure; and

[0055] The sealing ring 25 is fitted onto the drill rod 1, meaning that the sealing ring can seal against the inner wall of the grouting borehole, thereby forming a flow sealing surface.

[0056] In this embodiment, the grouting device 3 includes:

[0057] There are multiple grouting nozzles 31 distributed circumferentially, and each grouting nozzle 31 is vertically connected to the circumferential side wall of the drill rod 1.

[0058] A flow-stopping element 32 is slidably disposed in each of the grouting nozzles 31. A sealing rubber ring 33 is embedded and fixed inside the drilling rod 1. Multiple support rods corresponding to the flow-stopping element 32 are vertically connected to the sealing rubber ring 33. One end of each support rod is connected to the flow-stopping element 32 via a hinge.

[0059] The upper ring frame 34 is sleeved outside the high-pressure jet pipe 41 in the inner jet mechanism 4. Multiple limiting springs 35 are provided between the upper ring frame 34 and the high-pressure jet pipe 41. The grouting material delivered in the drilling rod can be ejected from each grouting nozzle, thereby forming radial grouting reinforcement of the grouting borehole.

[0060] In a preferred embodiment, the inner wall cross-section of the grouting nozzle 31 is constructed into a trapezoidal structure, and the flow interceptor 32 can be sealed with the end of the grouting nozzle 31 under sliding action, so as to control the grouting flow rate in each radial direction. Especially in fixed-point grouting, it can achieve all-round grouting coverage of the grouting borehole in the radial direction, and can also supply high-pressure grouting in the main grouting direction, thereby improving the grouting reinforcement strength.

[0061] In this embodiment, a guide plate 5 is coaxially arranged inside the drill rod 1 above the sealing rubber ring 33. An inner shaft ring 51 is rotatably arranged inside the guide plate 5. A micro motor is fixed on the guide plate 5. The output end of the micro motor is connected to the inner shaft ring 51 through gear meshing. A top block 52 is fixed on the inner shaft ring 51. A guide groove is opened on the lower end face of the upper ring frame 34. The top block 52 slides against the guide groove, and its contact surface is set as an inclined structure, so that the upper ring frame 34 is eccentric or concentric relative to the drill rod 1.

[0062] In this embodiment, the guide plate 5 is slidably disposed inside the drilling rod 1. The drilling rod 1 is provided with a fine-tuning telescopic rod 53. One end of the fine-tuning telescopic rod 53 is connected to the guide plate 5. That is, when the top block on the inner ring is in full contact with the guide groove on the upper ring frame, the upper ring frame is relatively eccentrically mounted. The inner ring can drive the upper ring frame to one side through the top block under rotational adjustment. At this time, the grouting nozzle on the corresponding side is in a fully flowing state, while the grouting nozzle on the other side is sealed by the interceptor. Under the extension and retraction adjustment of the fine-tuning telescopic rod, the inner ring moves axially downward. The top block on the inner ring is not in full contact with the guide groove on the upper ring frame, that is, the eccentric distance of the upper ring frame is short or it is mounted in the same circle. At this time, all grouting nozzles are in a flowing state (where the flow rate of the grouting material is different, or the same under adjustment), so that all-round grouting coverage of the grouting point can be achieved.

[0063] Specifically, in grouting of soft and broken coal and rock, the drill rod is drilled to form a grouting borehole. For fixed-point grouting in the grouting borehole, the internal jet mechanism is used to pre-jet break the coal at the grouting point. Then, according to the grouting point, the sealing and flow-blocking components are used to seal the upper and lower parts to form a flow sealing surface. The grouting device is primarily reinforced by radial grouting in the main direction using multiple grouting nozzles (i.e., the upper ring frame is eccentrically adjusted). After filling, all grouting nozzles are used simultaneously to perform grouting work and complete the final filling. For filling the grouting borehole, the drill rod can be retracted outward section by section. At this time, only a single sealing and flow-blocking component is used to seal the flow and prevent the grouting material from flowing out.

[0064] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A directional grouting reinforcement device for soft and broken coal and rock, characterized in that: It includes: Drilling frame (11); The drill rod (1) is fixed at the output end of the drilling frame (11); A sealing flow blocking component (2) is sleeved on the drill rod (1). There are two sealing flow blocking components (2) arranged vertically. Both sealing flow blocking components (2) can expand and contract to contact the inner wall of the grouting borehole. The grouting device (3) is installed on the drill rod (1) near the port position and located between the two sealing flow-blocking components (2). The internal jet mechanism (4) is coaxially installed inside the drill rod (1); The internal jet mechanism (4) includes: A high-pressure jet pipe (41) is coaxially fixed inside the drilling rod (1). An inner pipe fitting (42) is fixed inside the drilling rod (1). One end of the inner pipe fitting (42) is connected to the high-pressure jet pipe (41). The drill bit (43) is sleeved and fixed to the end of the drill rod (1). A jet head (44) is provided on one side of the drill bit (43), and one end of the jet head (44) is connected to the inner tube (42). A pressure pump is installed on the drilling frame (11) and connected to one side of the high-pressure jet pipe (41). The pressure pump is capable of delivering jet abrasive or water at high pressure. A guide sleeve (45) is fixed inside the drill rod (1). A sleeve (46) is slidably arranged inside the guide sleeve (45). One end of the sleeve (46) is sealed and slidably in the inner tube (42). An inner flow pipe (47) is arranged inside the sleeve (46). The jet head (44) is rotatably arranged inside the drill head (43). One end of the inner flow pipe (47) is connected to the jet head (44) through a rotating pipe. A transmission rod (48) is hinged to one end of the inner flow pipe (47). One end of the transmission rod (48) is connected to the jet head (44). A flow baffle (49) is arranged at one end of the sleeve (46). An inner spring is connected between the sleeve (46) and the inner tube (42).

2. The directional grouting reinforcement device for soft and broken coal and rock according to claim 1, characterized in that: As the pressure of the jet abrasive or water being transported in the high-pressure jet pipe (41) increases, the sleeve (46) can slide axially under the push of the baffle plate (49), causing the jet head (44) to deflect synchronously and eventually be set relatively perpendicular to the high-pressure jet pipe (41).

3. The directional grouting reinforcement device for soft and broken coal and rock according to claim 1, characterized in that: The sealing flow-blocking assembly (2) includes: A fixed ring frame (21) is sleeved and fixed outside the drill rod (1), and an inner drive disk (22) is rotatably provided on the fixed ring frame (21); There are five telescopic support rods (23) distributed circumferentially. Each telescopic support rod (23) is rotatably connected to the fixed ring frame (21). The telescopic end of the telescopic support rod (23) is connected to the inner drive disk (22). The inner support plate (24) is connected to each of the telescopic support rods (23), and the cross-section of the inner support plate (24) is set as an arc structure; A sealing ring (25) is provided on the drill rod (1).

4. The directional grouting reinforcement device for soft and broken coal and rock according to claim 1, characterized in that: The grouting device (3) includes: The grouting nozzles (31) are multiple in a circumferential distribution, and each of the grouting nozzles (31) is vertically connected to the circumferential side wall of the drill rod (1); The flow cut-off element (32) is slidably disposed in each of the grouting nozzles (31). A sealing rubber ring (33) is embedded and fixed in the drilling rod (1). A plurality of support rods corresponding to the flow cut-off element (32) are vertically connected to the sealing rubber ring (33). One end of the support rod is connected to the flow cut-off element (32) through a hinge rod. The upper ring frame (34) is sleeved outside the high-pressure jet tube (41) in the inner jet mechanism (4), and multiple limiting springs (35) are provided between the upper ring frame (34) and the high-pressure jet tube (41).

5. The directional grouting reinforcement device for soft and broken coal and rock according to claim 4, characterized in that: The inner wall cross-section of the grouting nozzle (31) is constructed into a trapezoidal structure, and the flow interceptor (32) can be sealed with the end of the grouting nozzle (31) under sliding action.

6. The directional grouting reinforcement device for soft and broken coal and rock according to claim 5, characterized in that: A guide plate (5) is coaxially arranged inside the drill rod (1) above the sealing rubber ring (33). An inner shaft ring (51) is rotatably arranged inside the guide plate (5). A micro motor is fixed on the guide plate (5). The output end of the micro motor is connected to the inner shaft ring (51) through gear meshing. A top block (52) is fixed on the inner shaft ring (51). A guide groove is opened on the lower end face of the upper ring frame (34). The top block (52) slides against the guide groove, and its contact surface is set as an inclined structure, so that the upper ring frame (34) is eccentric or concentric relative to the drill rod (1).

7. The directional grouting reinforcement device for soft and fractured coal and rock according to claim 6, characterized in that: The guide plate (5) is slidably disposed inside the drill rod (1), and a fine-tuning telescopic rod (53) is disposed inside the drill rod (1), one end of which is connected to the guide plate (5).

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