Deformation measuring device of bridge support
By simplifying the structure of the deformation measuring device and using a laser beam and a protractor to measure the shear deformation angle of the bridge bearing, the problems of complex structure and high cost in the existing technology are solved, and accurate measurement in a small space is achieved.
Patent Information
- Application Number
- CN202423126770.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In the prior art, the deformation measurement device of the bridge bearing has a complex structure and high cost, and it is difficult to achieve accurate measurement in a small space.
A simplified structural design is adopted, including a deformation measuring device consisting of a first fixed bar, a protractor, first and second lasers, an indicating link, etc. The shear deformation angle of the support is measured using a laser beam and a protractor, and accurate measurement is achieved through the principle of similar triangles.
On the basis of simplifying the structure, the accuracy of deformation measurement is improved and the cost is reduced, and the shear deformation angle of the support can be measured efficiently and accurately in a small space.
Smart Images
Figure CN223485084U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge bearing deformation detection technology, and in particular to a deformation measuring device for bridge bearings. Background Technology
[0002] Plate rubber bearings are widely used in small- and medium-span bridges. Their main function is to transfer the forces exerted by the superstructure (including the structure's own weight and vertical and horizontal forces caused by variable actions) to the bridge piers and abutments, while also adapting to the deformation (displacement and rotation) of the bridge structure under factors such as vehicle loads and temperature changes. In recent years, with increasing traffic loads and harsher natural environments, the performance and durability of rubber bearings have received increasing attention. Shear deformation is a common problem encountered by rubber bearings during long-term use, and in severe cases, it can lead to bearing failure and affect structural safety. Therefore, it is necessary to measure the degree of bearing deformation to assess the bearing's service life.
[0003] Traditional methods involve directly measuring the shear deformation angle of the support using a protractor. However, the limited operating space in the installation environment of the support results in poor accuracy. Related technologies employ automated measurement devices based on multiple sensors, but these devices are complex in structure and expensive. Utility Model Content
[0004] The main purpose of this invention is to propose a deformation measuring device for bridge bearings, aiming to solve the technical problem of how to improve the accuracy of bearing deformation measurement results while simplifying the structure of the deformation measuring device and reducing costs.
[0005] To achieve the above objectives, the deformation measuring device for bridge bearings proposed in this utility model includes:
[0006] The first fixing bar extends longitudinally;
[0007] A protractor, which is slidably mounted longitudinally on the first fixing strip, the straight edge of the protractor extending longitudinally;
[0008] A first laser is slidably mounted on the first fixed strip along the longitudinal direction and moves or stops synchronously with the protractor. The emission point of the first laser and the zero mark of the protractor are located on the same horizontal line. The first laser is used to emit a laser beam in a direction away from the protractor.
[0009] The second fixing strip is located below the first laser and extends laterally.
[0010] A second laser is slidably mounted on the second fixing strip in a lateral direction. The second laser is located in the horizontal direction on the side of the first laser away from the protractor. The laser beam emitted by the second laser is parallel to the laser beam emitted by the first laser.
[0011] An indicator link extends along the line connecting the light emission points of the first laser and the second laser. One end of the indicator link is rotatably connected to the second laser, and the other end points to the scale line of the protractor. The indicator link is slidably connected to the first laser so that the angle between the indicator link and the horizontal direction changes as the positions of the first laser and the second laser change.
[0012] Optionally, the second fixing strip is configured as a ruler, with the zero mark of the second fixing strip and the light-emitting point of the first laser located on the same vertical line.
[0013] Optionally, the deformation measuring device for the bridge bearing further includes a movable strip and a third laser. The movable strip is arranged side by side on the side of the first fixed strip away from the protractor and can move towards or away from the first fixed strip. The third laser can be slidably mounted on the movable strip along the longitudinal direction, and the laser beam emitted by the third laser is parallel to the laser beam emitted by the first laser.
[0014] Optionally, the deformation measuring device for the bridge bearing further includes a third fixed strip and a sliding connector. The third fixed strip is located above the first laser and extends laterally. The sliding connector is slidably mounted on the first fixed strip laterally. The top end of the movable strip is connected to the sliding connector so that the movable strip moves or stops synchronously with the sliding connector.
[0015] Optionally, the third fixing strip is configured as a ruler, with the zero mark of the third fixing strip and the light-emitting point of the first laser located on the same vertical line, and the center of the sliding connector and the light-emitting point of the third laser located on the same vertical line.
[0016] Optionally, the deformation measuring device for the bridge bearing further includes a first sliding joint column, which is slidably mounted longitudinally on the first fixing strip, the first laser is mounted on the first sliding joint column, and the protractor is connected to the first sliding joint column.
[0017] Optionally, the first fixing strip is provided as a strip plate, and the first fixing strip has a first sliding groove extending in the longitudinal direction, and the first sliding post is slidably engaged with the first sliding groove.
[0018] Optionally, the indicator link is provided with a second sliding groove, which extends along the length of the indicator link, and the first sliding post is slidably engaged with the second sliding groove.
[0019] Optionally, the first fixing bar is located behind the second fixing bar, the indicating link is located behind the first fixing bar, and the protractor is located behind the indicating link.
[0020] Optionally, the deformation measuring device for the bridge bearing further includes a level, which is used to measure the levelness of the second fixing strip.
[0021] In the technical solution of the deformation measuring device for bridge bearings of this utility model, when the deformation measuring device is working, the laser beam of the first laser is projected onto the outermost convex position of the side of the bearing, and the laser beam of the second laser is projected onto the intersection point of the side of the bearing and the pad stone below. Since the laser beams of the first and second lasers are parallel, the indicator rod, the laser beams of the first and second lasers, and the side of the bearing can form a parallelogram. According to the principle of similar triangles, the angle α2 between the indicator rod and the straight side of the protractor is equal to the angle α between the side of the bearing and the horizontal line. Therefore, the scale value of the protractor pointed to by the indicator rod is the angle α between the side of the bearing and the horizontal line, which is the shear deformation angle value of the bearing. Thus, the deformation measuring device for bridge bearings of this utility model can achieve accurate measurement of the shear deformation angle value of the bearing through a simple structure. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0023] Figure 1 This is a cross-sectional schematic diagram of the bridge structure.
[0024] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;
[0025] Figure 3 This is a schematic diagram of the structure of an embodiment of the deformation measuring device for bridge bearings according to this utility model;
[0026] Figure 4 This is a schematic diagram of the measurement process of an embodiment of the deformation measuring device for bridge bearings of this utility model;
[0027] Figure 5This is a schematic diagram of the laser beam projection point of the deformation measuring device for bridge bearings of this utility model.
[0028] Figure 6 This is a schematic diagram illustrating the reading of measurement results from an embodiment of the deformation measuring device for bridge bearings according to this utility model.
[0029] Explanation of icon numbers:
[0030] label name label name label name 10 First fixed bar 20 Protractor 30 First laser 40 Second fixing strip 50 Second laser 60 Indicator Link 70 Activity bar 80 Third laser 90 Third fixed bar 91 Sliding connector 11 First chute 61 Second chute 93 spirit level 200 support
[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text is to include three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0035] Plate rubber bearings are widely used in small- and medium-span bridges. Their main function is to transfer the forces exerted by the superstructure (including the structure's own weight and vertical and horizontal forces caused by variable actions) to the bridge piers and abutments, while also adapting to the deformation (displacement and rotation) of the bridge structure under factors such as vehicle loads and temperature changes. In recent years, with increasing traffic loads and harsher natural environments, the performance and durability of rubber bearings have received increasing attention. Shear deformation is a common problem encountered by rubber bearings during long-term use, and in severe cases, it can lead to bearing failure and affect structural safety. Therefore, it is necessary to measure the degree of bearing deformation to assess the bearing's service life.
[0036] Traditional methods involve directly measuring the shear deformation angle of the support using a protractor. However, the limited operating space in the installation environment of the support results in poor accuracy. Related technologies employ automated measurement devices based on multiple sensors, but these devices are complex in structure and expensive.
[0037] This utility model proposes a deformation measuring device for bridge bearings, aiming to solve the technical problem of how to improve the accuracy of deformation measurement results of bearings 200 while simplifying the structure of the deformation measuring device and reducing costs.
[0038] In the embodiments of this utility model, such as Figure 1 As shown, the bridge structure includes, from bottom to top, a cap beam, a pad stone, bearings 200, and a main beam, wherein bearings 200 are rubber bearings. After long-term load-bearing, bearings 200 may experience bulging and shear deformation, or even detachment; therefore, it is necessary to test the degree of shear deformation, detachment, and bulging of bearings 200 to assess their continued serviceability.
[0039] like Figure 2 As shown, the degree of shear deformation is measured by measuring the shear deformation angle of the support 200. The support 200 is rectangular in shape in the early stage of service. After long-term load-bearing, it undergoes shear deformation in the transverse direction. The cross-sectional shape after deformation is similar to a parallelogram. At this time, the angle between the side of the support 200 and the horizontal direction also changes from a right angle to an acute angle α. By detecting the angle α between the side of the support 200 and the horizontal direction, the shear deformation angle of the support 200 can be obtained intuitively.
[0040] like Figure 2 As shown, the degree of separation refers to the lateral length of the area on the upper surface of the support 200 that is separated from the main beam due to deformation. This is determined by measuring the lateral length of the area on the upper surface of the support 200 that is not in contact with the main beam (i.e., the area where the support 200 is separated from the main beam). Figure 2 The lateral distance T between points A and C, i.e. the length of the void, reflects the degree of voiding of support 200.
[0041] like Figure 2 As shown, the degree of bulging refers to the lateral distance between the most protruding point on the side of the support 200 and the bottom edge of the side of the support 200 after deformation. Figure 2 The lateral distance W between points A and B.
[0042] By measuring the above three deformation parameters, the overall continued service capability of the support 200 can be comprehensively evaluated.
[0043] like Figure 3 As shown, the deformation measuring device for bridge bearings proposed in this utility model includes: a first fixing bar 10, which extends longitudinally; a protractor 20, which is slidably mounted on the first fixing bar 10 longitudinally, with its straight edge extending longitudinally; a first laser 30, which is slidably mounted on the first fixing bar 10 longitudinally and moves or stops synchronously with the protractor 20, wherein the emission point of the first laser 30 and the zero mark of the protractor 20 are located on the same horizontal line, and the first laser 30 is used to emit a laser beam in a direction away from the protractor 20; a second fixing bar 40, which is disposed below the first laser 30 and extends laterally; and a second laser 50, which is slidably mounted laterally. The second laser 50 is movably mounted on the second fixing strip 40. The second laser 50 is located in the horizontal direction on the side of the first laser 30 away from the protractor 20. The laser beam emitted by the second laser 50 is parallel to the laser beam emitted by the first laser 30. The indicator link 60 extends along the line connecting the light emission points of the first laser 30 and the second laser 50. One end of the indicator link 60 is rotatably connected to the second laser 50, and the other end forms an indicator tip pointing to the scale line of the protractor 20. The extension line of the indicator tip passes through the light emission point of the first laser 30. The indicator link 60 is slidably connected to the first laser 30 so that the angle between the indicator link 60 and the horizontal direction changes with the position of the first laser 30 and the second laser 50.
[0044] In this embodiment, the zero mark of the protractor 20 passes through the light-emitting point of the first laser 30, and the extension line of the indicator tip of the indicator link 60 also passes through the light-emitting point of the first laser 30. Therefore, the scale of the protractor 20 pointed to by the indicator tip is the angle α1 between the indicator link 60 and the horizontal direction. Since the protractor 20 and the first laser 30 move or stop synchronously, the zero mark of the protractor 20 will always pass through the light-emitting point of the first laser 30. The laser beam angles of the first laser 30 and the second laser 50 are preset, and the specific emission angles are not limited, as long as the laser beams of the first laser 30 and the second laser 50 are parallel to each other.
[0045] When the deformation measuring device is working, such as Figure 4 As shown in Figure 5, the first laser 30 emits a first laser beam to illuminate point A, and the second laser 50 emits a second laser beam to illuminate point B. Since the first and second laser beams are parallel, the relative positions of the light-emitting points of the first laser 30 and the second laser 50 can be considered as the relative positions of points A and B. The indicator link 60 can be considered as the line connecting the light-emitting points of the first laser 30 and the second laser 50. Therefore, the angle α1 between the indicator link 60 and the horizontal direction can be considered as the angle α between the line connecting points A and B and the horizontal direction, which is also the angle between the side of the support 200 and the horizontal direction.
[0046] like Figure 6 As shown, based on the similar triangle relationship, the angle a1 between the indicator link 60 and the horizontal direction is equal to the angle a2 between the indicator link 60 and the straight side of the protractor 20. Therefore, the scale pointed to by the indicator tip at this time is the angle value of the angle a1 between the indicator link 60 and the horizontal direction, which is also the angle value between the side of the support 200 and the horizontal direction, thus reflecting the shear deformation angle value of the support 200.
[0047] The deformation measuring device of this utility model mainly consists of a protractor 20, a first fixing strip 10, a second fixing strip 40, a first laser 30, a second laser 50, and an indicating linkage 60. It eliminates the need for bulky or complex equipment, has a simple structure, is easy to assemble, and is less expensive. The first laser 30 and the second laser 50 provide higher positioning accuracy for the target point on the support 200, thus more accurately reflecting the relative position of the target point on the support 200. Furthermore, the visual scale on the protractor 20 allows the operator to immediately see the measurement results, enabling the operator to obtain the shear deformation angle of the support 200 in a single measurement, thereby making the measurement results more accurate and reliable.
[0048] When using this deformation measuring device, it can be placed close to the support 200, and the laser beam emitted by the laser can be aimed at the target point on the support 200. This eliminates the limitations of the confined space in the installation environment of the support 200, thus improving the convenience of the measurement process. Therefore, the deformation measuring device for bridge supports of this invention can achieve accurate measurement of the shear deformation angle value of the support 200 through a simple structure.
[0049] Specifically, such as Figure 3 and Figure 6As shown, the second fixing strip 40 is configured as a ruler, with its zero mark and the light-emitting point of the first laser 30 located on the same vertical line. As described in the previous embodiment, after the first laser beam illuminates point A of the support 200 and the second laser beam illuminates point B of the support 200, since the first and second laser beams are parallel, the relative positions of the light-emitting points of the first laser 30 and the second laser 50 can be considered as the relative positions of points A and B on the support 200. Therefore, by measuring the lateral distance between the light-emitting points of the first and second lasers, the lateral distance between points A and B can be determined, which is the outer bulge length of the support 200.
[0050] The zero mark of the second fixed strip 40 is located below the light-emitting point of the first laser 30. Since the first laser 30 cannot move laterally, the zero mark of the second fixed strip 40 can be used as the horizontal reference line for the light-emitting point of the first laser. In other words, the distance between the light-emitting point of the second laser 50 and the zero mark of the second fixed strip 40 is the horizontal distance W1 between the light-emitting point of the second laser 50 and the light-emitting point of the first laser 30. Therefore, by reading the corresponding scale value of the light-emitting point of the second laser 50 on the second fixed strip 40, the horizontal distance W1 between the light-emitting point of the second laser 50 and the light-emitting point of the first laser 30 can be directly obtained, and thus the outer drum length W of the support 200 can also be directly obtained. This further improves the effectiveness of the deformation measurement device.
[0051] For example, such as Figures 3 to 6 As shown, the deformation measuring device for the bridge bearing also includes a movable strip 70 and a third laser 80. The movable strip 70 is arranged side by side on the side of the first fixed strip 10 away from the protractor 20 and can move towards or away from the first fixed strip 10. The third laser 80 can be slidably mounted on the movable strip 70 along the longitudinal direction, and the laser beam emitted by the third laser 80 is parallel to the laser beam emitted by the first laser 30.
[0052] The movable strip 70 may or may not be connected to the first fixed strip 10; there is no restriction, as long as the movable strip 70 can move laterally relative to the first fixed strip 10. The third laser 80, in conjunction with the first laser 30, can measure the detachment length of the support 200. Specifically, during measurement, the first laser beam is first aligned with point A of the support 200. Then, by adjusting the positions of the movable strip 70 and the third laser 80, the third laser beam emitted by the third laser 80 is aligned with point C of the support 200. When the support 200 detaches, it typically begins to detach from the main beam from its outermost bulge position. Therefore, the lateral distance T between points A and C is the detachment length of the support 200.
[0053] Since the first laser beam and the third laser beam are parallel, after the first laser beam is aligned with point A of the support 200 and the third laser beam is aligned with point C of the support 200, the relative positions of the emission points of the first laser 30 and the third laser 80 can be considered as the relative positions of points A and C. Therefore, by simply measuring the lateral distance T1 between the emission points T1 of the first laser 30 and the third laser 80, the lateral distance T between points A and C can be obtained, which is the length of the support 200 freed up. This further improves the effectiveness of the deformation measurement device.
[0054] Specifically, such as Figure 3 and Figure 6 As shown, the deformation measuring device for the bridge bearing further includes a third fixed strip 90 and a sliding connector 91. The third fixed strip 90 is positioned above the first laser 30 and extends laterally. The sliding connector 91 is slidably mounted laterally on the first fixed strip 10. The top end of the movable strip 70 is connected to the sliding connector 91, allowing the movable strip 70 to move or stop synchronously with the sliding connector 91. The third fixed strip 90 supports the movement of the movable strip 70, improving its stability. The sliding connector 91, in sliding cooperation with the third fixed strip 90, guides the movement of the movable strip 70, preventing it from easily deviating from its trajectory.
[0055] In practical applications, such as Figure 3 and Figure 6 As shown, the third fixing strip 90 is set as a ruler, and the zero mark of the third fixing strip 90 and the light emission point of the first laser 30 are located on the same vertical line. The center of the sliding connector 91 and the light emission point of the third laser 80 are located on the same vertical line.
[0056] The zero mark of the third fixed bar 90 is located above the light-emitting point of the first laser 30. Since the first laser 30 cannot move laterally, the zero mark of the third fixed bar 90 can be used as the reference line of the light-emitting point of the first laser in the horizontal direction. The position of the center of the sliding connector 91 on the third fixed bar 90 can be regarded as the projection of the light-emitting point of the third laser 80 on the third fixed bar 90.
[0057] In other words, the distance between the center of the sliding connector 91 and the zero mark of the third fixed strip 90 is the lateral distance T1 between the light-emitting point of the third laser 80 and the light-emitting point of the first laser 30. Therefore, by reading the scale value corresponding to the center of the sliding connector 91 on the third fixed strip 90, the lateral distance T1 between the light-emitting points of the third laser 80 and the first laser 30 can be directly obtained, and thus the length T of the support 200 can also be directly obtained. This further improves the effectiveness of the deformation measurement device.
[0058] The protractor 20 and the first laser 30 can be connected to the first fixing strip 10 respectively, or they can be connected to the first fixing strip 10 through the same connector.
[0059] For example, the deformation measuring device for the bridge bearing further includes a first sliding joint, which is slidably mounted longitudinally on the first fixed strip 10. The first laser 30 is mounted on the first sliding joint, and the protractor 20 is connected to the first sliding joint. The first sliding joint can be used for both mounting the first laser 30 and connecting the protractor 20, thereby enabling the protractor 20 and the first laser 30 to move synchronously on the first fixed strip 10. This simplifies the mounting method of the protractor 20 and the first laser 30 on the first fixed strip 10 and ensures the synchronicity of their movement.
[0060] Specifically, such as Figure 3 As shown, the first fixing strip 10 is arranged in the shape of a strip plate, and the first fixing strip 10 has a first sliding groove 11 extending longitudinally. The first sliding post is slidably engaged with the first sliding groove 11. The engagement of the first sliding post with the first sliding groove 11 can increase the contact area between the first sliding post and the first fixing strip 10, thereby improving the installation stability and sliding stability of the first sliding post on the first fixing strip 10.
[0061] For example, such as Figure 3 As shown, the indicator link 60 has a second sliding groove 61, which extends along the length of the indicator link 60. The first sliding post is slidably engaged with the second sliding groove 61. The first sliding post can slide within the second sliding groove 61, thereby limiting the position of the indicator link 60 and improving the stability of the engagement between the first sliding post and the indicator link 60.
[0062] Specifically, the first fixing strip 10 is located behind the second fixing strip 40, the indicating rod 60 is located behind the first fixing strip 10, and the protractor 20 is located behind the indicating rod 60. The second fixing strip 40 has graduations for the operator to read; therefore, placing the second fixing strip 40 in front of the first fixing strip 10 prevents it from being obstructed, allowing the operator to read the graduations on the second fixing strip 40 promptly and effectively. The indicating rod 60 points to the graduations on the protractor 20 for the operator to read; therefore, placing the indicating rod 60 in front of the protractor 20 prevents the protractor 20 from obstructing the tip of the indicating rod 60, ensuring that both the tip of the indicating rod 60 and the graduations on the protractor 20 are visible to the operator, allowing the operator to read the angle value indicated by the indicating rod 60 promptly and effectively.
[0063] In practical applications, such as Figure 3 As shown, the deformation measuring device for the bridge bearing also includes a level 93, which is used to measure the levelness of the second fixing bar 40. The angle α1 between the indicating link 60 and the second fixing bar 40 reflects the angle α between the side of the bearing 200 and the horizontal direction. Therefore, during the measurement process of the deformation measuring device, the second fixing bar 40 needs to be kept level. The level 93 can measure the levelness of the second fixing bar 40, so that the operator can adjust the position of the deformation measuring device according to the current levelness to keep the second fixing bar 40 as level as possible, thereby improving the measurement accuracy of the deformation measuring device.
[0064] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A deformation measuring device for bridge bearings, characterized in that, include: The first fixing bar extends longitudinally; A protractor, which is slidably mounted longitudinally on the first fixing strip, the straight edge of the protractor extending longitudinally; A first laser is slidably mounted on the first fixed strip along the longitudinal direction and moves or stops synchronously with the protractor. The emission point of the first laser and the zero mark of the protractor are located on the same horizontal line. The first laser is used to emit a laser beam in a direction away from the protractor. The second fixing strip is located below the first laser and extends laterally. A second laser is slidably mounted on the second fixing strip in a lateral direction. The second laser is located in the horizontal direction on the side of the first laser away from the protractor. The laser beam emitted by the second laser is parallel to the laser beam emitted by the first laser. An indicator link extends along the line connecting the light emission points of the first laser and the second laser. One end of the indicator link is rotatably connected to the second laser, and the other end points to the scale line of the protractor. The indicator link is slidably connected to the first laser so that the angle between the indicator link and the horizontal direction changes as the positions of the first laser and the second laser change.
2. The deformation measuring device for bridge bearings as described in claim 1, characterized in that, The second fixing strip is set as a ruler, and the zero mark of the second fixing strip and the light-emitting point of the first laser are located on the same vertical line.
3. The deformation measuring device for bridge bearings as described in claim 1, characterized in that, The deformation measuring device for the bridge bearing also includes a movable strip and a third laser. The movable strip is arranged side by side on the side of the first fixed strip away from the protractor and can move towards or away from the first fixed strip. The third laser can be slidably mounted on the movable strip along the longitudinal direction, and the laser beam emitted by the third laser is parallel to the laser beam emitted by the first laser.
4. The deformation measuring device for bridge bearings as described in claim 3, characterized in that, The deformation measuring device for the bridge bearing also includes a third fixed strip and a sliding connector. The third fixed strip is located above the first laser and extends laterally. The sliding connector is slidably mounted on the first fixed strip laterally. The top end of the movable strip is connected to the sliding connector so that the movable strip moves or stops synchronously with the sliding connector.
5. The deformation measuring device for bridge bearings as described in claim 4, characterized in that, The third fixing strip is set as a ruler, and the zero mark of the third fixing strip and the light-emitting point of the first laser are located on the same vertical line. The center of the sliding connector and the light-emitting point of the third laser are located on the same vertical line.
6. The deformation measuring device for bridge bearings as described in any one of claims 1 to 5, characterized in that, The deformation measuring device for the bridge bearing also includes a first sliding joint column, which is slidably mounted longitudinally on the first fixing strip. The first laser is mounted on the first sliding joint column, and the protractor is connected to the first sliding joint column.
7. The deformation measuring device for bridge bearings as described in claim 6, characterized in that, The first fixing strip is arranged in the form of a strip plate, and the first fixing strip has a first sliding groove extending in the longitudinal direction, and the first sliding post is slidably engaged with the first sliding groove.
8. The deformation measuring device for bridge bearings as described in claim 6, characterized in that, The indicator link has a second sliding groove that extends along the length of the indicator link, and the first sliding post is slidably engaged with the second sliding groove.
9. The deformation measuring device for bridge bearings as described in claim 2, characterized in that, The first fixing bar is located behind the second fixing bar, the indicating link is located behind the first fixing bar, and the protractor is located behind the indicating link.
10. The deformation measuring device for bridge bearings as described in any one of claims 1 to 5, characterized in that, The deformation measuring device for the bridge bearing also includes a level, which is used to measure the levelness of the second fixing bar.