Impermeable cast-in-place pile grouting device and grouting process

Abstract

The invention discloses an anti-seepage grouting device and technology for a cast-in-place pile, and particularly relates to the technical field of grouting of the cast-in-place pile, the device comprises a grouting machine and a slurry storage barrel, one end of a connecting pipe is provided with a grouting mechanism used for grouting, differential management of branch pipelines is achieved through the grouting mechanism and an intelligent pressure controller during grouting, and the grouting efficiency is improved. The grouting material can be effectively utilized, so that more slurry is saved, the slurry is diffused more uniformly, the continuity of an impervious layer is better, the slurry is directionally jetted due to compression expansion of the elastic microporous sleeve, the construction time of a single pile can be shortened through a directional jetting technology, the comprehensive manufacturing cost is reduced, and the process is divided into three grouting stages, so that the construction efficiency is improved. A main body impervious layer is formed through first-time grouting, shrinkage cracks are filled for the second time, pressure is maintained for the third time to ensure compactness, the shrinkage cracks are better eliminated through the three-time grouting technology, and the permeability coefficient of a pile-soil interface is reduced.

Description

Technical Field

[0001] This application relates to the field of grouting technology for cast-in-place piles, and more specifically, to a seepage-resistant grouting device and grouting process for cast-in-place piles. Background Technology

[0002] Cast-in-place piles, as a form of deep foundation, are widely used in various construction projects. After the traditional cast-in-place pile construction is completed, voids or cracks are easily formed between the pile body and the surrounding soil. Especially in water-rich strata, groundwater infiltration can lead to a decrease in the bearing capacity and durability of the pile foundation. In recent years, post-grouting technology has become the mainstream method to improve the performance of cast-in-place piles. By injecting cement grout into the pile side or pile end, voids are filled and the characteristics of the pile-soil contact surface are improved. Currently, the industry mainly uses two grouting methods: one is pile end pressure grouting, which injects grout at high pressure into the pile end through pre-embedded grouting pipes. Its advantage is that it can significantly improve end resistance; the other is pile side segmented grouting, which uses ring-distributed grouting pipes to achieve multi-point grouting, which can specifically reinforce weak soil layers.

[0003] However, the current grouting process still has the following problems in practical applications: 1. Fluctuations in grouting pressure lead to uneven grout diffusion, with excessive penetration in some areas and insufficient filling in others; 2. Conventional grout has a high shrinkage rate after solidification, which easily causes secondary cracks at the interface with the soil; 3. The grouting pipe layout is limited and cannot adapt to the different permeability requirements of different soil layers; 4. The construction process relies on manual experience and lacks a real-time monitoring and feedback adjustment mechanism.

[0004] Therefore, a seepage-resistant grouting device and grouting process for cast-in-place piles are proposed to address the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a seepage-resistant grouting device and grouting process for cast-in-place piles.

[0006] The grouting device and grouting process for a seepage-resistant cast-in-place pile provided in this application adopt the following technical solution:

[0007] A seepage-resistant cast-in-place pile grouting device includes a grouting machine and a grout storage tank. The grouting machine has a grout storage tank on its surface, and a grout inlet is provided inside the grout storage tank. A connecting pipe is provided on the inner wall of the grout inlet. The bottom of the grouting machine is provided with a moving mechanism to facilitate the movement of the device. The grouting machine has a stirring mechanism inside to prevent the grout from solidifying. One end of the connecting pipe is provided with a grouting mechanism for grouting.

[0008] Preferably, the moving mechanism includes a fixed frame, a first drive motor, a first connecting rod, a first bevel gear, a second bevel gear, a second connecting rod, and rollers. The fixed frame is fixedly connected to the bottom of one end of the grouting machine. The first drive motor is fixedly connected inside the fixed frame. The first connecting rod is fixedly connected to one end of the first drive motor. The first bevel gear is fixedly connected to one end of the first connecting rod.

[0009] Preferably, the surface of the first bevel gear is meshed with a second bevel gear, the inside of the fixed frame is rotatably connected to a second connecting rod, the second bevel gear is fixedly connected to the second connecting rod, and the surface of the second connecting rod is fixedly connected to two sets of rollers.

[0010] By adopting the above technical solution, when the grouting machine is pushed by the handle, the first drive motor is started, which drives the first bevel gear to rotate through the first connecting rod. When the first bevel gear rotates, it drives the second bevel gear to rotate. When the second bevel gear rotates, it drives the second connecting rod to rotate, so that the rollers fixed on both sides of the second connecting rod can rotate on the ground. This allows the grouting machine to move forward automatically, making it easier and more convenient for workers to push the grouting machine and move it to a suitable working position.

[0011] Preferably, the mixing mechanism includes a second drive motor, a first fixed rod, a first pulley, a belt, a second pulley, a second fixed rod, and a mixing rod. The second drive motor is fixedly connected inside the grouting machine. One end of the second drive motor is fixedly connected to the first fixed rod. One end of the first fixed rod is rotatably connected to the grouting machine. The surface of the first fixed rod is fixedly connected to the first pulley. The surface of the first pulley is provided with a belt. The inside of the belt is provided with a second pulley.

[0012] Preferably, a second fixed rod is rotatably connected inside the slurry storage tank, the second pulley is fixedly connected to the second fixed rod, a grouting machine is rotatably connected to one end of the second fixed rod, and multiple sets of stirring rods are fixedly connected to the surface of the second fixed rod.

[0013] By adopting the above technical solution, after the slurry is added to the storage tank, the second drive motor is started to drive the first pulley to rotate through the first fixed rod. The first pulley drives the second pulley to rotate through the belt, and then the second pulley drives the stirring rod to rotate through the second fixed rod. The rotation of the stirring rod prevents cement particles from settling and segregating, ensuring a constant water-cement ratio and consistent slurry performance.

[0014] Preferably, the grouting mechanism includes a grouting pump, a diverter, an intelligent pressure controller, a diverter pipe, an electromagnetic regulating valve, a PVC pipe, an elastic microporous sleeve, clamps, and spray holes. One end of the connecting pipe is equipped with a grouting pump, the surface of the grouting pump is equipped with a diverter, the top of the diverter is equipped with an intelligent pressure controller, the intelligent pressure controller is equipped with a pressure sensor inside, the surface of the diverter is equipped with multiple diverter pipes, and the surface of the multiple diverter pipes is equipped with electromagnetic regulating valves, which cooperate with the intelligent pressure controller.

[0015] By adopting the above technical solution, starting the grouting pump can draw the grout from the storage tank into the distributor through the grout inlet and connecting pipe, and then divide it into four branch pipelines through the distributor.

[0016] Preferably, the surfaces of the multiple sets of diversion pipes are fitted with PVC pipes, the surfaces of the PVC pipes are provided with elastic microporous sleeves, the PVC pipes and the elastic microporous sleeves form a composite grouting pipe, the surfaces of the multiple sets of diversion pipes are provided with clamps, the clamps cooperate with the composite grouting pipe, and one end of the PVC pipes and the elastic microporous sleeves is provided with a spray hole.

[0017] Preferably, the elastic microporous sleeve is composed of a composite of nitrile rubber and glass fiber braided layer.

[0018] Preferably, two sets of casters are rotatably connected to the bottom of one end of the grouting machine, and a handle is fixedly connected to the top of one end of the grouting machine.

[0019] Preferably, the grouting process includes the following steps:

[0020] Step 1: After drilling is completed, tie the four composite grouting pipes to the outside of the reinforcing cage, ensuring that the nozzles face the soil around the pile.

[0021] Step 2: 24 hours after pouring concrete, the grouting machine is moved to the vicinity of the cast-in-place pile using a moving mechanism, and the four composite grouting pipes are connected to the distributor on the grouting machine. The airtightness of the pipeline is tested using an intelligent pressure controller (test pressure 1.2 times the working pressure).

[0022] Step 3: Add the slurry to the storage tank and use the stirring mechanism to prevent the slurry from solidifying;

[0023] Step 4: When grouting is performed, the grouting pump is started to draw the grout from the storage tank into the distributor through the inlet and connecting pipe. The distributor then divides the grout into four branch pipelines. The intelligent pressure controller adjusts the flow rate of each branch according to the preset pressure curve (initial 0.5MPa, gradually increasing to 2MPa). When the grout passes through the nozzles on the composite grouting pipe, the elastic sleeve expands under pressure, causing the nozzles to form a directional jet, ensuring that the grout diffuses in a fan shape. When an abnormal increase in pressure is detected in a branch, the intelligent pressure controller controls the electromagnetic regulating valve to automatically reduce the flow rate of that branch and increase the grouting volume of other branches to compensate.

[0024] Step 5: Grout in three stages, from bottom to top. The first grouting volume is 40% of the design value to form the main impermeable layer. The second grouting (30%) is carried out after an interval of 6 hours to fill shrinkage gaps. The last 30% is used for the pressure maintenance stage to maintain pressure and ensure compactness, thereby better eliminating shrinkage cracks and reducing the permeability coefficient of the pile-soil interface.

[0025] Step 6: After grouting is completed, open the clamps, remove the composite grouting pipe, and then rinse the composite grouting pipe with clean water until clean water is drained to prevent the grout inside the pipe from solidifying and causing blockage.

[0026] The technical effects and advantages of this application are as follows:

[0027] Compared with existing technologies, this anti-seepage pile grouting device and grouting process, through the grouting mechanism, uses an intelligent pressure controller to achieve differentiated management of each branch pipeline during grouting, enabling effective utilization of grouting materials to save grout, while making the grout diffusion more uniform and the anti-seepage layer more continuous. The elastic microporous sleeve expands under pressure, causing the grout to be injected in a directional manner. The directional injection technology can shorten the construction time of a single pile and reduce the overall cost. The process is divided into three grouting stages: the first grouting forms the main anti-seepage layer, the second fills the shrinkage gaps, and the third maintains pressure to ensure compaction. Through the three-stage grouting process, shrinkage cracks are better eliminated, and the permeability coefficient of the pile-soil interface is reduced. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this application;

[0029] Figure 2 This is a schematic diagram of the structure of the moving mechanism in this application;

[0030] Figure 3 This is a schematic diagram of the stirring mechanism of this application;

[0031] Figure 4 This is a schematic diagram of the cooperation structure between the second pulley and the second fixed rod in this application;

[0032] Figure 5 This is a schematic diagram of the grouting mechanism of this application;

[0033] Figure 6 This is a schematic diagram of the grouting pump and flow divider structure of this application;

[0034] Figure 7 This is a schematic diagram of the PVC pipe and the elastic microporous sleeve used in this application.

[0035] The attached figures are labeled as follows: 1. Grouting machine; 2. Grout storage tank; 3. Grout inlet; 4. Connecting pipe; 5. Moving mechanism; 501. Fixed frame; 502. First drive motor; 503. First connecting rod; 504. First bevel gear; 505. Second bevel gear; 506. Second connecting rod; 507. Roller; 6. Mixing mechanism; 601. Second drive motor; 602. First fixed rod; 603. First pulley; 604. Belt; 605. Second pulley; 606. Second fixed rod; 607. Mixing rod; 7. Grouting mechanism; 701. Grouting pump; 702. Diverter; 703. Intelligent pressure controller; 704. Diverter pipe; 705. Electromagnetic regulating valve; 706. PVC pipe; 707. Elastic microporous sleeve; 708. Clamp; 709. Spray hole; 8. Universal wheel; 9. Handle. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Example 1

[0038] like Figures 1 to 7 The grouting device for anti-seepage cast-in-place piles shown includes a grouting machine 1 and a grout storage tank 2. The grouting machine 1 has a grout storage tank 2 on its surface for storing grout. The grout storage tank 2 has an inlet 3 inside. The inner wall of the inlet 3 is provided with a connecting pipe 4 so that the grout can be discharged into the connecting pipe 4 through the inlet 3. The bottom of the grouting machine 1 is provided with a moving mechanism 5 to facilitate the movement of the device, so as to make it easy to position one end of the grouting machine 1 in a suitable working position. The grouting machine 1 has a stirring mechanism 6 inside to prevent the grout from solidifying and affecting its use. One end of the connecting pipe 4 is provided with a grouting mechanism 7 for grouting.

[0039] In a preferred embodiment, the moving mechanism 5 includes a fixed frame 501, a first drive motor 502, a first connecting rod 503, a first bevel gear 504, a second bevel gear 505, a second connecting rod 506, and a roller 507. The fixed frame 501 is fixedly connected to the bottom of one end of the grouting machine 1. The first drive motor 502 is fixedly connected inside the fixed frame 501. The first connecting rod 503 is fixedly connected to one end of the first drive motor 502. The first bevel gear 504 is fixedly connected to one end of the first connecting rod 503. Starting the first drive motor 502 can drive the first bevel gear 504 to rotate through the first connecting rod 503.

[0040] In a preferred embodiment, the surface of the first bevel gear 504 is meshed with the second bevel gear 505, and the interior of the fixed frame 501 is rotatably connected to the second connecting rod 506. The second bevel gear 505 and the second connecting rod 506 are fixedly connected, and two sets of rollers 507 are fixedly connected to the surface of the second connecting rod 506. When the grouting machine 1 is pushed by the handle 9, the first drive motor 502 is started, which drives the first bevel gear 504 to rotate through the first connecting rod 503. When the first bevel gear 504 rotates, it drives the second bevel gear 505 to rotate. When the second bevel gear 505 rotates, it drives the second connecting rod 506 to rotate, so that the rollers 507 fixed on both sides of the second connecting rod 506 can rotate on the ground. This allows the grouting machine 1 to move forward automatically, making it easier and more convenient for the workers to push the grouting machine 1 and move it to a suitable working position.

[0041] In a preferred embodiment, the mixing mechanism 6 includes a second drive motor 601, a first fixed rod 602, a first pulley 603, a belt 604, a second pulley 605, a second fixed rod 606, and a mixing rod 607. The second drive motor 601 is fixedly connected inside the grouting machine 1. One end of the second drive motor 601 is fixedly connected to the first fixed rod 602. One end of the first fixed rod 602 is rotatably connected to the grouting machine 1. The first pulley 603 is fixedly connected to the surface of the first fixed rod 602. The surface of the first pulley 603 is provided with a belt 604. The second pulley 605 is provided inside the belt 604. When the second drive motor 601 is started, it can drive the first pulley 603 to rotate through the first fixed rod 602, so that the first pulley 603 can drive the second pulley 605 to rotate through the belt 604.

[0042] In a preferred embodiment, a second fixed rod 606 is rotatably connected inside the slurry storage tank 2. A second pulley 605 is fixedly connected to the second fixed rod 606. One end of the second fixed rod 606 is rotatably connected to the grouting machine 1. Multiple sets of stirring rods 607 are fixedly connected to the surface of the second fixed rod 606. When the slurry is added to the slurry storage tank 2, the second drive motor 601 is started to drive the first pulley 603 to rotate through the first fixed rod 602. The first pulley 603 drives the second pulley 605 to rotate through the belt 604. In turn, the second pulley 605 drives the stirring rods 607 to rotate through the second fixed rod 606. The rotation of the stirring rods 607 prevents cement particles from settling and segregating, ensuring a constant water-cement ratio and consistent slurry performance.

[0043] In a preferred embodiment, the grouting mechanism 7 includes a grouting pump 701, a distributor 702, an intelligent pressure controller 703, a distributor pipe 704, an electromagnetic regulating valve 705, a PVC pipe 706, an elastic microporous sleeve 707, a clamp 708, and a spray hole 709. One end of the connecting pipe 4 is equipped with the grouting pump 701, and the surface of the grouting pump 701 is equipped with the distributor 702. Starting the grouting pump 701 can draw the grout in the grout storage tank 2 into the distributor 702 through the grout inlet 3 and the connecting pipe 4, and then divide it through the distributor 702 to form four branch pipes. The top of the distributor 702 is equipped with the intelligent pressure controller 703, and the intelligent pressure controller 703 is equipped with a pressure sensor. The surface of the distributor 702 is equipped with a multi-component distributor pipe 704, and the surface of the multi-component distributor pipe 704 is equipped with an electromagnetic regulating valve 705. The electromagnetic regulating valve 705 cooperates with the intelligent pressure controller 703 to monitor the pressure of each branch pipe in real time and adjust it independently.

[0044] In a preferred embodiment, a PVC pipe 706 is sleeved on the surface of the multi-component flow pipe 704, and an elastic microporous sleeve 707 is provided on the surface of the PVC pipe 706. The PVC pipe 706 and the elastic microporous sleeve 707 form a composite grouting pipe. A clamp 708 is provided on the surface of the multi-component flow pipe 704. The clamp 708 cooperates with the composite grouting pipe to sleeve one end of the composite grouting pipe onto the flow pipe 704. The clamp 708 can fix the composite grouting pipe on the flow pipe 704. A spray hole 709 is opened at one end of the PVC pipe 706 and the elastic microporous sleeve 707.

[0045] As a preferred embodiment, the elastic microporous sleeve 707 is composed of a composite of nitrile rubber and glass fiber braided layer, making the elastic microporous sleeve 707 more durable.

[0046] In a preferred embodiment, two sets of casters 8 are rotatably connected to the bottom of one end of the grouting machine 1 for adjusting the direction of movement of the grouting machine 1, and a handle 9 is fixedly connected to the top of one end of the grouting machine 1 for pushing the grouting machine 1 through the handle 9.

[0047] As a preferred embodiment, the grouting process includes the following steps:

[0048] Step 1: After drilling is completed, tie the four composite grouting pipes to the outside of the steel cage, ensuring that the grouting hole 709 faces the soil around the pile.

[0049] Step 2: 24 hours after the concrete is poured, the grouting machine 1 is moved to the vicinity of the cast-in-place pile by the moving mechanism 5, and the four composite grouting pipes are connected to the distributor 702 on the grouting machine 1. The airtightness of the pipeline is tested by the intelligent pressure controller 703 at 1.2 times the working pressure.

[0050] Step 3: Add the slurry to the slurry storage tank 2, and use the stirring mechanism 6 to prevent the slurry from solidifying;

[0051] Step 4: When grouting is performed, the grouting pump 701 is started to pump the grout in the storage tank 2 into the distributor 702 through the grout inlet 3 and the connecting pipe 4. The distributor 702 then divides the grout into four branch pipelines. The intelligent pressure controller 703 adjusts the flow rate of each branch according to the preset pressure curve, starting at 0.5 MPa and gradually increasing to 2 MPa. When the grout passes through the nozzle 709 on the composite grouting pipe, the elastic sleeve expands under pressure, causing the nozzle 709 to form a directional jet, ensuring that the grout diffuses in a fan shape through the nozzle 709. When an abnormal increase in pressure is detected in a certain branch, the intelligent pressure controller 703 controls the electromagnetic regulating valve 705 to automatically reduce the flow rate of that branch and increase the grouting volume of other branches to compensate.

[0052] Step 5: Grout in three stages, from bottom to top. The first grouting volume is 40% of the design value, which forms the main impermeable layer. The second grouting volume of 30% is carried out after 6 hours to fill the shrinkage gaps. The last 30% is used for the pressure maintenance stage to maintain pressure and ensure compaction, thereby better eliminating shrinkage cracks and reducing the permeability coefficient of the pile-soil interface.

[0053] Step 6: After grouting is completed, open clamp 708, remove the composite grouting pipe, and then rinse the composite grouting pipe with clean water until clean water is drained to prevent the grout inside the pipe from solidifying and clogging.

[0054] The working process of this application is as follows: After drilling is completed, four composite grouting pipes are tied to the outside of the reinforcing cage, ensuring that the nozzle 709 faces the soil around the pile. 24 hours after concrete pouring, when the grouting machine 1 is pushed by the handle 9, the first drive motor 502 is started, which drives the first bevel gear 504 to rotate via the first connecting rod 503. When the first bevel gear 504 rotates, it drives the second bevel gear 505 to rotate. When the second bevel gear 505 rotates, it drives the second connecting rod 506 to rotate, allowing the rollers 507 fixed on both sides of the second connecting rod 506 to rotate on the ground. This allows the grouting machine 1 to move forward automatically, making it easier for workers to push the grouting machine 1. To facilitate the movement of the grouting machine 1 to the vicinity of the cast-in-place pile, one end of each of the four composite grouting pipes is fitted onto the distribution pipe 704. The composite grouting pipes are then fixed to the distribution pipe 704 using clamps 708. An airtightness test of the pipeline is performed using an intelligent pressure controller 703 at 1.2 times the working pressure. After adding the grout to the storage tank 2, the second drive motor 601 is started, driving the first pulley 603 via the first fixed rod 602. This causes the first pulley 603 to drive the second pulley 605 via the belt 604. The second pulley 605 then drives the stirring rod 607 via the second fixed rod 606. The rotation of the stirring rod 607 prevents cement from being stirred. Particle sedimentation and segregation ensure a constant water-cement ratio and consistent grout performance. During grouting, the grouting pump 701 is activated to pump the grout from the storage tank 2 into the distributor 702 through the inlet 3 and connecting pipe 4. The distributor 702 then divides the grout into four branch pipelines. The intelligent pressure controller 703 adjusts the flow rate of each branch according to the preset pressure curve, starting at 0.5 MPa and gradually increasing to 2 MPa. When the grout passes through the nozzles 709 on the composite grouting pipe, the elastic microporous sleeve 707 expands under pressure, causing the nozzles 709 to form a directional jet, ensuring that the grout diffuses in a fan shape through the nozzles 709. When an abnormal increase in pressure is detected in a branch, the intelligent pressure controller 703... The electromagnetic regulating valve 705 automatically reduces the flow rate of this branch and increases the grouting volume of other branches. Grouting is carried out in three stages, from bottom to top. The first grouting volume is 40% of the design value to form the main impermeable layer. The second grouting volume of 30% is carried out after an interval of 6 hours to fill the shrinkage gaps. The last 30% is used for the pressure maintenance stage to maintain pressure and ensure compaction, thereby better eliminating shrinkage cracks and reducing the permeability coefficient of the pile-soil interface. After grouting is completed, the clamp 708 is opened, the composite grouting pipe is removed, and the composite grouting pipe is rinsed with clean water until clean water is discharged to prevent the grout inside the pipe from solidifying and clogging. The above is the working principle of this impermeable cast-in-place pile grouting device and grouting process.

Claims

1. A grouting device for impermeable cast-in-place piles, comprising a grouting machine (1) and a grout storage tank (2), wherein the grouting machine (1) is provided with the grout storage tank (2), and the grout storage tank (2) is provided with a grout inlet (3) inside, and a connecting pipe (4) is provided on the inner wall of the grout inlet (3), characterized in that: The bottom of the grouting machine (1) is provided with a moving mechanism (5) to facilitate the movement of the device. The inside of the grouting machine (1) is provided with a stirring mechanism (6) to prevent the grout from solidifying. One end of the connecting pipe (4) is provided with a grouting mechanism (7) for grouting.

2. The anti-seepage type grouting device for cast-in-place piles according to claim 1, characterized in that: The moving mechanism (5) includes a fixed frame (501), a first drive motor (502), a first connecting rod (503), a first bevel gear (504), a second bevel gear (505), a second connecting rod (506), and a roller (507). The fixed frame (501) is fixedly connected to the bottom of one end of the grouting machine (1). The first drive motor (502) is fixedly connected inside the fixed frame (501). The first connecting rod (503) is fixedly connected to one end of the first drive motor (502). The first bevel gear (504) is fixedly connected to one end of the first connecting rod (503).

3. The anti-seepage type cast-in-place pile grouting device according to claim 2, characterized in that: The surface of the first bevel gear (504) is meshed with the second bevel gear (505), and the inside of the fixed frame (501) is rotatably connected to the second connecting rod (506). The second bevel gear (505) is fixedly connected to the second connecting rod (506), and the surface of the second connecting rod (506) is fixedly connected with two sets of rollers (507).

4. The anti-seepage type cast-in-place pile grouting device according to claim 1, characterized in that: The stirring mechanism (6) includes a second drive motor (601), a first fixed rod (602), a first pulley (603), a belt (604), a second pulley (605), a second fixed rod (606), and a stirring rod (607). The second drive motor (601) is fixedly connected inside the grouting machine (1). One end of the second drive motor (601) is fixedly connected to the first fixed rod (602). One end of the first fixed rod (602) is rotatably connected to the grouting machine (1). The first pulley (603) is fixedly connected to the surface of the first fixed rod (602). The surface of the first pulley (603) is provided with a belt (604). The second pulley (605) is provided inside the belt (604).

5. The anti-seepage type cast-in-place pile grouting device according to claim 4, characterized in that: The slurry storage tank (2) is rotatably connected to a second fixed rod (606), the second pulley (605) is fixedly connected to the second fixed rod (606), one end of the second fixed rod (606) is rotatably connected to a grouting machine (1), and multiple sets of stirring rods (607) are fixedly connected to the surface of the second fixed rod (606).

6. The anti-seepage type cast-in-place pile grouting device according to claim 1, characterized in that: The grouting mechanism (7) includes a grouting pump (701), a diverter (702), an intelligent pressure controller (703), a diverter pipe (704), an electromagnetic regulating valve (705), a PVC pipe (706), an elastic microporous sleeve (707), a clamp (708), and a spray hole (709). One end of the connecting pipe (4) is provided with a grouting pump (701). The surface of the grouting pump (701) is provided with a diverter (702). The top of the diverter (702) is provided with an intelligent pressure controller (703). The intelligent pressure controller (703) is provided with a pressure sensor inside. The surface of the diverter (702) is provided with multiple diverter pipes (704). The surface of the multiple diverter pipes (704) is provided with an electromagnetic regulating valve (705). The electromagnetic regulating valve (705) cooperates with the intelligent pressure controller (703).

7. The anti-seepage type cast-in-place pile grouting device according to claim 6, characterized in that: A PVC pipe (706) is fitted onto the surface of the multiple sets of diversion pipes (704). An elastic microporous sleeve (707) is provided on the surface of the PVC pipe (706). The PVC pipe (706) and the elastic microporous sleeve (707) form a composite grouting pipe. A clamp (708) is provided on the surface of the multiple sets of diversion pipes (704). The clamp (708) cooperates with the composite grouting pipe. A spray hole (709) is opened at one end of the PVC pipe (706) and the elastic microporous sleeve (707).

8. The anti-seepage type cast-in-place pile grouting device according to claim 7, characterized in that: The elastic microporous sleeve (707) is composed of a composite of nitrile rubber and glass fiber braided layer.

9. The anti-seepage type cast-in-place pile grouting device according to claim 1, characterized in that: Two sets of casters (8) are rotatably connected to the bottom of one end of the grouting machine (1), and a handle (9) is fixedly connected to the top of one end of the grouting machine (1).

10. A grouting process for impermeable cast-in-place piles, employing the grouting device for impermeable cast-in-place piles as described in any one of claims 1-9, characterized in that: The grouting process includes the following steps: Step 1: After drilling is completed, tie the four composite grouting pipes to the outside of the steel cage to ensure that the nozzle (709) faces the soil around the pile. Step 2: 24 hours after pouring concrete, the grouting machine (1) is moved to the vicinity of the cast-in-place pile by the moving mechanism (5), and the four composite grouting pipes are connected to the distributor (702) on the grouting machine (1). The air tightness of the pipeline is tested by the intelligent pressure controller (703). Step 3: Add the slurry to the slurry storage tank (2) and use the stirring mechanism (6) to prevent the slurry from solidifying; Step 4: When grouting is performed, the grouting pump (701) is started to pump the grout in the storage tank (2) into the distributor (702) through the grout inlet (3) and the connecting pipe (4), and the grout is divided by the distributor (702) to form four branch pipelines. The intelligent pressure controller (703) adjusts the flow rate of each branch according to the preset pressure curve. When the grout passes through the nozzle (709) on the composite grouting pipe, the elastic sleeve expands under pressure, so that the nozzle (709) forms a directional jet, ensuring that the grout diffuses in a fan shape through the nozzle (709). When the pressure of a certain branch is abnormally increased, the electromagnetic regulating valve (705) is controlled by the intelligent pressure controller (703) to automatically reduce the flow rate of that branch and increase the grouting volume of other branches to compensate. Step 5: Grout in three stages, from bottom to top. The first grouting volume is 40% of the design value, which forms the main impermeable layer. The second grouting volume of 30% is carried out after 6 hours to fill the shrinkage gaps. The last 30% is used for the pressure maintenance stage to maintain pressure and ensure compaction, thereby better eliminating shrinkage cracks and reducing the permeability coefficient of the pile-soil interface. Step 6: After grouting is completed, open the clamp (708), remove the composite grouting pipe, and then rinse the composite grouting pipe with clean water until clean water is discharged to prevent the grout inside the pipe from solidifying and blocking it.

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