A grouting reinforcement system applicable to in-hole grouting of directional holes in coal mines

Abstract

The present invention provides a grouting reinforcement system applicable to in-hole grouting of directional holes in coal mines, which includes a packer, a drill pipe string, a water swivel and a pressure tee. The pressure tee is connected with a clean water pump and a grouting pump. The packer includes a support pipe, an extension pipe and a rubber sleeve. One end of the support pipe is connected with the drill pipe string. The interior of the extension pipe is provided with a support rod, a connecting rod and a piston. In the present invention, the grouting borehole is blocked by the packer, which facilitates the grouting and displacement grouting operations into the grouting borehole, effectively ensuring the grouting volume and grouting pressure. The grouting borehole outside the packer will not be filled with cement slurry, eliminating the need for through-hole drilling and reducing a large amount of repeated footage. The water pressure in the support pipe is controlled by the movement of the piston in the support pipe, and the spherical protrusions on the water injection holes are pushed open by different water pressure magnitudes to realize the switching of the opening and closing states of the water injection channels, without damaging the structure of the grouting reinforcement system itself. After being retrieved, it can be reused repeatedly, making it more environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of grouting reinforcement systems, and specifically to a grouting reinforcement system suitable for in-hole grouting of directional holes in coal mines. Background Art

[0002] During coal mining, cement slurry is often injected into tectonic fracture zones or water outlets through directional drilling for reinforcement. The cement slurry precipitates and solidifies prematurely in the drill hole, resulting in the grouting volume and grouting pressure not meeting the requirements of the designed reinforcement, making the grouting effect unsatisfactory. After waiting for the setting, it is necessary to re-drill the hole, causing repeated footage and wasting a large amount of time and manpower.

[0003] The Chinese invention patent with the publication number CN114737913A discloses a local grouting reinforcement system and grouting method for in-hole of long drill holes in coal mines. The local grouting reinforcement system for in-hole of long drill holes in coal mines is sequentially connected with a packer, a drill pipe string, a water bend and a pressure tee along the axial direction; the second channel of the pressure tee is connected with a setting pipe and a water pump; the third channel of the pressure tee is connected with a grouting pipe and a grouting pump; water flows through the water pump, the setting pipe, the second channel of the pressure tee and the drill pipe string in sequence and is filled into the packer, and the packer expands radially to radially seal a part of the drill hole; after the setting is completed, the grouting channel is opened by water pressure, and the grouting liquid passes through the grouting pump, the grouting pipe, the third channel of the pressure tee, the drill pipe string and the packer in sequence to realize local grouting reinforcement of the drill hole. During the use of this system, the plugging pins in the packer are sheared and broken under pressure. When grouting next time, it is necessary to replace the packer or the plugging pins in the packer, which is time-consuming and does not meet the requirements of green environmental protection. Summary of the Invention

[0004] Aiming at the above-mentioned existing technical deficiencies, the purpose of the present invention is to provide a grouting reinforcement system suitable for in-hole grouting of directional holes in coal mines, realizing in-hole local grouting, effectively ensuring the grouting volume and grouting pressure, having no problem of component loss, and being more environmentally friendly in use.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A grouting reinforcement system applicable to in-hole grouting of directional holes in coal mines, comprising a packer, a drill pipe string, a swivel, and a pressure tee connected in sequence. A water pump is connected to the second channel of the pressure tee, and a grouting pump is connected to the third channel. The packer includes a support pipe, an extension pipe, and a rubber sleeve. One end of the support pipe is connected to the drill pipe string; the extension pipe is movably sleeved on the support pipe; the rubber sleeve is sleeved on the support pipe, and one end of the rubber sleeve is fixedly connected to the support pipe, and the other end is fixedly connected to the extension pipe; a support rod, a connecting rod, and a piston are arranged inside the extension pipe; the axes of the piston, the connecting rod, and the extension pipe coincide; the piston is fixed to one end of the connecting rod close to the support pipe; the support rod is fixedly connected to the end of the connecting rod away from the piston, and the support rod is fixedly connected to the inner wall of the extension pipe; the outer wall of the piston is in frictional contact with the inner wall of the support pipe; a water injection cavity is arranged between the inner wall of the rubber sleeve and the outer wall of the support pipe; a water injection hole communicating with the water injection cavity is arranged on the support pipe; a spherical protrusion adapted to the water injection hole is integrally arranged on the inner wall of the rubber sleeve, and the diameter of the spherical protrusion is greater than the diameter of the water injection hole; the spherical protrusion abuts against the water injection hole; a guide block is integrally arranged on the side wall of the piston, and a guide groove adapted to the guide block is arranged on the inner wall of the support pipe, and the guide block is slidably arranged in the guide groove.

[0007] Preferably, the guide groove includes a first circular groove, a first linear groove, a second circular groove, and a second linear groove; the first circular groove and the second circular groove have the same horizontal height in the support pipe, the horizontal height of the first linear groove is higher than that of the first circular groove, and the horizontal height of the second linear groove is lower than that of the first circular groove; both ends of the first linear groove are respectively communicated with the first circular groove and the second circular groove; one end of the second linear groove is communicated with the second circular groove, and the other end extends parallel to the axis of the support pipe to the outside of the support pipe.

[0008] Preferably, a first rubber cushion block is fixedly arranged on one side of the first circular groove close to the first linear groove; a second rubber cushion block is fixedly arranged on one side of the second circular groove close to the second linear groove.

[0009] Preferably, a pressure gauge, a first valve, and a pressure relief pipe are arranged on the swivel; the pressure relief pipe is arranged at one end of the swivel away from the drill pipe string.

[0010] Preferably, a second valve is arranged on the second channel of the pressure tee; a third valve is arranged on the third channel.

[0011] Preferably, an elastic tightening ring is arranged inside the rubber sleeve; the axis of the elastic tightening ring coincides with the axis of the rubber sleeve; the elastic tightening ring penetrates through the spherical protrusion.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] In the present invention, a packer is used to block the grouting borehole, facilitating grouting and displacement grouting operations into the grouting borehole, effectively ensuring the grouting volume and grouting pressure. The grouting borehole outside the packer will not be filled with cement slurry, eliminating the need for through-hole drilling and reducing a large amount of repeated footage; the water pressure inside the support pipe is controlled by the movement of the piston within the support pipe, and spherical protrusions on the water injection holes are pushed open by different water pressure magnitudes to achieve the switching of the opening and closing states of the water injection channels, without damaging the structure of the grouting reinforcement system itself. After being retracted, it can be reused repeatedly, making it more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention;

[0015] Figure 2 is an internal structural diagram of the present invention;

[0016] Figure 3 is Figure 2 a partial enlarged view of part A in

[0017] Figure 4 is a schematic sectional structural diagram of the present invention;

[0018] Figure 5 is Figure 4 a partial enlarged view of part B in

[0019] Figure 6 is a schematic exploded structural diagram of the present invention;

[0020] Figure 7 is a sectional structural diagram of the support pipe in the present invention;

[0021] Figure 8 is an internal structural diagram of the extension pipe in the present invention;

[0022] Figure 9 is an internal structural diagram of the rubber sleeve in the present invention;

[0023] Figure 10 is an internal structural diagram of the support pipe in the present invention.

[0024] Wherein:

[0025] 1. Pressure gauge; 2. First valve; 3. Pressure tee; 4. Second channel; 5. Water pump; 6. Grouting pump; 7. Third channel; 8. Pressure relief pipe; 9. Flush toilet; 10. Drill pipe string; 11. Support pipe; 12. Rubber sleeve; 13. Extension pipe; 14. Piston; 15. Spherical protrusion; 16. Water injection hole; 17. Water injection cavity; 18. Guide block; 19. Connecting rod; 20. Elastic tightening ring; 21. First straight groove; 22. Second rubber cushion block; 23. Second straight groove; 24. Second circular groove; 25. First rubber cushion block; 26. First circular groove; 27. Support rod. Detailed implementation manner

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Such as Figures 1 to 10As shown in the figure, a grouting reinforcement system applicable to in-hole grouting of directional holes in coal mines includes a packer, a drill pipe string 10, a water swivel 9, and a pressure tee 3 that are sequentially threadedly connected. The second channel 4 of the pressure tee 3 is connected to a water pump 5, and the water pump 5 is connected to a water pipeline. The third channel 7 is connected to a grouting pump 6, and the grouting pump 6 is connected to a grouting pipeline. The packer includes a support pipe 11, an extension pipe 13, and a rubber sleeve 12. One end of the support pipe 11 is threadedly connected to the drill pipe string 10. The extension pipe 13 is movably sleeved on the support pipe 11, and there is a gap between the ends of the extension pipe 13 close to the support pipe 11. The rubber sleeve 12 is sleeved on the support pipe 11 and is arranged in the gap between the extension pipe 13 and the support pipe 11. One end of the rubber sleeve 12 is fixedly connected to the support pipe 11, and the other end is fixedly connected to the extension pipe 13. Inside the extension pipe 13, there are a support rod 27, a connecting rod 19, and a piston 14. The axes of the piston 14, the connecting rod 19, and the extension pipe 13 coincide. The piston 14 is fixed to one end of the connecting rod 19 close to the support pipe 11. The support rod 27 is fixedly connected to the end of the connecting rod 19 away from the piston 14, and the support rod 27 is fixedly connected to the inner wall of the extension pipe 13. The outer wall of the piston 14 is in frictional contact with the inner wall of the support pipe 11, and the piston 14 can slide along the axis direction of the support pipe 11 inside the support pipe 11. An injection cavity 17 is arranged between the inner wall of the rubber sleeve 12 and the outer wall of the support pipe 11. The support pipe 11 is provided with an injection hole 16 communicating with the injection cavity 17. An integrally formed spherical protrusion 15 adapted to the injection hole 16 is arranged on the inner wall of the rubber sleeve 12, and the diameter of the spherical protrusion 15 is larger than the diameter of the injection hole 16. The spherical protrusion 15 abuts against the injection hole 16. The rubber sleeve 12 has elasticity, and through the elasticity of the rubber sleeve 12, the spherical protrusion 15 always abuts against the injection hole 16 in the natural state to block the injection hole 16 and cut off the communication between the injection hole 16 and the injection cavity 17. A guide block 18 is integrally arranged on the side wall of the piston 14. The guide block 18 is in the shape of a cylinder, and the axis of the guide block 18 is perpendicular to the axis of the piston 14. A guide groove adapted to the guide block 18 is arranged on the inner wall of the support pipe 11, and the guide block 18 is slidably arranged in the guide groove. In the initial state, the piston 14 is arranged inside the support pipe 11 to block the inside of the support pipe 11.

[0028] Further, Figure 7The attached drawings determine the upper and lower direction references. The guiding groove includes a first circular groove 26, a first linear groove 21, a second circular groove 24, and a second linear groove 23. The first circular groove 26 and the second circular groove 24 have the same horizontal height inside the support pipe 11. The horizontal height of the first linear groove 21 is higher than that of the first circular groove 26, and the horizontal height of the second linear groove 23 is lower than that of the first circular groove 26. Both ends of the first linear groove 21 are respectively communicated with the first circular groove 26 and the second circular groove 24. The first circular groove 26 is located on the side of the support pipe 11 close to the drill pipe string 10. One end of the second linear groove 23 is communicated with the second circular groove 24, and the other end extends outward parallel to the axis of the support pipe 11. In the initial state, the guiding block 18 on the piston 14 is arranged in the first circular groove 26. When the guiding block 18 slides out from the second linear groove 23, the piston 14 moves to the outside of the support pipe 11.

[0029] Further, as Figure 7 shown, a first rubber cushion block 25 is fixedly arranged on one side of the first circular groove 26 close to the first linear groove 21. A second rubber cushion block 22 is fixedly arranged on one side of the second circular groove 24 close to the second linear groove 23. When the piston 14 is under pressure, the guiding block 18 squeezes the first rubber cushion block 25 to deform the first rubber cushion block 25, and then the guiding block 18 slides along the deformed first rubber cushion block 25 into the first linear groove 21, and then enters the second circular groove 24. When the piston 14 continues to be under pressure, it squeezes the second rubber cushion block 22 to deform it, and the guiding block 18 enters the second linear groove 23 along the deformed second rubber cushion block 22 and slides out along the second linear groove 23.

[0030] Further, as Figure 1 shown, a pressure gauge 1, a first valve 2, and a pressure relief pipe 8 are arranged on the water closet 9. The pressure relief pipe 8 is used to discharge excess slurry and clean water. The pressure relief pipe 8 is arranged at one end of the water closet 9 far from the drill pipe string 10.

[0031] Further, as Figure 1 shown, a second valve is arranged on the second channel 4 of the pressure tee 3. After opening the second valve, clean water is pumped into the grouting hole through the clean water pump 5. A third valve is arranged on the third channel 7. After opening the third valve, slurry is pumped into the grouting hole through the grouting pump 6.

[0032] Further, as Figure 5 shown, an elastic tightening ring 20 is arranged inside the rubber sleeve 12. The axis of the elastic tightening ring 20 coincides with the axis of the rubber sleeve 12. The elastic tightening ring 20 penetrates through the spherical protrusion 15. By means of the elastic tightening ring 20, the elasticity at the spherical protrusion 15 of the rubber sleeve 12 is improved, so that the spherical protrusion 15 can block the water injection hole 16.

[0033] When in use, connect the packer and the drill pipe string 10, lower the packer to the predetermined position of the grouting borehole, connect the water valve 9 and the pressure tee 3, connect the clean water pump 5 with the clean water pipeline, connect the grouting pump 6 with the grouting pipeline, check whether the clean water pump 5 and the grouting pump 6 are working normally; close the third valve to cut off the grouting pipeline, use the clean water pump 5 to inject water into the packer according to the designed pressure, the water flow is blocked by the piston 14 in the support pipe 11, so that the pressure in the support pipe 11 increases, and the high-pressure water flow pushes the spherical protrusion 15 through the water injection hole 16, so that the spherical protrusion 15 is out of contact with the water injection hole 16, and the water flows into the water injection chamber 17. As the water pressure in the water injection chamber 17 increases, the rubber sleeve 12 The expansion occurs and blocks the grouting borehole. As the clean water continues to be pumped, the pressure on the piston 14 increases until the guide block 18 squeezes the first rubber pad 25 and deforms it. The guide block 18 slides into the first linear groove 21 along the deformed first rubber pad 25. In the process of the guide block 18 sliding from the first circular groove 26 to the first linear groove 21, the piston 14 will drive the extension tube 13 to rotate slightly around the axis of the extension tube 13 through the connecting rod 19. The elasticity of the rubber sleeve 12 does not affect the slight rotation. After the guide block 18 enters the first linear groove 21, it drives the extension tube 13 to continue moving along the axis of the support tube 11 toward the depth of the grouting borehole. At this time The pressure in the support tube 11 and the water injection cavity 17 decreases, and the expansion amplitude of the rubber sleeve 12 decreases. Under the action of elastic force, the spherical protrusion 15 blocks the water injection hole 16 again until the guide block 18 moves into the second circular groove 24, and the piston 14 stops sliding in the support tube 11. As the amount of clean water pumped increases, the water pressure in the support tube 11 increases again, and the water flow pushes the spherical protrusion 15 open again, and is injected into the water injection cavity 17 through the water injection hole 16, so that the rubber sleeve 12 expands again to block the grouting borehole. As the water pressure in the support tube 11 continues to increase, the pressure on the piston 14 increases, and the guide block 18 squeezes the second rubber pad 22 to deform and then slides along the second rubber pad 22 to the second straight groove 24. The piston 14 moves from the second linear groove 23 to the outside of the support tube 11, and the piston 14 is separated from the support tube 11. The water flows from the support tube 11 to the extension tube 13. The main water pipeline and the grouting borehole are connected by the change in the reading of the pressure gauge 1. At this time, the grouting borehole is blocked. The second valve is closed and the third valve is opened to inject grout into the grouting borehole. After the grouting pressure reaches the design requirement, the grouting is replaced according to the calculated displacement amount. The displacement amount is 1.Double it. After the replacement is completed, close the first valve 2, the second valve, and the third valve. Carry out setting according to the setting time determined by the cement setting test. After the setting is completed, open the pressure relief pipe 8 of the first valve 2 to relieve pressure. After the pressure relief is completed, push the support pipe 11 in the direction of the extension pipe 13 through the drill pipe string 10. The piston 14 moves into the support pipe 11, and the rubber sleeve 12 is squeezed, increasing the internal pressure thereof, and pushing the spherical protrusion 15 off the water injection hole 16. The clear water in the rubber sleeve 12 flows back into the support pipe 11 from the water injection hole 16 and is discharged through the pressure relief pipe 8. Then pull the drill pipe string 10 outwards. The rubber sleeve 12 is stretched and separated from the inner wall of the grouting borehole to complete the unsealing. The extension pipe 13 is pulled out of the grouting borehole together by the rubber sleeve 12 to complete the entire grouting process.

Claims

1. A grouting reinforcement system applicable to in - hole grouting of directional holes in coal mines, comprising a packer, a drill pipe string (10), a water - swivel (9) and a pressure tee (3) connected in sequence. The second channel (4) of the pressure tee (3) is connected to a water pump (5), and the third channel (7) is connected to a grouting pump (6). Characterized in that, The packer includes a support pipe (11), an extension pipe (13), and a rubber sleeve (12); one end of the support pipe (11) is connected to the drill pipe string (10); the extension pipe (13) is movably sleeved on the support pipe (11); the rubber sleeve (12) is sleeved on the support pipe (11), and one end of the rubber sleeve (12) is fixedly connected to the support pipe (11), and the other end is fixedly connected to the extension pipe (13); inside the extension pipe (13), there are a support rod (27), a connecting rod (19) and a piston (14); the axes of the piston (14), the connecting rod (19) and the extension pipe (13) coincide; the piston (14) is fixed to one end of the connecting rod (19) close to the support pipe (11); the support rod (27) is fixedly connected to the end of the connecting rod (19) far from the piston (14), and the support rod (27) is fixedly connected to the inner wall of the extension pipe (13); the outer wall of the piston (14) is in frictional contact with the inner wall of the support pipe (11); there is a water injection cavity (17) between the inner wall of the rubber sleeve (12) and the outer wall of the support pipe (11); the support pipe (11) is provided with a water injection hole (16) communicating with the water injection cavity (17); integrally provided on the inner wall of the rubber sleeve (12) is a spherical protrusion (15) adapted to the water injection hole (16), and the diameter of the spherical protrusion (15) is greater than the diameter of the water injection hole (16); the spherical protrusion (15) abuts against the water injection hole (16); integrally provided on the side wall of the piston (14) is a guide block (18), and on the inner wall of the support pipe (11) is provided a guide groove adapted to the guide block (18), and the guide block (18) is slidably arranged in the guide groove; The guide groove includes a first circular groove (26), a first linear groove (21), a second circular groove (24) and a second linear groove (23); the horizontal heights of the first circular groove (26) and the second circular groove (24) in the support pipe (11) are the same, the horizontal height of the first linear groove (21) is higher than that of the first circular groove (26), and the horizontal height of the second linear groove (23) is lower than that of the first circular groove (26); both ends of the first linear groove (21) are respectively communicated with the first circular groove (26) and the second circular groove (24); one end of the second linear groove (23) is communicated with the second circular groove (24), and the other end extends parallel to the axis of the support pipe (11) to the outside of the support pipe (11).

2. A grouting reinforcement system applicable to in - hole grouting of directional holes in coal mines as described in claim 1, Characterized in that, On one side of the first circular groove (26) close to the first linear groove (21), a first rubber cushion block (25) is fixedly arranged; on one side of the second circular groove (24) close to the second linear groove (23), a second rubber cushion block (22) is fixedly arranged.

3. A grouting reinforcement system applicable to in - hole grouting of directional holes in coal mines as described in claim 1, characterized in that, a pressure gauge (1), a first valve (2) and a pressure relief pipe (8) are arranged on the water - stool (9); the pressure relief pipe (8) is arranged at one end of the water - stool (9) far from the drill pipe string (10).

4. A grouting reinforcement system applicable to in - hole grouting of directional holes in coal mines as described in claim 1, characterized in that, a second valve is arranged on the second channel (4) of the pressure tee (3); a third valve is arranged on the third channel (7).

5. A grouting reinforcement system applicable to in - hole grouting of directional holes in coal mines as described in any one of claims 1 to 4, characterized in that, an elastic tightening ring (20) is arranged inside the rubber sleeve (12); the axis of the elastic tightening ring (20) coincides with the axis of the rubber sleeve (12); the elastic tightening ring (20) penetrates through the spherical protrusion (15).

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