Pulse grouting device and method for soil reinforcement

Abstract

The present application relates to a kind of soil reinforcement pulse grouting device and method, including slurry barrel, slurry barrel top is equipped with barrel cover, barrel cover bottom surface is equipped with baffle to separate into first chamber and second chamber in slurry barrel, first chamber and second chamber bottom are interconnected, first chamber top is connected with first air pump by air pipe and first air inlet valve, second chamber top is connected with second air pump by air pipe and second air inlet valve, the output gas pressure of first air pump and second air pump is different, first chamber and second chamber are equipped with pressing plate, pressing plate is connected with the bottom end of limit post, limit post is slidably connected with barrel cover and its top end extends to above slurry barrel, the bottom end of slurry barrel is connected with grouting pipe, grouting pipe is equipped with grouting valve to realize the closing and conduction of grouting pipe, the grouting device of the present application can realize the pulse grouting of different pressure switching, improves grouting efficiency.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering technology, specifically to a pulse grouting device and method for soil reinforcement. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] During soil grouting, increasing the grout vein density significantly increases the contact area between the grout and the soil within the same volume of soil, thereby greatly improving both the reinforcement effect and the degree of soil fragmentation. Therefore, in practical engineering applications, increasing the grout vein density can effectively improve construction results for purposes such as soil reinforcement, achieving significant improvements in areas such as strengthening weak soil and enhancing soil liquefaction resistance. There is a significant demand for this technology in tunnel foundation construction, settlement structure lifting, and landslide reinforcement.

[0004] It is understood that the static pressure grouting equipment currently used in engineering applications generally consists of a triaxial press and a pressure supply control device, and its development is relatively complete. However, static pressure grouting has the disadvantages of fewer extended cracks and high crack initiation pressure.

[0005] Pulse grouting devices can increase crack propagation and enhance fracturing effect to a certain extent. However, in traditional pulse grouting, high-pressure and zero-pressure phases alternate, meaning that one cycle includes a grouting phase at set pressure and a phase without grout injection. Compared to static pressure grouting, pulse grouting can effectively improve fracturing effect and increase the quality and quantity of crack development. However, compared to static pressure grouting, pulse grouting has lower grouting efficiency and requires a longer construction time. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a pulse grouting device and method for soil reinforcement, which improves the efficiency of grouting compared to existing pulse grouting reinforcement technologies.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, embodiments of the present invention provide a pulse grouting device for soil reinforcement, comprising a grout tank, a lid on the top of the grout tank, a partition on the bottom surface of the lid to divide the interior of the grout tank into a first chamber and a second chamber, the bottoms of the first chamber and the second chamber being interconnected, the top of the first chamber being connected to a first air pump via an air pipe and a first air inlet valve, the top of the second chamber being connected to a second air pump via an air pipe and a second air inlet valve, the output gas pressures of the first air pump and the second air pump being different, a pressure plate being provided in both the first chamber and the second chamber, the pressure plate being connected to the bottom end of a limiting post, the limiting post being slidably connected to the lid and its top end extending above the grout tank, the bottom end of the grout tank being connected to a grouting pipe, and the grouting pipe being provided with a grouting valve to realize the closing and opening of the grouting pipe.

[0008] Optionally, the top surface of the bucket lid is provided with a stirring drive component, which is connected to a stirring shaft. The stirring shaft passes through a partition and extends to below the partition. The shaft section of the stirring shaft located below the partition is provided with multiple stirring blades.

[0009] Optionally, the stirring drive is a stirring motor fixed at the center of the top surface of the bucket lid, and the output shaft of the stirring motor is connected to the stirring shaft.

[0010] Optionally, a seal is provided between the pressure plate and the partition and the inner surface of the slurry tank to achieve a seal.

[0011] Optionally, the bottom of the slurry tank is provided with a slurry inlet, which is connected to the slurry pump through a slurry inlet pipeline.

[0012] Optionally, the grouting valve is an electric ball valve.

[0013] Optionally, a manual valve is also connected to the grouting pipe, and the manual valve is set in parallel with the electric ball valve.

[0014] Optionally, a sealing element is provided between the limiting post and the barrel lid.

[0015] Optionally, a cylinder is also fixed to the top surface of the lid. A piston is provided inside the cylinder, which divides the internal space of the cylinder into a first space and a second space. The first space is connected to a first air pump, and the second space is connected to a second air pump. A first locking rod is provided on one side of the piston, passing through the first space and extending to the outside of the cylinder. The first locking rod corresponds to a limiting post that cooperates with the first chamber. A second locking rod is provided on the other side of the piston, passing through the second space and extending to the outside of the cylinder. The second locking rod corresponds to a limiting post that cooperates with the second chamber.

[0016] Secondly, embodiments of the present invention provide a method for a grouting device for soil reinforcement: a first air pump and a second air pump alternately inject gas into a grout tank, and a valve on the grouting pipe is opened; During the first air pump injection period, the first air pump injects gas into the first chamber and sends the grout into the grouting pipe through the pressure plate for grouting, forming grouting at the first set pressure; During the second air pump injection period, the second air pump injects gas into the second chamber and sends the grout into the grouting pipe through the pressure plate for grouting, forming a pulse grouting at a second set pressure. The second set pressure is less than the first set pressure, thus forming a pulse grouting with the first set pressure and the second set pressure alternating.

[0017] The beneficial effects of this invention are as follows: 1. The pulse grouting device for soil reinforcement of the present invention comprises a grout tank divided into a first chamber and a second chamber by a partition plate. Each chamber is equipped with a pressure plate, which is connected to a limiting column. The limiting column is slidably connected to the tank cover. The first chamber is connected to a first air pump, and the second chamber is connected to a second air pump. The first and second air pumps can work alternately, thereby achieving alternating high and low pressure pulse grouting through the pressure plate and limiting column. This achieves a pulse grouting effect while maintaining a stable high and low pressure difference, and allows for continuous grout injection, promoting continuous crack development and growth. Compared with ordinary pulse grouting, this effectively improves grouting efficiency and reduces construction time.

[0018] 2. The pulse grouting device for soil reinforcement of the present invention is provided with a cylinder, a piston, a first locking rod and a second locking rod. When the first air pump is working, the second locking rod can be used to press against the limiting column of the second chamber. When the second air pump is working, the first locking rod can be used to press against the limiting column of the first chamber, thereby realizing the locking of the limiting column and ensuring the stability of the output grouting pressure.

[0019] 3. The pulse grouting device for soil reinforcement of the present invention has grout for both pressure grouting in one grout tank, eliminating the need for two grout tanks, reducing the size of the equipment, and facilitating transportation when used in the laboratory or in actual engineering projects. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the slurry tank in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the assembly of the cylinder, piston, first locking rod and second locking rod in Embodiment 1 of the present invention; The components are as follows: 1. Grout tank, 2. Support column, 3. Partition plate, 4. First chamber, 5. Second chamber, 6. Mixing motor, 7. Mixing blades, 8. First air pump, 9. Second air pump, 10. First air inlet valve, 11. Second air inlet valve, 12. First pressure plate, 13. First limiting post, 14. Second pressure plate, 15. Second limiting post, 16. Grouting pipe, 17. Electric ball valve, 18. Motor, 19. Manual ball valve, 20. Grouting pipe, 21. First air pipe, 22. Second air pipe, 23. Cylinder, 24. Piston, 25. First locking rod, 26. Second locking rod, 27. Exhaust pipe, 28. Soil tank. Detailed Implementation

[0022] For ease of description, the use of the words "upper" and "lower" in this invention only indicates that they correspond to the upper and lower directions of the accompanying drawings and do not limit the structure. They are merely for the purpose of describing the invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0023] Example 1 This embodiment provides a pulse grouting device for soil reinforcement, such as... Figures 1-3 As shown, it includes a grout tank 1, which is used to hold grout for grouting reinforcement. A support column 2 is provided at the bottom of the grout tank. The support column is connected to the ground foundation and supports the grout tank 1. A lid is detachably fixed to the top opening of the grout tank 1 by bolts.

[0024] A partition 3 is provided at the center of the bottom surface of the bucket lid. The partition 3 extends into the internal space of the slurry bucket 1. The length of the partition 3 is less than the height of the slurry bucket 1. The partition 3 divides the internal space of the slurry bucket 1 into a first chamber 4 and a second chamber 5 that are interconnected at the bottom.

[0025] A stirring drive is provided at the center of the top surface of the bucket lid. The stirring drive is a stirring motor 6. The housing of the stirring motor 6 is fixed to the motor support frame. The motor support frame is fixed at the center of the upper surface of the bucket lid. The output shaft of the stirring motor 6 is connected to the stirring shaft. The stirring shaft passes through the bucket lid and extends below the partition 3 after passing through the channel provided in the middle of the partition 3.

[0026] The shaft section below the partition plate has multiple stirring blades 7 arranged at equal intervals along the circumference. The stirring blades 7 are used to stir the slurry to ensure the uniformity of the slurry.

[0027] A sealing element is provided between the stirring shaft and the passage of the bucket cover and partition 3. The sealing element can be an existing rotary sealing component, which will not be described in detail here. It is used to seal the stirring shaft and the bucket cover and partition 3.

[0028] The lid portion corresponding to the first chamber 4 is provided with a first air pipe connector, which is connected to the first air pump 8 via a first air pipe 21. The first air pump 8 is capable of injecting gas at a first set working pressure into the first chamber 4.

[0029] The lid portion corresponding to the second chamber 5 is equipped with a second air pipe connector, which is connected to the second air pump 9 via a second air pipe 22. The second air pump 9 can inject gas at a second set working pressure into the second chamber. The gas pressure output by the first air pump 8 is greater than the gas pressure output by the second air pump 9, therefore the first set working pressure is greater than the second set working pressure.

[0030] A first air inlet valve 10 is installed on the first air pipe between the first air pipe connector and the first air pump to control the opening and closing of the first air pipe.

[0031] A second air inlet valve 11 is installed on the second air pipe between the second air pipe connector and the second air pump 9 to control the opening and closing of the second air pipe.

[0032] Both the first intake valve 10 and the second intake valve 11 are electrically controlled valves and are connected to the control system, which controls their operation.

[0033] The first chamber 4 is provided with a first pressure plate 12, which is slidably connected to the inner side of the slurry tank 1 and the partition 3, and can move along the axial direction of the slurry tank 1.

[0034] A sealing element is provided between the edge of the first pressure plate 12 and the inner side of the partition plate 3 and the slurry tank 1. The sealing element can be a rubber sealing strip.

[0035] The first pressure plate 12 is fixedly connected to the bottom end of the first limiting post 13, and the first limiting post 13 passes through the barrel lid through the through hole provided in the barrel lid and is slidably connected to the barrel lid.

[0036] The axis of the first limiting column 13 is set parallel to the axis of the slurry tank 1, and the first limiting column 13 can move linearly along its own axis.

[0037] A sealing element is provided between the first limiting post 13 and the bucket lid. The sealing element can be an existing rubber sealing ring to prevent air leakage.

[0038] The second chamber 5 is provided with a second pressure plate 14, which is slidably connected to the partition 3 and the inner side of the slurry tank 1 and can move along the axial direction of the slurry tank 1. A sealing element is provided between the edge of the second pressure plate 14 and the inner side of the partition 3 and the slurry tank 1. The sealing element can be an existing rubber sealing strip, which will not be described in detail here.

[0039] The second pressure plate 14 is fixedly connected to the bottom end of the second limiting post 15. The second limiting post 15 passes through the barrel lid through the through hole provided in the barrel lid, and its top end is located above the barrel lid.

[0040] The axis of the second limiting post 15 is parallel to the axis of the slurry tank 1. The second limiting post 15 is slidably connected to the tank cover. The second limiting post 15 can move linearly along its own axis.

[0041] The bottom of the slurry tank is provided with a slurry outlet, which is connected to one end of the grouting pipe 16.

[0042] A grouting valve is installed on the grouting pipe 16. Preferably, the grouting valve is an electric valve, which is connected to the control system and can receive commands from the control system to operate. The electric valve can automatically close and open, thereby realizing the opening and closing of the grouting pipe 16. Furthermore, the electric valve is an existing electric ball valve 17, which is driven by a motor 18. Its specific structure will not be described in detail here.

[0043] A manual ball valve 19 is also connected to the grouting pipe 16, and the manual ball valve and the electric ball valve 17 are arranged in parallel.

[0044] The bottom of the slurry tank 1 is also provided with a slurry inlet, which is connected to the extraction pump through the slurry inlet pipe 20. The extraction pump is connected to the slurry source and is used to send the slurry into the slurry tank.

[0045] The bottom of the slurry tank 1 is also provided with a slurry discharge port, and a slurry discharge valve is provided at the slurry discharge port for discharging the slurry in the slurry tank.

[0046] In this embodiment, the top surface of the cylinder cover is also fixed with a cylinder body 23 by bolts. A piston 24 is provided inside the cylinder body 23. The piston 24 divides the internal space of the cylinder body 23 into a first space and a second space. One side of the piston 24 is connected to one end of the first locking rod 25. The first locking rod 25 extends to the outside of the cylinder body 23. The first locking rod 25 corresponds to the first limiting post 13. The first locking rod 25 can contact and press against the first limiting post 13 to lock the first limiting post 13.

[0047] The other side of the piston 24 is fixed to one end of the second locking rod 26. The second locking rod 26 extends to the outside of the cylinder body and corresponds to the second limiting post 15. The second locking rod 26 can contact and press against the second limiting post 15 to lock the second limiting post 15.

[0048] The first space is connected to the first air pump 8 via an air pipe, and the connection position is located downstream of the first air intake valve 10. The second space is connected to the second air pump 9 via an air pipe, and the connection position is located downstream of the second air intake valve 11.

[0049] Both the first space and the second space are equipped with exhaust pipes 27. The exhaust pipes are located on the end face of the cylinder body 23. An exhaust valve is installed at the exhaust pipe. The exhaust valve is an electric valve and is connected to the control system, which controls its operation.

[0050] The grouting pipe of this embodiment can be directly applied to soil grouting reinforcement at the construction site, and can also be applied to indoor tests. When applied to indoor tests, the grouting pipe extends into the soil tank 28 through the top of the soil tank.

[0051] In this embodiment, to ensure the locking stability of the first limiting post 13 and the second limiting post 15, both the first limiting post 13 and the second limiting post 15 include a smooth section. The top of the smooth section is provided with a serrated section with multiple tooth grooves. When the first limiting post 13 and the second limiting post 15 move to the bottom of the slurry tank, the serrated section is still located above the tank cover. The smooth section is used to slide inside the slurry tank 1. The cylinder 23 is installed on the top surface of the tank cover through a mounting bracket. The cylinder has a set height so that the first locking rod and the second locking rod can be engaged in the tooth grooves of the serrated section during the descent of the first limiting post and the second limiting post, thereby locking and fixing the first limiting post and the second limiting post.

[0052] In this embodiment, when the first air pump is working, it can use the second locking rod to press against the limiting post of the second chamber, and when the second air pump is working, it can use the first locking rod to press against the limiting post of the first chamber, thereby achieving the locking of the limiting post and ensuring the stability of the output slurry hydraulic pressure.

[0053] Example 2 This embodiment provides a working method for the pulse grouting device for soil reinforcement described in Embodiment 1, including the following steps: Step 1: Pour grout for soil reinforcement into grout tank 1 and cover the tank. At this time, under the action of grout, the first pressure plate 12 and the second pressure plate 14 float to the height of the grout surface.

[0054] Step 2: Start the first air pump 8, the second air pump 9, the stirring motor 6, and open the electric ball valve 17. The first air inlet valve 10 and the second air inlet valve 11 open alternately in a cycle. When the first air inlet valve 10 is open, the second air inlet valve 11 is closed, and when the second air inlet valve 11 is open, the first air inlet valve 10 is closed.

[0055] When the first air inlet valve 10 is opened, gas is injected into the first chamber 4 and the first space. The exhaust valve of the second space is opened, and the piston 24 moves toward the second limiting post 15, driving the second locking rod 26 to move toward the second limiting post 15. Under the action of air pressure, the second limiting post 15 is pressed and locked. After the gas is injected into the first chamber, the first pressure plate 12 is driven to press down, and the grout enters the grouting pipe 16 to achieve grouting under the first set pressure.

[0056] When the second air inlet valve 11 is opened, gas is injected into the second chamber and the second space. The exhaust valve of the first space is opened, and the piston 24 moves toward the first limiting post 13, driving the first locking rod 25 to move toward the first limiting post 13. Under the action of air pressure, the first limiting post 13 is pressed and locked. After the gas is injected into the second chamber, the second pressure plate 14 is driven to press down, and the grout enters the grouting pipe 16 to realize grouting under the second set pressure.

[0057] The above process is repeated cyclically to achieve pulse grouting with alternating first and second set pressures.

[0058] The grouting method in this embodiment, compared with traditional pulse grouting, realizes a high-low pressure alternating pulse grouting mode. It achieves the pulse grouting effect while maintaining a stable high-low pressure difference, and at the same time, it allows the grout to be continuously injected, and the cracks to continue to develop and grow. Compared with ordinary pulse grouting, it can effectively improve grouting efficiency and reduce construction time. Moreover, the grout used for grouting at both pressures is located in one grout tank, eliminating the need to set up two grout tanks, reducing the size of the equipment, and making it convenient for transfer when used in laboratories or in actual engineering projects.

[0059] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pulse grouting device for soil reinforcement, characterized in that, The device includes a slurry tank with a lid on top. A partition on the bottom of the lid divides the interior of the slurry tank into a first chamber and a second chamber. The bottoms of the first and second chambers are interconnected. The top of the first chamber is connected to a first air pump via an air pipe and a first air inlet valve. The top of the second chamber is connected to a second air pump via an air pipe and a second air inlet valve. The first and second air pumps have different output gas pressures. Each of the first and second chambers is equipped with a pressure plate, which is connected to the bottom of a limiting post. The limiting post is slidably connected to the lid and its top extends above the slurry tank. The bottom of the slurry tank is connected to a grouting pipe, which is equipped with a grouting valve to allow for the closure and opening of the grouting pipe. A sealing element is provided between the pressure plate, the partition plate, and the inner surface of the slurry tank to achieve a seal; The top surface of the barrel lid is also fixed with a cylinder body. A piston is provided inside the cylinder body. The piston divides the internal space of the cylinder body into a first space and a second space. The first space is connected to a first air pump, and the second space is connected to a second air pump. A first locking rod is provided on one side of the piston, which passes through the first space and extends to the outside of the cylinder body. The first locking rod corresponds to a first limiting post that cooperates with the first chamber. A second locking rod is provided on the other side of the piston, which passes through the second space and extends to the outside of the cylinder body. The second locking rod corresponds to a second limiting post that cooperates with the second chamber. Both the first and second limiting posts include a smooth section, and a serrated section is provided at the top of the smooth section. The first and second locking rods can be engaged in the tooth groove of the serrated section during the descent of the first and second limiting posts to lock and fix the first and second limiting posts.

2. The pulse grouting device for soil reinforcement as described in claim 1, characterized in that, The top surface of the bucket lid is provided with a stirring drive component, which is connected to a stirring shaft. The stirring shaft passes through a partition and extends to the bottom of the partition. The shaft section of the stirring shaft located below the partition is provided with multiple stirring blades.

3. The pulse grouting device for soil reinforcement as described in claim 2, characterized in that, The stirring drive is a stirring motor fixed at the center of the top surface of the bucket lid, and the output shaft of the stirring motor is connected to the stirring shaft.

4. The pulse grouting device for soil reinforcement as described in claim 1, characterized in that, The bottom of the slurry tank is equipped with a slurry inlet, which is connected to the slurry pump through a slurry inlet pipeline.

5. The pulse grouting device for soil reinforcement as described in claim 1, characterized in that, The grouting valve is an electric ball valve.

6. The pulse grouting device for soil reinforcement as described in claim 5, characterized in that, The grouting pipe is also connected to a manual valve, which is set in parallel with the electric ball valve.

7. The pulse grouting device for soil reinforcement as described in claim 1, characterized in that, A sealing element is provided between the limiting post and the bucket lid.

8. A method for operating the pulse grouting device for soil reinforcement according to any one of claims 1-7: characterized in that: The first and second air pumps alternately inject gas into the slurry tank, and the valve on the grouting pipe is opened. During the first air pump injection period, the first air pump injects gas into the first chamber and sends the grout into the grouting pipe through the pressure plate for grouting, forming grouting at the first set pressure; During the second air pump injection period, the second air pump injects gas into the second chamber and sends the grout into the grouting pipe through the pressure plate for grouting, forming a pulse grouting at a second set pressure. The second set pressure is less than the first set pressure, thus forming a pulse grouting with the first set pressure and the second set pressure alternating.

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