Vacuum pump fixing device and method for vacuum surcharge preloading

Abstract

The invention discloses a vacuum pump fixing device and method for vacuum preloading, belongs to the technical field of pile foundation construction, and aims to solve the problems that in the prior art, due to the influence of uneven ground, a vacuum pump and an air exhaust pipeline are difficult to horizontally align, the vacuum pump often needs to be manually heightened and horizontally adjusted, the labor intensity is high, and the working efficiency is high. And construction is inconvenient. The vacuum pump fixing device for vacuum preloading comprises a base and a vacuum pump body, a pair of vertical arms are vertically fixed to the top of the base, and the pair of vertical arms are symmetrically distributed in the middles of the two sides of the base. According to the vacuum pump fixing device for vacuum preloading, lifting adjustment and horizontal sliding adjustment of the vacuum pump body are utilized, it can be ensured that the vacuum pump body can be smoothly connected with a vacuumizing pipeline under different working condition environments, and compared with a mode that the vacuum pump body is manually elevated or moved for adjustment in the traditional construction process, the vacuum pump fixing device has the advantages that the working efficiency is improved; the labor intensity is reduced, and operation and control are easier.

Description

Technical Field

[0001] The invention belongs to the technical field of pile foundation construction, and in particular relates to a vacuum pump fixing device and a fixing method for vacuum loading preloading. Background Art

[0002] Pile foundation vacuum preloading is a soft soil foundation treatment technology that combines vacuum preloading and preloading. Vacuum preloading is achieved by laying a sand cushion layer on the surface of the soft soil foundation that needs to be reinforced by the pile foundation, burying a vertical drainage pipe (such as a plastic drainage board), and then isolating it from the atmosphere with an airtight sealing membrane. Through the water absorption pipe buried in the sand cushion layer, a vacuum pump is used to evacuate air to form a vacuum environment, which reduces the pore water pressure in the foundation and increases the effective stress, thereby promoting drainage and consolidation of the foundation. Preloading preloading is to pile heavy objects (such as water, soil, sand, stone, etc.) on the foundation for preloading, so that the foundation completes most of the settlement during the preloading process and improves the strength of the foundation soil. Preloading preloading increases the load on the foundation, compresses the foundation soil, squeezes out the pore water, and gradually consolidates the foundation. The combination of vacuum preloading and pile loading preloading can significantly improve the bearing capacity and stability of the foundation and reduce the settlement of the foundation. However, in the actual construction process, it is found that during the vacuum preloading construction process, the vacuum pump and the related exhaust pipe need to be connected. Due to the uneven ground, the vacuum pump and the exhaust pipe are difficult to be horizontally aligned, and it is often necessary to manually raise and adjust the level of the vacuum pump, which results in high labor intensity and inconvenient construction. For this reason, the present invention proposes a vacuum pump fixing device and a fixing method for vacuum pile loading preloading. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a vacuum pump fixing device and a fixing method for vacuum loading preloading, aiming to solve the technical problems that under the prior art, due to the uneven ground, the vacuum pump and the exhaust pipe are difficult to be horizontally aligned, and manual raising and leveling of the vacuum pump are often required, resulting in high labor intensity and inconvenient construction.

[0004] Technical Solution

[0005] In order to solve the above technical problems, the present invention provides a vacuum pump fixing device for vacuum loading preloading, comprising a base and a vacuum pump body, a pair of vertical arms are vertically fixed on the top of the base, the pair of vertical arms are symmetrically distributed at the middle positions on both sides of the base, and a pair of vertical arms are horizontally equipped with supporting arms on the opposite sides, the supporting arms are distributed along the length direction of the base, and a pair of supporting arms are horizontally equipped with brackets, the vacuum pump body is mounted on the top of the bracket, and a lifting drive mechanism for driving the supporting arms to lift and lower is arranged on the vertical arms, and a horizontal drive mechanism for driving the bracket to translate along the length direction of the base is arranged on the supporting arms.

[0006] Preferably, the lifting drive mechanism includes a first sliding groove opened on the opposite sides of a pair of vertical arms, a first slider slidably embedded in the first sliding groove, and a first screw rod vertically rotatably installed in the first sliding groove, the first screw rod is threadedly engaged with the first slider, the support arm is fixedly connected to the first slider, and a first motor for driving the first screw rod to rotate is installed at the top of the vertical arm.

[0007] Preferably, the horizontal driving mechanism includes a second slide groove opened in the support arm, the second slide groove is distributed along the length direction of the support arm and passes through the upper surface of the support arm, a second slider is slidably embedded in the second slide groove, a second screw rod is rotatably installed in the second slide groove along the length direction, the second slider is threadedly engaged with the second screw rod, the bracket is fixedly connected to the second slider, and a second motor for driving the second screw rod to rotate is installed at the end of the support arm.

[0008] Preferably, a reinforcement plate is fixed between the side wall of the vertical arm and the upper surface of the base, and the reinforcement plate is arranged in a triangular structure.

[0009] Preferably, rollers are installed at the four corners of the bottom of the base, and positioning pieces for fixing the base on the ground are arranged at both ends of the base.

[0010] Preferably, the positioning member includes an extension arm fixed at the end of the base, an electric push rod vertically installed at the top of one end of the extension arm away from the base, and a positioning plate horizontally fixed at the telescopic end of the electric push rod, the positioning plate is located below the extension arm, and the telescopic end of the electric push rod passes through the extension arm and is connected to the positioning plate.

[0011] Preferably, a plurality of cone thorns are provided on the lower surface of the positioning plate.

[0012] Preferably, the upper surface of the second sliding block is flush with the upper surface of the supporting arm, and the lower surface of the bracket is slidably fitted with the upper surface of the supporting arm.

[0013] Preferably, the vacuum pump body is connected to the bracket by bolts, and the bracket is fixedly connected to the second sliding block by bolts.

[0014] A method for fixing a vacuum pump for vacuum preloading comprises the following steps:

[0015] Step 1: Foundation treatment: remove debris and water from the soft soil base surface at the pile foundation to ensure that the soft soil base surface is flat;

[0016] Step 2: burying drainage pipes, burying vertical drainage pipes in the soft soil base;

[0017] Step 3: Lay a sand cushion layer. Lay a sand cushion layer of a certain thickness on the surface of the soft soil base as a drainage and vacuum channel;

[0018] Step 4: burying the exhaust pipe, burying a horizontal and porous exhaust pipe in the sand cushion layer, with one end of the exhaust pipe extending out of the sand cushion layer;

[0019] Step 5: Lay a closed film. Lay an airtight closed film on top of the sand cushion layer to isolate the sand cushion layer and the soft soil base from the atmosphere;

[0020] Step 6: Pile up the backfill soil on top of the closed membrane for pre-compression, and determine the weight and distribution of the backfill soil according to the bearing capacity of the soft soil base and design requirements;

[0021] Step 7: Install the vacuum equipment, move the base to the end of the exhaust pipe extending out of the sand cushion layer, start the electric push rod to push the positioning plate downward, pierce the cone into the foundation to fix the base, start the first motor to drive the first screw to rotate, drive the support arm to lift the bracket to adjust the vacuum pump body, so that the vacuum pump body is horizontally aligned with the end of the exhaust pipe extending out of the sand cushion layer, start the second motor to drive the second screw to rotate, drive the second slider to slide along the second slide groove, drive the bracket and the vacuum pump body to adjust horizontally, so that the vacuum pump body is close to the end of the exhaust pipe extending out of the sand cushion layer and connected;

[0022] Step 8: Vacuuming: Start the vacuum pump to vacuum the sand cushion layer and the soft soil base layer under the sealing membrane to form a negative pressure environment to promote drainage and consolidation of the soft soil base layer;

[0023] Step 9: Monitoring and adjustment. During the construction process, the settlement, deformation and vacuum degree of the soft soil base are monitored in real time, and the construction parameters are adjusted in time according to the monitoring results.

[0024] Beneficial Effects

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention arranges rollers and positioning pieces, utilizes rollers to facilitate the transportation and movement of the vacuum pump body, starts an electric push rod to push the positioning plate downward, and pierces the cone into the foundation to quickly fix the base.

[0027] The present invention arranges a lifting drive mechanism and a horizontal drive mechanism. When the vacuum pump body is assembled for vacuum extraction, the first motor is started to drive the first screw to rotate, and the support arm is driven to lift the bracket to adjust the lifting of the vacuum pump body, so that the vacuum pump body and the end of the exhaust pipe extending outside the sand cushion layer are horizontally aligned. The second motor is started to drive the second screw to rotate, and the second slider is driven to slide along the second slide groove, so as to drive the bracket and the vacuum pump body to be horizontally modulated, so that the vacuum pump body can be close to the pipeline for docking. By utilizing the lifting and lowering adjustment and horizontal sliding modulation of the vacuum pump body, it can be ensured that the vacuum pump body can be smoothly connected to the vacuum extraction pipeline in different pile foundation construction environments. Compared with the method of manually raising or moving the vacuum pump body for adjustment in the traditional construction process, the labor intensity is reduced and it is easier to operate and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the base and the vertical arm in the present invention;

[0031] Figure 3 It is a structural schematic diagram of the bracket and the vacuum pump body in the present invention;

[0032] Figure 4 It is a structural schematic diagram of the support arm in the present invention;

[0033] Figure 5 It is a structural schematic diagram of the positioning member in the present invention;

[0034] Figure 6 It is a schematic diagram of the structure of the method of the present invention.

[0035] The markings in the accompanying drawings are: 1. base; 2. vertical arm; 3. bracket; 4. vacuum pump body; 5. roller; 6. positioning member; 7. first slide groove; 8. first screw rod; 9. first slider; 10. first motor; 11. supporting arm; 12. reinforcement plate; 13. second slide groove; 14. second motor; 15. second slider; 16. second screw rod; 17. extension arm; 18. electric push rod; 19. positioning plate; 20. cone thorn; 21. soft soil base layer; 22. sand cushion layer; 23. backfill; 24. sealing membrane; 25. drainage pipe; 26. exhaust pipe. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] This embodiment provides a vacuum pump fixing device for vacuum loading preloading, and its structural schematic diagram is as follows: Figure 1-Figure 5As shown, it includes a base 1 and a vacuum pump body 4, a pair of vertical arms 2 are vertically fixed on the top of the base 1, the pair of vertical arms 2 are symmetrically distributed at the middle positions on both sides of the base 1, and the opposite sides of the pair of vertical arms 2 are horizontally equipped with supporting arms 11, the supporting arms 11 are distributed along the length direction of the base 1, and the pair of supporting arms 11 are horizontally equipped with brackets 3, the vacuum pump body 4 is mounted on the top of the bracket 3, and a lifting drive mechanism for driving the supporting arms 11 to rise and fall is arranged on the vertical arms 2, and a horizontal driving mechanism for driving the bracket 3 to translate along the length direction of the base 1 is arranged on the supporting arms 11, wherein the lifting drive mechanism includes a first slide groove 7 opened on the opposite side of the pair of vertical arms 2, a first slider 9 slidably embedded in the first slide groove 7, and a first slider 9 vertically rotatably installed on the first slide groove 7. A first screw rod 8 in a slide groove 7, the first screw rod 8 is threadedly sleeved with the first slider 9, the support arm 11 is fixedly connected to the first slider 9, a first motor 10 for driving the first screw rod 8 to rotate is installed on the top of the vertical arm 2, the horizontal driving mechanism includes a second slide groove 13 opened in the support arm 11, the second slide groove 13 is distributed along the length direction of the support arm 11 and passes through the upper surface of the support arm 11, a second slider 15 is slidably embedded in the second slide groove 13, a second screw rod 16 is rotatably installed in the second slide groove 13 along the length direction, the second slider 15 is threadedly sleeved with the second screw rod 16, the bracket 3 is fixedly connected to the second slider 15, and a second motor 14 for driving the second screw rod 16 to rotate is installed at the end of the support arm 11.

[0038] Through the above-mentioned structural method, when the vacuum pump body 4 is assembled for vacuuming, the first motor 10 is started to drive the first screw 8 to rotate, and the supporting arm 11 is driven to lift the bracket 3 to adjust the lifting and lowering of the vacuum pump body 4, so that the vacuum pump body 4 and the end of the exhaust pipe 26 extending outside the sand cushion layer 22 are horizontally aligned, and the second motor 14 is started to drive the second screw 16 to rotate, and the second slider 15 is driven to slide along the second slide groove 13, so as to drive the bracket 3 and the vacuum pump body 4 to be horizontally modulated, so that the vacuum pump body 4 can be close to the pipeline for docking. By utilizing the lifting and lowering adjustment and horizontal sliding modulation of the vacuum pump body 4, it can be ensured that the vacuum pump body 4 can be smoothly connected to the vacuumized pipeline under different working conditions. Compared with the method of manually raising or moving the vacuum pump body 4 for adjustment in the traditional construction process, the labor intensity is reduced and it is easier to operate and control.

[0039] Furthermore, in the present embodiment, a reinforcement plate 12 is fixed between the side wall of the vertical arm 2 and the upper surface of the base 1 , and the reinforcement plate 12 is configured as a triangular structure for reinforcing the vertical arm 2 .

[0040] Furthermore, in this embodiment, rollers 5 are installed at the four corners of the bottom of the base 1, and positioning members 6 for fixing the base 1 on the ground are arranged at both ends of the base 1. The positioning members 6 include an extension arm 17 fixed to the end of the base 1, an electric push rod 18 vertically installed at the top of the end of the extension arm 17 away from the base 1, and a positioning plate 19 horizontally fixed to the telescopic end of the electric push rod 18. The positioning plate 19 is located below the extension arm 17, and the telescopic end of the electric push rod 18 penetrates the extension arm 17 and is connected to the positioning plate 19. A plurality of cone spikes 20 are arranged on the lower surface of the positioning plate 19. The rollers 5 can facilitate the transportation and movement of the vacuum pump body 4. The electric push rod 18 is started to push the positioning plate 19 downward, and the cone spikes 20 penetrate into the foundation to quickly fix the base 1.

[0041] Furthermore, in this embodiment, the upper surface of the second slider 15 is flush with the upper surface of the bracket arm 11, and the lower surface of the bracket 3 is slidably fitted with the upper surface of the bracket arm 11, and during the horizontal adjustment process of the bracket 3, the bracket arm 11 can provide support for the bracket 3. The vacuum pump body 4 is bolted to the bracket 3, and the bracket 3 is fixedly bolted to the second slider 15, which can facilitate the assembly of the vacuum pump body 4 and the bracket 3.

[0042] This embodiment also provides a method for fixing a vacuum pump for vacuum preloading. Figure 1-Figure 6 As shown, the following steps are included:

[0043] Step 1: Ground treatment, removing debris and water on the surface of the soft soil base 21 at the pile foundation to ensure that the surface of the soft soil base 21 is flat;

[0044] Step 2: burying the drainage pipe 25, burying the vertical drainage pipe 25 in the soft soil base 21;

[0045] Step 3: Laying a sand cushion layer 22: Laying a sand cushion layer 22 of a certain thickness on the surface of the soft soil base layer 21 as a drainage and vacuum channel;

[0046] Step 4: burying the air extraction pipe 26. A horizontal and porous air extraction pipe 26 is buried in the sand cushion layer 22, and one end of the air extraction pipe 26 extends out of the sand cushion layer 22;

[0047] Step 5: Laying a closed film 24, laying an airtight closed film 24 on the sand cushion layer 22, isolating the sand cushion layer 22 and the soft soil base layer 21 from the atmosphere;

[0048] Step 6: Pile up the backfill 23 on the sealing film 24 for pre-compression, and determine the weight and distribution of the backfill according to the bearing capacity of the soft soil base 21 and the design requirements;

[0049] Step 7: Install the vacuum equipment, move the base 1 to the end of the exhaust pipe 26 extending out of the sand cushion layer 22, start the electric push rod 18 to push the positioning plate 19 downward, and pierce the cone 20 into the foundation to fix the base 1, start the first motor 10 to drive the first screw 8 to rotate, drive the support arm 11 to lift the bracket 3 to adjust the vacuum pump body 4, so that the vacuum pump body 4 is horizontally aligned with the end of the exhaust pipe 26 extending out of the sand cushion layer 22, start the second motor 14 to drive the second screw 16 to rotate, drive the second slider 15 to slide along the second slide groove 13, drive the bracket 3 and the vacuum pump body 4 to adjust horizontally, so that the vacuum pump body 4 is close to the end of the exhaust pipe 26 extending out of the sand cushion layer 22 and connected;

[0050] Step 8: Vacuuming, starting the vacuum pump body 4, vacuuming the sand cushion layer 22 and the soft soil base layer 21 under the sealing film 24, forming a negative pressure environment, and promoting drainage and consolidation of the soft soil base layer 21;

[0051] Step nine: monitoring and adjustment. During the construction process, the settlement, deformation and vacuum degree of the soft soil base layer 21 are monitored in real time, and the construction parameters are adjusted in time according to the monitoring results.

[0052] All technical features in this embodiment can be freely combined according to actual needs.

[0053] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum pump fixing device for vacuum preloading, comprising a base (1) and a vacuum pump body (4), characterized in that: A pair of vertical arms (2) are vertically fixed on the top of the base (1), the pair of vertical arms (2) are symmetrically distributed at the middle positions of both sides of the base (1), and a support arm (11) is horizontally mounted on the opposite sides of the pair of vertical arms (2), the support arm (11) is distributed along the length direction of the base (1), a bracket (3) is horizontally mounted on the pair of support arms (11), the vacuum pump body (4) is mounted on the top of the bracket (3), a lifting drive mechanism for driving the support arm (11) to rise and fall is arranged on the vertical arm (2), and a horizontal drive mechanism for driving the bracket (3) to translate along the length direction of the base (1) is arranged on the support arm (11).

2. The vacuum pump fixing device for vacuum preloading according to claim 1 is characterized in that: The lifting drive mechanism comprises a first slide groove (7) provided on opposite sides of a pair of vertical arms (2), a first slider (9) slidably embedded in the first slide groove (7), and a first screw rod (8) vertically rotatably installed in the first slide groove (7), the first screw rod (8) and the first slider (9) are threadedly sleeved together, the support arm (11) is fixedly connected to the first slider (9), and a first motor (10) for driving the first screw rod (8) to rotate is installed at the top end of the vertical arm (2).

3. The vacuum pump fixing device for vacuum preloading according to claim 1, characterized in that: The horizontal driving mechanism comprises a second slide groove (13) provided in the supporting arm (11), the second slide groove (13) being distributed along the length direction of the supporting arm (11) and penetrating the upper surface of the supporting arm (11), a second slider (15) being slidably embedded in the second slide groove (13), a second screw rod (16) being rotatably installed in the second slide groove (13) along the length direction, the second slider (15) being threadedly sleeved with the second screw rod (16), the bracket (3) being fixedly connected with the second slider (15), and a second motor (14) for driving the second screw rod (16) to rotate is installed at the end of the supporting arm (11).

4. The vacuum pump fixing device for vacuum preloading according to claim 2 is characterized in that: A reinforcing plate (12) is fixed between the side wall of the vertical arm (2) and the upper surface of the base (1), and the reinforcing plate (12) is arranged in a triangular structure.

5. The vacuum pump fixing device for vacuum preloading according to claim 1, characterized in that: Rollers (5) are installed at the four corners of the bottom of the base (1), and positioning pieces (6) for fixing the base (1) on the ground are arranged at both ends of the base (1).

6. The vacuum pump fixing device for vacuum preloading according to claim 5, characterized in that: The positioning member (6) comprises an extension arm (17) fixed to the end of the base (1), an electric push rod (18) vertically mounted on the top of one end of the extension arm (17) away from the base (1), and a positioning plate (19) horizontally fixed to the telescopic end of the electric push rod (18), wherein the positioning plate (19) is located below the extension arm (17), and the telescopic end of the electric push rod (18) passes through the extension arm (17) and is connected to the positioning plate (19).

7. The vacuum pump fixing device for vacuum preloading according to claim 6, characterized in that: The lower surface of the positioning plate (19) is provided with a plurality of cone thorns (20).

8. The vacuum pump fixing device for vacuum preloading according to claim 3 is characterized in that: The upper surface of the second sliding block (15) is flush with the upper surface of the supporting arm (11), and the lower surface of the bracket (3) is slidably fitted with the upper surface of the supporting arm (11).

9. The vacuum pump fixing device for vacuum preloading according to claim 3, characterized in that: The vacuum pump body (4) is connected to the bracket (3) by bolts, and the bracket (3) is fixedly connected to the second sliding block (15) by bolts.

10. A method for fixing a vacuum pump for vacuum preloading, applied to a vacuum pump fixing device for vacuum preloading according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Ground treatment, removing debris and water on the surface of the soft soil base (21) at the pile foundation, and ensuring that the surface of the soft soil base (21) is flat; Step 2: burying a drainage pipe (25), burying a vertical drainage pipe (25) in the soft soil base (21); Step 3: Laying a sand cushion layer (22): Laying a sand cushion layer (22) of a certain thickness on the surface of the soft soil base layer (21) as a drainage and vacuum channel; Step 4: burying an air extraction pipeline (26), burying a horizontal and porous air extraction pipeline (26) in the sand cushion layer (22), with one end of the air extraction pipeline (26) extending out of the sand cushion layer (22); Step 5: Laying a closed film (24), laying an airtight closed film (24) on the sand cushion layer (22), isolating the sand cushion layer (22) and the soft soil base layer (21) from the atmosphere; Step 6: Pile up the backfill (23) on the sealing film (24) for pre-compression, and determine the weight and distribution of the backfill according to the bearing capacity of the soft soil base (21) and design requirements; Step 7: Install the vacuum equipment, move the base (1) to the end of the air extraction pipe (26) extending out of the sand cushion layer (22), start the electric push rod (18) to push the positioning plate (19) downward, and insert the cone (20) into the foundation to fix the base (1), start the first motor (10) to drive the first screw rod (8) to rotate, drive the support arm (11) to lift the bracket (3) to adjust the vacuum pump body (4) up and down, so that the vacuum pump body (4) and the end of the air extraction pipe (26) extending out of the sand cushion layer (22) are horizontally aligned, start the second motor (14) to drive the second screw rod (16) to rotate, drive the second slider (15) to slide along the second slide groove (13), drive the bracket (3) and the vacuum pump body (4) to adjust horizontally, so that the vacuum pump body (4) is close to the end of the air extraction pipe (26) extending out of the sand cushion layer (22) and connected; Step 8: vacuuming, starting the vacuum pump body (4), vacuuming the sand cushion layer (22) under the sealing film (24) and the soft soil base layer (21), forming a negative pressure environment, and promoting drainage and consolidation of the soft soil base layer (21); Step nine: monitoring and adjustment. During the construction process, the settlement, deformation and vacuum degree of the soft soil base (21) are monitored in real time, and the construction parameters are adjusted in time according to the monitoring results.

Images