Dredging device and dredging method for overlying strata separation drilling grouting pipe

Abstract

The invention provides an overlying strata separation drilling grouting pipe dredging device and method, the dredging device comprises a main body and cutting teeth, the appearance of the main body is of a cylindrical structure, the main body is internally provided with a straight screw hole section and a conical screw hole section, the straight screw hole section is located above the conical screw hole section, the straight screw hole section is communicated with the conical screw hole section, and the cutting teeth are arranged on the straight screw hole section. The straight screw hole section is suitable for being detachably connected with a dredging drill rod of a drilling machine through threads, and the conical screw hole section is of a conical structure with the narrow upper portion and the wide lower portion. The cutting teeth are fixedly connected to the bottom of the conical screw hole section, and the bottoms of the cutting teeth are provided with tips to cut blockages. The problem that the grouting pipe deforms in the foreign matter blockage dredging process of the overlying strata separation layer grouting pipe can be rapidly solved, the device is simple in structure, low in cost and easy to machine, dredging efficiency and construction quality can be improved, the treatment period of the foreign matter blockage accident of the grouting pipe is shortened, construction delay and cost increase caused by the accident are reduced, and the construction period is shortened. Therefore, the sinking reduction effect is effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of overburden rock separation layer grouting, and in particular to a device and a method for dredging overburden rock separation layer drilling grouting pipes. Background Art

[0002] After drilling a hole for grouting the overburden delamination, it is very easy to encounter blockage during the grouting process due to reasons such as ground movement and deformation, foreign matter blockage, grouting interruption, and misjudgment of grouting parameters. Since the grouting pipe has been inserted into the borehole, it may deform due to deformation of the surrounding ground, and its small inner diameter makes drilling and unblocking the hole very difficult. Problems such as the drill bit being unable to pass through the deformed area, the drill bit being stuck, and the drill bit breaking often occur. This not only affects the grouting construction progress, but also increases construction costs and safety risks. The traditional approach is to use a female or male cone to remove the drill tool for unblocking, but this has low efficiency and success rate, and the grouting pipe is also prone to deformation during the unblocking process. Summary of the Invention

[0003] The present invention aims to solve, at least to some extent, one of the technical problems in the related art. To this end, embodiments of the present invention provide a device and method for dredging grouting pipes in overburden separation layers, which can solve the problem of grouting pipe deformation during dredging caused by foreign matter blockage and improve dredging efficiency.

[0004] On one hand, an embodiment of the present invention proposes a device for clearing overburden delamination drilling and grouting pipes, comprising: a main body and cutting teeth, wherein the main body has a cylindrical structure, and the interior of the main body comprises a straight screw hole section and a conical screw hole section, the straight screw hole section is located above the conical screw hole section, the axis of the straight screw hole section is collinear with the axis of the conical screw hole section, the straight screw hole section is connected to the conical screw hole section, the straight screw hole section is suitable for being detachably connected to the clearing drill rod of the drilling rig through a thread, and the conical screw hole section is a conical structure that is narrow at the top and wide at the bottom; the cutting teeth are fixedly connected to the bottom of the conical screw hole section, and the bottom of the cutting teeth has a pointed end for cutting blockages.

[0005] In some embodiments, a plurality of water guide holes are provided on the side wall of the main body.

[0006] In some embodiments, a transition section is provided between the straight screw hole section and the tapered screw hole section, and the inner wall of the transition section is smooth.

[0007] In some embodiments, the water guide hole includes a horizontal hole and an inclined hole. The horizontal hole is opened near the middle of the side wall of the conical screw hole section, the upper end of the inclined hole is located on the inner wall of the transition section, and the lower end of the inclined hole is located near the lower part of the outer wall of the conical screw hole section.

[0008] In some embodiments, a plurality of cutting teeth are evenly arranged along the edge of the bottom of the main body.

[0009] In some embodiments, the cutting teeth are made of cemented carbide.

[0010] Another embodiment of the present invention provides a method for clearing a grouting pipe in a borehole in an overburden separation layer, using the above-mentioned clearing device, comprising the following steps:

[0011] Connect the straight screw hole section of the main body to the top of the dredging drill rod through threads and tighten them;

[0012] The dredging device is lowered to the blockage in the grouting pipe through the dredging drill rod, and the driving mechanism of the dredging drill rod is started to drive the dredging drill rod and the dredging device to rotate synchronously. The dredging device continuously squeezes the blockage while rotating, and the cutting teeth grind the blockage;

[0013] As the volume of the blockage gradually decreases, the blockage gradually gets stuck in the tapered screw hole section of the main body and is tightly wrapped. The dredging drill rod is pulled upward and out of the grouting pipe, and the blockage is then brought out of the grouting pipe, and the grouting pipe is restored to normal operation.

[0014] In some embodiments, the dredging drill rod has an injection channel. The injection channel of the dredging drill rod is connected to a grouting pump or an air compressor. After the blockage is brought out of the grouting pipe, the dredging device is lowered to the bottom of the grouting pipe again, the grouting pump or air compressor is turned on, and pressurized water is injected into the grouting pipe through the injection channel. Through the impact of the pressurized water, the cut debris is discharged upward from the annular gap between the drill rod and the grouting pipe into the grouting pipe.

[0015] In some embodiments, while the cutting teeth are grinding the blockage, the grouting pump or the air compressor is turned on, and pressurized water is injected into the grouting pipe through the injection channel. Through the impact of the pressurized water, the cut debris is discharged upward from the annular gap between the drill rod and the grouting pipe into the grouting pipe.

[0016] In some embodiments, a plurality of water guide holes are opened on the side wall of the main body, and the injection channel of the drill rod is connected to the water guide holes. Pressurized water is introduced into the grouting pipe through the water guide holes to flush the cut chips and cool the main body and the grouting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings.

[0018] in:

[0019] Figure 1 Schematic diagram of the external structure of the overburden rock separation layer drilling grouting pipe dredging device in an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A longitudinal cross-sectional view of

[0021] Figure 3 Schematic diagram of the internal three-dimensional structure of the overburden rock separation layer drilling grouting pipe dredging device in an embodiment of the present invention;

[0022] Figure 4 Flow chart of a method for clearing a grouting pipe in a drilling hole of an overburden separation layer according to an embodiment of the present invention;

[0023] Figure 5 Schematic diagram of a method for clearing a grouting pipe in a drilling hole in an overburden separation layer according to an embodiment of the present invention;

[0024] Reference numerals:

[0025] 1. Main body; 2. Straight screw hole section; 3. Tapered screw hole section; 4. Cutting teeth; 5. Inclined hole; 6. Horizontal hole; 7. Grouting pump; 8. Grouting pipeline; 9. Valve; 10. Ventilation pipeline; 11. Air compressor; 12. Grouting pipe; 13. Dredging drill rod; 14. Dredging device. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0027] The following describes a device and method for dredging a grouting pipe in a stratum-overburden separation borehole according to an embodiment of the present invention with reference to the accompanying drawings.

[0028] like Figure 1-3 As shown, an embodiment of the present invention proposes a device for clearing overburden delamination drilling and grouting pipes, comprising: a main body 1 and cutting teeth 4. The main body 1 has a cylindrical shape, and the interior of the main body 1 is provided with a straight screw hole section 2 and a conical screw hole section 3. The straight screw hole section 2 is located above the conical screw hole section 3, and the axis of the straight screw hole section 2 is collinear with the axis of the conical screw hole section 3. The straight screw hole section 2 is connected to the conical screw hole section 3, and the straight screw hole section 2 is suitable for being detachably connected to the clearing drill rod 13 of the drilling rig through a thread, and the conical screw hole section 3 is a conical structure that is narrow at the top and wide at the bottom; the cutting teeth 4 are fixedly connected to the bottom of the conical screw hole section 3, and the bottom of the cutting teeth 4 has a pointed end to cut the blockage.

[0029] The dredging device 14 of the embodiment of the present invention can quickly resolve the problem of grouting pipe deformation during the dredging process of foreign matter blockage in overburden delamination grouting pipes. The device has a simple structure, low cost, and is easy to process. It can improve dredging efficiency and construction quality, shorten the processing cycle of grouting pipe foreign matter blockage accidents, reduce construction delays and cost increases caused by accidents, and thus effectively ensure the subsidence reduction effect. It provides strong support for the maintenance and care of various grouting pipes. It can reduce dredging costs while ensuring the dredging effect, providing a more efficient and economical solution for handling overburden delamination grouting drilling accidents.

[0030] By setting the straight screw hole section 2 as the key part connected to the dredging drill rod 13, it plays a good docking and transition role, ensuring that the dredging device 14 can be stably connected to the dredging drill rod 13, providing a basis for subsequent dredging work.

[0031] By providing the tapered screw hole section 3, the blockage inside the grouting pipe 12 can be firmly grasped by pressing down and rotating, and the blockage can be gradually removed and cleared.

[0032] By setting the cutting teeth 4, the rotation of multiple cutting teeth 4 can quickly grind the blockage, making it easier for the subsequent cone screw hole section 3 to remove the blockage, while expanding the inner diameter of the deformed part of the grouting pipe 12 to achieve a thorough dredging effect.

[0033] In some embodiments, a plurality of water guide holes are provided on the side wall of the main body 1 .

[0034] By providing the water guide holes, high-pressure water, flushing fluid or other media (such as high-pressure gas) can be promptly guided to the part that needs to be dredged during the dredging process. The water guide holes can discharge the fine chips after cutting and can also cool the entire dredging device 14 and the grouting pipe 12. This helps to improve the dredging efficiency and prevent the dredging device 14 or the grouting pipe 12 from being damaged by factors such as high temperature.

[0035] In some embodiments, a transition section is provided between the straight screw hole section 2 and the tapered screw hole section 3, and the inner wall of the transition section is smooth. By providing the transition section, on the one hand, the distance of the threaded connection of the drill rod 13 can be limited, and on the other hand, it is convenient to open the water guide hole.

[0036] In some embodiments, the water guide hole includes a horizontal hole 6 and an inclined hole 5. The horizontal hole 6 is opened near the middle of the side wall of the conical screw hole section 3, the upper end of the inclined hole 5 is located on the inner wall of the transition section, and the lower end of the inclined hole 5 is located near the lower part of the outer wall of the conical screw hole section 3.

[0037] By providing the horizontal hole 6, the debris in the annular gap between the grouting pipe 12 and the dredging device 14 can be flushed. By providing the inclined hole 5, the debris at the bottom of the grouting pipe 12 can be flushed and discharged upward from the borehole through the annular gap between the borehole and the grouting pipe 12. In addition, the injected high-pressure liquid can be prevented from flowing back, thereby preventing the debris of the blockage from being brought into the water guide hole and causing blockage.

[0038] Furthermore, the horizontal holes 6 and the inclined holes 5 are evenly arranged in a circle along the horizontal direction. Liquid can be injected from all directions of the grouting pipe 12.

[0039] In some embodiments, a plurality of cutting teeth 4 are evenly arranged along the edge of the bottom of the main body 1 .

[0040] In some embodiments, the cutting teeth 4 are made of cemented carbide. With their high hardness and sharp cutting edges, the cutting teeth 4 can effectively cut and remove impurities, agglomerates, and other blockages at the deformed portion of the grouting pipe 12. Since the material is cemented carbide, the cutting teeth 4 can also cut blockages made of metal materials such as drilling tools and drill bits.

[0041] like Figure 4 、 5 As shown, another embodiment of the present invention provides a method for clearing a grouting pipe in a borehole of an overburden separation layer, using the above-mentioned clearing device 14, including the following steps:

[0042] S1. Carefully inspect all components of the dredging device 14 and the dredging drill rod 13 to ensure they are intact and functioning properly. Then, use specialized connection tools to precisely connect and tighten the straight screw hole section 2 of the main body 1 to the top of the dredging drill rod 13 through threads to ensure they will not separate during subsequent operations, laying a solid foundation for subsequent dredging work.

[0043] S2. After confirming that the dredging device 14 is correctly connected to the dredging drill rod 13, the dredging device 14 is slowly lowered to the blockage in the grouting pipe 12 through the driving mechanism of the dredging drill rod 13. During the lowering process, pay close attention to the lowering speed and depth to ensure that the dredging device 14 can accurately reach the designated position and prepare for subsequent grinding and milling processing.

[0044] S3. Start the driving mechanism of the dredging drill rod 13, driving the dredging drill rod 13 and the dredging device 14 to rotate synchronously. The dredging device 14 continuously squeezes the blockage while rotating, and the cutting teeth 4 grind the blockage. During the grinding process, the grinding force and speed should be controlled according to the specific conditions of the grouting pipe 12 to avoid unnecessary damage to the grouting pipe 12.

[0045] S4. As the volume of the blockage gradually decreases, the blockage gradually gets stuck in the tapered screw hole section 3 of the main body 1 and is tightly wrapped. The dredging drill rod 13 is pulled upward and out of the grouting pipe 12. The blockage then smoothly passes through the deformed section of the grouting pipe 12 and is finally brought out of the grouting pipe 12. The blockage in the grouting pipe 12 is quickly cleared, the grouting pipe 12 is unobstructed, and the grouting operation can be resumed.

[0046] It should be noted that since the blockage is usually located at the diameter change point of the grouting pipe 12, that is, the upper section of the grouting pipe 12 is narrow and the lower section is wide, the blockage is stuck at the diameter change point and cannot fall. At this time, the blockage can be ground using the present dredging device 14. After it is ground to a size that can be placed in the tapered screw hole section 3, the dredging device 14 is rotated and squeezed downward at the same time to get the blockage stuck in the tapered screw hole section 3 and then taken out of the grouting pipe 12.

[0047] Things to note during operation include:

[0048] 1. During the entire process of dredging the grouting pipe 12, it is necessary to strictly follow the operating specifications and safety requirements to ensure the safety of the operators and the quality of the dredging work.

[0049] 2. The dredging process should be recorded and monitored in detail to provide a reference for the subsequent dredging of the grouting pipe 12.

[0050] 3. Carefully inspect all components of the dredging device 14 and the dredging drill rod 13 to ensure they are intact and functioning properly. Use a suitable wrench to tighten the connections to ensure they are tight, to avoid loosening during the dredging process, which could lead to safety accidents or poor dredging results.

[0051] 4. Pay close attention to the lowering speed and depth of the dredging device 14. During the lowering process, the grouting pump 7 or air compressor 11 should be turned on to flush the slurry in the hole to prevent the dredging device 14 from being blocked or stuck. Ensure that the dredging device 14 can accurately reach the designated position and avoid lowering it too quickly or too deep, which may cause unnecessary damage to the grouting pipe 12 or block the dredging device 14. If a blockage is encountered or the grouting pipe 12 is severely deformed, the lowering should be stopped immediately and appropriate treatment measures should be taken.

[0052] 5. When the cutting teeth 4 of the dredging device 14 are milling the blocked area of ​​the grouting pipe 12, a trial milling can be performed with a smaller milling force and speed first. The water return in the annular gap between the dredging drill rod 13 and the grouting pipe 12 is observed in real time to check whether there is slurry or debris returning. The reaction of the grouting pipe 12 and the milling effect are also checked. Then, the milling force and speed can be gradually adjusted according to the actual situation. At the same time, the operation of the driving mechanism of the dredging drill rod 13 should be observed carefully, such as whether there is any abnormal vibration or noise. If any abnormality is found, the machine should be stopped and inspected in time.

[0053] 6. When using the taper screw hole segment 3, pay attention to its matching accuracy and linkage performance with the cutting teeth 4 to ensure that they can work together to achieve the best unblocking effect. At the same time, pay attention to the gripping force and gripping range of the taper screw hole segment 3 to avoid damaging the taper screw hole segment 3 due to excessive gripping force.

[0054] 7. During the dredging process of the grouting pipe 12, it is necessary to strictly abide by the operating procedures, pay attention to the details and safety matters of each link, and ensure the smooth progress of the dredging work and the normal use of the grouting pipe 12.

[0055] In some embodiments, in step S4, the drill rod 13 is unblocked with an injection channel, and the injection channel of the unblocked drill rod 13 is connected to the grouting pump 7 or the air compressor 11. After the blockage is brought out of the grouting pipe 12, the unblocking device 14 is lowered to the bottom of the grouting pipe 12 again, the grouting pump 7 or the air compressor 11 is turned on, and pressurized water is injected into the grouting pipe 12 through the injection channel. Through the impact of the pressurized water flow, the cut debris is discharged upward from the annular gap between the drill rod and the grouting pipe 12 into the grouting pipe 12.

[0056] Furthermore, the grouting pump 7 is connected to the grouting pipe 12 through the grouting pipeline 8, and the air compressor 11 is connected to the grouting pipe 12 through the ventilation pipeline 10. Valves 9 are respectively connected to the grouting pipeline 8 and the ventilation pipeline 10.

[0057] In some embodiments, in step S3, the injection channel of the unblocked drill rod 13 is connected to the grouting pump 7 or the air compressor 11. During the process of the cutting teeth 4 grinding the blockage, the grouting pump 7 or the air compressor 11 is turned on, and pressurized water is injected into the grouting pipe 12 through the injection channel. Through the impact of the pressurized water, the cut debris is discharged upward from the annular gap between the unblocked drill rod 13 and the grouting pipe 12 to the grouting pipe 12.

[0058] It should be noted that during the operation, it is necessary to observe the return water situation of the annular gap between the drill rod 13 and the grouting pipe 12 in real time to check whether there is slurry or debris returning. During the milling process, the milling force and speed should be controlled according to the return water situation of the annular gap between the drill rod 13 and the grouting pipe 12 to avoid unnecessary damage to the grouting pipe 12.

[0059] In some embodiments, a plurality of water guide holes are opened on the side wall of the main body 1, and the injection channel of the drill rod 13 is connected to the water guide holes. Pressurized water flow is introduced into the grouting pipe 12 through the water guide holes to flush the cut chips and cool the main body 1 and the grouting pipe 12.

[0060] The present invention is further described below through specific examples.

[0061] Example 1

[0062] like Figure 4 、 5 As shown, a method for clearing a grouting pipe in a drilling hole in an overburden separation layer comprises the following steps:

[0063] S1. Carefully check the various components of the dredging device 14 and the dredging drill rod 13 to ensure that they are intact and functioning properly. Then, use professional connection tools and techniques to connect and tighten the straight screw hole section 2 of the main body 1 to the top of the dredging drill rod 13.

[0064] S2. By unblocking the driving mechanism of the drill rod 13, the unblocking device 14 is slowly lowered to the blocked or deformed part of the grouting pipe 12. During the lowering process, the grouting pump 7 needs to be turned on to flush the slurry in the hole to prevent the unblocking device 14 from being blocked or stuck. During the lowering process, the lowering speed and depth should also be closely monitored to ensure that the unblocking device 14 can accurately reach the designated position and prepare for the subsequent milling process.

[0065] S3, start the driving mechanism of the dredging drill rod 13, and drive the dredging device 14 to start operation through a specific transmission system. When the cutting teeth 4 of the dredging device 14 are milling the blocked part of the grouting pipe 12, a trial milling can be performed with a smaller milling force and speed first, and the return water situation of the annular gap between the dredging drill rod 13 and the grouting pipe 12 is observed in real time to check whether there is slurry or iron filings returning, and to check the reaction and milling effect of the grouting pipe 12, and then gradually adjust the milling force and speed according to the actual situation. At the same time, it is necessary to pay attention to the operation of the driving mechanism of the dredging drill rod 13, such as whether there are abnormal vibrations, noises, etc. If there are any abnormalities, the machine should be stopped and checked in time. During the grinding process, the grinding force and speed should be controlled according to the specific situation of the grouting pipe 12 to avoid causing unnecessary damage to the grouting pipe 12.

[0066] The cone screw hole section 3 of the dredging device 14 can realize the linkage effect with the alloy cutting teeth 4. When the cutting teeth 4 grind the hard blockage in the grouting pipe 12, the dredging device 14 is gradually pressed down.

[0067] S4. As the volume of the blockage gradually decreases, the blockage gradually gets stuck in the tapered screw hole section 3 of the main body 1 and is tightly wrapped. The tapered screw hole section 3 grabs the blockage in the grouting pipe 12 and takes it out, completely clearing the blockage in the grouting pipe 12 and restoring the grouting pipe 12 to a normal unobstructed state.

[0068] S5. After the grouting pipe 12 is unblocked, the grouting pump 7 can be used to pressurize the grouting pipe 12 with a small flow rate, accurately controlling the flow rate and pressure of the pressurized water. When the amount of water pressed in is greater than the volume in the hole, the flow rate of the grouting pump 7 can be gradually increased. It is particularly important to note that the pressurized water pressure cannot exceed the grouting design pressure. When the pressurized water pressure exceeds the grouting design pressure, first stop pressurizing the water and close the valve 9 until the hole pressure drops below the pressure of the nearby grouting holes, and repeat the above steps. When the pressurized water pressure meets the grouting timing, gradually resume grouting.

[0069] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0071] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0072] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0073] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0074] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A device for dredging grouting pipes in overburden separation layers, characterized in that: include: The main body has a cylindrical shape, and has a straight screw hole section and a tapered screw hole section inside the main body. The straight screw hole section is located above the tapered screw hole section, and the axis of the straight screw hole section is collinear with the axis of the tapered screw hole section. The straight screw hole section is connected to the tapered screw hole section, and the straight screw hole section is suitable for being detachably connected to the dredging drill rod of the drilling rig through a thread. The tapered screw hole section has a conical structure that is narrow at the top and wide at the bottom. The cutting teeth are fixedly connected to the bottom of the tapered screw hole section, and the bottom of the cutting teeth has a tip for cutting blockages.

2. The overburden separation layer drilling grouting pipe dredging device according to claim 1 is characterized in that: The side wall of the main body is provided with a plurality of water guide holes.

3. The overburden separation layer drilling grouting pipe dredging device according to claim 2 is characterized in that: A transition section is provided between the straight screw hole section and the tapered screw hole section, and the inner wall of the transition section is smooth.

4. The overburden separation layer drilling grouting pipe dredging device according to claim 3 is characterized in that: The water guide hole includes a horizontal hole and an inclined hole. The horizontal hole is opened near the middle of the side wall of the conical screw hole section, the upper end of the inclined hole is located on the inner wall of the transition section, and the lower end of the inclined hole is located near the lower part of the outer wall of the conical screw hole section.

5. The overburden separation layer drilling grouting pipe dredging device according to claim 1 is characterized in that: A plurality of cutting teeth are evenly arranged along the edge of the bottom of the main body.

6. The overburden separation layer drilling grouting pipe dredging device according to claim 1 is characterized in that: The material of the cutting teeth is hard alloy.

7. A method for clearing a grouting pipe in a stratum of overburden, characterized in that: The dredging device according to any one of claims 1 to 6 comprises the following steps: Connect the straight screw hole section of the main body to the top of the dredging drill rod through threads and tighten them; The dredging device is lowered to the blockage in the grouting pipe through the dredging drill rod, and the driving mechanism of the dredging drill rod is started to drive the dredging drill rod and the dredging device to rotate synchronously. The dredging device continuously squeezes the blockage while rotating, and the cutting teeth grind the blockage; As the volume of the blockage gradually decreases, the blockage gradually gets stuck in the tapered screw hole section of the main body and is tightly wrapped. The dredging drill rod is pulled upward and out of the grouting pipe, and the blockage is then brought out of the grouting pipe, and the grouting pipe is restored to normal operation.

8. The method for clearing the overburden separation layer drilling grouting pipe according to claim 7, characterized in that: There is an injection channel in the unblocking drill rod. The injection channel of the unblocking drill rod is connected to the grouting pump or air compressor. After the blockage is brought out of the grouting pipe, the unblocking device is lowered to the bottom of the grouting pipe again, the grouting pump or the air compressor is turned on, and pressurized water is injected into the grouting pipe through the injection channel. Through the impact of the pressurized water flow, the cut debris is discharged upward from the annular gap between the drill rod and the grouting pipe into the grouting pipe.

9. The method for clearing the overburden separation layer drilling grouting pipe according to claim 8, characterized in that: During the process of the cutting teeth grinding the blockage, the grouting pump or the air compressor is turned on, and pressurized water is injected into the grouting pipe through the injection channel. The impact of the pressurized water flow discharges the cut debris upward from the annular gap between the drill rod and the grouting pipe.

10. The method for clearing the overburden separation layer drilling grouting pipe according to claim 9, characterized in that: The side wall of the main body is provided with a plurality of water guide holes, and the injection channel for dredging the drill rod is connected to the water guide holes. Pressurized water is introduced into the grouting pipe through the water guide holes to flush the cut chips and cool the main body and the grouting pipe.

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