In-situ monitoring system for moisture content of high-speed rail roadbed

Abstract

The utility model discloses a high-speed rail roadbed moisture content in-situ monitoring system, and particularly relates to the field of geotechnical engineering soil physical parameter measurement, which comprises a stainless steel protective cover, a camera is arranged in the stainless steel protective cover, a transparent glass diaphragm is arranged at the front end of the stainless steel protective cover, and a front end cover is fixedly arranged at the outer end of the transparent glass diaphragm. The front end cover is arranged at the front end of the stainless steel protective cover, a lens of the camera faces the transparent glass diaphragm, and water absorption test paper is arranged on the front side of the transparent glass diaphragm. According to the utility model, the water-absorbing test paper absorbs soil moisture to cause color change, then the camera acquires an image of the water-absorbing test paper in a proper light environment, and finally the computer analyzes the image of the water-absorbing test paper to obtain the moisture content of the soil. Therefore, continuous, non-disturbance, accurate, reliable and real-time in-situ monitoring on the soil moisture content is realized, and the method is more suitable for detecting the moisture content of the high-speed rail roadbed soil.

Description

Technical Field

[0001] The utility model relates to the field of geotechnical engineering soil physical parameter measurement, and more specifically to an in-situ monitoring system for moisture content of a high-speed railway subgrade. Background Art

[0002] Soil moisture content is a key physical parameter that influences engineering properties, and its changes directly impact the strength and stability of the roadbed. Real-time monitoring of high-speed railway subgrade moisture content is essential. Currently, there are numerous methods for measuring soil moisture content, including drying, alcohol combustion, specific gravity, neutron metering, and time-domain reflectometry. For example, a soil moisture measurement device is described in prior art with publication number CN218727249U.

[0003] High-speed railway subgrades often require continuous, rapid, and undisturbed soil moisture testing. However, current soil moisture measurement methods cannot meet these requirements. Therefore, developing a continuous, undisturbed, accurate, reliable, and real-time soil moisture measurement system is of great engineering significance. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides an in-situ monitoring system for the moisture content of a high-speed railway subgrade, which can realize continuous, undisturbed, accurate and reliable in-situ monitoring of the moisture content of the soil in real time.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an in-situ monitoring system for the moisture content of a high-speed railway subgrade, comprising a stainless steel protective cover, a camera being provided inside the stainless steel protective cover, a transparent glass diaphragm being provided at the front end of the stainless steel protective cover, a front end cover being fixedly provided at the outer end of the transparent glass diaphragm, the front end cover being provided at the front end of the stainless steel protective cover, and the front end cover being capable of being disassembled and separated from the stainless steel protective cover.

[0006] The camera lens faces the transparent glass diaphragm, a water-absorbing test paper is provided on the front side of the transparent glass diaphragm, two fill lights are provided on the camera lens, and the fill lights emit light to illuminate the transparent glass diaphragm, thereby playing a fill light role. A moving component for driving the camera to move back and forth is provided at the bottom of the camera. The movement of the camera can adjust the distance between the camera lens and the water-absorbing test paper. The moving component is provided with a displacement sensor that moves synchronously with the camera.

[0007] The rear end of the stainless steel protective cover is provided with a detachable rear end cover, and the rear end of the rear end cover is fixedly provided with a controller. The camera and displacement sensor are arranged at the input end of the controller, and the fill light is arranged at the output end of the controller, so that the controller can control the brightness change of the fill light.

[0008] In a preferred embodiment, a GPS wireless communication module is fixedly provided at the rear end of the rear end cover, and a detachable closing cover is provided on the rear side of the rear end cover. The GPS wireless communication module and the controller are both arranged inside the closing cover, and the GPS wireless communication module is arranged at the connection end of the controller. The controller can be remotely wirelessly connected to the computer through the GPS wireless communication module, thereby using the computer to control the monitoring system and transmit the images taken by the camera to the computer.

[0009] In a preferred embodiment, two elastic strips made of rubber are fixedly provided at the front end of the front end cover, and the water absorbent test paper is clamped between the elastic strips and the transparent glass membrane. Two pressure blocks in contact with the water absorbent test paper are fixed on the side of the elastic strip facing the water absorbent test paper. The elastic strip is in a taut state and the water absorbent test paper is pressed and fixed to the front side of the transparent glass membrane by the pressure blocks.

[0010] In a preferred embodiment, a support plate is provided at the bottom of the camera, and two fixing plates are fixed on both sides of the support plate. The bottom end of the fixing plate is rotatably connected to a roller, and the roller contacts the inner wall of the stainless steel protective cover. The roller can roll on the inner wall of the stainless steel protective cover, making the movement of the support plate smoother.

[0011] In a preferred embodiment, the moving component includes a sliding channel fixed at the bottom end of the stainless steel protective cover, a slider is provided inside the sliding channel, and both sides of the slider are in contact with the inner wall of the sliding channel, so that it can move in a straight line inside the sliding channel. The top of the slider extends to the inside of the stainless steel protective cover and is fixedly connected to the bottom end of the support plate, and the displacement sensor is arranged on the rear side of the slider.

[0012] In a preferred embodiment, a detachable bottom plate is fixedly provided at the bottom end of the sliding channel, a threaded rod is provided on the slider, which passes through the slider and is connected to the slider by a thread, one end of the threaded rod is rotatably connected to the inner wall of the sliding channel, a driving motor for driving the threaded rod to rotate is fixedly provided on the inner wall of the sliding channel, the other end of the threaded rod is fixedly connected to the output shaft of the driving motor, and the driving motor is arranged at the output end of the controller.

[0013] The technical effects and advantages of the utility model are as follows: the utility model absorbs soil moisture through water-absorbing test paper and causes color change, and then uses a camera to capture an image of the water-absorbing test paper under a suitable light environment. Finally, a computer analyzes the image of the water-absorbing test paper to obtain the soil moisture content, thereby realizing continuous, undisturbed, accurate and reliable real-time in-situ monitoring of soil moisture content, which is more suitable for detecting the moisture content of high-speed railway subgrade soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is the overall structural diagram of the utility model;

[0016] Figure 2 It is a cross-sectional view of the utility model;

[0017] Figure 3 This is a structural diagram of a camera of the present utility model;

[0018] Figure 4 This is a structural diagram of the front end cover and water-absorbing test paper of the present utility model;

[0019] Figure 5 This is a system diagram of the present utility model.

[0020] The accompanying drawings are marked as follows: 1. Stainless steel protective cover; 101. Front cover; 102. Rear cover; 2. Water-absorbing test paper; 3. Transparent glass diaphragm; 4. Displacement sensor; 5. Elastic strip; 6. Camera; 7. Fill light; 8. Moving component; 801. Sliding channel; 802. Threaded rod; 803. Bottom plate; 804. Slider; 805. Drive motor; 9. Enclosed cover; 10. GPS wireless communication module; 11. Controller; 12. Support plate; 13. Fixed plate; 14. Roller. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Refer to the instruction manual Figure 1-5In this embodiment, an in-situ monitoring system for the moisture content of a high-speed railway subgrade includes a stainless steel protective cover 1. A camera 6 is provided inside the stainless steel protective cover 1. The camera 6 can be an industrial camera on the market, such as the second-generation Mercury 2 industrial camera, model MER2-503-23GM / C. A transparent glass diaphragm 3 is provided at the front end of the stainless steel protective cover 1. A front end cover 101 is fixed to the outer end of the transparent glass diaphragm 3. The front end cover 101 is provided at the front end of the stainless steel protective cover 1. The front end cover 101 can be disassembled and separated from the stainless steel protective cover 1. The camera 6 is enclosed inside the stainless steel protective cover 1 and the stainless steel protective cover 1 is buried as a whole in the soil to be detected.

[0023] In order to reflect the moisture content of the soil, the lens of the camera 6 is facing the transparent glass membrane 3. A water-absorbing test paper 2 is provided on the front side of the transparent glass membrane 3. The water-absorbing test paper 2 is in full contact with the soil and absorbs moisture in the soil. The more moisture absorbed, the darker the color of the water-absorbing test paper 2 will be. Therefore, the color depth of the water-absorbing test paper 2 reflects the moisture content of the soil. Two fill lights 7 are provided on the lens of the camera 6. The fill lights 7 emit light to illuminate the transparent glass membrane 3, thereby playing a fill light role. A moving component 8 is provided at the bottom of the camera 6 for driving the camera 6 to move back and forth. The movement of the camera 6 can adjust the distance between the lens of the camera 6 and the water-absorbing test paper 2. The moving component 8 is provided with a displacement sensor 4 that moves synchronously with the camera 6. The camera 6 is driven back and forth by the moving component 8 to adjust the distance between the camera 6 and the water-absorbing test paper 2 to an appropriate distance so as to capture an image. At this time, the fill lights 7 illuminate the water-absorbing test paper 2 forward, and the lens of the camera 6 can shoot the water-absorbing test paper 2 through the transparent glass membrane 3, thereby obtaining an image of the water-absorbing test paper 2.

[0024] The rear end of the stainless steel protective cover 1 is provided with a detachable rear end cover 102, and the rear end of the rear end cover 102 is fixedly provided with a controller 11. The camera 6 and the displacement sensor 4 are provided at the input end of the controller 11, and the fill light 7 is provided at the output end of the controller 11. Therefore, the controller 11 can control the brightness change of the fill light 7. The image captured by the camera 6 is transmitted to the controller 11 and further processed by the controller 11. In the process of adjusting the position of the camera 6 back and forth, the displacement sensor 4 moves synchronously with it and senses the position change of the camera 6. The displacement sensor 4 uses this as a basis to control the brightness of the fill light 7 through the controller 11. The larger the distance between the lens of the camera 6 and the water-absorbing test paper 2, the greater the brightness of the fill light 7, and vice versa. In this way, the fill light intensity of the test paper can be dynamically adjusted to obtain a sufficiently clear test paper image.

[0025] Preferably, the controller 11 selects Siemens' S7-200, whose internal digital output module can be used to control the switch of the fill light 7. It supports the camera 6 to communicate via Ethernet or serial port, and then an embedded processor and corresponding OpenCV image processing software can be selected to process the image; the GPS wireless communication module is used to send the image processing results, which is a conventional technology.

[0026] The collected images need to be transmitted and further processed. A GPS wireless communication module 10 is fixed at the rear end of the rear end cover 102, and a detachable closing cover 9 is provided on the rear side of the rear end cover 102. The GPS wireless communication module 10 and the controller 11 are both arranged inside the closing cover 9. The GPS wireless communication module 10 is arranged at the connection end of the controller 11. The controller 11 can be remotely wirelessly connected to the computer through the GPS wireless communication module 10, so as to use the computer to control the monitoring system and transmit the image taken by the camera to the computer. The GPS wireless communication module 10 and the controller 11 are protected inside the closing cover 9, and the image collected by the camera 6 is transmitted to the controller 11, and then wirelessly transmitted to the computer by the GPS wireless communication module 10. The computer analyzes the image of the water-absorbing test paper 2 through the built-in software, and obtains the moisture content of the soil. The computer software analyzes the image and obtains the moisture content, which is an existing mature technology.

[0027] In order to tightly fix the water absorbent test paper 2 on the front side of the transparent glass diaphragm 3, two elastic strips 5 made of rubber are fixedly provided at the front end of the front end cover 101. The water absorbent test paper 2 is clamped between the elastic strips 5 and the transparent glass diaphragm 3. Two pressing blocks in contact with the water absorbent test paper 2 are fixed on the side of the elastic strip 5 facing the water absorbent test paper 2. The elastic strip 5 is in a taut state and presses the water absorbent test paper 2 to the front side of the transparent glass diaphragm 3 through the pressing blocks. The elastic force of the elastic strip 5 is applied to the pressing blocks, causing the pressing blocks to squeeze backward, thereby clamping the water absorbent test paper 2 to the front side of the transparent glass diaphragm 3, so that the water absorbent test paper 2 is close to the transparent glass diaphragm 3 to prevent it from falling off.

[0028] In order to support and fix the camera 6 inside the stainless steel protective cover 1, a support plate 12 is provided at the bottom end of the camera 6, and two fixing plates 13 are fixed on both sides of the support plate 12. The bottom end of the fixing plate 13 is rotatably connected to a roller 14, and the roller 14 is in contact with the inner wall of the stainless steel protective cover 1. The roller 14 can roll on the inner wall of the stainless steel protective cover 1, so that the movement of the support plate 12 is smoother. The moving component 8 drives the support plate 12 to move inside the stainless steel protective cover 1, and the support plate 12 remains in a horizontal state. The rollers 14 on both sides are in contact with the inner wall of the stainless steel protective cover 1, thereby supporting the support plate 12. At the same time, when the support plate 12 moves, the roller 14 can roll on the inner wall of the stainless steel protective cover 1, reducing the resistance of the support plate 12 during movement.

[0029] In order to make the camera 6 move forward and backward in a straight line, the moving component 8 includes a sliding channel 801 fixed at the bottom end of the stainless steel protective cover 1, and a slider 804 is provided inside the sliding channel 801. The two sides of the slider 804 are in contact with the inner wall of the sliding channel 801, so that it can move in a straight line inside the sliding channel 801. The top of the slider 804 extends to the inside of the stainless steel protective cover 1 and is fixedly connected to the bottom end of the support plate 12. The displacement sensor 4 is provided on the rear side of the slider 804. The slider 804 is connected to the bottom end of the support plate 12, and the slider 804 moves forward and backward in a straight line along the sliding channel 801, so that the support plate 12 and the camera 6 can move forward and backward in a straight line.

[0030] In order to drive the slider 804 to move, a detachable bottom plate 803 is fixed to the bottom end of the sliding channel 801. Removing the bottom plate 803 can facilitate the inspection and maintenance of the components inside the sliding channel 801. The slider 804 is provided with a threaded rod 802 that passes through the slider 804 and is connected to the slider 804 by a thread. One end of the threaded rod 802 is rotatably connected to the inner wall of the sliding channel 801. A driving motor 805 for driving the threaded rod 802 to rotate is fixed on the inner wall of the sliding channel 801. The other end of the threaded rod 802 is fixedly connected to the output shaft of the driving motor 805. The driving motor 805 is arranged at the output end of the controller 11. Under the control of the controller 11, the driving motor 805 drives the threaded rod 802 to rotate. Under the action of the thread, the slider 804 is driven to move. The driving motor 805 can rotate clockwise or counterclockwise. By adjusting the direction of rotation, the direction of movement of the slider 804 can be controlled, thereby controlling the camera 6 to move forward or backward.

[0031] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A high-speed railway subgrade moisture content in-situ monitoring system, comprising a stainless steel protective cover (1), characterized in that: A camera (6) is provided inside the stainless steel protective cover (1), a transparent glass diaphragm (3) is provided at the front end of the stainless steel protective cover (1), a front end cover (101) is fixedly provided at the outer end of the transparent glass diaphragm (3), and the front end cover (101) is provided at the front end of the stainless steel protective cover (1); The lens of the camera (6) faces the transparent glass membrane (3), a water-absorbing test paper (2) is provided on the front side of the transparent glass membrane (3), two fill lights (7) are provided on the lens of the camera (6), a moving component (8) for driving the camera (6) to move forward and backward is provided at the bottom of the camera (6), and a displacement sensor (4) that moves synchronously with the camera (6) is provided on the moving component (8).

2. The high-speed railway subgrade moisture content in-situ monitoring system according to claim 1, characterized in that: The rear end of the stainless steel protective cover (1) is provided with a detachable rear end cover (102), the rear end of the rear end cover (102) is fixedly provided with a controller (11), the camera (6) and the displacement sensor (4) are provided at the input end of the controller (11), and the fill light (7) is provided at the output end of the controller (11); A GPS wireless communication module (10) is fixedly provided at the rear end of the rear end cover (102), a detachable closing cover (9) is provided at the rear side of the rear end cover (102), and the GPS wireless communication module (10) and the controller (11) are both provided inside the closing cover (9).

3. The high-speed railway subgrade moisture content in-situ monitoring system according to claim 1, characterized in that: Two elastic strips (5) made of rubber are fixedly provided at the front end of the front cover (101); the water-absorbing test paper (2) is sandwiched between the elastic strips (5) and the transparent glass membrane (3); and two pressing blocks in contact with the water-absorbing test paper (2) are fixedly provided on the side of the elastic strip (5) facing the water-absorbing test paper (2).

4. The high-speed railway subgrade moisture content in-situ monitoring system according to claim 2, characterized in that: The bottom end of the camera (6) is provided with a support plate (12), two fixing plates (13) are fixedly provided on both sides of the support plate (12), and the bottom end of the fixing plate (13) is rotatably connected to a roller (14), and the roller (14) is in contact with the inner wall of the stainless steel protective cover (1).

5. The high-speed railway subgrade moisture content in-situ monitoring system according to claim 4, characterized in that: The moving assembly (8) comprises a sliding channel (801) fixedly arranged at the bottom end of the stainless steel protective cover (1), a slider (804) being provided inside the sliding channel (801), the top end of the slider (804) extending into the interior of the stainless steel protective cover (1) and being fixedly connected to the bottom end of the support plate (12), and the displacement sensor (4) being provided at the rear side of the slider (804).

6. The high-speed railway subgrade moisture content in-situ monitoring system according to claim 5, characterized in that: A detachable bottom plate (803) is fixedly provided at the bottom end of the sliding channel (801), a threaded rod (802) is provided on the slider (804) and is threadedly connected to the slider (804), and a driving motor (805) for driving the threaded rod (802) to rotate is fixedly provided on the inner wall of the sliding channel (801), and the driving motor (805) is provided at the output end of the controller (11).

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