A detection system for a bridge expansion joint device

Abstract

The utility model relates to a kind of detection systems for bridge expansion joint device, the bridge expansion joint device includes the cross gap comb plate and fixed comb plate being arranged along the length direction extension of bridge expansion joint, the cross gap comb plate is installed on the first beam body, the fixed comb plate is installed on the second beam body and with the cross gap comb plate each other cooperation;Its characterized in that: one of the cross gap comb plate and second beam body is equipped with magnetic member, another is equipped with the magnetic field detection module for detecting the magnetic field size generated by magnetic member.Occupational advantage: the detection system utilizes the relationship between magnetic field size and magnetic member distance, and then according to the magnetic field intensity change detected by magnetic field detection module, obtains bridge expansion joint displacement distance, realizes the displacement distance automatic monitoring of expansion joint device, improves detection accuracy and detection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of bridge inspection technology, and in particular to an inspection system for bridge expansion joint devices. Background Technology

[0002] Expansion joints, as a crucial component of bridge structures, serve to connect the beams on both sides and accommodate thermal expansion and contraction. Under the long-term influence of beam displacement and wheel loads, bridge expansion joints may suffer damage or defects, affecting their performance in terms of expansion deformation, vertical rotation, and horizontal rotation. Therefore, regular inspections of bridge expansion joints are necessary.

[0003] Traditional methods for inspecting bridge expansion joint devices rely primarily on manual inspections. These methods are time-consuming, highly susceptible to the subjective influence of the inspectors, and make it difficult to detect structural damage in a timely manner or directly observe the internal workings of the expansion joint. Therefore, further improvements to existing technologies are necessary. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a detection system for bridge expansion joint devices that can automatically detect expansion joint devices, in light of the above-mentioned prior art.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a detection system for a bridge expansion joint device, the bridge expansion joint device including a cross-joint comb plate and a fixed comb plate extending along the length direction of the bridge expansion joint, the cross-joint comb plate being installed on a first beam, and the fixed comb plate being installed on a second beam and cooperating with the cross-joint comb plate; characterized in that: a magnetic element is provided on one of the cross-joint comb plate and the second beam, and a magnetic field detection module for detecting the magnitude of the magnetic field generated by the magnetic element is provided on the other.

[0006] Preferably, the magnetic component is fixed to the back of the cross-slot comb plate by bolts.

[0007] Preferably, the magnetic component is made of a permanent magnet material.

[0008] Preferably, the permanent magnet material is at least one of neodymium iron boron, samarium cobalt, and alnico.

[0009] Preferably, the upper surface of the first beam is provided with a first mounting groove area, and the upper surface of the second beam is provided with a second mounting groove area. The first mounting groove area is provided with a first concrete layer, and the second mounting groove area is provided with a second concrete layer. The upper surfaces of the first concrete layer and the second concrete layer are flush with the upper surfaces of the fixed comb plate and the cross-slot comb plate.

[0010] Preferably, a first anchor plate is provided on the side of the second concrete layer, and the magnetic field detection module is installed on the first anchor plate.

[0011] To detect the vertical rotation angle of the first beam, preferably, a second anchor plate is also provided in the first concrete layer, extending along the length direction of the bridge expansion joint. The second anchor plate is at least partially exposed outside the first concrete layer, and a first detection module for detecting the vertical rotation angle of the first beam is provided at the position where the second anchor plate is exposed outside the first concrete layer.

[0012] In order to detect the vertical rotation angle and the longitudinal acceleration in the direction of gravity of the cross-slot comb plate, the cross-slot comb plate is provided with a second detection module for detecting the vertical rotation angle and the longitudinal acceleration in the direction of gravity of the cross-slot comb plate.

[0013] Preferably, the first detection module, the second detection module, and the magnetic field detection module are all multi-physical quantity sensors, and the multi-physical quantity sensors have built-in gyroscopes, accelerometers, and magnetometers.

[0014] Compared with the prior art, the advantages of this utility model are as follows: by setting up a magnetic component and a magnetic field detection module for detecting the magnitude of the magnetic field generated by the magnetic component, the magnetic component is set on one of the cross-joint comb plate and the second beam, and the magnetic field detection module is set on the other of the cross-joint comb plate and the second beam. Therefore, by utilizing the relationship between the magnitude of the magnetic field and the distance between the magnetic component, and then based on the change in magnetic field strength detected by the magnetic field detection module, the displacement distance of the bridge expansion joint can be obtained, thereby realizing automatic monitoring of the displacement distance of the expansion joint device, improving detection accuracy and detection efficiency. Attached Figure Description

[0015] Figure 1 This is a structural cross-sectional view of the bridge expansion joint device in an embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram illustrating the detection principle of the magnetic field detection module and the magnetic component in this embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the gravitational acceleration measured by a triaxial accelerometer in an embodiment of this utility model (the bridge expansion joint device is in normal installation condition);

[0018] Figure 4 This is a schematic diagram of the gravitational acceleration measured by a triaxial accelerometer in an embodiment of this utility model (when the bridge expansion joint device is loose);

[0019] Figure 5 This is a schematic diagram of the detection system in an embodiment of the present invention;

[0020] Figure 6This is another detection schematic diagram of the detection system in this embodiment of the present invention. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, the bridge expansion joint device includes a cross-joint comb plate 1 and a fixed comb plate 2 extending along the length of the bridge expansion joint. The cross-joint comb plate 1 is installed on the first beam 3, and the fixed comb plate 2 is installed on the second beam 4 and cooperates with the cross-joint comb plate 1. The structure of the bridge expansion joint device in this embodiment is the prior art, and will not be described in detail here.

[0023] The detection system for bridge expansion joint devices includes a magnetic component 5 and a magnetic field detection module 6 for detecting the magnitude of the magnetic field generated by the magnetic component 5. The magnetic component 5 is disposed on one of the joint comb plate 1 and the second beam 4, and the magnetic field detection module 6 is disposed on the other of the joint comb plate 1 and the second beam 4. Figure 1 As shown, in this embodiment, the magnetic component 5 is disposed on the cross-slot comb plate 1, the magnetic field detection module 6 is disposed on the second beam 4, and the magnetic component 5 is fixed to the back of the cross-slot comb plate 1 by bolt connection. The magnetic component 5 is made of permanent magnet material; the permanent magnet material is at least one of neodymium iron boron, samarium cobalt and alnico.

[0024] The upper surface of the first beam 3 is provided with a first mounting groove area, and the upper surface of the second beam 4 is provided with a second mounting groove area. The first mounting groove area is provided with a first concrete layer 31, and the second mounting groove area is provided with a second concrete layer 41. The upper surfaces of the first concrete layer 31 and the second concrete layer 41 are flush with the upper surfaces of the fixed comb plate 2 and the cross-slot comb plate 1.

[0025] like Figure 1 As shown, a first anchor plate 42 is provided on the side of the second concrete layer 41, and a magnetic field detection module 6 is installed on the first anchor plate 42. A second anchor plate 32 extending along the length of the bridge expansion joint is also provided within the first concrete layer 31. The second anchor plate 32 is at least partially exposed outside the first concrete layer 31, and a first detection module 7 for detecting the vertical rotation angle of the first beam 3 is provided at the exposed position of the second anchor plate 32. Additionally, a second detection module 8 for detecting the vertical rotation angle and longitudinal gravitational acceleration of the cross-joint comb plate 1 is provided on the cross-joint comb plate 1, such as... Figure 1 As shown, the second detection module 8 is also located on the back of the cross-slit comb plate 1 and is positioned adjacent to the magnetic component 5.

[0026] The aforementioned first detection module 7, second detection module 8, and magnetic field detection module 6 are all multi-physical quantity sensors, each incorporating a gyroscope, accelerometer, and magnetometer. Preferably, the gyroscope is a three-axis gyroscope, the accelerometer is a three-axis accelerometer, and the magnetometer is a three-axis magnetometer. The three-axis gyroscope can simultaneously measure position, trajectory, and acceleration in six directions; the three-axis accelerometer is used to detect acceleration, and the three-axis magnetometer is used to detect the magnitude of the magnetic field.

[0027] In this embodiment, the detection system can detect the displacement distance of bridge expansion joints, detect whether the bridge expansion joint device is loose, and detect the displacement angle of bridge expansion joints.

[0028] The process for detecting the displacement distance of bridge expansion joints is as follows:

[0029] like Figure 2 As shown, the magnetic field strength B is inversely proportional to the square of the distance r from the magnetic field source (i.e., magnetic component 5). During the actual detection process, if the magnetic field detection module 6 is at positions a1 and a2 respectively, the distance r1 between the magnetic field detection module 6 and the magnetic component 5 can be obtained through the magnetic field strength B1 corresponding to the magnetic field detection module 6 at position a1. In addition, the distance r2 between the magnetic field detection module 6 and the magnetic component 5 can be obtained through the magnetic field strength B2 corresponding to the magnetic field detection module 6 at position a2. That is, the displacement distance Δr of the bridge expansion joint is r2 - r1.

[0030] The procedure for checking whether bridge expansion joint devices are loose is as follows:

[0031] Under normal installation conditions of the bridge expansion joint device, when a vehicle drives over the bridge expansion joint device, the acceleration in the direction of gravity measured by the triaxial accelerometer in the second detection module 8 is as follows: Figure 3 As shown, when the bridge expansion joint device becomes loose due to loose bolts or loose concrete layers, the expansion joint device also becomes loose. At this time, when a vehicle passes over the bridge expansion joint device again, the measured acceleration in the direction of gravity is as follows: Figure 4 As shown in the figure, by comparison, it can be seen that when the bridge expansion joint device is loose, its acceleration in the direction of gravity increases, and the vibration frequency also increases. Therefore, by comparing the magnitude and frequency of the acceleration in the direction of gravity of the bridge expansion joint device, it is possible to determine whether the bridge expansion joint device is loose.

[0032] The process for detecting the displacement angle of bridge expansion joints is as follows:

[0033] When the bridge undergoes complex displacement, the vertical rotation angle between the cross-joint comb plate 1 and the first beam 3 will change. The three-axis gyroscope in the second detection module 8 will detect the vertical rotation angle θ1 of the cross-joint comb plate 1, and the three-axis gyroscope in the first detection module 7 will detect the vertical rotation angle θ2 of the first beam 3. Figure 5As shown, θ1 > 0, θ2 > 0; Figure 6 As shown, θ1>0, θ2<0.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A detection system for a bridge expansion joint device, the bridge expansion joint device comprising a cross-joint comb plate (1) and a fixed comb plate (2) extending along the length direction of the bridge expansion joint, the cross-joint comb plate (1) being mounted on a first beam (3), and the fixed comb plate (2) being mounted on a second beam (4) and cooperating with the cross-joint comb plate (1). Its features are: One of the cross-slit comb plate (1) and the second beam (4) is provided with a magnetic element (5), and the other is provided with a magnetic field detection module (6) for detecting the magnitude of the magnetic field generated by the magnetic element (5).

2. The detection system according to claim 1, characterized in that: The magnetic component (5) is fixed to the back of the cross-slot comb plate (1) by bolt connection.

3. The detection system according to claim 2, characterized in that: The magnetic component (5) is made of permanent magnet material.

4. The detection system according to claim 3, characterized in that: The permanent magnet material is at least one of neodymium iron boron, samarium cobalt, and alnico.

5. The detection system according to any one of claims 1 to 4, characterized in that: The upper surface of the first beam (3) is provided with a first mounting groove area, and the upper surface of the second beam (4) is provided with a second mounting groove area. The first mounting groove area is provided with a first concrete layer (31), and the second mounting groove area is provided with a second concrete layer (41). The upper surfaces of the first concrete layer (31) and the second concrete layer (41) are flush with the upper surfaces of the fixed comb plate (2) and the cross-slot comb plate (1).

6. The detection system according to claim 5, characterized in that: The second concrete layer (41) is provided with a first anchor plate (42) on its side, and the magnetic field detection module (6) is installed on the first anchor plate (42).

7. The detection system according to claim 6, characterized in that: The first concrete layer (31) is also provided with a second anchor plate (32) extending along the length of the bridge expansion joint. The second anchor plate (32) is exposed at least partially outside the first concrete layer (31). The second anchor plate (32) is provided with a first detection module (7) for detecting the vertical rotation angle of the first beam (3) at the position where it is exposed outside the first concrete layer (31).

8. The detection system according to claim 7, characterized in that: The cross-slit comb plate (1) is provided with a second detection module (8) for detecting the vertical rotation angle of the cross-slit comb plate (1) and its longitudinal gravitational acceleration.

9. The detection system according to claim 8, characterized in that: The first detection module (7), the second detection module (8) and the magnetic field detection module (6) are all multi-physical quantity sensors, and the multi-physical quantity sensors have built-in gyroscopes, accelerometers and magnetometers.

Images