Karst tunnel grouting simulation test device

Abstract

The utility model relates to a karst tunnel grouting simulation test device belongs to the field of geotechnical engineering grouting, including test box and the filler of setting in test box, is provided with tunnel, water bag, plastic valve pipe in filler, the inner wall fixed connection of plastic valve pipe has two limit rings, is provided with the pipe of discharging between two limit rings, the middle part of pipe of discharging is opened and has the feed hole that penetrates, the horizontal pole of sliding connection through the elastic rope connection cone sealing block is connected in the feed hole, sealing block is used for the plugging of feed hole, the top of pipe of discharging is provided with the butt joint pipe, the top of butt joint pipe is inserted and has a plurality of penetrating fixed peg, and fixed peg is with pipe of discharging screw connection, grouting mechanism sets up at one side of test box for grouting, solve the existing karst tunnel grouting device after grouting is completed, and grouting pipeline is inconvenient to remove and clean, grouting slurry solidification, spare part is difficult to use, and when the pressure in pipeline is too big, the device is easily damaged and is easy to cause the harm of test personnel.

Description

Technical Field

[0001] This utility model belongs to the field of grouting in geotechnical engineering, and relates to a grouting simulation test device for karst tunnels. Background Technology

[0002] Grouting simulation tests in karst tunnels are a key method for studying the applicability and reinforcement effect of grouting technology under karst geological conditions. In karst areas, tunnel construction often faces adverse geological conditions such as sinkholes and dissolution fissures, which can lead to tunnel structural instability or even collapse. Grouting technology in karst tunnels can effectively improve the strength and stability of the surrounding rock by filling fissures and creating channels.

[0003] Grouting is the process of displacing the air and moisture inherent in the pores and fissures of the surrounding rock with grout, thereby re-bonding the fractured rock and soil and enhancing the strength, impermeability, and thermal insulation properties of the rock and soil. Before grouting, it is necessary to make a prediction about the properties of the object to be grouted, the type of grout material to be selected, the type of grouting method to be used, and the expected grouting effect, in order to increase the controllability and reliability of the grouting process.

[0004] Due to the complexity of the actual grouting site environment and geological conditions, it is difficult to make a qualitative assessment of the grouting method, grouting materials, and grouting effect before grouting. Indoor grouting tests are an important research method for grouting technology. These tests can be used to study grouting theory and to design and verify grouting parameters. However, although existing karst tunnel grouting devices can achieve relatively optimal grouting parameters in practical use, many problems still exist. For example, the dismantling and cleaning of the grouting pipes after grouting is extremely inconvenient. Due to the solidification of the grout, a large amount of difficult-to-remove material remains on the inner wall of the pipe, making the pipe unusable. Furthermore, after the grout solidifies, the components of the device are difficult to disassemble and clean, increasing the testing cost and time. More seriously, existing devices lack effective pressure relief devices. When the pressure inside the pipe is too high, it can easily damage the entire testing device, not only affecting the smooth progress of the test but also potentially posing safety hazards to personnel and equipment. These problems seriously affect the efficiency and reliability of karst tunnel grouting simulation tests, limiting the further research and application of grouting technology in karst tunnel engineering. Utility Model Content

[0005] In view of this, in order to solve the problems of existing karst tunnel grouting devices, such as the inconvenience of dismantling and cleaning the grouting pipes after grouting is completed, the difficulty in using the components after the grout solidifies, and the easy damage to the device and injury to the test personnel when the pressure inside the pipe is too high, this utility model provides a karst tunnel grouting simulation test device.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A karst tunnel grouting simulation test device is characterized by comprising: a test chamber and a packing material disposed within the test chamber, wherein a tunnel for simulation testing is formed within the packing material, and a plastic valve pipe is disposed within the packing material on one side of the tunnel; a limiting ring is fixedly installed on the inner wall of the plastic valve pipe, and a discharge pipe is disposed on the upper side of the limiting ring, with a through-hole in the middle of the discharge pipe, and a crossbar connected to a conical sealing block via an elastic rope is slidably connected within the discharge hole, the sealing block being used to seal the discharge hole; a connecting pipe is slidably connected to the top of the discharge pipe within the plastic valve pipe, with a through hole in the middle of the connecting pipe communicating with the discharge hole, and multiple through-hole fixing bolts that can be threadedly connected to the discharge pipe are inserted circumferentially into the connecting pipe; and a grouting mechanism for grouting is disposed outside the test chamber, the grouting mechanism comprising a material bucket and a grouting slurry pump disposed on one side of the outer frame, the inlet end of the grouting slurry pump being fixedly connected to the material bucket via a pipe, the outlet end of the grouting slurry pump being fixedly connected to a grouting pipe, and the free end of the grouting pipe communicating with the through hole in the middle of the connecting pipe.

[0008] As a further embodiment of this utility model, a waste bin is connected to the outside of the grouting pipe via a branch pipe, an installation pipe, and a pressure relief pipe in sequence. A sliding rod with an installation plate sleeved on it and its free end protruding from the installation pipe is slidably connected inside the installation pipe. The installation plate is adapted to the inner wall of the installation pipe. A plug for sealing the branch pipe is fixedly connected to the end of the sliding rod inside the installation pipe. A spring is fitted on the sliding rod between the installation plate and the plug. Two screws that abut against the installation plate are threaded to the end of the installation pipe away from the branch pipe. The pressure relief pipe is fixedly installed on the bottom side of the middle part of the installation pipe.

[0009] As a further improvement of this utility model, a one-way valve is installed on the grouting pipe, and a second pressure gauge is installed on the branch pipe.

[0010] As a further improvement of this utility model, a water bladder is installed inside the filler on one side of the tunnel, and the water bladder is connected to a waste liquid tank through a drainage pipe.

[0011] As a further improvement of this utility model, a first pressure gauge and a control valve for controlling drainage are installed on one side of the drain pipe.

[0012] As a further improvement of this utility model, an outlet pipe connected to the waste liquid tank is pre-embedded inside the packing.

[0013] As a further embodiment of this utility model, an outer frame is provided on the outside of the test chamber, and multiple electric push rods are fixedly connected to the top of the outer frame. Each electric push rod output end is fixedly connected to a pressure plate for pressing the filler.

[0014] As a further embodiment of this utility model, side plates are fixedly connected to the inner walls of the outer frame, and a top plate that abuts against the test chamber is fixedly connected to one side of each side plate.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. The karst tunnel grouting simulation test device disclosed in this utility model, by installing a sealing block at the bottom of the discharge pipe, can seal the discharge pipe under the action of the elastic rope and the sealing block after grouting is completed, thereby facilitating the disassembly and cleaning of the grouting pipe, preventing the grout inside the grouting pipe from solidifying, and facilitating reuse.

[0017] 2. The karst tunnel grouting simulation test device disclosed in this utility model, by installing a branch pipe on the grouting pipe, can push open the plug on one side of the branch pipe when the pressure inside the grouting pipe is too high, thereby achieving pressure relief, preventing damage to the pipeline and equipment, and improving the safety of use.

[0018] 3. The karst tunnel grouting simulation test device disclosed in this utility model improves the pressure resistance of the test chamber and increases the test limit by installing an outer frame on the outside of the test chamber and fixing a top plate on the inner wall of the outer frame.

[0019] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a three-dimensional structural diagram of the karst tunnel grouting simulation test device of this utility model. Figure 1 ;

[0022] Figure 2 This is a three-dimensional structural diagram of the karst tunnel grouting simulation test device of this utility model. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the internal structure of the karst tunnel grouting simulation test device of this utility model;

[0024] Figure 4 This utility model Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 This is a cross-sectional view of the mounting pipe in this utility model.

[0026] In the diagram: 1. Outer frame; 2. Test chamber; 3. Side plate; 4. Top plate; 5. Electric push rod; 6. Pressure plate; 7. Material bucket; 8. Grouting pump; 9. Grouting pipe; 10. Check valve; 11. Waste liquid tank; 12. Waste material tank; 13. Discharge pipe; 14. Control valve; 15. Packing material; 16. Tunnel; 17. Water bladder; 18. Drainage pipe; 19. First pressure gauge; 20. Plastic valve pipe; 21. Limiting ring; 22. Discharge pipe; 23. Crossbar; 24. Elastic rope; 25. Sealing block; 26. Connecting pipe; 27. Fixing bolt; 28. Branch pipe; 29. ​​Second pressure gauge; 30. Installation pipe; 31. Sliding rod; 32. Plug; 33. Spring; 34. Pressure relief pipe. Detailed Implementation

[0027] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0028] like Figures 1-2 The karst tunnel grouting simulation test device shown includes: a test chamber 2 and a packing material 15 set inside the test chamber 2. The packing material 15 contains a tunnel 16, a water bladder 17, and a plastic valve pipe 20 for simulation test.

[0029] The test chamber 2 is set inside the outer frame 1. Multiple electric push rods 5 are fixedly connected to the top of the outer frame 1. The output end of each electric push rod 5 is fixedly connected to a pressure plate 6 for pressing the packing 15. When the electric push rod 5 is started, the electric push rod 5 drives the pressure plate 6 to move downward, thereby squeezing the packing 15, which can conveniently simulate actual pressure and improve the flexibility of use.

[0030] Side plates 3 are fixedly connected to the inner walls of the outer frame 1. A top plate 4 is fixedly connected to one side of each side plate 3. The top plate 4 is in contact with the test chamber 2. The cooperation between the side plates 3 and the top plate 4 is used to protect the test chamber 2.

[0031] like Figure 3 , 4As shown, a limiting ring 21 is fixedly connected to the inner wall of the plastic valve pipe 20. A discharge pipe 22 is provided between the limiting rings 21. A through inlet hole is opened in the middle of the discharge pipe 22. A crossbar 23 is slidably connected in the inlet hole. An elastic rope 24 is fixedly connected to the bottom of the crossbar 23. A conical sealing block 25 is fixedly connected to the bottom of the elastic rope 24 to seal the inlet hole. A connecting pipe 26 is provided at the top of the discharge pipe 22. Multiple through fixing bolts 27 are inserted into the top of the connecting pipe 26. The fixing bolts 27 are threadedly connected to the discharge pipe 22. After grouting is completed, the fixing bolts 27 are removed, so that the connecting pipe 26 and the discharge pipe 22 can be separated. The pressure of the grout in the plastic valve pipe 20 and the elastic rope 24 work together to make the sealing block 25 move upward, thereby sealing the discharge pipe 22. This facilitates the disassembly and cleaning of the grouting pipe 9 and prevents the grout in the grouting pipe 9 from solidifying.

[0032] The grouting mechanism is located on one side of the test chamber 2 for grouting. The grouting mechanism includes a material tank 7 and a grouting pump 8 located on one side of the outer frame 1. The inlet end of the grouting pump 8 is fixedly connected to the material tank 7 through a pipe, and the outlet end of the grouting pump 8 is fixedly connected to a grouting pipe 9. The grouting pipe 9 is fixedly connected to the connecting pipe 26. When the grouting pump 8 is started, the grouting slurry is injected into the plastic valve pipe 20 through the grouting pipe 9.

[0033] A one-way valve 10 is installed around the circumference of the grouting pipe 9 to prevent the grout from flowing back.

[0034] Especially, such as Figure 5 As shown, a branch pipe 28 is fixedly connected to one side of the grouting pipe 9. An installation pipe 30 is fixedly connected to one end of the branch pipe 28. A sliding rod 31 is slidably connected to one end of the installation pipe 30. A plug 32 is fixedly connected to one end of the sliding rod 31 to seal the branch pipe 28. An installation disc is slidably fitted around the circumference of the sliding rod 31. A spring 33 is installed between the installation disc and the plug 32 via a spring seat. When the pressure inside the grouting pipe 9 and the branch pipe 28 is too high, the plug 32 is pushed open, thereby releasing pressure, preventing damage to the pipeline and equipment, and improving safety. Two screws are threadedly connected to one end of the installation pipe 30, and the screws abut against the installation disc. A pressure relief pipe 34 is fixedly connected to the bottom of the installation pipe 30. Rotating the screws can adjust the safe pressure range, making it flexible to use. It should be noted that a second pressure gauge 29 is installed on one side of the branch pipe 28. The second pressure gauge 29 can observe the pressure inside the grouting pipe 9, facilitating understanding of the test situation.

[0035] In this invention, a drain pipe 18 is fixedly connected to the top of the water bladder 17. A first pressure gauge 19 and a control valve 14 for controlling drainage are installed on one side of the drain pipe 18. The deformation of the water bladder 17 can be observed through the first pressure gauge 19 to improve the accuracy of the test. When the pressure is too high, the water can be discharged by opening the control valve 14.

[0036] In particular, a liquid outlet pipe 13 is pre-embedded inside the packing 15, which is used to simulate and observe the liquid outlet situation of the packing 15.

[0037] It should be noted that a waste liquid tank 11 and a waste material tank 12 are provided on one side of the outer frame 1 for receiving wastewater and waste materials, respectively.

[0038] When using this karst tunnel grouting simulation test device, the connecting pipe 26 and the discharge pipe 22 are connected by the fixing bolt 27. Then, the grout pump 8 is started, and the grout is injected into the plastic valve pipe 20 through the grouting pipe 9. During the grouting process, the grouting pressure change is observed through the second pressure gauge 29. When the pressure in the grouting pipe 9 and the branch pipe 28 is too high, the plug 32 is pushed open to release the pressure, prevent damage to the pipeline and equipment, and improve the safety of use. After the grouting is completed, the fixing bolt 27 is removed to separate the connecting pipe 26 and the discharge pipe 22. The pressure of the grout in the plastic valve pipe 20 and the elastic rope 24 work together to move the sealing block 25 upward, thereby sealing the discharge pipe 22. This facilitates the disassembly and cleaning of the grouting pipe 9 and prevents the grout in the grouting pipe 9 from solidifying.

[0039] During grouting, the deformation of the water bladder 17 can be observed through the first pressure gauge 19 to improve the accuracy of the test. If the pressure is too high, it can be discharged by opening the control valve 14 and starting the electric push rod 5. The electric push rod 5 drives the pressure plate 6 to move downward, which can squeeze the filler 15, making it convenient to simulate the pressure situation of actual karst tunnel grouting and improve the flexibility of the test device.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A karst tunnel grouting simulation test device, characterized in that, include: The test chamber (2) and the packing (15) set inside the test chamber (2) are provided. A tunnel (16) for simulating the test is opened in the packing (15). A plastic valve tube (20) is set in the packing (15) on one side of the tunnel (16). A limit ring (21) is fixedly installed on the inner wall of the plastic valve tube (20). A discharge pipe (22) is set on the upper side of the limit ring (21). A through feed hole is opened in the middle of the discharge pipe (22). A cross bar (23) connected to the conical sealing block (25) by an elastic rope (24) is slidably connected in the feed hole. The sealing block (25) is used to seal the feed hole. A sliding connection is set at the top of the discharge pipe (22). The connecting pipe (26) is connected inside the plastic valve pipe (20). The connecting pipe (26) has a through hole in the middle that communicates with the feed hole. The connecting pipe (26) has multiple through bolts (27) that can be threaded to the discharge pipe (22). The outside of the test chamber (2) is equipped with a grouting mechanism for grouting. The grouting mechanism includes a material bucket (7) and a grouting pump (8) set on one side of the outer frame (1). The feed end of the grouting pump (8) is fixedly connected to the material bucket (7) through a pipe. The discharge end of the grouting pump (8) is fixedly connected to a grouting pipe (9). The free end of the grouting pipe (9) is connected to the through hole in the middle of the connecting pipe (26).

2. The karst tunnel grouting simulation test device according to claim 1, characterized in that, The grouting pipe (9) is connected to a waste box (12) in sequence through a branch pipe (28), an installation pipe (30), and a pressure relief pipe (34). A sliding rod (31) with an installation plate sleeved on it and its free end protruding from the installation pipe (30) is slidably connected inside the installation pipe (30). The installation plate is adapted to the inner wall of the installation pipe (30). A plug (32) for sealing the branch pipe (28) is fixedly connected to the end of the sliding rod (31) on the inner side of the installation pipe (30). A spring (33) is sleeved on the sliding rod (31) between the installation plate and the plug (32). Two screws that abut against the installation plate are threaded to the end of the installation pipe (30) away from the branch pipe (28). The pressure relief pipe (34) is fixedly installed on the bottom side of the middle part of the installation pipe (30).

3. The karst tunnel grouting simulation test device according to claim 2, characterized in that, A one-way valve (10) is installed on the grouting pipe (9), and a second pressure gauge (29) is installed on the branch pipe (28).

4. The karst tunnel grouting simulation test device according to claim 1, characterized in that, A water bladder (17) is installed in the filler (15) on one side of the tunnel (16), and the water bladder (17) is connected to a waste liquid tank (11) through a drain pipe (18).

5. The karst tunnel grouting simulation test device according to claim 4, characterized in that, A first pressure gauge (19) and a control valve (14) for controlling drainage are installed on one side of the drain pipe (18).

6. The karst tunnel grouting simulation test device according to claim 4, characterized in that, The packing material (15) has a pre-embedded outlet pipe (13) that is connected to the waste liquid tank (11).

7. The karst tunnel grouting simulation test device according to claim 1, characterized in that, The test chamber (2) is provided with an outer frame (1) on the outside. Multiple electric push rods (5) are fixedly connected to the top of the outer frame (1). The output end of each electric push rod (5) is fixedly connected to a pressure plate (6) for pressing the filler (15).

8. The karst tunnel grouting simulation test device according to claim 1, characterized in that, The outer frame (1) has side plates (3) fixedly connected to the inner walls of all four sides, and a top plate (4) that abuts against the test chamber (2) is fixedly connected to one side of each side plate (3).

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