A bridge detection system

Abstract

This invention provides a bridge inspection system, including a bridge inspection vehicle and a deflection detection component. The bridge inspection vehicle is slidably mounted along the longitudinal direction of the bridge. The deflection detection component includes a calculation unit, a transmitting and receiving unit mounted on the bridge inspection vehicle, a first reflector fixed to the bridge pier, and a second reflector fixed to the bottom of the beam at the point to be measured. The transmitting and receiving unit includes a transmitting subunit and a receiving subunit. The transmitting subunit emits a first emitted light; the receiving subunit receives a first reflected light, which is the light returning after the first emitted light passes through the first and second reflectors in sequence. The calculation unit determines the bridge deflection value based on the position where the receiving subunit receives the first reflected light. This invention has the advantages of integrated detection functions, convenient operation, and accurate detection results.

Description

Technical Field

[0001] This invention relates to the field of bridge deflection detection, and more particularly to a bridge detection system. Background Technology

[0002] With the rise of the transportation industry, the number of bridges entering a period of frequent maintenance is increasing, and the requirements for bridge safety monitoring and early warning facilities are also becoming more stringent. Bridge deflection detection is of paramount importance in bridge condition monitoring, and the technical condition assessment standards for highway bridges have clear standards for determining bridge deflection damage.

[0003] Currently, bridge deflection detection mainly employs methods such as leveling, total station measurement, and fixed-point measurement. Among these, leveling and total station measurements require manual measurement, resulting in high workload, low efficiency, and low measurement reliability. Fixed-point measurement is primarily used for extra-large bridges and is rarely employed in ordinary bridges. Some non-contact bridge deflection measurement methods suffer from drawbacks such as requiring excessive number of measurement points and inconvenient installation. Meanwhile, bridge inspection vehicles primarily serve as a mobile platform for manual inspection, and in terms of bridge condition monitoring, they only perform intelligent inspections of the bridge's appearance, failing to monitor crucial information such as bridge deflection, thus resulting in low utilization efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a bridge inspection system that integrates detection functions, is easy to operate, and provides accurate detection results.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0006] A bridge inspection system includes a bridge inspection vehicle and a deflection detection component. The bridge inspection vehicle is slidably mounted along the longitudinal direction of the bridge. The deflection detection component includes a calculation unit, a transmitting and receiving unit mounted on the bridge inspection vehicle, a first reflector fixed to a bridge pier, and a second reflector fixed to a test point at the bottom of the beam. The transmitting and receiving unit includes a transmitting subunit and a receiving subunit. The transmitting subunit emits a first emitted light, and the receiving subunit receives a first reflected light, which is the light returning after the first emitted light passes through the first reflector and the second reflector in sequence. The calculation unit determines the bridge deflection value based on the position where the receiving subunit receives the first reflected light.

[0007] As a further improvement to the above technical solution:

[0008] The transmitting subunit and the first reflector are arranged opposite each other in the horizontal direction. The first emitted light from the transmitting subunit is horizontally incident on the first reflector. The reflecting surface of the first reflector faces the second reflector. The reflecting surface of the second reflector is horizontally set. The second reflector receives the first reflected light from the first reflector and emits it to the receiving subunit.

[0009] The receiving subunit detects the incident position of the first reflected light and sends the incident position to the calculation unit; the calculation unit calculates the bridge deflection value based on the incident position and the reference position; the reference position is the position of the second reflected light received by the receiving subunit when the bridge does not deflect, and the second reflected light is the light returned after the second emitted light emitted by the transmitting subunit passes through the first reflector and the second reflector in sequence.

[0010] The formula for calculating the bridge deflection is as follows:

[0011]

[0012] In the formula, q is the bridge deflection value at the point to be measured, y is the vertical coordinate value of the reference position, y' is the vertical coordinate value of the incident position, and α is the angle between the first reflector and the horizontal plane.

[0013] The receiving subunit includes a photosensitive screen, and the angle between the photosensitive screen and the horizontal plane is 2(α-π).

[0014] The transmitting and receiving units are in multiple sets; the multiple sets of transmitting and receiving units are installed on the bridge inspection vehicle and arranged along the transverse direction of the bridge.

[0015] The bridge inspection system also includes a correction component to prevent the bridge inspection vehicle from tilting. The correction component includes two sets of correction detection units and a controller. The two sets of correction detection units are located on the drive frames on both sides of the bridge inspection vehicle. The correction detection units detect the offset information of the drive frames on both sides of the bridge inspection vehicle along the longitudinal direction of the bridge and send it to the controller. The controller calculates the displacement deviation value of the two drive frames based on the offset information and controls the moving speed of the drive frames.

[0016] Each set of the correction detection unit includes a transmitter and a receiver, which are diagonally arranged on the drive frames on both sides of the bridge inspection vehicle; the transmitters of the two sets of correction detection units are located on the same side of the drive frame, and the transmitter of one set of correction detection units and the receiver of the other set of correction detection units are arranged opposite each other along the transverse direction of the bridge; the offset information includes the distance value between the transmitter and receiver in the same set, and the controller is used to determine whether the drive frames on both sides are synchronized based on the two sets of distance values, and to calculate the displacement deviation value of the drive frames on both sides based on the two sets of distance values ​​when the drive frames on both sides are not synchronized.

[0017] The expression for calculating the displacement deviation of the two drive frames is as follows:

[0018] X = b·cos(θ) - M

[0019]

[0020] In the formula, X is the displacement deviation value of the two drive frames, a is the distance value between one set of transmitters and receivers, b is the distance value between another set of transmitters and receivers, M is the installation distance of the transmitters on the same side, and θ is the angle between the connecting side of the transmitter and receiver corresponding to b and the drive frame.

[0021] The correction detection unit is an electromagnetic wave detection unit or a wire sensing detection unit.

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] The deflection detection component of this invention comprises a transmitting and receiving unit, a first reflector, and a second reflector. The transmitting and receiving unit is mounted on a bridge inspection vehicle, the first reflector is fixed to the bridge pier, and the second reflector is fixed to the test point at the bottom of the beam. Its detection structure is simple and compact. Simultaneously, the first emitted light from the transmitting and receiving unit sequentially enters the first and second reflectors and then returns. This invention achieves the integration of the transmitting and receiving subunits onto the bridge inspection vehicle through two light reflections from the first and second reflectors, avoiding the problems of separate arrangements, numerous points, complex layouts, and inconvenient installation of test points. Furthermore, it integrates bridge deflection detection functionality into the basic carrying and detection functions of the bridge inspection vehicle, expanding its usability. Moreover, the transmitting and receiving unit, mounted on the bridge inspection vehicle, allows for rapid detection of different test points by moving the vehicle, greatly improving the convenience of bridge deflection detection. Simultaneously, the calculation unit determines the bridge deflection value based on the position of the first reflected light received by the receiving subunit, enabling automatic and rapid acquisition of the bridge deflection value, resulting in convenient operation and high work efficiency. Attached Figure Description

[0024] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0025] Figure 1 This is a structural diagram of the bridge inspection system of the present invention.

[0026] Figure 2 This is a diagram showing the positional relationship of the bridge detection system of the present invention in a specific application (bridge in non-deflection and deflection states).

[0027] Figure 3This is a diagram showing the positional relationship of the bridge detection system of the present invention (bridge in non-deflected and deflected states).

[0028] Figure 4 This is a diagram showing the positional relationship between the bridge inspection vehicle and the transmitting and receiving unit of this invention.

[0029] Figure 5 This is a top view of the bridge inspection vehicle of the present invention (with the two drive frames in synchronized state).

[0030] Figure 6 This is a top view of the bridge inspection vehicle of the present invention (with the two drive frames out of sync).

[0031] The labels in the diagram represent:

[0032] 1. Bridge inspection vehicle; 11. Drive frame; 12. Positioning and attitude determination component; 121. Positioning encoder; 2. Deflection detection component; 21. Transmitter and receiver unit; 211. Transmitter subunit; 212. Receiver subunit; 2121. Photosensitive screen; 22. First reflector; 23. Second reflector; 24. Calculation unit; 25. First emitted light; 26. First reflected light; 27. Second emitted light; 28. Second reflected light; 3. Correction component; 31. Correction detection unit; 311. Transmitter; 312. Receiver; 4. Pier; 5. Beam. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection of the present invention.

[0034] Figures 1 to 3 An embodiment of the bridge inspection system of the present invention is shown. The bridge inspection system includes a bridge inspection vehicle 1 and a deflection detection component 2. The bridge inspection vehicle 1 is slidably arranged along the longitudinal direction of the bridge. In this embodiment, the deflection detection component 2 includes a calculation unit 24, a transmitting and receiving unit 21, a first reflector 22, and a second reflector 23. The transmitting and receiving unit 21 is located on the bridge inspection vehicle 1, the first reflector 22 is fixedly mounted on the pier 4, and the second reflector 23 is fixedly mounted at the test point at the bottom of the beam 5. Its detection structure is simple and compact. The transmitting and receiving unit 21 includes a transmitting subunit 211 and a receiving subunit 212. The transmitting subunit 211 emits a first emitted light 25; the receiving subunit 212 receives a first reflected light 26, which is the light returning after the first emitted light 25 passes sequentially through the first reflector 22 and the second reflector 23. The calculation unit 24 determines the bridge deflection value based on the position of the first reflected light 26 received by the receiving subunit 212.

[0035] This invention integrates the transmitting subunit 211 and the receiving subunit 212 onto the bridge inspection vehicle 1 through two light reflections via the first reflector 22 and the second reflector 23. This avoids the problems of separate arrangement of the transmitting and receiving subunits 211 and 212, resulting in numerous and complex layouts and inconvenient installation of measuring points. Furthermore, it allows the bridge inspection vehicle 1 to integrate bridge deflection detection functionality in addition to basic carrying and detection functions, thus expanding its usability. The transmitting and receiving units 21, mounted on the bridge inspection vehicle 1, enable rapid detection of different test points by moving the vehicle, significantly improving the convenience of bridge deflection detection. Simultaneously, the calculation unit 24 determines the bridge deflection value based on the position of the first reflected light 26 received by the receiving subunit 212, allowing for automatic and rapid acquisition of the bridge deflection value, resulting in convenient operation and high work efficiency.

[0036] Furthermore, the transmitting and receiving unit 21 and the first reflector 22 are arranged opposite each other in the horizontal direction. The first emitted light 25 of the transmitting subunit 211 is horizontally incident on the first reflector 22. The reflecting surface of the first reflector 22 faces the second reflector 23, and the reflecting surface of the second reflector 23 is horizontally set. The second reflector 23 receives the first reflected light 26 of the first reflector 22 and reflects it to the receiving subunit 212. This ensures the reliability of deflection detection and has a simple structure and compact layout.

[0037] Further, the receiving subunit 212 detects the incident position of the first reflected light 26 and sends the incident position to the calculation unit 24; the calculation unit 24 calculates the bridge deflection value based on the incident position and the reference position; the reference position is the position of the second reflected light 28 received by the receiving subunit 212 when the bridge does not deflect, and the second reflected light 28 is the light returned by the second emitted light 27 emitted by the transmitting subunit 211 after passing through the first reflector 22 and the second reflector 23 in sequence.

[0038] Based on a complete change in the structure and setting position of the deflection detection component 2, this invention provides a method for calculating the bridge deflection value of the deflection detection component 2. That is, the bridge deflection value is determined by the reference position of the bridge when it is not deflected and the incident position of the bridge when it deflects, which is received by the receiving subunit 212. The position information is easy to obtain and the calculation method is simple and easy to implement.

[0039] In this embodiment, the expression for calculating the bridge deflection is:

[0040]

[0041] like Figure 3As shown in the formula, q is the bridge deflection value at the point to be measured, y is the vertical coordinate value of the reference position, y' is the vertical coordinate value of the incident position, and α is the angle between the first reflector 22 and the horizontal plane. This invention can obtain an accurate bridge deflection value using the vertical coordinate values ​​of the reference position, the incident position, and the angle between the first reflector 22 and the horizontal plane; simultaneously, it involves fewer parameters in the bridge deflection calculation, has low computational complexity, and is highly operable.

[0042] Furthermore, the receiving subunit 212 includes a photosensitive screen 2121. The photosensitive screen 2121 makes an angle of 2(α-π) with the horizontal plane, which ensures that the first reflected light 26 and the second reflected light 28 reflected back from the second reflector 23 are both perpendicular to the photosensitive screen 2121, so as to ensure that the bridge deflection value can be effectively obtained using the above calculation expression and to ensure the accuracy of the detection results.

[0043] like Figure 4 As shown, there are three sets of transmitting and receiving units 21. These three sets of units are mounted on the bridge inspection vehicle 1 and are arranged along the transverse direction of the bridge. When inspecting different test points at the bottom of the beam 5 (such as at 1 / 2 span, 1 / 4 span, etc.), the corresponding transmitting and receiving units 21 are used for deflection detection. Figure 2 The transmitting and receiving unit 21 is used to detect deflection at half the span of the bridge. Two other sets of transmitting and receiving units 21 can be used to detect deflection at a quarter span, allowing for convenient and rapid detection at different expansion points of the bridge. In other embodiments, the same transmitting and receiving unit 21 can be used, and the angle and height of the first reflector 22 can be adjusted to detect different test points at the bottom of the beam 5. Furthermore, the number of transmitting and receiving units 21 can be set according to the number of test points, such as four or five sets.

[0044] In this embodiment, the transmitting subunit 211 is a laser emitter, and the receiving subunit 212 is a spot detector. The laser emitter and the spot detector are integrated and arranged on the bridge inspection vehicle 1. Its structure is simple and compact, and occupies little space.

[0045] In this embodiment, the bridge inspection system further includes a correction component 3, which comprises two sets of correction detection units 31 and a controller. The two sets of correction detection units 31 are mounted on the drive frames 11 on both sides of the bridge inspection vehicle 1. The correction detection units 31 detect the offset information of the drive frames 11 on both sides of the bridge inspection vehicle 1 along the longitudinal direction of the bridge and send the offset information to the controller. The controller calculates the displacement deviation value of the two drive frames 11 based on the offset information and controls the moving speed of the drive frames 11. This ensures the synchronization of the drive frames 11 on both sides of the bridge inspection vehicle 1, effectively preventing the bridge inspection vehicle 1 from tilting. Consequently, the laser emitted by the laser emitter on the bridge inspection vehicle 1 always enters the first reflector plate 22 horizontally, ensuring that the laser does not deviate from the spot detector and guaranteeing smooth and reliable inspection.

[0046] Furthermore, such as Figure 5 and Figure 6 As shown, each set of correction detection units 31 includes a transmitter 311 and a receiver 312. The transmitters 311 and receivers 312 are diagonally arranged on the drive frames 11 on both sides of the bridge inspection vehicle 1. The transmitters 311 of the two sets of correction detection units 31 are located on the same side drive frame 11, and the transmitters 311 of one set of correction detection units 31 and the receivers 312 of the other set of correction detection units 31 are arranged opposite each other along the transverse direction of the bridge when the drive frames 11 are synchronized on both sides. Its correction detection structure is simple and occupies little space. In other embodiments, the transmitters 311 and receivers 312 of the same set of correction detection units 31 can be interchanged.

[0047] Simultaneously, the offset information includes the distance value between the transmitter 311 and receiver 312 in the same group; the controller is used to determine whether the drive frames 11 on both sides are synchronized based on the two sets of distance values, and when the drive frames 11 on both sides are not synchronized, the controller calculates the displacement deviation value of the drive frames 11 on both sides based on the two sets of distance values. This invention calculates the position deviation value by using distance values, which greatly improves the correction accuracy compared to the traditional travel encoder correction with accumulated errors; at the same time, the two sets of correction detection units 31 can test two sets of distance values, which enables the detection system to have accurate and timely correction function when the track gauge changes, and realizes the front and rear judgment of the drive frames 11 on both sides.

[0048] In this embodiment, the expression for calculating the displacement deviation value of the two drive frames 11 is as follows:

[0049] X = b·cos(θ) - M

[0050]

[0051] like Figure 6As shown in the formula, X is the displacement deviation value of the two drive frames 11; a is the distance value between one set of transmitters 311 and receivers 312; b is the distance value between another set of transmitters 311 and receivers 312; M is the installation distance of the transmitters 311 on the same side; θ is the angle between the connecting side of the transmitter 311 and receiver 312 corresponding to b and the drive frame 11.

[0052] Based on the structure of the correction detection unit 31, this invention provides a method for calculating the displacement deviation value of the drive frames 11 on both sides of the correction detection unit 31. Specifically, the deflection angle θ is calculated using two sets of distance values ​​a and b detected by the two sets of correction detection units 31 and the installation distance M of the transmitter 311. Then, the displacement deviation value X of the drive frames 11 on both sides is calculated using the deflection angle θ, distance value b, and installation distance M of the transmitter 311. This method offers convenient position information acquisition and a simple calculation method; it also involves fewer parameters in the displacement deviation value calculation, resulting in low computational complexity and high operability.

[0053] Meanwhile, the calculation of deflection angles θ and X does not require track gauge N, avoiding the problem of large errors when using track gauge N as a calculation parameter. This enables accurate measurement of displacement deviation values ​​when track gauge N changes. This invention can determine the front and rear positions of the two drive frames 11 using the displacement deviation value X. Specifically, if X is negative, then... Figure 6 The left drive frame 11 is at the rear, and the right drive frame 11 is at the front; if X is a positive value, then Figure 6 The drive frame 11 on the left is in front, and the drive frame 11 on the right is in the rear.

[0054] In this embodiment, the transmitter 311 is a radar transmitter, and the receiver 312 is a radar reflector. In other embodiments, the correction detection unit 31 may also employ electromagnetic wave detection methods such as laser or infrared ranging, or a wire sensor detection method.

[0055] like Figure 1 As shown, the bridge inspection system also includes a positioning and attitude determination component 12, which is mounted on the bridge inspection vehicle 1 and is used for positioning and correction of the bridge inspection vehicle 1. The positioning and attitude determination component 12 includes a correction detection unit 31 and a positioning encoder 121. When the positioning encoder 121 detects that the bridge inspection vehicle 1 has moved to a preset position, it controls the bridge inspection vehicle 1 to stop moving to ensure effective detection of the test points at the bottom of the beam 5.

[0056] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A bridge inspection system, comprising a bridge inspection vehicle and a deflection detection assembly, wherein the bridge inspection vehicle is slidably disposed along the longitudinal direction of the bridge, characterized in that, The deflection detection component includes a calculation unit, a transmitting and receiving unit mounted on a bridge inspection vehicle, a first reflector fixed to the bridge pier, and a second reflector fixed to the test point at the bottom of the beam; the transmitting and receiving unit includes a transmitting subunit and a receiving subunit, and the transmitting subunit emits a first emitted light; The receiving subunit receives first reflected light, which is the light returning after the first emitted light passes sequentially through a first reflector and a second reflector. The calculation unit determines the bridge deflection value based on the position where the receiving subunit receives the first reflected light. The emitting subunit is arranged horizontally opposite the first reflector, and the first emitted light from the emitting subunit enters the first reflector horizontally. The reflective surface of the first reflector faces the second reflector, and the reflective surface of the second reflector is horizontally positioned. The second reflector receives the first reflected light from the first reflector and emits it to the receiving subunit. The receiving subunit includes a photosensitive screen, and the angle between the photosensitive screen and the horizontal plane is configured such that the first reflected light is perpendicular to the photosensitive screen. The system also includes a correction assembly to prevent the bridge inspection vehicle from tilting. The correction assembly comprises two sets of correction detection units and a controller. The two sets of correction detection units are mounted on the drive frames on both sides of the bridge inspection vehicle. Each correction detection unit detects the offset information of the drive frames along the longitudinal direction of the bridge and sends it to the controller. The controller calculates the displacement deviation value of the two drive frames based on the offset information and controls the moving speed of the drive frames. Each set of correction detection units includes a transmitter and a receiver, which are diagonally arranged on the drive frames on both sides of the bridge inspection vehicle. The transmitters of both sets of correction detection units are located on the same side of the drive frame, and the transmitter of one set of correction detection units and the receiver of the other set of correction detection units are arranged opposite each other along the transverse direction of the bridge. The offset information includes the distance value between the transmitter and receiver in the same set. The controller is used to determine whether the drive frames on both sides are synchronized based on the two sets of distance values, and calculates the displacement deviation value of the drive frames on both sides based on the two sets of distance values ​​when the drive frames on both sides are not synchronized.

2. The bridge inspection system according to claim 1, characterized in that, The receiving subunit detects the incident position of the first reflected light and sends the incident position to the calculation unit; the calculation unit calculates the bridge deflection value based on the incident position and the reference position; the reference position is the position of the second reflected light received by the receiving subunit when the bridge does not deflect, and the second reflected light is the light returned after the second emitted light emitted by the transmitting subunit passes through the first reflector and the second reflector in sequence.

3. The bridge inspection system according to claim 1 or 2, characterized in that, The transmitting and receiving units are in multiple sets; the multiple sets of transmitting and receiving units are installed on the bridge inspection vehicle and arranged along the transverse direction of the bridge.

4. The bridge inspection system according to claim 1, characterized in that, The expression for calculating the displacement deviation of the two drive frames is as follows: X = b·cos(θ) - M, ， In the formula, X is the displacement deviation value of the two drive frames, a is the distance value between one set of transmitters and receivers, b is the distance value between another set of transmitters and receivers, M is the installation distance of the transmitters on the same side, and θ is the angle between the connecting side of the transmitter and receiver corresponding to b and the drive frame.

5. The bridge inspection system according to claim 1, characterized in that, The correction detection unit is an electromagnetic wave detection unit or a wire sensing detection unit.

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