Dam body structure of earth rock cofferdam back slope type anti-seepage dam and construction method of dam body structure

Abstract

The invention relates to the field of anti-seepage dam construction, and discloses a dam body structure of an earth rock cofferdam back slope type anti-seepage dam and a construction method thereof.The dam body structure comprises a foundation, a dam body is arranged on the upper side of the foundation, a drainage cavity is formed in the dam body, a mounting plate is fixedly connected to the inner wall of the drainage cavity, and a plurality of drainage cylinders are rotationally matched with the mounting plate; a driving mechanism matched with the drainage cylinder is arranged in the drainage cavity, a connecting pipe is arranged on the inner wall of the drainage cavity, a plurality of rotating joints are arranged on the connecting pipe, the drainage cylinder is rotationally matched with the inner walls of the rotating joints, drainage pipes are fixedly connected to the two ends of the connecting pipe respectively, and flow valves are arranged on the drainage pipes. According to the invention, firstly, the driving mechanism is arranged to drive the drainage cylinder to rotate for drainage, and the adjustable flow valve is matched, so that accumulated water around the dam body can be actively and quickly drained, the water pressure around the dam body is effectively reduced, the lateral pressure borne by the dam body is reduced, and the stability of the dam body is improved.

Description

Technical Field

[0001] The present invention relates to the field of anti-seepage dam construction, in particular to a dam body structure of an earth-rock cofferdam back-slope type anti-seepage dam and a construction method thereof. Background Art

[0002] In the field of water conservancy projects, the anti-seepage structure of the reservoir dam is the core element to ensure the stability and safe operation of the dam body. Its importance is self-evident. The anti-seepage structures commonly used today are mostly constructed in accordance with traditional water conservancy design ideas and have built a preliminary drainage framework, which is mainly used to promptly remove water accumulated inside the dam body and effectively alleviate the seepage pressure of the water body on the dam body.

[0003] In the existing technology, some earth-rock cofferdam anti-seepage dams have the following defects: the drainage system is mostly a passive structure, lacking an active drainage mechanism, making it difficult to accurately adjust the drainage volume according to water level changes, resulting in water accumulation around the dam body, which easily creates water pressure hazards; the anti-seepage system often uses a single material or a simple composite structure. When the dam body is deformed, the anti-seepage layer is prone to cracks and has no self-repair ability, posing a high risk of leakage. Summary of the Invention

[0004] In order to make up for the above shortcomings, the present invention provides a dam body structure of a back-slope anti-seepage dam with an earth-rock cofferdam and a construction method thereof, aiming to improve the problem that the drainage system lacks an active drainage mechanism, and the anti-seepage layer is prone to cracks and has no self-repair ability, resulting in a high risk of leakage, thereby solving the problems raised by the above-mentioned background technology.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: the dam body structure of the back-slope anti-seepage dam of the earth-rock cofferdam includes a foundation, a dam body is installed on the upper side of the foundation, a drainage cavity is opened inside the dam body, a mounting plate is fixedly connected to the inner wall of the drainage cavity, a plurality of drainage cylinders are rotatably engaged with the mounting plate, a driving mechanism that cooperates with the drainage cylinders is provided inside the drainage cavity, a connecting pipe is installed on the inner wall of the drainage cavity, a plurality of rotary joints are installed on the connecting pipe, the drainage cylinders are rotatably engaged with the inner wall of the rotary joint, both ends of the connecting pipe are fixedly connected to drainage pipes, and a flow valve is installed on the drainage pipe;

[0006] A flexible anti-seepage layer is provided on the side wall of the dam body, a rigid anti-seepage layer parallel to the flexible anti-seepage layer is provided on the inner wall of the dam body, and a self-repairing interlayer is provided at the interlayer between the flexible anti-seepage layer and the rigid anti-seepage layer.

[0007] As a further description of the above technical solution:

[0008] The driving mechanism includes a waterproof motor fixedly connected to one side of the inner wall of the drainage cavity, the output end of the waterproof motor is fixedly connected to a worm, the upper side of the inner wall of the drainage cavity is rotatably fitted with multiple bearings, and a worm gear is mounted on the bearings.

[0009] As a further description of the above technical solution:

[0010] One end of the worm is rotatably engaged with one side of the inner wall of the drainage cavity, the worm is meshed with the worm wheel, and the lower end of the bearing is fixedly connected to the upper end of the drainage cylinder.

[0011] As a further description of the above technical solution:

[0012] A sand discharge pipe is fixedly connected to one side of the drainage cavity, a control valve is installed at one end of the sand discharge pipe, and the other end of the sand discharge pipe extends to the inner wall of the drainage cavity.

[0013] As a further description of the above technical solution:

[0014] The upper side of the dam body is fixedly connected with a wave-breaking wall, and the bottom of the inner wall of the drainage cavity is funnel-shaped.

[0015] As a further description of the above technical solution:

[0016] Two inverting filter layers are symmetrically arranged inside the dam body, and an anti-seepage membrane is arranged on opposite sides of the two inverting filter layers.

[0017] As a further description of the above technical solution:

[0018] The flexible anti-seepage layer is a rubber asphalt composite material with a thickness of 0.5 to 2.0 mm. The rigid anti-seepage layer is a plastic concrete anti-seepage wall with a permeability coefficient of ≤1×10 -7 cm / s, the self-repairing interlayer is a polymer water-absorbing resin layer, and its volume expansion rate after contacting water is ≥200%. An optical fiber sensor is pre-buried inside the rigid anti-seepage layer, and a data acquisition instrument is provided on the top of the dam body. The optical fiber sensor is connected to the data acquisition instrument, and the layout spacing of the optical fiber sensors is 0.5 to 1.0 m.

[0019] The construction method of the dam structure of the earth-rock cofferdam back slope anti-seepage dam has the following specific steps:

[0020] S1: Fiber optic sensors are embedded in the rigid anti-seepage layer. The fiber optic sensors are used in conjunction with an external data acquisition device to set alarm thresholds and monitor leakage points in real time. When external water seeps into the dam body, it will pass through the three layers of anti-seepage action of the flexible anti-seepage layer, the self-repairing interlayer and the rigid anti-seepage layer. When the water reaches the rigid anti-seepage layer, the fiber optic sensor will monitor the water flow changes in real time. The data acquisition device receives the fiber optic signal, demodulates it into data, and issues an alarm to achieve monitoring.

[0021] S2: The water flowing into the drainage cavity may carry sediment. When the sediment accumulates to a certain level and needs to be cleared, the control valve at one end of the sediment discharge pipe is opened. Since the bottom of the inner wall of the drainage cavity is funnel-shaped, the sediment will gather to the bottom under the action of gravity and be discharged from the dam body through the sediment discharge pipe, effectively preventing sediment from accumulating in the drainage cavity and clogging the drainage system, ensuring the continuous stability of the drainage function. The two symmetrically arranged filter layers inside the dam body play a key filtering role. When external water flows try to penetrate the dam body, the filter layers can prevent soil particles from entering the dam body with the water flow, allowing only clean water to pass through, preventing the internal structure of the dam body from being damaged by soil loss. At the same time, the anti-seepage membranes located on the opposite side of the two anti-seepage layers further prevent water from penetrating, forming a double anti-seepage protection, greatly enhancing the anti-seepage performance of the dam body, ensuring the stability of the dam structure, and reducing the risk of leakage;

[0022] S3: When there is accumulated water around the dam body that needs to be drained, start the waterproof motor, and the waterproof motor drives the worm to rotate. Since the worm and the worm wheel are meshed, the rotational motion of the worm is converted into the rotation of the worm wheel, and the worm wheel is fixedly connected to the upper end of the drain barrel through a bearing, so that the drain barrel rotates on the inner wall of the rotary joint. The external accumulated water can enter the drainage cavity through the drain barrel, and then converge through the connecting pipe, and finally be discharged from the dam body through the drainage pipes at both ends. In this process, the flow valve can adjust the drainage volume according to the actual drainage needs, accurately control the drainage speed, and ensure that the water level around the dam body is maintained in a safe range. When the drain barrel rotates, under the action of centrifugal force, the mud and sand adhering to the surface of the drain barrel are thrown out to avoid clogging the water inlet hole on the surface of the drain barrel.

[0023] The present invention has the following beneficial effects:

[0024] 1. In the present invention, by arranging a drainage cavity, a drainage cylinder and a driving mechanism inside the dam body, active drainage of accumulated water around the dam body can be achieved, the flow valve can accurately adjust the drainage volume to maintain a safe water level, the rotary joint ensures that the drainage cylinder can rotate flexibly and maintains sealing to prevent water leakage, making the entire drainage process smooth and efficient, effectively reducing the water pressure around the dam body, alleviating the lateral pressure on the dam body, and improving the stability of the dam body; the funnel-shaped design at the bottom of the inner wall of the drainage cavity combined with the sand discharge pipe facilitates the discharge of sediment and prevents clogging of the drainage system; the dual setting of the filter layer and the anti-seepage membrane effectively blocks the penetration of soil particles and ensures the stability of the dam structure; the flexible anti-seepage layer and the rigid anti-seepage layer cooperate with the self-repairing interlayer to form a three-layer anti-seepage system, in which the flexible layer adapts to the deformation of the dam body, the rigid layer has a low permeability coefficient, and the self-repairing interlayer has a water expansion rate of ≥200%, which can automatically fill cracks. The synergistic effect of the three significantly improves the anti-seepage performance.

[0025] 2. In the present invention, the waterproof motor in the drive mechanism drives the drain drum through the meshing transmission of a worm and a worm gear. The rotary joint ensures the flexible rotation of the drain drum while maintaining a seal, preventing water leakage and ensuring a smooth and efficient drainage process. The centrifugal force generated by the rotation of the drain drum removes surface sediment, preventing clogging of the water inlet and improving drainage efficiency. The sand discharge pipe and control valve facilitate the regular cleaning of sediment accumulated in the drainage chamber, and the funnel-shaped bottom design ensures the long-term smooth operation of the drainage system. The wave-breaking wall weakens the impact of waves on the dam body and enhances the dam's ability to withstand wind and waves. The symmetrically arranged filter layer and anti-seepage membrane within the dam body form a double anti-seepage barrier, further preventing water infiltration and soil loss within the dam body. The fiber optic sensor embedded in the rigid anti-seepage layer is connected to the dam top data acquisition device to monitor leakage points in real time and generate accurate alarms through fiber optic signal demodulation, improving the intelligence and reliability of dam leakage monitoring. At the same time, the fiber optic sensor embedded in the rigid layer cooperates with the data acquisition device to monitor leakage points in real time and generate alarms, ensuring the long-term stability and effectiveness of the anti-seepage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional diagram of the dam structure of the earth-rock cofferdam back-slope anti-seepage dam and its construction method proposed in the present invention;

[0027] Figure 2 A schematic diagram of the dam structure of the earth-rock cofferdam back-slope anti-seepage dam and its construction method proposed in the present invention;

[0028] Figure 3 A schematic diagram of a waterproof motor structure of the earth-rock cofferdam back-slope anti-seepage dam and its construction method proposed in the present invention;

[0029] Figure 4 A schematic diagram of the wave-breaking wall structure of the earth-rock cofferdam back-slope anti-seepage dam and its construction method proposed in the present invention;

[0030] Figure 5 This is a schematic diagram of the rigid anti-seepage layer structure of the earth-rock cofferdam back-slope anti-seepage dam proposed in the present invention and its construction method.

[0031] Legend:

[0032] 1. Foundation; 2. Dam body; 3. Drainage cavity; 4. Mounting plate; 5. Drainage cylinder; 6. Driving mechanism; 61. Waterproof motor; 62. Worm; 63. Bearing; 64. Worm gear; 7. Connecting pipe; 8. Rotary joint; 9. Drain pipe; 10. Flow valve; 11. Sand discharge pipe; 12. Control valve; 13. Wave-breaking wall; 14. Filter layer; 15. Anti-seepage membrane; 16. Flexible anti-seepage layer; 17. Self-repairing interlayer; 18. Rigid anti-seepage layer; 19. Data acquisition instrument; 20. Fiber optic sensor. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1

[0035] Please refer to Figure 1-5 The dam body 2 structure of the back-slope anti-seepage dam of the earth-rock cofferdam comprises a foundation 1, a dam body 2 is installed on the upper side of the foundation 1, a drainage cavity 3 is opened inside the dam body 2, the inner wall of the drainage cavity 3 is fixedly connected with a mounting plate 4, a plurality of drainage cylinders 5 are rotatably fitted on the mounting plate 4, a driving mechanism 6 that cooperates with the drainage cylinder 5 is provided inside the drainage cavity 3, a connecting pipe 7 is installed on the inner wall of the drainage cavity 3, a plurality of rotary joints 8 are installed on the connecting pipe 7, both ends of the connecting pipe 7 are fixedly connected with drainage pipes 9 respectively, a flow valve 10 is installed on the drainage pipe 9, a flexible anti-seepage layer 16 is provided on the side wall of the dam body 2, a rigid anti-seepage layer 18 parallel to the flexible anti-seepage layer 16 is provided on the inner wall of the dam body 2, a self-repairing interlayer 17 is provided at the interlayer between the flexible anti-seepage layer 16 and the rigid anti-seepage layer 18, and the drainage cylinder 5 is rotatably fitted on the inner wall of the rotary joint 8. A sand discharge pipe 11 is fixedly connected to one side of the drainage chamber 3. A control valve 12 is installed at one end of the sand discharge pipe 11. The other end of the sand discharge pipe 11 extends to the inner wall of the drainage chamber 3. A wave-breaking wall 13 is fixedly connected to the upper side of the dam body 2. The bottom of the inner wall of the drainage chamber 3 is funnel-shaped. Two symmetrical filter layers 14 are arranged inside the dam body 2. An anti-seepage membrane 15 is arranged on the opposite side of the two filter layers 14. The flexible anti-seepage layer 16 is a rubber asphalt composite material that adapts to the deformation of the dam body and has a thickness of 0.5 to 2.0 mm. The rigid anti-seepage layer 18 is a plastic concrete anti-seepage wall that provides structural support. Its permeability coefficient is ≤1×10 -7 cm / s, the self-repairing interlayer 17 is a polymer water-absorbing resin layer, which realizes automatic filling of cracks and drainage and decompression. The volume expansion rate after contacting water is ≥200%. An optical fiber sensor 20 is pre-buried in the rigid anti-seepage layer 18, and a data acquisition device 19 is provided on the top of the dam body 2. The optical fiber sensor 20 is connected to the data acquisition device 19, and the optical fiber sensor 20 is arranged at a spacing of 0.5 to 1.0 m.

[0036] Implementation process: A flexible anti-seepage layer 16 is provided on the side wall of the dam body 2, and a rigid anti-seepage layer 18 is provided on the inner wall of the dam body 2 parallel to the flexible anti-seepage layer 16. A self-repairing interlayer 17 is provided in the interlayer between the flexible anti-seepage layer 16 and the rigid anti-seepage layer 18. The flexible anti-seepage layer 16 is a rubber asphalt composite material that adapts to the deformation of the dam body and has a thickness of 0.5 to 2.0 mm. The rigid anti-seepage layer 18 is a plastic concrete anti-seepage wall that provides structural support and has a permeability coefficient of ≤1×10 -7 cm / s, the self-repairing interlayer 17 is a polymer water-absorbing resin layer, which realizes automatic filling of cracks and drainage and decompression. The volume expansion rate after contacting water is ≥200%. An optical fiber sensor 20 is embedded in the rigid anti-seepage layer 18. The optical fiber sensor 20 is used in conjunction with an external data acquisition device 19 to set an alarm threshold and monitor the leakage point in real time. When external water seeps into the dam body 2, it will pass through the three layers of anti-seepage effect of the flexible anti-seepage layer 17, the self-repairing interlayer 17 and the rigid anti-seepage layer 18. When the water reaches the rigid anti-seepage layer 18, the optical fiber sensor 20 will monitor the water flow changes in real time. The data acquisition device 19 receives the optical fiber signal and demodulates it into data and alarms to realize the monitoring function. As time goes by, the water flowing into the drainage cavity 3 may carry sediment. When the sediment accumulates to a certain extent and needs to be cleaned, the sediment discharge pipe is opened. The control valve 12 at one end of 11, since the bottom of the inner wall of the drainage chamber 3 is funnel-shaped, the sediment will gather to the bottom under the action of gravity and be discharged from the dam body 2 along the sediment discharge pipe 11, effectively avoiding the sediment accumulation in the drainage chamber 3, preventing the drainage system from being blocked, and ensuring the continuous stability of the drainage function. The two symmetrically arranged filter layers 14 inside the dam body 2 play a key filtering role. When the external water flow tries to penetrate the dam body 2, the filter layer 14 can block the soil particles from entering the dam body 2 with the water flow, and only allow clean water to pass through, preventing the internal structure of the dam body 2 from being damaged due to soil loss. At the same time, the anti-seepage membrane 15 located on the opposite side of the two anti-seepage layers 14 further prevents water from penetrating, forming a double anti-seepage protection, which greatly enhances the anti-seepage performance of the dam body 2, ensures the stability of the dam body 2 structure, and reduces the risk of leakage.

[0037] Implementation benefits: By setting up a drainage cavity, a drainage tube and a driving mechanism inside the dam body, the active discharge of accumulated water around the dam body can be achieved. The flow valve can accurately adjust the drainage volume to maintain a safe water level, effectively reduce the water pressure around the dam body, reduce the lateral pressure on the dam body, and improve the stability of the dam body; the flexible anti-seepage layer and the rigid anti-seepage layer cooperate with the self-repairing interlayer to form a three-layer anti-seepage system, in which the flexible layer adapts to the deformation of the dam body, the rigid layer has a low permeability coefficient, and the self-repairing interlayer expands at a rate of ≥200% when exposed to water, and can automatically fill cracks. The synergistic effect of the three significantly improves the anti-seepage performance; the funnel-shaped design at the bottom of the inner wall of the drainage cavity is combined with a sand discharge pipe to facilitate the discharge of sediment and prevent the drainage system from being blocked; the dual setting of the filter layer and the anti-seepage membrane effectively blocks the penetration of soil particles and ensures the stability of the dam structure; at the same time, the fiber optic sensor embedded in the rigid layer cooperates with the data acquisition instrument to monitor the leakage point in real time and alarm, ensuring the long-term stability and effectiveness of the anti-seepage system.

[0038] Example 2

[0039] The driving mechanism 6 includes a waterproof motor 61 fixedly connected to one side of the inner wall of the drainage chamber 3. The output end of the waterproof motor 61 is fixedly connected to a worm 62. A plurality of bearings 63 are rotatably engaged with the upper side of the inner wall of the drainage chamber 3. A worm gear 64 is installed on the bearing 63. One end of the worm 62 is rotatably engaged with one side of the inner wall of the drainage chamber 3. The worm 62 is engaged with the worm gear 64. The lower end of the bearing 63 is fixedly connected to the upper end of the drainage tube 5.

[0040] Implementation process: When there is accumulated water around the dam body 2 that needs to be drained, start the waterproof motor 61, and the waterproof motor 61 drives the worm 62 to rotate. Since the worm 62 is meshed with the worm wheel 64, the rotational motion of the worm 62 is converted into the rotation of the worm wheel 64, and the worm wheel 64 is fixedly connected to the upper end of the drain barrel 5 through the bearing 63, so that the drain barrel 5 rotates on the inner wall of the rotary joint 8. The external accumulated water can enter the drainage cavity 3 through the drain barrel 5, and then converge through the connecting pipe 7, and finally be discharged from the dam body 2 through the drainage pipes 9 at both ends. In this process, the flow valve 10 can adjust the drainage volume according to the actual drainage needs, accurately control the drainage speed, and ensure that the water level around the dam body 2 is maintained in a safe range. When the drain barrel 5 rotates, under the action of centrifugal force, the mud and sand adhering to the surface of the drain barrel 5 are thrown out to avoid clogging the water inlet hole on the surface of the drain barrel 5.

[0041] Implementation benefits: The waterproof motor in the drive mechanism drives the drainage drum to rotate through the meshing transmission of the worm and the worm gear. The rotary joint ensures the flexible rotation of the drainage drum and maintains the seal to prevent water leakage, making the entire drainage process smooth and efficient; the centrifugal force during the rotation of the drainage drum can throw out the surface mud and sand, avoid clogging of the water inlet, and improve drainage efficiency; the setting of the sand discharge pipe and the control valve facilitates the regular cleaning of the mud and sand accumulated in the drainage cavity, and the funnel-shaped bottom design ensures the long-term smooth flow of the drainage system; the wave-breaking wall can weaken the impact of waves on the dam body and enhance the dam body's ability to resist wind and waves; the symmetrically arranged anti-filtration layer and anti-seepage membrane inside the dam body form a double anti-seepage barrier, further preventing water infiltration and preventing soil loss inside the dam body.

[0042] Working principle: A flexible anti-seepage layer 16 is provided on the side wall of the dam body 2, and a rigid anti-seepage layer 18 is provided on the inner wall of the dam body 2 parallel to the flexible anti-seepage layer 16. A self-repairing interlayer 17 is provided in the interlayer between the flexible anti-seepage layer 16 and the rigid anti-seepage layer 18. The flexible anti-seepage layer 16 is a rubber asphalt composite material that adapts to the deformation of the dam body and has a thickness of 0.5 to 2.0 mm. The rigid anti-seepage layer 18 is a plastic concrete anti-seepage wall that provides structural support and has a permeability coefficient of ≤1×10 -7cm / s, the self-repairing interlayer 17 is a polymer water-absorbing resin layer, which realizes automatic filling of cracks and drainage and decompression. The volume expansion rate after contacting water is ≥200%. An optical fiber sensor 20 is embedded in the rigid anti-seepage layer 18. The optical fiber sensor 20 is used in conjunction with an external data acquisition device 19 to set an alarm threshold and monitor the leakage point in real time. When external water seeps into the dam body 2, it will pass through the three layers of anti-seepage effect of the flexible anti-seepage layer 17, the self-repairing interlayer 17 and the rigid anti-seepage layer 18. When the water reaches the rigid anti-seepage layer 18, the optical fiber sensor 20 will monitor the water flow changes in real time. The data acquisition device 19 receives the optical fiber signal and demodulates it into data and alarms to realize the monitoring function. As time goes by, the water flowing into the drainage chamber 3 may carry sediment. When the sediment accumulates to a certain extent and needs to be cleaned, the control valve 12 at one end of the sediment discharge pipe 11 is opened. Since the bottom of the inner wall of the drainage chamber 3 is funnel-shaped, the sediment will gather to the bottom under the action of gravity. The dam body 2 is discharged along the sand discharge pipe 11, effectively avoiding the accumulation of silt in the drainage cavity 3, preventing the drainage system from being blocked, and ensuring the continuous stability of the drainage function. The two symmetrical filter layers 14 inside the dam body 2 play a key filtering role. When external water flow tries to penetrate the dam body 2, the filter layer 14 can block soil particles from entering the dam body 2 with the water flow, allowing only clean water to pass through, preventing the internal structure of the dam body 2 from being damaged by soil loss. At the same time, the anti-seepage membrane 15 located on the opposite side of the two anti-seepage layers 14 further prevents water from penetrating, forming a double anti-seepage guarantee, greatly enhancing the anti-seepage performance of the dam body 2, ensuring the stability of the dam body 2 structure, and reducing the risk of leakage. The design of the sand discharge pipe 11 and the bottom of the funnel-shaped drainage cavity 3 solves the problem of silt accumulation from the root. Regularly cleaning silt can ensure that the drainage system is unobstructed for a long time. The double-layer anti-seepage barrier can not only effectively prevent leakage of the dam body 2, but also reduce water waste.

[0043] When there is accumulated water around the dam body 2 that needs to be drained, the waterproof motor 61 is started, and the waterproof motor 61 drives the worm 62 to rotate. Since the worm 62 is meshed with the worm wheel 64, the rotational motion of the worm 62 is converted into the rotation of the worm wheel 64, and the worm wheel 64 is fixedly connected to the upper end of the drain cylinder 5 through the bearing 63, so that the drain cylinder 5 rotates on the inner wall of the rotary joint 8. The external accumulated water can enter the drainage cavity 3 through the drain cylinder 5, and then converge through the connecting pipe 7, and finally be discharged from the dam body 2 through the drainage pipes 9 at both ends. In this process, the flow valve 10 can adjust the drainage volume according to the actual drainage needs, accurately control the drainage speed, and ensure that the water level around the dam body 2 is maintained in a safe range. When the drain cylinder 5 rotates, under the action of centrifugal force , so that the mud and sand adhering to the surface of the drainage barrel 5 are thrown out to avoid clogging the water inlet hole on the surface of the drainage barrel 5. The setting of the rotary joint 8 not only ensures that the drainage barrel 5 can rotate flexibly, but also maintains the sealed connection between the connecting pipe 7 and the drainage barrel 5 to prevent water leakage, making the entire drainage process smooth and efficient. By setting a driving mechanism 6, the drainage barrel 5 is driven to rotate to drain water, and with the adjustable flow valve, it can quickly and accurately remove the accumulated water around the dam body, effectively reduce the water pressure around the dam body 2, reduce the lateral pressure on the dam body 2, and improve the stability of the dam body 2. When the drainage barrel 5 rotates, it realizes self-cleaning under the action of centrifugal force, avoids clogging of the water inlet hole on the drainage barrel 5, improves drainage efficiency, and avoids increase in water pressure in the dam body 2.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The dam structure of the earth-rock cofferdam back slope type anti-seepage dam includes a foundation (1), characterized by: A dam body (2) is installed on the upper side of the foundation (1), a drainage cavity (3) is opened inside the dam body (2), the inner wall of the drainage cavity (3) is fixedly connected to a mounting plate (4), a plurality of drainage cylinders (5) are rotatably fitted on the mounting plate (4), a driving mechanism (6) that matches the drainage cylinders (5) is provided inside the drainage cavity (3), a connecting pipe (7) is installed on the inner wall of the drainage cavity (3), a plurality of rotary joints (8) are installed on the connecting pipe (7), the drainage cylinders (5) are rotatably fitted on the inner wall of the rotary joint (8), the two ends of the connecting pipe (7) are respectively fixedly connected to drainage pipes (9), and a flow valve (10) is installed on the drainage pipe (9); A flexible anti-seepage layer (16) is provided on the side wall of the dam body (2), a rigid anti-seepage layer (18) parallel to the flexible anti-seepage layer (16) is provided on the inner wall of the dam body (2), and a self-repairing interlayer (17) is provided at the interlayer between the flexible anti-seepage layer (16) and the rigid anti-seepage layer (18).

2. The dam body structure of the earth-rock cofferdam back slope type anti-seepage dam according to claim 1 is characterized in that: The driving mechanism (6) comprises a waterproof motor (61) fixedly connected to one side of the inner wall of the drainage cavity (3); the output end of the waterproof motor (61) is fixedly connected to a worm (62); a plurality of bearings (63) are rotatably engaged on the upper side of the inner wall of the drainage cavity (3); and a worm gear (64) is mounted on the bearings (63).

3. The dam body structure of the earth-rock cofferdam back slope type anti-seepage dam according to claim 2 is characterized in that: One end of the worm (64) is rotatably engaged with one side of the inner wall of the drainage chamber (3), the worm (62) is meshed with the worm wheel (64), and the lower end of the bearing (63) is fixedly connected to the upper end of the drainage cylinder (5).

4. The dam body structure of the earth-rock cofferdam back slope type anti-seepage dam according to claim 1 is characterized in that: A sand discharge pipe (11) is fixedly connected to one side of the drainage chamber (5), a control valve (12) is installed at one end of the sand discharge pipe (11), and the other end of the sand discharge pipe (11) extends to the inner wall of the drainage chamber (3).

5. The dam body structure of the earth-rock cofferdam back slope type anti-seepage dam according to claim 1 is characterized in that: The upper side of the dam body (2) is fixedly connected to a wave-breaking wall (13), and the bottom of the inner wall of the drainage cavity (3) is funnel-shaped.

6. The dam body structure of the earth-rock cofferdam back slope type anti-seepage dam according to claim 1, characterized in that: Two reverse filter layers (14) are symmetrically arranged inside the dam body (2), and an anti-seepage membrane (15) is arranged on opposite sides of the two reverse filter layers (14).

7. The dam body structure of the earth-rock cofferdam back slope type anti-seepage dam according to claim 1, characterized in that: The flexible anti-seepage layer (16) is a rubber asphalt composite material with a thickness of 0.5 to 2.0 mm. The rigid anti-seepage layer (18) is a plastic concrete anti-seepage wall with a permeability coefficient of ≤1×10 -7 cm / s, the self-repairing interlayer (17) is a polymer water-absorbing resin layer, and its volume expansion rate after contacting water is ≥200%, an optical fiber sensor (20) is pre-buried in the rigid anti-seepage layer (18), a data acquisition device (19) is provided on the top of the dam body (2), the optical fiber sensor (20) is connected to the data acquisition device (19), and the optical fiber sensor (20) is arranged at a spacing of 0.5 to 1.0 m.

8. A method for constructing a dam body structure of an earth-rock cofferdam back-slope type anti-seepage dam, comprising the dam body structure of an earth-rock cofferdam back-slope type anti-seepage dam according to claims 1 to 7, characterized in that: The specific steps are as follows: S1: Fiber optic sensors are embedded in the rigid anti-seepage layer. The fiber optic sensors are used in conjunction with an external data acquisition device to set alarm thresholds and monitor leakage points in real time. When external water seeps into the dam body, it will pass through the three layers of anti-seepage action of the flexible anti-seepage layer, the self-repairing interlayer and the rigid anti-seepage layer. When the water reaches the rigid anti-seepage layer, the fiber optic sensor will monitor the water flow changes in real time. The data acquisition device receives the fiber optic signal, demodulates it into data, and issues an alarm to achieve monitoring. S2: The water flowing into the drainage cavity may carry sediment. When the sediment accumulates to a certain level and needs to be cleared, the control valve at one end of the sediment discharge pipe is opened. Since the bottom of the inner wall of the drainage cavity is funnel-shaped, the sediment will gather to the bottom under the action of gravity and be discharged from the dam body through the sediment discharge pipe, effectively preventing sediment from accumulating in the drainage cavity and clogging the drainage system, ensuring the continuous stability of the drainage function. The two symmetrically arranged filter layers inside the dam body play a key filtering role. When external water flows try to penetrate the dam body, the filter layers can prevent soil particles from entering the dam body with the water flow, allowing only clean water to pass through, preventing the internal structure of the dam body from being damaged by soil loss. At the same time, the anti-seepage membranes located on the opposite side of the two anti-seepage layers further prevent water from penetrating, forming a double anti-seepage protection, greatly enhancing the anti-seepage performance of the dam body, ensuring the stability of the dam structure, and reducing the risk of leakage; S3: When there is accumulated water around the dam body that needs to be drained, start the waterproof motor, and the waterproof motor drives the worm to rotate. Since the worm and the worm wheel are meshed, the rotational motion of the worm is converted into the rotation of the worm wheel, and the worm wheel is fixedly connected to the upper end of the drain barrel through a bearing, so that the drain barrel rotates on the inner wall of the rotary joint. The external accumulated water can enter the drainage cavity through the drain barrel, and then converge through the connecting pipe, and finally be discharged from the dam body through the drainage pipes at both ends. In this process, the flow valve can adjust the drainage volume according to the actual drainage needs, accurately control the drainage speed, and ensure that the water level around the dam body is maintained in a safe range. When the drain barrel rotates, under the action of centrifugal force, the mud and sand adhering to the surface of the drain barrel are thrown out to avoid clogging the water inlet hole on the surface of the drain barrel.

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