Chain type swivel driving device for bridge swivel, construction method and application

Abstract

The invention relates to a chained swivel driving device for bridge swivel, a construction method and application, and belongs to the technical field of bridge construction. Comprising an annular sliding rail, a sliding plate, rotating supporting legs, a pre-buried framework, a large chain wheel, a transmission chain, a small chain wheel, a motor speed reducer and a fixing base. The construction method comprises a preparation stage before construction, wherein the preparation stage comprises technology and field preparation and part machining and factory inspection; the field installation stage comprises installation of an embedded framework, installation of an annular sliding rail, installation of a fixing base and a motor speed reducer, installation of a rotating supporting leg and a sliding plate, splicing of a large chain wheel and installation of a transmission chain; the swivel operation real-time monitoring and dynamic adjusting stage comprises swivel starting and swivel adjusting and emergency processing; and the disassembling and multiplexing stage comprises part disassembling and part detection and multiplexing preparation. The problems that in the prior art, rotation precision, the construction period and construction are tedious, and the pier body structure is bloated can be effectively solved.

Description

Technical Field

[0001] This invention relates to a driving device, particularly a chain-type rotating driving device for bridge rotation, its construction method, and its application, belonging to the field of bridge construction technology. Background Technology

[0002] The horizontal rotation method, as the core technology of bridge rotation construction, has been widely used in various bridge types such as continuous beam bridges, rigid frame bridges, and arch bridges. Its rotation system is usually set at the bottom, middle, or top of the pier. Among them, the rotation at the top of the pier has become increasingly widely used in engineering practice in recent years due to its advantages such as reducing masonry work, lowering the center of gravity, and adapting to complex sites.

[0003] However, existing pier-top rotation drive systems still have significant shortcomings. Traditional rack and pinion drives require high installation precision but have long construction periods; steel strand drives have reaction seats located far from the turntable, resulting in a bulky pier structure. Therefore, optimizing the drive system structure and construction methods is crucial to improving the technology's economy and applicability in pier-top rotation. Summary of the Invention

[0004] In view of the above-mentioned defects in the existing technology, the present invention proposes a chain-type rotation drive device for bridge rotation, a construction method and application, which solves the problems of accuracy, construction period, cumbersome construction and bulky pier structure in the existing technology.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A chain-type rotating drive device for bridge rotation includes an upper beam and a lower pier. The chain-type rotating drive device is located on the outer periphery of the bottom of the upper beam and includes an annular slide rail, a sliding plate, rotating legs, a pre-embedded frame, a large sprocket, a transmission chain, a small sprocket, a motor reducer, and a fixed base. The annular slide rail is welded from steel plates and threaded steel bars, with an L-shaped cross-section, partially enclosing the bottom and sides of the upper beam. An embedded frame is fixed to the top of the lower pier, and the rotating support leg is fixed to the embedded frame. Several embedded frames and rotating support legs are evenly distributed along the circumference of the upper beam. The rotating support leg is positioned opposite the bottom surface of the annular slide rail. The large sprocket is assembled from multiple chain tooth units and fixed to the outside of the annular slide rail. The motor reducer is fixedly mounted on a fixed seat on the outside of the upper beam, with an output shaft extending from the top of the reducer, and the small sprocket is mounted on the top of the output shaft. The transmission chain connects the outer sides of the large and small sprockets, transmitting power and driving the upper beam to rotate.

[0006] Furthermore, the annular slide rail is welded from steel plates and threaded steel bars, and is connected and fixed to the pre-embedded bars in the upper beam, thereby achieving fixation in the upper beam; the flatness tolerance of the lower surface of the annular slide rail is controlled within ±0.5mm.

[0007] Furthermore, the pre-embedded frame is composed of frame steel plates and angle steel, and the top of the pre-embedded frame has pre-set threaded holes for connection with the rotating support leg bolts; the pre-embedded frame is installed and fixed in the lower pier by pre-embedded reinforcing bars; the rotating support leg is made of cast steel or welded steel, with a groove on the top for setting a sliding plate, and the rotating support leg is fixed to the pre-embedded frame by bolts; the fixing seat is fixed to the lower pier by expansion bolts, and the top of the fixing seat is provided with a horizontal adjustment shim for fine adjustment of the level of the motor reducer; the large sprocket chain tooth unit is made of 40Cr steel, surface tempered, with a hardness of HRC58-62, and the large sprocket is fixed to the outer side of the annular slide rail by connecting lugs evenly distributed along the circumference.

[0008] Furthermore, the small sprocket is fixed to the motor reducer by a "key connection + shaft end retaining ring", that is, the small sprocket is fixed to the top output shaft of the motor reducer by a key connection, and a retaining ring is provided on the outer side of the small sprocket and the end of the output shaft.

[0009] A construction method for a chain-type rotation drive device for bridge rotation, which employs the aforementioned chain-type rotation drive device for bridge rotation, includes the following specific steps: S1. Pre-construction preparation phase, including: S11. Technical and site preparation and S12. Component processing and factory inspection; S2. On-site installation phase, including: S21: installation of pre-embedded frame, S22: installation of circular slide rail, S23: installation of fixed base and motor reducer, S24: installation of rotating support leg and slide plate, and S25: splicing of large sprocket and installation of transmission chain; S3. Real-time monitoring and dynamic adjustment phase of the rotation operation, including S31. Rotation start-up and S32. Rotation adjustment and emergency handling; S4. Disassembly and Reuse Phase, including S41. Component Disassembly and S42. Component Inspection and Reuse Preparation.

[0010] Furthermore, the S1. pre-construction preparation stage specifically includes: S11. Technical and Site Preparation A. Technical briefing: Organize construction, technical, and quality inspection personnel to conduct technical briefings, clarifying the structural parameters, installation logic, and quality standards of each component of the equipment, and focusing on key operational points; B. On-site survey: Use a total station to detect the positional deviation of the embedded reinforcement bars in the upper beam, mark the evenly distributed points of the embedded skeleton, and ensure that the points coincide with the projection of the annular slide rail of the upper beam; C. Equipment and tool preparation: Prepare laser leveling instrument, torque wrench, frequency converter control cabinet, chain tension tester, total station, hoisting equipment and special disassembly tools; S12. Component machining and factory inspection Processing must be completed according to the technical requirements of each component of the device, and factory testing must be performed. Unqualified components are strictly prohibited from leaving the factory.

[0011] Furthermore, the S2. on-site installation phase specifically includes: S21: Installation of pre-embedded frame First, according to the marked locations of the pre-embedded skeleton, an installation platform for the pre-embedded skeleton is erected using angle steel, and the flatness of the upper surface of the pre-embedded skeleton is adjusted; second, the pre-embedded skeleton is fixed to the installation platform; third, the pre-embedded steel bars are tied; and finally, concrete is poured for curing. S22: Circular slide rail installation, including A. Slide rail splicing: Hoist each section of the circular slide rail to the bottom of the upper beam. Adjacent slide rail sections are beveled and welded. After welding, grind the weld with an angle grinder to ensure that the lower surface of the slide rail is continuous and flat. The threaded steel bars on the slide rail are welded and fixed to the pre-embedded bars in the beam. B. Accuracy calibration: Use a total station to check along the circumference of the circular slide rail and adjust the position of the circular slide rail to make the lower surface flat; at the same time, use a total station to check the coaxiality between the center of the circular slide rail and the center of rotation to ensure that the circular slide rail does not wobble during rotation. S23: Mounting of the fixed base and motor reducer A. Fixing the mounting base: Place the mounting base at the motor reducer installation position on the top surface of the bridge pier, and use expansion bolts to fasten the mounting base to the bridge pier. Tighten the bolts. B. Motor reducer placement: Use a level to check the flatness of the top surface of the fixed base, and use 2-5mm thick stainless steel adjusting shims to ensure the flatness is ≤±0.1mm; hoist the motor reducer to the top surface of the fixed base and fix it to the fixed base with bolts, and fix the small sprocket to the motor reducer with "key connection + shaft end retaining ring"; C. Variable frequency parameter settings: Set the rotation speed, acceleration time, and deceleration time in the variable frequency control cabinet to avoid excessive impact during start-up / stop; set the torque feedback threshold to automatically stop the machine when the rotation resistance is abnormal; D. Forward and reverse rotation test: Start the motor reducer and control the large sprocket to rotate forward and reverse to ensure that the forward and reverse rotation directions are correct; S24: Rotating support leg and skateboard installation A. Skateboard Inlay: Apply epoxy resin evenly to the groove at the top of the rotating support leg and inlay the skateboard therein; B. Fixing the rotating outrigger: Hoist the rotating outrigger to the top surface of the pre-embedded frame, aligning the bolt holes of the outrigger with the pre-set threaded holes of the pre-embedded frame; insert the quick-release bolts and tighten them in multiple stages with a torque wrench to prevent uneven force on the bolts; S25: Large sprocket splicing and drive chain installation Sprocket assembly: Place each chain tooth unit along the outer circumference of the annular slide rail, and position adjacent units using templates to ensure tooth pitch alignment; insert high-strength bolts and tighten them, and use a tooth pitch meter to check that the overall tooth pitch error of each chain tooth unit is ≤±0.2mm to avoid meshing jamming; Drive chain connection: Wrap the drive chain around the large sprocket and the small sprocket, install the tension wheel, and ensure that the drive chain tension meets the requirement of "sag ≤ 10mm / m"; use chain link pins to connect the drive chain joints, and apply grease to the joints.

[0012] Furthermore, the S3. Real-time monitoring and dynamic adjustment stage of the rotation operation includes: S31. Rotation Start A. Turn on the power; B. Formal Rotation: Start the rotation at the set speed, and assign monitoring personnel to be responsible for: 1) real-time monitoring of the rotation displacement with a total station; 2) monitoring of torque with a frequency converter control cabinet; 3) transmission chain tension. S32. Rotation Adjustment and Emergency Handling A. Fine-tuning: If the rotation deviation is detected to exceed ±1.5mm, the motor speed is fine-tuned through the frequency converter control cabinet. The deviation is gradually corrected by utilizing the meshing redundancy between the large sprocket and the transmission chain to ensure that the final positioning deviation is ≤±2mm. B. Emergency shutdown: If the torque exceeds the threshold or there is abnormal noise from the drive chain, the shutdown protection will be triggered immediately; check the cause, remove foreign objects or adjust the sprocket position, and then restart the rotation; C. Rotation and Positioning: When the rotation angle is about to reach the required angle, the motor reducer stops according to the set deceleration time, and the annular slide rail is temporarily fixed to the bridge pier with structural steel; the total station finally checks that the positioning deviation meets the relevant standard requirements, and the rotation operation is completed.

[0013] Furthermore, the S4. disassembly and reuse stage specifically includes: S41. Component Disassembly A. Disassembly of the transmission system: First, remove the transmission link pin and take out the transmission chain; then remove the retaining ring and key at the end of the small sprocket shaft and remove the small sprocket; finally, loosen the motor reducer fixing bolts and separate it from the mounting base; B. Disassembly of the rotating outrigger and large sprocket: Remove the splicing bolts and positioning pins of the segmented large sprocket, and lift the chain tooth unit apart segment by segment; loosen the quick-release bolts of the rotating outrigger, and remove the rotating outrigger and the slide plate; S42. Component Inspection and Reuse Preparation Reuse Testing: Each disassembled component is tested individually. Components meeting the following standards can be reused: 1) Large sprocket tooth wear ≤ 0.8mm; 2) Rotating support leg bolt holes free from deformation; 3) Slide plate surface free of cracks; 4) Motor reducer torque feedback accuracy ≤ ±3%. Component maintenance: Clean, lubricate, and classify qualified components for storage, ready for direct use in the next project.

[0014] The aforementioned chain-type rotation drive device for bridge rotation is applicable to rotating bridges with a rotation weight of 500-40,000 tons.

[0015] By adopting the above technical solution, the present invention has at least one of the following beneficial effects compared with the prior art: The technical solution of this invention has the following innovative points: Innovation Point 1: Compatibility and Synergy between Large Sprocket and Circular Rail Traditional large sprockets are integral and cannot be adapted to rails of different diameters; this invention adopts a "segmented chain tooth unit" structure, which can adjust the number of splicing segments according to the diameter of the circular rail, resulting in high adaptability; Innovation Point 2: The reusable core components (rotating outriggers, motor reducer, large / small sprockets) with detachable structure and mechanical stability all adopt "quick-release bolts", which shortens the disassembly time; the safety of reuse is verified through mechanical calculations: the fatigue strength of the rotating outrigger bolt connection (strength decay rate ≤5% after repeated disassembly and assembly 5 times) and the wear of the sprocket tooth surface (≤0.8mm after 8 reuses, still meeting the transmission requirements) have a reuse rate of over 90% (the reuse rate of traditional devices is 0%). Innovation Point 3: The sliding pair of the skateboard and the power control work together with precision, resulting in a low coefficient of friction and low power demand; the motor reducer adopts "frequency conversion speed regulation + torque feedback" to adjust the speed in real time and avoid precision deviation caused by torque fluctuations during rotation.

[0016] The present invention discloses a chain-driven rotating device for bridge rotation, wherein the rotating outriggers, large sprockets, transmission chain, small sprockets, motor reducer, and fixed base are all detachable and can be repeatedly applied to multiple projects, reducing project costs. Furthermore, the installation accuracy of chain drive is much lower than that of gear drive, shortening the installation period.

[0017] The method of this invention is based on the core innovation of "segmented adaptation, quick disassembly and reuse, and low-friction precision transmission" of the chain-type rotation drive device. It focuses on the whole process of "component processing, on-site installation, debugging, rotation operation, disassembly and reuse", and clarifies the operation specifications, technical parameters and quality control standards of each link. This ensures that the device can be repeatedly implemented in bridge pier rotation projects and can fully reflect the technical advantages of "reducing installation accuracy requirements, improving reuse rate and ensuring rotation accuracy".

[0018] By clearly defining the operational specifications and technical parameters of each step, the method of this invention not only enables the repeatability of the device, but also fully embodies the innovative value of "segmented adaptation, quick disassembly and reuse, and low-friction precision transmission," solving the technical pain points of traditional drive systems such as "difficult installation, high cost, and non-reusability." Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the installation position of the chain-type rotating drive device of the present invention; Figure 2 This is a schematic diagram of the structural composition of the chain-type rotating drive device of the present invention; Figure 3 This is a schematic diagram of the arrangement of the large and small sprockets of the present invention; Figure 4 This invention describes the construction method and process of the chain-type rotation drive device for bridge rotation. Detailed Implementation

[0020] The following is in conjunction with the appendix Figure 1-4 The present invention will be further described in detail below to facilitate a clear understanding of the invention, but these descriptions do not constitute a limitation thereof.

[0021] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Example 1 As attached Figure 1-3 As shown in the figure, this embodiment of a bridge rotation chain drive device, such as... Figure 1 As shown, the structure includes an upper beam 1 and a lower pier 2. The bottom of the upper beam 1 and the top surface of the lower pier 2 are respectively provided with opposing arc-shaped upper ball joints 3 and lower ball joints 4. A vertical central ball joint 5 is inserted into the center of the upper ball joints 3 and lower ball joints 4. A chain-type rotation drive device is located on the outer periphery of the bottom of the upper beam 1, as shown... Figure 2 As shown, it includes a circular slide rail 6, a sliding plate 7, a rotating support leg 8, a pre-embedded frame 9, a large sprocket 10, a transmission chain 11, a small sprocket 12, a motor reducer 13, and a fixed base 14.

[0024] The annular slide rail 6 is welded from steel plates and threaded steel bars, with an L-shaped cross-section. It partially encloses the bottom and sides of the upper beam 1. The annular slide rail 6 is also welded from steel plates 61 and threaded steel bars 62, and is connected and fixed to the pre-embedded bars in the upper beam 1, thus achieving fixation within the upper beam 1. The flatness tolerance of the lower surface of the annular slide rail 6 is controlled within ±0.5mm.

[0025] The embedded frame 9 is fixed to the top surface of the lower pier 2. The embedded frame 9 consists of frame steel plates 91 and angle steel 92. The top of the embedded frame 9 has pre-drilled threaded holes for bolt connection with the rotating support leg 8. The embedded frame 9 is installed and fixed in the lower pier 2 via embedded reinforcing bars. The rotating support leg 8 is fixed to the embedded frame 9. The rotating support leg 8 is made of cast steel or welded steel, with a groove on its top for mounting a sliding plate 7. The rotating support leg 8 is bolted to the embedded frame 9. Several embedded frames 9 and rotating support legs 8 are evenly distributed along the circumference of the upper beam 1. The rotating support leg 8 corresponds to the bottom surface of the annular slide rail 6, with a sliding plate 7 between them. The sliding plate 7 is made of polytetrafluoroethylene (PTFE), modified PTFE, or ultra-high molecular weight polyethylene (UHMWPE), and is embedded and fixed in the groove on the upper surface of the rotating support leg 8. The upper surface of the sliding plate 7 forms a sliding pair with the lower surface of the annular slide rail 6, reducing friction during rotation.

[0026] like Figure 2-3 As shown, the large sprocket 10 is composed of multiple chain tooth units. The inner diameter of the large sprocket 10 matches the outer diameter of the annular slide rail 6 and is fixed to the outside of the annular slide rail 6. In this embodiment, the chain tooth units of the large sprocket 10 are made of 40Cr steel, with a surface tempering and a hardness of HRC58-62. The large sprocket 10 is bolted to the outside of the annular slide rail 6 via connecting lugs evenly distributed along the circumference. The motor reducer 13 is located on the outside of the upper beam 1 and is bolted to the fixed seat 14. The fixed seat 14 is located on the top surface of the lower pier 2 and is fixed to the lower pier 2 by expansion bolts. A horizontal adjustment shim is provided on the top of the fixed seat 14 for fine-tuning the horizontality of the motor reducer 13. The motor reducer 13 has an output shaft extending from its top. A small sprocket 12 is mounted on the top of the output shaft. The small sprocket 12 is fixed to the motor reducer via a key connection and a shaft end retaining ring. Specifically, the small sprocket 12 is fixed to the top output shaft of the motor reducer 13 via a key connection, and a retaining ring is provided on the outer side of the small sprocket 12 and the end of the output shaft. A transmission chain 11 connects the outer sides of the large sprocket 10 and the small sprocket 12, transmitting power and driving the upper beam 1 to rotate.

[0027] Example 2 like Figure 4 As shown, combined with Figure 1-3This embodiment describes a construction method for a chain-type rotating drive device for bridge rotation, which uses the chain-type rotating drive device for bridge rotation described in Embodiment 1. The specific implementation steps are as follows, using the "2000-ton pier top rotation project" (circular slide rail diameter 12m, rotation angle 90°) as an example: S1. The pre-construction preparation phase includes: S11. Technical and Site Preparation A. Technical Briefing: Organize technical, construction, and quality control personnel to conduct technical briefings, clarifying the structural parameters (such as the flatness of the lower surface of the slide rail ±0.5mm, and the surface hardness of the chain tooth unit HRC58-62), installation logic, and quality standards of each component of the device (circular slide rail, large sprocket, sliding plate, etc.). Emphasis should be placed on explaining the operational key points of innovative features such as "large sprocket splicing process," "quick-release bolt torque control," and "variable frequency speed regulation torque feedback." B. On-site survey: Use a total station to detect the position deviation of the pre-embedded reinforcement of the upper beam 1, mark the evenly distributed points of the pre-embedded skeleton 9, and ensure that the points coincide with the projection of the annular slide rail 6 of the upper beam 1. C. Equipment and Tool Preparation: Prepare a laser level (accuracy 0.01mm / m), torque wrench (range 0-500N•m, accuracy ±3%), frequency converter control cabinet (supports 0-50Hz speed regulation, with torque feedback module), chain tension tester, total station (displacement monitoring accuracy ±0.5mm), hoisting equipment (5-20 ton truck crane, adaptable to component weight) and special disassembly tools (quick-release bolt sleeves); S12. Component machining and factory inspection All components of the device must be manufactured according to their technical requirements and undergo factory testing. Any unqualified components are strictly prohibited from leaving the factory. Specific requirements are as follows:

[0028] S2. On-site installation phase, including: S21: Installation of pre-embedded frame (fixation of lower pier) First, according to the marked locations of the pre-embedded skeleton 9, an installation platform for the pre-embedded skeleton is erected using angle steel, and the flatness of the upper surface of the pre-embedded skeleton 9 is adjusted to ≤±0.5mm; second, the pre-embedded skeleton 9 is fixed to the installation platform; third, the pre-embedded steel bars are tied; finally, concrete is poured and cured for 7 days. S22: Installation of 6-ring slide rails (upper beam transmission foundation), including A. Slide rail splicing: Hoist each section of the ring slide rail 6 to the lower part of the upper beam 1. Adjacent slide rail sections are beveled and welded. After welding, grind the weld with an angle grinder to ensure that the lower surface of the slide rail is continuous and flat. The threaded steel bars 62 pre-set on the slide rail are welded and fixed to the pre-embedded bars of the beam. B. Accuracy calibration: Use a total station to check one point every 2m along the circumference of the ring slide rail 6, and adjust the position of the ring slide rail 6 so that the flatness of the lower surface is ≤±0.5mm; at the same time, use a total station to check the coaxiality between the center of the ring slide rail 6 and the center of rotation is ≤±1mm to ensure that the ring slide rail 6 has no eccentric wobbling during rotation. The following items must be installed on the bridge before the rotation construction: S23: Mounting of the fixed base 14 and the motor reducer 13 (power system positioning) A. Fixing the fixed seat 14: Place the fixed seat 14 at the installation position of the motor reducer 13 on the top surface of the pier (6m from the center of rotation, corresponding to the meshing point of the large sprocket). Use M20 expansion bolts to fasten the fixed seat to the pier. The bolt tightening torque is 300 N•m. B. Positioning of motor reducer 13: Use a level to check the flatness of the top surface of the fixed base 14, and use 2-5mm thick stainless steel adjusting shims to make the flatness ≤±0.1mm; hoist the motor reducer 13 to the top surface of the fixed base 14 and connect and fix it to the fixed base 14 with bolts. The small sprocket 12 and the motor reducer 13 are fixed with "key connection + shaft end retaining ring"; C. Variable frequency parameter settings: Set the rotation speed, acceleration time, and deceleration time in the variable frequency control cabinet to avoid excessive impact during start-up / stop; set the torque feedback threshold to automatically stop the machine when the rotation resistance is abnormal; D. Forward and reverse rotation test: Start the motor reducer 13, control the large sprocket 10 to rotate 5 revolutions forward and 5 revolutions in reverse to ensure that the forward and reverse rotation directions are correct; Before the bridge rotation construction, the following items were installed after weighing and counterweighting: S24: Installation of rotating support leg 8 and skateboard 7 (supporting the sliding system) A. Slide 7 Inlay: Apply epoxy resin evenly to the groove at the top of the rotating support leg 8 and inlay the slide 7 therein; B. Fixing the rotating support leg 8: Hoist the rotating support leg 8 to the top surface of the pre-embedded frame 9, aligning the bolt holes of the support leg 9 with the pre-set threaded holes of the pre-embedded frame 9; insert the quick-release bolts, and tighten them in three stages with a torque wrench at a torque of 350 N•m (initial tightening 50%, secondary tightening 80%, and final tightening 100%) to prevent uneven stress on the bolts. S25: Large sprocket 10 splicing and drive chain 11 installation (power transmission system) Sprocket assembly: Place each chain tooth unit along the outer circumference of the annular slide rail 6, and position adjacent units using templates to ensure tooth pitch alignment; insert high-strength bolts and tighten them to a torque of 200 N•m. Use a tooth pitch meter to check that the overall tooth pitch error of each chain tooth unit is ≤ ±0.2 mm to avoid meshing jamming. Connection of transmission chain 11: Wrap transmission chain 11 around the large sprocket 10 and the small sprocket 12, install tension wheel, and make the tension of transmission chain meet the requirement of "droop ≤ 10mm / m" (measured with a ruler); use chain link pin to connect the transmission link port, and apply grease to the interface; S3. Real-time monitoring and dynamic adjustment phase of the rotation operation, including S31. Rotation Start A. Turn on the power; B. Formal Rotation: Start the rotation at the set speed, and assign 3 monitoring personnel to be responsible for: 1) Real-time monitoring of rotation displacement with a total station (record once every 5°, and issue an early warning when the deviation exceeds ±1.5mm); 2) Monitoring of torque with the frequency converter control cabinet (the real-time displayed value deviates from the design value by ≤±5%); 3) Tension of the transmission chain (check once every 10°, and there should be no significant change in the amount of sag). S32. Rotation Adjustment and Emergency Handling A. Fine-tuning: If the rotation deviation is detected to exceed ±1.5mm, the motor speed is fine-tuned (±0.1° / min) through the frequency converter control cabinet. The deviation is gradually corrected by utilizing the meshing redundancy between the large sprocket 10 and the transmission chain 11 (stabilize by 3° after each adjustment, and then determine whether to continue adjusting) to ensure that the final positioning deviation is ≤±2mm. B. Emergency shutdown: If the torque exceeds the threshold (>150N•m) or there is abnormal noise from the drive chain, the shutdown protection will be triggered immediately; check the cause (such as foreign objects on the slide plate, or jammed sprocket engagement), clean the foreign objects or adjust the sprocket position, and then restart the rotation (all bolts must be retightened before restarting). C. Rotation and Positioning: When the rotation angle reaches the required angle, such as 90°, the motor reducer 13 stops after the set deceleration time, and the annular slide rail 6 is temporarily fixed to the bridge pier with steel profiles; the total station finally detects the positioning deviation as ±1.7mm, which meets the first-level accuracy requirements of the "Technical Specification for Rotation Construction of Highway Bridges" (JTG / T 3650-2020) and other relevant standard requirements, and the rotation operation is completed; S4. Disassembly and Reuse Phase S41. Component Disassembly (in the order of "transmission first, then support; upper part first, then lower part") A. Disassembly of the transmission system: First, remove the pin at the interface of the transmission chain 11 and take off the transmission chain 11; then remove the retaining ring and key at the shaft end of the small sprocket 12 and remove the small sprocket 12; finally, loosen the fixing bolts of the motor reducer 13 and separate it from the fixing seat 14 (the fixing seat can be left on the pier for subsequent construction); B. Disassembly of rotating support leg 8 and large sprocket 10: Remove the splicing bolts and positioning pins of the segmented large sprocket 10, and lift the chain tooth unit off segment by segment; loosen the quick-release bolts of rotating support leg 8, and remove rotating support leg 8 and slide plate 7. S42. Component Inspection and Reuse Preparation Reuse Inspection: Each disassembled component is inspected individually. Components meeting the following standards can be reused: 1) Wear of the chain teeth of the large sprocket 10 ≤ 0.8mm (measured with a micrometer); 2) No deformation of the bolt holes of the rotating support leg 8 (hole diameter deviation ≤ ±0.2mm); 3) No cracks on the surface of the slide plate 7; 4) Torque feedback accuracy of the motor reducer 13 ≤ ±3%. Component maintenance: Clean qualified components (remove surface oil and concrete residue), lubricate (apply anti-rust grease to sprocket teeth and lubricate output bearings), and store them in categories (fix the chain tooth units with special brackets to avoid collision and deformation), so that they can be put into use directly in the next project.

[0029] Example 3 This embodiment is an application of the chain-type rotating drive device for bridge rotation in Embodiment 1, which is suitable for rotating bridges with a rotation weight of 500-40000 tons.

[0030] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the structure of the present invention. The arrangement and quantity of the present invention are not limited to this example and can be optimized according to actual engineering conditions. Any modifications, equivalent changes, and decorations made to the above embodiments based on the technical principles of the present invention, without departing from the scope of the present invention, are still within the scope of the present invention.

Claims

1. A chain-type rotating drive device for bridge rotation, comprising an upper beam (1) and a lower pier (2), characterized in that: The chain-type rotating drive device is located on the outer periphery of the bottom of the upper beam (1) and includes an annular slide rail (6), a slide plate (7), a rotating support leg (8), a pre-embedded frame (9), a large sprocket (10), a transmission chain (11), a small sprocket (12), a motor reducer (13), and a fixed seat (14). The annular slide rail (6) is welded from steel plates and threaded steel bars. It has an L-shaped cross-section and is partially wrapped around the bottom and side surfaces of the upper beam (1). The pre-embedded frame (9) is fixed on the top surface of the lower pier (2). The rotating support leg (8) is fixed on the pre-embedded frame (9). Several pre-embedded frames (9) and rotating support legs (8) are evenly distributed along the circumference of the upper beam (1). The rotating support leg (8) is set opposite to the bottom surface of the annular slide rail (6). The large sprocket (10) is spliced ​​from multiple chain tooth units and fixed on the outside of the annular slide rail (6). The motor reducer (13) is fixed on the fixed seat (14) on the outside of the upper beam (1). The motor reducer (13) has an output shaft extending from the top, and the small sprocket (12) is set on the top of the output shaft. The transmission chain (11) connects the outer sides of the large sprocket (10) and the small sprocket (12) to transmit power and drive the upper beam (1) to rotate.

2. The chain-type rotating drive device for bridge rotation according to claim 1, characterized in that: The annular slide rail (6) is welded from steel plate (61) and threaded steel bar (62) and is connected and fixed to the pre-embedded bar in the upper beam (1) so as to be fixed in the upper beam (1); the flatness tolerance of the lower surface of the annular slide rail (6) is controlled within ±0.5mm.

3. A chain-type rotating drive device for bridge rotation according to claim 2, characterized in that: The pre-embedded frame (9) is composed of a frame steel plate (91) and angle steel (92). The pre-embedded frame (9) has a pre-set threaded hole at the top for bolt connection with the rotating support leg (8). The pre-embedded frame (9) is installed and fixed in the lower pier (2) by pre-embedded reinforcement. The rotating support leg (8) is made of cast steel or welded steel. A groove is opened at the top for setting the sliding plate (7). The rotating support leg (8) is fixed on the pre-embedded frame (9) by bolt connection. The fixed seat (14) is fixed on the lower pier (2) by expansion bolts. The fixed seat (14) is provided with a horizontal adjustment shim at the top for fine adjustment of the level of the motor reducer (13). The chain tooth unit of the large sprocket (10) is made of 40Cr steel, with surface tempering and a hardness of HRC58-62. The large sprocket (10) is bolted to the outer side of the annular slide rail (6) by connecting ear plates evenly distributed along the circumference.

4. A chain-type rotating drive device for bridge rotation according to claim 3, characterized in that: The small sprocket (12) is fixed to the motor reducer by "key connection + shaft end retaining ring", that is, the small sprocket (12) and the top output shaft of the motor reducer (13) are fixed by key connection, and a retaining ring is provided on the outer side of the small sprocket (12) and the end of the output shaft.

5. A construction method for a chain-type rotation drive device for bridge rotation, comprising using the chain-type rotation drive device for bridge rotation as described in claim 4, characterized in that... The specific steps are as follows: S1. Pre-construction preparation phase, including: S11. Technical and site preparation and S12. Component processing and factory inspection; S2. On-site installation stage, including: S21: installation of pre-embedded frame, S22: installation of ring slide rail (6), S23: installation of fixed seat (14) and motor reducer (13), S24: installation of rotating support leg (8) and slide plate (7) and S25: splicing of large sprocket (10) and installation of transmission chain (11); S3. Real-time monitoring and dynamic adjustment phase of the rotation operation, including S31. Rotation start-up and S32. Rotation adjustment and emergency handling; S4. Disassembly and Reuse Phase, including S41. Component Disassembly and S42. Component Inspection and Reuse Preparation.

6. The construction method according to claim 5, characterized in that, The aforementioned S1. pre-construction preparation stage specifically includes: S11. Technical and Site Preparation A. Technical briefing: Organize construction, technical, and quality inspection personnel to conduct technical briefings, clarify the structural parameters, installation logic, and quality standards of each component of the equipment, and focus on explaining the key points of operation; B. On-site survey: Use a total station to detect the position deviation of the pre-embedded reinforcement of the upper beam (1), mark the evenly distributed points of the pre-embedded skeleton (9), and ensure that the points coincide with the projection of the annular slide rail (6) of the upper beam (1); C. Equipment and tool preparation: Prepare laser leveling instrument, torque wrench, frequency converter control cabinet, chain tension tester, total station, hoisting equipment and special disassembly tools; S12. Component machining and factory inspection Processing must be completed according to the technical requirements of each component of the device, and factory testing must be performed. Unqualified components are strictly prohibited from leaving the factory.

7. The construction method according to claim 6, characterized in that: The S2. on-site installation phase specifically includes: S21: Installation of pre-embedded frame First, according to the marked locations of the embedded skeleton (9), an installation platform for the embedded skeleton is erected using angle steel, and the flatness of the upper surface of the embedded skeleton (9) is adjusted; second, the embedded skeleton (9) is fixed to the installation platform; third, the embedded steel bars are tied; and finally, concrete is poured for curing. S22: Installation of the circular slide rail (6), including A. Slide rail splicing: hoist each section of the ring slide rail (6) to the lower part of the upper beam (1), and use bevel welding for adjacent slide rail sections. After welding, grind the weld with an angle grinder to ensure that the lower surface of the slide rail is continuous and flat; weld the threaded steel bars (62) on the slide rail to the pre-embedded steel bars of the beam. B. Accuracy calibration: Use a total station to check along the circumference of the circular slide rail (6) and adjust the position of the circular slide rail (6) to make the lower surface flat; at the same time, use a total station to check the coaxiality between the center of the circular slide rail (6) and the center of rotation to ensure that the circular slide rail (6) does not wobble eccentrically during rotation. S23: Mounting of the fixed base (14) and the motor reducer (13) A. Fixing the fixing seat (14): Place the fixing seat (14) at the installation position of the motor reducer (13) on the top surface of the bridge pier, and use expansion bolts to fasten the fixing seat to the bridge pier. Tighten the bolts. B. Positioning of the motor reducer (13): Use a level to check the flatness of the top surface of the fixed seat (14), and make the flatness ≤ ±0.1mm by inserting 2-5mm thick stainless steel adjusting shims; hoist the motor reducer (13) to the top surface of the fixed seat (14) and connect and fix it to the fixed seat (14) with bolts; the small sprocket (12) and the motor reducer (13) are fixed by "key connection + shaft end retaining ring"; C. Variable frequency parameter settings: Set the rotation speed, acceleration time, and deceleration time in the variable frequency control cabinet to avoid excessive impact during start-up / stop; set the torque feedback threshold to automatically stop the machine when the rotation resistance is abnormal; D. Forward and reverse rotation test: Start the motor reducer (13) and control the large sprocket (10) to rotate forward and reverse to ensure that the forward and reverse rotation directions are correct; S24: Rotating support leg (8) and skateboard (7) installation A. Slideboard (7) inlay: Apply epoxy resin evenly to the groove at the top of the rotating support leg (8) and inlay the slideboard (7) therein; B. Fixing the rotating support leg (8): Hoist the rotating support leg (8) to the top surface of the pre-embedded frame (9) so that the bolt holes of the support leg (9) are aligned with the pre-set threaded holes of the pre-embedded frame (9); insert the quick-release bolts and tighten them in multiple times with a torque wrench to prevent uneven force on the bolts; S25: Large sprocket (10) splicing and drive chain (11) installation Sprocket splicing: Place each chain tooth unit along the outer circumference of the annular slide rail (6), and position adjacent units by template to ensure tooth pitch alignment; insert high-strength bolts and tighten them, and use a tooth pitch meter to check the overall tooth pitch error of each chain tooth unit to ≤ ±0.2mm to avoid meshing jamming; Transmission chain (11) connection: wrap the transmission chain (11) around the large sprocket (10) and the small sprocket (12), install the tension wheel, and make the tension of the transmission chain meet the requirement of "droop ≤ 10mm / m"; use chain link pin to connect the transmission link port, and apply grease to the interface.

8. The construction method according to claim 7, characterized in that, The S3. Real-time monitoring and dynamic adjustment phase of the rotation operation includes: S31. Rotation Start A. Turn on the power; B. Formal Rotation: Start the rotation at the set speed, and assign monitoring personnel to be responsible for: 1) real-time monitoring of the rotation displacement with a total station; 2) monitoring of torque with a frequency converter control cabinet; 3) transmission chain tension. S32. Rotation Adjustment and Emergency Handling A. Fine-tuning of precision: If the rotation deviation is detected to be greater than ±1.5mm, the motor speed is fine-tuned through the frequency converter control cabinet. The deviation is gradually corrected by utilizing the meshing redundancy between the large sprocket (10) and the transmission chain (11) to ensure that the final positioning deviation is ≤±2mm. B. Emergency shutdown: If the torque exceeds the threshold or there is abnormal noise from the drive chain, the shutdown protection will be triggered immediately; check the cause, remove foreign objects or adjust the sprocket position, and then restart the rotation; C. Rotation and positioning: When the rotation angle is about to reach the required angle, the motor reducer (13) stops according to the set deceleration time, and the ring slide rail (6) is temporarily fixed to the bridge pier with steel profiles; the total station finally detects that the positioning deviation meets the relevant standard requirements, and the rotation operation is completed.

9. The construction method according to claim 8, characterized in that, The S4. disassembly and reuse stage specifically includes: S41. Component Disassembly A. Disassembly of the transmission system: First, remove the pin of the transmission chain (11) and take off the transmission chain (11); then remove the retaining ring and key at the end of the small sprocket (12) and remove the small sprocket (12); finally, loosen the fixing bolts of the motor reducer (13) and separate it from the fixing seat (14); B. Disassembly of the rotating support leg (8) and the large sprocket (10): Remove the splicing bolts and positioning pins of the segmented large sprocket (10), and lift the chain tooth unit off segment by segment; loosen the quick-release bolts of the rotating support leg (8), and remove the rotating support leg (8) and the slide plate (7). S42. Component Inspection and Reuse Preparation Reuse Inspection: Each disassembled component is inspected individually. Components meeting the following standards can be reused: 1) Large sprocket (10) chain tooth wear ≤ 0.8mm; 2) Rotating support leg (8) bolt holes without deformation; 3) Slide plate (7) surface without cracks, friction coefficient ≤ 0.1; 4) Motor reducer (13) torque feedback accuracy ≤ ±3%; Component maintenance: Clean, lubricate, and classify qualified components for storage, ready for direct use in the next project.

10. An application of a chain-type rotation drive device for bridge rotation, characterized in that: The chain-type bridge rotation drive device according to any one of claims 1-4 is suitable for rotating bridges with a rotation weight of 500-40000 tons.

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