A single cable rotary cable suspension bridge test device

Abstract

This invention discloses a test device for a single-cable slewing suspension bridge, comprising a suspension structure, a bridge tower structure, and an adjustable slewing anchor system. The suspension structure includes a main cable, a bridge deck, and suspenders connecting the main cable and the bridge deck. The bridge tower structure is used to anchor the main cable and independently adjust its tension and sag. The adjustable slewing anchor system includes: a slewing anchor; a slewing saddle assembly mounted on the slewing anchor, the slewing saddle assembly supporting modular replacement of single, double, and multiple saddles; and a steering angle adjustment unit and a alignment adjustment unit integrated into the slewing saddle assembly. The main cable completes the slewing through the slewing saddle assembly, the steering angle adjustment unit adjusts the steering angle of the main cable, and the alignment adjustment unit adjusts the spatial path of the main cable. This invention aims to solve the technical problem of the lack of an effective test device in the prior art that can simulate the changes in slewing saddle parameters to study the stress performance of a single-tower, single-cable suspension bridge.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering testing technology, specifically to a single-cable rotating suspension bridge testing device. Background Technology

[0002] A suspension bridge is a bridge structure where the main cable is the primary load-bearing component. The load is transferred from the bridge deck to the main tower and anchorage structure through a suspension system composed of the main cable and suspenders. This type of bridge has advantages such as lightweight structure, large span, and aesthetically pleasing design, making it particularly suitable for crossing complex terrains such as rivers, canyons, and straits. However, the stress system of a single-tower, single-cable suspension bridge is unique. The main cable of this type of bridge is arranged in a "U" shape and needs to turn multiple times at the tower top and the turning anchor on the opposite bank. An unreasonable design of the turning saddle can lead to uneven stress on the main cable, localized stress concentration at the tower top, or abnormal structural vibration response, thus affecting the safety and durability of the bridge. Therefore, a systematic study of the impact of changes in the turning saddle parameters on the static and dynamic performance of a single-tower, single-cable suspension bridge is of significant engineering importance.

[0003] Currently, research on single-tower, single-cable suspension bridges mainly relies on computational analysis, lacking effective physical experimental verification methods. Existing suspension bridge model test devices are mostly designed for traditional double-cable structures, unable to simulate the special situation of the main cable rotating and being stressed in space, and also difficult to controllably adjust the number, angle, or position of the cable saddles. This lack of a targeted model test platform leads to discrepancies between theoretical calculations and actual stress conditions.

[0004] Therefore, there is an urgent need to provide a performance testing model for a single-tower, single-cable suspension bridge to simulate the stress and alignment changes of the main cable under different design conditions. This would allow for a direct and accurate reflection of the stress characteristics of a single-tower, single-cable suspension bridge under various working conditions, providing experimental support and theoretical basis for the design optimization and safety assessment of this new type of bridge. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a test device for a single-cable rotating cable suspension bridge, thereby solving the technical problem of the lack of an effective test device in the prior art that can simulate the changes in the parameters of the rotating cable saddle to study the stress performance of a single-tower, single-cable suspension bridge.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This invention provides a test device for a single-cable slewing suspension bridge, comprising: a suspension structure including a main cable, a bridge deck, and suspenders connecting the main cable and the bridge deck; a bridge tower structure for anchoring the main cable and independently adjusting its tension and sag; and an adjustable slewing anchor system including: a slewing anchor; a slewing saddle assembly disposed on the slewing anchor, the slewing saddle assembly supporting modular replacement of single saddles, double saddles, and multiple saddles; and a steering angle adjustment unit and a alignment adjustment unit integrated into the slewing saddle assembly; wherein the main cable completes the slewing through the slewing saddle assembly, the steering angle adjustment unit adjusts the steering angle of the main cable, and the alignment adjustment unit adjusts the spatial path of the main cable.

[0007] In some embodiments, the cable saddle assembly includes a detachable single saddle module, a double saddle module, and a multi-saddle module, wherein the multi-saddle module includes a main saddle and at least two displaceable auxiliary saddles.

[0008] In some embodiments, the steering angle adjustment unit includes a plurality of adjustment plates disposed between the main saddle and the slewing anchor, and the steering angle is adjusted by increasing or decreasing the number of layers of the adjustment plates.

[0009] In some embodiments, the steering angle adjustment unit further includes a fastener for connecting the stacked adjustment plates, or the adjustment plates to the slewing anchor.

[0010] In some embodiments, the steering angle adjustment unit includes a telescopic assembly disposed between the main saddle and the slewing anchor, the telescopic assembly adjusting the steering angle by driving the main saddle to move up and down in a direction perpendicular to the mounting plane.

[0011] In some embodiments, the telescopic assembly includes a guide and a telescopic member, the guide being vertically fixed to the outer periphery of the slewing anchor, and the telescopic member driving the main saddle to rise and fall along the guide.

[0012] In some embodiments, the alignment adjustment unit includes a slide rail mechanism disposed tangentially along the slewing anchor, and the auxiliary saddle adjusts the alignment by displacement along the slide rail mechanism.

[0013] In some embodiments, the slide rail mechanism includes a slide rail, a slider, and a locking assembly. The slide rail is fixed to the rotary anchor, the slider and the auxiliary saddle are fixed and slidably connected to the slide rail, and the locking assembly is used to lock the position of the slider.

[0014] In some embodiments, the bridge tower structure includes a drive member connected to the anchor end of the main cable for applying tension and adjusting the cable profile and sag; the suspension structure also includes a cable force sensor and a sag monitoring unit, both of which are disposed in the main cable for detecting the cable force and sag of the main cable.

[0015] In some embodiments, the suspension structure further includes a distributed loading module disposed on the bridge deck for simulating static or dynamic loads.

[0016] Compared with existing technologies, the present invention provides a test device for a single-cable slewing suspension bridge. By setting up an independently adjustable bridge tower structure, modular and replaceable slewing saddle components, and an adjustable saddle slewing anchor system with dual adjustment functions for angle and alignment, it achieves precise control of the main cable tension, turning angle, and alignment. It can flexibly simulate the stress state under different numbers, arrangements, and turning paths of slewing saddles. This device not only visually demonstrates the stress law and bridge deck deformation characteristics of the main cable during spatial turning, but also provides experimental data support for cable force distribution and structural response under different working conditions. Therefore, this application significantly improves the operability and realism of experimental research, fills the technical gap of lacking effective physical testing methods for single-tower, single-cable suspension bridges, and provides a scientific basis for the design optimization and safety assessment of this type of bridge. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a single-cable rotating cable suspension bridge test device provided in an embodiment of this application; Figure 2 This is a schematic diagram of a single saddle module provided in an embodiment of this application; Figure 3 This is a schematic diagram of a dual-saddle module provided in an embodiment of this application; Figure 4 This is a schematic diagram of a multi-saddle module provided in an embodiment of this application; Figure 5 This is a schematic diagram of a steering angle adjustment unit provided in an embodiment of this application; Figure 6 This is a cross-sectional view of an adjustment plate structure provided in an embodiment of this application; Figure 7 This is a schematic diagram of another steering angle adjustment unit provided in an embodiment of this application; Figure 8 This is a schematic diagram of a linear adjustment unit structure provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 10. Suspension structure; 11. Main cable; 12. Bridge deck; 13. Suspension cable; 14. Cable force sensor; 15. Sag monitoring unit; 16. Loading module; 20. Bridge tower structure; 21. Drive unit; 30. Adjustable saddle slewing anchor system; 31. Slewing anchor; 32. Saddle assembly; 321. Single saddle module; 322. Double saddle module; 323. Multi-saddle module; 3231. Main saddle; 3232. Secondary saddle; 33. Steering angle adjustment unit; 331. Adjustment plate; 332. Fastener; 333. Telescopic assembly; 3331. Guide component; 3332. Telescopic component; 34. Linear adjustment unit; 341. Slide rail mechanism; 3411. Slide rail; 3412. Slider; 3413. Locking assembly. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] To address the technical problem of the lack of an effective test device in the existing technology that can simulate the changes in the parameters of the cable saddle to study the stress performance of a single-tower, single-cable suspension bridge, this invention provides a test device for a single-cable saddle suspension bridge. This device can simulate the stress and alignment changes of a single-tower, single-cable suspension bridge under different parameter variations, thus providing reliable test data for the study of this bridge type.

[0021] It should be noted that the single-cable rotating cable suspension bridge test device described in this invention is used for, but not limited to, bridge engineering tests. For ease of explanation, this invention will only use the application of the single-cable rotating cable suspension bridge test device in bridge engineering tests as an example. The principle of the single-cable rotating cable suspension bridge test device in other types of equipment is essentially the same as that in bridge engineering tests, and will not be elaborated here.

[0022] Please see Figure 1 , Figure 1 This is a schematic diagram of a test device for a single-cable rotating suspension bridge according to one embodiment of this application. The test device includes a suspension structure 10, a bridge tower structure 20, and an adjustable cable saddle rotating anchor system 30, which can simulate the stress characteristics and parameter variation of a single-tower, single-cable suspension bridge at the model scale.

[0023] The suspension structure 10 includes a main cable 11, a bridge deck 12, and several suspenders 13 connecting the main cable 11 and the bridge deck 12. The main cable 11 is composed of high-strength steel wire bundles and is the main load-bearing component of the bridge. One end of each suspender 13 is connected to the main cable 11, and the other end is connected to the bridge deck 12 structure to transfer the load of the bridge deck 12. The bridge deck 12 is a stiffened beam structure made of lightweight materials and is suspended below the main cable 11 by the suspenders 13 so that the deformation and distribution characteristics of the bridge deck 12 under load can be reflected.

[0024] The bridge tower structure 20 supports and anchors the main cable 11, and also has the function of independently adjusting the tension and sag of the main cable 11. The bridge tower adopts a rigid triangular frame structure, which is fixed to the base with bolts to ensure overall stability. The top of the bridge tower is provided with a through hole for the main cable 11 to guide the main cable 11 through and connect to the anchoring end. In order to realize the cable force adjustment under different working conditions, the bottom of the bridge tower is equipped with a cable force adjustment device, which includes jacks and anchoring clamps, and can apply different tension forces to the main cable 11 to precisely control the alignment and stress state of the main cable 11.

[0025] An adjustable slewing saddle anchor system 30 is installed at the slewing end of the main cable 11, including a slewing anchor 31, a slewing saddle assembly 32 mounted on the slewing anchor 31, and a steering angle adjustment unit 33 and a line adjustment unit 34 integrated into the slewing saddle assembly 32. The slewing saddle assembly 32 adopts a modular design, supporting rapid replacement of single, double, and multi-saddle configurations to simulate the stress changes of the main cable 11 under different slewing cycles. The main cable 11 is wound around the slewing saddle assembly 32, achieving a spatial rotation path from the vertical plane to the horizontal plane and back to the vertical plane.

[0026] The steering angle adjustment unit 33 is used to control the steering angle of the main cable 11 at the slewing anchor 31. This is typically achieved by changing the longitudinal position of the cable saddle relative to the slewing anchor 31, thus enabling precise adjustment of the main cable 11's steering angle. The alignment adjustment unit 34 is used to adjust the spatial alignment changes of the main cable 11 during slewing. This is typically achieved through a sliding mechanism that allows for slight tangential displacement of the cable saddle, thereby changing the relative position between the cable saddles and thus correcting the overall slewing path and alignment of the main cable 11.

[0027] In this embodiment, through the synergistic effect of the suspension structure 10, the bridge tower structure 20, and the adjustable saddle slewing anchor system 30, the number, angle, and position of the saddles of the single-tower single-cable suspension bridge can be adjusted. The stress distribution of the main cable 11, the deflection of the bridge deck 12, and the cable force variation under different parameter combinations can be tested and recorded, thereby obtaining the stress characteristics and structural response of the single-tower single-cable suspension bridge under different design conditions, providing reliable experimental basis for engineering design.

[0028] In one embodiment, please refer to Figures 2 to 4 , Figure 2 This is a schematic diagram of a single saddle module 321 provided in an embodiment of this application. Figure 3 This is a schematic diagram of a dual-saddle module 322 provided in an embodiment of this application. Figure 4 This is a schematic diagram of a multi-saddle module 323 provided in an embodiment of this application. The cable saddle assembly 32 includes a detachable single-saddle module 321, a double-saddle module 322, and a multi-saddle module 323. Each module adopts a modular assembly structure, which can be flexibly replaced according to test requirements to simulate the stress changes of the main cable 11 under different rotations.

[0029] The single-saddle module 321 simulates the stress state of the main cable 11 under a single turning condition; the double-saddle module 322, through the series arrangement of two cable saddles, is used to study the changes in the mechanical properties of the main cable 11 after two turns; the multi-saddle module 323 consists of a main saddle 3231 and at least two displaceable auxiliary saddles 3232. The main saddle 3231 is centrally located and is used to realize the main turning function of the main cable 11. The displaceable auxiliary saddles 3232 are symmetrically or asymmetrically arranged on both sides of the main saddle 3231 and can be moved slightly in the tangential or radial direction to adjust the alignment and stress path of the main cable 11 in the turning region. The multi-saddle module 323 can not only reproduce complex turning stress conditions, but also realize the adjustment of the relative position and angle between different cable saddles, thereby expanding the simulation capability of the test device for the effects of multi-parameter coupling.

[0030] In some optimized embodiments, please refer to Figure 5 , Figure 5 This is a schematic diagram of a steering angle adjustment unit 33 provided in an embodiment of this application. The steering angle adjustment unit 33 includes multiple adjustment plates 331 disposed between the main saddle 3231 and the slewing anchor 31. The adjustment plates 331 are preferably made of high-strength steel or aluminum alloy to ensure sufficient rigidity and stability under stress. The adjustment plates 331 are installed in parallel stacks between the connection interface of the main saddle 3231 and the slewing anchor 31.

[0031] During the experiment, the longitudinal distance between the main saddle 3231 and the slewing anchor 31 was changed by adding or removing the number of adjusting plates 331 or replacing them with adjusting plates 331 of different thicknesses, thereby precisely adjusting the turning angle of the main cable 11 at the slewing anchor 31. When the number of adjusting plates 331 is increased, the overall position of the main saddle 3231 moves forward, and the turning angle of the main cable 11 increases accordingly; conversely, when the number of adjusting plates 331 or the thickness is reduced, the position of the main saddle 3231 moves backward, and the turning angle of the main cable 11 decreases. This adjustment method can achieve flexible switching between multiple angle working conditions without changing the main structure of the device, significantly improving the repeatability and scalability of the test device.

[0032] In addition, anti-slip pads or positioning pads can be installed between the adjusting plates 331 to reduce assembly gaps and prevent minor displacements during loading, ensuring that the main cable 11 maintains a stable turning angle. This structure not only enables adjustment of the turning angle but also provides reliable experimental evidence for analyzing the mechanical properties of a single-tower, single-cable suspension bridge under complex stress conditions by observing and comparing the stress, cable force distribution, and linear changes of the main cable 11 under different angle parameters.

[0033] Further, please refer to Figure 6 , Figure 6This is a cross-sectional view of an adjusting plate 331 provided in an embodiment of this application. In some optimized embodiments, the steering angle adjusting unit 33 further includes a fastener 332, which is used to connect the stacked adjusting plates 331 or to fix the adjusting plates 331 to the slewing anchor 31. The fastener 332 may include components such as bolts, nuts, and washers, and may also adopt a pin or a clamping connection structure to adapt to different installation methods and testing requirements.

[0034] In one implementation, fasteners 332 penetrate the mounting holes of each layer of adjusting plates 331 and the rotary anchor 31. By tightening nuts or locking nuts, a tightly fitted, integral force-bearing surface is formed between the adjusting plates 331, ensuring that the adjusting plates 331 do not slip relative to each other during loading. To improve the safety and reliability of the connection, positioning holes or limiting bosses can be provided on the contact surfaces of the adjusting plates 331 and the rotary anchor 31, forming a double constraint with the fasteners 332, thereby preventing angular errors caused by slight offsets when the main cable 11 is under stress.

[0035] Furthermore, the fastener 332 can be detachable, facilitating quick replacement or adjustment of the number of adjusting plates 331 at different test stages. When the steering angle needs to be changed, the operator only needs to loosen the fastener 332, add, remove, or replace the adjusting plates 331, and then tighten them again, without disassembling other components, significantly improving assembly efficiency and angle adjustment accuracy. In some embodiments, to prevent loosening under high loads, the bolts can be used with anti-loosening washers, double nuts, or constant torque fastening devices.

[0036] In this embodiment, by setting fastener 332, the steering angle adjustment unit 33 maintains a simple structure while possessing the characteristics of high strength, high stability and repeatable assembly, which not only ensures adjustment accuracy but also enhances the reliability and safety of the entire test system under multiple loading.

[0037] Additionally, please refer to Figure 7 , Figure 7 This is a schematic diagram of another steering angle adjustment unit 33 provided in an embodiment of this application. Figure 7 The Z-direction shown is perpendicular to the mounting plane. In some optimized embodiments, the steering angle adjustment unit 33 includes a telescopic assembly 333 disposed between the main saddle 3231 and the slewing anchor 31. This telescopic assembly 333 can achieve continuous adjustable control of the steering angle by driving the main saddle 3231 to rise and fall in a direction perpendicular to the mounting plane without disassembling the main saddle 3231 or the adjusting plate 331, thereby improving adjustment accuracy and operating efficiency.

[0038] The telescopic component 333 is preferably a controllable mechanical drive structure, specifically in the form of a screw lifting mechanism, a hydraulic cylinder, or an electric push rod. The screw lifting mechanism drives the nut seat up and down by rotating the screw, thereby driving the main saddle 3231 to rise and fall in a direction perpendicular to the mounting plane. The hydraulic cylinder or electric push rod structure achieves linear telescopic movement through hydraulic or electric drive, offering advantages such as fast response speed and high control precision. The lower end of the telescopic component 333 is fixed to the main body of the rotary anchor 31, and the upper end is rigidly connected to the bottom of the main saddle 3231 or hinged through a connecting seat, ensuring that the main saddle 3231 maintains stable posture and moves in a predetermined direction during lifting and lowering.

[0039] To improve the controllability and safety of adjustment, the telescopic assembly 333 can be equipped with limit switches and displacement sensors to monitor the lifting displacement and steering angle changes of the main saddle 3231 in real time. When the main saddle 3231 rises, the steering angle of the main cable 11 at the turning point increases accordingly; when the main saddle 3231 falls, the steering angle decreases, thereby achieving precise control of the spatial path of the main cable 11, suitable for repeated tests with multiple sets of angle parameters.

[0040] In this embodiment, by introducing the telescopic component 333, the experimenter can quickly complete the angle adjustment without disassembling the adjustment plate 331, significantly improving the efficiency and repeatability of the experiment. This structure makes the steering angle adjustment process smoother and more controllable, and avoids structural wear caused by frequent disassembly and assembly, thereby improving the durability and experimental stability of the entire device.

[0041] Furthermore, in some embodiments, the telescopic assembly 333 may specifically include a guide member 3331 and a telescopic member 3332. The guide member 3331 is vertically fixed to the outer periphery of the slewing anchor 31, i.e., perpendicular to the mounting plane, and is used to define the movement trajectory of the main saddle 3231 and maintain its posture stability during the lifting and lowering process; the telescopic member 3332 is disposed adjacent to or arranged along the guide member 3331, and is used to drive the main saddle 3231 to achieve precise lifting and lowering movement along the direction of the guide member 3331, thereby realizing continuous adjustment of the steering angle of the main cable 11.

[0042] The upper surface of the guide member 3331 is preferably precision machined or coated to reduce friction and improve guiding accuracy. Its lower end is fixed to the slewing anchor 31 by welding or bolting to prevent lateral displacement or rotational deviation of the main saddle 3231 during lifting. The guide member 3331 can be configured as a single member or a symmetrically distributed double guide structure to further enhance the stability and balance of the lifting movement of the main saddle 3231.

[0043] The telescopic component 3332 can employ a screw drive mechanism, a hydraulic cylinder, or an electric push rod structure. Its drive end is connected to the bottom of the main saddle 3231, and its extension or retraction movement drives the main saddle 3231 to smoothly rise and fall along the direction of the guide component 3331. In some embodiments, the stroke of the telescopic component 3332 can be controlled by adjusting a limit nut or a limit switch. Simultaneously, a sliding sleeve or linear bearing structure can be provided between the guide component 3331 and the main saddle 3231 to reduce frictional resistance and ensure smooth movement.

[0044] In this embodiment, during use, when the telescopic member 3332 extends, the main saddle 3231 is pushed to a higher position, and the turning angle of the main cable 11 at the turning point increases; conversely, when the telescopic member 3332 retracts, the main saddle 3231 moves downward, and the turning angle of the main cable 11 decreases. Through the coordinated action of the guide member 3331 and the telescopic member 3332, the main saddle 3231 can achieve stable and precise vertical displacement under controlled conditions, effectively avoiding off-center loading and torsion.

[0045] In one embodiment, please refer to Figure 8 , Figure 8 This is a schematic diagram of a linear adjustment unit 34 provided in an embodiment of this application. The linear adjustment unit 34 includes a slide rail mechanism 341 arranged tangentially along the rotary anchor 31. The auxiliary saddle 3232 adjusts the linearity of the main cable 11 by displacement along the slide rail mechanism 341. The slide rail mechanism 341 is preferably located at the outer edge of the rotary anchor 31 and arranged tangentially along the main cable 11 to limit the movement trajectory of the auxiliary saddle 3232 and ensure its stability and accuracy during the adjustment process. The slide rail mechanism 341 can be in the form of a linear guide rail, an arc-shaped slide groove, or a roller sliding structure.

[0046] The auxiliary saddle 3232 is slidably connected to the slide rail mechanism 341 to ensure smooth movement along the tangential direction. During actual adjustment, the auxiliary saddle 3232 can be moved back and forth along the slide rail mechanism 341 by screw adjustment, sliding block 3412 pushing, or electric drive. When the auxiliary saddle 3232 moves outward, the radius of curvature of the main cable 11 at the turning point increases, and the cable profile becomes smoother; when the auxiliary saddle 3232 moves inward closer to the main saddle 3231, the radius of curvature of the main cable 11 decreases, and the cable profile becomes more compact. By precisely controlling the displacement of the auxiliary saddle 3232, the cable profile of the main cable 11 can be continuously adjusted, thereby simulating the stress state under different cable saddle layouts.

[0047] Furthermore, the slide rail mechanism 341 can be equipped with a locking device or a limiting structure to fix the position of the auxiliary saddle 3232 after adjustment, preventing displacement under loading or vibration conditions. In some optimized embodiments, the slide rail 3411 can also be equipped with a scale or displacement sensor to record the correspondence between the positional change of the auxiliary saddle 3232 and the alignment of the main cable 11 in real time, thereby achieving quantitative acquisition of test data. Through the combination of the slide rail mechanism 341 and the movable auxiliary saddle 3232, the test device can intuitively and accurately reproduce the alignment change law of the main cable 11 in the turning region, providing a reliable physical basis for analyzing the influence of the cable saddle parameters on the overall bridge stress performance.

[0048] Furthermore, in some embodiments, the slide rail mechanism 341 may specifically include a slide rail 3411, a slider 3412, and a locking assembly 3413. The slide rail 3411 is arranged along the tangential direction of the slewing anchor 31 and is fixed to the outer edge of the slewing anchor 31 by bolts or welding, providing a smooth and precise sliding path for the auxiliary saddle 3232. Depending on the test requirements, the slide rail 3411 may be arranged in a straight line or an arc to accommodate different slewing radii and alignment adjustment requirements of the main cable 11.

[0049] The slider 3412 is fixedly connected to the bottom of the auxiliary saddle 3232, forming a slidable connection with the slide rail 3411. The slider 3412 can adopt various structural forms such as a groove, roller, or linear bearing to ensure smooth movement and precise positioning of the auxiliary saddle 3232 on the slide rail 3411. To prevent wobbling or skew during sliding, a limiting flange or guide groove structure is provided between the slider 3412 and the slide rail 3411, giving it single-degree-of-freedom movement characteristics in the tangential direction. During adjustment, the slider 3412 can be moved along the slide rail 3411 by manual knob, lead screw drive, or electric push rod, achieving precise fine-tuning of the auxiliary saddle 3232's position.

[0050] The locking component 3413 is used to fix the position of the slider 3412 after adjustment. The locking component 3413 can be a mechanical locking bolt, a pressure plate buckle, or a quick-clamping mechanism. When the locking component 3413 is tightened or clamped, a reliable frictional force or engagement force is formed between the slider 3412 and the slide rail 3411 to prevent displacement under loading or vibration conditions. In some embodiments, the locking component 3413 may also be used in conjunction with an anti-loosening washer or a spring structure to maintain a stable locking effect under long-term loading.

[0051] In one embodiment, please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a single-cable rotating suspension bridge test device provided in an embodiment of this application. The bridge tower structure 20 includes a drive component 21, and the suspension structure 10 also includes a cable force sensor 14 and a sag monitoring unit 15, which are used to realize the tension control and stress state monitoring of the main cable 11.

[0052] The drive unit 21 is located at the anchoring end of the bridge tower structure 20 and connected to the end of the main cable 11. By actively applying or releasing tension, it precisely controls the cable force state of the main cable 11 and its sag change at mid-span, thereby adjusting the overall alignment of the main cable 11 and enabling the device to simulate stress conditions under different loading conditions. The drive unit 21 can be in the form of a mechanical jack, hydraulic cylinder, or electric push-pull mechanism, etc. Its output end is connected to the anchoring clamp of the main cable 11, and the tension and slack of the main cable 11 are adjusted by applying axial tension.

[0053] A cable force sensor 14 is installed in the main cable 11 to continuously collect cable force change data during tensioning and loading. The cable force sensor 14 can be a tension / compression sensor or a strain gauge sensor unit; its output signal is proportional to the tension of the main cable 11, and accurate cable force data can be obtained through a signal acquisition system. Simultaneously, a sag monitoring unit 15 in the main cable 11 is used to detect the vertical displacement of the main cable 11 at mid-span or other critical locations to assess whether the cable's alignment and stress distribution are reasonable. The sag monitoring unit 15 can be a laser rangefinder, displacement sensor, or visual measurement system to monitor the vertical displacement of the main cable 11 at mid-span or critical locations in real time. The cable force sensor 14 and the sag monitoring unit 15 can be linked with the data acquisition system to achieve real-time recording and feedback of cable force and sag, assisting test personnel in making precise adjustments.

[0054] In this embodiment, not only can the initial tension and load state of the main cable 11 be flexibly adjusted through the driving component 21, but it also has the ability to monitor the force response and deformation behavior of the main cable 11 in real time, thereby providing a reliable data foundation for the mechanical performance study and parameter optimization of the suspension bridge model.

[0055] In one embodiment, the suspension structure 10 also includes a distributed loading module 16 disposed on the bridge deck 12 for simulating static or dynamic loads, thereby reproducing the stress distribution and deformation characteristics of the actual bridge under different working conditions.

[0056] The distributed loading module 16 can be arranged uniformly or segmentally along the longitudinal direction of the bridge deck 12, and the position and number of loading points can be flexibly configured according to the test requirements. The loading module 16 can take the form of counterweights, hydraulic loading cylinders or electric servo loading devices, etc., to apply controllable vertical forces and realize the simulation of different types of load conditions.

[0057] In static load tests, the loading module 16 can simulate the dead load and uniformly distributed load of the bridge deck 12 by arranging several counterweights at different positions on the bridge deck 12 or applying constant pressure, which facilitates the analysis of the stress law and deflection change of the main cable 11, suspension cable 13 and stiffening girder under constant stress conditions. In dynamic load tests, the loading components can be periodically driven to move up and down to simulate dynamic effects such as vehicle driving, wind vibration or bridge deck 12 vibration, thereby studying the vibration response and cable force fluctuation characteristics of the suspension system under alternating loads.

[0058] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A test device for a single-cable rotating suspension bridge, characterized in that, include: The suspension structure includes a main cable, a bridge deck, and slings connecting the main cable and the bridge deck; The bridge tower structure is used to anchor the main cable and independently adjust its tension and sag. Adjustable cable saddle slewing anchor system includes: Slewing anchor; The slewing saddle assembly is installed on the slewing anchor, and the slewing saddle assembly supports modular replacement of single saddles, double saddles and multiple saddles; The steering angle adjustment unit and the line adjustment unit are integrated into the cable saddle assembly; The main cable completes rotation through the saddle assembly, the steering angle adjustment unit adjusts the steering angle of the main cable, and the alignment adjustment unit adjusts the spatial path of the main cable.

2. The single-cable rotating suspension bridge test device according to claim 1, characterized in that, The cable saddle assembly includes a detachable single saddle module, a double saddle module, and a multi-saddle module. The multi-saddle module includes a main saddle and at least two displaceable auxiliary saddles.

3. The single-cable rotating suspension bridge test device according to claim 2, characterized in that, The steering angle adjustment unit includes multiple adjustment plates disposed between the main saddle and the slewing anchor. The steering angle is adjusted by increasing or decreasing the number of layers of the adjustment plates.

4. The single-cable rotating suspension bridge test device according to claim 3, characterized in that, The steering angle adjustment unit also includes fasteners for connecting the stacked adjustment plates, or the adjustment plates to the slewing anchor.

5. The single-cable rotating suspension bridge test device according to claim 2, characterized in that, The steering angle adjustment unit includes a telescopic component disposed between the main saddle and the slewing anchor. The telescopic component adjusts the steering angle by driving the main saddle to rise and fall in a direction perpendicular to the mounting plane.

6. The single-cable rotating suspension bridge test device according to claim 5, characterized in that, The telescopic assembly includes a guide and a telescopic component. The guide is vertically fixed to the outer periphery of the slewing anchor, and the telescopic component drives the main saddle to rise and fall along the guide.

7. The single-cable rotating suspension bridge test device according to claim 2, characterized in that, The alignment adjustment unit includes a slide rail mechanism arranged tangentially along the rotary anchor, and the auxiliary saddle adjusts the alignment by displacing along the slide rail mechanism.

8. The single-cable rotating suspension bridge test device according to claim 7, characterized in that, The slide rail mechanism includes a slide rail, a slider, and a locking assembly. The slide rail is fixed to the rotary anchor, the slider and the auxiliary saddle are fixed and slidably connected to the slide rail, and the locking assembly is used to lock the position of the slider.

9. The single-cable rotating suspension bridge test apparatus according to any one of claims 1 to 8, characterized in that, The bridge tower structure includes a driving component connected to the anchoring end of the main cable, used to apply tension and adjust the shape and sag of the main cable; The suspension structure also includes a cable force sensor and a sag monitoring unit. Both the cable force sensor and the sag monitoring unit are installed in the main cable and are used to detect the cable force and sag of the main cable.

10. The single-cable rotating suspension bridge test apparatus according to any one of claims 1 to 8, characterized in that, The suspension structure also includes a distributed loading module disposed on the bridge deck for simulating static or dynamic loads.

Images