Pulsation vacuum reinforcing device for soft soil foundation

Abstract

The utility model discloses a soft soil foundation pulsation vacuum reinforcing device which comprises a sealing assembly, a plurality of drainage plates, a plurality of horizontal filter pipes, a main pipeline and a pulsation vacuum system, the sealing assembly is used for being laid on the soil surface of a soft soil foundation to be reinforced, and the horizontal filter pipes are located below the sealing assembly. One end of the horizontal filter pipe penetrates through the sealing assembly and is communicated and connected with a main pipeline located outside the sealing assembly, the main pipeline is communicated and connected with a pulsating vacuum system, the horizontal filter pipe is communicated and connected with a drainage plate, the drainage plate is vertically arranged in the depth direction of the soft soil foundation, and the pulsating vacuum system is used for adjusting the vacuum degree in the soft soil foundation to be reinforced based on the vacuum degree in the soft soil foundation to be reinforced. And the acting power is adjusted, so that the vacuum degree in the soft soil foundation to be reinforced is maintained to fluctuate up and down within the preset vacuum threshold value range. Automatic control and correction of pulsation vacuum pressure are achieved, the operation frequency of opening and closing the vacuum pump is greatly reduced, and permeability of soft soil is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of soft soil reinforcement processing, in particular to a pulsating vacuum reinforcement device for a soft soil foundation. Background Art

[0002] Soft soil usually refers to fine-grained soil with high natural water content, large porosity, high compressibility and low shear strength that is injected into coastal areas, lakes, valleys, river beaches and other areas. Soft soil has the characteristics of high natural water content, large natural porosity, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, high sensitivity, high disturbance, poor permeability, complex layered distribution of soil layers, and large differences in physical and mechanical properties between layers. Due to these characteristics, soft soil has low strength and large subsidence. If it is directly applied to transportation construction projects such as roads and bridges, it will bring great harm to transportation construction projects and have a great impact on construction and use.

[0003] In order to apply soft soil to traffic construction projects, that is, to reduce the speed of engineering on soft soil foundations, it is necessary to reinforce the soft soil foundation. The vacuum preloading method is a relatively mature technology for soft soil reinforcement. The vacuum preloading method requires laying a sand cushion layer on the surface of the soft soil foundation to be reinforced, and then burying a vertical drainage pipe along the depth of the soft soil foundation, and then laying an airtight sealing film or other airtight sealing materials on the surface of the soft soil foundation to isolate the laid soft soil foundation from the atmosphere. After passing through the film, the vertical drainage pipe is connected to the vacuum pump and drainage pump located on the soft soil foundation or the periphery of the soft soil foundation. The vacuum pump is used to evacuate the soft soil foundation for treatment, so that the soft soil foundation sealed under the film under the atmospheric pressure is subjected to negative pressure. Under the action of negative pressure, the pore water in the soft soil foundation gradually penetrates into the vertical drainage pipe, and the water in the vertical drainage pipe is discharged from the soft soil foundation through the drainage pump, thereby achieving soil drainage and consolidation of the soft soil foundation and increasing its strength.

[0004] Among the existing technologies for vacuum preloading to reinforce soft soil foundations, most belong to the principle of static consolidation. In the later stage of reinforcement, soil columns will be formed around the vertical drainage pipes. Due to the existence of soil columns, the reinforcement effect on fine-grained soft soil with low permeability is poor. In this way, the reinforced soft soil is difficult to meet the requirements of engineering applications.

[0005] In addition, in the existing vacuum preloading technology for reinforcing soft soil foundations, in order to form a vacuum and maintain the vacuum pressure, it is often necessary to first start a large number of vacuum pumps to draw a vacuum, so as to form a vacuum in a large area of ​​the soft soil foundation. After the vacuum pressure of the soft soil foundation reaches a set value, some vacuum pumps are shut down to reduce the vacuum pressure. After it is lower than the set value, the shut-down vacuum pumps need to be restarted. In the process of the vacuum pressure being around the set value, the vacuum pump needs to be repeatedly turned on and off, and the operation of turning on and off the vacuum pump is frequent and the frequency is very high. In addition, a different number of vacuum pumps are turned on and off each time, which causes the vacuum pressure to be redistributed, and the vacuum pressure is evenly distributed, thereby affecting the reinforcement effect of the soft soil foundation. Utility Model Content

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a pulsating vacuum reinforcement device for soft soil foundation, which can solve the problems described in the background technology.

[0007] The technical solution to achieve the purpose of the utility model is: a pulsating vacuum reinforcement device for soft soil foundation, including a sealing component, a plurality of drainage plates, a plurality of horizontal filter pipes, a main pipeline and a pulsating vacuum system, wherein the sealing component is used for laying on the soil surface of the soft soil foundation to be reinforced.

[0008] Each horizontal filter tube is located below the sealing assembly. One end of the horizontal filter tube passes through the sealing assembly and is connected to the main pipeline outside the sealing assembly. The main pipeline is connected to the pulsating vacuum system. The horizontal filter tube is connected to the drainage board, which is vertically arranged along the depth direction of the soft soil foundation.

[0009] The pulsating vacuum system is used to adjust the work power based on the vacuum degree in the soft soil foundation to be reinforced, so that the vacuum degree in the soft soil foundation to be reinforced fluctuates within a preset vacuum threshold range.

[0010] The pulsating vacuum system includes a drive assembly,

[0011] The driving assembly includes a motor, a crankshaft, a push rod and a cylinder. The cylinder includes a piston and a piston cavity. The piston is located in the piston cavity. The motor rotor of the motor is connected to one end of the crankshaft. The other end of the crankshaft is rotatably connected to one end of the push rod. The other end of the push rod is rotatably connected to the piston.

[0012] The motor rotor is connected to the end of the crankshaft that is offset from the center position.

[0013] Further, the horizontal filter tube passes through the sealing assembly horizontally.

[0014] Furthermore, the horizontal filter tubes are arranged in parallel and at intervals.

[0015] Furthermore, each horizontal filter pipe is distributed along the lateral or longitudinal extension of the soft soil foundation.

[0016] Furthermore, the drainage boards are arranged in parallel and at intervals, and the lengths of the drainage boards are the same or different.

[0017] Furthermore, it also includes an isolation component, which is used to seal and isolate the soft soil foundation to be reinforced and the soft soil foundation without reinforcement.

[0018] Furthermore, the pulsating vacuum system further includes a gas-water separator, a first vacuum pump, a negative pressure accumulator, a second vacuum pump, a first electrically controlled valve, a second electrically controlled valve and a control terminal. The first vacuum pump, the second vacuum pump, the first electrically controlled valve and the second electrically controlled valve are all electrically connected to the control terminal. The control terminal is used to open and close the first vacuum pump, the second vacuum pump, the first electrically controlled valve and the second electrically controlled valve.

[0019] The output end of the driving component is connected to the air-water separator. The driving component is used to deliver and extract air in the air-water separator through the first pipeline to increase or decrease the vacuum degree in the air-water separator, so as to achieve the vacuum degree in the soft soil foundation to be reinforced to fluctuate within the preset vacuum threshold range.

[0020] The main pipeline is connected to the gas-water separator, and the first electric control valve is installed on the path where the main pipeline is connected to the gas-water separator.

[0021] The first vacuum pump is connected to the gas-water separator, the gas-water separator and the first vacuum pump are both connected to the negative pressure accumulator, and the second vacuum pump is connected to the negative pressure accumulator.

[0022] The second electric control valve is installed on the path connecting the negative pressure accumulator with the first vacuum pump and the gas-water separator.

[0023] The output end of the cylinder is communicated with the gas-water separator.

[0024] Furthermore, the output end of the cylinder is connected to the gas-water separator through a first pipeline, the main pipeline is connected to the gas-water separator through a second pipeline, the gas-water separator and the first vacuum pump are both connected to the negative pressure accumulator through a third pipeline, the negative pressure accumulator is connected to the second vacuum pump through a pipeline, and the second electrically controlled valve is on the third pipeline.

[0025] Furthermore, a first pressure gauge is installed on the gas-water separator, and the first pressure gauge is a digital vacuum pressure gauge. The gas-water separator also includes a second pressure gauge, and the second pressure gauge is installed on the third pipeline.

[0026] Furthermore, the curved rod is in the shape of a straight line, and the motor shaft is connected to an end of the curved rod that deviates from the midpoint.

[0027] The beneficial effects of the utility model are as follows: the utility model can deliver pulsating vacuum pressure to soft soil foundations, and realize automatic control and correction of the pulsating vacuum pressure, greatly reducing the operating frequency of starting and closing the vacuum pump, not only improving the vacuum preloading consolidation drainage rate and drainage speed, increasing the consolidation drainage volume, but also improving the permeability of soft soil, improving the vacuum preloading reinforcement effect, and achieving better soft soil reinforcement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the process of the soft soil foundation reinforcement method;

[0029] Figure 2 A schematic diagram of applying a soft soil foundation reinforcement device to a soft soil foundation;

[0030] Figure 3 It is a structural schematic diagram of some components of the soft soil foundation reinforcement device;

[0031] Figure 4 It is a structural schematic diagram of some components of the soft soil foundation reinforcement device;

[0032] Figure 5 It is a schematic diagram of the connection between the horizontal filter tube, the main pipeline and the pulsating vacuum system;

[0033] Figure 6 Schematic diagram of vacuum pressure change of soft soil foundation to be reinforced;

[0034] In the figure, 1 is isolation assembly, 2 is soft soil, 3 is drainage board, 4 is soil surface, 5 is horizontal filter tube, 6 is sealing assembly, 7 is main pipeline, 8 is driving assembly, 9 is push rod, 10 is piston, 11 is cylinder, 12 is first electrically controlled valve, 13 is gas-water separator, 14 is first vacuum pump, 15 is negative pressure accumulator, 16 is second electrically controlled valve, 17 is first pressure gauge, 18 is control terminal, 19 is crankshaft, 20 is motor, 21 is second vacuum pump, 22 is second pressure gauge, 23 is crankshaft movement direction, 24 is piston movement direction, 101 is pulsating vacuum system. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific implementation plans:

[0036] like Figure 2-Figure 4 As shown, a pulsating vacuum reinforcement device for a soft soil foundation includes a sealing component 6, a plurality of drainage boards 3, a plurality of horizontal filter tubes 5, a main pipeline 7 and a pulsating vacuum system 101. The sealing component 6 is used to be laid on the soil surface 4 of the soft soil 2 foundation to be reinforced to isolate the soft soil 2 foundation from the atmosphere. The sealing component 6 can be a film or other sealing components that can isolate air, for example, airtight cloth or airtight plastic and other sealing components.

[0037] Each horizontal filter tube 5 is laid on the soil surface 4 of the soft soil 2 foundation and is located below the sealing assembly 6. One end of the horizontal filter tube 5 passes through the sealing assembly 6 and is connected to the main pipeline 7 located outside the sealing assembly 6. Each horizontal filter tube 5 is connected to the same main pipeline 7. The main pipeline 7 is connected to the pulsating vacuum system 101. The pulsating vacuum system 101 is also located outside the sealing assembly 6. For example, it can be located on the soft soil 2 foundation to be reinforced, or it can be located outside the soft soil 2 foundation to be reinforced. The main pipeline 7 can be a plastic pipe or other pipes, for example, a pipe made of PVC pipe or a pipe made of cement.

[0038] In an optional embodiment, the horizontal filter tube 5 passes through the sealing assembly 6 horizontally.

[0039] In an optional embodiment, the horizontal filter tubes 5 are arranged in parallel and at intervals, and the horizontal filter tubes 5 are distributed along the lateral or longitudinal extension of the soft soil 2 foundation.

[0040] Each horizontal filter tube 5 is connected to a plurality of drain boards 3, and the drain boards 3 are vertically arranged along the depth direction of the soft soil 2 foundation, that is, the drain boards 3 and the horizontal filter tubes 5 are perpendicular to each other, and the drain boards 3 are arranged in parallel and at intervals, and the lengths of the drain boards 3 are the same or different, that is, the burial depths buried in the soft soil 2 foundation are the same or different.

[0041] In an optional embodiment, an isolation component 1 is also included, and the isolation component 1 is used to seal and isolate the soft soil 2 foundation to be reinforced and the soft soil 2 foundation without reinforcement, so as to play a role in sealing the site. The isolation component 1 can be a plate such as a steel plate, or a wall formed by brick walling. For example, in Figure 2 In the figure, the soft soil 2 foundation on the left side of the isolation component 1 is the soft soil 2 foundation to be reinforced, and the soft soil 2 foundation on the right side of the isolation component 1 is the soft soil 2 foundation not to be reinforced.

[0042] The pulsating vacuum system 101 is used to extract air from the soft soil foundation 2 to be reinforced, so that a vacuum is formed in the soft soil foundation 2 to be reinforced within the coverage area of ​​the sealing assembly 6, and based on the vacuum degree in the soft soil foundation 2 to be reinforced, the air extraction power is adjusted so that the vacuum degree in the soft soil foundation 2 to be reinforced is maintained within a preset vacuum threshold range.

[0043] The pulsating vacuum system 101 includes a driving component 8, a gas-water separator 13, a first vacuum pump 14, a negative pressure accumulator 15, a second vacuum pump 21, a first electrically-controlled valve 12, a second electrically-controlled valve 16 and a control terminal 18. The first vacuum pump 14, the second vacuum pump 21, the first electrically-controlled valve 12 and the second electrically-controlled valve 16 are all electrically connected to the control terminal 18. The control terminal 18 is used to open and close the first vacuum pump 14, the second vacuum pump 21, the first electrically-controlled valve 12 and the second electrically-controlled valve 16.

[0044] The output end of the drive component 8 (i.e., the output end of the cylinder 11) is connected to the gas-water separator 13 through a first pipe (not shown in the figure). The drive component 8 is used to deliver and extract air into the gas-water separator 13 through the first pipe to increase or decrease the vacuum degree in the gas-water separator 13, thereby achieving the purpose of regulating the air in the gas-water separator 13.

[0045] The driving assembly 8 includes a motor 20, a crankshaft 9, a push rod 9 and a cylinder 11. The cylinder 11 includes a piston 10 and a piston cavity. The piston 10 is located in the piston cavity. The motor rotor (i.e., the output end) of the motor 20 is connected to one end of the crankshaft 9, and the other end of the crankshaft 9 is rotationally connected to one end of the push rod 9. The other end of the push rod 9 is rotationally connected to the piston 10. The motor rotor of the motor 20 rotates clockwise or counterclockwise to drive the crankshaft 9 to rotate along the crankshaft movement direction 23. During the rotation process of the crankshaft 9, the push rod 9 is synchronously driven to perform a composite motion including left and right movement and up and down swinging. During the composite motion process, the push rod 9 synchronously drives the piston 10 to reciprocate back and forth along the piston cavity period.

[0046] Of course, the driving assembly 8 may also adopt other structures, such as realizing back and forth driving through a screw transmission structure, thereby pressing in or drawing out the air in the gas-water separator 13 , thereby adjusting the vacuum degree in the gas-water separator 13 .

[0047] refer to Figure 3 The motor rotor is connected to the end of the crank rod 9 that deviates from the center position. For the straight crank rod 9, the center position of the crank rod 9 is also the midpoint of the crank rod 9. During the counterclockwise rotation of the crank rod 9, the push rod 9 is driven to swing up and down and move left and right, so that the push rod 9 drives the piston 10 to move along the piston movement direction 23, and the piston movement direction 23 is parallel to the axial direction of the piston cavity.

[0048] The motor rotor can rotate in half a cycle, that is, half a circle (upper half cycle), and then rotate in the opposite direction half a circle (lower half cycle), so that the piston 10 can reciprocate to the left or right. Figure 3 The horizontal leftward direction of the middle arrow represents only one of the piston movement directions 23 .

[0049] The main pipeline 7 is connected to the gas-water separator 13 through a second pipeline (not shown in the figure), and the first electrically-controlled valve 12 is installed on the second pipeline. The first electrically-controlled valve 12 is used to open and close the second pipeline, that is, to open the second pipeline so that the second pipeline is unobstructed, and the main pipeline 7 and the gas-water separator 13 remain connected; to close the second pipeline so that the second pipeline is blocked, the main pipeline 7 and the gas-water separator 13 remain separated, and the water in the main pipeline 7 cannot flow into the gas-water separator 13.

[0050] In an optional embodiment, a first pressure gauge 17 is further installed on the gas-water separator 13 . The first pressure gauge 17 is a digital vacuum pressure gauge. The first pressure gauge 17 can detect and display the current vacuum degree in the gas-water separator 13 in real time.

[0051] The first vacuum pump 14 is connected to the gas-water separator 13, and the first vacuum pump 14 can be connected to the gas-water separator 13 through a pipeline. The gas-water separator 13 and the first vacuum pump 14 are both connected to the negative pressure accumulator 15 through a third pipeline (not shown in the figure), and the negative pressure accumulator 15 is connected to the second vacuum pump 21 through a pipeline.

[0052] In an optional embodiment, the third pipeline is also installed with a second electrically controlled valve 16 and a second pressure gauge 22. The second pressure gauge 22 is a digital vacuum pressure gauge, which can detect and display the current vacuum degree in the third pipeline in real time, and the vacuum degree also represents the vacuum degree in the negative pressure accumulator 15. The second electrically controlled valve 16 is used to open and close the third pipeline to make the third pipeline unobstructed or blocked.

[0053] The vacuum pump can extract the air in the negative pressure accumulator 15 , so as to adjust the vacuum degree in the negative pressure accumulator 15 .

[0054] refer to Figure 1 and Figure 6 The pulsating vacuum reinforcement device for soft soil foundation and the reinforcement method thereof include the following steps:

[0055] Step 1: clean up the debris on the soft soil 2 foundation to be reinforced, and level the soil surface 4 of the soft soil 2 foundation to be reinforced;

[0056] Step 2: Determine the initial volume V0 in the vacuum preloading pipeline. The initial volume V0 is also the space in the vacuum preloading pipeline. The preloading pipeline represents the path through which the air extracted from the soft soil 2 foundation used to form a vacuum flows. The preloading pipeline includes a drain plate 3, a horizontal filter tube 5, a main pipeline 7, and an air-water separator 13. Therefore, the initial volume V0 is also the total volume of the drain plate 3, the horizontal filter tube 5, the main pipeline 7, and the air-water separator 13. Specifically, the initial volume V0 is calculated according to formula ①:

[0057] V0=l1·S1+l2·S2+V 气 +l3·S3------①

[0058] Wherein, l1 represents the total length of all drain plates 3. When the lengths of the drain plates 3 are the same, l1 is the product of the total number of drain plates 3 and the length of the drain plates 3. S1 is the water-passing cross-sectional area of ​​the drain plates 3. The water-passing cross-sectional areas of the drain plates 3 are the same. l2 represents the total length of all horizontal filter tubes 5. When the lengths of the horizontal filter tubes 5 are the same, l2 is the product of the total number of horizontal filter tubes 5 and the length of the horizontal filter tubes 5. S2 is the water-passing cross-sectional area of ​​the horizontal filter tubes 5. The water-passing cross-sectional areas of the horizontal filter tubes 5 are the same. V 气 It represents the cavity volume of the gas-water separator 13 for accommodating gas and / or liquid, which is approximately equal to the volume of the gas-water separator 13 , l3 represents the length of the main pipeline 7 , and S3 represents the water-passing cross-sectional area of ​​the main pipeline 7 .

[0059] Step 3: Based on the initial volume V0, calculate the volume change ΔV of the vacuum preloading pipeline according to formula ②:

[0060]

[0061] In the formula, p0 represents the initial gas pressure of the vacuum preload pipeline, that is, the gas pressure in the pipeline before the pressure is extracted. Δp represents the allowable vacuum pressure variation range in the process of extracting gas to change the vacuum degree, which is a preset constant value. V 气 ≥a·ΔV, a is a constant, usually a≥2, usually 3, that is, V 气 =3·ΔV, therefore, the piston 10 moves from the initial position to the right and compresses the air, which can compress ΔV, and moves to the left, which stretches ΔV, that is, the volume change of the piston 10 from the initial position to the right to the limit position under the action of the crankshaft 9 is ΔV, and the volume change from the initial position to the left to the limit position is also ΔV. ΔV can take positive or negative values, and a negative value indicates the volume change that needs to be reduced, and a positive value indicates the volume change that needs to be increased.

[0062] Step 4: Calculate the length r of the bent rod 9 according to formula ③, and calculate the speed n of the motor 20 according to formula ④:

[0063]

[0064]

[0065] In the formula, s′ represents the cross-sectional area of ​​the piston cavity of the cylinder 11, and ω represents the angular frequency.

[0066] Step 5: The control terminal 18 starts the first vacuum pump 14 and the second vacuum pump 21, closes the second electrically controlled valve 16, and opens the first electrically controlled valve 12, so that the vacuum degree in the negative pressure accumulator 15 begins to rise, and the vacuum degree in the soft soil foundation 2 to be reinforced also begins to rise. When the vacuum degree displayed by the second pressure gauge 22 reaches a preset value (for example, 90 kpa), the control terminal 18 turns off the second vacuum pump 21. After time t1, when the vacuum degree in the soft soil foundation 2 to be reinforced rises to p0, the motor 20 is started, and the motor rotor of the motor 20 drives the push rod 9 to perform circular motion, the push rod 9 drives the bent rod 9 to move, and the bent rod 9 drives the piston 10 to perform reciprocating motion. The vacuum in the pre-stressing pipeline of the pulsating vacuum system 101 begins to fluctuate periodically, and the soft soil foundation 2 to be reinforced begins to be fixed under the action of the vacuum pressure. The vacuum pressure of the soft soil foundation 2 to be reinforced changes as shown in FIG. Figure 6 As shown, T in the figure represents the period of vacuum fluctuation change.

[0067] When the sealing component 6 is found to be broken, the vacuum pressure in the soft soil 2 foundation begins to drop, and the vacuum pressure detected by the first pressure gauge 17 deviates from the preset vacuum pressure. The control terminal 18 opens the second electrically controlled valve 16, and the negative pressure accumulator 15 increases the vacuum degree in the air-water separator 13 by sucking air from the air-water separator 13 until it reaches the preset value, and then closes the second electrically controlled valve 16. The second vacuum pump 21 is simultaneously turned on until the second pressure gauge 22 detects that the vacuum pressure reaches the preset value of 90 kpa, and the control terminal 18 closes the second vacuum pump 21.

[0068] By controlling the opening and closing of the first vacuum pump 14, the second vacuum pump 21, the first electrically controlled valve 12 and the second electrically controlled valve 16, the gas enters the negative pressure accumulator 15 or flows back from the negative pressure accumulator 15 to the gas-water separator 13, and the vacuum degree in the gas-water separator 13 is continuously adjusted, thereby continuously adjusting the vacuum degree in the soft soil 2 foundation, thereby reinforcing the soft soil 2 foundation, until the soft soil 2 foundation settles to a preset elevation and the settlement speed meets the requirements of the specification, unloading detection and closing to form a vacuum operation, and completing the reinforcement of the soft soil 2 foundation.

[0069] The utility model can deliver pulsating vacuum pressure to the soft soil 2 foundation and realize automatic control and correction of the pulsating vacuum pressure, greatly reducing the operation frequency of opening and closing the vacuum pump, not only improving the vacuum preloading consolidation drainage rate and drainage speed, increasing the consolidation drainage volume, but also improving the permeability of the soft soil 2, improving the vacuum preloading reinforcement effect, and the reinforcement effect of the soft soil 2 is better.

[0070] The embodiment disclosed in this specification is only an example of the unilateral features of the utility model, and the protection scope of the utility model is not limited to this embodiment. Any other functionally equivalent embodiments fall within the protection scope of the utility model. For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the utility model.

Claims

1. A pulsating vacuum reinforcement device for soft soil foundation, characterized in that: It includes a sealing component, a plurality of drainage plates, a plurality of horizontal filter pipes, a main pipeline and a pulsating vacuum system. The sealing component is used to be laid on the soil surface of the soft soil foundation to be reinforced. Each horizontal filter tube is located below the sealing assembly. One end of the horizontal filter tube passes through the sealing assembly and is connected to the main pipeline outside the sealing assembly. The main pipeline is connected to the pulsating vacuum system. The horizontal filter tube is connected to the drainage board, which is vertically arranged along the depth direction of the soft soil foundation. The pulsating vacuum system is used to adjust the work power based on the vacuum degree in the soft soil foundation to be reinforced, so that the vacuum degree in the soft soil foundation to be reinforced fluctuates within a preset vacuum threshold range. The pulsating vacuum system includes a drive assembly, The driving assembly includes a motor, a crankshaft, a push rod and a cylinder. The cylinder includes a piston and a piston cavity. The piston is located in the piston cavity. The motor rotor of the motor is connected to one end of the crankshaft. The other end of the crankshaft is rotatably connected to one end of the push rod. The other end of the push rod is rotatably connected to the piston. The motor rotor is connected to the end of the crankshaft that is offset from the center position.

2. The pulsating vacuum reinforcement device for soft soil foundation according to claim 1, characterized in that: The horizontal filter tube passes horizontally through the sealing assembly.

3. The pulsating vacuum reinforcement device for soft soil foundation according to claim 2, characterized in that: The horizontal filter tubes are arranged in parallel and at intervals.

4. The pulsating vacuum reinforcement device for soft soil foundation according to claim 3, characterized in that: Each horizontal filter pipe is distributed along the lateral or longitudinal extension of the soft soil foundation.

5. The pulsating vacuum reinforcement device for soft soil foundation according to claim 4, characterized in that: The drain boards are arranged in parallel and at intervals, and the lengths of the drain boards are the same or different.

6. The pulsating vacuum reinforcement device for soft soil foundation according to claim 1, characterized in that: It also includes an isolation component, which is used for sealing and isolating the soft soil foundation to be reinforced and the soft soil foundation without reinforcement.

7. The pulsating vacuum reinforcement device for soft soil foundation according to claim 1, characterized in that: The pulsating vacuum system further includes a gas-water separator, a first vacuum pump, a negative pressure accumulator, a second vacuum pump, a first electrically controlled valve, a second electrically controlled valve and a control terminal. The first vacuum pump, the second vacuum pump, the first electrically controlled valve and the second electrically controlled valve are all electrically connected to the control terminal. The control terminal is used to open and close the first vacuum pump, the second vacuum pump, the first electrically controlled valve and the second electrically controlled valve. The output end of the driving component is connected to the air-water separator. The driving component is used to deliver and extract air in the air-water separator through the first pipeline to increase or decrease the vacuum degree in the air-water separator, so as to achieve the vacuum degree in the soft soil foundation to be reinforced to fluctuate within the preset vacuum threshold range. The main pipeline is connected to the gas-water separator, and the first electric control valve is installed on the path where the main pipeline is connected to the gas-water separator. The first vacuum pump is connected to the gas-water separator, the gas-water separator and the first vacuum pump are both connected to the negative pressure accumulator, and the second vacuum pump is connected to the negative pressure accumulator. The second electric control valve is installed on the path connecting the negative pressure accumulator with the first vacuum pump and the gas-water separator. The output end of the cylinder is communicated with the gas-water separator.

8. The pulsating vacuum reinforcement device for soft soil foundation according to claim 7, characterized in that: The output end of the cylinder is connected to the gas-water separator through the first pipeline, the main pipeline is connected to the gas-water separator through the second pipeline, the gas-water separator and the first vacuum pump are connected to the negative pressure accumulator through the third pipeline, the negative pressure accumulator is connected to the second vacuum pump through the pipeline, and the second electric control valve is on the third pipeline.

9. The pulsating vacuum reinforcement device for soft soil foundation according to claim 8, characterized in that: The gas-water separator is also equipped with a first pressure gauge which is a digital vacuum pressure gauge, and also includes a second pressure gauge which is installed on the third pipeline.

10. The pulsating vacuum reinforcement device for soft soil foundation according to claim 8, characterized in that: The crankshaft is in a straight line shape, and the motor shaft is connected to one end of the crankshaft that deviates from the midpoint.

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