Earth and rockfill dam water level monitoring device and construction method

Abstract

The invention discloses an earth and rockfill dam water level monitoring device and a construction method, and belongs to the technical field of water level monitoring. The earth and rockfill dam water level monitoring device comprises a stand column and further comprises a detection box, a water level sensor, a water level sensor, a water level sensor and a water level sensor, the detection box vertically slides on the stand column, and a water inlet part is arranged outside the detection box; the sleeve is fixedly arranged on the inner wall of the detection box and is in sliding connection with the stand column, and a positioning assembly is arranged between the sleeve and the stand column; the mounting plate is connected with the top of the sleeve through a connecting rod, the mounting plate is further connected with a water level measuring instrument through a supporting plate, the water level measuring instrument is used for measuring the water level in the detection box, and a GPS positioning module is arranged in the water level measuring instrument; the floating body is arranged on the outer side of the stand column in a sleeving mode, and a first elastic element is arranged between the floating body and the bottom of the detection box; through mechanical linkage and fluid optimization design, the problems of blind areas, water immersion, turbulent flow interference and the like in traditional water level monitoring are solved, self-adaptive and high-precision monitoring of the water level of the earth and rockfill dam is achieved, and the system is suitable for the scene of rainstorm or violent water level fluctuation.

Description

TECHNICAL FIELD

[0001] The present application relates to the water level monitoring technical field, especially to a soil and rock dam water level monitoring device and construction method. BACKGROUND

[0002] The soil and rock dam refers to the dam that is built by the local soil, stone or mixed material through the methods such as throwing filling and rolling pressing. When the dam body material is mainly soil and gravel, it is called soil dam, when it is mainly stone, pebble and blasting stone material, it is called rockfill dam, and when both types of local materials account for a considerable proportion, it is called soil and rock mixed dam. During the period of abundant rainfall or sudden heavy rain, the water level intercepted by the soil and rock dam will rise, which will cause a certain degree of influence on the soil and rock dam, and even lead to the damage of the soil and rock dam. Therefore, it is necessary to detect the safety of the water level of the soil and rock dam. The existing water level is generally monitored by setting a measuring instrument on the water surface. However, if the water level rises beyond the position of the measuring instrument, the measuring instrument will be soaked in the water body and damaged. If the initial position of the measuring instrument is set too high, the non-contact equipment (such as radar and ultrasonic water level meter) will have a measurement blind area, and the installation of the measuring instrument is too high to cover the near water surface area. At the same time, the setting of the measuring instrument is easy to be affected by the greater wind resistance to make the rod body inclined, which affects the measurement result. SUMMARY

[0003] The present application aims at solving the problems in the prior art and provides a soil and rock dam water level monitoring device and construction method.

[0004] To solve the above technical problems, the present application adopts the following technical scheme: A soil and rock dam water level monitoring device, comprising a stand column, further comprising: a detection box vertically sliding on the stand column, wherein the detection box is externally provided with a water inlet part; a sleeve pipe fixedly arranged on the inner wall of the detection box and connected with the stand column in sliding mode, wherein a positioning assembly is arranged between the sleeve pipe and the stand column; an installation plate connected with the top of the sleeve pipe through a connecting rod, wherein the installation plate is further connected with a water level measuring instrument for measuring the water level in the detection box through a supporting plate, and the water level measuring instrument is internally provided with a GPS positioning module; and a floating body sleeved on the outer side of the stand column, and a first elastic element is arranged between the floating body and the bottom of the detection box.

[0005] Preferably, the water inlet part comprises a connecting shell communicated with the detection box, a circular plate fixedly arranged at the end of the connecting shell away from the detection box, and a filter screen cylinder rotatably connected with the circular plate, and a water retaining structure is arranged in the connecting shell.

[0006] Preferably, the filter screen barrel is provided with uniformly distributed water filtering holes on the arc surface, and the filter screen barrel is provided with a plurality of circumferentially uniformly distributed push pieces on the arc surface.

[0007] Preferably, the water suppression structure comprises an elastic telescopic rod fixed in the connecting shell and a water suppression frame provided at the end of the elastic telescopic rod away from the inner wall of the connecting shell, and the water suppression frame is slidingly connected in the connecting shell.

[0008] Preferably, the water suppression frame comprises water suppression plates arranged in the connecting shell from left to right, and cavity assembly and second elastic elements arranged between adjacent two water suppression plates, the water suppression plates are provided with recessed holes for water to pass through, and the recessed holes on adjacent two water suppression plates are arranged alternately, and the water suppression plates are slidingly connected in the connecting shell.

[0009] Preferably, the cavity assembly comprises a first movable plate and a second movable plate hingedly connected to each other, the first movable plate is hingedly connected to one of the adjacent water suppression plates, and the second movable plate is hingedly connected to the other of the adjacent water suppression plates.

[0010] Preferably, the positioning assembly comprises a sliding pipe arranged outside the sleeve pipe, a positioning rod slidingly connected to the sliding pipe and the sleeve pipe, a third elastic element arranged between the positioning rod and the inner wall of the sliding pipe, and a pull rope connected to the positioning rod, the pull rope is provided with a float at the end away from the positioning rod, and the vertical column is provided with a positioning hole matched with the positioning rod.

[0011] Preferably, the positioning rod is provided with an extrusion inclined surface at the lower side of the end away from the float, when the downward pressure of the detection box on the extrusion inclined surface through the sleeve pipe is greater than the elastic force of the third elastic element, the positioning rod slides to the end away from the sleeve pipe under the force.

[0012] Preferably, the water level measuring instrument comprises one or more of an ultrasonic water level meter, a radar water level meter or a laser water level meter, and the top of the detection box is provided with a detection groove matched with the water level measuring instrument.

[0013] The application also discloses a construction method of the soil and rock dam water level monitoring device. S1: initial installation: The vertical column is fixed on the soil and rock dam body to ensure its vertical stability; The detection box is slidingly sleeved on the vertical column through the sleeve pipe, the float is sleeved outside the vertical column, the water level measuring instrument is fixed on the top of the detection box through the mounting plate, and the GPS positioning module is calibrated in position; S2: anti-blocking and flow suppression: The water enters the connecting shell through the water filtering holes of the filter screen barrel, and the impurities are intercepted outside the filter screen barrel. The water suppression frame slows down the water flow impact by the staggered water suppression plate and the cavity assembly, changes the turbulent flow into laminar flow, reduces the water surface disturbance in the detection box, and improves the water level measurement accuracy. S3: water level monitoring: Low water level state: the detection box is kept stable by being inserted into the positioning hole of the stand column through the positioning rod, and the water level gauge monitors the water level in the detection box through the detection groove; Water level rising: the float rises with the water level and squeezes the first elastic element; Automatic reset: when the water level in the detection box, i.e. the water level at the earth and rock dam, exceeds the height of the float, the float is lifted by the buoyancy and exerts a pulling force on the positioning rod through the pulling rope, the third elastic element is compressed, the positioning rod is separated from the positioning hole, the detection box is quickly lifted under the elastic force of the first elastic element, until the distance between the detection box and the float returns to the initial distance, at this time the float is not affected by the buoyancy, the third elastic element pushes the positioning rod to re-insert into the positioning hole, and the position locking is completed; Water level falling: the float no longer pushes the detection box upward through the first elastic element, so that the upward pushing force on the detection box is reduced, the resistance between the inclined surface and the inner wall of the positioning hole is squeezed, and the positioning rod is separated from the positioning hole again, and the detection box automatically sinks to the vicinity of the water surface to restore the initial monitoring state.

[0014] From the above technical solution, the present application has the following advantages: 1. In the present application, the height of the water level gauge is automatically adjusted by using the buoyancy, solving the problem that the near-water surface area cannot be covered when the traditional radar / ultrasonic / laser water level meter is installed too high, and the water level gauge is damaged by being submerged when it is installed too low, so that the detection box is always close to the water surface, avoiding the influence of the blind area, and ensuring the service life of the equipment and the accuracy of the monitoring results; 2. In the present application, by setting a filter screen cylinder in the water inlet part, impurities in the water can be filtered and intercepted, avoiding the impurities from entering the detection box and covering the detection water level, which affects the accuracy of the water level measurement result, and by setting a stirring piece outside the filter screen cylinder, the stirring piece drives the filter screen cylinder to rotate when the water flows from the filter screen cylinder, so that the water inlet direction of the original filter screen cylinder becomes the water outlet direction, and the impurities adhered to the filter screen cylinder are impacted and separated, without affecting the normal passage of the water flow, reducing the influence of the filter screen cylinder blockage on the measurement result; 3. In the present application, the water inlet direction of the connecting shell is vertically arranged with the water inlet direction of the filter screen cylinder, so that the water impact force entering the connecting shell is smaller than the water impact force directly entering the filter screen cylinder, and the water suppression frame in the connecting shell is layered and buffered, reducing the influence of turbulent flow on water level measurement, reducing the water surface disturbance in the detection box, and improving the water level measurement accuracy; 4. In the present application, by setting the positioning assembly sleeve and the stand column, the stability of the water level gauge in measuring the water level in the detection box is improved, avoiding the shaking of the detection box under the action of water and wind, and reducing the measurement error caused by external interference. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram of section A in the middle; Figure 5 This is a schematic diagram of the external structure of the sleeve of the present invention; Figure 6 This is a schematic cross-sectional view of the sleeve structure of the present invention; Figure 7 This is a schematic diagram of the external structure of the mounting plate of the present invention; Figure 8 This is a schematic diagram of the structure of the filter cylinder of the present invention; Figure 9 This is a cross-sectional structural diagram of the detection box of the present invention; Figure 10 This is a schematic diagram of the water-suppressing frame of the present invention; Figure 11 This is a schematic diagram of the cavity assembly of the present invention.

[0016] In the diagram: 1. Column; 2. Detection box; 201. Detection tank; 3. Water inlet; 301. Connecting shell; 302. Circular plate; 303. Filter screen cylinder; 3031. Actuating plate; 4. Sleeve; 5. Mounting plate; 501. Connecting rod; 502. Support plate; 6. Water level measuring instrument; 7. Float; 701. First elastic element; 8. Elastic telescopic rod; 801. Water suppressor; 8011. Water suppressor plate; 8012. Second elastic element; 8013. First movable plate; 8014. Second movable plate; 9. Sliding tube; 901. Positioning rod; 9011. Extrusion slope; 902. Float; 903. Third elastic element; 904. Pull rope; 10. Positioning hole. Detailed Implementation

[0017] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0018] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions: Reference Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 9As shown, the present embodiment proposes a soil and rock dam water level monitoring device, which comprises a column 1 fixed to the dam body, and further comprises a detection box 2, a sleeve 4, a mounting plate 5 and a float 7. The detection box 2 vertically slides on the column 1, and a water inlet part 3 for introducing water is arranged outside the detection box 2. The sleeve 4 is fixed to the inner wall of the detection box 2 and is connected with the column 1 in sliding mode, and a positioning assembly is arranged between the sleeve 4 and the column 1. The mounting plate 5 is connected with the top of the sleeve 4 through a connecting rod 501, and the mounting plate 5 is further connected with a water level measuring instrument 6 for measuring the water level in the detection box 2 through a support plate 502. The water level measuring instrument 6 supports ultrasonic, radar or laser measurement, and has a built-in GPS module for positioning. A detection groove 201 matched with the water level measuring instrument 6 is arranged at the top of the detection box 2. The float 7 is sleeved outside the column 1 and floats with the water level, and a first elastic element 701 is arranged between the float 7 and the bottom of the detection box 2. The detection box 2 is sleeved on the column 1 through the sleeve 4, the float 7 is sleeved outside the column 1, the water level measuring instrument 6 is fixed at the top of the detection box 2 through the mounting plate 5, the GPS positioning module calibrates the position, the float 7 and the first elastic element 701 are connected to realize automatic lifting of the detection box 2, manual intervention is avoided, the mechanical positioning assembly does not need power, and is suitable for long-term monitoring in the field. The GPS positioning module enhances the position tracking capability. The present application automatically adjusts the height of the water level measuring instrument 6 by using buoyancy, solves the problems that the near-water surface area cannot be covered when the traditional radar / ultrasonic / laser water level meter is installed too high, and the water level measuring instrument 6 is damaged by being submerged when it is installed too low, makes the detection box 2 always close to the water surface, avoids the influence of the blind area, and guarantees the service life of the equipment and the accuracy of the monitoring results.

[0019] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8 As a preferred embodiment, on the basis of the above-mentioned mode, further, the water inlet part 3 comprises a connecting shell 301 communicated with the detection box 2. The connecting shell 301 is a hollow shell, one end of which is communicated with the detection box 2, and the other end of which is fixed with a circular plate 302. A water retaining structure is arranged inside the connecting shell 301. The water retaining structure serves as a water flow channel, guides the water filtered by the filter screen cylinder 303 into the detection box 2, and slows down the water flow impact through the water retaining structure. The circular plate 302 is fixed to the end of the connecting shell 301, and is rotatably connected with the filter screen cylinder 303 outside. The circular plate 302 supports the filter screen cylinder 303 and allows it to rotate freely, and simultaneously seals the end of the connecting shell 301 to prevent water leakage. The filter screen cylinder 303 is uniformly distributed with water filtering holes on the surface of the cylinder body, and the outer wall is provided with circumferentially arranged actuating pieces 3031, and the water inlet direction is perpendicular to the connecting shell 301; the filter screen cylinder 303 can intercept impurities in the water body, prevent the detection box 2 from being blocked, and prevent the impurities from entering the detection box 2 and covering the detection water level, thereby affecting the accuracy of the water level measurement result; the flowing water flow can impact the actuating pieces 3031 to drive the filter screen cylinder 303 to rotate, so that the water inlet direction of the original filter screen cylinder 303 becomes a water outlet direction, and the impurities adhered to the filter screen cylinder 303 are impacted and separated, without affecting the normal passing of the water flow, thereby reducing the influence of the filter screen cylinder 303 blockage on the measurement result.

[0020] Referring to Figure 3 , Figure 4 , Figure 10 and Figure 11 , as a preferred embodiment, on the basis of the above-mentioned mode, further, the water suppression structure includes an elastic expansion rod 8 fixed in the connecting shell 301 and a water suppression frame 801 provided at one end of the elastic expansion rod 8 away from the inner wall of the connecting shell 301, the elastic expansion rod 8 is fixed to the inner wall of the connecting shell 301 to provide axial elastic support, allowing the water suppression frame 801 to slide in the connecting shell 301 to adapt to the water flow impact under different flow rates; Further, the water suppression frame 801 includes water suppression plates 8011 arranged in the connecting shell 301 from left to right and second elastic elements 8012 and cavity assembly arranged between adjacent two water suppression plates 8011, the water suppression plates 8011 are provided with recessed holes for water to pass through, the recessed holes on the adjacent two water suppression plates 8011 are staggered, and the water suppression plates 8011 are slidingly connected in the connecting shell 301; Further, the cavity assembly includes a first movable plate 8013 and a second movable plate 8014 hingedly connected to each other, the first movable plate 8013 is hingedly connected to one of the adjacent water suppression plates 8011, and the second movable plate 8014 is hingedly connected to the other of the adjacent water suppression plates 8011; Specifically, the water filtered by the filter screen cylinder 303 enters through the connecting shell 301, the staggered recessed holes of the water suppression plates 8011 divide the water flow into multiple laminar flows, and when the water flow passes through the water suppression frame 801, the cavity assembly expands and contracts with the pressure, prolongs the flow path and consumes kinetic energy, the water suppression plates 8011 are slidingly matched with the inner wall of the connecting shell 301, and the dynamic adjustment is realized through the elastic expansion rod 8 and the second elastic elements 8012, the sliding adjustment distance of the water suppression plates 8011 is adjusted to adapt to different flow rates, and after being divided by multiple water suppression plates 8011, the turbulent flow is gradually converted into stable laminar flow, and finally smoothly enters the detection box 2, thereby significantly improving the anti-interference ability and measurement accuracy of the earth and rockfill dam water level monitoring, and being suitable for flow fluctuation scenes such as heavy rain.

[0021] Referring to Figure 3 , Figure 6 , Figure 7 and Figure 9As shown, as a preferred embodiment, on the basis of the above mode, further, the positioning assembly comprises a sliding pipe 9 arranged outside the sleeve pipe 4, a positioning rod 901 slidingly connected on the sliding pipe 9 and the sleeve pipe 4, a third elastic element 903 arranged between the positioning rod 901 and the inner wall of the sliding pipe 9, and a pull rope 904 connected with the positioning rod 901, the sliding pipe 9 is fixed outside the sleeve pipe 4 and has a hollow tubular structure, and the positioning rod 901 and the third elastic element 903 are accommodated in the sliding pipe 9, the sliding pipe 9 serves as a sliding track of the positioning rod 901 and limits the movement direction of the positioning rod 901, so as to ensure accurate alignment with the positioning hole 10 on the stand 1; the third elastic element 903 provides a reset elastic force for the positioning rod 901, so as to realize locking or releasing of the sleeve pipe 4 and the stand 1; the pull rope 904 passes through the sliding pipe 9 at the end away from the positioning rod 901 and is connected with a float 902, and the stand 1 is provided with the positioning hole 10 matched with the positioning rod 901, the float 902 rises and falls with the water level, and the positioning rod 901 is pulled out of the positioning hole 10 by the pull rope 904. Specifically, in the initial locking state, the positioning rod 901 is stretched out under the elastic force of the third elastic element 903, is inserted into the positioning hole 10 of the stand 1, fixes the position of the sleeve pipe 4, and ensures the stability of the water level measuring instrument 6 in the measuring process. The water level rising triggers unlocking: the water level in the detection box 2 rises and pushes the float 902 to float, the pull rope 904 is pulled to drive the positioning rod 901 to contract inward, and the third elastic element 903 is compressed. When the positioning rod 901 is completely out of the positioning hole 10, the sleeve pipe 4 is unlocked with the stand 1, and the detection box 2 can slide freely, at this time, the detection box 2 is quickly moved upward under the elastic force of the compressed first elastic element 701, and the initial distance between the detection box 2 and the float 7 is maintained. Through the linkage of the float 902 and the elastic element, mechanical automatic response to water level change is realized, all adjustments are driven by buoyancy machinery, without electricity, without external energy or manual intervention, and the pure mechanical structure design is suitable for harsh outdoor environments, is not prone to failure in long-term use, and needs to be checked regularly for wear of the pull rope 904 and the elastic element, and the pull rope 904 is made of wear-resistant material. It should be noted that when the water level drops, the detection box 2 needs to be moved downward synchronously, an extrusion slope 9011 is arranged on the lower side of the end of the positioning rod 901 away from the float 902, when the downward pressure of the detection box 2 on the extrusion slope 9011 through the sleeve pipe 4 is greater than the elastic force of the third elastic element 903, the positioning rod 901 slides to the end away from the sleeve pipe 4 under the force; after the water level drops, the float 7 no longer pushes the detection box 2 upward through the first elastic element 701, so that the upward pushing force on the detection box 2 is reduced, the sleeve pipe 4 moves downward under the action of gravity, the extrusion slope 9011 is resisted by the inner wall of the positioning hole 10 of the stand 1, the positioning rod 901 is out of the positioning hole 10 again, and the detection box 2 automatically sinks to the vicinity of the water surface, and the initial monitoring state is restored.

[0022] This invention also discloses a construction method for a water level monitoring device for an earth-rock dam, comprising the following steps: S1: Initial Installation: Fix column 1 to the earth-rock dam body to ensure its vertical stability; The detection box 2 is slidably fitted onto the column 1 through the sleeve 4, the float 7 is fitted onto the outside of the column 1, the water level measuring instrument 6 is fixed to the top of the detection box 2 through the mounting plate 5, and the GPS positioning module is calibrated. S2: Blockage and flow suppression: Water enters the connecting shell 301 through the filter holes of the filter cylinder 303, and impurities are intercepted on the outside of the filter cylinder 303; The water-suppressing frame 801 reduces the impact of water flow by staggered water-suppressing plates 8011 and cavity components, turning turbulent flow into laminar flow, reducing water surface disturbance in the detection box 2, and improving the accuracy of water level measurement. S3: Water level monitoring: Low water level condition: The detection box 2 is inserted into the positioning hole 10 of the column 1 through the positioning rod 901 to maintain stability, and the water level measuring instrument 6 monitors the water level in the detection box 2 through the detection groove 201; Water level rises: Float 7 rises with the water level, compressing the first elastic element 701; Automatic Reset: When the water level in the detection box 2, i.e. the water level at the earth-rock dam, exceeds the height of the float 902, the float 902 moves upward under buoyancy and applies tension to the positioning rod 901 through the pull rope 904. The third elastic element 903 is compressed, and the positioning rod 901 disengages from the positioning hole 10. The detection box 2 moves upward rapidly under the elastic force of the first elastic element 701 until the distance between the detection box 2 and the float 7 returns to the initial distance. At this time, the float 902 is not affected by buoyancy, and the third elastic element 903 pushes the positioning rod 901 to re-insert into the positioning hole 10, completing the position locking. Water level drop: The float 7 no longer pushes the detection box 2 upward through the first elastic element 701, reducing the upward force on the detection box 2. The pressure surface 9011 and the inner wall of the positioning hole 10 are pressed together to receive the force. The positioning rod 901 disengages from the positioning hole 10 again, and the detection box 2 automatically sinks to the vicinity of the water surface, restoring the initial monitoring state.

[0023] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0024] The above described embodiments are merely intended to describe the preferred embodiments of the present application, and are not intended to limit the scope of the present application, and various modifications and improvements made by those skilled in the art to the technical solutions of the present application without departing from the design spirit of the present application shall fall within the protection scope of the present application as defined by the claims.

Claims

1. An earth and rockfill dam water level monitoring device comprising a post (1), characterized in that, Also include: The detection box (2) is vertically sliding on the stand (1), and the water inlet part (3) is arranged outside the detection box (2); The sleeve (4) is fixedly arranged on the inner wall of the detection box (2) and is connected with the stand (1) in sliding mode, and the positioning assembly is arranged between the sleeve (4) and the stand (1); The mounting plate (5) is connected with the top of the sleeve (4) through the connecting rod (501), and the water level measuring instrument (6) for measuring the water level in the detection box (2) is further connected to the mounting plate (5) through the supporting plate (502), and the GPS positioning module is arranged in the water level measuring instrument (6); And the float (7) is sleeved outside the stand (1), and the first elastic element (701) is arranged between the float (7) and the bottom of the detection box (2).

2. The earth-rock dam water level monitoring device according to claim 1, characterized in that, The water inlet part (3) includes a connecting shell (301) connected with the detection box (2), a circular plate (302) fixedly arranged at one end of the connecting shell (301) away from the detection box (2), and a filter screen cylinder (303) rotatably connected to the circular plate (302), and the connecting shell (301) is provided with a water suppression structure.

3. The earth-rock dam water level monitoring device according to claim 2, characterized in that, The circular arc surface of the filter screen cylinder (303) is provided with uniformly distributed water filtering holes, and the filter screen cylinder (303) is provided with a plurality of circumferentially uniformly distributed actuating pieces (3031) on the circular arc surface, and the water inlet direction of the connecting shell (301) is perpendicular to the water inlet direction of the filter screen cylinder (303).

4. The earth-rock dam water level monitoring device according to claim 3, characterized in that, The water suppression structure includes an elastic telescopic rod (8) fixedly arranged in the connecting shell (301) and a water suppression frame (801) arranged at one end of the elastic telescopic rod (8) away from the inner wall of the connecting shell (301), and the water suppression frame (801) is slidingly connected in the connecting shell (301).

5. The earth-rock dam water level monitoring device according to claim 4, characterized in that, The water suppression frame (801) includes a water suppression plate (8011) arranged in the connecting shell (301) from left to right, and a second elastic element (8012) and a cavity assembly arranged between adjacent two water suppression plates (8011), and the water suppression plate (8011) is provided with a recess hole for water passing through, and the recess holes on adjacent two water suppression plates (8011) are arranged alternately, and the water suppression plate (8011) is slidingly connected in the connecting shell (301).

6. The earth-rock dam water level monitoring device according to claim 5, characterized in that, The cavity assembly includes a first movable plate (8013) and a second movable plate (8014) hinged to each other, the first movable plate (8013) is hinged to one of the adjacent water suppression plates (8011), and the second movable plate (8014) is hinged to the other of the adjacent water suppression plates (8011).

7. The earth-rock dam water level monitoring device according to claim 6, characterized in that, The positioning assembly comprises a sliding pipe (9) arranged outside the sleeve pipe (4), a positioning rod (901) slidingly connected to the sliding pipe (9) and the sleeve pipe (4), a third elastic element (903) arranged between the positioning rod (901) and the inner wall of the sliding pipe (9), and a pull rope (904) connected to the positioning rod (901), wherein the pull rope (904) passes through the sliding pipe (9) at the end away from the positioning rod (901) and is connected with a float (902), and the upright column (1) is provided with a positioning hole (10) matched with the positioning rod (901).

8. The earth-rock dam water level monitoring device according to claim 7, characterized in that, An extrusion inclined surface (9011) is arranged at the lower side of the end of the positioning rod (901) away from the float (902), and when the downward pressure of the detection box (2) on the extrusion inclined surface (9011) through the sleeve pipe (4) is greater than the elastic force of the third elastic element (903), the positioning rod (901) slides to the end away from the sleeve pipe (4) under stress.

9. The earth-rock dam water level monitoring device according to claim 8, characterized in that, The water level measuring instrument (6) comprises one or more of an ultrasonic water level meter, a radar water level meter or a laser water level meter, and the top of the detection box (2) is provided with a detection groove (201) matched with the water level measuring instrument (6).

10. The construction method of the earth-rock dam water level monitoring device according to claim 9, characterized in that, The method comprises the following steps: S1: initial installation: The upright column (1) is fixed on the earth and rockfill dam body to ensure its vertical stability; The detection box (2) is slid onto the upright column (1) through the sleeve pipe (4), the float (7) is sleeved outside the upright column (1), the water level measuring instrument (6) is fixed on the top of the detection box (2) through the mounting plate (5), and the GPS positioning module is calibrated to the position; S2: anti-blocking and flow suppression: The water body enters the connecting shell (301) through the water filtering holes of the filter screen cylinder (303), and the impurities are intercepted outside the filter screen cylinder (303); The water suppression frame (801) slows down the water flow impact through the staggered water suppression plates (8011) and the cavity separation assembly, changes the turbulent flow into laminar flow, reduces the water surface disturbance in the detection box (2), and improves the water level measurement accuracy; S3: water level monitoring: Low water level state: the detection box (2) is stably kept in the positioning hole (10) of the upright column (1) through the positioning rod (901), and the water level measuring instrument (6) monitors the water level in the detection box (2) through the detection groove (201); Water level rising: the float (7) rises with the water level and extrudes the first elastic element (701); Automatic reset: when the water level in the detection box (2) or the water level at the earth and rockfill dam exceeds the height of the float (902), the float (902) is lifted by the buoyancy and exerts a pulling force on the positioning rod (901) through the pull rope (904), the third elastic element (903) is compressed, the positioning rod (901) is separated from the positioning hole (10), the detection box (2) is quickly lifted under the elastic force of the first elastic element (701), and the distance between the detection box (2) and the float (7) returns to the initial distance. At this time, the float (902) is not affected by the buoyancy, the third elastic element (903) pushes the positioning rod (901) to reinsert into the positioning hole (10), and the position locking is completed. Water level drops: the floating body (7) no longer pushes the detection box (2) upward through the first elastic element (701), the upward pushing force on the detection box (2) is reduced, the resistance of the inclined surface (9011) to the inner wall of the positioning hole (10) is overcome, the positioning rod (901) is again separated from the positioning hole (10), and the detection box (2) automatically sinks to the vicinity of the water surface, and the initial monitoring state is restored.

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