Prestressed bag type anti-floating anchor end connecting structure

Abstract

The invention discloses a prestressed bag type anti-floating anchor rod end connecting structure which comprises a plurality of anchor rods, a track plate is placed between every two adjacent anchor rods, a connecting plate is arranged at the upper ends of the anchor rods, an inverted-circular-truncated-cone-shaped guide column is arranged at the valley bottom below the connecting plate, a plurality of ground nails are connected to the periphery of the connecting plate, and the ground nails are connected to the bottom of the connecting plate. The ground nail is fixed in a concrete base plate, the periphery of the guide column is sleeved with a buffer ring, and the anchor rod below the base plate is wrapped in a grouting column; compared with the prior art, effective tensioning and stabilizing of the base plate are achieved, when the base plate is subjected to buoyancy, movement of the buffer ring on the guide columns is converted into buffer force, the buffer force is transmitted to a deep stable soil layer through the anchor rod system, and therefore the floating trend of the base plate is effectively resisted.

Description

Technical Field

[0001] The invention relates to the technical field of anti-floating anchor rods, in particular to a prestressed capsule type anti-floating anchor rod end connection structure. Background Art

[0002] As an important part of modern high-speed railway construction, ballastless track has been widely used around the world for its continuous, smooth, stable, durable and low maintenance characteristics. Compared with traditional ballasted track, ballastless track uses prefabricated track plates, concrete base plates and other components to achieve the integration and rigidity of the track structure, improve the geometric accuracy and driving stability of the track, and meet the needs of high-speed, high-density and long-distance cross-line transportation of high-speed railways. However, in areas with abundant groundwater, the soil under the base plate is subject to buoyancy, which may cause the base plate and the track structure above it to float, thereby affecting the geometric accuracy of the track and driving safety, which not only increases the difficulty and cost of maintaining the track structure, but may also have a serious impact on the normal operation of the high-speed railway.

[0003] In order to deal with the buoyancy problem of ballastless track base plates, a variety of anti-floating technologies have been adopted, most of which rely on increasing the weight of the base plate, setting up a drainage system or using chemical grouting to reduce or offset the buoyancy. However, these methods often have many shortcomings in practical applications:

[0004] Although simply increasing the weight of the base plate can resist buoyancy to a certain extent, it will increase the deadweight of the track structure; setting up a drainage system requires complex pipe network layout and regular maintenance, and it is difficult to completely eliminate the impact of groundwater on the base plate. Although chemical grouting can effectively resist buoyancy in the short term, the long-term effect is difficult to guarantee, and the grouting range is large and the cost is high.

[0005] In order to overcome the limitations of traditional anti-floating technology, a prestressed capsule anti-floating anchor rod end connection structure is needed. It can effectively tighten and stabilize the base plate. When the base plate is subjected to buoyancy, it is converted into a buffer force and transmitted to the deep stable soil layer through the anchor rod system, thereby effectively resisting the floating trend of the base plate. It is also necessary to prefabricate and modularize the structural components to simplify the construction process and reduce the construction difficulty and cost. Summary of the invention

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a prestressed capsule anti-floating anchor rod end connection structure, comprising a plurality of anchor rods, a track plate is placed between two adjacent anchor rods, a connecting plate is provided at the upper end of the anchor rod, and an inverted cone-shaped guide column is provided at the bottom of the valley below the connecting plate. A plurality of ground nails are connected around the connecting plate, and the ground nails are fixed to a concrete base plate. A buffer ring is provided around the guide column, and the anchor rod under the base plate is covered in a grouting column.

[0007] Further, as a preference, the upper end of the anchor rod passes through the top of the connecting plate, and the outer wall of the upper end of the anchor rod is threaded and connected with a nut.

[0008] Further, as a preference, a through hole is opened in the center of the connecting plate and the guide column, a telescopic sleeve is fixed in the through hole, and the bottom of the telescopic sleeve extends into the base plate.

[0009] Further, preferably, connecting rods are hinged on both sides of the connecting plate, and the middle part of the connecting rods is hinged to the end surface of the track plate.

[0010] Further, as a preference, the rails on the track plate are connected to the track plate via elastic rail buckles, and one end of the pressing link away from the connecting plate is fitted to the bottom of the rails.

[0011] Further, as a preference, a hoop is provided on the outer wall of the buffer ring, and two ends of the hoop are connected by tension bolts.

[0012] Furthermore, preferably, a water level monitoring sensor is provided below the anchor rod.

[0013] Furthermore, preferably, the anchor rod is a hollow rod penetrating from top to bottom.

[0014] Further, preferably, the buffer ring is made of an elastic metal composite material.

[0015] Furthermore, preferably, the anchor rod, the connecting plate and the guide column have anti-corrosion paint, and the surrounding area of ​​the telescopic sleeve is coated with a waterproof coating.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Highly efficient anti-floating capability: When the soil below the base plate generates buoyancy due to the rising groundwater level, the movement of the buffer ring on the guide column is effectively converted into buffering force, which is transmitted to the deep stable soil layer through the anchor system, effectively resisting the floating trend of the base plate and track plate.

[0018] Dynamic adaptability: By adjusting the tightness of the nut and the hoop, the expansion degree of the buffer ring can be flexibly adjusted to adapt to different water level changes and buoyancy sizes, ensuring the stability of the structure under different working conditions.

[0019] Reset mechanism: The specially designed link structure allows the guide column to be reset when necessary through external operation or train load, ensuring long-term reliability and maintenance convenience of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a prestressed capsule type anti-floating anchor rod end connection structure;

[0021] Figure 2 A schematic diagram of the structure of

[0022] Figure 3 A schematic diagram of the structure of

[0023] In the figure: 1. anchor rod; 2. connecting plate; 3. guide column; 4. ground nail; 5. buffer ring; 6. grouting column; 7. base plate; 8. track plate; 9. nut; 10. telescopic sleeve; 11. connecting rod; 12. elastic buckle; 13. hoop. DETAILED DESCRIPTION

[0024] See also Figure 1 In an embodiment of the present invention, a prestressed capsule anti-floating anchor rod end connection structure includes multiple anchor rods 1, a track plate 8 is placed between two adjacent anchor rods 1, a connecting plate 2 is provided at the upper end of the anchor rod 1, and an inverted truncated cone-shaped guide column 3 is provided at the bottom of the valley below the connecting plate 2. Multiple ground nails 4 are connected around the connecting plate 2, and the ground nails 4 are fixed to a concrete base plate 7. A buffer ring 5 is sleeved around the guide column 3, and the anchor rod 1 under the base plate 7 is covered in a grouting column 6.

[0025] When the soil below the base plate 7 is affected by the upward buoyancy generated by the rising groundwater level, the buffer ring 5 moves toward the upper end of the guide column 3. Since the guide column 3 is fixed to the anchor rod 1 through the connecting plate 2, the guide column 3 does not move. The guide column 3 squeezes and expands the buffer ring 5, thereby generating a buffer force. The anchor rod 1 can pull the base plate 7 with a certain damping to resist floating.

[0026] See also Figure 2 In this embodiment, the upper end of the anchor rod 1 passes through the top of the connecting plate 2, and the outer wall of the upper end of the anchor rod 1 is threaded and connected with a nut 9. By turning the nut 9 to move the nut 9 downward, the anchor rod 1, the connecting plate 2, and the guide column 3 can be pressed against the base plate 7 through the buffer ring 5.

[0027] In this embodiment, a through hole is formed in the center of the connecting plate 2 and the guide column 3, and a telescopic sleeve 10 is fixed in the through hole, and the bottom of the telescopic sleeve 10 extends into the base plate 7. The telescopic sleeve 10 can improve the waterproof effect of the anchor rod 1 in the through hole, and prevent water accumulation in the through hole from causing rust in the stress section of the anchor rod 1.

[0028] In this embodiment, the connecting plate 2 is hinged with connecting rods 11 on both sides, and the middle part of the connecting rod 11 is hinged to the end surface of the track plate 8. By pressing the end of the connecting rod 11 away from the connecting plate 2, the guide column 3 can be moved upward to move away from the buffer ring 5, so that the guide column 3 is reset.

[0029] In this embodiment, the rails on the track plate 8 are connected to the track plate 8 through elastic rail buckles 12, and the end of the pressing link 11 away from the connecting plate 2 is attached to the bottom of the rails. When the train presses on the rails, the rails sink, thereby pressing the end of the connecting rod 11 away from the connecting plate 2.

[0030] In this embodiment, the outer wall of the buffer ring 5 is sleeved with a hoop 13, and the two ends of the hoop 13 are connected by a tension bolt. The hoop 13 can limit the expansion degree of the buffer ring 5 by adjusting the tightness of the tension bolt.

[0031] In this embodiment, a water level monitoring sensor is provided under the anchor rod 1 to monitor the change of underground water level in real time. When the water level approaches the preset warning line, an early warning signal is sent to the control center or maintenance personnel by wireless or wired means so that timely measures can be taken.

[0032] In this embodiment, the anchor rod 1 is a hollow rod that passes through from top to bottom. Drainage can be performed by connecting a water pump to the upper end of the anchor rod 1. Once the water level rises and reaches the drainage condition, the drainage pump is automatically started to drain the accumulated water, reducing the impact of buoyancy on the base plate.

[0033] In this embodiment, the elastic metal composite material of the buffer ring 5 can improve the stability and fatigue resistance of the buffer ring 5 in long-term use.

[0034] In this embodiment, the anchor rod 1, the connecting plate 2, and the guide column 3 are coated with anti-corrosion paint, and the surrounding area of ​​the telescopic sleeve 10 is coated with a waterproof coating, so as to extend the service life of the structure and reduce maintenance costs.

[0035] In specific implementation, the construction process of a prestressed capsule anti-floating anchor rod end connection structure for a ballastless track base plate includes:

[0036] According to the design drawings, determine the layout and quantity of the anchor rods 1, drill holes on the foundation according to the design positions, ensure that the drilling depth meets the anchoring requirements of the anchor rods 1, insert the prefabricated prestressed anchor rods 1 into the drilled holes, ensure that the lower end of the anchor rods 1 penetrates into the stable soil layer, and achieves the anchoring length required by the design;

[0037] Inject high-strength grouting material (such as cement slurry) around the anchor rod 1, and use the grouting pressure to fully fill the gap between the borehole and the anchor rod 1 to form a grouting column 6 to ensure that the anchor rod 1 is tightly combined with the surrounding soil;

[0038] A connecting plate 2 is installed on the upper end of the anchor rod 1, and an inverted frustum-shaped guide column 3 is fixed below the connecting plate 2;

[0039] Use a template to define the boundaries of the base plate 7, and ensure the flatness and stability of the template, pour the concrete material into the template, and ensure that the concrete is dense and free of bubbles by vibrating or other methods;

[0040] A plurality of ground nails 4 are driven around the connecting plate 2, and the ground nails 4 penetrate into the concrete base plate 7. The connecting plate 2 and the guide column 3 are further fixed to the base plate 7 through the ground nails 4, so as to improve the stability of the overall structure;

[0041] The buffer ring 5 is sleeved around the guide column 3, and the hoop 13 is installed. The hoop 13 is connected to the buffer ring 5 through a tightening bolt to adjust the expansion degree of the buffer ring 5;

[0042] A prefabricated track plate 8 is laid on the base plate 7 between the two anchor rods 1. The track plate 8 should be laid flat and tightly combined with the base plate 7. A special clamp or connector is used to fix the track plate 8 on the base plate 7 to ensure the stability and accuracy of the track plate 8.

[0043] The rails are installed on the track plate 8, and are firmly connected to the track plate 8 by elastic rail buckles 12. The elastic rail buckles 12 can ensure that the rails have a certain elasticity and shock absorption effect when the train passes;

[0044] Connecting rods 11 are hinged on both sides of the connecting plate 2, and the middle part of the connecting rod 11 is hinged to the end surface of the track plate 8. By pressing the end of the connecting rod 11 away from the connecting plate 2, the distance between the guide column 3 and the buffer ring 5 can be adjusted to achieve the reset operation of the guide column 3;

[0045] Anti-floating principle:

[0046] When the soil below the base plate 7 is subjected to the upward buoyancy generated by the rising groundwater level, the buoyancy is transmitted to the anchor rod 1 system through the base plate 7 and the track plate 8. At this time, the buffer ring 5 moves toward the upper end of the guide column 3 under the action of the buoyancy. Since the guide column 3 is firmly fixed in the anchor rod 1 through the connecting plate 2, its position remains unchanged. Therefore, when the buffer ring 5 moves upward, the guide column 3 will squeeze and expand it, generating a buffering force. This buffering force is transmitted to the underground stable soil layer through the connecting plate 2, the anchor rod 1 and the grouting column 6, forming an effective tension on the base plate 7 and the track plate 8;

[0047] The interaction between the guide column 3 and the buffer ring 5 not only provides a buffer force, but also produces a damping effect through friction and deformation between the materials, so that the anchor rod 1 can pull the base plate in a controlled manner to prevent it from floating up suddenly;

[0048] When the train passes, the rail sinks and pushes the guide column 3 upward through the elastic rail buckle 12 and the connecting rod 11, so that the buffer ring 5 temporarily releases pressure and moves upward. After the train passes, under the action of its own gravity and the elastic force of the buffer ring 5, the guide column 3 automatically returns to the initial position and waits for the next anti-floating action.

[0049] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A prestressed bladder type anti-floating anchor rod end connection structure, comprising a plurality of anchor rods (1), characterized in that: A track plate (8) is placed between two adjacent anchor rods (1), a connecting plate (2) is provided at the upper end of the anchor rod (1), a frustoconical guide column (3) is provided at the bottom of the valley below the connecting plate (2), a plurality of ground nails (4) are connected around the connecting plate (2), the ground nails (4) are fixed to a concrete base plate (7), a buffer ring (5) is provided around the guide column (3), and the anchor rod (1) under the base plate (7) is covered in a grouting column (6).

2. A prestressed bladder type anti-floating anchor rod end connection structure according to claim 1, characterized in that: The upper end of the anchor rod (1) passes through the top of the connecting plate (2); the outer wall of the upper end of the anchor rod (1) is threaded and connected to a nut (9).

3. A prestressed bladder type anti-floating anchor rod end connection structure according to claim 1, characterized in that: A through hole is provided at the center of the connecting plate (2) and the guide column (3), a telescopic sleeve (10) is fixed in the through hole, and the bottom of the telescopic sleeve (10) extends into the base plate (7).

4. A prestressed bladder type anti-floating anchor rod end connection structure according to claim 1, characterized in that: Connecting rods (11) are hinged on both sides of the connecting plate (2), and the middle part of the connecting rod (11) is hinged to the end surface of the track plate (8).

5. The prestressed capsule type anti-floating anchor rod end connection structure according to claim 1 is characterized in that: The steel rail on the track plate (8) is connected to the track plate (8) via an elastic rail buckle (12), and one end of the pressing link (11) away from the connecting plate (2) is attached to the bottom of the steel rail.

6. A prestressed capsule type anti-floating anchor rod end connection structure according to claim 1, characterized in that: The outer wall of the buffer ring (5) is sleeved with a hoop ring (13), and the two ends of the hoop ring (13) are connected by means of a loose bolt.

7. The prestressed capsule type anti-floating anchor rod end connection structure according to claim 1 is characterized in that: A water level monitoring sensor is provided below the anchor rod (1).

8. The prestressed capsule type anti-floating anchor rod end connection structure according to claim 1, characterized in that: The anchor rod (1) is a hollow rod that penetrates from top to bottom.

9. The prestressed capsule anti-floating anchor rod end connection structure according to claim 1, characterized in that: The buffer ring (5) is made of an elastic metal composite material.

10. The prestressed capsule anti-floating anchor rod end connection structure according to claim 1, characterized in that: The anchor rod (1), the connecting plate (2) and the guide column (3) are coated with anti-corrosion paint, and the surrounding area of ​​the telescopic sleeve (10) is coated with a waterproof coating.

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