Seepage Monitoring Equipment for Dam Body Maintenance and Its Seepage Monitoring Method

Abstract

The present invention relates to the field of safety monitoring of water conservancy projects, and particularly to a seepage monitoring device for the maintenance of a dam body and a seepage monitoring method thereof. The device includes a monitoring pipe with a vertical inner cavity, in which a vertically movable floating body is arranged. A swing assembly is arranged inside the monitoring pipe. The swing assembly includes a blocking plate arranged at its end. The blocking plate fits against the inner wall of the monitoring pipe. Corresponding through ports and discharge ports are respectively formed on the blocking plate and the surface of the monitoring pipe. A microswitch is installed on the surface of the monitoring pipe. The microswitch is electrically connected to a monitoring device. The microswitch corresponds to the upper part of the swing assembly. In the present invention, the floating body moves up and down under the action of the seepage water level in the monitoring pipe. With the swing drive of the swing assembly by the up and down movement of the floating body, the water level in the monitoring pipe is reciprocally adjusted between the discharge port and the microswitch. By judging the time taken for the floating body to rise from the position of the discharge port to touch the microswitch, the size of the seepage flow is determined, and the stability of continuous monitoring is relatively high.

Description

Technical Field

[0001] The present invention relates to the field of safety monitoring of water conservancy projects, and particularly to a seepage monitoring device for dam body maintenance and a seepage monitoring method thereof. Background Art

[0002] After the reservoir is built and impounded, under the action of the upstream and downstream water levels, seepage phenomena will occur in both the dam body and the dam foundation. The seepage flow of the dam mainly includes two parts. One part is the water flowing through the dam body to the downstream, and the other part is the water flowing through the dam foundation to the downstream. The weir can only measure the water seeping out to the ground, which contains both the seepage water of the dam body and the seepage water of the dam foundation, and there is also a part that seeps away without passing through the weir, which is called the subsurface flow. Seepage has an important impact on the stability of the dam body and the dam foundation, and the seepage problem must be highly regarded. After the dam is constructed and completed, in order to ensure the safety of the dam and the water storage benefit of the reservoir, seepage monitoring must be carried out to accurately master the regularity of seepage changes inside the dam body and the foundation, such as the seepage intensity, source, flow direction and its changes at various places inside the foundation; whether there is a relatively serious concentrated seepage zone; whether there is a trend change unfavorable to the foundation safety after the dam is impounded, etc., as an important basis for judging the stability degree of the dam and the maintenance and reinforcement measures.

[0003] The existing dam seepage monitoring is carried out by setting up a weir and piezometers, and configuring piezometric sensors to monitor the dam seepage. This monitoring method mainly relies on the piezometric sensors to complete monitoring and signal transmission. The electronic piezometric sensors need to work continuously and for a long time, resulting in a high failure rate and affecting the accurate monitoring of seepage. Summary of the Invention

[0004] The purpose of the present invention is to solve the following problems existing in the prior art: The existing dam seepage monitoring is carried out by setting up a weir and piezometers, and configuring piezometric sensors to monitor the dam seepage. This monitoring method mainly relies on the piezometric sensors to complete monitoring and signal transmission. The electronic piezometric sensors need to work continuously and for a long time, resulting in a high failure rate and affecting the accurate monitoring of seepage.

[0005] To solve the problems existing in the prior art, the present invention provides a seepage monitoring device for dam body maintenance, including a monitoring tube with a vertical inner cavity. A floating body that can move vertically is arranged inside the monitoring tube. A swinging assembly is arranged inside the monitoring tube. The swinging assembly includes a blocking plate arranged at its end. The blocking plate fits the inner wall of the monitoring tube. A corresponding through port and a drain port are respectively opened on the blocking plate and the surface of the monitoring tube. A microswitch is installed on the surface of the monitoring tube. The microswitch is electrically connected to a monitoring device. The microswitch corresponds to the upper part of the swinging assembly. The floating body rises or falls within the height range of the swinging assembly under the action of the water level inside the monitoring tube, pushing the swinging assembly to swing left and right, aligning the through port and the drain port for drainage or misaligning them for water storage, and used to monitor the time when the floating body floats from the bottom of the swinging assembly to touch the microswitch to judge the seepage flow rate.

[0006] Preferably, the swing assembly includes a swing frame. The middle of the swing frame is rotatably connected to the inner wall of the monitoring pipe. A torsion handle is fixed at the rotating part of the swing frame. The torsion handle is connected to the inner wall of the monitoring pipe through a spring. When the torsion handle is in a vertical state, the spring is stretched the most. The plug plate is fixed at the bottom of the swing frame. Touch rods are fixed on the top surface of the swing frame and the surface of the plug plate. The top and bottom of the floating body have inclined surfaces for pushing the touch rods to deflect. When the floating body rises to the top under the action of the water level, the inclined surface at the top of the floating body squeezes the touch rod at the top to move to one side, causing the swing frame to swing sideways against the elastic force and the plug plate at the bottom to swing in the opposite direction. The drain port is aligned with the through port, and the water in the monitoring pipe is discharged, causing the water level and the floating body to drop to the position of the drain port. The inclined surface at the bottom of the floating body squeezes the lower touch rod to swing the plug plate back to its original position, and the drain port is misaligned with the through port to stop draining, realizing the continuous intermittent lifting and lowering of the water level and the floating body.

[0007] Preferably, the inclined surfaces at the top and bottom of the floating body push the touch rods to deflect in the same direction, so that the lifting and lowering of the floating body can push the touch rods to drive the swing frame to swing back and forth in both directions.

[0008] Preferably, rollers are evenly rotatably arranged on the surface of the touch rod. The touch rod contacts the inclined surface of the floating body through the rollers, reducing the contact friction between the touch rod and the floating body and enabling the touch rod to stably push the swing frame to swing.

[0009] Preferably, the monitoring device includes an audible and visual alarm. The microswitch is connected in series with a closing device. The audible and visual alarm, the microswitch, the closing device and the external circuit are connected in series. When the closing device is closed, the floating body touches the microswitch to make the audible and visual alarm emit a warning signal.

[0010] Preferably, the closing device includes a sealing box encapsulated outside the drain port. A water-blocking assembly is vertically and slidably fitted in the sealing box. The water-blocking assembly has a leak groove for draining water downward. The water-blocking assembly is connected to the sealing box through a spring. A partition is sealed on the top of the sealing box. Oppositely positioned electrode plates are arranged on the surface of the partition. A conductor plate is fixed on the top of the water-blocking assembly. The oppositely positioned electrode plates are respectively connected to the microswitch and the external circuit. When the water-blocking assembly moves up or down, the conductor plate is disconnected or in contact with the electrode plate, used to disconnect or connect the circuit of the audible and visual alarm. The water flow in the monitoring pipe is introduced into the sealing box through the drain port. The water pressure is above the water-blocking assembly, causing the water-blocking assembly to move downward against the spring force. The conductor plate moves downward to contact the corresponding electrode plate, and the alarm circuit is connected. If the floating body touches the microswitch at this time, the audible and visual alarm is triggered to alarm. And the water-blocking assembly continues to drain water downward. When the water is completely drained downward, the water-blocking assembly resets, and the connection between the conductor plate and the electrode plate is interrupted. The time for the water-blocking assembly to drain water downward is the detection period. The amount of water introduced above the water-blocking assembly through each drain port is the same. If the floating body triggers the microswitch during the detection period, it indicates that the seepage flow rate is large. The floating body is in a safe period outside the detection period. At this time, the microswitch circuit is disconnected and will not be touched to alarm.

[0011] Preferably, the water blocking assembly includes a blocking body which is in sliding contact with the inner wall of the sealed box. The blocking body is located below the drain opening. The blocking body is connected with a vertical cylinder. The bottom opening of the vertical cylinder penetrates through the bottom of the blocking body. The leakage groove is formed on the surface of the vertical cylinder and penetrates through the inside of the vertical cylinder. The leakage groove is used to conduct the water above the blocking body to the lower part of the blocking body. A drainage pipe is connected to the bottom of the sealed box. The top of the vertical cylinder slidably penetrates through the partition board. The conductor piece is fixed at the top of the vertical cylinder. The blocking body divides the sealed box into upper and lower parts. The water discharged from the drain opening is located in the upper part, and its weight presses on the surface of the blocking body, causing it to overcome the elastic force and descend. The vertical cylinder drives the conductor piece to descend with it, so that the conductor piece is closed and connected to the electrode piece. The water in the upper part is introduced into the lower part of the blocking body through the leakage groove, causing the weight of the blocking body to gradually decrease until the water is drained completely. Then the blocking body resets, causing the conductor piece and the electrode piece to disconnect. The water conducted downward is discharged downstream through the drainage pipe.

[0012] Preferably, the leakage groove is a strip-shaped opening with a uniform width. An external thread is provided on the outer wall of the vertical cylinder at the position of the leakage groove. A threaded cylinder is threadedly connected to the external thread part of the vertical cylinder. By rotating the threaded cylinder to move up and down, the blocking area of the threaded cylinder on the leakage groove is adjusted to change the drainage efficiency of the leakage groove and the length of the detection time, and it is adjusted according to different dam conditions.

[0013] A seepage monitoring method for the seepage monitoring device for dam body maintenance based on the above is as follows:

[0014] A. Vertically insert the monitoring pipe into the dam body of the dam. The seepage in the dam body enters the monitoring pipe from the bottom, forming a certain high water level inside the monitoring pipe. Set the swinging assembly and the floating body below the normal water level of the monitoring pipe. The floating body moves vertically following the water level of the monitoring pipe.

[0015] B. The position of the drain opening is the starting line of the water level, and the position of the micro switch is the water level monitoring line. In the initial state, the water level is at the starting line. The seepage in the dam body fills the monitoring pipe, causing the water level to rise. The floating body rises to the monitoring line position under the action of the water level. The floating body touches the micro switch, and the time length of the floating body from the starting line to the monitoring line is monitored through the micro switch to judge the seepage flow rate.

[0016] C. Touching the micro switch at a certain time interval will cause the detection device to give an alarm signal. When the seepage is fast, the time for touching the micro switch is short, and the detection device will give an alarm signal. When the seepage is slow, the time for touching the micro switch is long, and the detection device goes into sleep mode. Therefore, a time line of the detection device's alarm and sleep mode is formed. This time line is the safety limit. Referring to different dam conditions, a corresponding safety limit is preset.

[0017] D. When the float touches the micro switch, it squeezes the swing assembly to swing, and the port is aligned with the outlet to discharge the water in the monitoring tube, so that the water level returns to the starting line. The float also drops to the starting line, and the float squeezes the swing assembly to reset. The port and the outlet are misaligned to stop drainage, and water is stored in the monitoring tube for monitoring again, realizing continuous and uninterrupted seepage monitoring.

[0018] Compared with the related art, the seepage monitoring device and the seepage monitoring method for dam body maintenance provided by the present invention have the following beneficial effects:

[0019] 1. The present invention uses the floating body to move up and down under the action of the seepage water level in the monitoring pipe, and cooperates with the floating body to swing the swing assembly, so that the water level in the monitoring pipe is reciprocated between the discharge port and the micro switch. The amount of seepage is judged by the time it takes for the floating body to rise from the discharge port to touch the micro switch, and the stability of continuous monitoring is relatively high;

[0020] 2. The present invention uses a fixed amount of water discharged from the monitoring tube to act on the water retaining component, causing the water retaining component to move downward to control the alarm circuit to close. The time it takes for the water to be completely discharged downward by the water retaining component forms the detection moment. During this period, the micro switch is touched to alarm, and it is determined that the seepage is large. Beyond this period, it is a safety moment and the alarm will not be triggered. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is one of the overall structural schematic diagrams of the present invention;

[0022] Figure 2 This is the second schematic diagram of the overall structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the distribution structure of the floating body in the monitoring tube of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the swing assembly of the present invention;

[0025] Figure 5 It is a schematic diagram of the touch control structure of the float and the micro switch of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the closing device of the present invention;

[0027] Figure 7 It is a schematic diagram of the blocking structure of the threaded barrel to the leakage groove of the present invention.

[0028] Reference numerals in the figures: 1, monitoring tube; 2, floating body; 3, microswitch; 4, swinging assembly; 41, swing frame; 42, plug plate; 43, through port; 44, torsion handle; 45, contact rod; 5, closing device; 51, water blocking assembly; 511, blocking body; 512, vertical cylinder; 513, threaded cylinder; 514, leakage groove; 52, sealing box; 53, electrode plate; 54, conductor plate; 6, audible and visual alarm; 7, drain port. Specific implementation mode

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] The following describes in detail the specific implementation of the present invention with reference to specific embodiments.

[0031] Embodiment 1

[0032] As Figures 1-5 shown, the seepage monitoring device for the maintenance of the dam body includes a monitoring tube 1. The monitoring tube 1 has a vertically oriented inner cavity. The top and bottom of the monitoring tube 1 are through. A rainproof top cover is provided at its top, and a multi-layer permeable filter plate is provided at the bottom. A square floating body 2 is arranged in the monitoring tube 1 with a clearance fit. A vertically movable floating body 2 is arranged in the monitoring tube 1;

[0033] A swinging assembly 4 is arranged inside the monitoring tube 1. The swinging assembly 4 includes a swing frame 41. The middle part of the swing frame 41 is rotatably connected to the inner wall of the monitoring tube 1. A torsion handle 44 is fixedly connected to the rotating shaft of the swing frame 41. A spring is connected to the upper part of the rotating part of the swing frame 41. The bottom end of the spring is connected to the torsion handle 44. The spring is stretched the most when the torsion handle 44 is in a vertical state. A plug plate 42 is fixed to the bottom of the swing frame 41. The plug plate 42 is in contact with the inner wall of the monitoring tube 1. Opposite through ports 43 and drain ports 7 are respectively provided on the plug plate 42 and the surface of the monitoring tube 1. Two parallel contact rods 45 are fixed to the top of the swing frame 41 and the surface of the plug plate 42. The top and bottom of the floating body 2 are beveled. The two end bevels of the floating body 2 are used to push the contact rods 45 to tilt to the same side;

[0034] A microswitch 3 is installed on the side of the monitoring tube 1 away from the swing frame 41. The contact of the microswitch 3 penetrates into the monitoring tube 1 and is wrapped with a waterproof film. A protrusion corresponding to the contact of the microswitch 3 is provided on the side surface of the floating body 2. When the floating body 2 squeezes the upper contact rod 45, it touches the microswitch 3 at the same time. The microswitch 3 is electrically connected to the monitoring device;

[0035] The monitoring tube 1 is vertically inserted into the dam body. The seepage in the dam body enters the monitoring tube 1 through filtration from the bottom, forming a certain high water level inside the monitoring tube 1. The position of the outlet 7 is the water level starting line, and the position of the micro switch 3 is the water level monitoring line. In the initial state, the water level is at the starting line. The seepage in the dam body is poured into the monitoring tube 1 to raise the water level. The float 2 rises to the monitoring line under the action of the water level. The float 2 touches the micro switch 3, and the time for the float 2 to move from the starting line to the monitoring line is monitored by the micro switch 3. To judge the amount of seepage, the float 2 rises to the top due to the water level, and the inclined surface on the top of the float 2 squeezes the top feeler rod 45 to move to one side, causing the swing frame 41 to overcome the elastic force and swing to the side, while the bottom plugging plate 42 swings in the opposite direction, and the discharge port 7 is aligned with the through port 43 to discharge the water in the monitoring tube 1, so that the water level and the float 2 drop to the position of the discharge port 7, and the inclined surface on the bottom of the float 2 squeezes the lower feeler rod 45 to make the plugging plate 42 swing back to its original position, and the discharge port 7 and the through port 43 are misaligned to stop drainage, thereby realizing continuous seepage monitoring.

[0036] The surface of the feeler rod 45 is evenly rotated with multiple rollers installed, and the feeler rod 45 contacts the inclined surface of the float 2 through the rollers, thereby reducing the contact friction between the feeler rod 45 and the float 2, so that the feeler rod 45 can stably push the swing frame 41 to swing.

[0037] Embodiment 2

[0038] like Figures 1-6 As shown, the monitoring device includes an audible and visual alarm 6, a closing device 5 includes a sealed box 52 encapsulated outside the discharge port 7, a water retaining assembly 51 is in sliding contact with the inner wall of the sealed box 52, and the sealed box 52 is divided into two parts, the water retaining assembly 51 has a drain groove 514 for downward drainage, the water retaining assembly 51 is located below the discharge port 7, a spring is used to connect the bottom of the water retaining assembly 51 to the sealed box 52, the top of the sealed box 52 is divided into a closed power connection space by a partition, and aligned electrode sheets 53 are arranged on the surface of the partition, and conductive conductor sheets 54 are arranged between the electrode sheets 53, and the conductor sheets 54 are fixedly connected to the top of the water retaining assembly 51, and the aligned electrode sheets 53 are respectively connected to the micro switch 3 and the external circuit, so that the audible and visual alarm 6 and the micro switch 3 are connected in series with the external circuit;

[0039] The water flow in the monitoring pipe 1 is introduced into the sealed box 52 through the drain port 7. The water pressure is above the water blocking component 51, causing the water blocking component 51 to move downward against the spring force. The conductor sheet 54 moves downward to contact the corresponding electrode sheet 53, and the alarm circuit is connected. If the floating body 2 touches the microswitch 3 at this time, the sound and light alarm 6 will be triggered to alarm. The water blocking component 51 continues to drain water downward. When the water is completely drained downward, the water blocking component 51 resets, and the connection between the conductor sheet 54 and the electrode sheet 53 is interrupted. The time for the water blocking component 51 to drain water downward is the detection period. The amount of water introduced above the water blocking component 51 through the drain port 7 each time is the same. If the floating body 2 triggers the microswitch 3 during the detection period, it indicates a large seepage flow rate. The floating body 2 is in the safe period outside the detection period. At this time, the microswitch 3 circuit is disconnected and will not be touched to alarm.

[0040] As Figures 6-7 shown, the water blocking component 51 includes a baffle 511. The baffle 511 is in sliding contact with the inner wall of the sealed box 52. The baffle 511 is located below the drain port 7. The vertical cylinder 512 is fixed to the baffle 511, and the bottom opening of the vertical cylinder 512 penetrates through the lower part of the baffle 511. The leakage groove 514 is opened on the surface of the vertical cylinder 512 and penetrates through the inside of the vertical cylinder 512. The leakage groove 514 is used to conduct the water above the baffle 511 to below the baffle 511. A drainage pipe is connected to the bottom of the sealed box 52. The top of the vertical cylinder 512 slides through the partition and is fixedly connected to the conductor sheet 54;

[0041] The baffle 511 divides the sealed box 52 into upper and lower parts. The water discharged from the drain port 7 is located in the upper part, and the weight presses on the surface of the baffle 511, causing it to descend against the elastic force. The vertical cylinder 512 drives the conductor sheet 54 to descend with it, causing the conductor sheet 54 to be closed and connected to the electrode sheet 53. The water in the upper part is introduced into the lower part of the baffle 511 through the leakage groove 514, causing the weight of the baffle 511 to gradually decrease until the water is drained completely. The baffle 511 resets to interrupt the connection between the conductor sheet 54 and the electrode sheet 53. The water conducted downward is discharged downstream through the drainage pipe.

[0042] As Figure 7 shown, the leakage groove 514 is a strip-shaped opening with a uniform width. The outer wall of the vertical cylinder 512 is provided with an external thread at the position of the leakage groove 514. A threaded cylinder 513 is threadedly connected to the external thread part of the vertical cylinder 512. By rotating the threaded cylinder 513 to move up and down, the blocking area of the threaded cylinder 513 on the leakage groove 514 is adjusted to change the drainage efficiency of the leakage groove 514 and the length of the detection time, and it is adjusted according to different dam conditions.

[0043] A seepage monitoring method for the seepage monitoring device for dam body maintenance based on the above, the specific method is as follows:

[0044] A. Vertically insert the monitoring tube 1 into the dam body of the water dam. The seepage flow in the dam body enters the monitoring tube 1 from the bottom, forming a certain water level inside the monitoring tube 1. Set the swing assembly 4 and the floating body 2 below the normal water level of the monitoring tube 1, and the floating body 2 moves vertically following the water level of the monitoring tube 1.

[0045] B. The position of the drain opening 7 is the starting line of the water level, and the position of the microswitch 3 is the water level monitoring line. In the initial state, the water level is at the starting line. The seepage flow in the dam body fills the monitoring tube 1, causing the water level to rise. The floating body 2 rises under the action of the water level to the monitoring line position. The floating body 2 touches the microswitch 3, and the microswitch 3 monitors the length of time for the floating body 2 to move from the starting line to the monitoring line to judge the seepage flow rate.

[0046] C. Touching the microswitch 3 at certain time intervals will cause the detection device to give an alarm signal. When the seepage flow is fast, the time for touching the microswitch 3 is short, and the detection device will give an alarm signal. When the seepage flow is slow, the time for touching the microswitch 3 is long, and the detection device goes into sleep mode. Thus, a time line of the detection device's alarm and sleep mode is formed. This time line is the safety limit, and corresponding safety limits are preset according to different dam conditions.

[0047] D. When the floating body 2 touches the microswitch 3, it will squeeze the swing assembly 4 to swing. The through port 43 aligns with the drain opening 7 to drain the water in the monitoring tube 1, causing the water level to return to the starting line. The floating body 2 also drops to the starting line. The floating body 2 squeezes the swing assembly 4 to swing back to its original position, and the through port 43 is misaligned with the drain opening 7 to stop draining. The monitoring tube 1 is filled with water again for monitoring, realizing continuous and uninterrupted seepage flow monitoring.

Claims

1. Seepage monitoring equipment for the maintenance of a dam body, comprising a monitoring pipe (1) with a vertical inner cavity, wherein a floating body (2) that can move vertically is arranged in the monitoring pipe (1), and is characterized in that, Inside the monitoring pipe (1), a swinging component (4) is provided. The swinging component (4) includes a blocking plate (42) arranged at its end. The blocking plate (42) fits against the inner wall of the monitoring pipe (1). Alignment ports (43) and drain ports (7) are respectively provided on the blocking plate (42) and the surface of the monitoring pipe (1). A microswitch (3) is installed on the surface of the monitoring pipe (1). The microswitch (3) is electrically connected to a monitoring device. The microswitch (3) corresponds to the upper part of the swinging component (4). The floating body (2) rises or falls within the height range of the swinging component (4) under the action of the water level inside the monitoring pipe (1), pushing the swinging component (4) to swing left and right, aligning the alignment port (43) with the drain port (7) for drainage or misaligning for water storage, and used to monitor the time when the floating body (2) floats from the bottom of the swinging component (4) to touch the microswitch (3) to judge the seepage flow rate; The swinging component (4) includes a swing frame (41). The middle part of the swing frame (41) is rotatably connected to the inner wall of the monitoring pipe (1). A torsion handle (44) is fixed at the rotating part of the swing frame (41). The torsion handle (44) is connected to the inner wall of the monitoring pipe (1) through a spring. The torsion handle (44) stretches the spring the most when in a vertical state. The blocking plate (42) is fixed at the bottom of the swing frame (41). Touch rods (45) are fixed on the top of the swing frame (41) and the surface of the blocking plate (42). The top and bottom of the floating body (2) have inclined surfaces for pushing the touch rod (45) to deflect; The inclined surfaces at the top and bottom of the floating body (2) push the touch rod (45) to deflect in the same direction.

2. The seepage monitoring device for the maintenance of the dam body according to claim 1, characterized in that, Rollers are evenly rotatably arranged on the surface of the touch rod (45). The touch rod (45) contacts the inclined surface of the floating body (2) through the rollers.

3. The seepage monitoring device for the maintenance of the dam body according to claim 1, characterized in that, The monitoring device includes an audible and visual alarm (6). The microswitch (3) is connected in series with a closing device (5). The audible and visual alarm (6), the microswitch (3), the closing device (5) are connected in series with an external circuit.

4. The seepage monitoring device for the maintenance of the dam body according to claim 3, characterized in that, The closing device includes a sealing box (52) encapsulated outside the drain port (7). A water blocking component (51) is vertically and slidably fitted inside the sealing box (52). The water blocking component (51) has a leakage groove (514) for downward drainage. The water blocking component (51) is connected to the sealing box (52) through a spring. A partition is sealed at the top of the sealing box (52). Alignment electrode plates (53) are arranged on the surface of the partition. A conductor plate (54) is fixed at the top of the water blocking component (51). The alignment electrode plates (53) are respectively connected to the microswitch (3) and the external circuit. The water blocking component (51) moves up or down, causing the conductor plate (54) to disconnect or contact the electrode plate (53), for disconnecting or connecting the circuit of the audible and visual alarm (6).

5. The seepage monitoring device for the maintenance of the dam body according to claim 4, characterized in that, The water retaining assembly (51) includes a retaining body (511). The retaining body (511) is in sliding contact with the inner wall of the sealing box (52). The retaining body (511) is located below the discharge port (7). The retaining body (511) is connected to a vertical cylinder (512). The bottom opening of the vertical cylinder (512) penetrates the bottom of the retaining body (511). A leakage groove (514) is formed on the surface of the vertical cylinder (512) and penetrates the interior of the vertical cylinder (512). The leakage groove (514) is used to conduct the water above the retaining body (511) to below the retaining body (511). A drainage pipe is connected to the bottom of the sealing box (52). The top of the vertical cylinder (512) slidably penetrates the partition board. The conductor sheet (54) is fixed to the top of the vertical cylinder (512).

6. The seepage monitoring device for the maintenance of the dam body according to claim 5, characterized in that, The leakage groove (514) is a strip-shaped opening with a uniform width. An external thread is provided on the outer wall of the vertical cylinder (512) at the position of the leakage groove (514). A threaded cylinder (513) is threadedly connected to the external thread part of the vertical cylinder (512).

7. A seepage monitoring method for the seepage monitoring equipment used in the maintenance of the dam body according to any one of claims 1-6, characterized in that, The specific method is as follows: A. Vertically insert the monitoring pipe (1) into the dam body of the dam. The seepage in the dam body enters the monitoring pipe (1) from the bottom, forming a certain water level inside the monitoring pipe (1). The swing assembly (4) and the floating body (2) are arranged below the normal water level of the monitoring pipe (1). The floating body (2) moves vertically following the water level of the monitoring pipe (1). B. The position of the discharge port (7) is the water level starting line, and the position of the microswitch (3) is the water level monitoring line. In the initial state, the water level is at the starting line. The seepage in the dam body fills the monitoring pipe (1), causing the water level to rise. The floating body (2) rises to the monitoring line position under the action of the water level. The floating body (2) touches the microswitch (3). By monitoring the length of time of the floating body (2) from the starting line to the monitoring line through the microswitch (3), the seepage flow rate can be judged. C. Touching the microswitch (3) at certain time intervals will cause the detection device to give an alarm signal. When the seepage is fast, the time for touching the microswitch (3) is short, and the detection device will give an alarm signal. When the seepage is slow, the time for touching the microswitch (3) is long, and the detection device goes into sleep. Therefore, a time line of the detection device's alarm and sleep is formed. This time line is the safety limit. Referring to different dam body conditions, corresponding safety limits are preset. D. When the floating body (2) touches the microswitch (3), it will squeeze the swing assembly (4) to swing. The through port (43) is aligned with the discharge port (7) to drain the water in the monitoring pipe (1), causing the water level to return to the starting line. The floating body (2) also drops to the starting line. The floating body (2) squeezes the swing assembly (4) to swing back to its original position. The through port (43) is misaligned with the discharge port (7) to stop draining. The monitoring pipe (1) is filled with water again for monitoring, realizing continuous and uninterrupted seepage monitoring.

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