Bridge joint offset distance monitoring device

Abstract

The invention relates to the technical field of bridge joint monitoring, and discloses a bridge joint offset distance monitoring device. The device comprises a first sliding rail and a second sliding rail which are used for being arranged below two adjacent bridge span structures respectively, two abutting frames are arranged at the two ends of the first sliding rail, and judgment frames are arranged at the two ends of the second sliding rail; the first sliding rail and the second sliding rail are provided with the same movable shell, the shell is composed of an outer shell body and an inner shell body connected with the outer shell body in a telescopic mode, a wireless laser displacement sensor used for measuring the offset distance is arranged in the outer shell body, and a distance measuring feedback assembly is arranged in the inner shell body. According to the invention, the monitoring equipment can move in the bridge connecting seam, so that not only can the multi-point transverse offset distance measurement be performed on the connecting seam, but also the longitudinal offset distance measurement of the connecting seam can be realized, thereby ensuring the accuracy and diversity of bridge connecting seam monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge joint monitoring equipment, and in particular to a bridge joint offset distance monitoring device. Background Art

[0002] A bridge is mainly composed of piers and span structures erected on the piers, and the gap between two span structures is called a connection joint. The bridge connection joint is a gap in the bridge structure set to adapt to various deformations. It ensures the integrity of the bridge structure and the comfort of driving. It mainly includes three types: expansion joints, free joints and fixed joints. Under the influence of the external environment, the span structure of the bridge will shift. In order for engineers to judge the health status of the bridge structure and formulate corresponding maintenance and reinforcement measures to ensure the safety and stability of the bridge, the bridge connection joints are generally monitored. At present, the bridge connection joints are mainly monitored through GNSS displacement monitoring equipment and displacement sensors.

[0003] Among them, GNSS displacement monitoring equipment is a device that can use the global navigation satellite system (GNSS) technology to perform high-precision displacement measurements. It receives navigation signals from satellites through the built-in GNSS antenna. These signals contain location information such as longitude, latitude, and altitude. The received signals are analyzed and calculated by the processing module inside the device to obtain the precise location information of the structure, thereby realizing the monitoring of bridge joints. However, it also has problems such as being limited by satellite signals, difficulty in data analysis, and the need for stable monitoring points.

[0004] The displacement sensor is relatively simple. Generally, it only needs to be installed in the joint. Once the bridge span structure is displaced, the monitoring result can be obtained. For example, the related technology (CN116379933A) discloses a monitoring device for measuring the offset distance of a bridge joint, including a bridge joint body, the left side of the bridge joint body is connected to a first bridge deck, and the right side of the bridge joint body is connected to a second bridge deck. Monitoring components are installed on the lower sides of the first bridge deck and the second bridge deck. The laser rangefinder and the irradiation plate can monitor the distance between the left and right vertical plates at all times, so as to monitor the offset distance of the bridge joint at all times. When the offset distance of the bridge joint is too large, the monitored value will be transmitted to the central control processor, and then the abnormal value will be transmitted to the equipment in the monitoring room through the wireless transceiver for observation by the monitoring personnel, avoiding the problem that the bridge joint cannot be monitored in the original method and cannot be monitored in real time when an offset occurs inside the bridge joint. ‌

[0005] However, in the existing technical solutions, the offset distance monitoring of the bridge connection joint by using a laser rangefinder can generally only be used to monitor the lateral offset data between the two span structures (that is, to monitor the width of the connection joint, the distance between the two span structures), but it cannot monitor the longitudinal offset data of the two span structures (the longitudinal offset means that the connecting ends of the two span structures are offset, resulting in them not being on the same horizontal axis and unable to maintain alignment). In addition, the laser rangefinder is generally only placed at a specific position, with relatively few measuring points, so the obtained measurement data is not comprehensive and accurate enough. Therefore, it is necessary to propose a bridge connection joint offset distance monitoring device that can simultaneously realize two monitoring methods. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a bridge joint offset distance monitoring device.

[0007] The present invention is implemented by the following technical scheme: a first slide rail and a second slide rail are respectively used to be arranged under two adjacent bridge span structures, two abutment frames are arranged at both ends of the first slide rail, and judgment frames are arranged at both ends of the second slide rail, and the same movable shell is installed on the first slide rail and the second slide rail, and the shell is composed of an outer shell and an inner shell telescopically connected to the outer shell, a wireless laser displacement sensor for offset distance measurement is arranged in the outer shell, and a ranging feedback component is arranged in the inner shell, and the ranging feedback component includes a first feedback frame that can be retracted and reset and is provided with a 45-degree angle inclined surface, and a relative to the wireless laser displacement sensor is slidably installed on the first feedback frame. A second feedback frame is provided in a different position from the first feedback frame and made of a different material, so that the wireless laser displacement sensor can distinguish and process the laser signals fed back by objects of different materials, thereby performing lateral offset distance and longitudinal offset distance measurement of the connection seam together. A first telescopic and resettable distance measuring block is provided in the inner shell, and the second feedback frame is telescopically connected to the first distance measuring block. A wheel for pushing the first feedback frame to move is provided on the first distance measuring block, and the wheel contacts the inclined surface on the first feedback frame, so that the wireless laser displacement sensor can monitor the lateral offset distance of the bridge connection seam through the second feedback frame, and can monitor the longitudinal offset spacing of the bridge connection seam through the first feedback frame.

[0008] As a further improvement of the above scheme, a first pulley block is fixedly installed on one side of the outer shell, the first pulley block is in the first slide rail, and a motor for driving the first pulley block is fixedly installed in the outer shell, so that the monitoring equipment can perform multi-point offset spacing monitoring of the bridge connection joint through regular movement.

[0009] As a further improvement of the above solution, a second pulley block is hingedly installed on one side of the inner shell, and the second pulley block is located in the second slide rail, so that the monitoring equipment can adapt to the angle change after the two bridge span structures are offset.

[0010] As a further improvement of the above scheme, two positioning rods are fixedly installed on the inner wall of the outer shell, one end of the two positioning rods extends into the inner shell and is slidably connected to the inner shell, and a first spring is sleeved on the two positioning rods, and the two ends of the first spring are respectively against the inner wall of the outer shell and one side of the inner shell, so that the reverse thrust formed can enable the outer shell and the inner shell to better adapt to and synchronize the spacing changes of the two adjacent bridge span structures.

[0011] As a further improvement of the above scheme, two reverse thrust reset mechanisms are respectively installed on both sides of the inner shell, and the reverse thrust reset mechanism includes a fixed plate, a sliding rod fixedly installed on the fixed plate, and a second spring slidably sleeved on the sliding rod. The two sliding rods both pass through the first feedback frame and are slidably connected to the first feedback frame. One end of the two second springs both resists the first feedback frame, so that the first feedback frame can rebound and reset after being squeezed and moved.

[0012] As a further improvement of the above scheme, a groove is provided at one end of the first measuring block, and a first rack is provided on the top inner wall of the groove. A positioning frame is fixedly installed on the inner shell, and one end of the positioning frame extends into the groove and is slidably connected to the groove. A second measuring block is slidably installed in the positioning frame, and a second rack is provided on the top of the second measuring block. A transmission gear that meshes with the first rack and the second rack at the same time is rotatably installed in the positioning frame, so that the second measuring block can realize the secondary longitudinal offset spacing measurement of the bridge connection seam.

[0013] As a further improvement of the above solution, a connecting frame is telescopically installed on the second feedback frame, and the connecting frame is fixedly connected to the first ranging block, so that the first ranging block can not only drive the second feedback frame to move, so that the laser signal on the wireless laser displacement sensor can be irradiated onto the first feedback frame, but also can smoothly push the first feedback frame forward equidistantly through the resistance wheel.

[0014] As a further improvement of the above scheme, a fixed frame that can move in parallel is arranged inside the outer shell, the wireless laser displacement sensor is fixedly connected to the fixed frame, a two-way telescopic frame is rotatably installed on the inner wall of the bottom of the inner shell, and two telescopic bars at both ends of the two-way telescopic frame are respectively rotatably connected to the first ranging block and the bottom of the fixed frame, so that when the first ranging block drives the second feedback frame to move, it can also drive the fixed frame and the wireless laser displacement sensor to move in the opposite direction through the two-way telescopic frame, so as to ensure that when the displacement interval of the first ranging block is small, the laser signal of the wireless laser displacement sensor can also be smoothly irradiated onto the first feedback frame.

[0015] As a further improvement of the above solution, a wireless terminal with a power socket is fixedly installed on any one of the brackets on the first slide rail, and a battery with a plug is provided at the bottom of the shell, so that the wireless laser displacement sensor can ensure endurance during monitoring and is not restricted by the connecting wire.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By respectively arranging a first slide rail and a second slide rail on two bridge span structures, arranging a movable and retractable shell on the first slide rail and the second slide rail, arranging a second feedback frame on the inner shell of the shell, and arranging a wireless laser displacement sensor for spacing monitoring in the outer shell of the shell, the shell can change with the spacing change of the bridge joint, and the spacing between the second feedback frame and the wireless laser displacement sensor also changes synchronously with the expansion and contraction of the outer shell and the inner shell, so that the wireless laser displacement sensor can judge the lateral offset spacing change of the bridge joint through the position change of the second feedback frame, thereby not only the lateral offset monitoring of the bridge joint can be performed, but also the movable characteristic enables it to perform multi-point offset distance monitoring of the entire bridge joint. Compared with setting the displacement sensor at a specific position, it has more monitoring points and can obtain more measurement data, thereby ensuring higher measurement accuracy, and the wireless laser displacement sensor is set in the shell, which makes the wireless laser displacement sensor not interfered by external environment such as dust and light, thereby ensuring measurement accuracy; By arranging a first distance measuring block, a stopper wheel, a first feedback frame that can move in cooperation with a second feedback frame, and a stopper frame and a determination frame arranged on the first slide rail and the second slide rail in the inner shell of the shell, the mobile monitoring method of the monitoring device can not only obtain more monitoring data, but also measure the longitudinal offset spacing of the bridge joint according to the contact between the first distance measuring block and the determination frame, and in order to allow the wireless laser displacement sensor to classify and determine the monitoring data, the wireless laser displacement sensor can distinguish and process the laser signals fed back according to different materials, and the first feedback frame and the second feedback frame are set to two different materials, and the first feedback frame and the second feedback frame can also automatically realize displacement switching, so that one wireless laser displacement sensor can realize two types of data monitoring; By arranging a second distance measuring block in the inner shell that can be mutually transmission-coordinated with the first distance measuring block, the monitoring device can perform a second measurement of the longitudinal offset data of the bridge joint when returning to the initial position, and the monitoring data can be made more accurate through two measurements; In order to avoid the longitudinal offset distance being too small, which causes the second feedback frame to be unable to move away from the front of the wireless laser displacement sensor, a bidirectional telescopic frame is set as a lever for the first ranging block to move the wireless laser displacement sensor, so that when the first ranging block drives the second feedback frame to move away, it will also drive the wireless laser displacement sensor to move in the opposite direction through the bidirectional telescopic frame, so that the two can be staggered, allowing the wireless laser displacement sensor to successfully irradiate the first feedback frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an overall display diagram of the bridge joint offset distance monitoring device of the present invention; Figure 2 This is a first disassembled display diagram of the bridge joint offset distance monitoring device of the present invention; Figure 3 A cross-section diagram of the bridge joint offset distance monitoring device of the present invention; Figure 4 It is a top plan cross-sectional illustration of the bridge joint offset distance monitoring device of the present invention; Figure 5 This is a second disassembled display diagram of the bridge joint offset distance monitoring device of the present invention; Figure 6 This is a separate display diagram of the ranging feedback component; Figure 7 This is a disassembled cross-sectional view of the ranging feedback component; Figure 8 It is a layout diagram of the bridge joint offset distance monitoring device of the present invention; Fig. 9 It is a diagram showing the morphological changes of the monitoring device at different monitoring positions and monitoring states.

[0018] Description of main symbols: 1. First slide rail; 2. Support frame; 3. Wireless terminal; 4. Second slide rail; 5. Judgment frame; 6. Outer shell; 7. Inner shell; 8. Battery; 9. First pulley block; 10. Second pulley block; 11. Motor; 12. First distance measuring block; 13. Support wheel; 14. First feedback frame; 15. Inclined plane; 16. Second feedback frame; 17. Positioning frame; 18. Second distance measuring block; 19. Transmission gear; 20. Wireless laser displacement sensor; 21. Bidirectional telescopic frame; 22. Fixed frame. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0020] Please combine Figures 1 to 9The bridge joint offset distance monitoring device comprises: a first slide rail 1 and a second slide rail 4 respectively used to be placed under two adjacent bridge span structures, two brackets 2 are arranged at both ends of the first slide rail 1, and a determination bracket 5 is arranged at both ends of the second slide rail 4. The forms of the first slide rail 1 and the second slide rail 4 are not fixed, and they can be adaptively adjusted according to the positions installed on the bridge span structure. A wireless terminal 3 with a power supply socket is fixedly installed on any bracket 2 on the first slide rail 1, and a battery 8 with a plug is arranged at the bottom of the housing 6, so that the wireless laser displacement sensor 20 can ensure endurance during monitoring and is not restricted by the connection line; The first slide rail 1 and the second slide rail 4 are provided with a same movable shell, which is composed of an outer shell 6 and an inner shell 7 telescopically connected to the outer shell 6. Two positioning rods are fixedly installed on the inner wall of the outer shell 6, one end of each of the two positioning rods extends into the inner shell 7 and is slidably connected to the inner shell 7. A first spring is sleeved on each of the two positioning rods, and the two ends of the first spring respectively abut against the inner wall of the outer shell 6 and one side of the inner shell 7, so that the reverse thrust formed can make the outer shell 6 and the inner shell 7 better adapt to and synchronize the spacing change of two adjacent bridge span structures. A wireless laser displacement sensor 20 for offset distance measurement is provided in the outer shell 6, and a distance measurement feedback component is provided in the inner shell 7; The selection of the wireless laser displacement sensor 20 can ensure that the sensor is not bound by the connecting wire, and a sensor with a connecting wire can also be selected.

[0021] Through the above technical scheme, the shell can change with the spacing change of the bridge connection seam, and the spacing between the second feedback frame 16 and the wireless laser displacement sensor 20 changes synchronously with the expansion and contraction of the outer shell 6 and the inner shell 7, so that the wireless laser displacement sensor 20 can judge the lateral offset spacing change of the bridge connection seam through the position change of the second feedback frame 16, so that not only the lateral offset of the bridge connection seam can be monitored, but also the movable characteristic also enables it to perform multi-point offset distance monitoring of the entire bridge connection seam. Compared with setting the displacement sensor at a specific position, it has more monitoring points and can obtain more measurement data, thereby ensuring higher measurement accuracy. In addition, the wireless laser displacement sensor 20 is set in the shell, which makes the wireless laser displacement sensor 20 not affected by external environment such as dust and light, thereby ensuring measurement accuracy.

[0022] The ranging feedback component includes a first feedback frame 14 that is retractable and resettable and is provided with a 45-degree angle inclined surface 15. A second feedback frame 16 that is opposite to the wireless laser displacement sensor 20 and is made of a different material from the first feedback frame 14 is slidably installed on the first feedback frame 14. A slide groove is arranged above the first feedback frame 14, and a slider extending into the slide groove is arranged on the second feedback frame 16, so that the second feedback frame 16 can not only move forward with the first feedback frame 14, but also move horizontally with the first ranging block 12, so that the wireless laser displacement sensor 20 can distinguish and process the laser signals fed back by objects of different materials, so as to measure the lateral offset distance and the longitudinal offset distance of the connection seam together. A retractable and resettable first ranging block 12 is arranged in the inner shell 7, and the second feedback frame 16 is telescopically connected to the first ranging block 12. A connecting frame is telescopically installed on the second feedback frame 16, and the connecting frame is fixedly connected to the first ranging block 12. In this way, the first distance measuring block 12 can not only drive the second feedback frame 16 to move, so that the laser signal on the wireless laser displacement sensor 20 can be irradiated on the first feedback frame 14, but also can smoothly push the first feedback frame 14 to move forward equidistantly through the wheel 13. The first distance measuring block 12 is provided with a wheel 13 for pushing the first feedback frame 14 to move, and the wheel 13 contacts the inclined surface 15 on the first feedback frame 14. One end of the first distance measuring block 12 is provided with a groove, and the top inner wall of the groove is provided with a first rack. A positioning frame 17 is fixedly installed on the inner shell 7, and one end of the positioning frame 17 extends into the groove and is slidably connected to the groove. A second distance measuring block 18 is slidably installed in the positioning frame 17, and a second rack is provided on the top of the second distance measuring block 18. A transmission gear 19 that meshes with the first rack and the second rack at the same time is rotatably installed in the positioning frame 17, so that the second distance measuring block 18 can realize the secondary longitudinal offset spacing measurement of the bridge connection seam; Through the above technical scheme, the mobile monitoring method of the monitoring equipment can not only obtain more monitoring data, but also measure the longitudinal offset spacing of the bridge joint according to the contact between the first ranging block 12 and the determination frame 5. In order to allow the wireless laser displacement sensor 20 to classify and determine the monitoring data, the wireless laser displacement sensor 20 can distinguish and process the laser signals fed back according to different materials. The first feedback frame 14 and the second feedback frame 16 are set to two different materials, and the first feedback frame 14 and the second feedback frame 16 can also automatically realize displacement switching, so that one wireless laser displacement sensor 20 can realize two types of data monitoring.

[0023] Furthermore, since the inclined surface 15 on the first feedback frame 14 is at an angle of 45 degrees, the inclined surface 15 is regarded as the diagonal of a square. When an object moves from one end of the diagonal to the other end, the actual lateral movement distance and longitudinal movement distance of the object are equal. Therefore, the first feedback frame 14 moves the same distance on the Y axis as the first distance measuring block 12 moves along the X axis.

[0024] In this way, the wireless laser displacement sensor 20 can monitor the lateral offset distance of the bridge joint through the second feedback frame 16, and can monitor the longitudinal offset spacing of the bridge joint through the first feedback frame 14. When the lateral offset spacing of the bridge joint is monitored, the spacing between the second feedback frame 16 and the wireless laser displacement sensor 20 is mainly controlled by the telescopic spacing between the outer shell 6 and the inner shell 7, and the telescopic spacing between the outer shell 6 and the inner shell 7 is controlled by the first slide rail 1 and the second slide rail 4 fixedly connected to the bridge span structure, and the spacing between the first slide rail 1 and the second slide rail 4 is determined by the spacing between the two bridge span structures.

[0025] A first pulley block 9 is fixedly installed on one side of the outer shell 6, and the first pulley block 9 is located in the first slide rail 1. A motor 11 for driving the first pulley block 9 is fixedly installed in the outer shell 6, so that the monitoring equipment can perform multi-point offset spacing monitoring of the bridge connection joint through regular movement. A second pulley block 10 is hingedly installed on one side of the inner shell 7, and the second pulley block 10 is located in the second slide rail 4, so that the monitoring equipment can adapt to the angle change after the two span structures are offset.

[0026] Two reverse thrust reset mechanisms are respectively installed on both sides of the inner shell 7, and the reverse thrust reset mechanism includes a fixed plate, a sliding rod fixedly installed on the fixed plate, and a second spring slidably sleeved on the sliding rod. The two sliding rods both penetrate the first feedback frame 14 and are slidably connected to the first feedback frame 14. One end of the two second springs both abuts against the first feedback frame 14, so that the first feedback frame 14 can rebound and reset after being squeezed and moved. The first feedback frame 14 and the second feedback frame 16 rebound and reset through the reverse thrust reset mechanism, and the first distance measuring block 12 rebounds and resets through the reverse thrust applied in the reverse direction after the first feedback frame 14 rebounds, and the second distance measuring block 18 relies on the transmission between it and the first distance measuring block 12 to achieve synchronous reset.

[0027] A parallel movable fixed frame 22 is arranged inside the outer shell 6, and the wireless laser displacement sensor 20 is fixedly connected to the fixed frame 22. A bidirectional telescopic frame 21 is rotatably mounted on the bottom inner wall of the inner shell 7. The bidirectional telescopic frame 21 is composed of a sleeve shell in the middle and two telescopic strips slidably mounted in the sleeve. The two telescopic strips at both ends of the bidirectional telescopic frame 21 are respectively rotatably connected to the first ranging block 12 and the bottom of the fixed frame 22, so that when the first ranging block 12 drives the second feedback frame 16 to move, it can also drive the fixed frame 22 and the wireless laser displacement sensor 20 to move in the opposite direction through the bidirectional telescopic frame 21, so as to ensure that when the displacement interval of the first ranging block 12 is small, the laser signal of the wireless laser displacement sensor 20 can also be smoothly irradiated onto the first feedback frame 14, and the telescopic characteristics of the bidirectional telescopic frame 21 also enable it to adapt to the telescopic changes of the outer shell 6 and the inner shell 7.

[0028] The implementation principle of a bridge joint offset distance monitoring device in the embodiment of the present application is: During deployment, the first slide rail 1 and the second slide rail 4 can be deployed below the ends of the two bridge span structures close to each other according to actual needs, or installed at the ends of the two bridge span structures close to each other. Generally, the end where the wireless terminal 3 is installed is used as the initial end. The monitoring device is usually at the initial end, and the plug on the battery 8 at the bottom is connected to the socket on the wireless terminal 3 to ensure continuous power supply and charge the battery 8. Since the wireless terminal 3 is in a fixed state, it can be connected to the outside world by wire. Furthermore, during deployment, the first slide rail 1 and the second slide rail 4 need to remain stable and corresponding, and the brackets 2 and the judging brackets 5 installed thereon also need to remain corresponding, so that the distance between the first slide rail 1 and the second slide rail 4 is used as a criterion for determining the lateral offset distance of the bridge joint, and the two brackets 2 and the two judging brackets 5 are used as a criterion for determining the longitudinal offset distance of the bridge joint; A specific monitoring interval is set for the monitoring device. It is generally recommended to monitor once every 24 hours. During monitoring, the motor 11 drives the first pulley group 9 to move, thereby driving the monitoring device to move, so that the monitoring device moves from one end of the bridge joint to the other end and then returns. During this process, the outer shell 6 and the inner shell 7 will determine the lateral offset spacing of the bridge joint according to the width of the bridge joint (the spacing between the two span structures); When the outer shell 6 of the monitoring device abuts against the support frame 2 away from the wireless terminal 3, the first distance measuring block 12 on the inner shell 7 will also abut against the judgment frame 5. At this time, the first distance measuring block 12 will drive the support wheel 13 to push the inclined surface 15 of the first feedback frame 14 while shrinking and moving, so that the first feedback frame 14 moves the same distance in the direction of the outer shell 6. At the same time, while the second feedback frame 16 follows the first feedback frame 14 to move forward, the first distance measuring block 12 will also drive it to move horizontally through the connecting frame, so that the second feedback frame 16 is moved away, so that the wireless laser displacement sensor 20 can directly irradiate the first feedback frame 14. Since the material of the first feedback frame 14 is different from that of the first feedback frame 14, the wireless laser displacement sensor 20 is not The laser signals fed back from objects of the same material are differentiated and processed, and switched to the longitudinal offset monitoring of the bridge joint. Once the two span structures have a longitudinal offset, the moving distance of the first ranging block 12 after it reaches the judgment frame 5 changes. If, under normal circumstances, the moving distance of the first ranging block 12 is 1 cm, then once the first slide rail 1 or the second slide rail 4 follows the longitudinal offset of the corresponding span structure, the moving distance of the first ranging block 12 will be greater than or less than 1 cm. In order to ensure the accuracy of the measurement data, when the monitoring equipment returns to the initial position, the second ranging block 18 will be squeezed by the initial position judgment frame 5 and will drive the first ranging block 12 to push the first feedback frame 14 again through the transmission gear 19, so as to achieve secondary measurement.

[0029] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A bridge joint offset distance monitoring device, characterized in that: include: A first slide rail (1) and a second slide rail (4) respectively arranged under two adjacent bridge span structures, two support frames (2) being arranged at both ends of the first slide rail (1), and a determination frame (5) being arranged at both ends of the second slide rail (4); The first slide rail (1) and the second slide rail (4) are mounted with a same movable housing, the housing comprising an outer housing (6) and an inner housing (7) telescopically connected to the outer housing (6), a wireless laser displacement sensor (20) for measuring offset distance is arranged in the outer housing (6), and a distance measurement feedback component is arranged in the inner housing (7); The distance measurement feedback component comprises a first feedback frame (14) which is retractable and resettable and is provided with a 45-degree angle inclined surface (15); a second feedback frame (16) which is slidably mounted on the first feedback frame (14) and is positioned opposite to the wireless laser displacement sensor (20) and is made of a material different from that of the first feedback frame (14), so that the wireless laser displacement sensor (20) can distinguish and process laser signals fed back by objects of different materials, thereby performing lateral offset distance measurement and longitudinal offset distance measurement of the connection seam at the same time; A telescopically repositionable first distance measuring block (12) is disposed in the inner shell (7); the second feedback frame (16) is telescopically connected to the first distance measuring block (12); a wheel (13) for pushing the first feedback frame (14) to move is disposed on the first distance measuring block (12); the wheel (13) is in contact with an inclined surface (15) on the first feedback frame (14); thereby, the wireless laser displacement sensor (20) can monitor the lateral offset distance of the bridge connection joint through the second feedback frame (16), and can monitor the longitudinal offset distance of the bridge connection joint through the first feedback frame (14).

2. The bridge joint offset distance monitoring device according to claim 1, characterized in that: A first pulley block (9) is fixedly mounted on one side of the housing (6), the first pulley block (9) is located in the first slide rail (1), and a motor (11) for driving the first pulley block (9) is fixedly mounted in the housing (6), so that the monitoring device can monitor the multi-point offset spacing of the bridge joint by regular movement.

3. The bridge joint offset distance monitoring device according to claim 1, characterized in that: A second pulley block (10) is hingedly mounted on one side of the inner shell (7), and the second pulley block (10) is located in the second slide rail (4), so that the monitoring device can adapt to the angle change after the two bridge span structures are offset.

4. The bridge joint offset distance monitoring device according to claim 1, characterized in that: Two positioning rods are fixedly mounted on the inner wall of the outer shell (6), one end of each of the two positioning rods extends into the inner shell (7) and is slidably connected to the inner shell (7), and a first spring is sleeved on each of the two positioning rods, the two ends of the first spring respectively abut against the inner wall of the outer shell (6) and one side of the inner shell (7), so that the reverse thrust formed can enable the outer shell (6) and the inner shell (7) to better adapt to and synchronize the spacing changes of the two adjacent bridge span structures.

5. The bridge joint offset distance monitoring device according to claim 1, characterized in that: Two reverse thrust reset mechanisms are respectively installed on both sides of the inner shell (7), and the reverse thrust reset mechanisms include a fixed plate, a sliding rod fixedly installed on the fixed plate, and a second spring slidably sleeved on the sliding rod. The two sliding rods both penetrate the first feedback frame (14) and are slidably connected to the first feedback frame (14). One end of the two second springs both abuts against the first feedback frame (14), so that the first feedback frame (14) can rebound and reset after being squeezed and moved.

6. The bridge joint offset distance monitoring device according to claim 1, characterized in that: A groove is provided at one end of the first distance measuring block (12), a first rack is provided on the top inner wall of the groove, a positioning frame (17) is fixedly mounted on the inner shell (7), one end of the positioning frame (17) extends into the groove and is slidably connected to the groove, a second distance measuring block (18) is slidably mounted in the positioning frame (17), a second rack is provided on the top of the second distance measuring block (18), and a transmission gear (19) meshing with the first rack and the second rack is rotatably mounted in the positioning frame (17), so that the second distance measuring block (18) can achieve secondary measurement of the spacing of the longitudinal offset of the bridge joint.

7. The bridge joint offset distance monitoring device according to claim 1, characterized in that: A connecting frame is telescopically mounted on the second feedback frame (16), and the connecting frame is fixedly connected to the first distance measuring block (12), so that the first distance measuring block (12) can not only drive the second feedback frame (16) to move, so that the laser signal on the wireless laser displacement sensor (20) can be irradiated onto the first feedback frame (14), but can also smoothly push the first feedback frame (14) to move forward equidistantly through the stop wheel (13).

8. The bridge joint offset distance monitoring device according to claim 1, characterized in that: A parallel-movable fixing frame (22) is arranged inside the outer shell (6), the wireless laser displacement sensor (20) is fixedly connected to the fixing frame (22), a bidirectional telescopic frame (21) is rotatably mounted on the inner wall of the bottom of the inner shell (7), two telescopic bars at both ends of the bidirectional telescopic frame (21) are rotatably connected to the first distance measuring block (12) and the bottom of the fixing frame (22), respectively, so that when the first distance measuring block (12) drives the second feedback frame (16) to move, it can also drive the fixing frame (22) and the wireless laser displacement sensor (20) to move in the opposite direction through the bidirectional telescopic frame (21), so as to ensure that when the displacement interval of the first distance measuring block (12) is small, the laser signal of the wireless laser displacement sensor (20) can also be smoothly irradiated onto the first feedback frame (14).

9. The bridge joint offset distance monitoring device according to claim 1, characterized in that: A wireless terminal (3) with a power supply socket is fixedly mounted on any one of the brackets (2) on the first slide rail (1), and a storage battery (8) with a plug is arranged at the bottom of the housing (6), so that the wireless laser displacement sensor (20) can ensure endurance during monitoring and is not restricted by a connecting line.

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