A frost heave prevention and filtration structure for drain holes in retaining walls

Abstract

The present invention discloses an anti-frost heave filter structure for a drain hole of a retaining wall in the technical field of retaining walls, comprising a contact baffle, an outer circular shell movably mounted on one side of the contact baffle, an upper partition circular shell movably mounted inside the outer circular shell, a lower partition circular shell arranged inside the upper partition circular shell, an inner circular shell arranged inside the lower partition circular shell, both the upper partition circular shell and the lower partition circular shell movably mounted on the contact baffle, the inner circular shell contact baffle is fixedly connected, a hump-type water guide pipe is fixedly mounted inside the inner circular shell, a fixed component is fixedly mounted on the side of the contact baffle away from the outer circular shell, the hump-type drainage increases the water inlet area and the water flow velocity, and combined with the anti-frost heave layer, reduces frost heave damage, and after the device is prefabricated elsewhere, it can be transported to the construction site for installation and use, is convenient for construction, and greatly improves on-site construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of retaining wall technology, specifically to a frost-resistant filter structure for drainage holes in retaining walls. Background Art

[0002] In autumn, as temperatures drop, the soil begins to freeze from the surface of the retaining wall, preventing water from draining away. As the freezing depth increases, moisture migrates towards the freezing front and accumulates, with pore ice and partial frost mainly concentrated in the 2 / 3 to 1 / 2 range of the maximum freezing depth. The increased volume of the frozen soil causes frost heave, leading to deformation and damage to the retaining wall. In spring, as the frozen layer thaws, water flows into contact with the soil, carrying soil particles away. At this time, a filter layer installed in the retaining wall prevents soil particles from flowing out, thus preventing soil erosion or slope instability. However, existing integrated retaining wall drainage hole filter structures, often square in shape, are prone to deformation and displacement under construction and earth pressure. During seasonal freeze-thaw cycles, the small inlet area, low water flow velocity, and lack of an anti-frost heave layer easily lead to blockage and frost heave near the drainage holes, resulting in severe water accumulation in the soil behind the wall, soil frost heave, and retaining wall instability. Summary of the Invention

[0003] The technical problem of this invention is to provide a frost-resistant filter structure for the drainage holes of retaining walls. In this invention, the hump-shaped drainage increases the water inlet area and water flow velocity. Combined with the frost-resistant layer, it reduces frost heave damage. Moreover, after being prefabricated elsewhere, it can be transported to the construction site for installation and use, which is convenient for construction and greatly improves on-site construction efficiency.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a frost-resistant filter structure for a retaining wall drainage hole, comprising a contact baffle, an outer circular shell movably mounted on one side of the contact baffle, an upper partition circular shell movably mounted inside the outer circular shell, a lower partition circular shell disposed inside the upper partition circular shell, and an inner circular shell disposed inside the lower partition circular shell. Both the upper and lower partition circular shells are movably mounted to the contact baffle. The inner circular shell is fixedly connected to the contact baffle. A hump-shaped water guide pipe is fixedly mounted inside the inner circular shell. One end of the hump-shaped water guide pipe is fixedly mounted on the contact baffle and a compressible frost-resistant layer is fixedly mounted thereon. A drainage pipe is fixedly mounted at the end of the compressible frost-resistant layer away from the hump-shaped water guide pipe. A fixing component is fixedly mounted on the side of the contact baffle away from the outer circular shell.

[0005] As a further embodiment of the present invention, the fixing component includes a mounting shaft, which is fixedly mounted on the contact baffle. A fixing rod is fixedly mounted on the outer surface of the mounting shaft. A filling cavity is provided between the fixing rod and the mounting shaft. A plurality of permeation holes are provided on the fixing rod. A mounting seat is rotatably mounted on the mounting shaft corresponding to the fixing rod and the contact baffle.

[0006] As a further embodiment of the present invention, the upper surface of the mounting base is provided with a snap-fit ​​groove, a limiting component is fixedly installed in the snap-fit ​​groove, an extension groove is provided between the mounting base and the filling cavity, a plurality of rotating rods are fixedly installed on the side of the mounting base near the fixing rod, a micro motor is fixedly installed in the contact baffle, and the output end of the micro motor is fixedly connected to the mounting base.

[0007] As a further embodiment of the present invention, a plurality of mounting grooves are provided on the side of the contact baffle near the outer circular outer shell, corresponding to the positions of the outer circular outer shell, the upper partition circular outer shell and the lower partition circular outer shell, and a limiting groove is provided on one side of the mounting groove.

[0008] As a further embodiment of the present invention, a plurality of guide members are fixedly installed on the outer circular shell, the upper partition circular shell, and the lower partition circular shell near the contact baffle. A snap-fit ​​block is fixedly installed on one end of the guide member near the contact baffle. The snap-fit ​​block matches the limiting groove. The inner side of the outer circular shell is attached to the outer side of the upper partition circular shell, the inner side of the upper partition circular shell is attached to the outer side of the lower partition circular shell, and the inner side of the lower partition circular shell is attached to the outer side of the inner circular shell.

[0009] As a further embodiment of the present invention, the outer circular shell, the upper partition circular shell, the lower partition circular shell, the inner circular shell, and the contact baffle are all provided with multiple water outlet holes. The outer circular shell and the upper partition circular shell are filled with a first type of crushed stone, the upper partition circular shell and the lower partition circular shell are filled with a second type of crushed stone, and the lower partition circular shell and the inner circular shell are filled with a third type of crushed stone. The particle size of the first, second, and third crushed stone gradually decreases.

[0010] As a further embodiment of the present invention, the upper surface of the hump-shaped water pipe is provided with multiple water inlet holes, the compressible anti-freezing layer is rectangular and vertically arranged at one end of the hump-shaped water pipe and the drain pipe, and the inner circular outer shell is provided with filler material.

[0011] As a further embodiment of the present invention, a retaining wall is provided on one side of the contact baffle, a fixing groove is provided on the retaining wall, the fixing groove matches the fixing rod, a drainage hole is provided on the retaining wall, and the drainage pipe is fixedly installed at the upper end of the drainage hole.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This invention is applicable to high-altitude permafrost regions. It utilizes a multi-layered hemispherical filter layer formed by an outer circular shell, an upper circular shell, a lower circular shell, and an inner circular shell. When water flows from the protected soil into the outer circular shell, most of the coarse soil particles are retained. Some fine soil particles are carried by the water into the first crushed stone layer. The fine soil particles carried by the water flow through the holes in the mesh-like structure into the second crushed stone layer. In the second crushed stone layer, most of the fine soil particles are retained on the surface of the gravel. Simultaneously, the water carries the remaining fine soil through the third crushed stone layer, which is composed of geotextile fabric. The remaining fine soil particles in the third layer of crushed stone adhere to the surface of the gravel, and the further the fine soil particles are, the less likely they are to be lost, thus protecting the soil and preventing soil erosion. Furthermore, by using a hump-shaped water pipe with an inlet at the top and wrapping it with permeable geotextile, the inlet area is increased, preventing the entry of fine soil particles. This also increases the height difference between the inlet and the drain pipe, effectively increasing the flow velocity of the water after it enters the drain pipe. A downward guide pipe is installed on the right side of the highest point of the hump-shaped water pipe, using the water entering the hump-shaped water pipe from the right to carry the fine soil particles that have seeped into the pipe away from the drain hole.

[0014] 2. The device in this invention is suitable for high-altitude permafrost regions. By employing a perforated metal shell, it can be prefabricated in the factory and transported to the construction site for immediate use. There is no need to readjust the laying position before backfilling the retaining wall, and the backfill soil compaction process is less prone to deformation and damage, saving construction time and improving construction efficiency. The reverse filtration device is constructed by combining a series of filter layers, including perforated baffles, with filter media in the filter box. This can filter soil carried in the water, while simultaneously improving soil protection and effectively preventing soil erosion. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 For the present invention Figure 1 A partial structural diagram at point A in the middle;

[0018] Figure 3 This is a cross-sectional view of the structure of the present invention;

[0019] Figure 4 For the present invention Figure 3 A partial structural diagram at point B;

[0020] Figure 5 This is a schematic diagram of the internal structure of the present invention;

[0021] Figure 6 For the present invention Figure 5 A partial structural diagram at point C;

[0022] Figure 7 This is a schematic diagram of the structure in the installed state of the present invention;

[0023] Figure 8 This is a cross-sectional view of the retaining wall in this invention.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Contact baffle; 2. Hump-shaped water guide pipe; 3. Compressible anti-freeze layer; 4. Drain pipe; 5. Outer circular shell; 6. Rotating rod; 7. Mounting base; 8. Fixing rod; 9. Infiltration hole; 10. Upper partition circular shell; 11. Lower partition circular shell; 12. Inner circular shell; 13. First crushed stone; 14. Second crushed stone; 15. Third crushed stone; 16. Filler; 17. Mounting shaft; 18. Snap-fit ​​groove; 19. Limiting component; 20. Water inlet hole; 21. Extension groove; 22. Mounting groove; 23. Limiting groove; 24. Retaining wall; 25. Drain hole; 26. Inlet component; 27. Snap-fit ​​block. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-8This invention provides a technical solution: a frost-resistant filter structure for drainage holes in a retaining wall, comprising a contact baffle 1, an outer circular shell 5 movably installed on one side of the contact baffle 1, an upper partition circular shell 10 movably installed inside the outer circular shell 5, a lower partition circular shell 11 disposed inside the upper partition circular shell 10, and an inner circular shell 12 disposed inside the lower partition circular shell 11. Both the upper partition circular shell 10 and the lower partition circular shell 11 are movably installed with the contact baffle 1, and the inner circular shell 12 is fixedly connected to the contact baffle 1. A hump-shaped water guide pipe 2 is fixedly installed inside the inner circular shell 12. One end of the hump-shaped water guide pipe 2 is fixed to the contact baffle 1 and a compressible frost-resistant layer 3 is fixedly installed thereon. A drainage pipe 4 is fixedly installed at the end of the compressible frost-resistant layer 3 away from the hump-shaped water guide pipe 2. A fixing component is fixedly installed on the side of the contact baffle 1 away from the outer circular shell 5.

[0028] In operation, to achieve the functions of frost heave prevention, filtration, and soil protection, and to effectively prevent soil erosion, frost heave of the retaining wall 24, and device damage, this invention provides a frost heave prevention and filtration device suitable for high-altitude and cold regions. It mainly consists of a multi-layered hemispherical filter layer formed by an outer circular outer shell 5, an upper partition circular outer shell 10, a lower partition circular outer shell 11, and an inner circular outer shell 12, and a camel-hump-shaped water guide pipe 2 installed in the innermost layer. This device can be prefabricated elsewhere and then transported to the construction site for installation and use. The multi-layered hemispherical filter layer is a hemispherical rigid material shell with several water outlet holes on its surface. Each layer is filled with a first crushed stone 13, a second crushed stone 14, and a third crushed stone 15, respectively, so that each layer is filled with filter crushed stone of different particle sizes, with the inner layer having a smaller particle size than the outer layer. A camel-hump-shaped water guide pipe 2 wrapped with permeable geotextile is installed in the innermost layer, and a vertical water-repellent frost heave prevention layer is installed at the end of the camel-hump-shaped water guide pipe 2. The drainage conduit is connected to the hump-shaped drainage pipe 2, and multiple fixing rods 8 of a certain length are installed on the circular outer shell. The upper half of the hump-shaped drainage pipe 2 is provided with a large number of water inlet holes 20, while the lower half has no water inlet holes 20. The surface of the drainage pipe is wrapped with a permeable reverse filter geotextile. At the end of the hump-shaped drainage pipe 2 near the retaining wall 24, a vertical, highly compressible rectangular anti-frost heave structure is installed.

[0029] This invention is applicable to retaining walls 24 in high-altitude permafrost regions. Through a multi-layered hemispherical filter layer formed by an outer circular shell 5, an upper circular shell 10, a lower circular shell 11, and an inner circular shell 12, when water flows from the protected soil into the outer circular shell 5, most of the coarse soil particles are retained in the outer circular shell 5. Some fine soil particles are carried by the water flow into the first crushed stone material 13. The fine soil particles carried by the water flow through the holes in the mesh-like interwoven structure into the second crushed stone material 14 layer. In the second crushed stone material 14, most of the fine soil particles are retained on the surface of the gravel. Simultaneously, the water flow carries the remaining fine soil through the third crushed stone material layer composed of geotextile. Material 15: The remaining fine soil particles in the third crushed stone material 15 are attached to the surface of this layer of crushed gravel. The further you go, the less likely the fine soil particles will be lost, thus protecting the soil and preventing soil erosion. In addition, by adopting a hump-shaped water pipe 2 with an inlet hole 20 at the top and wrapping the water pipe with permeable geotextile, the inlet area is increased, which blocks the entry of fine soil particles and increases the height difference between the inlet and the drain pipe 4. This can effectively increase the flow velocity of the water after it enters the drain pipe 4. A downward guide pipe is set on the right side of the highest point of the hump-shaped water pipe 2. The water entering the hump-shaped water pipe 2 from the right side carries the fine soil particles that have seeped into the pipe away from the drain hole 25.

[0030] As a further embodiment of the present invention, the fixing component includes a mounting shaft 17, which is fixedly mounted on the contact baffle 1. A fixing rod 8 is fixedly mounted on the outer surface of the mounting shaft 17. A filling cavity is provided between the fixing rod 8 and the mounting shaft 17. A plurality of permeation holes 9 are provided on the fixing rod 8. A mounting seat 7 is rotatably mounted on the mounting shaft 17 corresponding to the fixing rod 8 and the contact baffle 1.

[0031] During operation, when installing this device, the front end of the fixing rod 8 is embedded into the retaining wall 24, and then the front end of the external hose is fixed to the mounting groove 22 on the mounting base 7. The water droplet external hose guides the adhesive grout into the mounting base 7 through the limiting member 19, and then the grout enters the filling cavity between the fixing rod 8 and the mounting shaft 17 through the extension groove 21. As the amount of adhesive grout injected increases, the grout overflows from the seepage hole 9 on the fixing rod 8 and enters the inner wall of the fixing groove of the retaining wall 24. After a certain amount is injected, the external hose fixed on the mounting groove 22 is removed, and the device is pushed into the retaining wall 24 again, thereby... The mounting base 7 is embedded into the fixing groove on the retaining wall 24. Then, the micro motor drives the mounting base 7 to rotate, which in turn drives the rotating rod 6 to rotate. This causes the rotating rod 6 to stir the adhesive grout in the fixing groove evenly, ensuring that the adhesive grout is evenly distributed in the fixing groove. This allows the fixing rod 8 to adhere firmly to the retaining wall 24, ensuring stable installation. During disassembly, the mounting base 7 is driven to rotate, which in turn drives the rotating rod 6 to rotate. This causes the rotating rod 6 to break the solidified adhesive grout, making it easy to disconnect the fixing rod 8 from the fixing groove on the retaining wall 24 for easy disassembly and replacement.

[0032] The device in this invention is suitable for high-altitude permafrost regions. By employing a perforated metal shell, it can be prefabricated in the factory and transported to the construction site for immediate use. No readjustment of the laying position is required before backfilling the retaining wall, and deformation and damage are less likely during the compaction process of the backfill soil, saving construction time and improving efficiency. The reverse filtration device is constructed by combining a series of filter layers, including perforated baffles, with filter media in the filter box. This effectively filters soil carried in the water, enhancing soil protection and preventing soil erosion.

[0033] As a further embodiment of the present invention, a snap-fit ​​groove 18 is provided on the upper surface of the mounting base 7, a limiting member 19 is fixedly installed in the snap-fit ​​groove 18, an extension groove 21 is provided between the mounting base 7 and the filling cavity, a plurality of rotating rods 6 are fixedly installed on the side of the mounting base 7 near the fixing rod 8, a micro motor is fixedly installed in the contact baffle 1, and the output end of the micro motor is fixedly connected to the mounting base 7.

[0034] As a further embodiment of the present invention, a plurality of mounting grooves 22 are provided on the side of the contact baffle 1 near the outer circular outer shell 5, corresponding to the positions of the outer circular outer shell 5, the upper partition circular outer shell 10 and the lower partition circular outer shell 11, and a limiting groove 23 is provided on one side of the mounting groove 22.

[0035] During operation, when disassembling the outer circular shell 5, the upper partition circular shell 10, and the lower partition circular shell 11, rotate the outer circular shell 5, the upper partition circular shell 10, and the lower partition circular shell 11 to rotate the locking block 27 from the limiting groove 23 position to the mounting groove 22 position. Then, disassemble the outer circular shell 5, the upper partition circular shell 10, and the lower partition circular shell 11 to the outside of the contact baffle 1, so that the outer circular shell 5, the upper partition circular shell 10, and the lower partition circular shell 11 can all be disassembled, which facilitates the free replacement of the first crushed stone 13, the second crushed stone 14, and the third crushed stone 15 during use.

[0036] As a further embodiment of the present invention, a plurality of guide members 26 are fixedly installed on the outer circular shell 5, the upper partition circular shell 10 and the lower partition circular shell 11 near the contact baffle 1. A snap-fit ​​block 27 is fixedly installed on one end of the guide member 26 near the contact baffle 1. The snap-fit ​​block 27 matches the limiting groove 23. The inner side of the outer circular shell 5 is attached to the outer side of the upper partition circular shell 10, the inner side of the upper partition circular shell 10 is attached to the outer side of the lower partition circular shell 11, and the inner side of the lower partition circular shell 11 is attached to the outer side of the inner circular shell 12.

[0037] As a further embodiment of the present invention, multiple water outlet holes are provided on the outer circular shell 5, the upper partition circular shell 10, the lower partition circular shell 11, the inner circular shell 12, and the contact baffle 1. The outer circular shell 5 and the upper partition circular shell 10 are filled with first crushed stone material 13, the upper partition circular shell 10 and the lower partition circular shell 11 are filled with second crushed stone material 14, and the lower partition circular shell 11 and the inner circular shell 12 are filled with third crushed stone material 15. The particle size of the first crushed stone material 13, the second crushed stone material 14, and the third crushed stone material 15 gradually decreases.

[0038] As a further embodiment of the present invention, the upper surface of the hump-shaped water pipe 2 is provided with a plurality of water inlet holes 20, the compressible anti-freezing layer 3 is rectangular and vertically arranged at one end of the hump-shaped water pipe 2 and the drain pipe 4, and the inner circular outer shell 12 is provided with filler material 16.

[0039] The frost heave device for the drainage hole 25 of the retaining wall 24 in the high-altitude permafrost region of this invention is achieved by setting a compressible anti-frost heave layer 3 (a layer of compressible hydrophobic material) in the drainage pipe 4. When water enters the drainage pipe 4 in winter and freezes, the hydrophobic material can be compressed to avoid damage to the drainage pipe or even the drainage hole 25 caused by the freezing heave of the water.

[0040] As a further embodiment of the present invention, a retaining wall 24 is provided on one side of the contact baffle 1. A fixing groove is provided on the retaining wall 24, which matches the fixing rod 8. A drainage hole 25 is provided on the retaining wall 24, and a drainage pipe 4 is fixedly installed on the upper end of the drainage hole 25.

Claims

1. A frost-resistant filter structure for drainage holes in a retaining wall, comprising a contact baffle (1), characterized in that: An outer circular shell (5) is movably installed on one side of the contact baffle (1). An upper partition circular shell (10) is movably installed inside the outer circular shell (5). A lower partition circular shell (11) is disposed inside the upper partition circular shell (10). An inner circular shell (12) is disposed inside the lower partition circular shell (11). Both the upper partition circular shell (10) and the lower partition circular shell (11) are movably installed with the contact baffle (1). The contact baffle (1) is fixedly connected to the shell (12). A hump-shaped water pipe (2) is fixedly installed inside the inner circular shell (12). One end of the hump-shaped water pipe (2) is fixed on the contact baffle (1) and a compressible anti-freeze layer (3) is fixedly installed. A drain pipe (4) is fixedly installed at the end of the compressible anti-freeze layer (3) away from the hump-shaped water pipe (2). A fixing component is fixedly installed on the side of the contact baffle (1) away from the outer circular shell (5). Multiple water outlet holes are provided on the outer circular shell (5), the upper partition circular shell (10), the lower partition circular shell (11), the inner circular shell (12), and the contact baffle (1); The fixing assembly includes a mounting shaft (17), which is fixedly mounted on the contact baffle (1). A fixing rod (8) is fixedly mounted on the outer surface of the mounting shaft (17). A filling cavity is provided between the fixing rod (8) and the mounting shaft (17). A plurality of permeation holes (9) are provided on the fixing rod (8). A mounting seat (7) is rotatably mounted on the mounting shaft (17) corresponding to the fixing rod (8) and the contact baffle (1). The upper surface of the mounting base (7) is provided with a snap-fit ​​groove (18), and a limiting component (19) is fixedly installed in the snap-fit ​​groove (18). An extension groove (21) is provided between the mounting base (7) and the filling cavity. Multiple rotating rods (6) are fixedly installed on the side of the mounting base (7) near the fixing rod (8). A micro motor is fixedly installed in the contact baffle (1), and the output end of the micro motor is fixedly connected to the mounting base (7). The upper surface of the hump-shaped water pipe (2) is provided with multiple water inlet holes (20), the compressible anti-freezing layer (3) is rectangular and vertically arranged at one end of the hump-shaped water pipe (2) and the drain pipe (4), and the inner circular outer shell (12) is provided with filler (16). A retaining wall (24) is provided on one side of the contact baffle (1). A fixing groove is provided on the retaining wall (24). The fixing groove matches the fixing rod (8). A drainage hole (25) is opened on the retaining wall (24). The drainage pipe (4) is fixedly installed on the upper end of the drainage hole (25). A multi-layered hemispherical filter layer is formed by an outer circular shell (5), an upper partition circular shell (10), a lower partition circular shell (11), and an inner circular shell (12).

2. The anti-frost heave reverse filter structure for drainage holes in a retaining wall according to claim 1, characterized in that: On the side of the contact baffle (1) near the outer circular shell (5), a plurality of mounting grooves (22) are provided corresponding to the outer circular shell (5), the upper partition circular shell (10) and the lower partition circular shell (11), and a limiting groove (23) is provided on one side of the mounting groove (22).

3. The anti-frost heave reverse filter structure for drainage holes in a retaining wall according to claim 2, characterized in that: Multiple guide pieces (26) are fixedly installed on the outer circular shell (5), the upper partition circular shell (10), and the lower partition circular shell (11) near the contact baffle (1). A snap-fit ​​block (27) is fixedly installed on one end of the guide piece (26) near the contact baffle (1). The snap-fit ​​block (27) matches the limiting groove (23). The inner side of the outer circular shell (5) is attached to the outer side of the upper partition circular shell (10). The inner side of the upper partition circular shell (10) is attached to the outer side of the lower partition circular shell (11). The inner side of the lower partition circular shell (11) is attached to the outer side of the inner circular shell (12).

4. The anti-frost heave reverse filter structure for drainage holes in a retaining wall according to claim 3, characterized in that: The outer circular shell (5) and the upper partition circular shell (10) are filled with a first crushed stone material (13), the upper partition circular shell (10) and the lower partition circular shell (11) are filled with a second crushed stone material (14), and the lower partition circular shell (11) and the inner circular shell (12) are filled with a third crushed stone material (15). The particle size of the first crushed stone material (13), the second crushed stone material (14) and the third crushed stone material (15) gradually decreases.

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