Swivel bridge swivel construction monitoring system and construction method

Abstract

A swivel bridge swivel construction monitoring system, a digital weighing system is installed between the upper and lower bearing platforms, a beam body deflection monitoring system is installed at the center of the two ends of the beam body, a spatial posture measurement system is installed at the center and left and right sides of the two ends of the beam body, a rotating vertical shaft monitoring system is installed on the rotating shaft of the beam surface, a beam body axis positioning system is installed at the end of the beam body, the digital weighing system is used for balancing the weight of the beam body; the beam body deflection monitoring system is used for monitoring the deflection value of the beam body; the spatial posture measurement system is used for measuring the spatial posture, rotation angle and rotation angular velocity of the beam body during rotation; the rotating vertical shaft monitoring system is used for measuring the three-dimensional coordinates, horizontal position angle and rotation axis offset value of the rotating center during the rotation of the beam body; the beam body axis positioning system is used for guiding the positioning of the beam body axis and observing the transverse and longitudinal deviation values of the beam body after positioning. The design has stable monitoring, high monitoring precision.

Description

Technical Field

[0001] This invention relates to the field of bridge construction for rotating bridges, and more particularly to a monitoring system and construction method for the rotation construction of rotating bridges. Background Technology

[0002] Bridge rotation construction is a bridge construction technique developed in the 1940s. It is carried out at appropriate locations on both sides of rivers, roads, and canyons. By transforming work above obstacles into work on the shore or near the ground, a complete set of rotation equipment is used to rotate the bridge horizontally or vertically according to the design requirements to put the bridge into place. Bridges with horizontal rotation generally have continuous box girders. During the rotation, all the supports under the beam must be removed and suspended in the air. Therefore, the whole process needs to be monitored and controlled to prevent under-rotation or over-rotation, excessive beam deviation, or collapse. Existing monitoring methods for bridge rotation construction primarily rely on a total station and a standard circular prism to measure real-time attitude changes in the bridge beam. However, during the rotation, the prism rotates with the bridge, causing changes in both its horizontal and vertical orientation relative to the fixed total station. This necessitates continuous reverse rotation by personnel to align it with the total station for continuous observation. Due to the short rotation time and the large number of prisms that need to be rotated, the workload is substantial. Accidental contact with the prism support can also cause monitoring points to fail. Furthermore, the existing 360° miniature prisms have significant errors and blind spots. When the bridge tilts, the prism cannot automatically return to its vertical position, resulting in new observation errors. Therefore, the monitoring is significantly affected by environmental and human factors, leading to insufficient monitoring accuracy and low efficiency, and a limited amount of data collected within the same timeframe. Summary of the Invention

[0003] The purpose of this invention is to overcome the defects and problems of poor monitoring effect in the existing technology of rotating bridge construction, and to provide a rotating bridge construction monitoring system and construction method with good monitoring effect.

[0004] To achieve the above objectives, the technical solution of the present invention is:

[0005] A construction monitoring system for a rotating bridge includes a control system, a digital weighing system, a beam deflection monitoring system, a spatial attitude measurement system, a rotational vertical axis monitoring system, and a beam axis positioning system. The digital weighing system is installed between the upper and lower bearing platforms of the beam. The beam deflection monitoring system is installed at the junction of the web and bottom plate at both ends of the beam. The spatial attitude measurement system is installed at the center of the bridge deck at both ends of the beam and on the left and right sides. The rotational vertical axis monitoring system is installed on the rotational axis of the beam. The beam axis positioning system is installed on the longitudinal axis at the end of the beam.

[0006] The digital weighing system is used to balance and weigh the beam before rotation using hydraulic jacks, measure the vertical displacement distance of the beam during weighing, and send the data to the control system.

[0007] The beam deflection monitoring system is used to monitor the downward deflection value after the support at the bottom of the beam is removed and during the rotation process, and sends the data to the control system.

[0008] The spatial attitude measurement system is used to measure the changes in the spatial attitude of the beam, the rotation angle and the rotation angular velocity during the rotation process, and send the data to the control system.

[0009] The rotating vertical axis monitoring system is used to measure the three-dimensional coordinates and horizontal azimuth of the beam's rotation center and send the data to the control system.

[0010] The beam axis positioning system is used to assist in guiding the beam axis to be in place and to observe the transverse and longitudinal deviation values ​​of the beam after it is in place.

[0011] The control system is used to control the digital weighing system to guide the counterweight on the beam surface to maintain torque balance before the beam is rotated; after the support is removed, the beam deflection change curve is plotted based on the deflection value obtained by the beam deflection monitoring system, and the beam is rotated after the deflection value stabilizes; the rotation angle and rotation speed of the beam are controlled by the data obtained by the spatial attitude measurement system and the rotation vertical axis monitoring system to guide the beam into position; and the beam axis positioning system is used to assist in the positioning of the beam axis.

[0012] The digital weighing system includes multiple hydraulic jacks and displacement sensors. The multiple hydraulic jacks and displacement sensors are circumferentially distributed on the upper side of the lower support platform of the beam. The output ends of the multiple hydraulic jacks are connected to the upper support platform of the beam, and the output ends of the multiple displacement sensors are connected to the lower side of the upper support platform of the beam. The multiple hydraulic jacks and displacement sensors are all connected to the control system.

[0013] The control system is used to control the operation of the hydraulic jacks and to obtain the vertical displacement distance of the beam through displacement sensors.

[0014] The beam deflection monitoring system includes a multi-axis sensor, which is installed at the junction of the web and the bottom plate at both ends of the beam. The multi-axis sensor is used to monitor the beam's deflection, horizontal change, vibration, and rotational inertia, and sends the data to the control system.

[0015] Alternatively, the beam deflection monitoring system may include a 720-degree deformation monitoring prism. Angle steel brackets are installed at the junction of the left and right webs and the bottom plate at both ends of the beam. The upper side of the angle steel brackets is connected to the 720-degree deformation monitoring prism via connecting threads. The three-dimensional coordinate values ​​of the 720-degree deformation monitoring prism are measured by a total station and sent to the control system.

[0016] The spatial attitude measurement system includes multiple 720-degree deformation monitoring prisms. Angle steel brackets are installed at the junction of the left and right web plates and the bottom plate at both ends of the beam. The upper side of the angle steel brackets is connected to the 720-degree deformation monitoring prisms through connecting threads. The top of the left and right sides of both ends of the beam is connected to the 720-degree deformation monitoring prisms through pre-embedded bolts. The upper end face of both ends of the beam is connected to the 720-degree deformation monitoring prisms through pre-embedded bolts.

[0017] The 720-degree deformation monitoring prism includes a first top plate and a first bottom plate spaced apart vertically. A threaded hole is formed at the center of the first bottom plate. A leveling device for adjusting the parallelism of the two plates is provided between the first bottom plate and the first top plate. A mounting groove is formed on the lower side of the first top plate, and a first motor and a vertical shaft are installed within the mounting groove. The output end of the first motor is connected to a first pinion gear. The vertical shaft is located at the center of the first top plate. A first large gear is fitted onto the outer circumference of the lower end of the vertical shaft, meshing with the first pinion gear. The upper end of the vertical shaft passes through the first top plate. A U-shaped frame is connected to the rear. The inner bottom wall of the U-shaped frame is provided with a T-shaped horizontal bubble. A first horizontal axis is provided in both sides of the U-shaped frame. A first prism lens is connected between the two first horizontal axes. A power supply is embedded in one side of the U-shaped frame, and a second motor is provided in the other side. A second small gear is provided at the output end of the second motor. A second large gear is provided at the end of the first horizontal axis near the second motor. The second large gear is meshed with the second small gear. The first motor and the second motor are connected to the power supply. The axis of the vertical shaft intersects the axis of the first horizontal axis perpendicularly.

[0018] The control system is used to acquire the three-dimensional coordinate values ​​of multiple 720-degree deformation monitoring prisms through a total station, and to obtain the rotation angle and rotational angular velocity of the beam as well as the attitude change of the beam.

[0019] The upper side of the first top plate is provided with a receiving groove, and a connecting bearing is provided in the receiving groove. The outer ring of the connecting bearing is connected to the inner wall of the receiving groove, and the inner ring of the connecting bearing is sleeved on the outer circumferential surface of the vertical shaft. A connecting column is also provided in the receiving groove, and a connecting plate is connected to the upper side of the connecting column. The connecting plate is circular. Both the connecting plate and the connecting column are sleeved on the vertical shaft. The connecting plate is connected to the lower side of the U-shaped frame. A pointer is provided on the upper side of the connecting plate. A circular scale line is provided on the upper side of the first top plate. The center of the circular scale line is located on the central axis of the vertical shaft, and the pointer points to the circular scale line.

[0020] The rotating vertical axis monitoring system includes an omnidirectional adaptive prism, which is connected to the upper surface of the beam via a tripod. The omnidirectional adaptive prism includes a base, a mounting shaft, a control unit, a multi-axis sensor, an adjustment module, a display module, a horizontal rotation module, a vertical rotation module, a laser ranging module, a prism frame, and a second prism lens. The multi-axis sensor, adjustment module, display module, horizontal rotation module, vertical rotation module, and laser ranging module are connected to the control unit. The control unit, multi-axis sensor, adjustment module, display module, and horizontal rotation module are all mounted on the base. The mounting shaft is rotatably connected to the base via the horizontal rotation module. The laser ranging module is connected to the center of the lower end of the mounting shaft. The prism frame is connected to the upper end of the mounting shaft. The second prism lens is rotatably connected to the prism frame. The vertical rotation module is connected to the second prism lens. The multi-axis sensor is connected to the control system.

[0021] The control system is used to acquire the three-dimensional coordinates of the omnidirectional adaptive prism using a total station, measure the horizontal azimuth angle of the beam using a multi-axis sensor, and display the real-time rotation status of the beam and the horizontal offset value of the rotation axis.

[0022] The adjustment module includes a motor driver, two fifth motors, and two gear transmission mechanisms. The motor driver is connected to the control unit, and both fifth motors are connected to the motor driver. The output end of each fifth motor is connected to the input end of the gear transmission mechanism, and the output end of the gear transmission mechanism is connected to the lower end of the support rod. The horizontal rotation module includes a third motor, a third pinion, and a third large gear. The third motor is connected to the control unit and is located on the lower side of the top plate. The third pinion is connected to the output end of the third motor, and the third large gear... The wheel is located inside the through hole and meshes with the third small gear. The third large gear is sleeved on the outer circumferential surface of the mounting shaft at the lower end. The vertical rotation module includes a fourth motor, a driving gear, and a driven gear. The fourth motor is connected to the control unit. The fourth motor is connected to the outside of the prism frame, and its output end passes through the prism frame and is located on the inside of the prism frame. The driving gear is connected to the output end of the fourth motor. The driven gear meshes with the driving gear. The second prism lens is rotatably connected to the prism frame through the second horizontal shaft. The driven gear is sleeved on the second horizontal shaft.

[0023] The beam axis positioning system includes a plumb bob and an acrylic plate. The acrylic plate is connected to one end of the beam. A crosshair scale is set at the center of the acrylic plate, and the longitudinal axis of the crosshair scale coincides with the longitudinal axis of the beam. A tripod is connected to the lower side of the plumb bob, and the tripod is set on the ground. The plumb bob is arranged relative to the designed longitudinal axis of the beam. A north arrow and a bubble level are set on the upper side of the acrylic plate.

[0024] The beam axis positioning system is used to assist in positioning the beam axis and observe the lateral and longitudinal deviation values ​​after positioning using a plumb line and a cross coordinate scale.

[0025] A construction method for a construction monitoring system for a rotating bridge, the construction method comprising the following steps:

[0026] S1. Before rotation, the beam is lifted longitudinally and laterally using a digital weighing system. At the same time, the pressure value of the hydraulic oil pressure sensor and the displacement value of the displacement sensor are obtained. The frictional resistance torque of the upper bearing platform, the unbalanced torque of the beam, the static friction resistance coefficient of the ball joint, and the eccentricity of the rotating body are calculated. Then, the counterweight position is selected and the counterweight is calculated using the lever principle. The counterweight is applied according to the calculation results to make the structural center of gravity of the beam coincide with the center of rotation axis or keep the horizontal distance within the design value. At this time, the beam balance weighing is completed.

[0027] S2. Before rotation, scan the overall or end profile of the beam using a 3D laser scanner or laser profiler in conjunction with a total station; monitor the deflection curve of the beam using a beam deflection monitoring system, and rotate the beam after the values ​​stabilize.

[0028] S3. During the beam rotation process, the beam deflection monitoring system monitors the horizontal changes, vibrations, and rotational inertia of the beam in real time; the spatial attitude measurement system calculates the rotation angle and rotational angular velocity of the beam by measuring the three-dimensional coordinates of the beam during the rotation process; and the rotation vertical axis monitoring system continuously monitors the three-dimensional coordinates and horizontal azimuth of the beam rotation center in real time during the rotation process, displaying the horizontal offset value of the beam rotation axis and the real-time rotation status.

[0029] S4. When the beam is about to be rotated into place, the beam axis positioning system is used to assist in positioning the longitudinal axis of the beam and to observe the lateral and longitudinal deviation values ​​after positioning.

[0030] S5. After the rotation is completed, the overall or end section of the beam's outer contour is scanned by a 3D laser scanner or laser profiler in conjunction with a total station. The data from the two scans are compared to obtain the spatial offset value during the beam rotation process. Then, the beam is finely adjusted and reset by hydraulic jacks.

[0031] S6. After the rotation is completed, the construction of the side span cast-in-place section is carried out. The temporary constraints of the support are released, the bottom formwork is removed, and the support is subjected to force. The system conversion is carried out. After the beam system conversion, before the road construction, the creep monitoring of the beam is carried out through the spatial attitude measurement system to provide a reference for the next step of road construction.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] 1. In the construction monitoring system and method for rotating bridge of the present invention, before rotation, the bridge beam is weighed and counterweighted using a digital weighing system to prevent bridge deflection due to unbalanced torque during rotation; the beam deflection monitoring system measures the beam's downward deflection value to avoid instability caused by beam deformation after the removal of the bottom support, which would affect subsequent monitoring results; the spatial attitude measurement system measures the three-dimensional coordinates of the beam to obtain the attitude changes of the beam during rotation; since the vertical distance from the top of the beam to the apex of the rotating ball hinge is relatively long, a rotating vertical axis monitoring system is used to monitor the beam rotation. Real-time continuous monitoring of data such as the horizontal axis and horizontal azimuth angle facilitates timely measures to prevent excessive tilting of the rotation axis and beam displacement during the rotation process. To prevent under-rotation or over-rotation of the beam, the hydraulic braking system is activated promptly to overcome the beam's rotational inertia. A beam axis positioning system is installed to assist in positioning the beam's longitudinal axis as it approaches its final position. Simultaneously, the lateral and longitudinal deviation values ​​of the beam at positioning are read. Compared to existing technologies, employing multiple systems allows for real-time monitoring of the beam's spatial attitude during rotation from various angles, guiding precise beam positioning. Therefore, this invention offers stable monitoring and comprehensive coverage.

[0034] 2. In this invention, a bridge rotation construction monitoring system and method utilizes hydraulic jacks and displacement sensors to balance and weigh the bridge beam. After weighing the beam longitudinally and laterally, counterweights are applied to the bridge, aligning the bridge's center of gravity with the vertical axis of rotation. This overcomes the beam's deflection during rotation due to torque imbalance. Multiple 720-degree deformation monitoring prisms are installed, allowing for free rotation of either 360° horizontally or vertically as the beam rotates. This eliminates the need for manual prism rotation and facilitates easy alignment of the prisms with the total station, improving work efficiency and overcoming the low measurement accuracy and blind spots in vertical observation of currently used 360° prisms. By measuring the three-dimensional coordinates of the prism at the center of the beam's end, the rotation angle and angular velocity can be calculated using the rotation trajectory as a curve element. The 720-degree deformation monitoring prisms can measure changes in the beam's posture during rotation. Therefore, this invention offers high reliability and stable monitoring.

[0035] 3. In the construction monitoring system and method for a rotating bridge of the present invention, a first motor realizes the horizontal rotation of the U-shaped frame and the prism lens, and a second motor drives the first horizontal axis to rotate, thereby driving the vertical rotation of the first prism lens. This allows the first prism lens to rotate in both directions to align with the total station. A gear meshing method between a small gear and a large gear creates a speed reduction, enabling fine-tuning of the prism lens rotation. A circular connecting plate with a pointer is used, and a circular scale line is set on the upper side of the first top plate. By reading the scale value pointed to by the pointer, the current rotation angle of the U-shaped frame can be read, facilitating precise horizontal rotation fine-tuning of the U-shaped frame to align the first prism lens with the total station. The first prism lens and the total station work together to measure the three-dimensional coordinates of the beam during rotation, achieving high measurement accuracy and small error. Therefore, the present invention has a stable structure and high measurement accuracy.

[0036] 4. In the construction monitoring system and method for a rotating bridge of the present invention, an all-around adaptive prism is set up, and the three-dimensional coordinate measurement of the prism is carried out in conjunction with an automatic total station to monitor the motion state of the beam's rotation center. At the same time, the built-in multi-axis sensor sends data such as three-axis acceleration, three-axis angular velocity, three-axis angle, three-axis magnetic field, and quaternion. This can effectively avoid the problems of existing 360° prisms, which are composed of multiple small prisms arranged horizontally, resulting in high cost, blind spots and corrections, failure to automatically reset the prism once it tilts with the bridge, and the inability to adjust the instrument's vertical angle due to the bridge rotating prism. The laser ranging module can measure the vertical height between the prism center and the ground monitoring point. The multi-axis sensor sends the horizontal tilt angle and azimuth angle data to the control system. When the prism tilts, the control system sends a pulse signal to cause the adjustment module to level and reset the base. The horizontal rotation module controls the installation axis and the second prism to align horizontally with the total station. The invention employs a vertical rotation module to control the second prism lens for vertical alignment with the total station. During beam rotation, the electronic compass function of a multi-axis sensor automatically measures the horizontal azimuth angle. This angle is subtracted from the initial azimuth angle before rotation to obtain the beam's rotation angle. The control system automatically and synchronously rotates the prism in the opposite direction by the corresponding angle, ensuring the prism remains directly aligned with the total station and maintains its initial working state. This allows subsequent measurements to proceed normally. Compared to existing technologies, this fully automated operation replaces traditional manual operation, reducing workload. The adjustment, horizontal, and vertical rotation modules are all motor-driven. A multi-axis sensor, control unit, and motor driver automatically control the rotation of the fifth motor, which simultaneously raises and lowers the second top plate of the base, achieving precise leveling and self-locking. The third, fourth, and fifth motors all output power via gear transmission, facilitating fine-tuning and achieving high adjustment accuracy. Therefore, this invention offers stable rotation, high adjustment accuracy, and fully automated control.

[0037] 5. In the construction monitoring system and method for rotating bridge of the present invention, the points on the longitudinal axis of the beam end after the beam body is in place are marked on the ground using a total station. Then, a plumb line is set up at the ground points. At the same position corresponding to the beam end before rotation, an acrylic plate is horizontally placed on a steel bracket. A crosshair coordinate axis is set at the center of the acrylic plate. Three arc-shaped mounting holes on the acrylic plate are connected to the steel bracket through screws and nuts. The three arc-shaped mounting holes are concentric with the center of the crosshair coordinate axis, which facilitates the horizontal rotation and fine adjustment of the acrylic plate to make the longitudinal axis of the coordinate axis coincide with the longitudinal axis of the beam body. Concentric circles or grid auxiliary lines are set at equal intervals on the coordinate axis to facilitate the reading of the coordinate axis data. The center of the crosshair... The center of gravity should coincide with the theoretical position of the ground-based plumb line after the beam is rotated and positioned. As the beam is nearing its final position, the vertically projected cursor from the plumb line will appear on the plexiglass plate, guiding the beam to continue rotating until the cursor aligns with the longitudinal axis of the crosshairs. At this point, the beam is fully rotated and positioned. However, due to various reasons, perfect alignment may not be possible. Therefore, the lateral and longitudinal error values ​​at the time of beam positioning can be directly read from the concentric circles or grid lines of the crosshairs to guide the next step. This process eliminates the need for complex calculations and effectively prevents equipment malfunctions or calculation errors, such as those related to monitoring instruments, computer equipment, software programs, or communication interfaces, from causing inaccurate beam positioning. Therefore, this invention offers a stable monitoring process, simple and efficient methods, and high monitoring accuracy. Attached Figure Description

[0038] Figure 1 This is a structural schematic diagram of a rotating bridge construction monitoring system according to the present invention.

[0039] Figure 2 This is a schematic diagram of the beam structure in this invention.

[0040] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0041] Figure 4 yes Figure 2 Enlarged diagram of point B in the middle.

[0042] Figure 5 yes Figure 2 Enlarged diagram of point C in the middle.

[0043] Figure 6 This is a schematic diagram of the 720-degree deformation monitoring prism in this invention.

[0044] Figure 7 This is a schematic diagram of the structure of the U-shaped frame and the first prism lens in this invention.

[0045] Figure 8 This is a cross-sectional schematic diagram of the U-shaped frame and the first prism lens in this invention.

[0046] Figure 9 This is a cross-sectional schematic diagram of the first top plate in this invention.

[0047] Figure 10 This is a schematic diagram of the structure of the first top plate in this invention.

[0048] Figure 11 This is a schematic diagram of the structure of the first base plate in this invention.

[0049] Figure 12 This is a schematic diagram of the omnidirectional adaptive prism in this invention.

[0050] Figure 13 This is a schematic diagram of the base and mounting shaft in this invention.

[0051] Figure 14 This is a schematic diagram of the structure of the support rod, the fifth motor, and the gear transmission mechanism in this invention.

[0052] Figure 15 This is a top view of the second top plate in this invention.

[0053] Figure 16 This is a bottom view of the second top plate in this invention.

[0054] Figure 17 This is a schematic diagram of the structure of the prism frame, the second prism lens, and the vertical rotation module in this invention.

[0055] Figure 18 This is a structural schematic diagram of the vertical rotation module.

[0056] Figure 19 This is a schematic diagram of the structure of the plexiglass plate in Embodiment 5 of the present invention.

[0057] Figure 20 This is a schematic diagram of the structure of the plexiglass plate in Embodiment 8 of the present invention.

[0058] In the diagram: 720-degree deformation monitoring prism 1, first base plate 11, first top plate 12, leveling device 13, first motor 14, vertical shaft 15, first pinion 16, first gear 17, U-shaped frame 18, T-shaped horizontal bubble 19, first horizontal shaft 110, first prism lens 111, power supply 112, second motor 113, second pinion 114, second gear 115, threaded hole 116, mounting groove 117, receiving groove 118, connecting bearing 119, connecting column 120. Connecting plate; 121. Pointer; 122. Circular scale line; 123. Baffle; 124. Mounting cover; 125. Circuit board; 126. Solar panel bracket; 127. Solar panel; 128. First laser head; 129. Switch; 130. Spherical bearing; 131. Connecting screw; 132. Knurled nut; 133. Omnidirectional adaptive prism; 24. Mounting shaft; 21. Base; 22. Control unit; 23. Multi-axis sensor; 24. Adjustment module; 25. Display module; 26. Horizontal rotation module; 27. 28. Vertical rotation module; 29. ​​Laser ranging module; 210. Third motor; 211. Third pinion; 212. Third large gear; 213. Fourth motor; 214. Driving gear; 215. Driven gear; 216. Motor driver; 217. Fifth motor; 218. Gear transmission mechanism; 219. Prism frame; 220. Second prism lens; 221. Second laser head; 222. Second horizontal axis; 223. Buzzer; 224. Second base plate; 225. Second top plate; 226. Through hole; 227. Connecting hole. 227. Rod end joint bearing; 228. Support rod; 229. Adjusting nut; 230. Circular bubble level; 231. Display; 232. Mechanical compass; 233. Angle steel bracket; 3. Tripod; 4. Plumb line; 5. Acrylic glass plate; 6. Cross coordinate scale; 61. Compass; 7. Bubble level; 8. Beam; 9. Control system; 10. Digital weighing system; 20. Beam deflection monitoring system; 30. Spatial attitude measurement system; 40. Rotational vertical axis monitoring system; 50. Beam axis positioning system; 60. Detailed Implementation

[0059] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] Example 1:

[0061] See Figures 1 to 20A construction monitoring system for a rotating bridge includes a control system 10, a digital weighing system 20, a beam deflection monitoring system 30, a spatial attitude measurement system 40, a rotational vertical axis monitoring system 50, and a beam axis positioning system 60. The digital weighing system 20 is installed between the upper and lower abutments of the beam 9. The beam deflection monitoring system 30 is installed at the junction of the web and bottom plate at both ends of the beam 9. The spatial attitude measurement system 40 is installed at the center of the bridge deck at both ends of the beam 9 and on the left and right sides. The rotational vertical axis monitoring system 50 is installed on the rotation axis of the beam 9. The beam axis positioning system 60 is installed on the longitudinal axis at the end of the beam 9.

[0062] The digital weighing system 20 includes multiple hydraulic jacks and displacement sensors. The multiple hydraulic jacks and displacement sensors are circumferentially distributed on the upper side of the lower support of the beam 9. The output ends of the multiple hydraulic jacks are connected to the upper support of the beam 9, and the output ends of the multiple displacement sensors are connected to the lower side of the upper support of the beam 9. The multiple hydraulic jacks and displacement sensors are all connected to the control system 10.

[0063] The beam deflection monitoring system 30 includes a multi-axis sensor 24, which is installed at the junction of the web and the bottom plate at both ends of the beam 9.

[0064] A construction method for a construction monitoring system for a rotating bridge, the construction method comprising the following steps:

[0065] S1. The longitudinal and transverse directions of the beam 9 are lifted by the digital weighing system 20 before rotation. At the same time, the pressure value of the hydraulic oil pressure sensor and the displacement value of the displacement sensor are obtained. The frictional resistance torque of the ball joint of the upper bearing platform, the unbalanced torque of the beam 9, the static friction resistance coefficient of the ball joint and the eccentricity of the rotating body are calculated. Then, the counterweight position is selected and the counterweight is calculated using the lever principle. The counterweight is applied according to the calculation results so that the structural center of gravity of the beam 9 coincides with the center of rotation axis or the horizontal distance is kept within the design value. At this time, the balance weighing of the beam 9 is completed.

[0066] S2. Before rotation, scan the overall or end section of the outer contour of beam 9 using a 3D laser scanner or laser profiler in conjunction with a total station; monitor the deflection curve of beam 9 using the beam deflection monitoring system 30, and rotate beam 9 after the value stabilizes.

[0067] S3. During the rotation of beam 9, the beam deflection monitoring system 30 monitors the horizontal changes, vibrations, and rotational inertia of beam 9 in real time; the spatial attitude measurement system 40 calculates the rotation angle and rotational angular velocity of beam 9 by measuring the three-dimensional coordinates of beam 9 during the rotation; the rotation vertical axis monitoring system 50 continuously monitors the three-dimensional coordinates and horizontal azimuth of the rotation center of beam 9 in real time during the rotation, and displays the horizontal offset value of the rotation axis center and the real-time rotation status of beam 9.

[0068] S4. When beam 9 is about to be rotated into place, use beam axis positioning system 60 to assist in positioning the longitudinal axis of beam 9 and observe the lateral and longitudinal deviation values ​​after positioning.

[0069] S5. After the rotation is completed, the outer contour of beam 9 is scanned as a whole or at the end using a 3D laser scanner or laser profiler in conjunction with a total station. The data from the two scans are compared to obtain the spatial offset value of beam 9 during the rotation process. Then, beam 9 is finely adjusted and reset using hydraulic jacks.

[0070] S6. After the rotation is completed, the construction of the side span cast-in-place section is carried out. The temporary constraints of the support are released, the bottom formwork is removed, and the support is subjected to force. The system conversion is carried out. After the system conversion of beam 9, before the road construction, the creep monitoring of beam 9 is carried out through the spatial attitude measurement system 40 to provide a reference for the next road construction.

[0071] Example 2:

[0072] The basic content is the same as in Example 1, except that:

[0073] See Figures 6 to 11 The beam deflection monitoring system 30 includes a 720-degree deformation monitoring prism 1. Angle steel brackets 3 are installed at the junction of the left and right web plates and the bottom plate at both ends of the beam 9. The upper side of the angle steel brackets 3 is connected to the 720-degree deformation monitoring prism 1 through connecting threads. The spatial attitude measurement system 40 includes multiple 720-degree deformation monitoring prisms 1. Angle steel brackets 3 are installed on both the left and right sides of the lower part of the beam 9. The upper side of the angle steel brackets 3 is connected to the 720-degree deformation monitoring prism 1 through connecting threads. The top of the left and right sides of both ends of the beam 9 is connected to the 720-degree deformation monitoring prism 1 through pre-embedded bolts. The upper end face of both ends of the beam 9 is connected to the 720-degree deformation monitoring prism 1 through pre-embedded bolts.

[0074] Example 3:

[0075] The basic content is the same as Example 2, except that:

[0076] See Figures 6 to 11The 720-degree deformation monitoring prism 1 includes a first top plate 12 and a first bottom plate 11 spaced apart vertically. A threaded hole 116 is provided at the center of the first bottom plate 11. A leveling device 13 for adjusting the parallelism of the two plates is provided between the first bottom plate 11 and the first top plate 12. A mounting groove 117 is provided on the lower side of the first top plate 12. A first motor 14 and a vertical shaft 15 are disposed within the mounting groove 117. The output end of the first motor 14 is connected to a first pinion 16. The vertical shaft 15 is located at the center of the first top plate 12, and a sleeve is fitted on the outer circumference of the lower end of the vertical shaft 15. The system includes a first large gear 17, which meshes with a first small gear 16. The upper end of the vertical shaft 15 passes through the first top plate 12 and is connected to a U-shaped frame 18. The inner bottom wall of the U-shaped frame 18 has a T-shaped horizontal bubble 19. Two first horizontal shafts 110 are horizontally arranged on both sides of the U-shaped frame 18, and a first prism lens 111 connects the two first horizontal shafts 110. A power supply 112 is embedded in one side of the U-shaped frame 18, and a second motor 113 is located on the other side. A second small gear 114 is located at the output end of the second motor 113. A second large gear 115 is provided at the end of the first horizontal shaft 110 near the second motor 113. The second large gear 115 is meshed with the second small gear 114. The first motor 14 and the second motor 113 are connected to the power supply 112. The axis of the vertical shaft 15 intersects the axis of the first horizontal shaft 110 perpendicularly. A receiving groove 118 is provided on the upper side of the first top plate 12. A connecting bearing 119 is provided in the receiving groove 118. The outer ring of the connecting bearing 119 is connected to the inner wall of the receiving groove 118, and the inner ring of the connecting bearing 119 is sleeved on the vertical shaft 114. On the outer circumference of shaft 15, a connecting post 120 is also provided in the receiving groove 118. A connecting plate 121 is connected to the upper side of the connecting post 120. The connecting plate 121 is circular. Both the connecting plate 121 and the connecting post 120 are sleeved on the vertical shaft 15. The connecting plate 121 is connected to the lower side of the U-shaped frame 18. A pointer 122 is provided on the upper side of the connecting plate 121. A circular scale line 123 is provided on the upper side of the first top plate 12. The center of the circular scale line 123 is located on the central axis of the vertical shaft 15. The pointer 122 points to the circular scale line 123.

[0077] Example 4:

[0078] The basic content is the same as in Example 1, except that:

[0079] See Figures 12 to 18The rotating vertical axis monitoring system 50 includes an omnidirectional adaptive prism 2, which is connected to the upper end face of the beam 9 via a tripod 4. The omnidirectional adaptive prism 2 includes a base 22, a mounting shaft 21, a control unit 23, a multi-axis sensor 24, an adjustment module 25, a display module 26, a horizontal rotation module 27, a vertical rotation module 28, a laser ranging module 29, a prism frame 219, and a second prism lens 220. The multi-axis sensor 24, adjustment module 25, display module 26, horizontal rotation module 27, vertical rotation module 28, and laser ranging module 29 are connected to the control unit 23. The control unit 23, multi-axis sensor 24, adjustment module 25, display module 26, and horizontal rotation module 27 are all mounted on the base 22. The mounting shaft 21 is connected to the horizontal rotation module... The 27 is rotatably connected to the base 22. The laser ranging module 29 is connected to the center of the lower end of the mounting shaft 21. The prism frame 219 is connected to the upper end of the mounting shaft 21. The second prism lens 220 is rotatably connected to the prism frame 219. The vertical rotation module 28 is connected to the second prism lens 220. The multi-axis sensor 24 is connected to the control system 10. The adjustment module 25 includes a motor driver 216, two fifth motors 217, and two gear transmission mechanisms 218. The motor driver 216 is connected to the control unit 23. Both fifth motors 217 are connected to the motor driver 216. The output end of the fifth motor 217 is connected to the input end of the gear transmission mechanism 218. The output end of the gear transmission mechanism 218 is connected to the lower end of the support rod 229. The horizontal rotation module 27 includes a third motor 210, a third pinion 211, and a third gear 212. The third motor 210 is connected to the control unit 23 and is connected to the lower side of the top plate 12. The third pinion 211 is connected to the output end of the third motor 210. The third gear 212 is located in the through hole 226 and meshes with the third pinion 211. The third gear 212 is sleeved on the outer circumferential surface of the mounting shaft 21 at its lower end. The vertical rotation module 28 includes a fourth motor 213. The system includes a drive gear 214, a driven gear 215, and a fourth motor 213 connected to the control unit 23. The fourth motor 213 is connected to the outside of the prism frame 219, and its output end passes through the prism frame 219 and is located on the inside of the prism frame 219. The drive gear 214 is connected to the output end of the fourth motor 213, and the driven gear 215 is meshed with the drive gear 214. The second prism lens 220 is rotatably connected to the prism frame 219 via a second horizontal shaft 222, and the driven gear 215 is sleeved on the second horizontal shaft 222.

[0080] Example 5:

[0081] The basic content is the same as in Example 1, except that:

[0082] See Figure 19 The beam axis positioning system 60 includes a plumb bob 5 and an acrylic plate 6. A steel bracket is installed at one end of the beam 9. Three arc-shaped mounting holes on the acrylic plate are connected to the steel bracket by screws and nuts. A cross coordinate scale 61 is set at the center of the acrylic plate 6. The three arc-shaped mounting holes are concentric with the scale axis of the cross coordinate scale 61. The auxiliary line of the cross coordinate scale 61 is circular. The longitudinal axis of the cross coordinate scale 61 coincides with the longitudinal axis of the bridge 9. A tripod 4 is connected to the lower side of the plumb bob 5. The tripod 4 is set on the ground. The plumb bob 5 is arranged relative to the designed longitudinal axis of the beam. A compass 7 and a bubble level 8 are set on the upper side of the acrylic plate 6.

[0083] Example 6:

[0084] The basic content is the same as in Example 1, except that:

[0085] The digital weighing system 20 also includes a multi-axis sensor. The planar position of the multi-axis sensor is located on the center line of the ball joint in the transverse or longitudinal direction of the upper bearing platform. When the beam 9 is weighed with a hydraulic jack, the tilt angle of the upper bearing platform is measured. The vertical displacement distance is calculated using trigonometric functions based on the horizontal distance from the multi-axis sensor to the rotation center.

[0086] Example 7:

[0087] The basic content is the same as in Example 1, except that:

[0088] The spatial attitude measurement system 40 includes a satellite positioning system, which is installed at the center of the line at the end of the beam 9. The satellite positioning system uses differential positioning to measure coordinates and provide feedback on information such as rotation angle and rotation angular velocity.

[0089] Example 8:

[0090] The basic content is the same as in Example 1, except that:

[0091] See Figure 20The beam axis positioning system 60 includes a plumb bob 5 and an acrylic plate 6. A steel bracket is installed at one end of the beam 9. Three arc-shaped mounting holes on the acrylic plate are connected to the steel bracket by screws and nuts. A cross coordinate scale 61 is set at the center of the acrylic plate 6. The three arc-shaped mounting holes are concentric with the scale axis of the cross coordinate scale 61. The auxiliary lines of the cross coordinate scale 61 are in a grid pattern. The longitudinal axis of the cross coordinate scale 61 coincides with the longitudinal axis of the bridge 9. A tripod 4 is connected to the lower side of the plumb bob 5. The tripod 4 is set on the ground. The plumb bob 5 is arranged relative to the designed longitudinal axis of the beam. A compass 7 and a bubble level 8 are set on the upper side of the acrylic plate 6.

[0092] In this invention, a baffle 124 is provided on the outside of the power supply 112 of the 720-degree deformation monitoring prism 1. The baffle 124 is connected to one side of the U-shaped frame 18. A mounting cover 125 is provided on the outside of the second motor 113. The mounting cover 125 is connected to the other side of the U-shaped frame 18. A circuit board 126 is also provided in the mounting groove 117. A solar panel bracket 127 is provided on the upper side of the mounting cover 125. A solar panel 128 is provided on the upper side of the solar panel bracket 127. A switch 130 is provided on the upper side of the first top plate 12. The switch 130, the power supply 112, and the solar panel 128 are all connected to the circuit board 126. The upper end of the first prism lens 111 is provided with a first laser head 129. The leveling device 13 includes a spherical bearing 131 and two connecting screws 132. The outer circumferential surfaces of the two connecting screws 132 are fitted with knurled nuts 133. The lower ends of the two connecting screws 132 are rotatably connected to the first base plate 11, and the upper ends of the two connecting screws 132 are threadedly connected to the first top plate 12. The rod of the spherical bearing 131 is connected to the first base plate 11, and the inner ring of the spherical bearing 131 is rotatably connected to the first top plate 12 through a pin.

[0093] The base 22 of the omnidirectional adaptive prism 2 includes a second top plate 225 and a second bottom plate 224 spaced apart vertically. Both the second top plate 225 and the second bottom plate 224 are equilateral triangular structures. A through hole 226 is opened at the center of the second top plate 225, and a horizontal rotation module 27 is installed inside the through hole 226. A connecting hole 227 is opened at the center of the second bottom plate 224. A rod end joint bearing 228 and two support rods 229 are arranged on the upper side of the second bottom plate 224. The lower end of the rod end joint bearing 228 is connected to a vertex of the second bottom plate 224, and the upper end of the rod end joint bearing 228 is hinged to a vertex of the second top plate 225. The two support rods 229... 29 are located at the other two vertices of the second base plate 224. The upper ends of the two support rods 229 are threaded with adjusting nuts 230. The two adjusting nuts 230 are installed at the other two vertices of the second top plate 225. The adjusting module 25 is connected to the support rods 229 and is used to control the rotation of the support rods 229. The display module 26 includes a circular horizontal bubble 231, a T-shaped horizontal bubble 19, a display 232, and a mechanical compass 233. The circular horizontal bubble 231 is connected to the upper side of the second base plate 224. The T-shaped horizontal bubble 19 and the display 232 are connected to the upper side of the second top plate 225. The mechanical compass 7233 is connected to the inner side of the prism frame 219.

[0094] Displacement sensors can be digital dial indicators. Four hydraulic jacks are placed equidistantly at the four corners of the lower bearing platform along the diagonal of the upper bearing platform, and as close to the edge of the lower bearing platform as possible. This maximizes the lever arm. A pressure sensor is installed in the hydraulic system to detect the pressure of the hydraulic oil. The oil pressure is output as an electrical signal and sent to the computer via an RS485 interface. Eight high-precision digital dial indicators are then installed within a range from the inside of the hydraulic jacks to the outside of the upper raceway. All eight dial indicators are equidistant from the center of the ball joint. Four of these dial indicators coincide with the line connecting the hydraulic jacks or the diagonal of the lower bearing platform. The remaining four... On the bisector between them, a digital micrometer with its probe pointing upwards rests on the upper bearing platform. The digital micrometer is connected to a computer via an 8-channel hub and an RS232 communication interface for easy data retrieval. Before the rotation, after the bridge supports are removed and debris is cleared, the beam is balanced and weighed. The displacement distance is measured using a digital micrometer. The software calculates the position of the bridge's center of gravity and plots the P-Δ relationship curve to determine the critical force value. Counterweights are added to the beam surface to ensure that the bridge's center of gravity coincides with the rotation axis center or that the horizontal distance is kept within the design calculation value, so that the bridge does not tilt during the rotation process.

[0095] After the bottom support of beam 9 is removed before the beam body 9 rotates, the values ​​monitored by the multi-axis sensor are used to monitor the downward deflection curve of beam 9 through software. During the rotation process, this multi-axis sensor can monitor the horizontal changes, shaking, rotational inertia, etc. of beam 9 in real time, and will issue an alarm for sudden vibration, shaking, tilting, etc. of beam 9.

[0096] In the two scans of the outer contour of beam 9 before and after rotation, either as a whole or at the end section, the laser point cloud data undergoes preprocessing such as denoising, simplification, compression, registration and fusion, as well as postprocessing operations such as data segmentation, section line extraction, and section data overlay. By comparing the two sets of data in the output, the deflection value of beam 9 during rotation can be quickly obtained, and a CAD section drawing can be generated for intuitive display or a statistical table can be generated to provide a basis for the hydraulic jack to adjust the beam's attitude. Alternatively, the elevation values ​​in the three-dimensional coordinates measured before and after rotation by the spatial attitude measurement system 40 can be compared, and then the hydraulic jack can be used to fine-tune and reset beam 9.

Claims

1. A monitoring system for the construction of a swing bridge, characterized in that: The system includes a control system (10), a digital weighing system (20), a beam deflection monitoring system (30), a spatial attitude measurement system (40), a rotating vertical axis monitoring system (50), and a beam axis positioning system (60). The digital weighing system (20) is installed between the upper and lower supports of the beam (9). The beam deflection monitoring system (30) is installed at the junction of the web and the bottom plate at both ends of the beam (9). The spatial attitude measurement system (40) is installed at the center of the bridge deck at both ends of the beam (9) and on the left and right sides. The rotating vertical axis monitoring system (50) is installed on the rotation axis of the beam (9). The beam axis positioning system (60) is installed on the longitudinal axis at the end of the beam (9). The beam deflection monitoring system (30) includes a multi-axis sensor (24), which is installed at the junction of the web and the bottom plate at both ends of the beam (9) to monitor the deflection, horizontal change, shaking, and rotational inertia of the beam (9) in real time and send the data to the control system (10). Alternatively, the beam deflection monitoring system (30) includes a 720-degree deformation monitoring prism (1). Angle steel brackets (3) are installed at the junction of the left and right web plates and the bottom plate at both ends of the beam (9). The upper side of the angle steel brackets (3) is connected to the 720-degree deformation monitoring prism (1) through connecting threads. The three-dimensional coordinate values ​​of the 720-degree deformation monitoring prism (1) are measured by a total station and sent to the control system (10). The spatial attitude measurement system (40) includes multiple 720-degree deformation monitoring prisms (1). Angle steel brackets (3) are installed at the junction of the left and right web plates and the bottom plate at both ends of the beam (9). The upper side of the angle steel brackets (3) is connected to the 720-degree deformation monitoring prisms (1) through connecting threads. The top of the left and right sides of both ends of the beam (9) is connected to the 720-degree deformation monitoring prisms (1) through pre-embedded bolts. The upper end face of both ends of the beam (9) is connected to the 720-degree deformation monitoring prisms (1) through pre-embedded bolts. The rotating vertical axis monitoring system (50) includes an all-around adaptive prism (2), which is connected to the upper end face of the beam (9) via a tripod (4). The all-around adaptive prism (2) includes a base (22), a mounting shaft (21), a control unit (23), a multi-axis sensor (24), an adjustment module (25), a display module (26), a horizontal rotation module (27), a vertical rotation module (28), a laser ranging module (29), a prism frame (219), and a second prism lens (220). 29) is connected to the control unit (23). The control unit (23), multi-axis sensor (24), adjustment module (25), display module (26), and horizontal rotation module (27) are all mounted on the base (22). The mounting shaft (21) is rotatably connected to the base (22) through the horizontal rotation module (27). The laser ranging module (29) is connected to the center of the lower end of the mounting shaft (21). The prism frame (219) is connected to the upper end of the mounting shaft (21). The second prism lens (220) is rotatably connected to the prism frame (219). The vertical rotation module (28) is connected to the second prism lens (220). The multi-axis sensor (24) is connected to the control system (10). The base (22) includes a second top plate (225) and a second bottom plate (224) spaced apart vertically. Both the second top plate (225) and the second bottom plate (224) are equilateral triangular structures. A through hole (226) is provided at the center of the second top plate (225), and a horizontal rotating module (27) is provided inside the through hole (226). A connecting hole (227) is provided at the center of the second bottom plate (224). A rod end joint bearing (228) and two support rods (229) are provided on the upper side of the second bottom plate (224). The lower end of the rod end joint bearing (228) is connected to a vertex of the second bottom plate (224), and the upper end of the rod end joint bearing (228) is hinged to a vertex of the second top plate (225). The two support rods (229) are respectively located at... At the other two vertices of the second base plate (224), the upper ends of the two support rods (229) are threaded with adjusting nuts (230). The two adjusting nuts (230) are installed at the other two vertices of the second top plate (225). The adjusting module (25) is connected to the support rods (229) to control the rotation of the support rods (229). The display module (26) includes a circular horizontal bubble (231), a T-shaped horizontal bubble (19), a display (232), and a mechanical compass (233). The circular horizontal bubble (231) is connected to the upper side of the second base plate (224). The T-shaped horizontal bubble (19) and the display (232) are connected to the upper side of the second top plate (225). The mechanical compass (233) is connected to the inner side of the prism frame (219). The digital weighing system (20) is used to balance and weigh the beam (9) before it rotates by using a hydraulic jack and to measure the vertical displacement distance of the beam (9) during weighing, and to send the data to the control system (10). The beam deflection monitoring system (30) is used to monitor the deflection value after the support at the bottom of the beam (9) is removed before the beam (9) is rotated, and to monitor the horizontal change, shaking and rotational inertia of the beam (9) during the rotation process, and send the data to the control system (10). The spatial attitude measurement system (40) is used to measure the three-dimensional coordinates of the beam (9) during the rotation process and calculate the rotation angle and rotation angular velocity of the beam (9), and send the data to the control system (10); The rotating vertical axis monitoring system (50) is used to measure the three-dimensional coordinates and horizontal azimuth of the rotation center of the beam (9) during the rotation process, display the horizontal offset value and real-time rotation status of the rotation axis of the beam (9), and send the data to the control system (10). The beam axis positioning system (60) is used to assist in guiding the beam axis (9) to be in place and to observe the transverse and longitudinal deviation values ​​of the beam after it is in place when the beam (9) is about to be rotated into place. The control system (10) is used to control the digital weighing system (20) to guide the beam surface counterweight so that the beam (9) maintains torque balance before rotation; after the support is removed, the beam (9) deflection change curve is plotted according to the deflection value obtained by the beam deflection monitoring system (30), and the beam (9) is rotated after the deflection value stabilizes; the three-dimensional coordinate value of the rotation center of the beam (9) is continuously measured in real time by the total station, the horizontal azimuth angle of the beam (9) is measured by the multi-axis sensor (24), the real-time rotation status of the beam (9) and the horizontal offset value of the rotation axis are displayed to guide the beam (9) into position; the beam axis positioning system (60) assists in the positioning of the beam (9) axis.

2. The swing bridge rotation construction monitoring system according to claim 1, characterized in that: The digital weighing system (20) includes multiple hydraulic jacks and displacement sensors. The multiple hydraulic jacks and displacement sensors are circumferentially distributed on the upper side of the lower support of the beam (9). The output ends of the multiple hydraulic jacks are connected to the upper support of the beam (9), and the output ends of the multiple displacement sensors are connected to the lower side of the upper support of the beam (9). The multiple hydraulic jacks and displacement sensors are all connected to the control system (10). The control system (10) is used to control the operation of the hydraulic jack and obtain the vertical displacement distance of the beam (9) through the displacement sensor.

3. The swing bridge rotation construction monitoring system according to claim 1, characterized in that: The 720-degree deformation monitoring prism (1) includes a first top plate (12) and a first bottom plate (11) spaced apart vertically. A threaded hole (116) is provided at the center of the first bottom plate (11). A leveling device (13) for adjusting the parallelism of the two is provided between the first bottom plate (11) and the first top plate (12). A mounting groove (117) is provided on the lower side of the first top plate (12). A first motor (14) and a vertical shaft (15) are provided in the mounting groove (117). The output end of the first motor (14) is connected to a first pinion (16). The vertical shaft (15) is located at the center of the first top plate (12). A first large gear (17) is sleeved on the outer circumference of the lower end of the vertical shaft (15). The first large gear (17) meshes with the first pinion (16). The upper end of the vertical shaft (15) passes through the first top plate (12) and is connected to a U-shaped... The frame (18) has a T-shaped horizontal bubble (19) on its inner bottom wall. The two sides of the U-shaped frame (18) are each provided with a first horizontal shaft (110). A first prism lens (111) is connected between the two first horizontal shafts (110). A power supply (112) is embedded in one side of the U-shaped frame (18), and a second motor (113) is provided on the other side. A second small gear (114) is provided at the output end of the second motor (113). A second large gear (115) is provided at the end of the first horizontal shaft (110) near the second motor (113). The second large gear (115) is meshed with the second small gear (114). The first motor (14) and the second motor (113) are connected to the power supply (112). The axis of the vertical shaft (15) intersects the axis of the first horizontal shaft (110) perpendicularly. The control system (10) is used to obtain the three-dimensional coordinate values ​​of multiple 720-degree deformation monitoring prisms (1) through a total station, and to obtain the rotation angle and rotational angular velocity of the beam (9) and the attitude change of the beam (9).

4. The swing bridge rotation construction monitoring system according to claim 3, characterized in that: The first top plate (12) has a receiving groove (118) on its upper side. A connecting bearing (119) is provided in the receiving groove (118). The outer ring of the connecting bearing (119) is connected to the inner wall of the receiving groove (118), and the inner ring of the connecting bearing (119) is sleeved on the outer circumferential surface of the vertical shaft (15). A connecting column (120) is also provided in the receiving groove (118). A connecting plate (121) is connected to the upper side of the connecting column (120). The first top plate (12) is circular, and the connecting plate (121) and the connecting column (120) are both sleeved on the vertical axis (15). The connecting plate (121) is connected to the lower side of the U-shaped frame (18). A pointer (122) is provided on the upper side of the connecting plate (121). A circular scale line (123) is provided on the upper side of the first top plate (12). The center of the circular scale line (123) is located on the central axis of the vertical axis (15). The pointer (122) points to the circular scale line (123).

5. The swing bridge rotation construction monitoring system according to claim 1, characterized in that: The adjustment module (25) includes a motor driver (216), two fifth motors (217), and two gear transmission mechanisms (218). The motor driver (216) is connected to the control unit (23), and both fifth motors (217) are connected to the motor driver (216). The output end of the fifth motor (217) is connected to the input end of the gear transmission mechanism (218), and the output end of the gear transmission mechanism (218) is connected to the lower end of the support rod (229). The horizontal rotation module (27) includes a third motor (210), a third pinion (211), and a third gear (212). The third motor (210) is connected to the control unit (23) and is connected to the lower side of the top plate (12). The third pinion (211) is connected to the output end of the third motor (210), and the third gear (212) is connected to the output end of the third motor (210). The third pinion (211) is located inside the through hole (226) and meshed with the third large gear (212), which is sleeved on the outer circumferential surface of the mounting shaft (21) at the lower end. The vertical rotation module (28) includes a fourth motor (213), a drive gear (214), and a driven gear (215). The fourth motor (213) is connected to the control unit (23). The fourth motor (213) is connected to the outside of the prism frame (219), and its output end passes through the prism frame (219) and is located on the inside of the prism frame (219). The drive gear (214) is connected to the output end of the fourth motor (213), and the driven gear (215) meshes with the drive gear (214). The second prism lens (220) is rotatably connected to the prism frame (219) through the second horizontal shaft (222), and the driven gear (215) is sleeved on the second horizontal shaft (222).

6. The swing bridge rotation construction monitoring system according to claim 1, characterized in that: The beam axis positioning system (60) includes a plumb bob (5) and an acrylic plate (6). The acrylic plate (6) is connected to one end of the beam (9). A cross coordinate scale (61) is set at the center of the acrylic plate (6). The longitudinal axis of the cross coordinate scale (61) coincides with the longitudinal axis of the beam (9). A tripod (4) is connected to the lower side of the plumb bob (5). The tripod (4) is set on the ground. The plumb bob (5) is arranged relative to the designed longitudinal axis of the beam. A compass (7) and a bubble level (8) are set on the upper side of the acrylic plate (6). The beam axis positioning system (60) is used to assist the beam (9) axis in positioning and to observe the lateral and longitudinal deviation values ​​after positioning by means of a plumb bob (5) and a cross coordinate scale (61).

7. A construction method for the swing bridge rotation construction monitoring system as described in claim 1, characterized in that: The construction method includes the following steps: S1. Before rotation, lift the longitudinal and transverse sides of the beam (9) using the digital weighing system (20), and simultaneously obtain the pressure value of the hydraulic oil pressure sensor and the displacement value of the displacement sensor. Calculate the ball joint friction resistance torque of the upper bearing platform, the unbalanced torque of the beam (9), the static friction resistance coefficient of the ball joint, and the eccentricity of the rotating body. Then, select the counterweight position and use the lever principle to calculate the counterweight. Apply the counterweight according to the calculation results to make the structural center of gravity of the beam (9) coincide with the center of rotation axis or keep the horizontal distance within the design value. At this time, the balance weighing of the beam (9) ends. S2. Before rotation, scan the outer contour of the beam (9) as a whole or end section using a three-dimensional laser scanner or laser profiler in conjunction with a total station; monitor the deflection curve of the beam (9) using a beam deflection monitoring system (30), and rotate the beam (9) after the value stabilizes. S3. During the rotation of the beam (9), the beam deflection monitoring system (30) monitors the horizontal changes, shaking, and rotational inertia of the beam (9) in real time. The spatial attitude measurement system (40) calculates the rotation angle and rotational angular velocity of the beam (9) by measuring the three-dimensional coordinates of the beam (9) during the rotation. The rotation vertical axis monitoring system (50) monitors the three-dimensional coordinates and horizontal azimuth of the rotation center of the beam (9) in real time during the rotation, and displays the horizontal offset value and real-time rotation status of the rotation axis of the beam (9). S4. When the beam (9) is about to be rotated into place, the beam axis positioning system (60) is used to assist the longitudinal axis of the beam (9) in positioning and to observe the lateral and longitudinal deviation values ​​after positioning. S5. After the rotation is completed, the outer contour of the beam (9) is scanned as a whole or end section by a three-dimensional laser scanner or laser profiler in conjunction with a total station. The data from the two scans are compared to obtain the spatial offset value of the beam (9) during the rotation process. Then, the beam (9) is finely adjusted and reset by hydraulic jacks. S6. After the rotation is completed, the side span cast-in-place section is constructed. The temporary constraint of the support is released, and the bottom formwork is removed so that the support is subjected to force. The system is converted. After the system conversion of the beam (9) is completed, before the road construction, the creep monitoring of the beam (9) is carried out through the spatial attitude measurement system (40) to provide a reference for the next road construction.

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