Bridge deflection monitoring device

Abstract

The application relates to a bridge deflection monitoring device, which comprises a to-be-measured beam body, the to-be-measured beam body has a to-be-measured surface, the to-be-measured surface is provided with a first positioning point and a second positioning point at intervals along the length direction of the to-be-measured beam body, the first positioning point and the second positioning point are arranged at two ends of the to-be-measured surface respectively, a connecting piece is arranged on the to-be-measured surface, the connecting piece is arranged in tension between the first positioning point and the second positioning point, the connecting piece is of a flexible structure, a traction mechanism is fixed on the to-be-measured surface, the traction mechanism is arranged between the first positioning point and the second positioning point, the traction mechanism comprises a traction channel, the connecting piece is arranged in the traction channel, and the traction channel is used for limiting the connecting piece. Through the technical scheme, the problem of low accuracy of deflection monitoring of the bridge in the related art can be solved.

Description

Technical Field

[0001] This application relates to the field of bridge deflection monitoring technology, and in particular to bridge deflection monitoring devices. Background Technology

[0002] Bridges are an important part of transportation networks, and regular monitoring is necessary to ensure their safety. Deflection is one of the key parameters in bridge safety assessment. Deflection refers to the vertical displacement of a bridge under load, and changes in deflection can be used to assess the safety risks associated with the bridge.

[0003] In related technologies, some bridge deflection monitoring devices use flexible cables for monitoring. However, because these cables are made of soft materials, they naturally sag under gravity, forming an arc. This arc does not match the bridge's actual deflection curve caused by stress. Therefore, during monitoring, complex calculations are needed to eliminate the influence of the cable's sag in order to calculate the bridge's true deflection. This setup involves a large amount of calculation and is prone to inaccurate results due to measurement errors. Utility Model Content

[0004] Therefore, it is necessary to provide a bridge deflection monitoring device to address the problem of low accuracy in bridge deflection monitoring.

[0005] A bridge deflection monitoring device, comprising:

[0006] The beam to be measured has a surface to be measured. The surface to be measured has a first positioning point and a second positioning point spaced apart along the length of the beam. The first positioning point and the second positioning point are respectively located at both ends of the surface to be measured.

[0007] A connector is placed on the surface to be measured. The connector is tensioned between the first positioning point and the second positioning point. The connector is a flexible structure.

[0008] The traction mechanism is fixed on the surface to be measured and is located between the first positioning point and the second positioning point. The traction mechanism includes a traction channel, and a connecting member passes through the traction channel. The traction channel is used to limit the movement of the connecting member.

[0009] In one embodiment, the bridge deflection monitoring device further includes:

[0010] Two first monitoring mechanisms are fixed at both ends of the surface to be measured to monitor the dimensions of the connector between the first and second positioning points along the length and vertical directions.

[0011] The second monitoring unit is fixed on the surface to be tested and monitors the insertion and exit directions of the connector when it passes through the traction channel.

[0012] In one embodiment, the traction mechanism includes:

[0013] A first traction assembly, the first traction assembly having a first channel, the first traction assembly being fixed at a first positioning point and / or a second positioning point;

[0014] A second traction assembly is disposed between the first positioning point and the second positioning point, and the second traction assembly has a second channel;

[0015] The second monitoring agency monitors the insertion and exit directions of the connector when it passes through the second channel. The connector passes through the first and second channels. The traction channel includes the first and second channels.

[0016] In one embodiment, two first monitoring mechanisms are fixed at a first positioning point and a second positioning point, respectively. One end of the connector is fixedly set to the first monitoring mechanism at the first positioning point, the first traction component is fixed to the first monitoring mechanism at the second positioning point, and the other end of the connector passes through the first channel.

[0017] In one embodiment, the second traction component includes:

[0018] The first traction member is rotatably mounted on the surface to be measured, and the first traction member includes a first through structure;

[0019] The second traction member is rotatably mounted on the surface to be measured. The second traction member includes a second through structure. There is an angle between the first through structure and the second through structure. The first through structure and the second through structure form a second channel.

[0020] The connectors pass through the first through structure and the second through structure in sequence.

[0021] In one embodiment, the second monitoring mechanism is disposed on the line connecting the first positioning point and the second positioning point, and both the first traction member and the second traction member are hinged and fixed to the second monitoring mechanism.

[0022] In one embodiment, the second monitoring agency includes:

[0023] The fixing component, the first traction component and the second traction component are both hinged to the fixing component, and the fixing component is made of insulating material;

[0024] A resistive element is fixed on a fixing member. A first traction member and a second traction member are slidably connected to the resistive element, and the first traction member and the second traction member are electrically connected to each other.

[0025] In one embodiment, the first traction member includes:

[0026] A first fixing plate is rotatably mounted on the surface to be measured;

[0027] The first guide part is fixed on the first fixed plate and has a first through structure.

[0028] In one embodiment, the bridge deflection monitoring device further includes:

[0029] The drive mechanism includes a fixed component and a rotating component, the rotating component being rotatably mounted on the fixed component, and a connecting member being wound around the rotating component.

[0030] In one embodiment, the connector includes a connecting rope made of a flexible material.

[0031] In the aforementioned bridge deflection monitoring device, the traction mechanism is fixed to the surface to be measured. When the bridge experiences downward displacement, the traction mechanism moves downward accordingly. The connector, inserted within the traction channel, is tensioned between a first positioning point and a second positioning point. The traction mechanism drives the connector to bend in the same direction as the bridge. Therefore, the spatial shape of the connector closely matches the bridge's deflection curve. This design limits the bending of the connector, preventing further bending caused by its own weight or external forces, significantly improving the accuracy and reliability of subsequent measurement data. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a bridge deflection monitoring device provided in one embodiment of this application;

[0033] Figure 2 A schematic diagram of the structure in which the first positioning point and the second positioning point cooperate, provided for an embodiment of this application;

[0034] Figure 3 A schematic diagram of the structure of the second traction assembly cooperating with the fixing member and the resistive element according to an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the structure of the second channel provided in an embodiment of this application;

[0036] Figure 5 A side view of a first traction member provided in an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Beam to be measured; 11. Surface to be measured; 111. First positioning point; 112. Second positioning point;

[0039] 20. Connectors;

[0040] 31. Second traction assembly;

[0041] 311, Second Channel;

[0042] 312, First traction component; 3121, First fixing plate; 3122, First guide section; 31221, First through structure; 31222, First notch;

[0043] 313. Second traction component; 3131. Second fixing plate; 3132. Second guide part; 31321. Second through structure;

[0044] 40. The primary monitoring agency;

[0045] 50. Second monitoring unit; 51. Fixture; 52. Resistive element;

[0046] 60. Drive mechanism. Detailed Implementation

[0047] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0048] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0049] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0053] See Figure 1 and Figure 2 A bridge deflection monitoring device includes a beam body 10 to be measured, a connector 20, and a traction mechanism. The beam body 10 has a measured surface 11, with first positioning points 111 and second positioning points 112 spaced apart along its length. The first positioning points 111 and second positioning points 112 are respectively located at both ends of the measured surface 11. The connector 20 is disposed on the measured surface 11 and is tensioned between the first positioning points 111 and second positioning points 112. The connector 20 is a non-flexible structure. The traction mechanism is fixed to the measured surface 11 and is located between the first positioning points 111 and second positioning points 112. The traction mechanism includes a traction channel through which the connector 20 passes, and the traction channel is used to limit the movement of the connector 20.

[0054] Using the technical solution of this application, the traction mechanism is fixed on the surface 11 to be measured. When the bridge experiences downward displacement, the traction mechanism moves downward accordingly. The connector 20 passes through the traction channel and is tensioned between the first positioning point 111 and the second positioning point 112. The traction mechanism drives the connector 20 to bend in the same direction as the bridge. Therefore, the spatial shape of the connector 20 can closely match the deflection curve of the bridge. With this configuration, the traction mechanism can limit the bending of the connector 20, avoiding other bending caused by its own weight or external forces, significantly improving the accuracy and reliability of subsequent measurement data.

[0055] In some embodiments, the projection of the traction channel along the vertical direction coincides with the line connecting the first positioning point 111 and the second positioning point 112, but the dimension of the traction channel along the length direction of the beam body 10 to be measured is smaller than the distance between the first positioning point 111 and the second positioning point 112.

[0056] In the actual installation of the connector 20, the connector 20 is positioned close to the surface to be tested 11, but does not contact the surface to be tested 11. In some embodiments, the vertical distance between each point of the connector 20 and the surface to be tested 11 is no greater than 1 / 200 of the total length of the surface to be tested 11.

[0057] In some embodiments, the connector 20 is a connecting rope. This arrangement facilitates the assembly of the connector 20 and makes the connecting rope readily available, thereby reducing monitoring costs.

[0058] In other embodiments, the connector 20 is a chain.

[0059] In some embodiments, the beam to be measured 10 is a box girder, and the surface to be measured 11 is the bottom surface of the hollow cavity of the box girder. This arrangement ensures that the measurement process will not affect vehicle traffic, thus guaranteeing the normal passage function of the bridge.

[0060] In some embodiments, the bridge further includes piers, and the two ends of the beam 10 to be measured are respectively fixed on the two piers, and the projections of the first positioning point 111 and the second positioning element along the vertical direction can be located on the two piers respectively.

[0061] In some embodiments, the length direction of the connector 20 is parallel to the length direction of the beam 10 to be measured.

[0062] See Figure 1The bridge deflection monitoring device also includes two first monitoring mechanisms 40 and a second monitoring mechanism 50. The two first monitoring mechanisms 40 are respectively fixed at both ends of the surface 11 to be measured to monitor the dimensions of the connector 20 between the first positioning point 111 and the second positioning point 112 along its length and vertical direction. The second monitoring mechanism 50 is fixed on the surface 11 to monitor the insertion and exit directions of the connector 20 when it passes through the traction channel. This configuration, with the two first monitoring mechanisms 40 fixed at both ends of the surface 11 to be measured, ensures accurate acquisition of the length of the connector 20 between the first positioning point 111 and the second positioning point 112, as well as its height along the vertical direction. The second monitoring mechanism 50 can monitor the morphological changes of the connector 20 at its intermediate position. The first monitoring mechanisms 40 and 50 work together to accurately acquire the data required for subsequent calculations.

[0063] In some embodiments, the bridge deflection monitoring device further includes a control mechanism that can accurately calculate the deflection using the aforementioned data. Since the control mechanism is existing technology, it will not be described in detail here.

[0064] In some embodiments, the first monitoring unit 40 is a position sensor.

[0065] In some embodiments, the second monitoring unit 50 is an angle sensor.

[0066] In some embodiments, the first monitoring unit 40 is attached and fixed to the surface to be tested 11.

[0067] In some embodiments, fasteners are pre-embedded on the surface to be tested 11, and the first monitoring mechanism 40 is fixed on the fasteners.

[0068] In some embodiments, the second monitoring unit 50 is attached and fixed to the surface to be tested 11.

[0069] In some embodiments, fasteners are pre-embedded on the surface to be tested 11, and the second monitoring mechanism 50 is fixed on the fasteners.

[0070] See Figure 3 and Figure 4The traction mechanism includes a first traction component and a second traction component 31. The first traction component has a first channel and is fixed at a first positioning point 111 and / or a second positioning point 112. The second traction component 31 has a second channel 311 and is positioned between the first positioning point 111 and the second positioning point 112. A second monitoring mechanism 50 monitors the insertion and exit directions of the connector 20 when it passes through the second channel 311. The connector 20 passes through the first channel and the second channel 311, and the traction channel includes the first channel and the second channel 311. With this configuration, the connector 20 can be precisely guided and constrained by multiple points when tensioned, further improving the fit between the spatial shape of the connector 20 and the bridge deflection curve, and improving the stability of the connector 20, preventing the connector 20 from shaking or tilting, and further improving the stability of the measurement.

[0071] Although the first traction component and the second traction component 31 have a certain height during construction, and there may be a height difference between them, the height of the two components or the height difference between them is negligible relative to the length of the bridge.

[0072] In some embodiments, the first traction component and the second traction component 31 are ring-shaped structures, and the connector 20 can pass directly through the first traction component and the second traction component 31.

[0073] See Figure 1 Two first monitoring mechanisms 40 are respectively fixed at the first positioning point 111 and the second positioning point 112. One end of the connector 20 is fixedly set to the first monitoring mechanism 40 at the first positioning point 111, and the first traction component is fixed to the first monitoring mechanism 40 at the second positioning point 112. The other end of the connector 20 passes through the first channel. This arrangement allows operators to tighten or loosen the connector 20 by tightening or releasing the other end, facilitating operation. Furthermore, since one end of the connector 20 is fixed to one of the first monitoring mechanisms 40, and the first traction component is set to the other, the volume occupied by the first traction component and the first monitoring mechanism 40 is reduced. The distance between the two first monitoring mechanisms 40 is the distance between the first positioning point 111 and the second positioning point 112, improving the accuracy of the measurement results.

[0074] See Figure 3The second traction assembly 31 includes a first traction member 312 and a second traction member 313. The first traction member 312 is rotatably disposed on the surface to be measured 11 and includes a first through structure 31221. The second traction member 313 is rotatably disposed on the surface to be measured 11 and includes a second through structure 31321. The first through structure 31221 and the second through structure 31321 have an included angle, and the first through structure 31221 and the second through structure 31321 form a second channel 311. The connecting member 20 passes sequentially through the first through structure 31221 and the second through structure 31321. With this configuration, the first through structure 31221 and the second through structure 31321 have an included angle. When the connector 20 passes through the first through structure 31221 and the second through structure 31321, and when the connector 20 is tensioned, the first through structure 31221 and the second through structure 31321 cooperate to make the connector 20 bend downwards, so that the spatial shape of the connector 20 matches the deflection curve of the bridge. Furthermore, by detecting the angle between the first traction member 312 and the second traction member 313, the insertion direction and the exit direction can be obtained, further improving the accuracy of subsequent measurements.

[0075] See Figure 1 The second monitoring mechanism 50 is positioned on the line connecting the first positioning point 111 and the second positioning point 112. The first traction member 312 and the second traction member 313 are both hinged and fixed to the second monitoring mechanism 50. This arrangement reduces the volume occupied by the second traction assembly 31 and the second monitoring mechanism 50, and the second monitoring mechanism 50 can accurately detect the angles of the first traction member 312 and the second traction member 313.

[0076] In some embodiments, the first monitoring agency 40 and the second monitoring agency 50 are capable of being internally tangent to the bridge deflection arc.

[0077] In some embodiments, the bridge deflection monitoring device includes a plurality of second monitoring mechanisms 50 and a plurality of second traction components 31. The plurality of second monitoring mechanisms 50 and the plurality of second traction components 31 are arranged in a one-to-one correspondence. The plurality of second monitoring mechanisms 50 are arranged at intervals between the first positioning point 111 and the second positioning point 112 along the length direction of the beam body 10 to be tested, and the second traction components 31 are arranged on the corresponding second monitoring mechanism 50.

[0078] See Figure 3The second monitoring mechanism 50 includes a fixing member 51 and a resistive element 52. The first traction member 312 and the second traction member 313 are both hinged to the fixing member 51, which is made of insulating material. The resistive element 52 is fixed to the fixing member 51. The first traction member 312 and the second traction member 313 are slidably connected to the resistive element 52 and are electrically connected to each other. This configuration, using the principle of a sliding rheostat, converts the angle between the first traction member 312 and the second traction member 313 into changes in resistance or voltage. The relative position of the first traction member 312 and the second traction member 313 determines the output electrical signal, which directly and continuously reflects the angle change, facilitating subsequent data acquisition.

[0079] In some embodiments, the first traction member 312 and the second traction member 313 are rotatably sleeved on the same rotating shaft, and the rotating shaft is fixed on the fixing member 51.

[0080] In some embodiments, the resistive element 52 is a coil with an arc-shaped structure, and the coil is concentrically positioned with the rotating shaft.

[0081] See Figure 5 The first traction member 312 includes a first fixing plate 3121 and a first guide portion 3122. The first fixing plate 3121 is rotatably disposed on the surface to be measured 11, that is, the first fixing plate 3121 is rotatably disposed on the fixing member 51. The first guide portion 3122 is fixed on the first fixing plate 3121, and the first guide portion 3122 has a first through structure 31221. With this configuration, the first traction member 312 has a simple structure, is easy to process, and is also easy to fix.

[0082] In some embodiments, the first guide portion 3122 is a cylindrical mechanism, and a first notch 31222 is axially provided on the cylindrical structure, the central angle corresponding to the first notch 31222 being less than 90°. This arrangement facilitates the insertion of the connector 20 into the first guide portion 3122, while reducing the likelihood of the connector 20 falling off the first through structure 31221 during tensioning.

[0083] See Figure 3 The second traction member 313 includes a second fixing plate 3131 and a second guide portion 3132. The second fixing plate 3131 is rotatably mounted on the surface to be measured 11, that is, the second fixing plate 3131 is rotatably mounted on the fixing member 51. The second guide portion 3132 is fixed to the second fixing plate 3131, and the second guide portion 3132 has a second through structure 31321. With this configuration, the second traction member 313 has a simple structure, is easy to process, and is also easy to fix.

[0084] In some embodiments, the first traction component and the second traction component 31 have the same structure.

[0085] The second channel 311 includes a first through structure 31221 and a second through structure 31321.

[0086] In some embodiments, the second guide portion 3132 is a cylindrical mechanism, with a second notch axially extending through the cylindrical structure, and the central angle corresponding to the second notch is less than 90°. This arrangement facilitates the insertion of the connector 20 into the second guide portion 3132, while reducing the likelihood of the connector 20 detaching from the second through structure 31321 during tensioning.

[0087] See Figure 1 The bridge deflection monitoring device also includes a drive mechanism 60, which comprises a fixed component and a rotating component. The rotating component is rotatably mounted on the fixed component, and the connector 20 is wound around the rotating component. This configuration improves the automation level of the bridge deflection monitoring device, eliminating the need for manual dragging and reducing the labor intensity of workers, while ensuring the tension of the connector 20. The drive mechanism 60 can tighten the connector 20, but when the bridge deforms, the angle between the first traction member 312 and the second traction member 313 increases. To prevent the connector 20 from breaking, the drive mechanism releases part of the connector 20, but the connector 20 remains under tension at this time.

[0088] In some embodiments, the drive structure is a winch.

[0089] In some embodiments, a first traction component is provided on both the first positioning point 111 and the second positioning point 112, and a drive mechanism 60 is provided on the side of the first positioning point 111 and the second positioning point 112 away from each other. The two drive mechanisms 60 are capable of winding and releasing both ends of the connector 20. This arrangement, through redundant design, improves the reliability of the bridge deflection monitoring device.

[0090] In some embodiments, one end of the connector 20 is fixedly disposed with the first monitoring mechanism 40 on the first positioning point 111, the first traction component is fixed on the first monitoring mechanism 40 on the second positioning point 112, and the drive mechanism 60 is disposed on the side of the second positioning point 112 away from the first positioning point 111. The drive mechanism 60 winds up and releases the end of the connector 20 away from the first positioning point 111.

[0091] In some embodiments, the drive mechanism 60 is a counterweight block, which tightens the connector 20 by gravity. When the bridge deforms, the angle between the first traction member 312 and the second traction member 313 increases, which can drive the counterweight block to move upward.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A bridge deflection monitoring device, characterized in that, The bridge deflection monitoring device includes: The beam to be tested (10) has a test surface (11). The test surface (11) is provided with a first positioning point (111) and a second positioning point (112) at intervals along the length direction of the beam to be tested (10). The first positioning point (111) and the second positioning point (112) are respectively located at both ends of the test surface (11). A connector (20) is disposed on the surface to be measured (11). The connector (20) is tensioned between the first positioning point (111) and the second positioning point (112). The connector (20) is a flexible structure. The traction mechanism is fixed on the surface to be measured (11) and is located between the first positioning point (111) and the second positioning point (112). The traction mechanism includes a traction channel, and the connector (20) passes through the traction channel. The traction channel is used to limit the connector (20).

2. The bridge deflection monitoring device according to claim 1, characterized in that, The bridge deflection monitoring device also includes: Two first monitoring mechanisms (40) are respectively fixed at both ends of the surface to be measured (11) to monitor the dimensions of the connector (20) between the first positioning point (111) and the second positioning point (112) along the length and vertical directions; The second monitoring mechanism (50) is fixed on the surface to be tested (11) and monitors the insertion and exit directions of the connector (20) when it passes through the traction channel.

3. The bridge deflection monitoring device according to claim 2, characterized in that, The traction mechanism includes: A first traction component having a first channel, the first traction component being fixed at the first positioning point (111) and / or the second positioning point (112). The second traction component (31) is disposed between the first positioning point (111) and the second positioning point (112), and the second traction component (31) has a second channel (311). The second monitoring mechanism (50) monitors the insertion direction and the exit direction of the connector (20) when it passes through the second channel (311). The connector (20) passes through the first channel and the second channel (311). The traction channel includes the first channel and the second channel (311).

4. The bridge deflection monitoring device according to claim 3, characterized in that, Two first monitoring mechanisms (40) are fixed at the first positioning point (111) and the second positioning point (112) respectively. One end of the connector (20) is fixedly set to the first monitoring mechanism (40) at the first positioning point (111). The first traction component is fixed to the first monitoring mechanism (40) at the second positioning point (112). The other end of the connector (20) passes through the first channel.

5. The bridge deflection monitoring device according to claim 3, characterized in that, The second traction assembly (31) includes: The first traction member (312) is rotatably disposed on the surface to be measured (11), and the first traction member (312) includes a first through structure (31221). The second traction member (313) is rotatably disposed on the surface to be measured (11). The second traction member (313) includes a second through structure (31321). The first through structure (31221) and the second through structure (31321) have an included angle. The first through structure (31221) and the second through structure (31321) form the second channel (311). The connector (20) passes sequentially through the first through structure (31221) and the second through structure (31321).

6. The bridge deflection monitoring device according to claim 5, characterized in that, The second monitoring mechanism (50) is set on the line connecting the first positioning point (111) and the second positioning point (112), and the first traction member (312) and the second traction member (313) are both hinged and fixed to the second monitoring mechanism (50).

7. The bridge deflection monitoring device according to claim 6, characterized in that, The second monitoring agency (50) includes: The fixing member (51) is hinged to both the first traction member (312) and the second traction member (313), and the fixing member (51) is made of insulating material. A resistor element (52) is fixed on the fixing member (51). The first traction member (312) and the second traction member (313) are slidably connected to the resistor element (52) and are electrically connected to each other.

8. The bridge deflection monitoring device according to claim 5, characterized in that, The first traction member (312) includes: A first fixing plate (3121) is rotatably mounted on the surface to be measured (11); The first guide portion (3122) is fixed on the first fixing plate (3121) and has the first through structure (31221).

9. The bridge deflection monitoring device according to claim 1, characterized in that, The bridge deflection monitoring device also includes: The drive mechanism (60) includes a fixed component and a rotating component, the rotating component being rotatably disposed on the fixed component, and the connecting member (20) being wound around the rotating component.

10. The bridge deflection monitoring device according to claim 1, characterized in that, The connector (20) includes a connecting rope made of a flexible material.

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