Bridge swivel construction height difference measuring device

Abstract

The invention belongs to the technical field of measuring equipment, and particularly relates to a bridge swivel construction height difference measuring device, which comprises a lower turntable, an upper turntable, a PLC (Programmable Logic Controller), a measuring assembly, a dust cleaning assembly and a change position real-time confirmation assembly, the measuring assembly is arranged on the outer sides of the lower turntable and the upper turntable, and measures the height difference change of the upper turntable relative to multiple positions of the lower turntable along with the synchronous rotation of the upper turntable relative to the lower turntable; the ash removal assembly is arranged on one side of the moving end of the measuring assembly. By amplifying height difference displacement through mechanical transmission and combining laser ranging conversion, tiny inclination and millimeter-level fine adjustment of a beam body can be accurately captured, posture misjudgment caused by insufficient resolution is avoided, meanwhile, the built-in laser range finder reduces environmental interference, dust and impurities of the semicircular leveling plate can be automatically cleaned when the detection sliding block moves so as to guarantee the measurement precision, and the measurement precision is improved. And the height difference deviation direction can be quickly positioned, the problem positioning time is greatly shortened, field treatment is efficiently guided, and blind operation is avoided.

Description

Technical Field

[0001] This invention belongs to the field of measurement equipment technology, and in particular relates to a bridge rotation construction elevation measurement device. Background Technology

[0002] Bridge rotation construction has been widely used in the construction of long-span bridges due to its advantages such as crossing existing traffic lines, strong adaptability to terrain, and high construction efficiency. The accurate measurement and real-time monitoring of the beam height difference during the rotation process is the core link to ensure the stability of the rotation posture, avoid the overturning and imbalance of the beam, and ensure that the closing accuracy meets the standards. It is directly related to the safety and quality of the rotation construction.

[0003] Currently, bridge rotation construction elevation difference measurements are mostly performed manually using traditional levels and total stations. This method relies on manual reading and aiming, making it susceptible to human error and line-of-sight deviations. Measurement errors are typically above the millimeter level, which is insufficient to meet the high-precision measurement requirements of the millimeter level during the rotation and closure phase. Furthermore, traditional instruments cannot eliminate systematic errors caused by temperature changes and beam vibrations at the construction site, resulting in insufficient measurement stability. Moreover, traditional measuring equipment can only perform static detection; during the rotation process, construction must be repeatedly paused, and manual equipment must be moved for measurement. This not only interrupts the rotation process and prolongs the overall construction period but also fails to continuously capture the dynamic elevation difference changes of the beam, making it difficult to monitor the rotation posture in real time.

[0004] Furthermore, during the rotation process, the beam rotates continuously at a speed of 0.01-0.02 rad / min. Traditional static measurement equipment cannot follow the beam's movement in real time, which easily leads to problems such as measurement interruption and data lag, and cannot provide timely data support for rotation control. In the open-air construction environment, factors such as wind load, rain, and dust have significant interference. Wind-induced beam vibration, temperature-induced beam expansion and contraction causing elevation drift, and dust and rain obstructing the measurement optical path all significantly reduce measurement accuracy. Moreover, existing sensors are mostly directly exposed to the external environment, making them more susceptible to environmental factors. At the same time, the continuous vibration generated by the operation of the rotation traction equipment and the friction between the beam and the slide rail directly leads to sensor data jitter and distortion. In addition, the instantaneous deflection fluctuation caused by the dynamic changes in the beam load distribution during the rotation process further aggravates the interference of elevation difference measurement. Existing technologies cannot balance measurement accuracy, real-time performance, and anti-interference, and cannot meet the complex working conditions of bridge rotation construction. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a device for measuring the height difference during bridge rotation construction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a bridge rotation construction elevation difference measuring device, including a lower turntable, an upper turntable and a PLC controller, and further including a measuring component, a dust removal component and a real-time position change confirmation component; The measuring component is located on the outside of the lower and upper turntables. As the upper turntable rotates synchronously with respect to the lower turntable, it measures the changes in the height difference between multiple positions of the upper turntable relative to the lower turntable. The dust removal component is installed on one side of the moving end of the measuring component and is used to perform dust removal on the front side in the direction of movement. The real-time position change confirmation component is electrically connected to the measurement component, and provides an intuitive display and reminder of the location of the elevation shift based on the elevation change signal fed back by the measurement component.

[0007] In the aforementioned bridge rotation construction elevation measurement device, the measurement component includes two semi-circular adjusting plates. Multiple leveling columns are fixedly connected to the lower ends of the two semi-circular adjusting plates. Multiple equidistantly distributed fixing seats are detachably fixed to the outer wall of the upper turntable. The lower side of the fixing seats away from the upper turntable is fixedly connected to the same transmission housing via multiple connecting rods. A transmission rack is movably sleeved on the lower end of the transmission housing. The lower end of the transmission rack passes through the lower end of the transmission housing and is fixedly connected to a detection slider. The detection slider abuts against the upper surface of the semi-circular adjusting plates. On one side of the transmission housing, an acceleration gearbox is fixedly connected. The input end of the acceleration gearbox is fixedly connected to a transmission gear located inside the transmission housing. The transmission gear and the transmission rack are meshed together. A measuring housing is also fixedly connected to the outside of the transmission housing via an L-shaped support rod. A synchronizing screw is rotatably connected to the inner wall of the measuring housing. One end of the synchronizing screw passes through the outside of the measuring housing and is fixedly connected to the output end of the acceleration gearbox. A moving plate is threaded onto the wall of the synchronizing screw. A laser rangefinder is fixedly arranged opposite to the moving plate on one side of the inner wall of the measuring housing.

[0008] In the above-mentioned bridge rotation construction elevation measurement device, the inner wall of the transmission housing is symmetrically and fixedly connected with multiple vertically arranged guide slide rods, the upper end of the transmission rack is fixedly connected with a limit plate, the limit plate is slidably sleeved with multiple guide slide rods, and the upper end of the limit plate and the top of the inner wall of the transmission housing are fixedly connected with multiple springs sleeved on the guide slide rods.

[0009] In the above-mentioned bridge rotation construction elevation measurement device, one end of the moving plate is fixedly connected to a limiting slider, and the inner wall of the measuring shell is provided with a limiting groove that matches and slides with the limiting slider.

[0010] In the above-mentioned bridge rotation construction elevation difference measuring device, the inner side of the semi-circular adjustment plate is also fixed with a plurality of positioning seats that are arranged opposite to the fixed seat. The surface of the positioning seat is provided with a first insertion hole, and a positioning rod is movably sleeved in the corresponding first insertion hole. The surface of the fixed seat is provided with a second insertion hole that is sleeved with the positioning rod. The top end of the positioning rod is provided with a round head structure.

[0011] In the aforementioned bridge rotation construction elevation difference measuring device, the dust removal component includes an L-shaped extension plate fixed to the side wall of the fixed base. The lower end of the L-shaped extension plate is fixedly connected to a cleaning pipe. The lower end of the cleaning pipe is uniformly connected to multiple cleaning heads. The cleaning heads are inclined relative to the cleaning pipe, and the inclination direction is the front side of the detection slider movement direction. The side wall of the fixed base is also fixed with a cleaning blower. The air outlet of the cleaning blower is connected to the upper end of the cleaning pipe through an air supply pipe.

[0012] In the above-mentioned bridge rotation construction elevation difference measurement device, the real-time position change confirmation component includes a mounting base, a servo reduction motor is fixed at the upper center of the mounting base, a circular plate is fixedly connected to the output end of the servo reduction motor, and multiple equidistant placement plates are integrally connected to the outer side of the circular plate. The multiple placement plates are arranged in a position corresponding to the multiple detection sliders, and a warning light stick is fixed on the placement plate.

[0013] In the above-mentioned bridge rotation construction elevation difference measuring device, a signal receiver is fixed on the mounting base. The signal receiver controls the servo reduction motor to synchronously drive the circular plate to rotate by the corresponding angle based on the rotation angle of the upper turntable relative to the lower turntable, and receives the warning signal fed back by the measuring component to control the corresponding warning light bar to light up. A nameplate located on one side of the warning light bar is also fixed on the placement plate.

[0014] Compared with existing technologies, the advantages of this invention are as follows: 1. By setting up a lower turntable, an upper turntable, and a measuring component, the height difference displacement during bridge rotation construction is effectively amplified through mechanical transmission. The amplified displacement is then measured by laser ranging, and the original height difference is calculated proportionally. This allows for precise capture of the slight tilt of the beam in the early stage of rotation and millimeter-level height difference fine-tuning before closure, avoiding attitude misjudgment caused by insufficient resolution. Furthermore, the laser ranging instrument is enclosed internally, reducing the impact of environmental factors on the accuracy of laser ranging.

[0015] 2. The cleaning component can clean the semi-circular adjustment plate in the direction of the moving slider, thus preventing dust and impurities accumulated on the semi-circular adjustment plate from affecting the accuracy of elevation difference measurement.

[0016] 3. By setting the real-time position change confirmation component, the specific location of the elevation difference deviation during bridge rotation construction can be quickly identified and located, greatly shortening the positioning time and enabling more efficient corresponding adjustment actions. After confirming the deviation location, it can directly guide the on-site handling actions and avoid blind operation. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the installation state of the measuring component of the present invention; Figure 2 This is a three-dimensional structural diagram of the real-time position change confirmation component of the present invention; Figure 3 This is a front-view stereoscopic structural diagram of the measuring component of the present invention; Figure 4 This is a rear-view stereoscopic structural diagram of the measuring component of the present invention; Figure 5 This is a frontal cross-sectional view of the measuring component of the present invention; Figure 6 This is a three-dimensional structural diagram of the installation of the fixed seat, positioning seat and positioning rod in the measuring component of the present invention; Figure 7 This is a three-dimensional structural diagram of the dust removal component of the present invention.

[0018] In the diagram: 1 Lower turntable, 2 Upper turntable, 3 Measuring component, 31 Semi-circular adjusting plate, 32 Leveling column, 33 Fixed base, 34 Connecting rod, 35 Transmission housing, 36 Transmission rack, 37 Detection slider, 38 Acceleration gearbox, 39 Transmission gear, 310 L-shaped support rod, 311 Measuring housing, 312 Synchronous screw, 313 Moving plate, 314 Laser rangefinder, 315 Guide slide rod, 316 Limiting plate, 317 Spring, 318 Positioning seat, 319 Socket one, 320 Positioning rod, 321 Socket two, 4 Dust removal component, 41 L-shaped extension plate, 42 Cleaning pipe, 43 Cleaning head, 44 Cleaning blower, 45 Air supply pipe, 5 Real-time position change confirmation component, 51 Mounting base, 52 Servo geared motor, 53 Round plate, 54 Placement plate, 55 Warning light bar, 56 Signal receiver, 57 Nameplate. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] like Figures 1-7 As shown, a bridge rotation construction elevation measurement device includes a lower turntable 1, an upper turntable 2 and a PLC controller, as well as a measurement component 3, a dust removal component 4 and a real-time position change confirmation component 5; The measuring component 3 is set on the outside of the lower turntable 1 and the upper turntable 2. As the upper turntable 2 rotates synchronously relative to the lower turntable 1, it measures the changes in the height difference of the upper turntable 2 relative to the lower turntable 1 at multiple positions. The measuring component 3 includes two semi-circular adjusting plates 31. Multiple leveling columns 32 are fixedly connected to the lower ends of the two semi-circular adjusting plates 31. Multiple equidistantly distributed fixing seats 33 are detachably fixed to the outer wall of the upper turntable 2. The lower side of the fixing seat 33 away from the upper turntable 2 is fixedly connected to the same transmission housing 35 via multiple connecting rods 34. A transmission rack 36 is movably sleeved on the lower end of the transmission housing 35. The lower end of the transmission rack 36 passes through the lower end of the transmission housing 35 and is fixedly connected to a detection slider 37. The detection slider 37 abuts against the upper side of the semi-circular adjusting plates 31. An acceleration gearbox 3 is fixed to one side of the transmission housing 35. 8. The input end of the acceleration gearbox 38 is fixedly connected to a transmission gear 39 located inside the transmission housing 35. The transmission gear 39 and the transmission rack 36 are meshed together. The outer side of the transmission housing 35 is also fixedly connected to a measuring housing 311 via an L-shaped support rod 310. The inner wall of the measuring housing 311 is rotatably connected to a synchronizing screw 312. One end of the synchronizing screw 312 passes through the outside of the measuring housing 311 and is fixedly connected to the output end of the acceleration gearbox 38. The rod wall of the synchronizing screw 312 is threaded with a moving plate 313. A laser rangefinder 314 is fixed on one side of the inner wall of the measuring housing 311 and is positioned opposite to the moving plate 313.

[0021] The inner wall of the transmission housing 35 is symmetrically and fixedly connected with multiple vertically arranged guide slide rods 315. The upper end of the transmission rack 36 is fixedly connected with a limiting plate 316. The limiting plate 316 is slidably sleeved with the multiple guide slide rods 315. The upper end of the limiting plate 316 and the top of the inner wall of the transmission housing 35 are fixedly connected with multiple springs 317 sleeved on the guide slide rods 315.

[0022] One end of the movable plate 313 is fixedly connected to a limit slider, and the inner wall of the measuring shell 311 is provided with a limit groove that matches and slides with the limit slider.

[0023] The inner side of the semi-circular adjusting plate 31 is also fixed with a plurality of positioning seats 318 that are opposite to the fixed seat 33. The surface of the positioning seat 318 is provided with a first insertion hole 319, and a positioning rod 320 is movably sleeved in the corresponding insertion hole 319. The surface of the fixed seat 33 is provided with a second insertion hole 321 that is sleeved with the positioning rod 320. The top end of the positioning rod 320 is provided with a round head structure.

[0024] The dust removal component 4 is installed on one side of the moving end of the measuring component 3 and is used to perform dust removal on the front side in the moving direction. The dust removal assembly 4 includes an L-shaped extension plate 41 fixed to the side wall of the fixed base 33. The lower end of the L-shaped extension plate 41 is fixedly connected to a cleaning pipe 42. The lower end of the cleaning pipe 42 is evenly connected to multiple cleaning heads 43. The cleaning heads 43 are inclined relative to the cleaning pipe 42, and the inclination direction is the front side of the movement direction of the detection slider 37. The side wall of the fixed base 33 is also fixed with a cleaning blower 44. The air outlet of the cleaning blower 44 is connected to the upper end of the cleaning pipe 42 through an air supply pipe 45.

[0025] The real-time position change confirmation component 5 is electrically connected to the measurement component 3. Based on the elevation difference change signal fed back by the measurement component 3, the orientation of the elevation difference shift is displayed and reminded intuitively.

[0026] The real-time position change confirmation component 5 includes a mounting base 51. A servo reduction motor 52 is fixed at the upper center of the mounting base 51. A circular plate 53 is fixedly connected to the output end of the servo reduction motor 52. Multiple equidistant placement plates 54 are integrally connected to the outer side of the circular plate 53. The multiple placement plates 54 are positioned in correspondence with the multiple detection sliders 37. Warning light rods 55 are fixed on the placement plates 54.

[0027] A signal receiver 56 is fixed on the mounting base 51. The signal receiver 56 controls the servo reduction motor 52 to synchronously drive the circular plate 53 to rotate by the corresponding angle based on the rotation angle of the upper turntable 2 relative to the lower turntable 1, and receives the warning signal fed back by the measuring component 3 to control the corresponding warning light bar 55 to light up. A nameplate 57 located on one side of the warning light bar 55 is also fixed on the placement plate 54.

[0028] The operating principle of the present invention is described as follows: Two semi-circular adjusting plates 31 are set on the outside of the lower turntable 1 and fixed together, so that the two semi-circular adjusting plates 31 are assembled into a whole annular adjusting plate. The semi-circular adjusting plates 31 are fixed and leveled by adjusting column 32. First, the positioning rod 320 is inserted into the first insertion hole 319 of the positioning seat 318. Then, the second insertion hole 321 on the fixing seat 33 is inserted into the upper end of the positioning rod 320 to achieve accurate locking of the relative installation position of the detection slider 37. At this time, the fixing seat 33 abuts against the outside of the upper turntable 2 and is fixed to the outer wall of the upper turntable 2. The detection slider 37 abuts against the semi-circular adjusting plate 31, waiting for the formal measurement work. After the fixed seat 33 is installed, the positioning rod 320 is pulled out. During the bridge rotation construction, the upper turntable 2 will deflect relative to the lower turntable 1, thereby driving multiple detection sliders 37 to move on the semi-circular adjusting plate 31. When the relative height difference changes in various directions during the bridge rotation construction, the detection sliders 37 in the corresponding directions will move synchronously with the height difference shift of the upper turntable 2, thereby causing the detection sliders 37 to move relative to the transmission housing 35. The detection sliders 37 drive the transmission rack 36 to move relative to the transmission housing 35, thereby causing the transmission rack 36 and the transmission gear 39 to generate a relative transmission action. The transmission gear 39 synchronously drives the input end of the acceleration gearbox 38 to rotate. Through the transmission connection of the acceleration gearbox 38, the synchronous screw 312 is driven to rotate synchronously. Through the threaded connection between the synchronous screw 312 and the moving plate 313, the moving plate 313 moves within the measuring housing 311. The laser rangefinder 314 monitors the relative position of the moving plate 313 in real time. The changes in elevation are then fed back to confirm the corresponding elevation changes. During bridge rotation construction, the elevation changes of the beam are often sub-millimeter displacements. When traditional laser rangefinders 314 directly measure these changes, the proportion of these small displacements in the laser range is extremely low, and they are easily masked by the equipment's own accuracy errors and reading jitter. Moreover, the resolution of ordinary laser rangefinders 314 is mostly ±1mm, which cannot identify critical elevation changes below 0.5mm. However, by accelerating the transmission ratio of the gearbox 38, the 1mm elevation displacement of the beam is amplified to a displacement of 10-20mm. The laser rangefinder 314 only needs to measure the amplified 10-20mm displacement and then convert it back to the original elevation difference proportionally. The equivalent measurement resolution can be improved by 10-20 times (ordinary laser rangefinders 314 can also achieve elevation difference detection accuracy of ±0.1mm). This can accurately capture the slight tilt of the beam in the early stage of rotation and the millimeter-level elevation difference fine adjustment before closing, avoiding attitude misjudgment due to insufficient resolution. Furthermore, the operation of the slewing traction equipment and the friction between the beam and the slide rail will generate continuous vibration, causing sensor data to fluctuate. The vibration is a high-frequency, small-amplitude instantaneous fluctuation, while the actual height difference change of the beam is a low-frequency, slowly changing displacement. Through the inertia of the mechanical gearbox and the transmission clearance within a controllable range, the high-frequency vibration signal can be attenuated, and only the actual structural height difference displacement is transmitted, which is equivalent to a "physical low-pass filter". The laser rangefinder 314 detects the amplified displacement after mechanical filtering, and there will be no data jump due to instantaneous vibration. Data smoothing can be achieved without complex software algorithms, which ensures real-time performance and avoids false alarms. During the detection process, as the detection slider 37 moves with the upper turntable 2, the PLC controller synchronously controls the cleaning blower 44 to work. The cleaning blower 44 supplies high-pressure air into the cleaning pipe 42 through the air supply pipe 45, and then sprays high-pressure airflow through multiple cleaning nozzles 43. This effectively blows away the dust and impurities accumulated on the semi-circular adjusting plate 31 in front of the detection slider 37 in the direction of movement, thus avoiding the slight displacement of the detection slider 37 caused by the accumulation of dust and impurities, which would affect the accuracy of the measurement results. During the bridge rotation construction, based on the rotational angular velocity of the upper turntable 2 relative to the lower turntable 1, the PLC controller sends an indication signal to the signal receiver 56, which in turn controls the servo reduction motor 52 to drive the circular plate 53 to rotate at the same angular velocity. Multiple warning light bars 55 on the placement plates 54 correspond to the installation positions of multiple detection sliders 37. The height difference signal fed back by the laser rangefinder 314 in the corresponding direction is fed back to the warning light bar 55 to provide different colors for warning. Specifically, when the height difference detected by the laser rangefinder 314 is ≤ 50% of the design allowable value, the warning light bar 55 in the corresponding direction is controlled to be constantly green, indicating that the bridge is rotating normally and no intervention is required; when the height difference is ≤ 50% of the design allowable value, the warning light bar 55 in the corresponding direction is controlled to be constantly green, indicating that the bridge is rotating normally and no intervention is required; when the height difference is ≤ 50% of the design allowable value, the warning light bar 55 in the corresponding direction is controlled to be constantly green, indicating that the bridge is rotating normally and no intervention is required. When the elevation difference is within 50% to 80% of the design allowable value, the warning light bar 55 in the corresponding position will flash yellow and a voice prompt will say "Elevation difference is too high, pay attention to monitoring". At this time, the rotation speed will be reduced and the trend of change will be continuously observed. When the elevation difference is within 80% to 100% of the design allowable value, the warning light bar 55 in the corresponding position will flash orange and a high-frequency buzzer will sound, and a voice prompt will say "Elevation difference exceeds the limit, stop rotation". When the detected elevation difference is greater than 100% of the design allowable value, the warning light bar 55 in the corresponding position will flash red and a loud alarm will sound. The system will forcibly cut off the traction power supply, and personnel will be evacuated to a safe area. The beam structure and hinges will be inspected, and work can only resume after expert evaluation. The system uses a laser rangefinder 314 to detect the rate of change of elevation difference. When the detected rate of change of elevation difference is ≤0.1mm / s, the device provides no feedback, indicating that the rotation is normal. When the detected rate of change of elevation difference is between 0.1 and 0.5mm / s, a yellow warning is issued, and a yellow light flashes, indicating "the attitude change is too rapid". When the detected rate of change of elevation difference is >0.5mm / s (sudden change), the device triggers a red warning, a loud alarm, and a forced shutdown, indicating a sudden risk (such as slide blockage or beam cracking), and the machine is immediately stopped for inspection.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bridge rotation construction elevation difference measuring device, comprising a lower turntable (1), an upper turntable (2), and a PLC controller, characterized in that, It also includes a measurement component (3), a dust removal component (4), and a real-time position change confirmation component (5); The measuring component (3) is set on the outside of the lower turntable (1) and the upper turntable (2). As the upper turntable (2) rotates synchronously relative to the lower turntable (1), the height difference of the upper turntable (2) relative to the lower turntable (1) at multiple positions is measured. The cleaning component (4) is installed on one side of the moving end of the measuring component (3) and is used to clean the front side in the moving direction. The real-time position change confirmation component (5) is electrically connected to the measurement component (3), and the position of the elevation difference shift is displayed intuitively based on the elevation difference change signal fed back by the measurement component (3).

2. The bridge rotation construction elevation measurement device according to claim 1, characterized in that, The measuring component (3) includes two semi-circular adjusting plates (31). Multiple leveling columns (32) are fixedly connected to the lower ends of the two semi-circular adjusting plates (31). Multiple equally spaced fixing seats (33) are detachably fixed to the outer wall of the upper turntable (2). The lower side of the fixing seat (33) away from the upper turntable (2) is fixedly connected to the same transmission housing (35) via multiple connecting rods (34). A transmission rack (36) is movably sleeved at the lower end of the transmission housing (35). The lower end of the transmission rack (36) penetrates the lower end of the transmission housing (35) and is fixedly connected to a detection slider (37). The detection slider (37) abuts against the upper side of the semi-circular adjusting plate (31). An acceleration gearbox is fixed to one side of the transmission housing (35). 38), the input end of the acceleration gearbox (38) is fixedly connected to a transmission gear (39) located in the transmission housing (35), the transmission gear (39) and the transmission rack (36) are meshed together, the outer side of the transmission housing (35) is also fixedly connected to a measuring housing (311) by an L-shaped support rod (310), the inner wall of the measuring housing (311) is rotatably connected to a synchronous screw (312), one end of the synchronous screw (312) passes through the outside of the measuring housing (311) and is fixedly connected to the output end of the acceleration gearbox (38), the rod wall of the synchronous screw (312) is threaded with a moving plate (313), and a laser rangefinder (314) is fixed on one side of the inner wall of the measuring housing (311) opposite to the moving plate (313).

3. The bridge rotation construction elevation difference measuring device according to claim 2, characterized in that, The inner wall of the transmission housing (35) is symmetrically and fixedly connected with multiple vertically arranged guide slide rods (315). The upper end of the transmission rack (36) is fixedly connected with a limiting plate (316). The limiting plate (316) is slidably sleeved with the multiple guide slide rods (315). The upper end of the limiting plate (316) and the top of the inner wall of the transmission housing (35) are fixedly connected with multiple springs (317) sleeved outside the guide slide rods (315).

4. The bridge rotation construction elevation measurement device according to claim 2, characterized in that, One end of the movable plate (313) is fixedly connected to a limiting slider, and the inner wall of the measuring shell (311) is provided with a limiting groove that matches and slides with the limiting slider.

5. The bridge rotation construction elevation difference measuring device according to claim 2, characterized in that, The inner side of the semi-circular adjusting plate (31) is also fixed with a plurality of positioning seats (318) that are opposite to the fixed seat (33). The surface of the positioning seat (318) is provided with a first insertion hole (319), and a positioning rod (320) is movably sleeved in the corresponding first insertion hole (319). The surface of the fixed seat (33) is provided with a second insertion hole (321) that is sleeved with the positioning rod (320). The top end of the positioning rod (320) is provided with a round head structure.

6. The bridge rotation construction elevation measurement device according to claim 2, characterized in that, The dust removal assembly (4) includes an L-shaped extension plate (41) fixed to the side wall of the fixed base (33). The lower end of the L-shaped extension plate (41) is fixedly connected to a cleaning pipe (42). The lower end of the cleaning pipe (42) is uniformly connected to multiple cleaning heads (43). The cleaning heads (43) are inclined relative to the cleaning pipe (42), and the inclination direction is the front side of the moving direction of the detection slider (37). The side wall of the fixed base (33) is also fixed with a cleaning blower (44). The air outlet of the cleaning blower (44) is connected to the upper end of the cleaning pipe (42) through an air supply pipe (45).

7. The bridge rotation construction elevation measurement device according to claim 2, characterized in that, The real-time position change confirmation component (5) includes a mounting base (51), a servo geared motor (52) is fixed at the upper center of the mounting base (51), a circular plate (53) is fixedly connected to the output end of the servo geared motor (52), and multiple equidistant placement plates (54) are integrally connected to the outer side of the circular plate (53). The multiple placement plates (54) are arranged in a position corresponding to the multiple detection sliders (37), and a warning light rod (55) is fixed on the placement plate (54).

8. The bridge rotation construction elevation difference measuring device according to claim 7, characterized in that, A signal receiver (56) is fixed on the mounting base (51). The signal receiver (56) controls the servo geared motor (52) to synchronously drive the circular plate (53) to rotate by the corresponding angle based on the rotation angle of the upper turntable (2) relative to the lower turntable (1). It also receives the warning signal fed back by the measuring component (3) to control the corresponding warning light bar (55) to light up. A nameplate (57) located on one side of the warning light bar (55) is also fixed on the placement plate (54).

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