A supporting and reinforcing device for preventing the collapse of a borehole wall in geotechnical investigation drilling

Abstract

This utility model discloses a support and reinforcement device for preventing borehole wall collapse during geotechnical exploration drilling, relating to the technical field of geotechnical engineering exploration equipment. It solves the problem of borehole collapse during core drilling in existing technologies. The device includes a core tube and a sheath. The core tube is rotatably fitted inside the sheath. A first thrust bearing is fitted at the top of the core tube, and a limiting component restricting its axial upward movement is provided at the top of the first thrust bearing. A second thrust bearing is fitted at the bottom of the core tube, and a support component restricting its axial downward movement is provided at the bottom of the second thrust bearing. The sheath is sandwiched between the first and second thrust bearings. This support and reinforcement device for preventing borehole wall collapse during geotechnical exploration drilling is used for sampling in geotechnical exploration boreholes. The core tube is rotatably fitted inside the sheath. During borehole reaming, the outer wall of the sheath is tightly attached to the inner wall of the borehole, providing radial support and preventing borehole collapse.

Description

Technical Field

[0001] This utility model belongs to the technical field of geotechnical engineering exploration equipment, specifically, it relates to a support and reinforcement device for preventing borehole wall collapse during geotechnical exploration drilling. Background Technology

[0002] Geotechnical exploration drilling is an engineering technique that involves drilling holes into the ground using mechanical or manual methods to obtain soil and rock samples, conduct in-situ testing, or install monitoring equipment. Its core purpose is to reveal the distribution, physical and mechanical properties, and hydrogeological conditions of underground soil (rock strata), providing geological basis for construction projects, geological disaster prevention, and other purposes. Typical applications include foundation bearing capacity assessment, groundwater level observation, and soil and rock parameter determination. It is the most direct method for obtaining underground information in geotechnical engineering exploration.

[0003] In conventional core drilling, the outer diameter of the core tube is usually close to the borehole diameter, which can be directly used for wall protection. However, in reaming drilling, the drill bit diameter is significantly larger than the core tube, resulting in exposed borehole walls and easy borehole collapse. Existing technologies use mud wall protection or temporary casing, but mud wall protection is ineffective in loose formations and pollutes the environment. Temporary casing requires repeated pulling and lifting, which is inefficient, cumbersome, and cannot adapt to dynamic drilling. Utility Model Content

[0004] The present invention provides a support and reinforcement device for preventing borehole wall collapse during geotechnical exploration drilling. During the borehole enlargement drilling process, the outer wall of the protective sleeve is closely attached to the inner wall of the borehole, providing radial support to the borehole wall and preventing borehole collapse.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model discloses a support and reinforcement device for preventing borehole wall collapse in geotechnical exploration drilling, comprising a core tube and a sheath tube. The core tube is rotatably fitted inside the sheath tube. A first thrust bearing is fitted at the top end of the core tube, and a limiting component is provided at the top end of the first thrust bearing to restrict its axial upward movement. A second thrust bearing is fitted at the bottom end of the core tube, and a support component is provided at the bottom end of the second thrust bearing to restrict its axial downward movement. The sheath tube is sandwiched between the first thrust bearing and the second thrust bearing.

[0006] Furthermore, a first deep groove ball bearing is fitted at the top end of the drilled core tube, and a second deep groove ball bearing is fitted at the bottom end of the drilled core tube. The inner rings of the first and second deep groove ball bearings are fixedly connected to the outer wall of the drilled core tube, and the outer rings of the first and second deep groove ball bearings are in close contact with the inner wall of the sheath tube.

[0007] Furthermore, the limiting component includes a screw and an arc-shaped first retaining ring and a second retaining ring. The lower end of the mating end of the first retaining ring extends with a boss, and the top of the boss has a threaded hole for threaded connection with the screw. The upper end of the mating end of the second retaining ring extends with a pressure plate that mates with the boss. The pressure plate has a through hole. The screw, the through hole, and the threaded hole mate one by one. The top of the drilled core tube has an annular contraction opening, which is located at the top of the first thrust bearing. The first retaining ring and the second retaining ring are engaged in the contraction opening. The first retaining ring and the second retaining ring are mated to form an annular retaining ring. The inner wall of the retaining ring is in close contact with the bottom wall of the contraction opening, and the bottom surface of the retaining ring is in close contact with the top surface of the first thrust bearing. The screw shank passes through the corresponding through hole of the pressure plate and is fixedly connected to the threaded hole of the corresponding boss.

[0008] Furthermore, the screw is an internal hexagon screw, and the upper end of the through hole of the pressure plate is provided with a countersunk hole that mates with the screw head of the internal hexagon screw.

[0009] Furthermore, the support assembly includes a support ring, which is fixedly sleeved on the bottom end of the drilled core tube, and the bottom surface of the second thrust bearing is in contact with the top surface of the support ring.

[0010] Furthermore, a number of reinforcing ribs are fixedly provided between the bottom of the support ring and the outer wall of the drill core tube, and the reinforcing ribs are evenly arranged along the bottom circumference of the support ring.

[0011] Furthermore, a male connector is provided at the top end of the drill core tube, and a female connector is provided at the bottom end of the drill core tube. Two drill core tubes are connected through the corresponding male connector and female connector.

[0012] Furthermore, a gap-blocking tube is fixedly provided at the bottom end of the support ring, and an annular convex ring is fixedly provided on the inner wall of the bottom end of the gap-blocking tube. The convex ring is arranged around the circumference of the gap-blocking tube, and a rubber ring is provided at the bottom end of the gap-blocking tube. The side wall of the rubber ring is provided with a groove that cooperates with the convex ring, and the convex ring is engaged in the groove of the rubber ring.

[0013] Furthermore, the top end of the sheath tube is provided with a recessed groove that mates with the first thrust bearing, and the bottom end of the first thrust bearing is engaged in the recessed groove.

[0014] The beneficial effects of this utility model are: This application discloses a support and reinforcement device for preventing borehole wall collapse in geotechnical exploration drilling. The device is used for sampling in geotechnical exploration boreholes. The core tube is rotatably fitted inside a sheath. A first thrust bearing is fitted at the top of the core tube, and a second thrust bearing is fitted at the bottom. The sheath is clamped between the first and second thrust bearings. A limiting component at the top of the first thrust bearing prevents it from moving upwards, and the first thrust bearing prevents the sheath from axially shifting upwards. A support component at the bottom of the second thrust bearing prevents it from moving downwards, and the second thrust bearing prevents the sheath from axially sliding downwards. This device positions the sheath, prevents axial displacement of the sheath during borehole enlargement drilling, and ensures free rotation of the core tube relative to the sheath. During reaming, the outer wall of the casing adheres tightly to the inner wall of the borehole and rotates freely relative to the core tube. The casing remains stationary, preventing torque transmission to the inner wall of the borehole, minimizing disturbance to the formation, and providing radial support to the borehole wall. This support has a large range and excellent effect, effectively preventing borehole collapse and avoiding environmental pollution caused by mud wall protection. The casing provides timely support to the borehole wall as it progresses, eliminating the need for repeated pulling and retrieval, simplifying operation, improving construction efficiency, and adapting to dynamic reaming and sampling during geotechnical exploration drilling. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional structural schematic diagram of a support and reinforcement device for preventing borehole wall collapse in a geotechnical exploration borehole, provided by an embodiment of this utility model. Figure 2 This is a cross-sectional structural schematic diagram of the support component provided in an embodiment of the present utility model; Figure 3 The explosion of the drill core tube, the first thrust bearing, and the limiting assembly provided in this embodiment of the utility model. Figure 1 ; Figure 4 The explosion of the drill core tube, the first thrust bearing, and the limiting assembly provided in this embodiment of the utility model. Figure 2 ; Figure 5 This is a schematic diagram of the structure of a support and reinforcement device for preventing borehole wall collapse in geotechnical exploration drilling, provided by an embodiment of this utility model. Figure 1 ; Figure 6This is a schematic diagram of the structure of a support and reinforcement device for preventing borehole wall collapse in geotechnical exploration drilling, provided by an embodiment of this utility model. Figure 2 .

[0017] Figure label: 1. Drill core tube; 2. Second deep groove ball bearing; 3. First deep groove ball bearing; 4. Sheath tube; 5. Second thrust bearing; 6. Support assembly; 601. Support ring; 602. Rib plate; 603. Seam stop tube; 604. Convex ring; 605. Rubber ring; 7. First thrust bearing; 8. Limiting assembly; 801. First retaining ring; 802. Second retaining ring; 803. Boss; 804. Pressure plate; 805. Screw; 806. Threaded hole; 807. Through hole; 9. Shrinkage opening; 10. Sinking groove; 11. Male connector; 12. Female connector. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, this embodiment provides a support and reinforcement device for preventing borehole wall collapse in geotechnical exploration drilling, including a core tube 1 and a sheath 4. The core tube 1 is rotatably fitted inside the sheath 4. A first thrust bearing 7 is fitted at the top of the core tube 1, and a limiting component 8 is provided at the top of the first thrust bearing 7 to restrict its upward movement along the axial direction of the core tube 1. A second thrust bearing 5 is fitted at the bottom of the core tube 1, and a support component 6 is provided at the bottom of the second thrust bearing 5 to restrict its downward movement along the axial direction of the core tube 1. The sheath 4 is sandwiched between the first thrust bearing 7 and the second thrust bearing 5. The core tube 1 can be directly rotatably fitted inside the sheath 4 or installed inside the sheath 4 using a deep groove ball bearing. The sheath tube 4 is sandwiched between the first thrust bearing 7 and the second thrust bearing 5. The top end of the sheath tube 4 is in contact with or abuts against the bottom end of the first thrust bearing 7, and the bottom end of the sheath tube 4 is in contact with or abuts against the top end of the second thrust bearing 5. The limiting component 8 is a set screw or a retaining ring. The supporting component 6 is a supporting plate or a supporting ring.

[0021] The above-described support and reinforcement device for preventing borehole wall collapse in geotechnical exploration boreholes is used for sampling in geotechnical exploration boreholes. The core tube 1 is rotatably sleeved inside the sheath tube 4. A first thrust bearing 7 is installed at the top of the core tube 1, and a second thrust bearing 5 is installed at the bottom of the core tube 1. The sheath tube 4 is clamped between the first thrust bearing 7 and the second thrust bearing 5. The limiting component 8 at the top of the first thrust bearing 7 prevents the first thrust bearing 7 from moving upward along the axial direction of the core tube 1, and the first thrust bearing 7 prevents the sheath tube 4 from moving upward along the axial direction of the core tube 1. The support component 6 at the bottom of the second thrust bearing 5 prevents the second thrust bearing 5 from moving downward along the axial direction of the core tube 1, and the second thrust bearing 5 prevents the sheath tube 4 from sliding downward along the axial direction of the core tube 1. The sheath tube 4 is installed and positioned to prevent axial displacement of the sheath tube 4 during borehole enlargement drilling and to ensure that the core tube 1 can rotate freely relative to the sheath tube 4. During reaming, the outer wall of the casing 4 is tightly attached to the inner wall of the borehole and rotates freely relative to the core tube 1. The casing 4 remains stationary, preventing torque transmission to the inner wall of the borehole, reducing disturbance to the formation within the borehole, and providing radial support to the inner wall of the borehole. This provides a large support range and good support effect, effectively preventing borehole collapse and avoiding environmental pollution caused by mud wall protection. The casing 4 provides timely support to the inner wall of the borehole as it progresses during reaming, eliminating the need for repeated pulling and retrieval, simplifying operation, improving construction efficiency, and adapting to dynamic reaming drilling and sampling during geotechnical exploration.

[0022] As one possible implementation method, such as Figure 1As shown, a first deep groove ball bearing 3 is sleeved at the top end of the drill core tube 1, and a second deep groove ball bearing 2 is sleeved at the bottom end of the drill core tube 1. The inner rings of the first deep groove ball bearing 3 and the second deep groove ball bearing 2 are fixedly connected to the outer wall of the drill core tube 1, and the outer rings of the first deep groove ball bearing 3 and the second deep groove ball bearing 2 are in close contact with the inner wall of the sheath tube 4.

[0023] The sheath tube 4 and the core tube 1 are rotatably connected by the first deep groove ball bearing 3 and the second deep groove ball bearing 2, which facilitates the smooth rotation of the core tube 1 within the sheath tube 4. The first deep groove ball bearing 3, the second deep groove ball bearing 2, and the core tube 1 can be connected and fixed by welding, bonding, or transition fit.

[0024] As one possible implementation method, such as Figure 1 , Figure 2 As shown, the support assembly 6 includes a support ring 601, which is fixedly sleeved on the bottom end of the drill core tube 1, and the bottom surface of the second thrust bearing 5 is in contact with the top surface of the support ring 601.

[0025] A support ring 601 is fitted onto the bottom end of the borehole core tube 1. The top surface of the support ring 601 is in close contact with the bottom surface of the second thrust bearing 5. The support ring 601 can be fixed to the bottom side wall of the borehole core tube 1 by welding. The support ring 601 supports and positions the second thrust bearing 5, preventing the second thrust bearing 5 from sliding axially. It cooperates with the first thrust bearing 7, the first retaining ring 801, the second retaining ring 802, and the contraction port 9 to position the sheath tube 4. During the rotation of the borehole core tube 1, which drives the support ring 601 to rotate, the bottom surface of the second thrust bearing 5 does not interfere with the top surface of the support ring 601, allowing the support ring 601 to rotate freely relative to the second thrust bearing 5. The inner diameter of the support ring 601 matches the outer diameter of the borehole core tube 1, allowing the borehole core tube 1 to slide through the support ring 601. The inner wall of the support ring 601 is in close contact with the outer wall of the borehole core tube 1.

[0026] As one possible implementation method, such as Figure 1 , Figure 2 As shown, a plurality of stiffening plates 602 are fixedly provided between the bottom of the support ring 601 and the outer side wall of the drill core tube 1, and the stiffening plates 602 are evenly arranged along the bottom circumference of the support ring 601.

[0027] The stiffening rib 602 strengthens the support ring 601, improving its resistance to deformation and providing better support for the second thrust bearing 5, preventing it from sliding. The stiffening rib 602 can be fixed to the support ring 601 and the drilled core tube 1 by welding. There are at least two stiffening ribs 602, such as two, three, or four. The end of the stiffening rib 602 connected to the bottom of the support ring 601 is evenly distributed along the bottom circumference of the support ring 601, and the end of the stiffening rib 602 connected to the drilled core tube 1 is evenly distributed along the outer circumference of the drilled core tube 1.

[0028] As one possible implementation method, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, a male connector 11 is provided at the top end of the drill core tube 1, and a female connector 12 is provided at the bottom end of the drill core tube 1. The two drill core tubes 1 that are connected to each other are connected through the corresponding male connector 11 and female connector 12.

[0029] For example, the outer wall of the top end of the core tube 1 is rolled with external thread to form a male connector 11, and the inner wall of the bottom end of the core tube 1 is tapped to form an internal thread that matches the external thread of the male connector 11 to form a female connector 12. Two core tubes 1 can be connected by the male connector 11 and the female connector 12 to adapt to the drilling depth. The number of core tubes 1 can be increased as the drilling depth increases.

[0030] As one possible implementation method, such as Figure 1 , Figure 2 As shown, a gap-blocking tube 603 is fixedly provided at the bottom end of the support ring 601. A circular convex ring 604 is fixedly provided on the inner wall of the bottom end of the gap-blocking tube 603. The convex ring 604 is arranged around the circumference of the gap-blocking tube 603. A rubber ring 605 is provided at the bottom end of the gap-blocking tube 603. A groove that mates with the convex ring 604 is provided on the side wall of the rubber ring 605. The convex ring 604 is engaged in the groove of the rubber ring 605.

[0031] The gap-blocking tube 603 can cover the gap at the connection of the borehole core tube 1, protecting the connection. The rubber ring 605 can improve the sealing and stability of the connection. The gap-blocking tube 603 can be welded or bonded to the bottom end of the support ring 601. The inner diameter of the rubber ring 605 matches the outer diameter of the borehole core tube 1. The borehole core tube 1 passes through the rubber ring 605, and the inner wall of the rubber ring 605 is in close contact with the outer wall of the borehole core tube 1.

[0032] As one possible implementation method, such as Figure 1 , Figure 3 , Figure 4 , Figure 5 As shown, the limiting component 8 includes a screw 805 and an arc-shaped first retaining ring 801 and a second retaining ring 802. A boss 803 extends from the lower end of the mating end of the first retaining ring 801. A threaded hole 806, which is threaded to the top of the boss 803, is provided for threaded connection with the screw 805. A pressure plate 804, which mates with the boss 803, extends from the upper end of the mating end of the second retaining ring 802. The pressure plate 804 has a through hole 807. The screw 805, the through hole 807, and the threaded hole 806 are all fitted together. The top of the drilled core tube 1... An annular contraction opening 9 is provided at the end of the first thrust bearing 7. The contraction opening 9 is located at the top of the first thrust bearing 7. The first retaining ring 801 and the second retaining ring 802 are engaged in the contraction opening 9. The first retaining ring 801 and the second retaining ring 802 are joined together to form an annular retaining ring. The inner wall of the retaining ring is in close contact with the bottom wall of the contraction opening 9. The bottom surface of the retaining ring is in close contact with the top surface of the first thrust bearing 7. The screw 805 passes through the through hole 807 of the corresponding pressure plate 804 and is fixedly connected to the threaded hole 806 of the corresponding boss 803.

[0033] After the bottom end of the sheath tube 4 is installed and positioned, the first thrust bearing 7 is fitted onto the top end of the drilled core tube 1. The first retaining ring 801 and the second retaining ring 802 are snapped into the contraction port 9, with the first retaining ring 801 and the second retaining ring 802 mating together. The pressure plate 804 of the second retaining ring 802 is located on the corresponding boss 803 of the first retaining ring 801. The through holes 807 and the threaded holes 806 are aligned one by one. The screw 805 passes through the corresponding through hole 807 and is threadedly connected and fixed to the threaded hole 806. The bottom surfaces of the first retaining ring 801 and the second retaining ring 802 are in contact with the top surface of the first thrust bearing 7, thus installing and positioning the first thrust bearing 7 to prevent it from moving axially upwards, thereby preventing the sheath tube 4 from moving upwards. The top end of the sheath tube 4 is then installed and positioned, thus positioning the sheath tube 4. The top surface of the first thrust bearing 7 will not interfere with the bottom surfaces of the first retaining ring 801 and the second retaining ring 802. The screw head size of screw 805 is larger than the inner diameter of through hole 807.

[0034] As one possible implementation method, such as Figure 3 As shown, the screw 805 is an internal hexagon screw, and the upper end of the through hole 807 of the pressure plate 804 is provided with a countersunk hole that mates with the screw head of the internal hexagon screw.

[0035] The first retaining ring 801 and the second retaining ring 802 are fixed together by hex socket screws, which has higher structural strength and reliability. After the fixed connection, the screw head of the hex socket screw is accommodated in the countersunk hole, which improves the overall integrity of the connection between the first retaining ring 801 and the second retaining ring 802.

[0036] As one possible implementation method, such as Figure 1 , Figure 3 , Figure 4 As shown, the top end of the sheath tube 4 is provided with a recessed groove 10 that cooperates with the first thrust bearing 7, and the bottom end of the first thrust bearing 7 is engaged in the recessed groove 10.

[0037] The bottom end of the first thrust bearing 7 is fitted into the recessed groove 10, with the bottom surface of the first thrust bearing 7 in close contact with the bottom surface of the recessed groove 10, and the outer ring of the bottom end of the first thrust bearing 7 in close contact with the inner wall of the recessed groove 10. The recessed groove 10 is used for the installation and positioning of the first thrust bearing 7 and the protective sleeve 4. The top end of the protective sleeve 4 is enlarged, with the inner diameter of the enlarged hole matching the outer diameter of the first thrust bearing 7, and the depth of the enlarged hole being less than the axial height of the first thrust bearing 7.

[0038] When using the support and reinforcement device for preventing borehole wall collapse in this geotechnical exploration borehole, the sheath tube 4 is rotatably connected to the borehole core tube 1 through the first deep groove ball bearing 3 and the second deep groove ball bearing 2. The second thrust bearing 5 at the bottom end of the borehole core tube 1 supports the bottom end of the sheath tube 4. The support ring 601 of the support assembly 6 supports the second thrust bearing 5. The support ring 601 prevents the second thrust bearing 5 from sliding axially, thereby preventing the sheath tube 4 from sliding axially. The first thrust bearing 7 is sleeved on the top end of the borehole core tube 1. The bottom end of the first thrust bearing 7 is embedded in the sinking groove 10. The first retaining ring 801 and the second retaining ring 802 are engaged in the contraction port 9 and fixed by screws 805. The first retaining ring 801 and the second retaining ring 802 prevent the first thrust bearing 7 from moving axially upward, thereby preventing the sheath tube 4 from moving axially upward, and positioning the sheath tube 4.

[0039] During the reaming process, the core tube 1 can be sampled, and the outer wall of the casing 4 is in close contact with the inner wall of the reaming hole, providing radial support to the inner wall of the hole and preventing hole collapse. The first deep groove ball bearing 3 and the second deep groove ball bearing 2 allow the core tube 1 to rotate freely relative to the casing 4. The casing 4 remains stationary due to the action of the first deep groove ball bearing 3 and the second deep groove ball bearing 2, avoiding torque transmission to the inner wall of the borehole and reducing disturbance to the formation of the inner wall of the borehole. The first thrust bearing 7 and the second thrust bearing 5 prevent rotational friction interference between the two ends of the casing 4 and the support ring 601, the first retaining ring 801 and the second retaining ring 802.

[0040] As the drilling depth increases, the two core tubes 1 are connected by the male connector 11 and the female connector 12 to adapt to the drilling depth. The gap-blocking tube 603 can cover the gap at the connection of the core tubes 1 and protect the connection of the core tubes 1. The rubber ring 605 can improve the sealing and stability of the connection of the core tubes 1. When it is necessary to disassemble the sheath tube 4, loosen the screw 805, take out the first retaining ring 801 and the second retaining ring 802 from the contraction port 9, and then remove the first thrust bearing 7 to disassemble the sheath tube 4.

[0041] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A support and reinforcement device for preventing borehole wall collapse in rock and soil exploration drilling, characterized in that, The system includes a core tube (1) and a sheath tube (4). The core tube (1) is rotatably fitted inside the sheath tube (4). A first thrust bearing (7) is fitted at the top of the core tube (1). A limiting component (8) is provided at the top of the first thrust bearing (7) to restrict the axial upward movement of the first thrust bearing (7). A second thrust bearing (5) is fitted at the bottom of the core tube (1). A supporting component (6) is provided at the bottom of the second thrust bearing (5) to restrict the axial downward movement of the second thrust bearing (5). The sheath tube (4) is sandwiched between the first thrust bearing (7) and the second thrust bearing (5).

2. The support and reinforcement device for preventing borehole wall collapse in rock and soil exploration drilling according to claim 1, characterized in that, The top end of the drill core tube (1) is fitted with a first deep groove ball bearing (3), and the bottom end of the drill core tube (1) is fitted with a second deep groove ball bearing (2). The inner rings of the first deep groove ball bearing (3) and the second deep groove ball bearing (2) are fixedly connected to the outer wall of the drill core tube (1), and the outer rings of the first deep groove ball bearing (3) and the second deep groove ball bearing (2) are in close contact with the inner wall of the sheath tube (4).

3. The support and reinforcement device for preventing borehole wall collapse in rock and soil exploration drilling according to claim 1, characterized in that, The limiting component (8) includes a screw (805) and an arc-shaped first retaining ring (801) and a second retaining ring (802). A boss (803) extends from the lower end of the mating end of the first retaining ring (801). A threaded hole (806) is provided at the top of the boss (803) for threaded connection with the screw (805). A pressure plate (804) mates with the boss (803) extends from the upper end of the mating end of the second retaining ring (802). The pressure plate (804) has a through hole (807). The screw (805), the through hole (807), and the threaded hole (806) are fitted together. The drilled core tube (1) The top end is provided with an annular contraction opening (9), the contraction opening (9) is located at the top end of the first thrust bearing (7), the first retaining ring (801) and the second retaining ring (802) are engaged in the contraction opening (9), the first retaining ring (801) and the second retaining ring (802) are joined to form an annular retaining ring, the inner wall of the retaining ring is in close contact with the bottom wall of the contraction opening (9), the bottom surface of the retaining ring is in close contact with the top surface of the first thrust bearing (7), the screw (805) passes through the through hole (807) of the corresponding pressure plate (804) and is fixedly connected to the threaded hole (806) of the corresponding boss (803).

4. The support and reinforcement device for preventing borehole wall collapse in rock and soil exploration drilling according to claim 3, characterized in that, The screw (805) is an internal hexagon screw, and the upper end of the through hole (807) of the pressure plate (804) is provided with a countersunk hole that mates with the screw head of the internal hexagon screw.

5. A support and reinforcement device for preventing borehole wall collapse in rock and soil exploration drilling according to claim 1, characterized in that, The support assembly (6) includes a support ring (601), which is fixedly sleeved on the bottom end of the drill core tube (1), and the bottom surface of the second thrust bearing (5) is in contact with the top surface of the support ring (601).

6. A support and reinforcement device for preventing borehole wall collapse in rock and soil exploration drilling according to claim 5, characterized in that, A number of stiffeners (602) are fixedly provided between the bottom of the support ring (601) and the outer wall of the drill core tube (1), and the stiffeners (602) are evenly arranged around the bottom of the support ring (601).

7. A support and reinforcement device for preventing borehole wall collapse in rock and soil exploration drilling according to claim 6, characterized in that, The top end of the borehole core tube (1) is provided with a male connector (11), and the bottom end of the borehole core tube (1) is provided with a female connector (12). The two borehole core tubes (1) are connected by the corresponding male connector (11) and female connector (12).

8. A support and reinforcement device for preventing borehole wall collapse in rock and soil exploration drilling according to claim 7, characterized in that, The bottom end of the support ring (601) is fixedly provided with a gap-blocking tube (603), and the inner wall of the bottom end of the gap-blocking tube (603) is fixedly provided with a circular convex ring (604). The convex ring (604) is arranged around the circumference of the gap-blocking tube (603). The bottom end of the gap-blocking tube (603) is provided with a rubber ring (605). The side wall of the rubber ring (605) is provided with a groove that cooperates with the convex ring (604). The convex ring (604) is engaged in the groove of the rubber ring (605).

9. A support and reinforcement device for preventing borehole wall collapse in rock and soil exploration drilling according to claim 1, characterized in that, The top end of the sheath tube (4) is provided with a recessed groove (10) that cooperates with the first thrust bearing (7), and the bottom end of the first thrust bearing (7) is engaged in the recessed groove (10).

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