Bridge joint offset distance monitoring device

Abstract

The present application relates to bridge joint monitoring technical field, disclose a kind of bridge joint offset distance monitoring device.The present application includes first slide rail and second slide rail for being respectively arranged below two adjacent bridge span structures, two ends of the first slide rail are provided with two abutments, the two ends of the second slide rail are provided with determination frame;The same movable shell is installed on the first slide rail and second slide rail, the shell is composed of shell and inner shell telescopically connected with shell, wireless laser displacement sensor for carrying out offset distance measurement is arranged in the shell, ranging feedback component is arranged in the inner shell.The present application allows monitoring equipment to move in bridge joint, so that not only can the joint be measured multiple point lateral offset spacing, but also the longitudinal offset spacing measurement of joint can be realized, so as to ensure the accuracy and diversity of bridge joint monitoring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge joint monitoring devices, and particularly relates to a bridge joint offset distance monitoring device. BACKGROUND

[0002] A bridge is mainly composed of a pier and a bridge span structure erected on the pier, and a gap between two bridge span structures is called a joint. The bridge joint is a gap provided in the bridge structure to adapt to various deformations, which ensures the integrity of the bridge structure and the comfort of driving. There are mainly three types of joints, namely expansion joints, free joints and fixed joints. Under the influence of the external environment, the bridge span structure will deviate. In order to enable engineers to judge the health status of the bridge structure and accordingly develop corresponding maintenance and reinforcement measures to ensure the safety and stability of the bridge, the bridge joint is generally monitored. At present, GNSS displacement monitoring equipment and displacement sensors are mainly used to monitor the bridge joint.

[0003] The GNSS displacement monitoring equipment is a device capable of high-precision displacement measurement by using global navigation satellite system (GNSS) technology. The GNSS antenna built-in the device receives navigation signals from satellites. The signals contain position information such as longitude, latitude and altitude. The received signals are analyzed and calculated by the processing module inside the device to obtain the accurate position information of the structure, thereby achieving the monitoring of the bridge joint. However, the device has problems such as being limited by satellite signals, being difficult to analyze data, and needing stable monitoring points.

[0004] The displacement sensor is relatively simple. It generally only needs to be installed in the joint. Once the bridge span structure deviates, 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. The monitoring device comprises a bridge joint body, a first bridge deck connected to the left side of the bridge joint body, a second bridge deck connected to the right side of the bridge joint body, a monitoring assembly installed on the lower side of the first bridge deck and the second bridge deck, a laser range finder and an irradiation plate are arranged to monitor the distance between the left vertical plate and the right vertical plate at any time, so as to monitor the offset distance of the bridge joint at any time. When the offset distance of the bridge joint is too large, the monitoring value is transmitted to the central control processor, and then the abnormal value is transmitted to the equipment in the monitoring room through the wireless transceiver, so as to be observed by the monitoring personnel, thereby avoiding the problem that the original method cannot monitor the bridge joint and cannot monitor the deviation in the bridge joint in time.

[0005] However, in the prior art, the laser range finder is used to monitor the offset distance of the bridge joint, which can only be used to monitor the lateral offset data between the two bridge spans (i.e., the width of the joint), but cannot monitor the longitudinal offset data between the two bridge spans (the longitudinal offset causes the joint end of the two bridge spans to deviate from the same horizontal axis and cannot be aligned), and the laser range finder is generally placed at a specific position, and the measurement points are relatively few, so that the measurement data obtained is not comprehensive and accurate, and therefore, it is necessary to provide a bridge joint offset distance monitoring device that can realize both monitoring methods. SUMMARY

[0006] To solve the above technical problems, the present application provides a bridge joint offset distance monitoring device.

[0007] The present application adopts the following technical solutions: a first sliding rail and a second sliding rail are respectively arranged under two adjacent bridge spans, two abutments are arranged at the two ends of the first sliding rail, and a determination frame is arranged at the two ends of the second sliding rail, a movable shell is mounted on the first sliding rail and the second sliding rail, the shell is composed of an outer shell and an inner shell connected with the outer shell in an extension mode, a wireless laser displacement sensor for measuring the offset distance is arranged in the outer shell, a distance measuring feedback assembly is arranged in the inner shell, the distance measuring feedback assembly includes a first feedback frame which is stretchable and resettable and is provided with a 45-degree inclined surface, a second feedback frame which is opposite to the wireless laser displacement sensor and is different in material from the first feedback frame is slidingly mounted on the first feedback frame, so that the wireless laser displacement sensor can distinguish and process the laser signals fed back by different materials, so as to simultaneously measure the lateral offset distance and the longitudinal offset distance of the joint, a first distance measuring block which is stretchable and resettable is arranged in the inner shell, the second feedback frame is connected with the first distance measuring block in an extension mode, a stop wheel for pushing the first feedback frame to move is arranged on the first distance measuring block, and the stop wheel is in contact with the inclined surface on the first feedback frame, so that the wireless laser displacement sensor can monitor the lateral offset distance of the bridge joint through the second feedback frame and can monitor the longitudinal offset distance of the bridge joint through the first feedback frame.

[0008] As a further improvement of the above-mentioned scheme, a first pulley set is fixedly installed on one side of the outer shell, the first pulley set is located in the first sliding rail, and a motor for driving the first pulley set is fixedly installed in the outer shell, so that the monitoring device can monitor the offset distance of the bridge joint at multiple points by moving regularly.

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

[0010] As a further improvement of the above-mentioned scheme, two positioning rods are fixedly mounted on the inner wall of the outer shell, one end of each of the two positioning rods extends into the inner shell and is in sliding connection with the inner shell, a first spring is sleeved on each of the two positioning rods, and two ends of the first spring are respectively in abutment with the inner wall of the outer shell and one side of the inner shell, so that the counter thrust formed thereby can make the outer shell and the inner shell better adapt to and synchronize the spacing change of the two adjacent bridge span structures.

[0011] As a further improvement of the above-mentioned scheme, two counter-thrust reset mechanisms are respectively mounted on the two sides of the inner shell, each of the counter-thrust reset mechanisms comprises a fixed plate, a sliding rod fixedly mounted on the fixed plate, and a second spring slidingly sleeved on the sliding rod, the two sliding rods each penetrate through and are in sliding connection with the first feedback frame, and one end of each of the two second springs is in abutment with the first feedback frame, so that the first feedback frame can be reset after being extruded and moved.

[0012] As a further improvement of the above-mentioned scheme, a groove is arranged at one end of the first distance measuring block, a first rack is arranged on the top inner wall of the groove, a positioning frame is fixedly mounted on the inner shell, one end of the positioning frame extends into the groove and is in sliding connection with the groove, a second distance measuring block is slidingly mounted in the positioning frame, a second rack is arranged on the top of the second distance measuring block, and a transmission gear rotatingly mounted in the positioning frame is in meshing connection with the first rack and the second rack, so that the second distance measuring block can measure the secondary longitudinal offset spacing of the bridge joint.

[0013] As a further improvement of the above-mentioned scheme, a connecting frame is telescopically mounted on the second feedback frame, and the connecting frame is fixedly connected with the first distance measuring block, so that the first distance measuring block can not only drive the second feedback frame to move, so that the laser signal on the wireless laser displacement sensor can irradiate onto the first feedback frame, but also can smoothly push the first feedback frame to move equidistantly forward by the abutting wheel.

[0014] As a further improvement of the above-mentioned scheme, a fixed frame capable of parallel movement is arranged inside the outer shell, the wireless laser displacement sensor is fixedly connected with the fixed frame, a bidirectional telescopic frame is rotatingly mounted on the bottom inner wall of the inner shell, and two telescopic rods at the two ends of the bidirectional telescopic frame are respectively rotatingly connected with the first distance measuring block and the bottom of the fixed frame, so that when the first distance measuring block drives the second feedback frame to move, the fixed frame and the wireless laser displacement sensor can also be driven by the bidirectional telescopic frame to move in the opposite direction, so as to ensure that when the displacement spacing of the first distance measuring block is small, the laser signal of the wireless laser displacement sensor can also smoothly irradiate onto the first feedback frame.

[0015] As a further improvement of the above scheme, any one of the first slide rail is fixedly installed with a wireless terminal with a power socket, and the bottom of the shell is provided with a battery with a plug, so that the wireless laser displacement sensor can ensure the endurance when monitoring, and is not limited by the connecting line.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] By arranging the first slide rail and the second slide rail on the two bridge span structures respectively, arranging the movable and telescopic shell on the first slide rail and the second slide rail, arranging the second feedback frame on the inner shell of the shell, and arranging the wireless laser displacement sensor for distance monitoring in the outer shell of the shell, the shell can change with the change of the distance of the bridge joint, and the distance between the second feedback frame and the wireless laser displacement sensor also changes synchronously with the telescoping of the outer shell and the inner shell, so that the wireless laser displacement sensor can judge the lateral offset distance change of the bridge joint through the position change of the second feedback frame. In this way, not only can the bridge joint be monitored for lateral offset, but also the movable characteristic allows it to monitor the offset distance of multiple points of the entire bridge joint. Compared with arranging the displacement sensor at a specific position, more monitoring points and more measurement data can be obtained to ensure higher measurement accuracy. By arranging the wireless laser displacement sensor in the shell, the wireless laser displacement sensor can be protected from external environmental interference such as dust and light, thereby ensuring measurement accuracy.

[0018] By arranging the first distance measuring block, the abutting wheel, the first feedback frame that can move in cooperation with the second feedback frame in the inner shell of the shell, and the abutting frame and the determination frame arranged on the first slide rail and the second slide rail, the monitoring device can not only obtain more monitoring data, but also measure the longitudinal offset distance of the bridge joint according to the contact between the first distance measuring block and the determination frame. In order to allow the wireless laser displacement sensor to classify and determine the monitoring data, the first feedback frame and the second feedback frame are made of two different materials, and the first feedback frame and the second feedback frame can automatically switch displacement, so that one wireless laser displacement sensor can realize two kinds of data monitoring.

[0019] By arranging the second distance measuring block in the inner shell that can drive and cooperate with the first distance measuring block, the monitoring device can also measure the longitudinal offset data of the bridge joint when it returns to the initial position, and the monitoring data can be more accurate through two measurements.

[0020] In order to avoid the situation that the second feedback frame cannot move away from the front of the wireless laser displacement sensor due to the too small longitudinal offset distance, the bidirectional telescopic frame is arranged as a lever for moving the wireless laser displacement sensor of the first distance measuring block, so that the first distance measuring block can also drive the wireless laser displacement sensor to move reversely through the bidirectional telescopic frame when the second feedback frame is moved away, so that the two can be staggered, and the wireless laser displacement sensor can successfully irradiate on the first feedback frame. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole display diagram of the bridge joint offset distance monitoring device.

[0022] Figure 2 It is a first split display diagram of the bridge joint offset distance monitoring device.

[0023] Figure 3 It is a shell cut display diagram of the bridge joint offset distance monitoring device.

[0024] Figure 4 It is a top planar section display diagram of the bridge joint offset distance monitoring device.

[0025] Figure 5 It is a second split display diagram of the bridge joint offset distance monitoring device.

[0026] Figure 6 It is a single display diagram of the distance measuring feedback assembly.

[0027] Figure 7 It is a split section display diagram of the distance measuring feedback assembly.

[0028] Figure 8 It is a layout diagram of the bridge joint offset distance monitoring device.

[0029] Figure 9 It is a form change diagram of the monitoring device in different monitoring positions and monitoring states.

[0030] Main symbol explanation:

[0031] 1, first slide rail; 2, abutment frame; 3, wireless terminal; 4, second slide rail; 5, determination frame; 6, outer shell; 7, inner shell; 8, battery; 9, first pulley set; 10, second pulley set; 11, motor; 12, first distance measuring block; 13, abutment wheel; 14, first feedback frame; 15, inclined surface; 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

[0032] The application will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Please combine Figures 1 to 9 The bridge joint offset distance monitoring device comprises a first slide rail 1 and a second slide rail 4 arranged below two adjacent bridge span structures respectively, two abutments 2 are arranged at the two ends of the first slide rail 1, a determination abutment 5 is arranged at the two ends of the second slide rail 4, the first slide rail 1 and the second slide rail 4 are not fixed in form and can be adjusted adaptively according to the positions installed on the bridge span structures, a wireless terminal 3 with a power socket is fixedly installed on any one abutment 2 of the first slide rail 1, a battery 8 with a plug is arranged at the bottom of a shell 6, so that the wireless laser displacement sensor 20 can ensure the endurance during monitoring and is not limited by the connecting line.

[0034] A movable shell is installed on the first slide rail 1 and the second slide rail 4, the shell is composed of the shell 6 and an inner shell 7 telescopically connected with the shell 6, two positioning rods are fixedly installed on the inner wall of the shell 6, one end of each of the two positioning rods extends into the inner shell 7 and is in sliding connection with the inner shell 7, a first spring is sleeved on each of the two positioning rods, the two ends of the first spring are respectively in abutment with the inner wall of the shell 6 and one side of the inner shell 7, so that the counter thrust formed thereby can make the shell 6 and the inner shell 7 better adapt to and synchronize with the distance change of the two adjacent bridge span structures, the wireless laser displacement sensor 20 for measuring the offset distance is arranged in the shell 6, and a distance measuring feedback assembly is arranged in the inner shell 7.

[0035] The wireless laser displacement sensor 20 can ensure that the sensor is not restricted by the connecting line, and a sensor with a connecting line can also be selected.

[0036] Through the above technical solution, the shell can change along with the distance change of the bridge joint, and the distance between the second feedback abutment 16 and the wireless laser displacement sensor 20 changes synchronously along with the telescopic change of the shell 6 and the inner shell 7, so that the wireless laser displacement sensor 20 can judge the transverse offset distance change of the bridge joint through the position change of the second feedback abutment 16, thereby not only the transverse offset of the bridge joint can be monitored, but also the movable characteristic makes it possible to monitor the offset distance of multiple points of the entire bridge joint, compared with the displacement sensor arranged at a specific position, the monitoring points are more, the measurement data that can be obtained are more, so that the measurement accuracy can be higher, and the wireless laser displacement sensor 20 arranged in the shell makes the wireless laser displacement sensor 20 not be disturbed by external environment such as dust and light, so as to ensure the measurement accuracy.

[0037] The distance measuring feedback assembly comprises a first feedback frame 14 which is telescopic and resettable and is provided with a 45-degree angle inclined surface 15, a second feedback frame 16 which is opposite to the wireless laser displacement sensor 20 and is different in material from the first feedback frame 14 is slidably installed on the first feedback frame 14, a sliding groove is arranged above the first feedback frame 14, and a sliding block extending into the sliding groove is arranged on the second feedback frame 16, so that the second feedback frame 16 can not only move forward together with the first feedback frame 14, but also can move horizontally together with the first distance measuring block 12, so that the wireless laser displacement sensor 20 can distinguish and process the laser signals fed back by different materials, so as to measure the horizontal offset distance and the vertical offset distance of the bridge joint together. The first distance measuring block 12 is arranged in the inner shell 7 and is telescopic and resettable, the second feedback frame 16 is connected with the first distance measuring block 12 in a telescopic manner, a connecting frame is telescopically installed on the second feedback frame 16, and the connecting frame is fixedly connected with the first distance measuring block 12, so that the first distance measuring block 12 can not only move the second feedback frame 16 to enable the laser signal on the wireless laser displacement sensor 20 to irradiate on the first feedback frame 14, but also can smoothly push the first feedback frame 14 to move forward at equal intervals through the abutting wheel 13. The abutting wheel 13 is arranged on the first distance measuring block 12 and is used to push the first feedback frame 14 to move, the abutting wheel 13 is in contact with the inclined surface 15 on the first feedback frame 14, one end of the first distance measuring block 12 is provided with a groove, a first gear rack is arranged on the inner wall of the top of the groove, the positioning frame 17 is fixedly installed on the inner shell 7, one end of the positioning frame 17 extends into the groove and is connected with the groove in a sliding manner, the second distance measuring block 18 is slidably installed in the positioning frame 17, the top of the second distance measuring block 18 is provided with a second gear rack, and the transmission gear 19 is rotatably installed in the positioning frame 17 and is engaged with the first gear rack and the second gear rack at the same time, so as to enable the second distance measuring block 18 to realize the secondary vertical offset distance measurement of the bridge joint.

[0038] Through the above technical scheme, the monitoring device moving monitoring method can not only obtain more monitoring data, but also can measure the vertical offset distance of the bridge joint according to the contact between the first distance measuring block 12 and the judging frame 5. In order to enable the wireless laser displacement sensor 20 to classify and determine the monitoring data, the first feedback frame 14 and the second feedback frame 16 are arranged to be two different materials, and the displacement switching between the first feedback frame 14 and the second feedback frame 16 can be automatically realized, so that one wireless laser displacement sensor 20 can realize two kinds of data monitoring.

[0039] Further, since the slope 15 on the first feedback frame 14 is at an angle of 45 degrees, the slope 15 is regarded as a diagonal line of a square, when an object moves from one end of the diagonal line to the other end, the actual lateral movement distance and the longitudinal movement distance of the object are equal, in this way, how much distance the first distance measuring block 12 moves along the X axis, then how much distance the first feedback frame 14 moves along the Y axis.

[0040] 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 distance of the bridge joint through the first feedback frame 14. When monitoring the lateral offset distance of the bridge joint, the distance between the second feedback frame 16 and the wireless laser displacement sensor 20 is mainly controlled by the telescopic distance between the outer shell 6 and the inner shell 7, and the telescopic distance between the outer shell 6 and the inner shell 7 is controlled by the first sliding rail 1 and the second sliding rail 4 fixedly connected with the bridge span structure, and the distance between the first sliding rail 1 and the second sliding rail 4 is determined by the distance between the two bridge span structures.

[0041] One side of the outer shell 6 is fixedly provided with a first pulley block 9, and the first pulley block 9 is located in the first sliding rail 1. The outer shell 6 is fixedly provided with a motor 11 for driving the first pulley block 9, so that the monitoring device can monitor the offset distance of the bridge joint at multiple points by moving periodically. The inner shell 7 is hingedly provided with a second pulley block 10, and the second pulley block 10 is located in the second sliding rail 4, so that the monitoring device can adapt to the angle change after the offset of the two bridge span structures.

[0042] The inner shell 7 is provided with two anti-push reset mechanisms on both sides, and each anti-push reset mechanism comprises a fixed plate, a sliding rod fixedly installed on the fixed plate, and a second spring sleeved on the sliding rod. Both sliding rods penetrate through the first feedback frame 14 and are in sliding connection with the first feedback frame 14. One end of each second spring abuts against the first feedback frame 14, so that the first feedback frame 14 can be reset after being extruded and moved. The first feedback frame 14 and the second feedback frame 16 are reset by the anti-push reset mechanism, the first distance measuring block 12 is reset by the reverse pushing force applied by the first feedback frame 14 after being reset, and the second distance measuring block 18 is reset synchronously by the transmission between the first distance measuring block 12 and the second distance measuring block 18.

[0043] The fixed frame 22 is movably arranged inside the shell 6, and the wireless laser displacement sensor 20 is fixedly connected with the fixed frame 22. The double-direction telescopic frame 21 is rotatably arranged on the inner wall of the bottom of the inner shell 7, and is composed of a middle sleeve and two telescopic strips slidingly arranged in the sleeve. The two telescopic strips at the two ends of the double-direction telescopic frame 21 are rotatably connected with the first distance measuring block 12 and the bottom of the fixed frame 22 respectively, so that when the first distance measuring block 12 drives the second feedback frame 16 to move, the fixed frame 22 and the wireless laser displacement sensor 20 can also be driven by the double-direction telescopic frame 21 to move in the opposite direction, so as to ensure that when the displacement distance of the first distance measuring block 12 is small, the laser signal of the wireless laser displacement sensor 20 can also be successfully irradiated on the first feedback frame 14, and the telescopic characteristic of the double-direction telescopic frame 21 can also adapt to the telescopic change of the shell 6 and the inner shell 7.

[0044] The implementation principle of the bridge joint offset distance monitoring device in the embodiment of the application is as follows:

[0045] When deployed, the first slide rail 1 and the second slide rail 4 can be deployed below the end of the two bridge span structures close to each other or installed at the end of the two bridge span structures close to each other according to actual needs. Generally, the end where the wireless terminal 3 is installed is the initial end, the monitoring device is usually at the initial end, and the plug on the bottom of the storage battery 8 is connected with the socket on the wireless terminal 3, so as to ensure continuous power supply and charging of the storage battery 8, and the wireless terminal 3 is in a fixed state and can be connected with the outside world by wire.

[0046] In addition, when deployed, the first slide rail 1 and the second slide rail 4 need to be kept stable and corresponding, and the abutment 2 and the determination frame 5 installed thereon also need to be kept corresponding, so that the distance between the first slide rail 1 and the second slide rail 4 is the determination standard for measuring the lateral offset distance of the bridge joint, and the two abutments 2 and the two determination frames 5 are the determination standard for measuring the longitudinal offset distance of the bridge joint.

[0047] A specific monitoring interval is set for the monitoring device, and it is usually recommended to monitor once every 24 hours. When monitoring, the first pulley set 9 is driven by the motor 11 to move, and the monitoring device is driven to move, so that the monitoring device moves from one end of the bridge joint to the other end and returns. In this process, the shell 6 and the inner shell 7 judge the lateral offset distance of the bridge joint according to the width of the bridge joint (the distance between the two bridge span structures).

[0048] When the outer shell 6 of the monitoring device abuts against the abutment 2 away from the wireless terminal 3, the first distance block 12 on the inner shell 7 also abuts against the determination abutment 5, at this time, the first distance block 12 drives the inclined surface 15 of the first feedback abutment 14 to move by a same distance towards the outer shell 6 while being retracted, and at the same time, the second feedback abutment 16 is moved forward along with the first feedback abutment 14, and the first distance block 12 also drives the second feedback abutment 16 to move by translation through the connecting abutment, so that the second feedback abutment 16 is moved away, and the wireless laser displacement sensor 20 can directly irradiate the first feedback abutment 14, and the first feedback abutment 14 is made of different material from the first feedback abutment 14, so that the wireless laser displacement sensor 20 distinguishes and processes the laser signals fed back by the different material objects, and switches to monitor the longitudinal offset of the bridge joint seam, and once the longitudinal offset of the two bridge span structures occurs, the moving distance of the first distance block 12 after abutting against the determination abutment 5 changes, if the moving distance of the first distance block 12 is 1cm under normal circumstances, once the first slide rail 1 or the second slide rail 4 follows the corresponding bridge span structure to occur longitudinal offset, the moving distance of the first distance block 12 will be greater than or less than 1cm, and in order to ensure the accuracy of the measurement data, the monitoring device is returned to the initial position, and the second distance block 18 is extruded by the initial position determination abutment 5, and drives the first distance block 12 to push the first feedback abutment 14 again through the transmission gear 19, so as to realize secondary measurement.

[0049] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application, and any non-essential changes and replacements made by those skilled in the art on the basis of the present application are within the protection scope of the present application.

Claims

1. A bridge joint offset distance monitoring device, characterized in that: include: A first slide rail (1) and a second slide rail (4) are respectively arranged under two adjacent bridge span structures, two support frames (2) are provided at both ends of the first slide rail (1), and a determination frame (5) is provided 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 includes a first feedback frame (14) that is retractable and resettable and is provided with a 45-degree angled bevel (15); a second feedback frame (16) is slidably mounted on the first feedback frame (14) and is positioned relative 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 both lateral offset distance measurement and longitudinal offset distance measurement of the connection seam; A telescopically repositionable first distance measuring block (12) is provided in the inner shell (7), the second feedback frame (16) is telescopically connected to the first distance measuring block (12), and 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) is in contact with the 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 spacing 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) being 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 set (10) is hingedly mounted on one side of the inner shell (7), and the second pulley set (10) is located in the second slide rail (4), so that the monitoring equipment 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 positioning rod 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 abutting 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 mechanism includes a fixed plate, a slide rod fixedly installed on the fixed plate, and a second spring slidably sleeved on the slide rod. The two slide rods both pass through the first feedback frame (14) and are slidably connected to the first feedback frame (14). One end of the two second springs is 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: 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 is rotatably installed 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 also can smoothly push the first feedback frame (14) forward equidistantly through the wheel (13).

8. The bridge joint offset distance monitoring device according to claim 1, characterized in that: A parallel-movable fixing frame (22) is provided inside the outer shell (6), and 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), and 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), thereby ensuring 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 supports (2) on the first slide rail (1), and a battery (8) with a plug is provided 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.

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