A hole sealing device for preventing borehole collapse

Abstract

The utility model relates to karst development area hole sealing technical field discloses a kind of hole sealing devices for preventing borehole collapse, comprising: wood plug, first sleeve and clamping assembly, first sleeve is used to be located in borehole, first sleeve is equipped with inner cavity passing through its upper and lower end face, limit slot is opened on the inner peripheral wall of first sleeve, the position of first sleeve corresponding limit slot is equipped with the connecting hole extending along radial direction and passing through the inner wall and outer wall surface of first sleeve;Wood plug is located in inner cavity;Clamping assembly includes: clamping plate, threaded adjusting part, clamping plate is slidably arranged in limit slot, limit slot is used to limit the axial movement of clamping plate along it, so that it can be radially slid relative to first sleeve, clamping plate has abutting surface, threaded adjusting part is screwed with first sleeve through connecting hole, and the end of threaded adjusting part abuts clamping plate, so that the abutting surface of clamping plate is attached to the outer peripheral wall of wood plug;The present application can guarantee that wood plug and the inner wall of first sleeve are closely attached.

Description

Technical Field

[0001] This utility model relates to the field of borehole sealing technology in karst development areas, specifically to a borehole sealing device for preventing borehole collapse. Background Technology

[0002] When drilling in karst areas, the widespread distribution of caves, fissures and loose sand layers can easily lead to borehole collapse and grout leakage, affecting the stability of the borehole and the effect of grouting reinforcement, and threatening construction safety and project quality.

[0003] To address the aforementioned issues, existing technologies typically employ a sealing process of "sealing the gap between the sleeve and the rock surface + upward grouting" to achieve ground reinforcement and prevent ground subsidence. The specific operational procedure is as follows: First, drilling equipment is used to reach the rock surface, specifically the top of a cavern, fissure, or loose sand layer to stabilize the rock interface. Then, a metal sleeve is lowered into the borehole, ensuring its lower end reaches the rock surface to maintain initial borehole stability. Next, a pre-processed cylindrical hardwood plug is inserted into the metal sleeve, positioned precisely at the rock surface, to seal the space between the sleeve and the rock surface. Finally, a grouting pipe is lowered along the outer wall of the metal sleeve, with its end near the rock surface. Grout is then injected under pressure using grouting equipment. The grout diffuses upwards along the gap between the metal sleeve and the ground, filling the space and reinforcing the surrounding strata.

[0004] However, this process has significant technical bottlenecks, the core issue being the poor fit between the wooden plug and the inner wall of the metal sleeve. On one hand, the wooden plug material has textures, pores, and low processing precision, making it difficult to achieve a tight fit with the inner wall of the metal sleeve. On the other hand, construction vibrations and changes in ground stress can cause the wooden plug to shift, disrupting the seal. This leads to grout leakage from the gap between the wooden plug and the metal sleeve during grouting, resulting in grout loss and insufficient filling of cavities and fissures in the formation, reducing the grouting reinforcement effect and easily causing borehole collapse. Therefore, there is an urgent need to design a new sealing device that can improve the fit between the wooden plug and the inner wall of the metal sleeve. Utility Model Content

[0005] The purpose of this invention is to provide a sealing device for preventing borehole collapse, so as to ensure that the wooden plug fits tightly against the inner wall of the metal sleeve.

[0006] To achieve the above objectives, this application provides a sealing device for preventing borehole collapse, comprising: a wooden plug, a first sleeve, and a clamping assembly.

[0007] The first sleeve is used to be installed in the borehole. The first sleeve has an inner cavity that penetrates its upper and lower end faces. A limiting groove is provided on the inner peripheral wall of the first sleeve. The first sleeve has a connecting hole that extends radially and penetrates the inner and outer walls of the first sleeve at the position corresponding to the limiting groove.

[0008] The wooden plug is disposed in the inner cavity;

[0009] The clamping assembly includes a clamping plate and a threaded adjusting member. The clamping plate is slidably disposed in the limiting groove, which restricts the clamping plate from moving axially so that it can slide radially relative to the first sleeve. The side of the clamping plate opposite to the wooden plug has an abutment surface that matches the shape of the outer peripheral wall of the wooden plug. The threaded adjusting member is screwed to the first sleeve through the connecting hole, and the end of the threaded adjusting member abuts against the clamping plate so that the abutment surface of the clamping plate fits against the outer peripheral wall of the wooden plug.

[0010] As a preferred technical solution, the clamping plate has a grouting hole that penetrates its inner and outer peripheral walls at a position opposite to the connecting hole, and the threaded adjusting member has a grouting channel that connects its two ends and communicates with the grouting hole.

[0011] As a preferred technical solution, the threaded adjustment component includes: a main body and a rod body. The main body is screwed to the first sleeve through the connecting hole. The rod body is disposed inside the main body, and the end of the rod body abuts against the clamping plate. The rod body has a grouting channel that connects its two ends and communicates with the grouting hole.

[0012] As a preferred technical solution, the end of the rod that abuts against the clamping plate is tapered.

[0013] As a preferred technical solution, the clamping assembly is provided in multiple sets, the multiple sets of clamping assemblies are arranged circumferentially and spaced apart on the first sleeve, and the first sleeve is provided with multiple limiting grooves and multiple connecting holes corresponding one-to-one with the multiple sets of clamping assemblies.

[0014] As a preferred technical solution, the clamping plate has a positioning spike on one side of the abutment surface.

[0015] As a preferred technical solution, the sealing device for preventing borehole collapse further includes: a second sleeve and a connector. The second sleeve is disposed inside the borehole and is screwed to the ground. The first sleeve is sleeved inside the second sleeve and has a protrusion protruding from the top of the second sleeve. The connecting hole and the limiting groove are respectively disposed on the protrusion. The second sleeve has a fixing hole penetrating its inner and outer peripheral walls. The connector is screwed to the second sleeve through the fixing hole, and the end of the connector abuts against the outer peripheral wall of the first sleeve.

[0016] As a preferred technical solution, the second sleeve includes: a cylinder body and a boss. The cylinder body is disposed in the drilled hole, and the boss is fixedly connected to the top of the cylinder body in the circumferential direction. The boss has a fixing hole that passes through both ends of it. The bottom surface of the boss and the outer peripheral wall of the cylinder body together define a snap-fit ​​part, and the boss is screwed to the ground.

[0017] As a preferred technical solution, the second sleeve further includes: a fixing part, which is fixedly disposed on the boss, and the fixing part has fixing holes extending through both ends thereon.

[0018] As a preferred technical solution, an abutment groove is provided on the outer peripheral wall of the protrusion, the abutment groove is correspondingly provided with the fixing hole, and the connector passes through the fixing hole and abuts against the abutment groove.

[0019] The sealing device for preventing borehole collapse provided by the above technical solution has the following advantages compared with the prior art: by tightening the threaded adjustment component, the contact surface of the clamping plate is always in close contact with the outer peripheral wall of the wooden plug, ensuring that the wooden plug remains fixed during the grouting process, preventing gaps from appearing between the wooden plug and the first sleeve due to the movement of the wooden plug, and preventing grout from flowing out of the gaps, which would affect the grouting reinforcement effect. Attached Figure Description

[0020] The present application will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are intended only to conceptually represent the composition or structure of the described objects and may contain exaggerated representations, and the drawings are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the hole sealing device for preventing borehole collapse according to this utility model;

[0022] Figure 2 This is a cross-sectional view of the sealing device for preventing borehole collapse according to this utility model;

[0023] Figure 3 This is a top view of the sealing device for preventing borehole collapse according to this utility model;

[0024] Figure 4 This is a cross-sectional view of section AA of this utility model;

[0025] Figure 5 This is a cross-sectional view of the BB section of this utility model;

[0026] Figure 6 This is a partial schematic diagram of point A in this utility model;

[0027] Wherein: 1. First sleeve; 11. Inner cavity; 12. Limiting groove; 13. Protrusion; 131. Abutment groove; 2. Clamping assembly; 21. Clamping plate; 211. Abutment surface; 212. Grouting hole; 22. Threaded adjustment component; 221. Grouting channel; 222. Main body; 223. Rod body; 3. Second sleeve; 31. Fixing part; 311. Fixing hole; 32. Cylinder body; 33. Boss; 34. Snap-fit ​​part. Detailed Implementation

[0028] Preferred embodiments of this application will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary, and should not be construed as limiting the scope of protection of this application.

[0029] First, it should be noted that the directions such as top, bottom, upward, and downward mentioned in this article are defined relative to the directions in the various accompanying figures. They are relative concepts and therefore can change depending on their different positions and practical applications. Therefore, these or other directions should not be interpreted as restrictive terms.

[0030] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude the plural.

[0031] Furthermore, it should be noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the accompanying drawings, can still be combined among these technical features (or their equivalents) to obtain other embodiments of this application not directly mentioned herein.

[0032] It should also be understood that while the terms "first," "second," etc., are used in this document to describe various types of information, this information should not be limited to these terms, which are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0033] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0034] Please see Figure 1-3 A sealing device for preventing borehole collapse, provided in an embodiment of this application, includes: a wooden plug, a first sleeve 1, and a clamping assembly 2.

[0035] The first sleeve 1 is disposed inside the drilled hole. The first sleeve 1 has an inner cavity 11 extending through its upper and lower end faces. A limiting groove 12 is formed along the inner circumferential wall of the first sleeve 1. The first sleeve 1 has a connecting hole that extends radially and penetrates the inner and outer walls of the first sleeve 1 at the position corresponding to the limiting groove 12. The wooden plug is disposed in the inner cavity 11. The clamping assembly 2 includes: a clamping plate 21 and a threaded adjustment component 22. The clamping plate 21 is slidably disposed in the limiting groove 12. The limiting groove 12 is used to restrict the clamping plate 21 from moving along its axial direction so that it can slide radially relative to the first sleeve 1. The side of the clamping plate 21 opposite to the wooden plug has an abutment surface 211 that is adapted to the shape of the outer peripheral wall of the wooden plug. The threaded adjustment member 22 is screwed to the first sleeve 1 through the connecting hole, and the end of the threaded adjustment member 22 abuts against the clamping plate 21 so that the abutment surface 211 of the clamping plate 21 fits against the outer peripheral wall of the wooden plug.

[0036] In this embodiment, a drilling device is used to drill to the rock surface. The first sleeve 1 is placed into the borehole so that its bottom end reaches the rock surface and its top end is exposed to maintain the initial stability of the borehole. The clamping plate 21 is placed in the limiting groove 12 on the inner peripheral wall of the first sleeve 1, and the threaded adjustment member 22 is screwed to the first sleeve 1 through the connecting hole, with the end of the threaded adjustment member 22 abutting against the clamping plate 21. Then, a wooden plug is inserted into the inner cavity 11 of the first sleeve 1, with its lower end just in contact with the rock surface. The threaded adjustment member 22 is gradually tightened so that the clamping plate 21 slides radially relative to the first sleeve 1 within the limiting groove 12 until the abutting surface 211 of the clamping plate 21 is tightly fitted against the outer peripheral wall of the wooden plug. At this point, the wooden plug can seal the inner cavity of the first sleeve 1. Finally, the grouting pipe is lowered into the borehole along the outer perimeter of the first sleeve 1, with its end positioned near the rock surface. Grout is then injected under pressure using grouting equipment. The grout spreads upwards along the annular gap between the first sleeve 1 and the formation, thus reinforcing the strata surrounding the borehole. This device ensures the wooden plug remains fixed during grouting, preventing movement due to factors such as processing precision, construction vibration, and changes in formation stress. Movement of the wooden plug due to these factors would create a gap between the wooden plug and the first sleeve 1, causing grout to leak into the first sleeve 1, resulting in grout loss and insufficient filling of cavities and fissures in the formation, thus reducing the effectiveness of the grouting reinforcement.

[0037] Because the cork is relatively soft, if it is fixed by only a single set of clamping plates 21, it is easy for the cork to be squeezed and deformed due to excessive local pressure, thus shortening its service life. Therefore, in some embodiments, the clamping assembly 2 is provided in multiple sets, which are circumferentially arranged and spaced apart on the first sleeve 1. The first sleeve has multiple limiting grooves and multiple connecting holes corresponding to the multiple sets of clamping assemblies. The multiple sets of clamping plates 21 are slidably disposed in a limiting groove 12, and multiple threaded adjusting members 22 are screwed to the first sleeve 1 through a connecting hole, with the ends of the multiple threaded adjusting members 22 abutting against a set of clamping plates 21. The multiple sets of clamping plates 21 apply clamping force to the cork from different angles, which can effectively limit the axial movement, radial displacement or rotation of the cork in the first sleeve 1. Compared with the single point or single line force of a single set of clamping plates 21, multi-point clamping can disperse the influence of external force on the cork and reduce the risk of loosening due to excessive local force.

[0038] In some embodiments, the clamping plate 21 has a positioning spike (not shown in the figures) on one side of the abutment surface 211. When the abutment surface 211 of the clamping plate 21 contacts the stopper, the positioning spike can embed into the surface of the stopper, effectively preventing the stopper from shifting, sliding, or falling off during clamping by replacing simple planar friction with mechanical interlocking. Furthermore, the positioning spike can form multiple points of support on the outer peripheral wall of the stopper to enhance the fit between the clamping plate 21 and the stopper, avoiding excessive local stress that could cause deformation or damage to the stopper.

[0039] Please see Figure 1 In some embodiments, the sealing device further includes: a second sleeve 3 and a connector. The second sleeve 3 is disposed inside the drilled hole and is screwed to the ground. The first sleeve 1 is sleeved inside the second sleeve 3. The first sleeve 1 has a protrusion 13 protruding from the top of the second sleeve 3. The connecting hole and the limiting groove 12 are respectively disposed on the protrusion 13. The second sleeve 3 has a fixing hole 311 penetrating its inner and outer peripheral walls. The connector is screwed to the second sleeve 3 through the fixing hole 311, and the end of the connector abuts against the outer peripheral wall of the first sleeve 1.

[0040] In this embodiment, a second sleeve 3 is provided to position the first sleeve 1 and prevent it from moving during grouting, which could create a gap between the wooden plug and the first sleeve 1 and cause sealing failure. When installing the sealing device, the second sleeve 3 is first placed into the drilled hole, and its top is screwed to the ground to ensure stability. Then, the first sleeve 1 is fitted inside the second sleeve 3, with a portion protruding from it. The connecting piece is then screwed to the first sleeve 1 through the fixing hole 311 on the second sleeve 3, with the end of the connecting piece abutting against the outer peripheral wall of the first sleeve 1. This ensures the stability of the first sleeve 1 during construction.

[0041] Please see Figure 4-5 In some embodiments, the second sleeve 3 includes: a cylindrical body 32 and a boss 33. The cylindrical body 32 is disposed in the drilled hole, and the boss 33 is fixedly connected to the top end of the cylindrical body 32 in the circumferential direction. The boss 33 has a fixing hole 311 that passes through both ends of it. The bottom surface of the boss 33 and the outer peripheral wall of the cylindrical body 32 together define a snap-fit ​​portion 34. The boss 33 is screwed to the ground.

[0042] In this embodiment, the bottom surface of the boss 33 and the outer peripheral wall of the cylinder 32 together define a locking part 34. When the cylinder 32 is inserted into the borehole, the locking part 34 can mechanically engage with the edge of the borehole. This locking structure can limit the axial movement and radial sway of the cylinder 32 in the borehole, effectively improving the stability of the cylinder 32. Furthermore, the design of the boss 33 forms a dual fixing mode of locking + screw connection. The locking part 34 restricts the basic displacement of the cylinder 32 through mechanical cooperation, and the screw connection further rigidly connects the boss 33 and the cylinder to the ground through fasteners. This dual fixing can cope with complex working conditions. Even if a single fixing method becomes slightly loose, the locking part 34 can still provide auxiliary fixing, reduce the risk of overall failure, and further ensure the stability of the second sleeve 3.

[0043] In some embodiments, the second sleeve 3 further includes a fixing part 31, which is fixedly disposed on the boss 33, and the fixing part 31 has fixing holes 311 extending through both ends therefrom. When the connector abuts against the first sleeve 1, it will generate radial locking force and reaction force on the connecting hole 311. If a hole is directly drilled on the boss 33, the boss 33 will have to bear this force alone, which is prone to cracking and deformation of the boss 33 due to local stress concentration. The fixing part 31 can act as an independent force-bearing carrier, specifically bearing the locking force of the connector, avoiding the force from acting directly on the boss 33, and protecting the structural integrity of the boss 33.

[0044] Please see Figure 1In some embodiments, an abutment groove 131 is formed on the outer peripheral wall of the protrusion 13. The abutment groove 131 is correspondingly provided with the fixing hole 311, and the connector passes through the fixing hole 311 and abuts against the abutment groove 131. The abutment groove 131 is equivalent to setting a positioning point on the outer periphery of the protrusion 13. When the connector abuts against the abutment groove 131, the protrusion 13 can be fixed to accommodate drill holes of different diameters. Moreover, compared with a smooth outer peripheral wall without grooves, the abutment groove 131 can clearly define the fixed position of the protrusion 13 through the mechanical engagement between the groove and the connector, avoiding positional displacement caused by vibration, external force, etc., and ensuring positioning accuracy.

[0045] In the initial stage of construction, as long as the loose layer above the rock surface is reinforced, the structural strength of the rock surface itself can temporarily support the load above. Even if there are karst caves below, they will not directly cause ground collapse in the short term. Therefore, the first sleeve 1 is inserted into the borehole, and a wooden plug is inserted into the first sleeve 1 and positioned at the rock surface to fix the plug, maintaining the initial stability of the borehole before grouting can proceed. However, this stability is "conditional": if the karst cave below continues to expand (e.g., due to long-term erosion by groundwater), it may gradually weaken the bearing capacity of the rock surface, eventually causing the borehole to collapse, requiring further grouting reinforcement. This application specifically makes the following design for the later grouting reinforcement work:

[0046] Please see Figure 5-6 In some embodiments, the clamping plate 21 has a grouting hole 212 penetrating its inner and outer peripheral walls at a position opposite to the connecting hole, and the threaded adjusting member 22 has a grouting channel 221 connecting its two ends and communicating with the grouting hole. During secondary grouting reinforcement, the cone is passed through the grouting channel 221 and the grouting hole 212 in sequence, so that it contacts the wooden plug and crushes the wooden plug. Then, the grouting pipe is extended into the grouting channel 221, and the grout flows into the inner cavity 11 along the grouting channel 221 and the grouting hole 212. Then, the grouting equipment is started to grout the crushed wooden plug and the inner cavity 11. The combination of debris and grout quickly rebuilds the sealing and reinforcement structure, so as to re-seal the inner cavity 11 of the first sleeve 1. Using this device, there is no need to pull out the first sleeve 1 again, which can avoid secondary disturbance to the unstable strata and effectively improve construction efficiency.

[0047] In some embodiments, the threaded adjustment component 22 includes a main body 222 and a rod 223. The main body 222 is screwed to the first sleeve 1 through the connecting hole. The rod 223 is disposed inside the main body 222, and the end of the rod 223 abuts against the clamping plate 21. The rod 223 has a grouting channel 221 that connects its two ends and communicates with the grouting hole 212. In actual use, rotating the main body 222 can gradually tighten it, causing the rod 223 to push the clamping plate 21 to slide radially relative to the first sleeve 1 within the limiting groove 12. With this configuration, the main body 222, as the "actuating end" of the adjustment operation, has a larger outer diameter than the rod 223, making it easier to rotate manually and reducing the difficulty of adjustment. The rod 223, as the "transmission end," is designed with a slender structure, which reduces the force-bearing area when in contact with the clamping plate 21, improves the concentration of thrust, and ensures that the clamping plate 21 slides more smoothly along the limiting groove 12, avoiding deviation. In addition, the grouting channel 221 needs to pass through the threaded adjusting component 22 and connect with the grouting hole 212 of the clamping plate 21. When the rod body 223 is designed independently, it can be axially drilled separately. Compared with machining the channel on the integral main body 222, it is easier to ensure the straightness and diameter accuracy of the channel and reduce the machining difficulty. Moreover, the end of the rod body 223 directly abuts against the clamping plate 21, which facilitates the alignment of the grouting channel 221 with the grouting hole 212, reduces the risk of leakage during grouting, and improves grouting efficiency.

[0048] In some embodiments, the end of the rod 223 that abuts against the clamping plate 21 is tapered. The tapered structure has a small tip area, so when the rod 223 pushes the clamping plate 21, the same axial thrust generates greater pressure at the contact point, making it easier for the clamping plate 21 to overcome static friction and begin to slide. Furthermore, when the end of the rod 223 is tapered, the outlet of the grouting channel 221 is at the tip of the cone, allowing the grout to flow more concentratedly towards the grouting hole 212 of the clamping plate 21. The tapered outlet reduces grout diffusion loss between contact surfaces, increases grouting pressure and flow rate, and ensures smoother injection of grout into the target area.

[0049] In summary, the borehole sealing device provided in this embodiment for preventing borehole collapse screws the second sleeve 3 to the ground to ensure that the second sleeve 3 will not move during grouting. The connection structure ensures that the first sleeve 1 remains stationary relative to the second sleeve 3. The clamping assembly 2 ensures that the wooden plug remains stationary relative to the first sleeve 1, so that there will be no gap between the wooden plug and the first sleeve 1, preventing grout from leaking out of the gap and causing grout leakage, which would affect construction efficiency.

[0050] This specification discloses the present application with reference to the accompanying drawings and also enables those skilled in the art to implement the application, including making and using any device or system, employing suitable materials, and using any combination of methods. The scope of this application is defined by the claimed technical solution and includes other instances that would occur to those skilled in the art. Such other instances shall be considered to fall within the scope of protection defined by the claimed technical solution, provided that they include structural elements that are not different from the literal language of the claimed technical solution, or contain equivalent structural elements that are not substantially different from the literal language of the claimed technical solution.

Claims

1. A hole sealing device for preventing collapse of a borehole, characterised in that, include: Cork, first sleeve, and clamping assembly The first sleeve is used to be installed in the borehole. The first sleeve has an inner cavity that penetrates its upper and lower end faces. A limiting groove is provided on the inner peripheral wall of the first sleeve. The first sleeve has a connecting hole that extends radially and penetrates the inner and outer walls of the first sleeve at the position corresponding to the limiting groove. The wooden plug is disposed in the inner cavity; The clamping assembly includes a clamping plate and a threaded adjusting member. The clamping plate is slidably disposed in the limiting groove, which restricts the clamping plate from moving axially so that it can slide radially relative to the first sleeve. The side of the clamping plate opposite to the wooden plug has an abutment surface that matches the shape of the outer peripheral wall of the wooden plug. The threaded adjusting member is screwed to the first sleeve through the connecting hole, and the end of the threaded adjusting member abuts against the clamping plate so that the abutment surface of the clamping plate fits against the outer peripheral wall of the wooden plug.

2. The hole closure device for preventing borehole collapse of claim 1, wherein, The clamping plate has a grouting hole that penetrates its inner and outer peripheral walls at a position opposite to the connecting hole, and the threaded adjusting member has a grouting channel that connects its two ends and communicates with the grouting hole.

3. The hole closure device for preventing borehole collapse of claim 2, wherein, The threaded adjustment component includes: a main body and a rod. The main body is screwed to the first sleeve through the connecting hole. The rod is disposed inside the main body, and the end of the rod abuts against the clamping plate. The rod has a grouting channel that connects its two ends and communicates with the grouting hole.

4. The hole closure device for preventing borehole collapse of claim 3, wherein, The end of the rod that abuts against the clamping plate is tapered.

5. The hole closure device for preventing borehole collapse of claim 1, wherein, The clamping assembly is provided in multiple sets, which are arranged circumferentially and spaced apart on the first sleeve. The first sleeve is provided with multiple limiting grooves and multiple connecting holes that correspond one-to-one with the multiple sets of clamping assemblies.

6. The hole closure device for preventing borehole collapse of claim 1, wherein, The clamping plate has a positioning spike on one side of the abutment surface.

7. The hole closure device for preventing borehole collapse of claim 1, wherein, Also includes: A second sleeve and a connector are provided. The second sleeve is installed inside the drilled hole and is screwed to the ground. The first sleeve is fitted inside the second sleeve and has a protrusion protruding from the top of the second sleeve. The connecting hole and the limiting groove are respectively provided on the protrusion. The second sleeve has a fixing hole that penetrates its inner and outer peripheral walls. The connector is screwed to the second sleeve through the fixing hole, and the end of the connector abuts against the outer peripheral wall of the first sleeve.

8. The hole closure device for preventing borehole collapse of claim 7, wherein, The second sleeve includes: a cylindrical body and a boss. The cylindrical body is disposed in the drilled hole. The boss is fixedly connected to the top of the cylindrical body in the circumferential direction. The boss has a fixing hole that passes through both ends. The bottom surface of the boss and the outer peripheral wall of the cylindrical body together define a snap-fit ​​part. The boss is screwed to the ground.

9. The hole closure device for preventing borehole collapse of claim 8, wherein, The second sleeve further includes a fixing part, which is fixedly disposed on the boss, and the fixing part has fixing holes extending through both ends thereon.

10. The sealing device for preventing borehole collapse as described in claim 9, characterized in that, An abutment groove is provided on the outer peripheral wall of the protrusion, and the abutment groove is provided corresponding to the fixing hole. The connector passes through the fixing hole and abuts against the abutment groove.

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