Fill-dig interface roadbed geogrid reinforcing and fixing device

Abstract

The application relates to a filling-digging junction roadbed geogrid reinforcing fixing device and relates to the technical field of roadbed geogrid fixing. The device comprises a geogrid body, the side wall of the geogrid body is provided with a clamping sleeve, an anchor nail is slidably connected in the clamping sleeve, a pressing plate is fixedly connected to the side wall of the anchor nail, a reinforcing assembly is arranged in the anchor nail, and a fixing assembly is arranged in the clamping sleeve. The reinforcing assembly comprises a small spiral plate and a large spiral plate, the side walls of the small spiral plate and the large spiral plate are fixedly connected to the side wall of the anchor nail, and a conical head is fixedly connected to the bottom of the anchor nail. In the utility model, the screw rod rotation drives the slide rod to move downwards, and then the slide rod pushes the slide needle to extend and form three-stage anchoring with the small spiral plate and the large spiral plate, the anchoring area and the friction force between the anchor nail and the soil body are significantly increased, the pullout resistance of the anchor nail is greatly improved, and the overall stability of the geogrid in the filling-digging junction area is improved through the above structure.

Description

Technical Field

[0001] This utility model relates to the field of roadbed geogrid fixing technology, and in particular to a reinforced fixing device for roadbed geogrid at the cut-fill junction. Background Technology

[0002] In road construction, cut-fill junction sections are prone to uneven subgrade settlement and slope instability due to complex geological conditions and significant differences in soil properties, severely impacting road service life and traffic safety. Geogrids, as engineering materials with high tensile strength, are widely used in the reinforcement of cut-fill junction subgrades. Through friction with the soil and the restraining effect of reinforcement, they effectively improve the overall stability of the subgrade and reduce settlement deformation. However, in practical applications, geogrids require specific reinforcing and fixing devices to achieve a tight bond with the subgrade soil to fully realize their reinforcement effectiveness. Therefore, the design and optimization of geogrid reinforcing and fixing devices for cut-fill junction subgrades has become an important research direction in the field of road engineering. In existing technologies, the fixing of geogrids for cut-fill junction subgrades often employs a combination of anchor nail structures and lap joint structures. Anchor nail structures typically use straight-bar spiral steel anchor nails, with the rods mostly made of smooth steel bars or ordinary spiral steel bars, and a circular flat bearing plate welded to the top. During construction, the anchor nails are driven into the subgrade soil manually or using simple machinery, relying on the friction between the spiral structure and the soil to achieve anchoring. The bearing plate is directly pressed onto the surface of the geogrid, providing localized fixation. Lap joint structures mainly use nylon binding tape to fix the overlapping areas of adjacent geogrids at a single point, connecting the geogrids only through the tension of the binding tape to ensure the integrity of the geogrid. However, existing anchor structures rely solely on a single helical structure to contact the soil, resulting in a limited interlocking area and low frictional force during anchoring, leading to insufficient pull-out resistance. When the soil at the cut-fill junction is subjected to stress deformation or external loads, the anchors are prone to loosening or even being pulled out, causing the geogrid to loosen and fail to effectively reinforce and constrain the roadbed, thus affecting the stability of the cut-fill junction roadbed. Therefore, a geogrid reinforcement and fixing device for cut-fill junction roadbeds is proposed to address these issues. Utility Model Content

[0003] The purpose of this application is to provide a geogrid reinforcement and fixing device for cut-fill junction roadbeds, which aims to improve the problem of geogrid loosening due to insufficient anchoring force of anchors in the prior art.

[0004] The geogrid reinforcement and fixing device for the cut-fill junction roadbed provided in this application adopts the following technical solution: A geogrid reinforcement and fixing device for cut-fill junction roadbed includes a geogrid body, a sleeve provided on the side wall of the geogrid body, an anchor nail slidably connected inside the sleeve, a pressure plate fixedly connected to the side wall of the anchor nail, a reinforcement component provided inside the anchor nail, and a fixing component provided inside the sleeve. The reinforcement assembly includes a small spiral plate and a large spiral plate. The sidewalls of the small spiral plate and the large spiral plate are fixedly connected to the sidewall of the anchor. A cone head is fixedly connected to the bottom of the anchor. A screw is threaded inside the anchor. A handle is fixedly connected to the sidewall of the screw. A sliding rod is rotatably connected to the lower end of the screw. The sidewall of the sliding rod passes through one end of the cone head and is rotatably connected to multiple connecting plates. Multiple fixing sleeves are fixedly connected inside the cone head. A sliding spike is slidably connected inside each fixing sleeve. One end of each connecting plate is rotatably connected to the sidewall of the sliding spike.

[0005] By adopting the above technical solutions, the stability of geogrids can be improved.

[0006] Preferably, the fixing component includes a toothed plate, the sidewall of which is slidably connected to the inside of the sleeve, the sidewall of the geogrid body is slidably connected to the inside of the sleeve, and the sidewall of the toothed plate is attached to the sidewall of the geogrid body.

[0007] By adopting the above technical solution, the initial fixation of the splicing joints of the geogrid body can be achieved.

[0008] Preferably, a positioning plate is fixedly connected to the side wall of the slide rod, and the side wall of the positioning plate is slidably connected inside the cone head.

[0009] By adopting the above technical solution, the sliding rod can be positioned to avoid shaking.

[0010] Preferably, the sleeve has a positioning groove inside, and the side wall of the geogrid body is slidably connected inside the positioning groove.

[0011] By adopting the above technical solution, the location of the splicing point of the geogrid body can be achieved.

[0012] Preferably, a spring is provided inside the sleeve, one end of the spring is fixedly connected to the side wall of the toothed plate, and the other end of the spring is fixedly connected to a push plate.

[0013] By adopting the above technical solution, the toothed plate can be used to compress the geogrid body.

[0014] Preferably, the push plate sidewall is slidably connected inside the sleeve, the push plate sidewall is fixedly connected to a sliding plate, and the sliding plate sidewall is slidably connected inside the sleeve.

[0015] By adopting the above technical solution, the effect of moving the push plate can be achieved.

[0016] Preferably, the side wall of the ferrule is fixedly connected to a threaded post, and the side wall of the threaded post is slidably connected inside the sliding plate.

[0017] By adopting the above technical solution, the sliding plate can be slid, thereby driving the push plate to slide.

[0018] Preferably, the threaded column sidewall is threaded with a self-locking bolt, and the sidewall of the self-locking bolt is attached to the sidewall of the sliding plate.

[0019] By adopting the above technical solution, the position of the sliding plate can be locked.

[0020] 1. In this utility model, the screw rotation drives the sliding rod to move downward, thereby pushing the sliding spike to extend and form a three-stage anchorage with the small spiral plate and the large spiral plate. This significantly increases the interlocking area and friction between the anchor and the soil, thereby greatly improving the pull-out resistance of the anchor and solving the problem of the geogrid loosening due to insufficient anchoring force of existing anchors. The above structure improves the overall stability of the geogrid in the cut-fill interface area.

[0021] 2. In this utility model, the positioning groove of the sleeve wraps around the geogrid splice, and with the pressing of the toothed plate under the action of the spring and the fixing of the self-locking bolt, the splice is double fixed, thereby achieving the effect of uniform pressure distribution and effective transmission of tension, solving the problems of uneven force distribution and edge slippage at the existing overlap. The above structure improves the stability of the geogrid splice. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the geogrid reinforcement and fixing device for the cut-fill junction roadbed proposed in this utility model; Figure 2 This is a schematic diagram of the clamping sleeve of the geogrid reinforcement and fixing device for the cut-fill junction roadbed proposed in this utility model; Figure 3 This is a schematic diagram of the anchor nail structure of the geogrid reinforcement and fixing device for the cut-fill junction roadbed proposed in this utility model; Figure 4 This is a schematic diagram of the internal structure of the anchor nail of the geogrid reinforcement and fixing device for the cut-fill junction roadbed proposed in this utility model; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the bottom of the clamping sleeve of the geogrid reinforcement and fixing device for the cut-fill junction roadbed proposed in this utility model; Figure 7 This is a schematic diagram of the internal structure of the sleeve of the geogrid reinforcement and fixing device for the cut-fill junction roadbed proposed in this utility model; Explanation of reference numerals in the attached drawings: 1. Geogrid body; 2. Sleeve; 3. Anchor nail; 4. Pressure plate; 5. Small spiral plate; 6. Large spiral plate; 7. Screw; 8. Handle; 9. Cone head; 10. Sliding rod; 11. Positioning plate; 12. Fixing sleeve; 13. Sliding spike; 14. Connecting plate; 15. Positioning groove; 16. Toothed plate; 17. Spring; 18. Push plate; 19. Sliding plate; 20. Threaded column; 21. Self-locking bolt. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0024] Example 1: A geogrid reinforcement and fixing device for cut-fill junction roadbed, referring to Figures 1-5 The system includes a geogrid body 1, which enhances the integrity of the roadbed and distributes the load. The sidewall of the geogrid body 1 is provided with a sleeve 2, which is used to wrap the splicing parts of the geogrid body 1 and play a role in initially restraining the lateral displacement of the geogrid, thus preventing misalignment at the splicing point. Anchor nails 3 are slidably connected inside the sleeve 2. Anchor nails 3 are used to connect and fix the geogrid body 1 to the roadbed soil. They transmit the tensile force on the geogrid through their own interlocking with the soil. A pressure plate 4 is fixedly connected to the sidewall of the anchor nail 3. The pressure plate 4 is used to press against the surface of the geogrid body 1, increasing the contact area between the anchor nail 3 and the geogrid, preventing the anchor nail 3 from embedding into the geogrid and causing local tearing. Together with the sleeve 2, the geogrid is double-limited. The anchor nail 3 is provided with a reinforcing component, and the sleeve 2 is provided with a fixing component. The reinforcement components include a small spiral plate 5 and a large spiral plate 6. The sidewalls of both the small spiral plate 5 and the large spiral plate 6 are fixedly connected to the sidewalls of the anchor 3. The small spiral plate 5 is used to quickly spiral into the surface soil in the initial stage of anchor 3 driving, playing a role in initial positioning and providing basic friction force to prevent the anchor 3 from tilting when driving in. The large spiral plate 6 is used to contact the deep soil. Through the larger spiral diameter and contact area, it enhances the interlocking force between the anchor 3 and the soil and provides the main anchoring tensile force. Anchor nail 3 has a cone head 9 fixedly connected to its bottom. The cone head 9 reduces the resistance when the anchor nail 3 enters the soil, making it easier to drive the anchor nail 3 vertically into the deep soil layer. A screw rod 7 is threaded inside the anchor nail 3, which transmits rotational force. A handle 8 is fixedly connected to the side wall of the screw rod 7, allowing construction personnel to grip and apply rotational force, facilitating the rotation of the screw rod 7 and achieving labor-saving operation. A sliding rod 10 is rotatably connected to the lower end of the screw rod 7, converting the rotational motion of the screw rod 7 into linear motion. Multiple connecting plates 14 are rotatably connected to the side wall of the sliding rod 10, passing through one end of the cone head 9. The connecting plates 14 transmit the thrust of the sliding rod 10. The cone head 9 has a fixed internal connection... Multiple fixed sleeves 12 are connected, and each fixed sleeve 12 has a sliding spike 13 slidably connected inside. The sliding spike 13 is used to penetrate the surrounding soil after it extends, increasing the mechanical engagement point between the anchor 3 and the soil and improving the pull-out resistance. One end of each connecting plate 14 is rotatably connected to the side wall of the sliding spike 13. The side wall of the sliding rod 10 is fixedly connected to a positioning plate 11. The positioning plate 11 is used to limit the movement direction of the sliding rod 10 and prevent the sliding rod 10 from deviating or shaking during the sliding process. The side wall of the positioning plate 11 is slidably connected to the inside of the cone head 9 and cooperates with the inner wall of the cone head 9 to guide the sliding, ensuring that the sliding rod 10 moves vertically downward, achieving the effect of synchronous and stable extension of the sliding spike 13. Through the initial positioning of the small spiral plate 5, the basic anchoring force provided by the large spiral plate 6, and the graded synergistic effect of the sliding spike 13 to enhance the deep interlocking, the pull-out resistance of the anchor nail 3 is greatly improved, effectively preventing the geogrid body 1 from loosening due to insufficient anchoring.

[0025] Example 2: A geogrid reinforcement and fixing device for cut-fill junction roadbed, referring to... Figures 6-7The fixing component includes a toothed plate 16, which is made of high-strength alloy material. The toothed plate 16 is used to tightly fit the splice of the geogrid body 1 and embed into its mesh, enhancing the interlocking force with the geogrid and preventing relative slippage at the splice. The sidewall of the toothed plate 16 is slidably connected inside the sleeve 2, and the sidewall of the geogrid body 1 is slidably connected inside the sleeve 2. The sidewall of the toothed plate 16 is attached to the sidewall of the geogrid body 1. A positioning groove 15 is provided inside the sleeve 2 to accommodate the splice of the geogrid body 1, limiting the displacement of the geogrid perpendicular to the splicing direction and ensuring splice alignment. The sidewall of the geogrid body 1 is slidably connected inside the positioning groove 15. A spring 17 is provided inside the sleeve 2 to provide continuous elastic force, ensuring that the toothed plate 16 always presses tightly against the geogrid splice. One end of the spring 17 is fixedly connected to the toothed plate 16. A push plate 18 is fixedly connected to the other end of the spring 17 on the side wall. The push plate 18 is used to transmit external force to the spring 17, so that the spring 17 will compress and store elastic force. The side wall of the push plate 18 is slidably connected to the inside of the sleeve 2. A sliding plate 19 is fixedly connected to the side wall of the push plate 18. The sliding plate 19 is used to drive the push plate 18 to slide in the sleeve 2, thereby adjusting the compression of the spring 17. The side wall of the sliding plate 19 is slidably connected to the inside of the sleeve 2. A threaded post 20 is fixedly connected to the side wall of the sleeve 2. The side wall of the threaded post 20 is slidably connected to the inside of the sliding plate 19. A self-locking bolt 21 is threadedly connected to the side wall of the threaded post 20. The self-locking bolt 21 is used to lock the sliding plate 19. By engaging with the threaded post 20, the sliding plate 19 is fixed in the required position, thereby maintaining the preload of the spring 17. The side wall of the self-locking bolt 21 is attached to the side wall of the sliding plate 19. The positioning groove 15 is used to initially position the grid splice. The toothed plate 16 presses the grid tightly under the elastic force of the spring 17 and is embedded in the mesh. Then, through the transmission of the sliding plate 19 and the push plate 18 and the locking of the self-locking bolt 21, the dual fixing effect of elastic pressing and rigid constraint on the grid splice is achieved, so that the splice is evenly stressed and effectively prevents edge slippage.

[0026] Working principle: When using this equipment, first align the joints of the geogrid body 1 and embed it into the positioning groove 15 inside the sleeve 2, so that the joint edges are wrapped by the sleeve 2, initially restricting the relative slippage of the geogrid in the horizontal direction. Then, pass the anchor nail 3 through the reserved hole of the sleeve 2 and drive it vertically into the subgrade soil at the cut-fill junction. The small spiral plate 5 and the large spiral plate 6 on the side wall of the anchor nail 3 spiral into the soil during the driving process. The small spiral plate 5 quickly bites into the surface soil to achieve initial positioning, and the large spiral plate 6 forms friction with the deep soil through a larger contact area, providing basic anchoring force. The cone head 9 at the bottom reduces the resistance to soil penetration, ensuring that the anchor nail 3 sinks vertically to the preset depth.

[0027] After the anchor 3 is driven to the specified depth, the handle 8 at the top of the screw 7 is rotated, causing the screw 7 to advance downward along the internal thread of the anchor 3. The lower end of the screw 7 pushes the slide bar 10 to slide inside the cone head 9. At this time, the positioning plate 11 slides synchronously along the inner wall of the cone head 9 to ensure the stable advancement of the slide bar 10. When the slide bar 10 moves down, it pushes multiple sliding spikes 13 outward along the fixing sleeve 12 through the connecting plate 14. After the sliding spikes 13 break through the side wall of the cone head 9, they penetrate into the surrounding soil, forming a radial mechanical interlocking structure. The small spiral plate 5, the large spiral plate 6, and the sliding spikes 13 together constitute a three-level anchoring system, which greatly improves the pull-out resistance of the anchor 3 and the soil, and prevents the geogrid body 1 from loosening due to insufficient anchoring from the root.

[0028] Inside the sleeve 2, by pushing the sliding plate 19, the push plate 18 is driven to compress the spring 17, causing the toothed plate 16 to move closer to the splice of the geogrid body 1. The toothed structure of the toothed plate 16 is embedded in the geogrid mesh. The elasticity of the spring 17 ensures that the toothed plate 16 is always tightly attached to the geogrid surface, distributing the pressure evenly in the splice area. Tightening the self-locking bolt 21 on the threaded post 20 fixes the sliding plate 19. The preload of the spring 17 is continuously applied to the geogrid splice through the toothed plate 16. Combined with the positioning groove 15 of the sleeve 2, a double fixation of elastic compression and rigid constraint is formed. At this time, the tension of the geogrid body 1 is transmitted to the anchor nail 3 through the sleeve 2, and then dispersed into the soil by the spiral structure of the anchor nail 3 and the sliding spike 13, avoiding slippage or tearing at the splice due to concentrated force.

Claims

1. A geogrid reinforcement and fixing device for roadbed at the cut-fill junction, comprising a geogrid body (1), characterized in that: The geogrid body (1) has a sleeve (2) on its side wall, and an anchor (3) is slidably connected inside the sleeve (2). A pressure plate (4) is fixedly connected to the side wall of the anchor (3). A reinforcing component is provided inside the anchor (3), and a fixing component is provided inside the sleeve (2). The reinforcement assembly includes a small spiral plate (5) and a large spiral plate (6). The sidewalls of the small spiral plate (5) and the large spiral plate (6) are fixedly connected to the sidewall of the anchor (3). A cone head (9) is fixedly connected to the bottom of the anchor (3). A screw (7) is threaded inside the anchor (3). A handle (8) is fixedly connected to the sidewall of the screw (7). A sliding rod (10) is rotatably connected to the lower end of the screw (7). The sidewall of the sliding rod (10) passes through one end of the cone head (9) and is rotatably connected to multiple connecting plates (14). Multiple fixing sleeves (12) are fixedly connected inside the cone head (9). A sliding spike (13) is slidably connected inside each fixing sleeve (12). One end of each connecting plate (14) is rotatably connected to the sidewall of the sliding spike (13).

2. The geogrid reinforcement and fixing device for cut-fill junction roadbed according to claim 1, characterized in that: The fixing component includes a toothed plate (16), the side wall of which is slidably connected to the inside of the sleeve (2), the side wall of the geogrid body (1) is slidably connected to the inside of the sleeve (2), and the side wall of the toothed plate (16) is attached to the side wall of the geogrid body (1).

3. The geogrid reinforcement and fixing device for cut-fill junction roadbed according to claim 1, characterized in that: The slide bar (10) has a fixed connection to a positioning plate (11) on its side wall, and the side wall of the positioning plate (11) is slidably connected inside the cone head (9).

4. The geogrid reinforcement and fixing device for cut-fill junction roadbed according to claim 2, characterized in that: The sleeve (2) has a positioning groove (15) inside, and the side wall of the geogrid body (1) is slidably connected inside the positioning groove (15).

5. The geogrid reinforcement and fixing device for cut-fill junction roadbed according to claim 2, characterized in that: The sleeve (2) is provided with a spring (17) inside. One end of the spring (17) is fixedly connected to the side wall of the toothed plate (16), and the other end of the spring (17) is fixedly connected to a push plate (18).

6. The geogrid reinforcement and fixing device for cut-fill junction roadbed according to claim 5, characterized in that: The side wall of the push plate (18) is slidably connected to the inside of the sleeve (2), and the side wall of the push plate (18) is fixedly connected to the sliding plate (19), and the side wall of the sliding plate (19) is slidably connected to the inside of the sleeve (2).

7. The geogrid reinforcement and fixing device for cut-fill junction roadbed according to claim 6, characterized in that: The sleeve (2) has a threaded post (20) fixedly connected to its side wall, and the side wall of the threaded post (20) is slidably connected inside the sliding plate (19).

8. The geogrid reinforcement and fixing device for cut-fill junction roadbed according to claim 7, characterized in that: The threaded column (20) has a self-locking bolt (21) threadedly connected to its side wall, and the side wall of the self-locking bolt (21) is attached to the side wall of the sliding plate (19).

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