Railway roadbed grouting reinforcement construction equipment and construction method
By designing the feed pipe and drill bit of the railway subgrade grouting reinforcement construction equipment, the problem of drill rod blockage was solved, enabling smooth cement delivery and effective reinforcement, and improving the practicality of the construction equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-10
- Publication Date
- 2026-04-10
AI Technical Summary
The drill rod ends of existing drilling and grouting equipment lack protection, which makes it easy for mud to enter the cement output channel, causing blockage and affecting cement output.
Design a railway subgrade grouting reinforcement construction equipment, which uses a feeding pipe and a drill bit. The feeding pipe is raised or lowered by a telescopic hydraulic cylinder, the drill bit rotates to drill holes, and the drill bit is vibrated by an eccentric rod to prevent mud from entering the feeding pipe and ensure smooth cement delivery.
This effectively prevents blockage of the feed pipe, ensures smooth cement entry into the borehole, and improves the practicality of the construction equipment and the reinforcement effect.
Smart Images
Figure CN121827151A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of railway construction technology, specifically to a railway subgrade grouting reinforcement construction equipment and construction method. Background Technology
[0002] In railway construction, the stability of the roadbed is crucial for the safe operation of the railway. The high frequency of use and heavy loads on railway lines can easily lead to damage. For example, heavy axle loads and high-density heavy-haul train loads can exacerbate track subsidence, frost heave, and other defects, seriously affecting traffic safety. The main method for treating track subsidence, frost heave, and other defects is to reinforce the existing railway roadbed through grouting.
[0003] Existing grouting reinforcement methods generally employ drilling grouting machines. These machines drill holes in the ground using drill rods and inject flowing cement into the holes, achieving integrated drilling and grouting. However, the drill rod ends of these drilling grouting machines lack protection for the cement output channels, allowing mud and other materials to easily enter during drilling, causing blockages and affecting cement output. Therefore, a railway subgrade grouting reinforcement construction equipment and method are proposed. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides a railway subgrade grouting reinforcement construction equipment and method to solve the problems in the background technology.
[0005] In a first aspect, to achieve the above objectives, the present invention provides the following technical solution: a railway subgrade grouting reinforcement construction equipment, comprising a frame, a lifting unit mounted on the frame, a lifting plate mounted on the lifting unit, a second motor and two telescopic cylinders mounted on the upper surface of the lifting plate, a transmission pipe fixedly mounted at the output end of the second motor, a vibration transmission rod mounted on the inner top wall of the transmission pipe, a drill bit fixedly mounted at the lower end of the vibration transmission rod, an adjusting ring fixedly mounted at the lower end of the telescopic cylinders, a feeding pipe rotatably connected to the adjusting ring and sliding on the outer wall of the transmission pipe, a feeding hole opened on the outer wall of the feeding pipe, a feeding unit for conveying materials into the feeding pipe through the feeding hole installed between the frame and the feeding pipe, a first toothed ring fixedly connected to the lower outer wall of the transmission pipe, a second toothed ring fixedly connected to the upper inner wall of the feeding pipe and meshing with the first toothed ring, and a limiting sleeve fixedly connected to the outer wall of the feeding pipe and slidingly connected to the outer wall of the vibration transmission rod.
[0006] Preferably, the vibration transmission rod includes an outer sleeve rod and a drive rod. The upper end of the drive rod is fixedly connected to the inner wall of the upper end of the transmission tube. The limiting sleeve slides on the outer wall of the outer sleeve rod. The drill bit is fixedly connected to the lower end of the outer sleeve rod. A rotating groove is opened at the lower end of the outer sleeve rod. An eccentric rod rotates in the rotating groove. The drive rod is rotatably connected inside the outer sleeve rod and fixedly connected to the upper end of the eccentric rod.
[0007] Preferably, the outer sleeve includes a first sleeve, a rubber sleeve, and a second sleeve that are fixedly connected in sequence. The drive rod includes a rigid shaft and a flexible shaft that are fixed to each other. The upper end of the drive rod is fixedly connected to the inner top wall of the transmission tube. The drive rod is rotatably connected inside the first sleeve. The flexible shaft is fixedly connected to the upper end of the eccentric rod and rotatably connected inside the rubber sleeve and the second sleeve. The first sleeve is slidably connected inside the limiting sleeve. The drill bit is fixedly connected to the lower end of the second sleeve. The rotary groove is formed inside the second sleeve.
[0008] Preferably, multiple metal wires are fixedly connected to the four corners of the upper end face of the second sleeve, and the other end of the metal wires passes through the first sleeve and wraps around to the upper surface of the limiting sleeve for fixed connection.
[0009] Preferably, multiple guide wheels are installed on the upper sidewall of the first sleeve, and the metal wire slides inside the guide wheels.
[0010] Preferably, a guide block is fixedly connected to the outer wall of the second sleeve, the guide block is fixedly connected to the upper end face of the drill bit, the outer wall of the guide block is provided with multiple guide limiting grooves, the lower end of the feeding pipe is provided with a sleeve groove that is movably sleeved on the outer wall of the guide block, and multiple limiting strips that match the guide limiting groove and are movably inserted are fixedly connected in the sleeve groove.
[0011] Preferably, the lifting unit includes a bracket fixedly installed on the frame and an auxiliary plate installed on the side wall of the frame. The lower end of the feeding pipe passes through the lifting plate. A stabilizing rod and a threaded rod are installed between the auxiliary plate and the frame. A first motor that drives the threaded rod to rotate is installed at the upper end of the bracket. The threaded rod is threadedly connected to the lifting plate, and the lifting plate is slidably connected to the outer wall of the stabilizing rod.
[0012] Preferably, the feeding unit includes a cement tank, a water tank, and a sleeve rotatably connected to the outer wall of the feeding pipe, which are mounted on the frame. The sleeve is fitted over multiple feed holes, and two feed pipes are fixedly connected to the outer wall of the feed holes. Both feed pipes pass through the lifting plate and are respectively connected to the cement tank and the water tank.
[0013] Secondly, a construction method for railway subgrade grouting reinforcement construction equipment, based on the railway subgrade grouting reinforcement construction equipment described in the first aspect, includes the following steps: The output end of the control telescopic cylinder descends, causing the feed pipe to abut against the upper end of the drill bit, so that the lower end of the feed pipe is blocked by the drill bit. The lifting unit controls the lowering of the lifting plate and starts the second motor, which drives the drill bit to rotate and drill holes. After drilling is completed, the output end of the telescopic cylinder is raised, which drives the feeding pipe to rise. At this time, the lower end of the feeding pipe is open. Cement is fed into the feed pipe through the feeding unit and then enters the borehole. The second motor drives the drive rod to rotate, which in turn drives the eccentric rod inside the outer sleeve to rotate, generating vibration. The rubber sleeve in the outer sleeve and the flexible shaft in the drive rod cause the drill bit to vibrate. The lifting unit controls the drill bit to rise while keeping it in the cement inside the borehole. The vibration of the drill bit removes the voids in the cement inside the borehole until the borehole is filled.
[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes the cooperation of a feeding pipe and a drill bit, employing a telescopic hydraulic cylinder to control the raising or lowering of the feeding pipe. During drilling, the feeding pipe is controlled to abut against the drill bit, thereby blocking the lower end of the feeding pipe. As the drill bit rotates and drills into the railway subgrade, the mud base material will not enter the feeding pipe, preventing blockage. Simultaneously, the feeding pipe is raised to open its lower end, allowing cement to be delivered from the feeding pipe into the borehole, thus improving practicality.
[0015] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the feed tube's state structure during drilling according to the present invention; Figure 3 This is a schematic diagram of the feeding pipe used in the present invention for conveying cement; Figure 4 This is a schematic cross-sectional view of the feed tube and transmission tube of the present invention in the drilling state. Figure 5 for Figure 4 A magnified view of a section at point A in the middle; Figure 6 This is a cross-sectional structural diagram of the feeding pipe and transmission pipe of the present invention when conveying cement. Figure 7 for Figure 6 A magnified view of a section at point B in the middle; Figure 8 This is a schematic diagram of the assembly structure of the feed pipe and the drill bit of the present invention; Figure 9 for Figure 8 A magnified view of a section at point C; Figure 10 This is a schematic diagram of the upper structure of the first sleeve of the present invention; Figure 11 for Figure 10 A magnified view of a section at point D; Figure 12 This is a cross-sectional structural diagram of the drive rod of the present invention.
[0017] In the diagram: 1. Frame; 2. Lifting plate; 3. Transmission pipe; 4. Feeding pipe; 5. Feeding unit; 51. Cement tank; 52. Water tank; 53. Housing; 54. Feeding pipe; 6. Lifting unit; 61. Support; 62. First motor; 63. Threaded rod; 64. Auxiliary plate; 65. Stabilizing rod; 7. Vibration transmission rod; 71. Outer sleeve; 711. First sleeve; 712. Rubber sleeve; 713. ... 72. Drive rod; 721. Hard shaft; 722. Flexible shaft; 73. Eccentric rod; 74. Rotary groove; 8. Drill bit; 9. Second motor; 10. Telescopic cylinder; 11. Adjusting ring; 12. Limiting sleeve; 13. First toothed ring; 14. Second toothed ring; 15. Feed hole; 16. Guide wheel; 17. Metal wire drawing; 18. Sleeve groove; 19. Limiting strip; 20. Guide block; 21. Guide limiting groove. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] Example 1: Please refer to the figure. A railway subgrade grouting reinforcement construction device of the present invention includes a frame 1, which is an integral support structure. A lifting unit 6 is installed on the frame 1, and a lifting plate 2 is installed on the lifting unit 6. The lifting unit 6 controls the lifting and lowering of the lifting plate 2. A second motor 9 and two telescopic cylinders 10 are installed on the upper surface of the lifting plate 2. The telescopic cylinders 10 can also be pneumatic telescopic rods, electric telescopic rods, etc. A transmission pipe 3 is fixedly installed at the output end of the second motor 9. The second motor 9 drives the transmission pipe 3 to rotate. A vibration transmission rod 7 is installed on the inner top wall of the transmission pipe 3. A drill bit 8 is fixedly installed at the lower end of the vibration transmission rod 7. An adjusting ring 11 is fixedly installed at the lower end of the telescopic cylinders 10. A feeding pipe 4 is rotatably connected inside the adjusting ring 11. The feeding pipe 4 slides on the outer wall of the transmission pipe 3 and abuts against one end of the drill bit 8. A feed hole 15 is opened on the outer wall of the feeding pipe 4. A feeding unit 5 for conveying materials into the feeding pipe 4 through the feed hole 15 is installed between the frame 1 and the feeding pipe 4. A first toothed ring 13 is fixedly connected to the lower outer wall of the transmission pipe 3. A second toothed ring 14 that meshes with the first toothed ring 13 is fixedly connected to the upper inner wall of the feeding pipe 4. A limiting sleeve 12 that slides on the outer wall of the vibration transmission rod 7 is fixedly connected to the outer wall of the feeding pipe 4. The contact position between the vibration transmission rod 7 and the limiting sleeve 12 is a rectangular structure. Therefore, the limiting sleeve 12 can limit the vibration transmission rod 7. Specifically, when reinforcing the railway subgrade, the telescopic cylinder 10 lowers its telescopic rod, which in turn causes the lower end of the feeding pipe 4 to contact the upper end of the drill bit 8 via the adjusting ring 11. The drill bit 8 blocks the lower end of the feeding pipe 4, and simultaneously the second toothed ring 14 on the inner wall of the feeding pipe 4 engages with the first toothed ring 13. At this time, the lifting unit 6 controls the lifting plate 2 to descend and starts the second motor 9. The second motor 9 drives the transmission pipe 3 to rotate, and the transmission pipe 3, through the first toothed ring 13 and the second toothed ring 14 engaged with it, drives the feeding pipe 4 to rotate. The feeding pipe 4, through its inner wall limiting sleeve 12, and simultaneously with the transmission pipe 3, drives the vibrating transmission rod 7 to rotate. The vibrating transmission rod 7 causes the drill bit 8 at its lower end to rotate, thereby drilling the railway subgrade. After drilling, the telescopic cylinder 10 is controlled to raise its telescopic rod, which in turn raises the feeding pipe 4. The second toothed ring 14 on the inner wall of the feeding pipe 4 separates from the first toothed ring 13. At this time, the lower end of the feeding pipe 4 separates from the upper end face of the drill bit 8, thus opening its lower end. Cement is then conveyed to the feeding pipe 4 through the feed hole 15 by the feeding unit 5 and conveyed to the drill hole from the lower end of the feeding pipe 4. As the cement in the drill hole gradually increases, the lifting unit 6 controls the lifting plate 2 to rise, which in turn raises the feeding pipe 4 and the drill bit 8 until the cement fills the drill hole. This ensures that the lower end of the feeding pipe 4 is closed when the drill bit 8 is drilling, thus preventing soil from entering the feeding pipe 4 and avoiding blockage. This ensures that the cement is smoothly discharged into the drill hole, improving practicality.
[0020] The vibration transmission rod 7 includes an outer sleeve rod 71 and a drive rod 72. The upper end of the drive rod 72 is fixedly connected to the inner wall of the upper end of the transmission pipe 3. The limiting sleeve 12 slides on the outer wall of the outer sleeve rod 71. The drill bit 8 is fixedly connected to the lower end of the outer sleeve rod 71. A rotating groove 74 is opened at the lower end of the outer sleeve rod 71. An eccentric rod 73 rotates in the rotating groove 74. The drive rod 72 is rotatably connected inside the outer sleeve rod 71 and fixedly connected to the upper end of the eccentric rod 73. Specifically, after drilling is completed, the feeding pipe 4 rises and abuts against the bottom surface of the lifting plate 2, thereby preventing the feeding pipe 4 from... Rotation will occur. The feeding pipe 4 restricts the outer sleeve 71 through its internal limiting sleeve 12 to prevent it from rotating. Cement enters the borehole from the lower end of the feeding pipe 4. At this time, the drill bit 8 is kept in the cement, and the second motor 9 continues to work. The second motor 9 drives the drive rod 72 to rotate. The drive rod 72 drives the eccentric rod 73 to rotate in the rotating groove 74. The vibration generated by the rotation of the eccentric rod 73 causes the drill bit 8 to vibrate the cement in the borehole, reducing the voids in the cement and improving the strength of the cement for the reinforcement of the railway subgrade.
[0021] The outer sleeve 71 includes a first sleeve 711, a rubber sleeve 712, and a second sleeve 713, which are fixedly connected in sequence. The first sleeve 711 and the second sleeve 713 are made of metal. The drive rod 72 includes a rigid shaft 721 and a flexible shaft 722 fixed to each other. The upper end of the drive rod 72 is fixedly connected to the inner top wall of the transmission tube 3 and rotatably connected within the first sleeve 711. The flexible shaft 722 is fixedly connected to the upper end of the eccentric rod 73 and rotatably connected within the rubber sleeve 712 and the second sleeve 713. The first sleeve 711 is slidably connected within the limiting sleeve 12. The first sleeve 711 has a rectangular structure. The drill bit 8 is fixedly connected to the lower end of the second sleeve 713. The rotating groove 74 is opened in the second sleeve 713. When it is necessary to vibrate the cement, the transmission tube 3 drives the rigid shaft 721 to rotate. The rigid shaft 721 drives the flexible shaft 722 to rotate. The flexible shaft 722 causes the eccentric rod 73 to rotate and generate vibration. The rubber sleeve 712, through its flexibility, makes the vibration effect of the second sleeve 713 and the drill bit 8 greater. And by utilizing the flexibility of the flexible shaft 722, it does not affect the fixation of the rigid shaft 721 and the transmission tube 3, further improving practicality.
[0022] Multiple metal wires 17 are fixedly connected to the four corners of the upper end face of the second sleeve 713. The other end of the metal wires 17 passes through the first sleeve 711 and is fixedly connected to the upper surface of the limiting sleeve 12. When the feeding pipe 4 descends, the limiting sleeve 12 pulls the metal wires 17 to tighten the second sleeve 713. At the same time, the feeding pipe 4 and the upper end face of the drill bit 8 abut against each other and exert force to ensure the stability of the second sleeve 713, so that the rubber sleeve 712 is not stressed and is not damaged. Similarly, when the feeding pipe 4 rises, the metal wires 17 are loosened, which does not affect the vibration effect of the drill bit 8 and further improves the practicality.
[0023] Multiple guide wheels 16 are installed on the upper side wall of the first sleeve 711. The metal wire 17 slides in the guide wheels 16, and the guide wheels 16 guide the metal wire 17, thereby reducing friction and improving service life.
[0024] A guide block 20 is fixedly connected to the outer wall of the second sleeve 713. The guide block 20 is fixedly connected to the upper end face of the drill bit 8. Multiple guide limiting grooves 21 are opened on the outer wall of the guide block 20. A sleeve groove 18 is opened at the lower end of the feeding pipe 4. The sleeve groove 18 is movably sleeved on the outer wall of the guide block 20. Multiple limiting strips 19 that match and are movably inserted into the guide limiting grooves 21 are fixedly connected inside the sleeve groove 18. When the feeding pipe 4 descends, the limiting strips 19 and the guide limiting grooves 21 guide the limiting strips 19 to the guide limiting grooves 21 to achieve the limiting effect. The strip 19 is inserted into the guide limiting groove 21. When the feeding pipe 4 rotates, the limiting strip 19, in conjunction with the guide limiting groove 21, can apply a rotational force to the guide block 20. This avoids the situation where only the limiting sleeve 12 applies force to the first sleeve 711 to make it rotate, while the second sleeve 713 is unable to apply force. Consequently, the drill bit 8 generates a large friction with the ground, which can easily cause the second sleeve 713 and the rubber sleeve 712 to twist or cause the metal wire 17 to break under stress, thus improving strength.
[0025] The lifting unit 6 includes a bracket 61 fixedly installed on the frame 1 and an auxiliary plate 64 installed on the side wall of the frame 1. The lower end of the feeding pipe 4 passes through the lifting plate 2. A stabilizing rod 65 and a threaded rod 63 are installed between the auxiliary plate 64 and the frame 1. A first motor 62 is installed at the upper end of the bracket 61 to drive the threaded rod 63 to rotate. The threaded rod 63 is threadedly connected to the lifting plate 2. The lifting plate 2 is slidably connected to the outer wall of the stabilizing rod 65. When the drill bit 8 drills into the foundation, the first motor 62 drives the threaded rod 63 to rotate, thereby causing the lifting plate 2 to descend and drive the drill bit 8 to drill into the ground. Of course, other methods such as hydraulics can also be used to control the lifting plate 2 to perform lifting operations, improving practicality. When the lifting plate 2 moves up and down, it drives the feeding pipe 4 to slide inside the lifting plate 2. The lifting plate 2 can provide limiting support force for the lower end of the feeding pipe 4, improving the strength of the feeding pipe 4.
[0026] The feeding unit 5 includes a cement tank 51, a water tank 52, and a casing 53 rotatably connected to the outer wall of the feeding pipe 4, all mounted on the frame 1. The cement tank 51 should be equipped with a stirring mechanism to ensure that the cement does not solidify. Both the cement tank 51 and the water tank 52 are equipped with pumps to extract the cement and water; however, these are not shown as they are common existing technology. The casing 53 is fitted over multiple feed holes 15. Two feed pipes 54 are fixedly connected to the outer wall of each feed hole 15. Both feed pipes 54 pass through the lifting plate 2 and are connected to the cement tank 51 and the water tank 52 respectively. The portion of the feed pipe 54 connecting to the lifting plate 2 and the casing 53 can be a rigid pipe, such as a plastic pipe or a metal pipe; the remaining portion can be a flexible hose. To accommodate the lifting of the lifting plate 2, the pumps in the cement tank 51 and water tank 52 respectively transport cement and water through the feed pipe 54 to the casing 53, and then into the feed pipe 4 through the feed hole 15. The cement is transported to fill the borehole and reinforce the railway subgrade. The water can flush the inside of the borehole to reduce mud and sand and improve the adhesion of the cement. At the same time, the water can flush the inside of the feed pipe 4 and the casing 53 to prevent cement residue from solidifying and affecting use. In order to prevent cement and water from flowing into each other, a one-way valve can be installed at the connection between the feed pipe 54 and the casing 53. The cement can only be transported into the casing 53 and cannot be transported from the casing 53 to the feed pipe 54. The one-way valve is a common existing technology, so it is not specifically shown.
[0027] Example 2: Based on Embodiment 1, this embodiment proposes a construction method for railway subgrade grouting reinforcement construction equipment.
[0028] According to the railway subgrade grouting reinforcement construction equipment described in Embodiment 1, the construction method includes the following steps: The output end of the telescopic cylinder 10 is lowered, causing the feeding pipe 4 to abut against the upper end face of the drill bit 8, so that the lower end of the feeding pipe 4 is blocked by the drill bit 8. The lifting unit 6 controls the lifting plate 2 to descend and starts the second motor 9 to work. The second motor 9 drives the drill bit 8 to rotate to drill a hole. After drilling is completed, the output end of the telescopic cylinder 10 is raised, which drives the feeding pipe 4 to rise. At this time, the lower end of the feeding pipe 4 is open. Cement is conveyed to the feeding pipe 4 through the feeding unit 5, and the cement enters the borehole. The second motor 9 causes the drive rod 72 to rotate, which in turn causes the eccentric rod 73 inside the outer sleeve rod 71 to rotate and generate vibration. The rubber sleeve 712 in the outer sleeve rod 71 and the flexible shaft 722 in the drive rod 72 cause the drill bit 8 to vibrate. The lifting unit 6 controls the drill bit 8 to rise while keeping it in the cement in the borehole. The vibration of the drill bit 8 removes the voids in the cement in the borehole until the borehole is filled.
Claims
1. A railway subgrade grouting reinforcement construction equipment, comprising a frame (1), characterized in that, A lifting unit (6) is installed on the frame (1), and a lifting plate (2) is installed on the lifting unit (6). A second motor (9) and two telescopic cylinders (10) are installed on the upper surface of the lifting plate (2). A transmission pipe (3) is fixedly installed at the output end of the second motor (9). A vibration transmission rod (7) is installed on the inner top wall of the transmission pipe (3). A drill bit (8) is fixedly installed at the lower end of the vibration transmission rod (7). An adjusting ring (11) is fixedly installed at the lower end of the telescopic cylinder (10). A sliding contact is rotatably connected inside the adjusting ring (11) to the transmission pipe (3). The outer wall of the feed pipe (4) is provided with a feed hole (15). A feeding unit (5) for conveying materials into the feed pipe (4) through the feed hole (15) is installed between the frame (1) and the feed pipe (4). A first toothed ring (13) is fixedly connected to the lower outer wall of the transmission pipe (3). A second toothed ring (14) that meshes with the first toothed ring (13) is fixedly connected to the upper inner wall of the feed pipe (4). A limiting sleeve (12) that slides on the outer wall of the vibration transmission rod (7) is fixedly connected to the outer wall of the feed pipe (4).
2. The railway subgrade grouting reinforcement construction equipment according to claim 1, characterized in that, The vibration transmission rod (7) includes an outer sleeve rod (71) and a drive rod (72). The upper end of the drive rod (72) is fixedly connected to the inner wall of the upper end of the transmission tube (3). The limiting sleeve (12) slides on the outer wall of the outer sleeve rod (71). The drill bit (8) is fixedly connected to the lower end of the outer sleeve rod (71). A rotating groove (74) is opened at the lower end of the outer sleeve rod (71). An eccentric rod (73) rotates in the rotating groove (74). The drive rod (72) is rotatably connected in the outer sleeve rod (71) and fixedly connected to the upper end of the eccentric rod (73).
3. The railway subgrade grouting reinforcement construction equipment according to claim 2, characterized in that, The outer sleeve (71) includes a first sleeve (711), a rubber sleeve (712), and a second sleeve (713) that are fixedly connected in sequence. The drive rod (72) includes a rigid shaft (721) and a flexible shaft (722) that are fixed to each other. The upper end of the drive rod (72) is fixedly connected to the inner top wall of the transmission tube (3). The drive rod (72) is rotatably connected inside the first sleeve (711). The flexible shaft (722) is fixedly connected to the upper end of the eccentric rod (73) and rotatably connected inside the rubber sleeve (712) and the second sleeve (713). The first sleeve (711) is slidably connected inside the limiting sleeve (12). The drill bit (8) is fixedly connected to the lower end of the second sleeve (713). The rotary groove (74) is opened inside the second sleeve (713).
4. The railway subgrade grouting reinforcement construction equipment according to claim 3, characterized in that, The upper end face of the second sleeve (713) is fixedly connected to multiple metal wires (17) at the four corners. The other end of the metal wires (17) passes through the first sleeve (711) and is fixedly connected to the upper surface of the limiting sleeve (12).
5. The railway subgrade grouting reinforcement construction equipment according to claim 4, characterized in that, Multiple guide wheels (16) are installed on the upper side wall of the first sleeve (711), and the metal wire (17) slides inside the guide wheels (16).
6. The railway subgrade grouting reinforcement construction equipment according to claim 1, characterized in that, The outer wall of the second sleeve (713) is fixedly connected to a guide block (20), the guide block (20) is fixedly connected to the upper end face of the drill bit (8), the outer wall of the guide block (20) is provided with multiple guide limiting grooves (21), the lower end of the feeding pipe (4) is provided with a sleeve groove (18) that is movably sleeved on the outer wall of the guide block (20), and multiple limiting strips (19) that match the guide limiting groove (21) and are movably inserted are fixedly connected in the sleeve groove (18).
7. The railway subgrade grouting reinforcement construction equipment according to claim 1, characterized in that, The lifting unit (6) includes a bracket (61) fixedly installed on the frame (1) and an auxiliary plate (64) installed on the side wall of the frame (1). The lower end of the feeding pipe (4) passes through the lifting plate (2). A stabilizing rod (65) and a threaded rod (63) are installed between the auxiliary plate (64) and the frame (1). A first motor (62) that drives the threaded rod (63) to rotate is installed at the upper end of the bracket (61). The threaded rod (63) is threadedly connected to the lifting plate (2). The lifting plate (2) is slidably connected to the outer wall of the stabilizing rod (65).
8. The railway subgrade grouting reinforcement construction equipment according to claim 1, characterized in that, The feeding unit (5) includes a cement box (51), a water box (52) and a sleeve (53) rotatably connected to the outer wall of the feeding pipe (4) on the frame (1). The sleeve (53) is fitted over multiple feed holes (15). Two feed pipes (54) are fixedly connected to the outer wall of the feed holes (15). Both feed pipes (54) pass through the lifting plate (2) and are respectively connected to the cement box (51) and the water box (52).
9. A construction method for railway subgrade grouting reinforcement equipment, characterized in that, The railway subgrade grouting reinforcement construction equipment according to claims 1-8, the construction method includes the following steps: The output end of the control telescopic cylinder (10) descends, causing the feeding pipe (4) to abut against the upper end of the drill bit (8), so that the lower end of the feeding pipe (4) is blocked by the drill bit (8); The lifting unit (6) controls the lifting plate (2) to descend and starts the second motor (9) to work. The second motor (9) drives the drill bit (8) to rotate to drill holes. After drilling is completed, the output end of the telescopic cylinder (10) is raised, which drives the feeding pipe (4) to rise. At this time, the lower end of the feeding pipe (4) is open. Cement is conveyed through the feeding unit (5) into the feeding pipe (4), and the cement enters the borehole; The second motor (9) causes the drive rod (72) to rotate, which in turn causes the eccentric rod (73) inside the outer sleeve rod (71) to rotate and generate vibration. The rubber sleeve (712) in the outer sleeve rod (71) and the flexible shaft (722) in the drive rod (72) cause the drill bit (8) to vibrate. The lifting unit (6) controls the drill bit (8) to rise while keeping it in the cement in the borehole. The vibration of the drill bit (8) removes the voids in the cement in the borehole until the borehole is filled.