A soil and rock dam water level monitoring device and construction method

Abstract

The application discloses a kind of earth-rock dam water level monitoring device and construction method, belong to water level monitoring technical field.A kind of earth-rock dam water level monitoring device, including stand, still include: detection box, detection box vertically slide on stand, detection box outside is provided with inlet portion;Sleeve, sleeve is fixed in the inner wall of detection box and is slidably connected with stand, positioning assembly is arranged between sleeve and stand;Mounting plate, mounting plate is connected with the top of sleeve by connecting rod, and mounting plate is also connected with water level measuring instrument for measuring the water level in detection box by support plate, and GPS positioning module is arranged in water level measuring instrument;And float, float is sleeved on the outside of stand, and first elastic element is arranged between float and the bottom of detection box;The application is optimized by mechanical linkage and fluid, solves the problem in traditional water level monitoring blind area, immersion, turbulence interference etc., realizes the self-adapting, high-precision monitoring of earth-rock dam water level, is applicable to the scene of heavy rain or water level fluctuation.

Description

TECHNICAL FIELD

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

[0002] The soil and rock dam refers to the dam built by local soil, stone or mixed material through methods such as throwing and rolling. When the dam material is mainly soil and gravel, it is called earth dam; when it is mainly stone, pebble and blasting stone, it is called rockfill dam; when both types of local materials are in a considerable proportion, it is called soil and rock mixed dam. During the rainy season or when heavy rain suddenly falls, the water level intercepted by the soil and rock dam will rise, which will have a certain impact on the soil and rock dam, and even cause damage to 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 method is to set a measuring instrument on the water surface to monitor the water level. However, if the water level rises above the position of the measuring instrument, the measuring instrument will be damaged when it is immersed in the water. If the initial position of the measuring instrument is set too high, the non-contact device (such as radar and ultrasonic water level meter) will have a measurement blind area, and the installation of the measuring instrument will be too high to cover the near-water area. At the same time, the installation of the measuring instrument is easy to be affected by the wind resistance, which will cause the rod body to tilt and affect the measurement results. SUMMARY

[0003] The present application relates to the technical field of water level monitoring, in particular to 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:

[0005] A soil and rock dam water level monitoring device, comprising a stand column, further comprising:

[0006] A detection box vertically slides on the stand column, and a water inlet portion is arranged outside the detection box;

[0007] A sleeve is fixedly arranged on the inner wall of the detection box and connected with the stand column in sliding mode, and a positioning assembly is arranged between the sleeve and the stand column;

[0008] An installation plate is connected with the top of the sleeve through a connecting rod, and a water level measuring instrument for measuring the water level in the detection box is further connected to the installation plate through a supporting plate, and a GPS positioning module is arranged in the water level measuring instrument;

[0009] and a float is sleeved on the outer side of the stand column, and a first elastic element is arranged between the float and the bottom of the detection box.

[0010] Preferably, the water inlet portion comprises a connecting shell connected 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 to the circular plate, and a water retaining structure is arranged in the connecting shell.

[0011] Preferably, the filter screen barrel is provided with uniformly distributed water filtering holes on the circular arc surface, and the filter screen barrel is provided with a plurality of circumferentially uniformly distributed push pieces on the circular arc surface.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] The application also discloses a construction method of the soil and rock dam water level monitoring device.

[0019] S1: initial installation:

[0020] Fix the vertical column on the soil and rock dam body to ensure its vertical stability;

[0021] Slide the detection box through the sleeve pipe on the vertical column, 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.

[0022] S2: Anti-blocking and flow suppression

[0023] The water body enters the connecting shell through the filter hole of the filter screen cylinder, and impurities are intercepted outside the filter screen cylinder;

[0024] The water suppression frame slows down the water flow impact through the staggered water suppression plates and cavity components, changes the turbulent flow into laminar flow, reduces the water surface disturbance in the detection box, and improves the water level measurement accuracy;

[0025] S3: Water level monitoring

[0026] 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 meter monitors the water level in the detection box through the detection groove;

[0027] Water level rising: the float rises with the water level and squeezes the first elastic element;

[0028] 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 reinsert into the positioning hole, and the position locking is completed;

[0029] Water level falling: the float no longer pushes the detection box upward through the first elastic element, reducing the upward pushing force on the detection box, the resistance between the inclined surface and the inner wall of the positioning hole, the positioning rod is separated from the positioning hole again, and the detection box automatically sinks to the vicinity of the water surface, returning to the initial monitoring state.

[0030] From the above technical solutions, the present application has the following beneficial effects:

[0031] 1. In the present application, the height of the water level meter is automatically adjusted by using the buoyancy, solving the problem that when the traditional radar / ultrasonic / laser water level meter is installed too high, the near-water surface area cannot be covered, and when it is installed too low, the water level meter is damaged by being submerged, so that the detection box is always close to the water surface, avoiding the influence of the blind area, ensuring the service life of the equipment and the accuracy of the monitoring results;

[0032] 2. In the present application, the filter screen cylinder is arranged at the water inlet part, which can filter and intercept impurities in the water, avoid impurities entering the detection box and covering the detection water level, and affect the accuracy of the water level measurement result, and the stirring piece is arranged outside the filter screen cylinder, when the water flows from the filter screen cylinder, the stirring piece is driven to rotate the filter screen cylinder, so that the original water inlet direction of the filter screen cylinder becomes the water outlet direction, the impurities adhering 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;

[0033] 3. In the application, by connecting the water inlet direction of the shell with the water inlet direction of the filter screen cylinder vertically, the water impact force entering the connecting shell is smaller than the water impact force directly entering the filter screen cylinder, the water suppression frame in the connecting shell is layered and buffered, the influence of turbulence on water level measurement is reduced, the water surface in the detection box is reduced, the water level measurement precision is improved;

[0034] 4. In the application, by setting the positioning assembly positioning sleeve and the stand column, the stability of the water level measuring instrument for measuring the water level in the detection box is improved, the detection box is prevented from shaking under the action of water and wind, and the measurement error caused by external interference is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The structure of the application is shown in the figure Figure 1 ;

[0036] Figure 2 The structure of the application is shown in the figure Figure 2 ;

[0037] Figure 3 The cross-sectional structure of the application is shown in the figure

[0038] Figure 4 The structure of the application is shown in the figure Figure 3 A part of the application is shown in the figure

[0039] Figure 5 The external structure of the sleeve of the application is shown in the figure

[0040] Figure 6 The cross-sectional structure of the sleeve of the application is shown in the figure

[0041] Figure 7 The external structure of the mounting plate of the application is shown in the figure

[0042] Figure 8 The structure of the filter screen cylinder of the application is shown in the figure

[0043] Figure 9 The cross-sectional structure of the detection box of the application is shown in the figure

[0044] Figure 10 The structure of the water suppression frame of the application is shown in the figure

[0045] Figure 11 The structure of the cavity assembly of the application is shown in the figure

[0046] In the figure: 1, a column; 2, a detection box; 201, a detection groove; 3, a water inlet part; 301, a connecting shell; 302, a round plate; 303, a filter screen cylinder; 3031, a push piece; 4, a sleeve; 5, a mounting plate; 501, a connecting rod; 502, a support plate; 6, a water level measuring instrument; 7, a float; 701, a first elastic element; 8, an elastic telescopic rod; 801, a water suppression frame; 8011, a water suppression plate; 8012, a second elastic element; 8013, a first movable plate; 8014, a second movable plate; 9, a sliding pipe; 901, a positioning rod; 9011, a pressing inclined surface; 902, a float block; 903, a third elastic element; 904, a pull rope; 10, a positioning hole. DETAILED DESCRIPTION

[0047] A preferred embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0048] To achieve the above object, the embodiments of the present application adopt the following technical solutions:

[0049] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 9 , 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 is provided with a built-in GPS module for positioning. A detection groove 201 is formed in the top of the detection box 2 and cooperates with the water level measuring instrument 6. 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.

[0050] 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 on the top of the detection box 2 through the mounting plate 5, the position is calibrated by the GPS positioning module, the float 7 and the first elastic element 701 are linked 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 the 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 submerged and damaged 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.

[0051] 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 includes a connecting shell 301 communicating with the detection box 2, the connecting shell 301 is a hollow shell, one end communicates with the detection box 2, the other end is fixed with a circular plate 302, the inside is provided with a water suppression structure, which serves as a water flow channel to guide the water filtered by the filter screen cylinder 303 into the detection box 2 and slow down the water flow impact through the water suppression structure; the circular plate 302 is fixed at the end of the connecting shell 301, and is rotatably connected with the filter screen cylinder 303 outside, supports the filter screen cylinder 303 and allows it to rotate freely, while sealing the end of the connecting shell 301 to prevent water leakage;

[0052] 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 a plurality of circumferentially arranged actuating pieces 3031, and the water inlet direction of the filter screen cylinder 303 is perpendicular to the connecting shell 301; the filter screen cylinder 303 can intercept impurities in the water, prevent the detection box 2 from being blocked, and prevent impurities from entering the detection box 2 and covering the detection water level, affecting the accuracy of the water level measurement result, and 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 the water outlet direction, and the impurities adhered to the filter screen cylinder 303 are impacted and separated, without affecting the normal passage of the water flow, reducing the influence of the filter screen cylinder 303 blockage on the measurement result.

[0053] 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 telescopic rod 8 fixed in the connecting shell 301 and a water suppression frame 801 provided at the end of the elastic telescopic rod 8 away from the inner wall of the connecting shell 301, the elastic telescopic rod 8 is fixed to the inner wall of the connecting shell 301 to provide axial elastic support and allow the water suppression frame 801 to slide in the connecting shell 301 to adapt to the water flow impact under different flow rates;

[0054] Further, the water suppression frame 801 includes a water suppression plate 8011 sequentially arranged from left to right in the connecting shell 301 and a second elastic element 8012 and a partition cavity assembly arranged between adjacent two water suppression plates 8011, the water suppression plate 8011 is provided with a recess hole for water to pass through, the recess holes on the adjacent two water suppression plates 8011 are staggered, and the water suppression plate 8011 is slidingly connected in the connecting shell 301;

[0055] Further, the cavity assembly comprises 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 retaining plates 8011, and the second movable plate 8014 is hingedly connected to the other of the adjacent water retaining plates 8011;

[0056] Specifically, the water filtered by the filter screen cylinder 303 enters through the connecting shell 301, the staggered holes of the water retaining plate 8011 divide the water flow into multiple laminar flows, when the water flow passes through the water retaining frame 801, the cavity assembly expands and contracts with the pressure, prolongs the flow path and consumes kinetic energy, the water retaining plate 8011 is slidingly matched with the inner wall of the connecting shell 301, and dynamic adjustment is realized through the elastic expansion rod 8 and the second elastic element 8012, the water retaining plate 8011 adjusts the sliding distance to adapt to different flow rates, after being divided by multiple layers of water retaining plates 8011, the turbulent flow is gradually converted into stable laminar flow, and finally smoothly enters the detection box 2, which significantly improves the anti-interference ability and measurement accuracy of the earth-rock dam water level monitoring, and is suitable for flow fluctuation scenes such as heavy rain.

[0057] Referring to Figure 3 、 Figure 6 、 Figure 7 and Figure 9 , 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 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, 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 column 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 column 1; the pull rope 904 passes through the sliding pipe 9 and is connected with a float 902 at an end away from the positioning rod 901, and the stand column 1 is provided with a 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 through the pull rope 904;

[0058] 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 column 1, and fixes the position of the sleeve pipe 4, so as to ensure the stability of the water level measurement process of the water level measuring instrument 6;

[0059] When the water level rises, the float 902 is pushed up, the pull rope 904 is pulled to drive the positioning rod 901 to contract inward, and the third elastic element 903 is compressed,

[0060] When the positioning rod 901 is completely separated from the positioning hole 10, the sleeve pipe 4 is unlocked with the stand column 1, and the detection box 2 can be freely slid, at this time, the detection box 2 is quickly moved up under the elastic pushing of the compressed first elastic element 701, so that the initial distance between the detection box 2 and the float body 7 is kept;

[0061] Through the linkage of the floating block 902 and the elastic element, mechanical automatic response to water level change is realized, all adjustments are driven by the buoyancy mechanism, no electricity is needed, no external energy or manual intervention is needed, the pure mechanical structure design is suitable for harsh environments in the wild, long-term use is not prone to failure, and the wear condition of the pull rope 904 and the elastic element needs to be checked regularly, and the pull rope 904 is made of wear-resistant material;

[0062] It should be noted that when the water level drops, the detection box 2 needs to be synchronously moved down, the lower side of the end, away from the floating block 902, of the positioning rod 901 is provided with an extrusion inclined surface 9011, 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 is forced to slide away from the end of the sleeve pipe 4; after the water level drops, the float body 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 is moved downward under the action of gravity, the extrusion inclined surface 9011 is resisted by the inner wall of the positioning hole 10 of the stand column 1, the positioning rod 901 is again separated from the positioning hole 10, and the detection box 2 is automatically sunk to the vicinity of the water surface, and the initial monitoring state is restored.

[0063] The application further discloses a construction method of the earth and rockfill dam water level monitoring device.

[0064] S1: initial installation:

[0065] The stand column 1 is fixed on the earth and rockfill dam body, and the vertical stability is ensured;

[0066] The detection box 2 is slid onto the stand column 1 through the sleeve pipe 4, the float body 7 is sleeved outside the stand 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 in position;

[0067] S2: anti-blocking and flow suppression:

[0068] The water body enters the connecting shell 301 through the water filtering holes of the filter screen cylinder 303, and impurities are intercepted outside the filter screen cylinder 303;

[0069] The water suppression frame 801 slows down the water flow impact through the staggered water suppression plates 8011 and the cavity separation assembly, so that the turbulent flow becomes laminar flow, the water surface in the detection box 2 is reduced, and the water level measurement accuracy is improved;

[0070] S3: water level monitoring:

[0071] Low water level state: the detection box 2 is kept stable by the positioning rod 901 inserted into the positioning hole 10 of the stand column 1, and the water level meter 6 monitors the water level in the detection box 2 through the detection groove 201;

[0072] Water level rising: the float 7 floats with the water level, and the first elastic element 701 is compressed;

[0073] Automatic reset: when the water level in the detection box 2, i.e. the water level at the earth and rock 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 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 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;

[0074] Water level falling: 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 resistance between the inclined surface 9011 and the inner wall of the positioning hole 10 is reduced, the positioning rod 901 is separated from the positioning hole 10 again, and the detection box 2 automatically sinks to the vicinity of the water surface to restore the initial monitoring state.

[0075] The drawings in the specification of the present application are only of a schematic nature, and the size and shape of each component shown are not actual limits but only a schematic representation. In the actual implementation process, each component can be reasonably configured and adjusted according to specific needs and actual conditions.

[0076] The above-described embodiments only describe the preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. An earth and rockfill dam water level monitoring device comprising a post (1), characterized in that, Also includes: The test box (2) slides vertically on the column (1) and the test box (2) is provided with a water inlet (3) on the outside. A sleeve (4) is fixed to the inner wall of the detection box (2) and slidably connected to the column (1). A positioning component is provided between the sleeve (4) and the column (1). Mounting plate (5), which is connected to the top of sleeve (4) via connecting rod (501), and the mounting plate (5) is also connected to a water level measuring instrument (6) for measuring the water level in the detection box (2) via support plate (502), and the water level measuring instrument (6) is equipped with a GPS positioning module. And a float (7), the float (7) is sleeved on the outside of the column (1), and a first elastic element (701) is provided between the float (7) and the bottom of the detection box (2). The positioning assembly includes a slide tube (9) disposed on the outside of the sleeve (4), a positioning rod (901) slidably connected to the slide tube (9) and the sleeve (4), a third elastic element (903) disposed between the positioning rod (901) and the inner wall of the slide tube (9), and a pull rope (904) connected to the positioning rod (901). The end of the pull rope (904) away from the positioning rod (901) passes through the slide tube (9) and is connected to a float (902). The column (1) is provided with a positioning hole (10) that cooperates with the positioning rod (901). The water inlet (3) includes a connecting shell (301) connected to the detection box (2), a circular plate (302) fixed at one end of the connecting shell (301) away from the detection box (2), and a filter cylinder (303) rotatably connected to the circular plate (302). A water-suppressing structure is provided inside the connecting shell (301). The positioning rod (901) has a pressing slope (9011) on the lower side of the end away from the float (902). When the downward pressure of the detection box (2) on the pressing slope (9011) through the sleeve (4) is greater than the elastic force of the third elastic element (903), the positioning rod (901) is forced to slide towards the end away from the sleeve (4). The water level measuring instrument (6) includes one or more of ultrasonic water level gauges, radar water level gauges or laser water level gauges, and the top of the detection box (2) is provided with a detection slot (201) that cooperates with the water level measuring instrument (6).

2. The earth-rock dam water level monitoring device according to claim 1, characterized in that, The filter cylinder (303) has uniformly distributed filter holes on its arc surface. The filter cylinder (303) has several circumferentially distributed actuating plates (3031) on its arc surface. The water inlet direction of the connecting shell (301) is perpendicular to the water inlet direction of the filter cylinder (303).

3. The earth-rock dam water level monitoring device according to claim 2, characterized in that, The water-suppressing structure includes an elastic telescopic rod (8) fixed in the connecting shell (301) and a water-suppressing frame (801) disposed at one end of the elastic telescopic rod (8) away from the inner wall of the connecting shell (301), the water-suppressing frame (801) being slidably connected in the connecting shell (301).

4. The earth-rock dam water level monitoring device according to claim 3, characterized in that, The water suppression frame (801) comprises water suppression plates (8011) arranged in the connecting shell (301) from left to right, and cavity separation assemblies and second elastic elements (8012) 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 adjacent two water suppression plates (8011) are staggered, and the water suppression plates (8011) are slidingly connected in the connecting shell (301).

5. The earth-rock dam water level monitoring device according to claim 4, characterized in that, The cavity separation assembly comprises 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).

6. The construction method of the earth-rock dam water level monitoring device according to claim 5, characterized in that, The method comprises the following steps: S1: initial installation: Fix the stand (1) on the dam body of the earth-rock dam, and ensure that it is vertically stable; Slide the detection box (2) on the stand (1) through the sleeve pipe (4), the float (7) is sleeved outside the stand (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 passes through the water filtering holes of the filter screen cylinder (303) into the connecting shell (301), 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 assemblies, 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 inserted into the positioning hole (10) of the stand (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 squeezes the first elastic element (701); Automatic reset: when the water level in the detection box (2) is higher than the height of the float (902), the float (902) is moved upward 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 moved upward under the elastic force of the first elastic element (701), and the distance between the detection box (2) and the float (7) is restored 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 falling: 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 resistance between the inclined surface (9011) and the inner wall of the positioning hole (10) is reduced, the positioning rod (901) is separated from 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.

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