A coal mine vertical shaft drilling quality protection method and mud flushing device

Abstract

The present invention relates to the technical field of vertical shaft drilling, and specifically to a method for protecting the quality of vertical shaft drilling in a coal mine and a mud flushing device, comprising a mud pump, a main pipe and a flushing pipe, wherein the mud pump is located in a mud pool, and the water outlet end of the mud pump is connected to the top of the main pipe through a slurry supply pipe, the main pipe penetrates a sealing plate and extends into the interior of the vertical shaft, the number of flushing pipes corresponds to the number of boreholes, and the flushing pipe adopts a hose, one end of the flushing pipe extends into the goaf, and the other end of the flushing pipe is communicated with the main pipe. The present invention lays a casing in the vertical shaft and a steel pipe in the borehole at the same time, so as to prevent the mud from directly contacting the inner wall of the borehole; and since the borehole is excavated from the bottom of the vertical shaft instead of from the ground, the borehole length is greatly shortened. Compared with the prior art, the present invention is conducive to reducing the probability of safety accidents and effectively ensuring the quality of the borehole.

Description

Technical Field

[0001] The invention relates to the technical field of vertical shaft drilling, in particular to a coal mine vertical shaft drilling quality protection method and a mud flushing device. Background Art

[0002] In the process of coal mining, it is inevitable that many goafs will be formed underground. The existence of goafs poses a great safety problem to the safe production of mines. People and machinery and equipment may fall into the goafs and get hurt. Therefore, in the process of coal mining, the treatment of goafs needs to be particularly cautious, and different treatment methods are also needed for different types of goafs.

[0003] At present, using mud to flush coal mine goaf is a common way of governance and reinforcement. Specifically, using mud to flush goaf has the following effects. First, mud can fill the cavities and gaps in the collapse zone, enhance the delayed compactness of the collapse zone, and improve the overall stiffness of the masonry structure of the original collapse zone. This can effectively eliminate the space for secondary deformation of the rock mass in the goaf, and prevent and slow down the flow of groundwater in the goaf; secondly, the cement and fly ash in the mud have a certain strength after solidification. After the goaf is filled and reinforced, the stability of the rock is enhanced and the bearing capacity of the foundation is improved; in addition, the mud can also form a thin and tough mud skin on the hole wall to protect the hole wall and prevent collapse.

[0004] In the prior art, since underground goafs are unevenly distributed and there are certain gaps between them, if a separate borehole is drilled above a goaf to reach the goaf for spraying mud, then since the underground goafs are not concentrated, it will inevitably cause waste of resources and increase costs; in addition, when mud enters the goaf through the borehole, and the borehole is long and narrow, the mud will inevitably impact the inner wall of the borehole when it flows in the borehole, which may cause the collapse of the borehole. In view of this, in order to safely and efficiently impact the goaf and reduce the probability of safety accidents, we propose a coal mine vertical shaft drilling quality protection method and a mud flushing device. Summary of the invention

[0005] The object of the present invention is to provide a method for protecting the quality of coal mine shaft drilling and a mud flushing device, so as to solve the problems raised in the above-mentioned background technology.

[0006] The present invention is realized by the following technical scheme: A method for protecting the quality of vertical shaft drilling in a coal mine, comprising the following steps:

[0007] S1. According to the location of the underground goaf, a flat area is selected in the middle of multiple goafs as the vertical shaft construction point;

[0008] S2. Use drilling equipment to drill downwards at the construction site of the vertical shaft, with the drilling depth ranging from one third to one half of the height difference between the ground and the goaf;

[0009] S3. After the drilling is completed, a hole is drilled at the bottom of the well toward the surrounding goaf until the hole is connected to the goaf;

[0010] S4. Lay a steel pipe in the borehole to prevent the borehole from collapsing, and lay a casing on the inner wall of the well, and set a sealing plate on the top of the casing;

[0011] S5. A mud pool is excavated at a suitable location on the ground, and then a diversion pipe is buried between the mud pool and the vertical shaft, with one end of the diversion pipe being located in the mud pool and the other end of the diversion pipe penetrating the side wall of the casing and extending into the casing;

[0012] S6. Use a mud flushing device to extract the mud in the mud pool and spray it into the goaf. After the mud flushes the goaf, it can carry the waste in the goaf upstream and finally flow back into the mud pool through the diversion pipe.

[0013] Optionally, the angle between the borehole and the vertical direction is not less than 60°, and the diameter of the borehole is not less than 1 meter.

[0014] Optionally, a circular hole is opened at the center of the sealing plate, and the circular hole is used for inserting a mud flushing device.

[0015] Optionally, a filter screen is provided in the mud pool, and the filter screen divides the internal space of the mud pool into a water storage chamber and a reflux chamber, and one end of the guide pipe extends into the reflux chamber.

[0016] The present invention also proposes a mud flushing device, which is suitable for the above-mentioned coal mine shaft drilling quality protection method, including a mud pump, a main pipe and a flushing pipe. The mud pump is located in a mud pool, and the water outlet end of the mud pump is connected to the top of the main pipe through a slurry supply pipe. The main pipe penetrates the sealing plate and extends into the interior of the shaft. The number of flushing pipes corresponds to the number of boreholes. The flushing pipe adopts a hose, one end of the flushing pipe extends into the goaf, and the other end of the flushing pipe is connected to the main pipe.

[0017] Optionally, a rotating tube is mounted on the outside of the main pipe, and the rotating tube and the main pipe are rotatably matched through bearings. A spiral driven auger is provided on the outside of the rotating tube, and a mounting frame is provided on the inner side of the bottom of the rotating tube. An active auger rod is vertically provided on the top of the mounting frame, and the active auger rod extends into the interior of the main pipe; when mud impacts the active auger rod from top to bottom, the rotating tube rotates clockwise, and the driven auger can drive the mud in the vertical shaft to move upward.

[0018] Optionally, a slurry discharge pipe is provided on the bottom wall of the screw-in pipe, a slurry collecting pipe is sleeved on the outside of the slurry discharge pipe, the slurry collecting pipe and the slurry discharge pipe are rotationally matched via a sealed bearing, and the flushing pipe is connected to the slurry collecting pipe.

[0019] Optionally, a bottom plate is provided under the slurry collecting pipe, the bottom plate is in contact with the bottom surface of the shaft, a limiting column is provided on the bottom surface of the bottom plate, the limiting column is inserted into the bottom of the shaft, a cross groove is provided on the upper surface of the bottom plate, and a cross block is provided at the bottom end of the slurry collecting pipe, and the cross block is embedded in the cross groove.

[0020] Optionally, a slurry outlet pipe corresponding to the flushing pipe is provided on the outer peripheral wall of the slurry collecting pipe, and one end of the flushing pipe is inserted into the slurry outlet pipe and fixedly connected thereto.

[0021] Optionally, the outside of the main pipe is protrudingly formed with an annular flange, and a guide hole is penetrated through the annular flange. The top surface of the sealing plate is provided with a guide column corresponding to the guide hole, the guide column penetrates the guide hole, and a locking nut is provided at the top of the guide column.

[0022] Compared with the prior art, the present invention provides a method for protecting the quality of coal mine shaft drilling and a mud flushing device, which has the following beneficial effects:

[0023] 1. The present invention lays casing in the shaft and steel pipe in the borehole at the same time, so as to prevent mud from directly contacting the inner wall of the borehole; and because the borehole is dug from the bottom of the shaft instead of from the ground, the length of the borehole is greatly shortened. Compared with the prior art, the present invention is conducive to reducing the probability of safety accidents and effectively ensuring the quality of the borehole;

[0024] 2. The present invention digs a vertical shaft in the middle of multiple goafs, and drills holes from the bottom of the vertical shaft to directly reach each goaf. Compared with the method of drilling holes directly from the ground, the present invention does not need to frequently move the drilling equipment, and also helps to reduce the drilling cost;

[0025] 3. The present invention uses a mud pump to extract the mud in the mud pool and sends the mud into each goaf through a flushing pipe, so each goaf can be operated synchronously, which greatly improves the operation efficiency. In addition, since the boreholes are inclined, it is also helpful to expand the spraying range of the mud;

[0026] 4. The present invention also has a rotary tube. Due to the impact of the mud, the rotary tube can be driven to rotate, which is conducive to the mud carrying the waste in the goaf to rise, thereby helping to prevent harmful substances in the waste from polluting groundwater resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the mud flushing device of the present invention;

[0029] Figure 3 It is a cross-sectional view of the mud flushing device of the present invention;

[0030] Figure 4 This is a schematic diagram of the main flow pipe structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the slurry discharge pipe structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the sealing plate structure of the present invention;

[0033] Figure 7 Based Figure 3 The corresponding figure at point A is enlarged.

[0034] In the figure: 100, casing; 200, sealing plate; 201, circular hole; 202, guide column; 203, locking nut; 300, mud pool; 301, filter screen; 400, guide pipe; 500, mud pump; 501, slurry supply pipe; 600, main pipe; 601, annular flange; 602, guide hole; 700, flushing pipe; 800, screw-in pipe; 801, driven auger; 802, mounting frame; 803, active auger rod; 804, slurry discharge pipe; 805, slurry collecting pipe; 806, slurry outlet pipe; 807, cross block; 900, bottom plate; 901, limit column; 902, cross groove. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figure 1 The present application embodiment proposes a method for protecting the quality of coal mine shaft drilling, comprising the following steps:

[0037] S1. According to the location of the underground goaf, a flat area is selected in the middle of multiple goafs as the vertical shaft construction point;

[0038] S2. Use drilling equipment to drill downwards at the construction site of the vertical shaft, with the drilling depth ranging from one third to one half of the height difference between the ground and the goaf;

[0039] S3. After the drilling is completed, a hole is drilled from the bottom of the well toward the surrounding goaf until the hole is connected to the goaf; specifically, the angle between the hole and the vertical direction is not less than 60°, and the diameter of the hole is not less than 1 meter;

[0040] S4. Laying a steel pipe in the borehole to prevent the borehole from collapsing, and laying a casing 100 on the inner wall of the borehole, and setting a sealing plate 200 on the top of the casing 100; specifically, the casing 100 is a steel pipe, and the top of the casing 100 extends above the ground;

[0041] S5. A mud pool 300 is excavated at a suitable location on the ground, and then a flow guide pipe 400 is buried between the mud pool 300 and the vertical shaft, wherein one end of the flow guide pipe 400 is located in the mud pool 300, and the other end of the flow guide pipe 400 penetrates the side wall of the casing 100 and extends into the casing 100;

[0042] S6. Use a mud flushing device to extract the mud in the mud pool 300 and spray it into the goaf. After the mud flushes the goaf, it can carry the waste in the goaf upstream and finally flow back into the mud pool 300 through the diversion pipe 400. A filter screen 301 is provided in the mud pool 300. The filter screen 301 divides the internal space of the mud pool 300 into a water storage chamber and a reflux chamber. One end of the diversion pipe 400 extends into the reflux chamber.

[0043] It is worth mentioning that after the mud flushes the goaf, the mud can carry the waste in the goaf upstream, and then flow into the reflux chamber through the guide pipe 400. After being filtered by the filter net 301, the waste is retained in the reflux chamber, and the liquid enters the water storage chamber, thus forming a cycle.

[0044] Example 2: Please refer to Figure 1-Figure 7 The embodiment of the present application proposes a mud flushing device, which is suitable for the coal mine vertical shaft drilling quality protection method in embodiment 1, including a mud pump 500, a mainstream pipe 600 and a flushing pipe 700, wherein the mud pump 500 is located in the mud pool 300, and the water outlet end of the mud pump 500 is connected to the top of the mainstream pipe 600 through the slurry supply pipe 501, the mainstream pipe 600 penetrates the sealing plate 200 and extends into the interior of the vertical shaft, the number of flushing pipes 700 corresponds to the number of boreholes, and the flushing pipe 700 adopts a hose, one end of the flushing pipe 700 extends into the goaf, and the other end of the flushing pipe 700 is communicated with the mainstream pipe 600; that is, the mud pump 500 can pump the mud in the mud pool 300 into the mainstream pipe 600, and finally send it into each goaf through the flushing pipe 700, thereby playing a flushing role.

[0045] It is worth mentioning that a circular hole 201 is opened at the center of the sealing plate 200 for inserting the main flow pipe 600, and the sealing plate 200 is connected to the top of the sleeve 100 by bolts, and the two are detachably fixedly connected.

[0046] Furthermore, the outside of the main pipe 600 is provided with a screw-in tube 800, and the screw-in tube 800 and the main pipe 600 are rotatably matched through bearings. The outside of the screw-in tube 800 is provided with a spiral driven auger 801, and the inner side of the bottom of the screw-in tube 800 is provided with a mounting frame 802, and the top of the mounting frame 802 is vertically provided with an active auger rod 803, and the active auger rod 803 extends into the interior of the main pipe 600; when the mud impacts the active auger rod 803 from top to bottom, under the impact of the liquid, the screw-in tube 800 rotates clockwise, and the driven auger 801 can drive the mud in the vertical shaft to move upward; it should be noted that the rotation of the driven auger 801 helps to drive the waste in the mud to rise.

[0047] Furthermore, a slurry discharge pipe 804 is provided on the bottom wall of the screw-in pipe 800, and a slurry collecting pipe 805 is mounted on the outside of the slurry discharge pipe 804. The slurry collecting pipe 805 and the slurry discharge pipe 804 are rotatably matched through a sealed bearing, and the flushing pipe 700 is connected to the slurry collecting pipe 805. A slurry outlet pipe 806 corresponding to the flushing pipe 700 is provided on the outer peripheral wall of the slurry collecting pipe 805, and one end of the flushing pipe 700 is inserted into the slurry outlet pipe 806 and fixedly connected thereto; specifically, the flushing pipe 700 and the slurry outlet pipe 806 are fixed by bolts, and the slurry outlet pipe 806 is a hard pipe.

[0048] Furthermore, a bottom plate 900 is provided below the slurry collecting pipe 805, and the bottom plate 900 is fitted with the bottom surface of the shaft. A limiting column 901 is also provided on the bottom surface of the bottom plate 900, and the limiting column 901 is inserted into the bottom of the shaft. A cross groove 902 is also provided on the upper surface of the bottom plate 900, and a cross block 807 is provided at the bottom end of the slurry collecting pipe 805, and the cross block 807 is embedded in the cross groove 902, so as to improve the stability of the slurry collecting pipe 805 and prevent it from shaking; an annular flange 601 is formed on the outside of the main flow pipe 600, and the annular flange 601 is located above the sealing plate 200, and a guide hole 602 is penetrated through the annular flange 601, and a guide column 202 corresponding to the guide hole 602 is provided on the top surface of the sealing plate 200, and the guide column 202 passes through the guide hole 602, and a locking nut 203 is provided at the top of the guide column 202, so as to fix the main flow pipe 600 and prevent it from shaking.

[0049] In summary, in the actual application of this embodiment, the mud pump 500 is used to extract the mud in the mud pool 300 and send the mud into the main pipe 600. Then the mud enters the goaf through the slurry discharge pipe 804, the slurry collection pipe 805 and the flushing pipe 700. After flushing the goaf, the mud can fill the cavities and gaps in the collapse zone, and can also form a thin and tough mud skin on the hole wall to protect the hole wall and prevent collapse. In addition, after the cement and fly ash in the mud are solidified, they can also reinforce the goaf. On the other hand, the mud can carry the waste in the goaf upward and finally flow back to the mud pool 300 through the guide pipe 400, thus forming a cycle. In addition, since the mud impacts the active auger rod 803 from top to bottom, it can carry the screw-in pipe 800 to rotate clockwise, and then under the action of the driven auger 801, it can drive the mud in the vertical shaft to move upward, thereby helping the waste in the mud to rise and prevent it from settling.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mud flushing device, characterized in that: It comprises a mud pump (500), a main flow pipe (600) and a flushing pipe (700), wherein the water outlet of the mud pump (500) is connected to the top of the main flow pipe (600) via a mud supply pipe (501), the main flow pipe (600) extends into the interior of the vertical shaft, the number of flushing pipes (700) corresponds to the number of boreholes, the flushing pipe (700) is a soft pipe, one end of the flushing pipe (700) extends into the goaf, and the other end of the flushing pipe (700) is in communication with the main flow pipe (600); The main flow pipe (600) is sleeved with a rotating tube (800) on its outside, and the rotating tube (800) and the main flow pipe (600) are rotatably matched via bearings, and a spiral driven auger (801) is provided on the outside of the rotating tube (800), and a mounting frame (802) is provided on the inner side of the bottom of the rotating tube (800), and an active auger rod (803) is vertically provided on the top of the mounting frame (802), and the active auger rod (803) extends into the main flow pipe (600); when mud impacts the active auger rod (803) from top to bottom, the rotating tube (800) rotates clockwise, and the driven auger (801) can drive the mud in the vertical shaft to move upward; A slurry discharge pipe (804) is provided on the bottom wall of the rotary inlet pipe (800), a slurry collection pipe (805) is sleeved on the outside of the slurry discharge pipe (804), the slurry collection pipe (805) and the slurry discharge pipe (804) are rotationally matched via a sealing bearing, and the flushing pipe (700) is connected to the slurry collection pipe (805); A bottom plate (900) is also provided below the slurry collecting pipe (805), the bottom plate (900) is in contact with the bottom surface of the shaft, a limiting column (901) is also provided on the bottom surface of the bottom plate (900), the limiting column (901) is inserted into the bottom of the shaft, a cross groove (902) is also provided on the upper surface of the bottom plate (900), a cross block (807) is provided at the bottom end of the slurry collecting pipe (805), and the cross block (807) is embedded in the cross groove (902); A slurry outlet pipe (806) corresponding one-to-one to the flushing pipe (700) is provided on the outer peripheral wall of the slurry collecting pipe (805), and one end of the flushing pipe (700) is inserted into the slurry outlet pipe (806) and fixedly connected thereto.

2. A method for protecting the quality of vertical shaft drilling in a coal mine, using the mud flushing device described in claim 1, characterized in that: The following steps are involved: S1. According to the location of the underground goaf, a flat area is selected in the middle of multiple goafs as the vertical shaft construction point; S2. Use drilling equipment to drill downwards at the construction site of the vertical shaft, with the drilling depth ranging from one third to one half of the height difference between the ground and the goaf; S3. After the drilling is completed, a hole is drilled at the bottom of the well toward the surrounding goaf until the hole is connected to the goaf; S4, laying a steel pipe in the borehole to prevent the borehole from collapsing, laying a casing (100) on the inner wall of the borehole, and setting a sealing plate (200) on the top of the casing (100); S5. A mud pool (300) is excavated at a suitable location on the ground, and then a flow guide pipe (400) is buried between the mud pool (300) and the vertical shaft, wherein one end of the flow guide pipe (400) is located in the mud pool (300), and the other end of the flow guide pipe (400) penetrates the side wall of the casing (100) and extends into the casing (100); S6. The mud in the mud pool (300) is extracted using a mud flushing device and sprayed into the goaf. After the mud flushes the goaf, it can carry the waste in the goaf upstream and finally flow back into the mud pool (300) through the guide pipe (400).

3. A method for protecting the quality of coal mine shaft drilling according to claim 2, characterized in that: The angle between the borehole and the vertical direction is not less than 60°, and the diameter of the borehole is not less than 1 meter.

4. A method for protecting the quality of coal mine shaft drilling according to claim 2, characterized in that: A circular hole (201) is provided at the center of the sealing plate (200), and the circular hole (201) is used for inserting a mud flushing device.

5. A method for protecting the quality of coal mine shaft drilling according to claim 2, characterized in that: A filter screen (301) is provided in the mud pool (300), and the filter screen (301) divides the internal space of the mud pool (300) into a water storage chamber and a reflux chamber, and one end of the guide pipe (400) extends into the reflux chamber.

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