Engineering geology drilling plugging device

Abstract

The utility model relates to the technical field of engineering geology drilling, and discloses an engineering geology drilling plugging device which comprises a sleeve, an inner pipe is slidably connected into the sleeve, a first piston rod is fixedly connected to the bottom end of the inner pipe, a first piston is connected to the bottom end of the first piston rod, and a first cylinder is connected to the outer surface of the first piston in a sleeved mode. The bottom end of the first barrel is in threaded connection with a bent pipe, one end of the bent pipe is fixedly connected with a first rubber sleeve, the outer surface of the sleeve is in threaded connection with a barrel connector, and one end of the barrel connector is fixedly connected with a second barrel. The rubber sleeve is hydraulically driven to expand to be attached to the inner wall of a drill hole, an upper sealing area and a lower sealing area are formed, leakage stopping agents can be effectively prevented from overflowing from a gap between the sleeve and the hole wall, material waste is reduced, and leakage stopping efficiency is improved; and through the matching design of the spring pre-tightening force and the pumping pressure, it is ensured that the sealing and discharging processes are accurately started after the device reaches the preset pressure, and the situation that the leaking stoppage effect is affected due to too early or too late action is avoided.

Description

Technical Field

[0001] This utility model relates to the field of engineering geological drilling technology, specifically to an engineering geological drilling plugging device. Background Technology

[0002] Geological drilling is an indispensable technical means in fields such as engineering geological exploration, mineral resource exploration, and geological disaster prevention. During construction, drilling needs to penetrate complex geological structures, such as fractured rock masses, fracture zones, or karst formations, to obtain physical and mechanical parameters of the soil and rock, groundwater information, or to construct engineering structures. However, such formations often have high porosity, high permeability, or interconnected channels, leading to significant leakage of flushing fluid or cement slurry during drilling. This not only wastes materials and increases construction costs but may also induce borehole instability, collapse, and even affect project progress and safety.

[0003] According to a search, Chinese patent document CN220504993U discloses an engineering geological borehole plugging device. Bolts and abutments secure the membrane and connecting shoulder. The expansion rubber sleeve, made of a soft material, can be folded, allowing it to be placed inside a steel hoop. As the expansion rubber sleeve moves downwards, the steel hoop and membrane protect it. The borehole and connecting shoulder allow cement grout to be injected into the expansion rubber sleeve. The overflowing grout enters the area between the expansion rubber sleeve and the borehole wall where the leak is plugged. The solidified grout bonds the expansion rubber sleeve to the borehole wall, including the areas above and below the plugged area, forming a sealed layer composed of solidified cement grout and rubber.

[0004] However, in actual use, the outer wall of the steel hoop of the aforementioned sealing device cannot fit snugly against the inner wall of the borehole. This causes the sealing agent to spread upwards from the pores during grouting, prolonging the sealing process and wasting a large amount of sealing agent in pores that do not require sealing. Therefore, we propose an engineering geological borehole sealing device to solve these problems. Utility Model Content

[0005] Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides an engineering geological borehole plugging device that can adhere closely to the borehole wall during plugging, thereby reducing waste of plugging agent and ensuring the plugging effect, thus solving the aforementioned technical problems.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: an engineering geological borehole sealing device, comprising a casing, an inner tube slidably connected inside the casing, a piston rod 1 fixedly connected to the bottom end of the inner tube, a first piston connected to the bottom end of the first piston rod, a cylinder 1 sleeved on the outer surface of the first piston, a bent tube threadedly connected to the bottom end of the cylinder 1, a first rubber sleeve fixedly connected to one end of the bent tube, a cylinder connector threadedly connected to the outer surface of the casing, a cylinder 2 fixedly connected to one end of the cylinder connector, a second piston 2 slidably connected inside the cylinder 2, a piston rod 2 connected inside the second piston, a thin tube connector fixedly connected to the bottom end of the cylinder 2, a second rubber sleeve fixedly connected to the bottom end of the thin tube connector, a circular hole opened on the outer surface of the inner tube, a sealing agent venting hole opened on the outer surface of the casing, and a spring sleeved on the outer surface of the first piston rod.

[0009] Preferably, the top end of the spring abuts against the inner tube, and the bottom end of the spring abuts against the end cap of the cylinder, and the preload of the spring is greater than the initial pumping pressure of the sealing agent.

[0010] Preferably, a guide groove is provided on the inner wall of the sleeve, and a guide block is fixedly connected to the outer wall of the inner tube, and the guide block slides in contact with the guide groove of the sleeve.

[0011] Preferably, hydraulic oil is injected into the interior of the first and second cylinders, and four limiting rings are fixedly connected to the outer wall of the sleeve, wherein two limiting rings are fitted with the first rubber sleeve, and the other two limiting rings are fitted with the second rubber sleeve.

[0012] Preferably, the wall thickness of the first rubber sleeve and the second rubber sleeve is in the range of 5-8 mm, and the outer surfaces of the first rubber sleeve and the second rubber sleeve are provided with annular reinforcing ribs.

[0013] Preferably, a threaded tube head is fixedly connected to the top of the casing, the threaded tube head is used to connect the drill rod, and the diameter of the plugging agent drain hole is larger than the diameter of the round hole.

[0014] Compared with the prior art, this utility model provides an engineering geological borehole plugging device, which has the following beneficial effects:

[0015] This invention utilizes hydraulically driven rubber sleeve expansion to conform to the inner wall of the borehole, forming upper and lower sealing areas. This effectively prevents leakage of the sealing agent from the gap between the sleeve and the borehole wall, reducing material waste and improving sealing efficiency. The coordinated design of spring preload and pumping pressure ensures that the device accurately starts the sealing and discharge process after reaching the predetermined pressure, avoiding premature or delayed action that could affect the sealing effect. The structural design of the guide groove and guide block ensures smooth sliding of the inner tube, preventing displacement that could lead to sealing failure and improving the operational stability of the device. The constraint effect of the limiting ring on the rubber sleeve ensures uniform expansion, enhancing sealing reliability. At the same time, the annular reinforcing rib improves the sleeve's resistance to compression and extends its service life. The design of the sealing agent discharge hole diameter being larger than that of a circular hole reduces flow resistance, reduces the risk of blockage, and ensures that the sealing agent acts on the leakage area in a timely and efficient manner, enhancing the continuity and reliability of the sealing operation. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the structure of this utility model;

[0018] Figure 3 The structure of this utility model Figure 2 A magnified view of part A in the diagram;

[0019] Figure 4 The structure of this utility model Figure 2 A magnified view of part B in the diagram.

[0020] The components are: 1. Sleeve; 2. Inner tube; 3. Piston rod one; 4. Piston No. 1; 5. Cylinder one; 6. Bending tube; 7. First rubber sleeve; 8. Cylinder joint; 9. Cylinder two; 10. Piston No. 2; 11. Piston rod two; 12. Thin tube joint; 13. Second rubber sleeve; 14. Round hole; 15. Leakage sealant vent hole; 16. Spring; 17. Limiting ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-4A hole sealing device for engineering geological drilling includes a casing 1, an inner tube 2 slidably connected inside the casing 1, a piston rod 3 fixedly connected to the bottom end of the inner tube 2, a first piston 4 connected to the bottom end of the piston rod 3, a cylinder 5 sleeved on the outer surface of the first piston 4, a bent pipe 6 threadedly connected to the bottom end of the cylinder 5, a first rubber sleeve 7 fixedly connected to one end of the bent pipe 6, a cylinder connector 8 threadedly connected to the outer surface of the casing 1, a cylinder 9 fixedly connected to one end of the cylinder connector 8, a second piston 10 slidably connected inside the cylinder 9, a piston rod 11 connected inside the second piston 10, a thin tube connector 12 fixedly connected to the bottom end of the cylinder 9, a second rubber sleeve 13 fixedly connected to the bottom end of the thin tube connector 12, a round hole 14 opened on the outer surface of the inner tube 2, a sealing agent vent hole 15 opened on the outer surface of the casing 1, and a spring 16 sleeved on the outer surface of the piston rod 3.

[0023] Specifically, the top of the spring 16 abuts against the inner tube 2, and the bottom of the spring 16 abuts against the end cap of the cylinder 5. The preload of the spring 16 is greater than the initial pumping pressure of the sealant.

[0024] Specifically, a guide groove is provided on the inner wall of the sleeve 1, and a guide block is fixedly connected to the outer wall of the inner tube 2. The guide block slides in contact with the guide groove of the sleeve 1.

[0025] The advantage is that when the casing 1 enters the borehole and approaches the leakage point, the plugging agent vent 15 is initially blocked by the inner tube 2. The top of the casing 1 is connected to the drill rod. The plugging agent is pumped from the ground into the drill rod and then into the casing 1. Under the pumping pressure, the plugging agent pushes the inner tube 2 downward. The inner tube 2 drives the piston rod 3 to move downward synchronously, and the piston rod 3 compresses the spring 16. At this time, the first piston 4 moves downward with the piston rod 3, squeezing the hydraulic oil in the cylinder 5. The hydraulic oil enters the first rubber sleeve 7 through the bent pipe 6. Due to the pressure of the hydraulic oil, the first rubber sleeve 7 expands towards the outer circumference under the limitation of the two limiting rings 17. In this way, the outer wall of the first rubber sleeve 7 tightly fits the inner wall of the borehole, forming a sealing interface and preventing the plugging agent from overflowing downward from the gap between the casing 1 and the borehole wall.

[0026] Specifically, hydraulic oil is injected into the interior of cylinder 1 5 and cylinder 2 9, and four limiting rings 17 are fixedly connected to the outer wall of sleeve 1. Two of the limiting rings 17 are fitted with the first rubber sleeve 7, and the other two limiting rings 17 are fitted with the second rubber sleeve 13.

[0027] Specifically, the wall thickness of the first rubber sleeve 7 and the second rubber sleeve 13 ranges from 5 to 8 mm, and the outer surfaces of the first rubber sleeve 7 and the second rubber sleeve 13 are provided with annular reinforcing ribs.

[0028] The advantage is that when the casing 1 approaches the location of the borehole leakage, the plugging agent cannot be discharged in the initial state because the inner tube 2 blocks the plugging agent vent 15. Under the action of pumping pressure, the inner tube 2 is pushed downward, which drives the piston rod 3 to compress the spring 16. At the same time, the plugging agent enters the cylinder joint 8 through the inside of the casing 1 and then flows into the cylinder 9. Since the cylinder 9 is filled with hydraulic oil, the plugging agent squeezes the second piston 10, pushing it to slide downward in the cylinder 9, thereby squeezing the hydraulic oil in the cylinder 9. The hydraulic oil enters the second rubber sleeve 13 through the thin tube joint 12. Under the action of oil pressure, the second rubber sleeve 13 expands outward. Its outer wall is constrained by the limiting ring 17, and it fits evenly and tightly against the inner wall of the borehole to form a sealing area, preventing the subsequently injected plugging agent from spreading upward from the gap between the casing 1 and the borehole wall, reducing plugging agent waste and improving the plugging effect.

[0029] Specifically, a threaded pipe head is fixedly connected to the top of the casing 1. The threaded pipe head is used to connect the drill rod, and the diameter of the plugging agent drain hole 15 is larger than the diameter of the round hole 14.

[0030] The advantage is that the diameter of the plugging agent vent 15 is larger than that of the round hole 14, which allows the plugging agent to be discharged more smoothly from the plugging agent vent 15 after entering the annular space between the sleeve 1 and the inner tube 2 through the round hole 14. The larger vent diameter helps to reduce the flow resistance when the plugging agent is discharged, avoids pressure accumulation due to the small orifice diameter, and ensures that the plugging agent can be sprayed out from the plugging agent vent 15 near the leakage location in a timely and efficient manner after reaching the predetermined pumping pressure, and accurately act on the leakage area.

[0031] In use, firstly, the casing 1 is connected to the drill rod through the top threaded pipe head and inserted into the borehole, approaching the leakage location. At this time, the inner tube 2 blocks the leak hole 15 of the sealing agent, the spring 16 is in a pre-tightened state, and the first rubber sleeve 7 and the second rubber sleeve 13 are not expanded. Then, the sealing agent is pumped from the ground into the casing 1 through the drill rod. The initial pumping pressure is less than the pre-tightening force of the spring 16. The sealing agent pushes the inner tube 2 to slide downward along the guide groove on the inner wall of the casing 1, which drives the piston rod 3 to compress the spring 16. At the same time, the first piston 4 squeezes the hydraulic oil in the cylinder 5. The hydraulic oil passes through the bent pipe 6 to make the first rubber sleeve 7 between the two limiting rings 17. The sealant expands outwards, tightly adhering to the inner wall of the borehole. Subsequently, the sealant enters the sleeve joint 8 and the second cylinder 9 through the inside of the casing 1, squeezing the second piston 10 to slide downwards. The hydraulic oil in the second cylinder 9 is injected into the second rubber sleeve 13 through the thin tube joint 12, causing it to expand and adhere to the inner wall of the borehole between the other two limiting rings 17, forming upper and lower sealing areas. Finally, when the inner tube 2 moves down to align the round hole 14 with the sealant drain hole 15, since the diameter of the drain hole 15 is larger than that of the round hole 14, the sealant enters the annular space between the casing 1 and the inner tube 2 through the round hole 14, and then is efficiently sprayed out from the drain hole 15, accurately filling the leakage area and completing the sealant operation.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hole sealing device for engineering geological drilling, comprising a casing (1), characterized in that: The sleeve (1) is internally slidably connected to an inner tube (2). A piston rod (3) is fixedly connected to the bottom end of the inner tube (2). A piston (4) is connected to the bottom end of the piston rod (3). A cylinder (5) is sleeved on the outer surface of the piston (4). A bent tube (6) is threadedly connected to the bottom end of the cylinder (5). A first rubber sleeve (7) is fixedly connected to one end of the bent tube (6). A sleeve connector (8) is threadedly connected to the outer surface of the sleeve (1). A sleeve connector (8) is fixedly connected to one end of the sleeve connector (8). The second cylinder (9) has a second piston (10) slidably connected inside it. The second piston (10) has a piston rod (11) connected inside it. The bottom end of the second cylinder (9) is fixedly connected to a thin tube connector (12). The bottom end of the thin tube connector (12) is fixedly connected to a second rubber sleeve (13). The outer surface of the inner tube (2) is provided with a round hole (14). The outer surface of the sleeve (1) is provided with a sealing agent vent hole (15). The outer surface of the piston rod (3) is sleeved with a spring (16).

2. The engineering geological borehole plugging device according to claim 1, characterized in that: The top end of the spring (16) abuts against the inner tube (2), and the bottom end of the spring (16) abuts against the end cap of the cylinder (5). The preload of the spring (16) is greater than the initial pumping pressure of the sealant.

3. The engineering geological borehole plugging device according to claim 1, characterized in that: A guide groove is provided on the inner wall of the sleeve (1), and a guide block is fixedly connected to the outer wall of the inner tube (2). The guide block slides in contact with the guide groove of the sleeve (1).

4. The engineering geological borehole plugging device according to claim 1, characterized in that: Hydraulic oil is injected into the interior of the first cylinder (5) and the second cylinder (9). Four limiting rings (17) are fixedly connected to the outer wall of the sleeve (1). Two of the limiting rings (17) are attached to the first rubber sleeve (7), and the other two limiting rings (17) are attached to the second rubber sleeve (13).

5. The engineering geological borehole plugging device according to claim 1, characterized in that: The wall thickness of the first rubber sleeve (7) and the second rubber sleeve (13) ranges from 5 to 8 mm, and the outer surfaces of the first rubber sleeve (7) and the second rubber sleeve (13) are provided with annular reinforcing ribs.

6. The engineering geological borehole plugging device according to claim 1, characterized in that: The top of the casing (1) is fixedly connected to a threaded pipe head, which is used to connect the drill rod. The diameter of the plugging agent drain hole (15) is larger than the diameter of the round hole (14).

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