Multifunctional cleat for bridge vibration monitoring and monitoring method

Abstract

The application discloses a multifunctional stud for bridge vibration monitoring and a monitoring method, which comprises a monitoring end and a transceiving end, the vehicle-approaching surface of the monitoring end is provided with a vehicle warning part, and the vehicle-receding surface is provided with a vibration monitoring part; the vibration monitoring part is provided with a first inner cavity with an open bottom, the vehicle-receding surface light-transmitting glass is arranged on the outer side of the first inner cavity, the inner side of the vehicle-receding surface light-transmitting glass is provided with a polarization device, and the lower part is provided with a photoelastic test buckle; the transceiving end comprises a light source for emitting a monitoring light beam to the vehicle-receding surface light-transmitting glass and a camera device for collecting the emitted light beam; the side surface of the first inner cavity opposite to the vehicle-receding surface light-transmitting glass is provided with a mirror surface sticker, the mirror surface sticker is arranged to reflect the monitoring light beam to the photoelastic test buckle; the bottom of the photoelastic test buckle is coated with a reflective coating, and the reflective coating reflects the monitoring light beam to the mirror surface sticker and the camera device. The multifunctional stud can statistically analyze the stress of each measuring point on the bridge deck, and realize the visualization of the overall state of the bridge vibration.

Description

Technical Field

[0001] This invention relates to the fields of optical elasticity, particle mechanics, and bridge deck vibration detection technology, specifically to a multifunctional road stud and monitoring method for bridge vibration monitoring. Background Technology

[0002] The photoelastic experimental method is based on the polarized light field formed by polarizers and quarter-wave plates. A particle sample with birefringence is placed in such a polarized light field, and interference fringes are generated when the particle sample is loaded, thus forming intuitive stress fringes. Subsequently, the magnitude of the stress is analyzed by the light intensity information of the differential fringes in the image, so as to realize the visualization of stress.

[0003] The photoelastic test finger is made of transparent particles made of materials with birefringence, such as epoxy resin or polycarbonate. When a load is applied to this material with temporary birefringence in a polarized light field, it will produce alternating bright and dark stripes. The stripes will disappear after the load is removed.

[0004] The polarized light field is formed by a polarizer (first polarizer) first allowing polarized light from the light source, which is in the same direction as the polarization axis, to pass through and form linearly polarized light. When the light continues to pass through the first quarter-wave plate, the linearly polarized light will generate a phase difference and form circularly polarized light or elliptically polarized light. When passing through a particle sample with birefringence, the light wave will be decomposed into two types of polarized light with mutually perpendicular vibration directions, different propagation speeds, and different refractive indices. Since polarized light cannot be detected by the naked eye, a second quarter-wave plate and an analyzer (second polarizer) are needed to capture and inspect the polarized light, thus forming the polarized light field required for our photoelastic experiment.

[0005] Current bridge deck vibration detection technology has many limitations. When observing the bridge deck from a distance, its accuracy is difficult to meet the requirements. Surface measurement methods cannot reflect the internal forces and dynamic deformation characteristics of the bridge deck. Measurement methods also have the disadvantages of being time-consuming, labor-intensive, and costly.

[0006] Currently, road studs are equipped with luminous devices on both the front and rear sides. Since the rear side cannot be seen by passing vehicles, it cannot serve as a road guide, thus reducing the utilization rate of the space on the rear side of the road studs. Summary of the Invention

[0007] The purpose of this invention is to provide a multifunctional road spike and monitoring method for bridge vibration monitoring. This multifunctional road spike and monitoring method can perform the functions of traditional road spikes on the front side while measuring the stress at specific measurement points on the back side of the bridge. Statistical analysis of all measurement points can present the overall stress state of the bridge and realize the visualization of bridge vibration.

[0008] To achieve the above objectives, the present invention provides a multifunctional road stud for bridge vibration monitoring. The multifunctional road stud includes a monitoring end and a transceiver end. The front face of the monitoring end is configured as a vehicle warning section, and the rear face is configured as a vibration monitoring section. The vibration monitoring section has a first inner cavity with an open bottom. A translucent glass for the rear face is located on the outward-facing side of the first inner cavity. A polarizing device is located on the inner side of the translucent glass for the rear face. A photoelastic test buckle is located below the first inner cavity. The transceiver end includes a light source for emitting a monitoring beam to the translucent glass for the rear face and a camera device for collecting the emitted beam. A mirror sticker is located on the side of the first inner cavity opposite to the translucent glass for the rear face. The mirror sticker is configured to reflect the monitoring beam to the photoelastic test buckle. The bottom of the photoelastic test buckle is coated with a reflective coating, which is used to reflect the monitoring beam to the mirror sticker and the camera device.

[0009] Preferably, the vehicle warning section is provided with a second inner cavity, and a light-transmitting glass facing the vehicle is provided on the outward side of the second inner cavity, and a reflective sticker is provided on the side of the second inner cavity opposite to the light-transmitting glass facing the vehicle.

[0010] Preferably, the bottom of the second inner cavity is provided with an LED light panel and a platform for mounting the LED light panel, and the bottom of the platform is provided with nail feet.

[0011] Preferably, a solar panel is embedded in the top of the monitoring terminal, and the solar panel is electrically connected to the LED light panel to supply power to the LED light panel.

[0012] Preferably, a square mounting groove is provided on the inner side of the back-side light-transmitting glass, and an open socket is provided at the upper end of the square mounting groove. A polarizer and a quarter-wave plate are inserted into the socket, wherein the polarizer is located on the outer side.

[0013] Preferably, the photoelastic test buckle is made of a material with birefringence properties, and the reflective coating is silver paint.

[0014] Preferably, the monitoring terminal includes an upper cover and a lower cover, wherein a partition is provided in the middle of the upper cover to divide the interior of the upper cover into a first inner cavity and a second inner cavity.

[0015] Preferably, the front and rear sides of the upper cover box are respectively provided with trapezoidal inserts for installing the front and rear light-transmitting glass.

[0016] Preferably, the upper cover box has upper nut holes on its left and right sides, and the lower box has lower nut holes corresponding to the upper nut holes.

[0017] Another aspect of the present invention provides a monitoring method for bridge vibration monitoring, the monitoring method comprising the following steps:

[0018] 1) Select monitoring points for bridges that require deck vibration testing;

[0019] 2) Drill holes in the bridge deck at the monitoring points and embed the photoelastic test clips in the drilled holes;

[0020] 3) Fix the monitoring end at the monitoring point position, and make the position of the mirror sticker correspond to the position of the photoelastic test buckle;

[0021] 4) Use a light source to emit a beam of light towards the mirror sticker and reflect it to the photoelastic test buckle. Monitor the beam as it is reflected by the reflective coating to the camera device;

[0022] 5) Take a picture of the photoelastic test buckle displayed on the mirror surface using a camera device;

[0023] 6) Analyze the color changes of the photographs taken for the photoelastic test, and calculate the stress on the bridge surface at the test point using the average color gradient method;

[0024] 7) By summarizing and statistically analyzing the stress at all detection points, the overall stress distribution of the bridge deck can be obtained, thereby achieving the effect of visualizing bridge deck vibration detection.

[0025] According to the above technical solution, the multifunctional road spike and monitoring method for bridge vibration monitoring in this invention can achieve the function of traditional road spikes on the front side, while measuring the stress at specific measurement points on the back side of the bridge. Statistical analysis of all measurement points can present the overall stress state of the bridge and realize the visualization of bridge vibration.

[0026] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a structural schematic diagram of a preferred embodiment of a multi-functional rail spike;

[0029] Figure 2 This is a disassembly diagram of a preferred embodiment of the upper cover box;

[0030] Figure 3 A schematic diagram of a preferred embodiment of a bolt;

[0031] Figure 4This is a disassembly diagram of a preferred embodiment of the translucent glass on the rear side of the vehicle.

[0032] Figure 5 This is a schematic diagram of a preferred embodiment of the light-transmitting glass on the vehicle-facing side;

[0033] Figure 6 This is a schematic diagram of a preferred embodiment of the photoelastic testing buckle;

[0034] Figure 7 This is a disassembly diagram of a preferred embodiment of the lower box structure.

[0035] Explanation of reference numerals in the attached figures

[0036] 10-Light source; 20-Camera device; 30-Upper cover box; 31-Solar panel; 32-Mirror sticker; 33-Reflective sticker; 34-Upper nut hole; 35-Partition plate; 40-Bolt; 50-Back side translucent glass; 51-Square mounting slot; 52-Polarizing film; 53-1 / 4 wave plate; 60-Front side translucent glass; 70-Photoelastic test clip; 71-Silver paint; 80-Lower box; 81-Lower nut hole; 82-LED light panel; 83-Platform; 84-Nail foot. Detailed Implementation

[0037] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0038] In this invention, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside" in the terminology only represent the orientation of the term in its normal use or are common terms understood by those skilled in the art, and should not be regarded as a limitation on the term.

[0039] See Figure 1-7The multifunctional road stud shown is used for bridge vibration monitoring. It includes a monitoring end and a transceiver end. The front side of the monitoring end is configured as a vehicle warning section, and the rear side is configured as a vibration monitoring section. The vibration monitoring section has a first inner cavity with an open bottom. A translucent glass 50 for the rear side is located on the outward-facing side of the first inner cavity. A polarizing device is located on the inner side of the translucent glass 50. A photoelastic test clip 70 is located below the first inner cavity. The transceiver end includes a light source 10 that emits a monitoring beam to the translucent glass 50 and a camera device 20 for collecting the emitted beam. A mirror sticker 32 is located on the side of the first inner cavity opposite to the translucent glass 50, reflecting the monitoring beam to the photoelastic test clip 70. The bottom of the photoelastic test clip 70 is coated with a reflective coating, which reflects the monitoring beam to the mirror sticker 32 and the camera device 20.

[0040] Through the implementation of the above technical solution, the multifunctional road stud used for bridge vibration monitoring can perform the functions of traditional road studs on the front side, while its back side can measure the stress at specific measurement points on the bridge deck. Statistical analysis of all measurement points can present the overall stress state of the bridge, realizing the visualization of bridge vibration. In use, the light source 10 emits a beam of light towards the back side transparent glass 50. After passing through the polarization device, the beam hits the mirror sticker 32 and is reflected onto the photoelastic test buckle 70. The beam is then refracted back through the reflective coating on the bottom, and then passes through the mirror sticker 32, the polarization device, and the back side transparent glass 50 in sequence before being captured by the camera device 20.

[0041] For example, in one embodiment, the photoelastic test buckle 70 is vertically fixed to the bridge surface, the mirror sticker 32 extends obliquely upward at a 45° angle from bottom to top, and the light beam enters the first inner cavity from the horizontal direction.

[0042] In this embodiment, the vehicle warning unit has a second inner cavity. A light-transmitting glass 60 is provided on the outward-facing side of the second inner cavity, and a reflective sticker 33 is provided on the side of the second inner cavity opposite to the light-transmitting glass 60. The first and second inner cavities are isolated from each other and do not interfere with each other. The reflective sticker 33 in the second inner cavity can reflect the headlights of vehicles driving at night, providing a warning effect.

[0043] In this embodiment, an LED light panel 82 is provided at the bottom of the second inner cavity, and a platform 83 for mounting the LED light panel 82 is provided at the bottom of the platform 83. With this arrangement, when the reflective sticker 33 is not illuminated by vehicle headlights, the LED light panel 82 can emit light towards the reflective sticker 33, generating a certain brightness to guide the road and improve the warning effect. When vehicle headlights illuminate the reflective sticker 33, the brightness will increase, achieving a differentiated brightness display effect, thereby increasing driving safety. The nails 84 are used to fix the entire device in the corresponding drilled holes at the test points with epoxy resin.

[0044] In this embodiment, a solar panel 31 is embedded in the top of the monitoring terminal, and the solar panel 31 is electrically connected to the LED light panel 82 to supply power to the LED light panel 82. In one embodiment, the monitoring terminal includes an upper cover 30, in which a groove is provided for embedding the solar panel 31. The shape of the groove matches the solar panel 31 to provide power to the LED light panel 82.

[0045] In this embodiment, a square mounting slot 51 is provided on the inner side of the back-side translucent glass 50. An open insertion port is provided at the upper end of the square mounting slot 51, into which a polarizer 52 and a quarter-wave plate 53 are inserted. The polarizer 52 is positioned on the outermost side. The square mounting slot 51 facilitates the insertion and replacement of the polarizer 52 and quarter-wave plate 53.

[0046] In this embodiment, the photoelastic test buckle 70 is made of a material with birefringence properties, and the reflective coating is silver paint 71. The birefringent material, such as epoxy resin or polycarbonate, is cylindrical in shape.

[0047] In this embodiment, the monitoring end includes an upper cover 30 and a lower cover 80. A partition 35 is provided in the middle of the upper cover 30 to divide the interior of the upper cover 30 into a first inner cavity and a second inner cavity. This arrangement improves the detachability.

[0048] In this embodiment, the front and rear sides of the upper cover box 30 are respectively provided with trapezoidal inserts for installing the front-side transparent glass 60 and the rear-side transparent glass 50.

[0049] Specifically, such as Figure 2The upper cover box 30 is generally rectangular, with the front and rear sides, as well as the two adjacent other sides, being trapezoidal. The upper sides of the partition 35 are also set as bevels, which are used to attach the mirror sticker 32 and the reflective sticker 33, respectively. The trapezoidal design can increase the light transmission area while reducing the height. In addition, the front and rear sides of the upper cover box 30 are respectively provided with trapezoidal insertion openings for installing the front light-transmitting glass 60 and the rear light-transmitting glass 50. Slots are provided on both sides of the trapezoidal insertion openings.

[0050] The shape of the back-side light-transmitting glass 50 is set as a trapezoid corresponding to the trapezoidal insertion port. It enters from the lower opening through the trapezoidal insertion port of the upper cover box 30 and stops at the upper closed opening. It is connected to the upper cover box 30 and is abutted by the edge of the lower box 80 to prevent the back-side light-transmitting glass 50 from sliding. In addition, a square placement groove 51 is provided on the inner side of the back-side light-transmitting glass 50 for placing a circular polarizing device composed of a polarizer 52 and a quarter-wave plate 53.

[0051] The solar panel 31 in the upper cover box 30 is embedded in a groove with a matching shape on the top of the upper cover box 30 to provide power to the LED light panel 8282; the mirror sticker 32 is set in a trapezoidal shape and is affixed to the trapezoidal inclined surface inside the rear side of the upper cover box 30 to reflect the external polarized light source 10 onto the photoelastic test buckle 70; the reflective sticker 33 is set in a trapezoidal shape and is affixed to the trapezoidal inclined surface inside the front side of the upper cover box 30 to reflect the light from the LED light panel 82, and can also reflect vehicle lights at night; a partition 35 is provided in the middle of the upper cover box 30 to block the front side and rear side of the monitoring device, dividing them into two spaces, in order to prevent the light from the LED light panel 82 from affecting the presentation effect of the stress light intensity information of the photoelastic test buckle 70.

[0052] In this embodiment, upper nut holes 34 are provided on the left and right sides of the upper cover box 30, and lower nut holes 81 corresponding to the upper nut holes 34 are provided on the lower box 80. Bolts 40 are connected to the corresponding lower nut holes 81 on both sides of the lower box 80 through the upper nut holes 34 located on the concave arc surfaces on both sides of the upper cover box 30. With this arrangement, the upper cover box 30 and the lower box 80 can be connected together to form a whole by bolts 40.

[0053] In this invention, the silver paint 71 is used to reflect the polarized light from the mirror sticker 32 back to the incident light path through the original optical path.

[0054] Compared with existing technologies, the multifunctional road stud described in this invention retains the functions of traditional road studs, such as guiding the road, reflecting vehicle lights, and warning drivers, while addressing the issue of insufficient space utilization on the back side of traditional road studs. This allows for a direct visualization of the internal forces at specific measuring points on the bridge deck, and enables an assessment of the overall bridge deck condition by statistically analyzing the internal forces at all measuring points. Furthermore, the cost is relatively low. Specifically:

[0055] The monitoring end of the multifunctional road stud in this invention no longer resembles a traditional road stud. Instead, it becomes a multifunctional road stud for bridge vibration monitoring. The bottom of the lower box 80 on the back surface lacks a platform 83; instead, it connects to the bridge deck to embed a photoelastic test clip 70. When the photoelastic test clip 70 is compressed by the load on the bridge deck in a polarized light field, it produces stripes reflecting stress intensity information. These stripes can be used to calculate the stress on the photoelastic test clip 70 using the average color gradient method. However, applying the photoelastic experimental principle within the limited space of the back surface requires… To improve the formation of the polarized light field, the light field formation no longer relies on the distribution of a polarizer, a first quarter-wave plate 53, a second quarter-wave plate 53, and an analyzer. By applying a mirror sticker 32 and silver paint 71 to the bottom surface of the photoelastic test clip 70, the light source 10 can pass through two polarizers 52 and quarter-wave plates 53 in the same light path reflection. In this way, only one polarizer 52 and one quarter-wave plate 53 are needed to realize the polarized light field, which greatly saves the space of the back surface, improves the space utilization of the back surface, and realizes the dual function of guiding road and bridge vibration detection.

[0056] The multifunctional road spike of this invention improves upon the insufficient space utilization of the back surface of traditional road spikes. It can be widely used in the field of bridge deck vibration detection, and can intuitively present the internal forces at specific measuring points on the bridge deck. It can also evaluate the overall state of the bridge deck by statistically analyzing the internal forces at all measuring points on the bridge deck. Moreover, the cost is relatively low, thus solving the problems mentioned in the background art and improving its limitations.

[0057] Another aspect of the present invention provides a monitoring method for bridge vibration monitoring, the monitoring method comprising the following steps:

[0058] 1) Select monitoring points for bridges that require deck vibration testing;

[0059] 2) Drill holes in the bridge deck at the monitoring points and embed the photoelastic test clip 70 in the drilled holes;

[0060] 3) Fix the monitoring end at the monitoring point position, and make the position of the mirror sticker 32 correspond to the position of the photoelastic test buckle 70;

[0061] 4) Use light source 10 to emit a beam of light towards mirror sticker 32 and reflect it to photoelastic test buckle 70, and monitor the beam of light reflected by the reflective coating to camera device 20;

[0062] 5) The photoelasticity test buckle 70 presented on the mirror sticker 32 is photographed using the camera device 20;

[0063] 6) Analyze the color changes of the photographs taken for the photoelastic test, and calculate the stress on the bridge surface at the test point using the average color gradient method;

[0064] 7) By summarizing and statistically analyzing the stress at all detection points, the overall stress distribution of the bridge deck can be obtained, thereby achieving the effect of visualizing bridge deck vibration detection.

[0065] In one implementation, the steps are as follows: First, the photoelastic test clip 70 is embedded in the test point hole; second, the monitoring multi-functional road stud is fixed to the bridge deck with epoxy resin using the stud foot 84; third, the front side retains the traditional road stud function of guiding the road and warning vehicles and their drivers; fourth, the rear side analyzes the light intensity information displayed by the load on the embedded photoelastic test clip 70 through the bridge deck, which can determine the vibration state of the bridge deck.

[0066] The specific operation steps of this embodiment are as follows:

[0067] 1) For bridges that require deck vibration testing, assess the entire length of the bridge deck and select an appropriate number of measurement points based on the assessment results to ensure that the overall condition of the bridge can be reflected by the stress status of each measurement point.

[0068] 2) Based on the selected number of measurement points, count and prepare the number of monitoring devices and photoelastic test clips 70;

[0069] 3) Drill holes at each detection point on the bridge deck, and then embed the photoelastic test buckle 70 in the drilled holes so that it can be perfectly subjected to the load of the bridge deck. This will make the light intensity information reflected by the photoelastic test buckle 70 under load in the polarized light field easier for subsequent stress analysis.

[0070] 4) Measure the most suitable distance for the pin 84 of the monitoring device near the detection point of the photoelastic test buckle 70 and drill a hole at this position to ensure that the photoelastic test buckle 70 can be accurately placed at the center of the back surface of the device lower box 80 so that the light source 10 can accurately return through the incident light path after illumination. Then, place the pin 84 in the hole and fix the device with epoxy resin.

[0071] 5) After the monitoring device is installed, the solar panel 31 on the top of the upper cover 30 can power the LED light panel 82 in the lower box 80. The light emitted by the LED light panel 82 will be reflected to the outside of the device through the reflective sticker 33 to guide the vehicle. In addition to reflecting the light emitted by the LED light panel 82, the reflective sticker 33 can also reflect the vehicle's headlights at night or when visibility is low, so as to guide the vehicle and warn the driver.

[0072] 6) Align the light source 10 with the mirror sticker 32 on the back of the monitoring device, so that the light source 10 passes through the light-transmitting glass 50 on the back of the device, and at the same time passes through the polarizer 52 and the quarter-wave plate 53 placed in the square mounting slot 51 inside it, and then is reflected by the mirror sticker 32 onto the photoelastic test buckle 70, and then returns through the incident light path through the silver spray paint 71 coated on the bottom of the photoelastic test buckle 70.

[0073] 7) Place the camera device 20 in the light reflection path and photograph the stress stripes produced by the birefringence effect of the photoelastic test buckle 70 under the bridge deck compression load presented on the mirror sticker 32.

[0074] 8) Analyze the color changes of stress stripes in the photographs of the photoelastic test buckle 70, and estimate the stress on the bridge surface at the test point using the average color gradient method;

[0075] 9) By summarizing and statistically analyzing the stress at all detection points, the overall stress distribution of the bridge deck can be obtained, thereby achieving the effect of bridge deck vibration detection.

[0076] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0077] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0078] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A multifunctional rail spike for bridge vibration monitoring, characterized in that, The multi-functional road stud includes a monitoring end and a transceiver end. The front side of the monitoring end is configured as a vehicle warning part, and the rear side is configured as a vibration monitoring part. The vibration monitoring unit is provided with a first inner cavity with an open bottom. A back-side light-transmitting glass (50) is provided on the outward side of the first inner cavity. A polarization device is provided on the inner side of the back-side light-transmitting glass (50). A photoelastic test buckle (70) is provided below the first inner cavity. The transceiver includes a light source (10) that emits a monitoring beam into the back-side transparent glass (50) and a camera device (20) for collecting the emitted beam. A mirror sticker (32) is provided on the side opposite to the back of the car's light-transmitting glass (50) in the first inner cavity. The mirror sticker (32) is configured to reflect the monitoring beam to the photoelastic test buckle (70). The bottom of the photoelastic test buckle (70) is coated with a reflective coating, which is used to reflect the monitoring beam onto the mirror sticker (32) and the camera device (20); The inner side of the back-side light-transmitting glass (50) is provided with a square mounting groove (51), and the upper end of the square mounting groove (51) is provided with an open socket. A polarizer (52) and a quarter-wave plate (53) are inserted into the socket, wherein the polarizer (52) is located on the outer side. The monitoring terminal includes an upper cover (30) and a lower cover (80). A partition (35) is provided in the middle of the upper cover (30) to divide the interior of the upper cover (30) into a first inner cavity and a second inner cavity. The vehicle warning section is provided with a second inner cavity, and a light-transmitting glass (60) for the front face is provided on the outward side of the second inner cavity. A reflective sticker (33) is provided on the side of the second inner cavity opposite to the light-transmitting glass (60). The bottom of the second inner cavity is provided with an LED light panel (82) and a platform (83) for mounting the LED light panel (82), and the bottom of the platform (83) is provided with nail feet (84). The bottom of the back panel box (80) does not have a platform (83), but is connected to the bridge surface. This is to embed the photoelastic test buckle (70) on the bridge surface. The photoelastic test buckle (70) is squeezed by the load of the bridge surface in the polarized light field, which will produce stripes that reflect stress light intensity information. The stress of the photoelastic test buckle (70) can be calculated by the average color gradient method.

2. The multifunctional rail spike for bridge vibration monitoring according to claim 1, characterized in that, A solar panel (31) is embedded in the top of the monitoring terminal. The solar panel (31) is electrically connected to the LED light panel (82) to supply power to the LED light panel (82).

3. The multifunctional rail spike for bridge vibration monitoring according to claim 1, characterized in that, The photoelastic test buckle (70) is made of a material with birefringence properties, and the reflective coating is silver paint (71).

4. The multifunctional rail spike for bridge vibration monitoring according to claim 1, characterized in that, The upper cover (30) has trapezoidal inlets on its front and rear sides for installing the front transparent glass (60) and the rear transparent glass (50).

5. The multifunctional rail spike for bridge vibration monitoring according to claim 1, characterized in that, The upper cover (30) is provided with upper nut holes (34) on the left and right sides, and the lower cover (80) is provided with lower nut holes (81) corresponding to the upper nut holes (34).

6. A monitoring method for bridge vibration monitoring, based on the multifunctional rail spike as described in any one of claims 1-5, characterized in that, The monitoring method includes the following steps: 1) Select monitoring points for bridges that require deck vibration testing; 2) Drill holes in the bridge surface at the monitoring points and embed the photoelastic test clip (70) in the drilled holes; 3) Fix the monitoring end at the monitoring point position, and make the position of the mirror sticker (32) correspond to the position of the photoelastic test buckle (70); 4) Use a light source (10) to emit a beam of light towards the mirror sticker (32) and reflect it to the photoelastic test buckle (70). Monitor the beam of light reflected by the reflective coating to the camera device (20). 5) Take a picture of the photoelastic test buckle (70) on the mirror sticker (32) using the camera device (20); 6) Analyze the color changes of the photographs of the photoelastic test buckle (70) and calculate the stress on the bridge surface at the monitoring point by means of the average color gradient method; 7) By summarizing and statistically analyzing the stress at all monitoring points, the overall stress distribution of the bridge deck can be obtained, thereby achieving the effect of visualizing bridge deck vibration detection.

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