Device for detecting moisture content of clay core wall of earth and rockfill dam

Abstract

The utility model belongs to the technical field of clay moisture content detection, and discloses an earth and rockfill dam clay core wall moisture content detection device which comprises a storage bottom plate, and a clay container is placed on the storage bottom plate; a detection assembly and a light source assembly are arranged on the storage bottom plate, and the detection assembly corresponds to the clay container; the detection assembly comprises a third vertical support and a fourth vertical support which are arranged on the storage bottom plate, camera equipment is movably arranged on the third vertical support, an optical filter is movably arranged on the fourth vertical support, and the optical filter is located below the camera equipment and corresponds to a lens of the camera equipment; and the photographic equipment and the optical filter are correspondingly arranged up and down with the clay container. According to the utility model, the optical filter with the specific wavelength is combined with the common camera equipment, and the non-contact detection mode is adopted, so that the rapid and accurate measurement of the clay moisture content is realized, the cost is low, the operation is simple and convenient, the device is particularly suitable for on-site rapid measurement, and the urgent demand of the engineering site on the detection of the clay moisture content is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of clay moisture content detection, in particular to a device for detecting the moisture content of clay core wall of an earth-rock dam. Background Art

[0002] In water conservancy projects, earth-rock dams are a common type of dam, in which the clay core plays a key role in preventing seepage. In the traditional earth-rock dam construction process, the moisture content detection of the clay core usually relies on sampling and laboratory analysis. It takes more than 10 hours to complete a test, which is too time-consuming and inefficient, and cannot reflect the actual situation of the construction site in real time. In addition, this method is difficult to achieve comprehensive and frequent detection in large-scale construction projects, and it is easy to affect the accuracy of the test results due to improper sample handling.

[0003] In the field of core wall clay moisture content detection, scholars have made many innovations. For example, Chinese patent CN111351917A uses the comparative relationship between moisture content and material humidity in a single-chip microcomputer to calculate the measured moisture content, but its device assembly is complex, and the long-term contact of the sensor with soil and other materials will cause the sensor performance to decay; Chinese patent CN216051232U provides a soil moisture content detection through a portable steam condensation device and a gravity sensor, but it still requires long-term heating, and the portability of its portable device is not high; Chinese patent CN103267702A discloses a soil sample moisture content rapid detection method based on the drying and weighing method. The detector uses infrared lamps and microwave heating to greatly shorten the drying time, but the instrument is large in size and is not suitable for high-frequency rapid measurement on site; Chinese patent CN105116016A measures soil moisture content based on the resistance method through a rapid detection circuit of water-containing soil moisture content, but its measurement range is limited and the accuracy is not high; Chinese patent CN104297270A obtains the relationship between the CT value of the red clay sample and the moisture content and dry density based on CT scanning, thereby detecting soil moisture content, but due to the presence of certain radiation in this method, the safety is low, and the equipment price is high.

[0004] In recent years, the dielectric method of measuring soil moisture content by soil dielectric properties has gradually developed, especially time domain reflectometry (TDR) and frequency domain reflectometry (FDR). These methods have advantages in real-time performance and precision, and the operation is also more convenient and flexible, but they are mainly used in agriculture and ecological fields, and are less used in the field of core wall clay detection with large differences from ordinary soil in terms of soil properties. For example, Chinese patent CN106814092A uses a time domain reflectometer and a probe (composed of a PVC pipe and a probe), which depends on the electromagnetic wave propagation time to measure the dielectric constant of the soil material, thereby calculating the moisture content, but its detection equipment still needs to directly contact the soil material to obtain data.

[0005] In recent years, optical-based techniques for detecting moisture content in clay have made significant progress. In particular, light in the short-wave infrared (SWIR) region has been shown to be particularly sensitive for assessing moisture content in clay, due to the high absorption coefficient of water molecules to these wavelengths. However, existing optical detection equipment is usually expensive and requires professional operation and maintenance.

[0006] Therefore, the present application designs a device for detecting moisture content of clay core wall of earth-rock dam to solve the above technical problems. Utility Model Content

[0007] In order to solve the above technical problems, the utility model proposes a device for detecting moisture content of clay core wall of earth-rock dam, which provides a cost-effective and easy-to-deploy solution through non-contact detection method, and is particularly suitable for rapid measurement of moisture content of core wall on site.

[0008] To achieve the above-mentioned purpose, the utility model provides a moisture content detection device for clay core wall of earth-rock dam, comprising a storage bottom plate, a clay container for storing clay is placed on the storage bottom plate; a detection component is arranged on one side of the storage bottom plate, a light source component is arranged on the other side of the storage bottom plate, and the detection component and the clay container are arranged correspondingly up and down;

[0009] The detection assembly includes a third vertical bracket and a fourth vertical bracket arranged on the storage bottom plate, a camera device is movably arranged on the third vertical bracket, and a filter is movably arranged on the fourth vertical bracket, the filter is located below the camera device and is arranged corresponding to the lens of the camera device;

[0010] The photographic device and the optical filter are arranged correspondingly to the clay container above and below.

[0011] Preferably, the filtering wavelength of the filter is 400nm-2500nm.

[0012] Preferably, the light source assembly includes a first vertical bracket and a second vertical bracket correspondingly arranged on the storage base plate, and an infrared lamp tube for providing illumination is arranged between the top ends of the first vertical bracket and the second vertical bracket.

[0013] Preferably, a first transverse telescopic bracket is movably mounted on the third vertical bracket, and the photographic device is fixedly mounted on an end of the first transverse telescopic bracket away from the third vertical bracket.

[0014] Preferably, a second transverse telescopic bracket is movably mounted on the fourth vertical bracket, and the optical filter is fixedly mounted on an end of the second transverse telescopic bracket away from the fourth vertical bracket.

[0015] Preferably, a black bottom plate is placed on the storage bottom plate, and the clay container with an open top is placed on the black bottom plate.

[0016] Preferably, the top surface of the black bottom plate away from the storage bottom plate is painted with matte black paint.

[0017] Preferably, the photographic device is electrically connected to an image processing computer.

[0018] Compared with the prior art, the utility model has the following advantages and technical effects: the utility model discloses a device for detecting moisture content of clay core wall of earth-rock dam. During detection, the clay wall to be detected is placed in a clay container, and then the clay container is placed on a storage bottom plate, and then the position of the detection component is adjusted to be directly above the clay container, and the clay in the clay container is non-contact detected by the detection component; the camera is installed on the third vertical bracket, and the filter is installed on the fourth vertical bracket, and the deflection angle and height thereof can be adjusted, so that it can be conveniently aligned with the clay container, and it is also convenient to fold it up for storage when not in use; during the detection process, the filter is aligned with the lens position of the camera, and the filter has high transmittance and excellent optical performance, thereby improving the accuracy of detection.

[0019] The utility model utilizes the combination of a filter of a specific wavelength and an ordinary photographic device to realize a rapid and accurate measurement of the moisture content of clay through a non-contact detection method. It has low cost and is easy to operate, making it particularly suitable for rapid on-site measurement and meeting the urgent need for clay moisture content detection at engineering sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a moisture content detection device for clay core wall of an earth-rock dam according to the utility model;

[0022] In the figure: 1. storage base; 2. black base; 3. clay container; 4. first vertical bracket; 5. second vertical bracket; 6. third vertical bracket; 7. fourth vertical bracket; 8. second horizontal telescopic bracket; 9. first horizontal telescopic bracket; 10. infrared lamp; 11. camera equipment; 12. filter; 13. image processing computer; 14. storage table; 15. data cable. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Reference Figure 1 As shown, this embodiment provides a moisture content detection device for clay core wall of earth-rock dam, comprising a storage bottom plate 1, a clay container 3 for storing clay is placed on the storage bottom plate 1; a detection component is arranged on one side of the storage bottom plate 1, and a light source component is arranged on the other side of the storage bottom plate 1, and the detection component and the clay container 3 are arranged correspondingly up and down;

[0026] The detection assembly includes a third vertical bracket 6 and a fourth vertical bracket 7 arranged on the storage bottom plate 1, a camera device 11 is movably arranged on the third vertical bracket 6, and a filter 12 is movably arranged on the fourth vertical bracket 7, the filter 12 is located below the camera device 11 and is arranged corresponding to the lens of the camera device 11;

[0027] The camera device 11 and the filter 12 are arranged correspondingly to the clay container 3 above and below.

[0028] The utility model discloses a device for detecting the moisture content of clay core wall of earth-rock dam. When detecting, after the clay wall to be detected is placed in a clay container 3, the clay container 3 is placed on a storage bottom plate 1, and then the position of the detection component is adjusted to be just above the clay container 3, and the clay in the clay container 3 is non-contact detected by the detection component; the camera 11 is installed on the third vertical bracket 6, and the filter 12 is installed on the fourth vertical bracket 7, and its deflection angle and height can be adjusted, so that it can be conveniently aligned with the clay container 3, and it is also convenient to fold it up for storage when not in use; during the detection process, the filter 12 is aligned with the lens position of the camera 11, and the filter 12 has high transmittance and excellent optical performance, which improves the accuracy of the detection. The utility model utilizes the combination of a filter 12 of a specific wavelength and an ordinary camera 11, and realizes the rapid and accurate measurement of the moisture content of the clay through a non-contact detection method, with low cost and simple operation, so that it is particularly suitable for on-site rapid measurement, and meets the urgent demand for clay moisture content detection on the engineering site.

[0029] Furthermore, the thickness of the clay in the clay container 3 is not less than 4 cm. During the inspection, the center of the clay container 3 and the center positions of the lens of the camera 11 and the filter 12 are vertically aligned, with an allowable deviation of ±1 mm.

[0030] Furthermore, the photographing device 11 of the present embodiment is a photographing device that does not include an infrared cut-off filter, such as a camera or a mobile phone, and does not cut off infrared light.

[0031] According to a further optimization scheme, the filter wavelength of the filter 12 is 1400nm-2500nm. The filter 12 is a filter 12 with a wavelength of 1400nm to 2500nm, which is specially designed to absorb and transmit light of a specific wavelength to enhance the spectral characteristics of water in the image.

[0032] Further optimization scheme, the light source assembly includes a first vertical bracket 4 and a second vertical bracket 5 correspondingly arranged on the storage base plate 1, and an infrared lamp tube 10 for providing illumination is arranged between the tops of the first vertical bracket 4 and the second vertical bracket 5. The first vertical bracket 4 and the second vertical bracket 5 are arranged on the third vertical bracket 6 and the fourth vertical bracket 7, respectively, at the four corners of the storage base plate 1; the infrared lamp tube 10 is installed between the first vertical bracket 4 and the second vertical bracket 5, and can adapt to a variety of infrared lamp tubes 10 or other infrared radiation technologies. The illumination angle and brightness of the infrared lamp tube 10 can be achieved by rotating the protective cover outside the infrared lamp tube 10 to adapt to changes in on-site lighting conditions, and to adapt to different ambient light conditions and the characteristics of the clay surface for detection; to ensure image quality.

[0033] Furthermore, the infrared lamp tube 10 of this embodiment can be turned off on sunny days, and needs to be turned on on cloudy days because the outdoor infrared light will be blocked by clouds, ensuring that shooting can be performed on both sunny and cloudy days.

[0034] Furthermore, a detachable connection device is provided between the first vertical bracket 4, the second vertical bracket 5, the third vertical bracket 6 and the fourth vertical bracket 7 of the present embodiment and the storage base plate 1 to facilitate on-site assembly and disassembly. The connection method can be any mechanical connection method that allows relative movement or positioning, including but not limited to bolt connection, snap connection or magnetic connection. This connection method allows the selection of fixed or non-fixed assembly methods according to needs in different occasions.

[0035] Further optimization scheme, the third vertical bracket 6 is provided with a first transverse telescopic bracket 9, and the camera 11 is fixedly mounted on the end of the first transverse telescopic bracket 9 away from the third vertical bracket 6; the fourth vertical bracket 7 is provided with a second transverse telescopic bracket 8, and the filter 12 is fixedly mounted on the end of the second transverse telescopic bracket 8 away from the fourth vertical bracket 7. The first transverse telescopic bracket 9 and the second transverse telescopic bracket 8 are connected to the corresponding first vertical bracket 4 and the second vertical bracket 5 through a smooth clamp with controllable tightness to achieve the functions of moving up and down and rotating around the corresponding vertical bracket; at the same time, the length of the first transverse telescopic bracket 9 and the second transverse telescopic bracket 8 can be adjusted by telescopic adjustment, and the design of the first transverse telescopic bracket 9 and the second transverse telescopic bracket 8 allows the user to adjust the position and angle of the camera 11 and the filter 12, the position range is limited between the third vertical bracket 6 and the fourth vertical bracket 7, and the angle range is between 0° and 360° to adapt to different test environments and clay surface conditions.

[0036] Furthermore, in this embodiment, the first vertical bracket 4 and the second vertical bracket 5 have the same height, and the height of the first vertical bracket 4 is lower than the height of the third vertical bracket 6 .

[0037] Further optimization scheme, a black base plate 2 is placed on the storage base plate 1, and a clay container 3 with an open top is placed on the black base plate 2; the top surface of the black base plate 2 away from the storage base plate 1 is painted with matte black paint. The black base plate 2 is mounted on the storage base plate 1, and the clay container 3 is placed on the black base plate 2 for easy support; at the same time, the black base plate 2 removes stray light, and creates a good lighting environment with a controllable light source to improve image quality. Its surface is painted with matte black paint to minimize light reflection and scattering.

[0038] Further optimizing the scheme, the camera device 11 is electrically connected to the image processing computer 13. The camera device 11 is connected to the image processing computer 13 via a data line 15, and receives and processes the short-wave infrared (SWIR) image taken by the camera device 11. The image can be processed on site and conclusions can be drawn to achieve real-time detection of the moisture content of the clay. When in use, the clay samples at different moisture contents are photographed and processed in advance to obtain the SWIR image information of the clay at different moisture contents of the corresponding project and normalize it, which is used as a reference image. Subsequently, the SWIR image of the clay sample at the project site is normalized and compared with the SWIR image of the soil sample after normalization at the determined moisture content to determine the moisture content information of the clay sample at the site, and to achieve real-time monitoring of the moisture content of the clay at the site.

[0039] Furthermore, the built-in software of the image processing computer 13 includes an image processing module, a data analysis module and a user interface module. The image processing module is used to adjust the image quality and extract key spectral data, and normalize the image; the data analysis module analyzes and compares the spectral features in the image with the pre-prepared reference image to obtain the moisture content of the clay; the user interface module provides an intuitive operation interface, showing the comparison between the test image and the reference soil sample and the measured moisture content result.

[0040] Furthermore, for convenience, in this embodiment, it can be selected whether to prepare a storage table 14 for supporting and placing the image processing computer 13 according to actual conditions.

[0041] Furthermore, the storage table 14 of this embodiment can be any device that can provide support for the image processing computer 13 .

[0042] Furthermore, since the moisture on the surface of the clay in the clay container 3 will evaporate, the local moisture content of the surface soil is not representative, which affects the quality of the SWIR image and must be gently scraped off with a knife during detection.

[0043] Directions:

[0044] 1. Preparation:

[0045] 1. Install the camera 11 and the filter 12: fix the camera 11 to the free end of the first transverse telescopic bracket 9, and install the first transverse telescopic bracket 9 on the third vertical bracket 6, ensuring that the lens of the camera 11 is facing downward to the surface of the clay container 3; then install the filter 12 on the free end of the second transverse telescopic bracket 8, and install the second transverse telescopic bracket 8 on the fourth vertical bracket 7, so that the filter 12 is located below the lens of the camera 11, ensuring that the filter 12 is closely aligned with the lens of the camera 11.

[0046] 2. Arrange the light source: Arrange the infrared lamp tube 10 between the first vertical bracket 4 and the second vertical bracket 5, and adjust it to a suitable height and angle to ensure that the clay surface in the clay container 3 is evenly illuminated.

[0047] 3. Prepare clay samples with different moisture contents: Place a black base plate 2 on the storage base plate 1, place the clay in a clay container 3 in the center of the black base plate 2, and use a knife to flatten the surface to reduce the impact of surface roughness on the test results.

[0048] 4. Turn on the light source and adjust it: adjust the brightness of the infrared lamp 10 according to the lighting conditions on site to ensure that there is no reflection or shadow on the clay surface.

[0049] 5. Capturing images: Turn on the camera 11 and capture the SWIR image of the clay through the filter 12. Take multiple shots to ensure that the captured image is clear for subsequent analysis.

[0050] 6. Image transmission and analysis: The image obtained by the camera 11 is transmitted in real time to the connected image processing computer 13 via the data line 15. The image processing computer 13 processes the image through built-in software to obtain reference SWIR images at different moisture contents.

[0051] 2. Field test:

[0052] 8. Repeat steps 1 and 2.

[0053] 9. Prepare clay samples from the construction site. Place the clay in the clay container 3 in the center of the black base plate 2 and use a knife to flatten the surface to reduce the impact of surface roughness on the test results.

[0054] 10. Repeat steps 4 to 6.

[0055] 11. Result display and adjustment: The analysis results are immediately displayed on the image processing computer 13 software interface. The computer compares the test image with the reference image to verify the analysis results, gives the value of the moisture content of the clay core wall on site, compares it with the optimal moisture content, and gives corresponding construction compaction suggestions.

[0056] By adopting the above technical solution, the system can accurately detect and display the moisture content of clay in real time, improving construction efficiency and quality control level; in addition, the system is easy to assemble, low-cost, can be arranged outdoors and is suitable for a variety of environments, making it easy to be widely used in various engineering construction sites.

[0057] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for detecting moisture content of clay core wall of earth-rock dam, characterized in that: It comprises a storage base plate (1), on which a clay container (3) for storing clay is placed; a detection component is arranged on one side of the storage base plate (1), and a light source component is arranged on the other side of the storage base plate (1); the detection component and the clay container (3) are arranged in correspondence with each other; The detection assembly comprises a third vertical bracket (6) and a fourth vertical bracket (7) arranged on the storage bottom plate (1); a camera device (11) is movably arranged on the third vertical bracket (6); and a filter (12) is movably arranged on the fourth vertical bracket (7); the filter (12) is located below the camera device (11) and is arranged corresponding to the lens of the camera device (11); The photographic device (11) and the optical filter (12) are arranged correspondingly above and below the clay container (3).

2. The device for detecting moisture content of clay core wall of earth-rock dam according to claim 1, characterized in that: The filtering wavelength of the filter (12) is 1400nm-2500nm.

3. The device for detecting moisture content of clay core wall of earth-rock dam according to claim 1, characterized in that: The light source assembly comprises a first vertical bracket (4) and a second vertical bracket (5) which are arranged correspondingly on the storage base plate (1); an infrared lamp tube (10) for providing illumination is arranged between the top ends of the first vertical bracket (4) and the second vertical bracket (5).

4. The device for detecting moisture content of clay core wall of earth-rock dam according to claim 1, characterized in that: A first transverse telescopic bracket (9) is movably mounted on the third vertical bracket (6), and the photographic device (11) is fixedly mounted on an end of the first transverse telescopic bracket (9) away from the third vertical bracket (6).

5. The device for detecting moisture content of clay core wall of earth-rock dam according to claim 4, characterized in that: A second transverse telescopic bracket (8) is movably mounted on the fourth vertical bracket (7), and the optical filter (12) is fixedly mounted on an end of the second transverse telescopic bracket (8) away from the fourth vertical bracket (7).

6. The device for detecting moisture content of clay core wall of earth-rock dam according to claim 1, characterized in that: A black bottom plate (2) is placed on the storage bottom plate (1), and the clay container (3) with an open top is placed on the black bottom plate (2).

7. The device for detecting moisture content of clay core wall of earth-rock dam according to claim 6, characterized in that: The top surface of the black bottom plate (2) away from the storage bottom plate (1) is painted with matte black paint.

8. The device for detecting moisture content of clay core wall of earth-rock dam according to claim 1, characterized in that: The photographic device (11) is electrically connected to an image processing computer (13).

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