A grout stopper for pressure grouting of karst fissures

Abstract

This utility model relates to the field of grout stopper technology and discloses a grout stopper for pressure grouting in karst fissures. It includes a core tube, one end of which is fixedly connected to a grouting pipe. Multiple grout stopper components are arranged on the outer wall of the core tube, each component including a sealing rubber sleeve. The inner wall of each sealing rubber sleeve is fixedly connected to the outer wall of the core tube, and a wear-resistant ring is fixedly connected to the outer wall of each sealing rubber sleeve. Multiple anti-slip grooves are formed inside each wear-resistant ring, and an air inlet pipe is provided inside each sealing rubber sleeve. In this utility model, the multiple individually inflated sealing rubber sleeves can adapt to the sealing requirements of different working conditions. The wear-resistant rings ensure that the sealing rubber sleeves will not be excessively worn or damaged. This solves the problem of sealing failure and grout leakage caused by the difficulty of adapting the integral sealing body to the irregular hole walls in karst geology in existing grout stoppers, thus improving the sealing reliability and equipment reuse efficiency of grouting construction.

Description

Technical Field

[0001] This utility model relates to the field of grout stopper technology, and in particular to a grout stopper for pressure grouting of karst fissures. Background Technology

[0002] In fields such as tunnel excavation, mine construction, foundation reinforcement, and water conservancy engineering seepage prevention, karst geology, due to its complex structure including fissures and caves, is prone to engineering risks such as water inrush and collapse. Pressure grouting technology is needed to reinforce and prevent seepage in the strata. The core of pressure grouting is to inject grout under pressure into karst fissures, allowing the grout to fill the fissures and solidify, forming a complete seepage prevention and reinforcement system. The grout stopper, as a key sealing component in grouting construction, has the core function of forming a reliable seal in the borehole, preventing the grout from flowing back or leaking along the borehole, ensuring that the grouting pressure is effectively applied to the target fissure area, and ensuring that the grout fully penetrates and fills the fissure.

[0003] Currently, the grout stoppers commonly used in karst fissure pressure grouting construction are mainly divided into three types: air-filled, water-filled, and mechanical. Their structure and principle revolve around the design of "single sealing body + foundation fixing / pressurization components". Among them, the air-filled grout stopper usually consists of a central core tube, an integral rubber expansion body sleeved on the outside of the core tube, metal trays located at both ends of the expansion body, and a single pressurization port on the top. During operation, compressed air is injected into the expansion body through the pressurization port, causing the integral expansion body to expand and adhere to the borehole wall to form a seal. The structure of the water-filled grout stopper is similar to that of the air-filled type, except that the pressurization medium is replaced with water, which is used to achieve expansion and sealing by utilizing the incompressibility of water. The mechanical grout stopper relies on the structure of an integral rubber sleeve + upper and lower rigid trays + slip components. By lifting the drill rod, the trays are driven to squeeze the integral rubber sleeve, causing the rubber sleeve to expand radially. At the same time, the slip components open and clamp the borehole wall to achieve fixation and sealing.

[0004] Existing grout stoppers use an integral sealing body, which is difficult to adapt to the complex working conditions of irregular borehole walls, local enlargement, narrowing, or fractured rock ledges in karst geology. Since the integral sealing body needs to be in contact with the entire section of the borehole wall at the same time, if there is a depression, fracture, or diameter deviation in a certain area of ​​the borehole, the corresponding position of the sealing body cannot effectively fit the borehole wall, which will form a sealing gap, causing the grout to flow back or leak along the gap. Even if the sealing body can fit the borehole wall in some areas through excessive expansion, it is easy to cause the sealing body to break due to excessive local pressure, ultimately leading to the failure of the overall seal. This not only wastes grouting materials, but also reduces the grouting pressure, causing the grout to fail to fully fill the target fracture, affecting the reinforcement and seepage prevention effect of the project. Therefore, a grout stopper for karst fracture pressure grouting is proposed to solve the above problems. Summary of the Invention

[0005] To overcome the above shortcomings, this utility model provides a grout stopper for pressure grouting of karst fissures, aiming to improve the problem that existing grout stoppers, due to their integral sealing body, are difficult to adapt to the complex working conditions of irregular borehole walls, local enlargement or reduction in diameter, or fissure rock embankments in karst geology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A grout-stopping plug for pressure grouting of karst fissures includes a core tube, one end of which is fixedly connected to a grouting pipe, and multiple grout-stopping components are provided on the outer wall of the core tube. Each of the aforementioned grout-stopping components includes a sealing rubber sleeve. The inner wall of each sealing rubber sleeve is fixedly connected to the outer wall of the tube core. A wear-resistant ring is fixedly connected to the outer wall of each sealing rubber sleeve. Multiple anti-slip grooves are formed inside each wear-resistant ring. An air inlet pipe is provided inside each sealing rubber sleeve. Each air inlet pipe passes through the tube core. A drainage pipe is fixedly connected to one end of each air inlet pipe. A connecting ring is fixedly connected to the outer wall of the tube core. A connecting component is provided at one end of each drainage pipe.

[0007] As a further description of the above technical solution: Each of the connecting components includes a connecting tube and a compression ring. One end of each connecting tube is fixedly connected to the side wall of the drainage tube, and the inner wall of each compression ring is fixedly connected to the outer wall of the connecting tube.

[0008] As a further description of the above technical solution: Each of the connecting pipes has a sliding ring slidably connected to its outer wall, and the inner wall of each sliding ring is in contact with the extrusion ring.

[0009] As a further description of the above technical solution: Each of the connecting tubes is provided with multiple limiting balls inside, and each of the connecting tubes is slidably connected with a support tube inside.

[0010] As a further description of the above technical solution: Each of the support tubes is fixedly connected to a delivery tube at one end, and each of the connecting tubes is fitted with a spring on its outer wall.

[0011] As a further description of the above technical solution: One end of each spring is fixedly connected to the side wall of the compression ring, and the other end of each spring is fixedly connected to the side wall of the sliding ring.

[0012] As a further description of the above technical solution: Each of the support tubes is fixedly connected to a symmetrical upper and lower limiting ring on its outer wall. Each limiting ball engages with the gap between the multiple limiting rings, and the outer wall of each limiting ball contacts the inner wall of the sliding ring.

[0013] This utility model has the following beneficial effects: 1. In this utility model, multiple individually inflatable sealing cylinders can adapt to the sealing requirements of different working conditions. Wear-resistant rings can ensure that the sealing cylinders will not be excessively worn or damaged. Anti-slip grooves can increase the friction between the sealing cylinders and the wall surface. This solves the problem of sealing failure and grout leakage caused by the existing grout stop plugs due to the difficulty of adapting the integral sealing body to the irregular hole wall of karst geology. It improves the sealing reliability of grouting construction and the equipment reuse efficiency.

[0014] 2. In this utility model, by pressing the sliding ring to cause the compression spring to deform elastically, and then releasing the limiting ball, the limiting ball can slide freely between the connecting pipe and the limiting ring bracket, thereby achieving the effect of quickly connecting and disassembling the air intake pipe. This solves the problem of long installation and disassembly time and complicated operation of the air intake pipe under the traditional threaded connection method, greatly shortens the connection and disassembly time of the air intake pipe, and improves the installation and debugging efficiency of the slurry stop plug. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of a grout stopper for pressure grouting of karst fissures proposed in this utility model. Figure 2 This is a schematic diagram of the sealing rubber sleeve structure of a grout stopper for pressure grouting of karst fissures proposed in this utility model. Figure 3 This is a schematic diagram of the drainage pipe of a grout stopper for pressure grouting of karst fissures proposed in this utility model. Figure 4 This is a schematic diagram of the drainage pipe end of a grout stopper for pressure grouting of karst fissures proposed in this utility model. Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0016] Legend: 1. Core tube; 2. Grouting pipe; 3. Sealing sleeve; 4. Wear-resistant ring; 5. Anti-slip groove; 6. Air inlet pipe; 7. Drainage pipe; 8. Connecting ring; 9. Connecting pipe; 10. Extrusion ring; 11. Sliding ring; 12. Limiting ball; 13. Support pipe; 14. Conveying pipe; 15. Limiting ring; 16. Spring. Detailed Implementation

[0017] 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.

[0018] Reference Figure 1 - Figure 3 The present invention provides an embodiment of a grout stopper for pressure grouting of karst fissures, comprising a core 1, a grouting pipe 2 fixedly connected to one end of the core 1, the core 1 being a hollow tubular structure with both ends connected, and the grouting pipe 2 for conveying grouting slurry being fixedly connected to one end by welding; and multiple grout stopper components provided on the outer wall of the core 1 to achieve layered sealing of different sections of the borehole. Multiple grout-stopping components include sealing sleeves 3. Each sealing sleeve 3 is cylindrical and fitted onto the outside of the core 1, with its inner wall fixedly connected to the outer wall of the core 1 via a vulcanization bonding process. Its initial outer diameter is slightly smaller than the borehole inner diameter to ensure that the grout-stopping plug can be smoothly lowered to the designated position in the borehole. The inner wall of each sealing sleeve 3 is fixedly connected to the outer wall of the core 1, and a wear-resistant ring 4 is fixedly connected to the outer wall of each sealing sleeve 3. The wear-resistant ring 4 has an annular structure, and its outer circular surface smoothly transitions to the outer circular surface of the sealing sleeve 3 to prevent jamming during lowering. Each wear-resistant ring 4 has multiple anti-slip grooves 5 inside, which are arc-shaped grooves. The depth of the groove 5 is 0.5-1cm. Each sealing tube 3 is equipped with an air inlet pipe 6. The air inlet pipe 6 is arranged along the axial direction of the tube core 1, and each air inlet pipe 6 penetrates the tube wall of the tube core 1 and extends into the tube core 1. The connection between the air inlet pipe 6 and the tube core 1 is sealed with sealant to prevent slurry from seeping in. Each air inlet pipe 6 penetrates the tube core 1. One end of each air inlet pipe 6 is fixedly connected to a drainage pipe 7, one end of which is connected to the air inlet pipe 6, and the other end extends toward the outside of the tube core 1. A connecting ring 8 is fixedly connected to the outer wall of the tube core 1. Each drainage pipe 7 is equipped with a connecting component at one end for quick connection to an external air source. Reference Figure 4 and Figure 5 Each connecting component includes a connecting tube 9 and a compression ring 10. Each connecting tube 9 is straight and one end is fixedly connected to the side wall of the drainage tube 7 by welding. The interior of the connecting tube 9 is connected to the interior of the drainage tube 7. Each compression ring 10 is circular and its inner wall is fixedly connected to the outer wall of the connecting tube 9 near the end of the drainage tube 7 by interference fit. The outer diameter of the compression ring 10 is larger than the outer diameter of the connecting tube 9, forming an annular protrusion structure. One end of each connecting tube 9 is fixedly connected to the side wall of the drainage tube 7, and the inner wall of each compression ring 10 is fixedly connected to the outer wall of the connecting tube 9. Each connecting pipe 9 has a sliding ring 11 slidably connected to its outer wall. The sliding ring 11 is circular, and its inner diameter matches the outer diameter of the connecting pipe 9, forming a mating structure. The inner wall of each sliding ring 11 is in contact with the compression ring 10. Each connecting pipe 9 has multiple limiting balls 12 inside, the diameter of which is slightly larger than the wall thickness of the connecting pipe 9, ensuring that the limiting balls 12 can partially extend out of the inner or outer wall of the connecting pipe 9. Each connecting pipe 9 also has a supporting pipe 13 slidably connected inside, the outer diameter of which matches the inner diameter of the connecting pipe 9. One end of the supporting pipe 13 extends to the outside of the connecting pipe 9, and the other end is located inside the connecting pipe 9. Each supporting pipe 13 has a conveying pipe 14 fixedly connected to one end, the inner diameter of which is the same as the inner diameter of the supporting pipe 13. To ensure stable airflow delivery, each connecting pipe 9 is fitted with a spring 16 on its outer wall. One end of each spring 16 is fixedly connected to the side wall of the extrusion ring 10 away from the drainage pipe 7 by welding, and the other end of each spring 16 is fixedly connected to the side wall of the sliding ring 11 near the extrusion ring 10 by welding. The spring force of the spring 16 pushes the sliding ring 11 to always maintain contact with the limiting ball 12. One end of each spring 16 is fixedly connected to the side wall of the extrusion ring 10, and the other end of each spring 16 is fixedly connected to the side wall of the sliding ring 11. Each support pipe 13 is fixedly connected with symmetrical upper and lower limiting rings 15 on its outer wall. Each limiting ball 12 is engaged with the gap between multiple limiting rings 15, and the outer wall of each limiting ball 12 is in contact with the inner wall of the sliding ring 11.

[0019] Working principle: When using the grout stopper for karst fissure pressure grouting, firstly, by pulling the sliding ring 11, the sliding ring 11 slides against the outer wall of the connecting pipe 9, thereby compressing the spring 16 and causing the spring 16 to undergo elastic deformation and store elastic potential energy. Then, by inserting the support pipe 13 into the connecting pipe 9, the force of pulling the sliding ring 11 is released, causing the spring 16 to return to its original position, which in turn causes the sliding ring 11 to return to its original position, thereby compressing the limiting ball 12 and locking the limiting ball 12 between the limiting rings 15, achieving rapid connection to the outer wall. The function of the main pipe and drainage pipe 7 provides convenience for users. After the connection is completed, gas is introduced into the interior of multiple different drainage pipes 7 through an external inflation device, thereby driving different sealing rubber cylinders 3 to expand. This allows them to adapt to irregular hole walls and achieve a highly efficient sealing effect. At the same time, when the sealing rubber cylinder 3 expands, it will also drive the wear-resistant ring 4 to contact the hole wall, thereby providing protection for the sealing rubber cylinder 3 and preventing excessive wear and damage. Meanwhile, the anti-slip groove 5 can increase the friction between the wear-resistant ring 4 and the hole wall, ensuring its stability.

Claims

1. A grout stopper for pressure grouting in karst fissures, comprising a core tube (1), characterized in that: One end of the core tube (1) is fixedly connected to a grouting pipe (2), and multiple grout-stopping components are provided on the outer wall of the core tube (1). Each of the aforementioned grout-stopping components includes a sealing tube (3), the inner wall of each sealing tube (3) is fixedly connected to the outer wall of the core tube (1), the outer wall of each sealing tube (3) is fixedly connected to a wear-resistant ring (4), each wear-resistant ring (4) has multiple anti-slip grooves (5) inside, each sealing tube (3) is provided with an air inlet pipe (6), each air inlet pipe (6) is provided through the core tube (1), one end of each air inlet pipe (6) is fixedly connected to a drainage pipe (7), the outer wall of the core tube (1) is fixedly connected to a connecting ring (8), and one end of each drainage pipe (7) is provided with a connecting component.

2. The grout stopper for pressure grouting of karst fissures according to claim 1, characterized in that: Each of the connecting components includes a connecting tube (9) and a compression ring (10), one end of each connecting tube (9) is fixedly connected to the side wall of the drainage tube (7), and the inner wall of each compression ring (10) is fixedly connected to the outer wall of the connecting tube (9).

3. The grout stopper for pressure grouting of karst fissures according to claim 2, characterized in that: Each of the connecting pipes (9) has a sliding ring (11) slidably connected to its outer wall, and the inner wall of each sliding ring (11) is in contact with the extrusion ring (10).

4. A grout stopper for pressure grouting of karst fissures according to claim 3, characterized in that: Each of the connecting tubes (9) is provided with multiple limiting balls (12), and each of the connecting tubes (9) is slidably connected with a support tube (13).

5. A grout stopper for pressure grouting of karst fissures according to claim 4, characterized in that: Each of the support tubes (13) is fixedly connected to a delivery tube (14) at one end, and each of the connecting tubes (9) is fitted with a spring (16) on its outer wall.

6. A grout stopper for pressure grouting of karst fissures according to claim 5, characterized in that: One end of each spring (16) is fixedly connected to the side wall of the compression ring (10), and the other end of each spring (16) is fixedly connected to the side wall of the sliding ring (11).

7. A grout stopper for pressure grouting of karst fissures according to claim 6, characterized in that: Each of the support tubes (13) has a fixedly connected upper and lower symmetrical limiting rings (15) on its outer wall. Each limiting ball (12) is engaged with the gap between the multiple limiting rings (15). The outer wall of each limiting ball (12) is in contact with the inner wall of the sliding ring (11).

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