Staged filling bagged sand cofferdam structure for hydraulic reclamation area

Abstract

The invention discloses a staged filling bagged sand cofferdam structure for a hydraulic reclamation area, and relates to the technical field of water conservancy and hydropower engineering, the staged filling bagged sand cofferdam structure comprises a foundation, pile foundations are arranged on the inner wall of the foundation, through the arrangement of a protection device, a traditional cofferdam is poor in anti-scouring capacity in the ocean, local collapse is prone to occurring under the action of water flow, and the later maintenance cost is high; bagged sand is added and filled between the sheet piles and the inner protective layer to form a filling layer, compared with a single-layer cofferdam, the strength and the waterproof performance are more prominent, under long-term arrangement of the cofferdam, the cofferdam can directly bear periodic flapping of waves, and structural fatigue is prone to being caused, and at the moment, through buffering of a wave-proof plate and an auxiliary plate, the cofferdam is prevented from falling off. High-frequency alternating loads are converted into low-frequency and small-amplitude stable loads, so that fatigue damage to cofferdam materials is reduced, the buoyancy platform can ascend along the guide rod through the water level, and therefore the cofferdam is adaptive to wave impact of different water levels.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering technology, specifically to a graded filling bagged sand cofferdam structure for reclamation areas. Background Technology

[0002] The soft soil foundation in the reclamation area has low bearing capacity, and the rigid cofferdam has a large self-weight, which can easily cause uneven settlement of the foundation, leading to the tilting of the cofferdam and cracking of the joints. At the same time, the rigid structure cannot adapt to the dynamic changes in water level. At high water levels, it is necessary to raise it further, and at low water levels, there is a serious waste of materials. The erosion resistance of the flexible cofferdam is weak: the bags of the single sandbag cofferdam are loose and have poor interlocking. When impacted by water flow, the bags are prone to slippage and sand loss. The water-blocking height and impact resistance are difficult to meet the needs of deep water areas. The geomembrane cofferdam has weak puncture resistance and is easily worn and damaged by sand particles carried by water flow.

[0003] Patent publication number CN214530728U relates to the field of cofferdam engineering technology. It includes an inner cylinder and an outer cylinder coaxially sleeved outside the inner cylinder. A soil and rock layer is formed between the inner and outer cylinders to accommodate soil and rock. An adjustment port is provided through the outer cylinder along its length. An adjustment groove is provided at one end of the outer cylinder near the adjustment port, and an adjustment plate corresponding to the adjustment groove is provided at the other end. The adjustment plate is inserted into the adjustment groove. Two adjustment rods and one threaded rod are provided on the outer wall of the outer cylinder. The two adjustment rods are located on both sides of the adjustment port, and the threaded rod passes through the adjustment rod. A first nut is screwed to each end of the threaded rod. This design has the advantage of facilitating the adjustment of the cofferdam diameter.

[0004] The aforementioned patent has obvious limitations in practice: without a protective structure, the lateral impact force of the water flow on the cofferdam cannot be decomposed and acts directly on the cofferdam body, which will push the cofferdam to slide inward into the reclamation area. Especially on the soft soil foundation of the reclamation area, the amount of sliding can exceed the design allowable value, thereby destroying the water-blocking and separation functions of the cofferdam. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a graded filling bagged sand cofferdam structure for reclamation areas, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a graded filling bagged sand cofferdam structure for reclamation areas, comprising a foundation, wherein pile foundations are embedded within the foundation, backfill is provided above the foundation, sheet piles are embedded within the foundation, and an inner protective layer is provided on top of the backfill. The cofferdam structure further includes: Protective devices are installed on the surface of the sheet piles to reduce structural fatigue of the cofferdam; Guide rod, which is fixedly installed on the surface of the sheet pile; The protective mechanism includes a buoyancy platform, a wave deflector, a guide rod, a ball joint, and an auxiliary plate. The buoyancy platform is slidably mounted on the guide rod, the wave deflector is rotatably mounted on the surface of the buoyancy platform, the guide rod is fixedly mounted on the surface of the wave deflector, the fixed end of the ball joint is fixedly mounted on the circumferential surface of the guide rod, and the auxiliary plate is fixedly mounted on the movable end of the ball joint. The auxiliary plate first absorbs the impact of the waves, allowing it to move along the circumferential surface of the guide rod under the setting of the ball joint. During the movement, it compresses or stretches a first spring on one side, converting the kinetic energy of the waves into elastic potential energy. After the waves recede, the first spring resets, causing the auxiliary plate to rebound, avoiding local stress concentration caused by rigid collisions. Subsequently, the wave deflector absorbs the remaining impact again. Auxiliary devices are installed on the surface of the sheet piles to assist in operations during high water levels; A reinforcement device, installed on the surface of the inner protective layer, is used to reinforce the bagged sand. According to the above technical solution, a filling layer is provided between the sheet piles and the inner protective layer. The pile foundation is inserted into the foundation by a pile driver to stabilize the pile foundation. Then, sheet piles are added to resist the horizontal pressure. However, a single layer of sheet piles is not enough to resist the strong water pressure difference. Therefore, bagged sand is added between the sheet piles and the inner protective layer to form a filling layer. A support frame is provided on the inner wall of the inner protective layer. By installing the support frame on the inner wall of the inner protective layer, the strong water pressure difference on both sides is offset. Then, the water inside is pumped out. Due to the water level difference, the water outside the cofferdam seeps in from the bottom. At this time, the soil above the hard ground layer is dug out by an excavator, and then backfill is poured. A reset torsion spring is provided between the wave deflector and the buoyancy platform. The reset torsion spring drives the wave deflector to reset. A No. 1 spring is provided between the ball head shaft and the guide rod. The No. 1 spring drives the ball head shaft to reset.

[0007] According to the above technical solution, the protective device includes a support rod, a hydraulic rod, and a brake rod. The support rod is rotatably mounted on the surface of the buoyancy platform. The fixed end of the hydraulic rod is rotatably mounted on the inner wall of the support rod. The sliding end of the hydraulic rod is fixedly mounted on the surface of the wave deflector. The brake rod is fixedly mounted on the top of the buoyancy platform. When the buoyancy platform moves, it will simultaneously drive the brake rod to move.

[0008] According to the above technical solution, a second reset torsion spring is provided between the support rod and the buoyancy platform. The second reset torsion spring drives the support rod to reset. A third reset torsion spring is provided between the fixed end of the hydraulic rod and the support rod. The third reset torsion spring drives the fixed end of the hydraulic rod to reset. The top of the brake rod is set in an arc shape. The arc shape increases the friction with the release groove.

[0009] According to the above technical solution, the auxiliary device includes an elastic telescopic frame, a sealing plate, and a limiting groove. The fixed end of the elastic telescopic frame is fixedly installed on the surface of the sheet pile, the sealing plate is rotatably installed on the surface of the sheet pile, the limiting groove is opened on the surface of the elastic telescopic frame, and a reset torsion spring is provided between the sealing plate and the sheet pile. The reset torsion spring is used to drive the sealing plate to reset. The sliding end of the elastic telescopic frame is in contact with the sealing plate. When the movable end of the elastic telescopic frame is in a compressed state, the sealing plate covers the top opening of the elastic telescopic frame after it is stored.

[0010] According to the above technical solution, the auxiliary device further includes a fixed rod, a limiting plate, a release groove, and a rotating paddle. The fixed rod is fixedly installed on the circumferential surface of the sheet pile, the limiting plate is slidably installed on the circumferential surface of the fixed rod, the release groove is opened on the inner wall of the limiting plate, and the rotating paddle is rotatably installed on the inner wall of the sheet pile. When the water level continues to rise to the preset highest point, the brake rod moves upward continuously and eventually releases from the release groove. Under the action of the inclined surface of the release groove, the limiting plate moves outward along the circumferential surface of the fixed rod, causing the limiting plate to disengage from the limiting groove. At this time, the movable end of the elastic telescopic frame is released and extends upward.

[0011] According to the above technical solution, the surface of the limiting plate near the elastic telescopic frame is set as an inclined surface, and a spring is provided between the limiting plate and the fixing rod. The limiting plate is reset by the spring, and the bottom of the release groove is set as an inclined surface.

[0012] According to the above technical solution, the reinforcement device includes a reinforcement layer, a reinforcement plate, and a gear. The reinforcement layer is disposed on the inner wall of the inner protective layer. The reinforcement plate is slidably installed on the surface of the reinforcement layer. The gear is fixedly installed on the surface of the rotating paddle near the reinforcement plate. The rotation of the rotating paddle drives the gear to rotate.

[0013] According to the above technical solution, the reinforcement device further includes a rack and a round rod. The rack is fixedly installed on the circumferential surface of the reinforcement plate, and the round rod is fixedly installed on the surface of the rack. The gear meshes with the rack, and the movement of the round rod will drive the rack to move.

[0014] According to the above technical solution, the reinforcement device further includes a sliding button and a second spring. The sliding button is slidably mounted on the circumferential surface of the round rod, and the second spring is disposed between the sliding button and the round rod. The second spring drives the sliding button to reset. A rack is provided on the surface of the sliding button near the gear. The rack meshes with the gear. When the gear rotates clockwise, it continuously contacts the rack on the sliding button, causing the sliding button to continuously reset under the setting of the second spring. When the gear rotates counterclockwise, the sliding button moves upward and finally contacts the round rod. At this time, the sliding button moves to its maximum distance, and then drives the round rod to move upward, so that the rack enters the driving range of the gear. The movement of the rack drives the reinforcement plate to move along the reinforcement layer, and the reinforcement plate moves along the inner wall of the inner protective layer.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, through the setting of protective devices, traditional cofferdams have weak erosion resistance in the ocean and are prone to local collapse under the action of water flow, resulting in high maintenance costs. By adding bagged sand between the sheet piles and the inner protective layer to form a filling layer, the strength and waterproof performance are more outstanding compared to single-layer cofferdams. Under long-term placement, the cofferdam is prone to structural fatigue due to the periodic impact of waves. At this time, the high-frequency alternating load is converted into a low-frequency, small-amplitude stable load through the buffering of the wave baffle and auxiliary plate, thereby reducing fatigue damage to the cofferdam material. The buoyancy platform can be raised along the guide rod by the water level, thereby adapting to the wave impact at different water levels.

[0016] 2. In this invention, through the setting of auxiliary devices, the elastic telescopic frame is configured such that: the movable end of the elastic telescopic frame is housed inside the sheet pile by inserting the limiting plate into the limiting groove, without affecting the cofferdam structure under normal water level; when the water level continues to rise to the preset highest point, the brake rod moves upward and eventually disengages from the release groove. Under the action of the inclined surface of the release groove, the limiting plate moves outward along the circumference of the fixed rod, causing the limiting plate to disengage from the limiting groove. At this time, the movable end of the elastic telescopic frame is released and extends upward, which can increase the water blocking height to a certain extent and accurately cover the extreme value range of water level fluctuations. When the movable end of the elastic telescopic frame is in a compressed state, the top opening after the elastic telescopic frame is housed is covered by the sealing plate to prevent rainwater and splash water from seeping into the internal cavity of the telescopic plate through the opening gap. Compared with the unsealed design, this effectively protects the internal elastic elements and unlocking mechanism from water erosion damage.

[0017] 3. In this invention, by setting up a reinforcement device, the reinforcement plate moves along the inner wall of the inner protective layer, which continuously applies a cyclical force of compression to relaxation to the filling bag sand in the middle, making the bag sand fill the gap between the sheet pile and the inner protective layer more tightly, eliminating the loose areas of the bag sand, and changing the overall structure from loose stacking to dense embedding, thereby improving the impact resistance. The faster the water flow speed and the higher the rotation speed of the paddle, the greater the movement frequency and compression force of the reinforcement plate. Under extreme water flow conditions, the bag sand is compressed more densely, and the fit between the inner protective layer and the sheet pile is higher, forming an adaptive impact-resistant system that becomes tighter the reinforcement as the water flow is stronger. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the auxiliary plate and the wave-damping plate of the present invention; Figure 3 This is a schematic diagram of the structure at the location of the pile foundation and the backfill in this invention; Figure 4 This is a schematic diagram of the structure at the location of the support frame and the inner protective layer of the present invention; Figure 5 This is a schematic diagram of the structure at the positions of the guide rod and the auxiliary plate of the present invention; Figure 6 This is a schematic diagram of the structure at the positions of the buoyancy platform and the brake lever of the present invention; Figure 7 This is a schematic diagram of the structure at the location of the elastic telescopic frame and the sealing plate of the present invention; Figure 8 This is a schematic diagram of the structure at the location of the guide rod and the buoyancy platform of the present invention; Figure 9 For the present invention Figure 7 Enlarged schematic diagram of part A of the structure; Figure 10 This is a schematic diagram of the structure at the location of the reinforcing layer and the reinforcing plate of the present invention; Figure 11 This is a schematic diagram of the structure at the position of the gear and the rotating propeller in this invention; Figure 12 This is a schematic diagram of the structure at the position of the rack and reinforcing plate of the present invention; Figure 13 For the present invention Figure 12 An enlarged schematic diagram of the structure of part B in the middle section.

[0019] The meanings of the labels in the diagram are as follows: 1. Foundation; 2. Pile foundation; 3. Backfill; 4. Sheet pile; 5. Filling layer; 6. Inner protective layer; 7. Support frame; 10. Guide rod; 11. Buoyancy platform; 12. Wave deflector; 13. Guide rod; 14. Ball joint shaft; 15. Auxiliary plate; 16. Support rod; 17. Hydraulic rod; 18. Brake rod; 19. Spring No. 1; 20. Elastic telescopic frame; 21. Sealing plate; 22. Limiting groove; 23. Fixing rod; 24. Limiting plate; 25. Release groove; 26. Rotating propeller; 30. Reinforcement layer; 31. Reinforcement plate; 32. Gear; 33. Rack rod; 34. Round rod; 35. Sliding button; 36. Spring No. 2. Detailed Implementation

[0020] 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.

[0021] Please see Figures 1-13 One embodiment of the present invention is: a graded filling bagged sand cofferdam structure for reclamation areas, comprising a foundation 1, pile foundations 2 embedded in the foundation 1, fill 3 above the foundation 1, sheet piles 4 embedded in the foundation 1, and an inner protective layer 6 on top of the fill 3. The cofferdam structure further includes: Protective devices are installed on the surface of sheet pile 4 to reduce structural fatigue of the cofferdam; Guide rod 10, the guide rod 10 is fixedly installed on the surface of sheet pile 4; The protective mechanism includes a buoyancy platform 11, a wave deflector 12, a guide rod 13, a ball joint shaft 14, and an auxiliary plate 15. The buoyancy platform 11 is slidably mounted on the guide rod 10, the wave deflector 12 is rotatably mounted on the surface of the buoyancy platform 11, the guide rod 13 is fixedly mounted on the surface of the wave deflector 12, the fixed end of the ball joint shaft 14 is fixedly mounted on the circumferential surface of the guide rod 13, and the auxiliary plate 15 is fixedly mounted on the movable end of the ball joint shaft 14. An auxiliary device is installed on the surface of sheet pile 4 to assist in operations during high water levels; A reinforcement device is installed on the surface of the inner protective layer 6 to reinforce the filled bagged sand.

[0022] A filling layer 5 is provided between the sheet pile 4 and the inner protective layer 6. Compared with a single-layer cofferdam, it is more outstanding in terms of strength and waterproof performance by using a "sandwich" method. A support frame 7 is provided on the inner wall of the inner protective layer 6 to offset the strong water pressure difference on both sides. A reset torsion spring is provided at the connection between the wave baffle 12 and the buoyancy platform 11. The wave baffle 12 is reset by the reset torsion spring. A No. 1 spring 19 is provided between the ball head shaft 14 and the guide rod 13. The ball head shaft 14 is reset by the No. 1 spring 19.

[0023] The protective device includes a support rod 16, a hydraulic rod 17, and a brake rod 18. The support rod 16 is rotatably mounted on the surface of the buoyancy platform 11. The fixed end of the hydraulic rod 17 is rotatably mounted on the inner wall of the support rod 16. The sliding end of the hydraulic rod 17 is fixedly mounted on the surface of the wave deflector 12. The brake rod 18 is fixedly mounted on the top of the buoyancy platform 11. The device converts high-frequency alternating loads into low-frequency, small-amplitude stable loads, thereby reducing fatigue damage to the cofferdam material.

[0024] A second reset torsion spring is provided between the support rod 16 and the buoyancy platform 11. The second reset torsion spring drives the support rod 16 to reset. A third reset torsion spring is provided between the fixed end of the hydraulic rod 17 and the support rod 16. The third reset torsion spring drives the fixed end of the hydraulic rod 17 to reset. The top of the brake rod 18 is designed with an arc shape. The arc shape allows the brake rod 18 to make better contact with the release groove 25.

[0025] The auxiliary device includes an elastic telescopic frame 20, a sealing plate 21, and a limiting groove 22. The fixed end of the elastic telescopic frame 20 is fixedly installed on the surface of the sheet pile 4, the sealing plate 21 is rotatably installed on the surface of the sheet pile 4, and the limiting groove 22 is opened on the surface of the elastic telescopic frame 20. A reset torsion spring 4 is provided between the sealing plate 21 and the sheet pile 4. The reset torsion spring 4 drives the sealing plate 21 to reset. The sliding end of the elastic telescopic frame 20 contacts the sealing plate 21, which can increase the water blocking height to a certain extent and accurately cover the extreme range of water level fluctuations.

[0026] The auxiliary device also includes a fixed rod 23, a limiting plate 24, a release groove 25, and a rotating paddle 26. The fixed rod 23 is fixedly installed on the circumferential surface of the sheet pile 4, the limiting plate 24 is slidably installed on the circumferential surface of the fixed rod 23, the release groove 25 is opened on the inner wall of the limiting plate 24, and the rotating paddle 26 is rotatably installed on the inner wall of the sheet pile 4. When the movable end of the elastic telescopic frame 20 is in a compressed state, the top opening of the elastic telescopic frame 20 after being stored is covered by the sealing plate 21 to prevent rainwater and splash water from seeping into the internal cavity of the telescopic plate along the opening gap. Compared with the unsealed design, it effectively protects the internal elastic elements and unlocking mechanism from water erosion damage.

[0027] The surface of the limiting plate 24 near the elastic telescopic frame 20 is set as an inclined surface. A spring is provided between the limiting plate 24 and the fixing rod 23. The limiting plate 24 is reset by the spring. The bottom of the release groove 25 is set as an inclined surface.

[0028] The reinforcement device includes a reinforcement layer 30, a reinforcement plate 31, and a gear 32. The reinforcement layer 30 is disposed on the inner wall of the inner protective layer 6. The reinforcement plate 31 is slidably mounted on the surface of the reinforcement layer 30. The gear 32 is fixedly mounted on the surface of the rotating paddle 26 near the reinforcement plate 31, so that the overall structure changes from loose stacking to dense fitting, thereby improving the impact resistance.

[0029] The reinforcement device also includes a rack 33 and a round rod 34. The rack 33 is fixedly installed on the circumferential surface of the reinforcement plate 31, and the round rod 34 is fixedly installed on the surface of the rack 33. The gear 32 meshes with the rack 33. The faster the water flow speed, the higher the rotation speed of the rotating paddle 26. The faster the gear 32 rotates, the greater the moving frequency and squeezing force of the reinforcement plate 31.

[0030] The reinforcement device also includes a sliding button 35 and a second spring 36. The sliding button 35 is slidably mounted on the circumferential surface of the round rod 34. The second spring 36 is disposed between the sliding button 35 and the round rod 34. The sliding button 35 is reset by the second spring 36. A rack is provided on the surface of the sliding button 35 near the gear 32. The rack meshes with the gear 32.

[0031] In this embodiment, traditional cofferdams have weak erosion resistance in the ocean and are prone to local collapse under the action of water flow, resulting in high maintenance costs. The site in this project is primarily oceanic, with significant tidal fluctuations. Piles 2 are driven into the foundation 1 using a pile driver to stabilize the piles. Sheet piles 4 are then added to resist horizontal pressure. However, a single layer of sheet piles 4 is insufficient to withstand the strong water pressure difference. Therefore, bagged sand is added between the sheet piles 4 and the inner protective layer 6 to form a filling layer 5. Compared to a single-layer cofferdam, this provides greater strength. In terms of waterproofing performance, a support frame 7 is installed on the inner wall of the inner protective layer 6 to counteract the strong water pressure difference on both sides. The internal water is then pumped out. Due to the water level difference, water outside the cofferdam seeps in from the bottom. At this point, an excavator removes the soil above the hard ground layer, and then backfill 3 is poured, thus creating a dry and safe environment without water flow and soil. The type, specifications, and technical indicators of the geotextile used for the filling bags should meet the design requirements and comply with the relevant provisions of current industry standards. However, the cofferdam, due to its long construction period... The cofferdam needs to exist for a long time, but long-term placement will gradually lead to performance degradation and even safety hazards due to environmental erosion, structural aging, and changes in operating conditions. In particular, it is prone to structural fatigue when directly subjected to the periodic impact of waves. At this time, the auxiliary plate 15 first absorbs the impact of the waves, and moves along the circumference of the guide rod 13 under the setting of the ball head shaft 14. During the movement, it compresses or stretches the No. 1 spring 19 on one side, converting the kinetic energy of the waves into elastic potential energy. After the waves recede, the No. 1 spring 19 resets and drives the auxiliary plate 15 to rebound, avoiding local stress concentration caused by rigid collision. Then, the wave deflector 12 absorbs the remaining impact again. Through the rotation of the wave deflector 12 and the buffering of the hydraulic rod 17, the high-frequency alternating load is converted into a low-frequency, small-amplitude stable load, thereby reducing fatigue damage to the cofferdam material. The buoyancy platform 11 can rise along the guide rod 10 according to the water level, thereby adapting to the wave impact of different water levels. When the buoyancy platform 11 moves, it also drives the brake rod 18 to move.

[0032] Please see Figures 1-13 Based on the above embodiments, in another embodiment of the present invention, the graded filling bagged sand cofferdam structure for reclamation areas further includes auxiliary devices and reinforcement devices.

[0033] In this embodiment, during operation: the rotating paddle 26 is driven by water flow to rotate. The elastic telescopic frame 20 is assumed to be: the movable end of the elastic telescopic frame 20 is housed inside the sheet pile 4 by inserting the limiting plate 24 into the limiting groove 22, without affecting the cofferdam structure under normal water level. When the water level continues to rise to the preset highest point, the brake rod 18 moves upward and eventually releases from the release groove 25. Under the action of the inclined surface of the release groove 25, the limiting plate 24 moves outward along the circumference of the fixed rod 23, causing the limiting plate 24 to disengage from the limiting groove 22. At this time, the movable end of the elastic telescopic frame 20 is released and extends upward, which can increase the water blocking height to a certain extent and accurately cover the extreme value range of water level fluctuation. When the movable end of the elastic telescopic frame 20 is in a compressed state, the top opening of the elastic telescopic frame 20 after it is housed is covered by the sealing plate 21 to prevent rainwater and splash water from seeping into the internal cavity of the telescopic plate along the opening gap. Compared with the unsealed design, it effectively protects the internal elastic elements and unlocking mechanism from water erosion damage. Rotating the paddle 26 drives the gear 32 to rotate. When the gear 32 rotates clockwise, it continuously contacts the rack of the sliding button 35, causing the sliding button 35 to continuously reset under the setting of the second spring 36. When the gear 32 rotates counterclockwise, the sliding button 35 moves upward and eventually contacts the round rod 34. At this point, the sliding button 35 has moved to its maximum distance, subsequently driving the round rod 34 upward. The movement of the round rod 34 then drives the rack rod 33 to move, bringing it into the driving range of the gear 32. The movement of the rack rod 33 then drives the reinforcing plate 31 along the reinforcing layer 30. As the reinforcing plate 31 moves along the inner wall of the inner protective layer 6, it continuously applies a cyclical force of compression to relaxation to the filling bag sand in the middle. This makes the bag sand fill the gap between the sheet pile 4 and the inner protective layer 6 more tightly, eliminating the loose areas of the bag sand and changing the overall structure from loose stacking to dense embedding. This improves the impact resistance. The faster the water flow speed, the higher the rotation speed of the rotating paddle 26, and the greater the moving frequency and compression force of the reinforcing plate 31. Under extreme water flow conditions, the bag sand is compressed more densely, and the fit between the inner protective layer 6 and the sheet pile 4 is higher, forming an adaptive impact-resistant system that becomes tighter the reinforcement as the water flow is stronger.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A graded filling bagged sand cofferdam structure for reclamation areas, comprising a foundation (1), wherein pile foundations (2) are embedded in the foundation (1), fill (3) is provided above the foundation (1), sheet piles (4) are embedded in the foundation (1), and an inner protective layer (6) is provided on top of the fill (3), characterized in that, The cofferdam structure also includes: Protective devices are installed on the surface of the sheet piles (4) to reduce structural fatigue of the cofferdam; Guide rod (10), the guide rod (10) is fixedly installed on the surface of the sheet pile (4); The protective mechanism includes a buoyancy platform (11), a wave deflector (12), a guide rod (13), a ball joint shaft (14), and an auxiliary plate (15). The buoyancy platform (11) is slidably mounted on the guide rod (10). The wave deflector (12) is rotatably mounted on the surface of the buoyancy platform (11). The guide rod (13) is fixedly mounted on the surface of the wave deflector (12). The fixed end of the ball joint shaft (14) is fixedly mounted on the circumferential surface of the guide rod (13). The auxiliary plate (15) is fixedly mounted on the movable end of the ball joint shaft (14). An auxiliary device is installed on the surface of the sheet pile (4) to assist in operation during high water levels; A reinforcement device is installed on the surface of the inner protective layer (6) to reinforce the filled bagged sand.

2. The graded filling bagged sand cofferdam structure for reclamation areas according to claim 1, characterized in that: A filling layer (5) is provided between the sheet pile (4) and the inner protective layer (6). A support frame (7) is provided on the inner wall of the inner protective layer (6). A reset torsion spring is provided between the wave deflector (12) and the buoyancy platform (11). A first spring (19) is provided between the ball head shaft (14) and the guide rod (13).

3. The graded filling bagged sand cofferdam structure for reclamation areas according to claim 2, characterized in that: The protective device includes a support rod (16), a hydraulic rod (17), and a brake rod (18). The support rod (16) is rotatably mounted on the surface of the buoyancy platform (11). The fixed end of the hydraulic rod (17) is rotatably mounted on the inner wall of the support rod (16). The sliding end of the hydraulic rod (17) is fixedly mounted on the surface of the wave deflector (12). The brake rod (18) is fixedly mounted on the top of the buoyancy platform (11).

4. The graded filling bagged sand cofferdam structure for reclamation areas according to claim 3, characterized in that: A second reset torsion spring is provided between the support rod (16) and the buoyancy platform (11), a third reset torsion spring is provided between the fixed end of the hydraulic rod (17) and the support rod (16), and the top of the brake rod (18) is set in an arc shape.

5. The graded filling bagged sand cofferdam structure for reclamation areas according to claim 1, characterized in that: The auxiliary device includes an elastic telescopic frame (20), a sealing plate (21), and a limiting groove (22). The fixed end of the elastic telescopic frame (20) is fixedly installed on the surface of the sheet pile (4). The sealing plate (21) is rotatably installed on the surface of the sheet pile (4). The limiting groove (22) is opened on the surface of the elastic telescopic frame (20). A reset torsion spring is provided between the sealing plate (21) and the sheet pile (4). The sliding end of the elastic telescopic frame (20) is in contact with the sealing plate (21).

6. The graded-filling bagged sand cofferdam structure for reclamation areas according to claim 5, characterized in that: The auxiliary device also includes a fixed rod (23), a limiting plate (24), a release groove (25), and a rotating paddle (26). The fixed rod (23) is fixedly installed on the circumferential surface of the sheet pile (4), the limiting plate (24) is slidably installed on the circumferential surface of the fixed rod (23), the release groove (25) is opened on the inner wall of the limiting plate (24), and the rotating paddle (26) is rotatably installed on the inner wall of the sheet pile (4).

7. The graded-filling bagged sand cofferdam structure for reclamation areas according to claim 6, characterized in that: The surface of the limiting plate (24) near the elastic telescopic frame (20) is set as an inclined surface, a spring is provided between the limiting plate (24) and the fixing rod (23), and the bottom of the release groove (25) is set as an inclined surface.

8. The graded-filling bagged sand cofferdam structure for reclamation areas according to claim 1, characterized in that: The reinforcement device includes a reinforcement layer (30), a reinforcement plate (31), and a gear (32). The reinforcement layer (30) is disposed on the inner wall of the inner protective layer (6). The reinforcement plate (31) is slidably mounted on the surface of the reinforcement layer (30). The gear (32) is fixedly mounted on the surface of the rotating paddle (26) near the reinforcement plate (31).

9. The graded-filling bagged sand cofferdam structure for reclamation areas according to claim 8, characterized in that: The reinforcement device also includes a rack (33) and a round rod (34). The rack (33) is fixedly installed on the circumferential surface of the reinforcement plate (31), and the round rod (34) is fixedly installed on the surface of the rack (33). The gear (32) meshes with the rack (33).

10. The graded-filling bagged sand cofferdam structure for reclamation areas according to claim 9, characterized in that: The reinforcement device also includes a sliding button (35) and a second spring (36). The sliding button (35) is slidably mounted on the circumferential surface of the round rod (34). The second spring (36) is disposed between the sliding button (35) and the round rod (34). A rack is provided on the surface of the sliding button (35) near the gear (32). The rack meshes with the gear (32).

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