Hole collapse prevention device and use method

Abstract

The invention relates to the technical field of coal seam gas extraction, in particular to a hole collapse prevention device which comprises a supporting pipe and an auxiliary supporting assembly, the supporting pipe is an elastic hard pipe, two vertical parallel guide rails are arranged on the inner wall of the supporting pipe, and the auxiliary supporting assembly comprises a supporting rod and a telescopic adjusting rod which are rotationally connected in a cross shape. The outer end of the telescopic adjusting rod penetrates through the supporting pipe, the two ends of the supporting rod are slidably connected with the two guide rails respectively, and anti-skid lines are arranged on the outer wall of the supporting pipe and correspondingly arranged on the outer sides of the guide rails. The using method comprises the following steps: A1, a pipe feeding process; a2, a supporting process. In the lowering process, the supporting pipe can be oblate, the long diameter of the supporting pipe is smaller than the inner diameter of a drill hole, and therefore the supporting pipe can be smoothly lowered into the drill hole. After reaching a preset position, the device can be quickly changed into a circle and tightly support a hole wall through the adjustment of the internal auxiliary support assembly, so that the device perfectly adapts to the actual size of a drilled hole, and the installation process is simple and quick.

Description

Technical Field

[0001] This invention relates to the field of coal seam gas extraction technology, specifically to an anti-collapse hole device and its usage method. Background Technology

[0002] In coal seam gas drainage projects, support devices are typically used to reinforce the borehole walls to prevent collapse during construction or use. Traditional support methods often employ rigid casing or grouting reinforcement, which suffer from problems such as complex construction, high cost, and poor adaptability. Especially in soft, fractured coal seams, boreholes are highly susceptible to instability and collapse, preventing the smooth lowering of gas drainage pipelines or causing them to deform under pressure during use, severely impacting drainage efficiency and safety.

[0003] Existing technologies also include some retractable or adjustable support devices, but their structures are often complex, making installation and operation in narrow boreholes inconvenient. Furthermore, their stability and fit after installation are insufficient, making them difficult to adapt to different borehole diameters and geological variations. In addition, many devices lack effective anti-slip and anchoring mechanisms, making them prone to displacement under coal seam stress or vibration, leading to support failure.

[0004] Therefore, there is an urgent need in this field for a simple, easy-to-install, and robust anti-collapse device that can adapt to the borehole wall to solve the technical problems of easy collapse and unsustainable support effect in coal seam gas drainage boreholes. Summary of the Invention

[0005] To address the above problems, the present invention provides an anti-collapse hole device and a method of use.

[0006] The technical solution adopted by the present invention to solve its technical problem is: an anti-collapse hole device, including a support pipe and an auxiliary support assembly. The support pipe is an elastic rigid pipe. The inner wall of the support pipe is provided with two vertically parallel guide rails. The auxiliary support assembly includes a support rod and a telescopic adjustment rod that are rotatably connected in a cross shape. The outer end of the telescopic adjustment rod passes through the support pipe. The two ends of the support rod are slidably connected to the two guide rails respectively. The outer wall of the support pipe is provided with anti-slip textures, which are correspondingly provided on the outer side of the guide rails. During installation, the support pipe is lowered into the borehole in a flat, round shape. The support rod serves as the short diameter of the support pipe, and the telescopic adjustment rod serves as the long diameter of the support pipe. At this time, the length of the telescopic adjustment rod is less than the inner diameter of the borehole. In the support state, the support rod moves along the guide rail and converts to the long diameter of the support pipe. The anti-slip texture abuts against the inner wall of the borehole, and the telescopic adjustment rod extends, with its outer end penetrating the inner wall of the borehole.

[0007] As an optimization, at least two sets of auxiliary support components are provided inside the support tube, and the support tube is an elastic metal tube or a rigid silicone tube.

[0008] As an optimization, the telescopic adjustment rod includes a fixed section and two adjustment sections. The fixed section is rotatably connected to the support rod, and the two adjustment sections are slidably connected to both ends of the fixed section. An adjustment electromagnet is provided inside the fixed section, and a support spring is connected to both ends of the adjustment electromagnet. A magnetic block is provided at one end of the adjustment section connected to the fixed section. When the adjustment electromagnet is energized, the magnetic block is pushed outward along the length of the fixed section by magnetic force, so that the adjustment section is inserted into the inner wall of the borehole.

[0009] As an optimization, a sleeve is provided in the middle of the support rod, the sleeve is rotatably disposed in the middle of the telescopic adjustment rod, and connecting sliders are connected to both ends of the support rod, the connecting sliders being slidably connected to the guide rail.

[0010] As an optimization, it also includes operating rods. Each section of the support pipe is equipped with two operating rods. The upper end of the operating rod is provided with a connecting screw hole, and the lower end of the operating rod is a connecting screw end. The connecting screw end is connected to the connecting screw hole of the adjacent operating rod on the lower side. Both the upper and lower parts of the support rod are equipped with connecting rings. The outer periphery of the operating rod is provided with a threaded section. The connecting ring is sleeved on the outside of the threaded section. The threaded section is equipped with at least two positioning nuts, which are respectively located on the upper and lower sides of the connecting ring to lock and position the connecting ring and the operating rod.

[0011] As an optimization, the connecting slider and the support rod are rotatably connected.

[0012] As an optimization, the anti-slip texture is a vertically distributed, densely packed anti-slip horizontal texture.

[0013] A method of using an anti-collapse hole device includes the following steps: A1. Pipe lowering process: The support rod is pushed along the guide rail by the operating rod, so that the vertical projection length of the support rod is less than the retracted length of the telescopic adjustment rod. The support rod is the short diameter of the support pipe and the telescopic adjustment rod is the long diameter of the support pipe. The support pipe is lowered into the borehole and the operating rods of adjacent support pipes are connected. A2. Support process: Adjust the angle of the support rod by operating the lever to make the support rod horizontally open, and the anti-slip texture tightly fits against the inner wall of the borehole. When the electromagnet is energized, the telescopic adjustment rod is opened outward and the outer end of the telescopic adjustment rod is pressed tightly against the borehole.

[0014] As an optimization, during the pipe lowering process in step A1, the top view of the support pipe is flat and round, and at this time the long diameter of the support pipe is smaller than the inner diameter of the borehole. During the support process in step A2, the support rod serves as the long diameter of the support pipe, and the long diameter is equal to the inner diameter of the borehole.

[0015] The beneficial effects of this plan are as follows: The support pipe uses a flexible rigid pipe (such as a flexible metal pipe or a rigid silicone pipe) and is designed with a deformable structure. During the lowering process, the support pipe can be flattened into a round shape, making its long diameter smaller than the inner diameter of the borehole, thus allowing it to be smoothly lowered into the borehole. After reaching the predetermined position, it can be quickly transformed into a round shape and tightened against the borehole wall by adjusting the internal auxiliary support components, perfectly adapting to the actual size of the borehole. The installation process is simple and fast. The device achieves flexible switching between long and short diameter support pipes and strong support through the cross-shaped rotating connection and role switching of the "support rod" and "telescopic adjustment rod". In the support state, the support rod moves and expands along the guide rail as the long diameter, while the telescopic adjustment rod (especially its adjustment section) extends outward under electromagnetic drive. Its outer end can directly penetrate into the borehole wall. Combined with the anti-slip texture (such as vertically dense anti-slip horizontal texture) on the outer wall of the support pipe, it abuts against the borehole wall, forming multi-point and multi-directional mechanical anchoring and friction locking, which greatly enhances the integrity and anti-displacement ability of the support and effectively prevents slippage or deformation under coal seam stress. The telescopic adjustment rod uses an electromagnetic drive (the adjustment electromagnet pushes the adjustment section with a magnetic block), achieving precise and rapid non-contact telescopic control with quick response and controllable force. The support rod and operating rod, through the cooperation of threaded sections, positioning nuts, and connecting rings, can achieve precise angle fixing and position locking, ensuring long-term stability of the support structure. Attached Figure Description

[0016] Figure 1 This is an isometric view of the present invention.

[0017] Figure 2 This is a top view of the present invention.

[0018] Figure 3 This is a schematic diagram of the main view of the present invention.

[0019] Figure 4 For the present invention Figure 3 A schematic diagram of the AA cross-section structure.

[0020] Figure 5 This is a schematic diagram of the left side of the present invention.

[0021] Figure 6 For the present invention Figure 5 A schematic diagram of the BB cross-section structure.

[0022] Figure 7 This is a schematic diagram of the connection structure of the auxiliary support component of the present invention.

[0023] Figure 8 This is a schematic diagram of the auxiliary support component of the present invention from an isometric perspective.

[0024] The components are: 1. support pipe, 2. guide rail, 3. support rod, 4. anti-slip texture, 5. fixed section, 6. adjusting section, 7. adjusting electromagnet, 8. support spring, 9. connecting slider, 10. operating rod, 11. connecting ring, and 12. positioning nut. Detailed Implementation

[0025] like Figures 1-8 As shown, an anti-collapse hole device includes a support pipe 1 and an auxiliary support assembly. The support pipe 1 is an elastic rigid pipe. The inner wall of the support pipe 1 is provided with two vertically parallel guide rails 2. The auxiliary support assembly includes a support rod 3 and a telescopic adjustment rod that are rotatably connected in a cross shape. The outer end of the telescopic adjustment rod passes through the support pipe 1. The two ends of the support rod 3 are slidably connected to the two guide rails 2 respectively. The outer wall of the support pipe 1 is provided with anti-slip textures 4, which are correspondingly provided on the outer side of the guide rails 2. During installation, the support pipe 1 is lowered into the borehole in a flat, round shape. The support rod 3 serves as the short diameter of the support pipe 1, and the telescopic adjustment rod serves as the long diameter of the support pipe 1. At this time, the length of the telescopic adjustment rod is less than the inner diameter of the borehole. In the support state, the support rod 3 moves along the guide rail 2 and converts to the long diameter of the support pipe 1. The anti-slip texture 4 abuts against the inner wall of the borehole, the telescopic adjustment rod extends, and the outer end of the telescopic adjustment rod is inserted into the inner wall of the borehole.

[0026] The support pipe 1, serving as the main load-bearing and sealing structure, is key to achieving the transformation from "flattened oval lowering to circular support" due to its "elastic rigid pipe" characteristic. The guide rail 2 provides a precise linear constraint path for the movement of internal components, ensuring the direction of movement of the support rod 3. The auxiliary support assembly (support rod 3 and telescopic adjustment rod) is the driving and locking mechanism; its "cross-shaped rotating connection" is the mechanical basis for achieving the interchangeability of long and short diameters. The anti-slip texture 4 is a surface treatment that increases friction and prevents circumferential slippage.

[0027] The support pipe 1 can be made of 65Mn spring steel strip rolled and heat treated, which has both high elasticity and sufficient rigidity; or it can be made of polyurethane reinforced rigid composite material pipe, which is wear-resistant, corrosion-resistant and lightweight.

[0028] The guide rail 2 can be designed as a grooved or raised track made of stainless steel (such as 304 or 316) to cooperate with the connecting slider 9. It needs to be surface hardened to reduce wear.

[0029] Anti-slip texture 4 can be formed on the outer wall of the pipe with a depth of 0.5-1.5mm using knurling or molding processes to "bite" into the soil and rock of the hole wall when radially tightened.

[0030] like Figure 4 As shown, at least two sets of auxiliary support components are provided inside the support pipe 1, and the support pipe 1 is an elastic metal pipe or a rigid silicone pipe.

[0031] At least two sets of auxiliary support components are used to ensure that the support pipe 1 has multiple support points in the length direction, to prevent the support pipe 1 from bending due to unstable support, to form multi-point anchoring, and to improve the uniformity and reliability of the overall support.

[0032] Besides spring steel, flexible metal tubing can also be made of titanium alloys (such as TC4), which offer high strength, light weight, and corrosion resistance, making them suitable for deep holes or corrosive environments. Rigid silicone tubing can be made of industrial-grade silicone rubber with a Shore hardness between 80A and 95A. Aramid fibers or steel wire braids can be laid inside the silicone to enhance compressive and tear resistance.

[0033] like Figure 4 As shown, the telescopic adjustment rod includes a fixed section 5 and two adjustment sections 6. The fixed section 5 is rotatably connected to the support rod 3, and the two adjustment sections 6 are slidably connected to the two ends of the fixed section 5. An adjustment electromagnet 7 is provided inside the fixed section 5, and a support spring 8 is connected to both ends of the adjustment electromagnet 7. A magnetic block is provided at one end of the adjusting section 6 connected to the fixed section 5. When the adjusting electromagnet 7 is energized, the magnetic block is pushed outward along the length of the fixed section 5 by magnetic force, so that the adjusting section 6 is inserted into the inner wall of the borehole.

[0034] The fixed section 5 (5) serves as the base and electromagnetic drive chamber. The adjusting section 6 is the actuator, and its front end can be designed as a cone or a spearhead with barbs to penetrate the hole wall. When the adjusting electromagnet 7 is energized, it generates a magnetic field that repels or attracts the permanent magnet block (such as NdFeB N35-N52 grade) at the end of the adjusting section 6, overcoming the preload of the support spring 8 and pushing the adjusting section 6 to move outward in a straight line. After de-energization, it resets under the elastic force of the support spring 8. This design achieves non-contact, electrically controlled rapid extension and mechanical spring reset.

[0035] The adjusting electromagnet 7 can be a DC push-pull type electromagnet, with a working voltage of 12V / 24VDC. The thrust is calculated and selected based on the required anchoring force (e.g., 50N-200N). The supporting spring 8 is a stainless steel compression spring, and its stiffness needs to be precisely designed according to the electromagnet thrust and the required return stroke.

[0036] like Figure 6 and Figure 8 As shown, a sleeve is disposed in the middle of the support rod 3, and the sleeve is rotatably disposed in the middle of the telescopic adjustment rod. Both ends of the support rod 3 are connected to connecting sliders 9, and the connecting sliders 9 are slidably connected to the guide rail 2.

[0037] The sleeve connects the support rod 3 and the telescopic adjusting rod at the center point, serving as the pivot for the cross-shaped motion. The connecting slider 9 couples the end of the support rod 3 to the guide rail 2, converting the combined rotational and translational motion of the support rod 3 into pure sliding along the guide rail 2. This is the key interface for force transmission and motion guidance.

[0038] The sleeve can be made of copper-based graphite self-lubricating bushing to reduce rotational friction. The connecting slider 9 can be made of high-strength engineering plastic (such as POM) or copper alloy to be wear-resistant and reduce the coefficient of friction with the guide rail 2.

[0039] like Figure 4 and Figure 7 As shown, it also includes an operating rod 10. Each section of the support pipe 1 is equipped with two operating rods 10. The upper end of the operating rod 10 is provided with a connecting screw hole, and the lower end of the operating rod 10 is a connecting screw end. The connecting screw end is connected to the connecting screw hole of the adjacent operating rod 10 on the lower side. Both the upper and lower parts of the support rod 3 are equipped with connecting rings 11. The outer periphery of the operating rod 10 is provided with a threaded section. The connecting ring 11 is sleeved on the outside of the threaded section. The threaded section is equipped with at least two positioning nuts 12. The two positioning nuts 12 are respectively located on the upper side and the lower side of the connecting ring 11 to lock and position the connecting ring 11 and the operating rod 10.

[0040] The operating lever 10 serves as the central control and connecting shaft, running through multiple sections of the support pipe 1. Its design, featuring a connecting screw hole and a connecting screw end, enables quick threaded connection and facilitates lengthening according to drilling depth. The threaded section, connecting ring 11, and positioning nut 12 constitute a precise angle and height adjustment and locking mechanism. By pushing or pulling the operating lever 10, the support rod 3 can be moved, thereby changing its angle. After adjustment, the connecting ring 11 is tightly locked onto the threaded section using the upper and lower positioning nuts 12, thus completely fixing the position and orientation of the entire auxiliary support assembly and preventing support failure due to vibration or stress relaxation.

[0041] like Figure 8 As shown, the connecting slider 9 is rotatably connected to the support rod 3.

[0042] The support rod 3 is allowed to rotate with the operating rod 10 to change its angle, while its end can freely adapt to the angle change with the guide rail 2, avoiding motion interference and ensuring the smoothness of the mechanism's movement.

[0043] like Figure 1 As shown, the anti-slip texture 4 is a vertically distributed, densely packed anti-slip horizontal texture.

[0044] A method of using an anti-collapse hole device includes the following steps: Before lowering the pipe, select a support pipe 1 of appropriate size according to the borehole diameter and depth, and assemble an appropriate number of auxiliary support components. Check the appearance, elasticity and anti-slip texture 4 of the support pipe 1 to see if they are intact. Check if the joints of the auxiliary support components rotate flexibly and if the telescopic adjustment rod rotates normally.

[0045] A1. Pipe lowering process: The support rod 3 is moved along the guide rail 2 by the operating rod 10, so that the vertical projection length of the support rod 3 is less than the retracted length of the telescopic adjustment rod. The support rod 3 serves as the short diameter of the support pipe 1 and the telescopic adjustment rod serves as the long diameter of the support pipe 1. The support pipe 1 is lowered into the borehole and the operating rods 10 of the adjacent support pipe 1 are connected. Multiple support pipes 1 are sequentially lowered into the borehole, and the operating rods 10 of adjacent support pipes 1 are threaded together. The support rods 3 inside the support pipes 1 are connected to the operating rods 10.

[0046] By adjusting the height of the operating lever 10 through the ground control mechanism, the support rod 3 is turned into an inclined state, and the support pipe 1 can take on a flat oval shape.

[0047] A2. Support process: Adjust the angle of the support rod 3 by operating rod 10 so that the support rod 3 is horizontally spread out and the anti-slip texture 4 is tightly pressed against the inner wall of the borehole. When the electromagnet is energized, the telescopic adjustment rod is spread outward and the outer end of the telescopic adjustment rod is pressed against the borehole.

[0048] Adjusting the angle of the support rod 3 by operating lever 10 allows the support rod 3 to be radially extended to a horizontal state, with the protective groove fitting tightly against the inner wall of the borehole. Simultaneously, energizing the electromagnet 7 generates magnetic force, pushing the magnetic blocks at both ends to overcome the resistance of the support spring 8, causing the outer end of the adjusting section 6 to pop outward and directly penetrate or wed into the rock strata of the borehole wall, forming a mechanical anchoring point.

[0049] After installation, the gaps between the upper and lower ends of the borehole and the support pipe 1 can be sealed to prevent gas leakage.

[0050] During the pipe lowering process in step A1, the top view of the support pipe 1 is flat and round, and at this time the long diameter of the support pipe 1 is smaller than the inner diameter of the borehole. During the support process in step A2, the support rod 3 serves as the long diameter of the support pipe 1, and the long diameter is equal to the inner diameter of the borehole.

[0051] After use, by moving the operating lever 10, the support rod 3 is rotated to the tilted state. At the same time, the electromagnet 7 is energized to magnetically attract the adjustment section, unlocking the support pipe 1 from the inner wall of the borehole. Then, by pulling the operating lever 10 upward, the support pipe 1 can be directly removed outward, making disassembly and assembly convenient.

[0052] The above-described specific embodiments are merely specific examples of the present invention. The patent protection scope of the present invention includes, but is not limited to, the product form and style of the above-described specific embodiments. Any anti-collapse hole device and method of use that conforms to the claims of the present invention, and any appropriate changes or modifications made thereto by those skilled in the art, shall fall within the patent protection scope of the present invention.

Claims

1. A device for preventing hole collapse, characterized in that: The system includes a support pipe (1) and an auxiliary support assembly. The support pipe (1) is an elastic rigid pipe. The inner wall of the support pipe (1) is provided with two vertically parallel guide rails (2). The auxiliary support assembly includes a support rod (3) and a telescopic adjustment rod that are rotatably connected in a cross shape. The outer end of the telescopic adjustment rod passes through the support pipe (1). The two ends of the support rod (3) are slidably connected to the two guide rails (2) respectively. The outer wall of the support pipe (1) is provided with anti-slip textures (4). The anti-slip textures (4) are correspondingly provided on the outer side of the guide rails (2). During installation, the support pipe (1) is lowered into the borehole in a flat, round shape. The support rod (3) serves as the short diameter of the support pipe (1), and the telescopic adjustment rod serves as the long diameter of the support pipe (1). At this time, the length of the telescopic adjustment rod is less than the inner diameter of the borehole. In the support state, the support rod (3) moves along the guide rail (2) and is converted to the long diameter of the support pipe (1). The anti-slip texture (4) is pressed against the inner wall of the borehole, the telescopic adjustment rod extends, and the outer end of the telescopic adjustment rod is inserted into the inner wall of the borehole.

2. The anti-collapse hole device according to claim 1, characterized in that: The support pipe (1) is provided with at least two sets of auxiliary support components inside, and the support pipe (1) is an elastic metal pipe or a rigid silicone pipe.

3. The anti-collapse hole device according to claim 1, characterized in that: The telescopic adjustment rod includes a fixed section (5) and two adjustment sections (6). The fixed section (5) is rotatably connected to the support rod (3). The two adjustment sections (6) are slidably connected to the two ends of the fixed section (5). An adjustment electromagnet (7) is provided inside the fixed section (5). Support springs (8) are connected to the two ends of the adjustment electromagnet (7). A magnetic block is provided at one end of the adjustment section (6) connected to the fixed section (5). When the adjustment electromagnet (7) is energized, the magnetic block is pushed outward along the length of the fixed section (5) by magnetic force, so that the adjustment section (6) is inserted into the inner wall of the borehole.

4. The anti-collapse hole device according to claim 1, characterized in that: A sleeve is provided in the middle of the support rod (3), and the sleeve is rotatably set in the middle of the telescopic adjustment rod. Both ends of the support rod (3) are connected to connecting sliders (9), and the connecting sliders (9) are slidably connected to the guide rail (2).

5. The anti-collapse hole device according to claim 1, characterized in that: It also includes an operating rod (10). Each section of the support pipe (1) is equipped with two operating rods (10). The upper end of the operating rod (10) is provided with a connecting screw hole, and the lower end of the operating rod (10) is a connecting screw end. The connecting screw end is connected to the connecting screw hole of the adjacent operating rod (10) on the lower side. The upper part and the lower part of the support rod (3) are both equipped with connecting rings (11). The outer periphery of the operating rod (10) is provided with a threaded section. The connecting ring (11) is sleeved on the outside of the threaded section. The threaded section is equipped with at least two positioning nuts (12). The two positioning nuts (12) are respectively set on the upper side and the lower side of the connecting ring (11) to lock and position the connecting ring (11) and the operating rod (10).

6. The anti-collapse hole device according to claim 4, characterized in that: The connecting slider (9) is rotatably connected to the support rod (3).

7. The anti-collapse hole device according to claim 1, characterized in that: The anti-slip texture (4) is a vertically distributed, densely packed anti-slip horizontal texture.

8. A method of using an anti-collapse hole device, comprising the anti-collapse hole device according to any one of claims 1-7, characterized in that: Includes the following steps: A1. Pipe lowering process: The support rod (3) is pushed along the guide rail (2) by the operating rod (10) so that the vertical projection length of the support rod (3) is less than the retracted length of the telescopic adjustment rod. The support rod (3) serves as the short diameter of the support pipe (1) and the telescopic adjustment rod serves as the long diameter of the support pipe (1). The support pipe (1) is lowered into the borehole and the operating rods (10) of the adjacent support pipes (1) are connected. A2. Support process: Adjust the angle of the support rod (3) by operating rod (10) so that the support rod (3) is horizontally spread out and the anti-slip texture (4) is pressed against the inner wall of the borehole. When the electromagnet is energized, the telescopic adjustment rod is spread outward and the outer end of the telescopic adjustment rod is pressed against the borehole.

9. The method of using the anti-collapse hole device according to claim 8, characterized in that: During the pipe lowering process in step A1, the top view of the support pipe (1) is flat and round. At this time, the long diameter of the support pipe (1) is smaller than the inner diameter of the borehole. During the support process in step A2, the support rod (3) serves as the long diameter of the support pipe (1), and the long diameter is equal to the inner diameter of the borehole.

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