Self-locking control device for 2500m-level suspension bridge, bracket system and bracket self-locking method

Abstract

The invention provides a self-locking control device for a 2500m-level suspension bridge, a bracket system and a bracket self-locking method, and belongs to the technical field of suspension bridge catwalk construction.The self-locking control device for the 2500m-level suspension bridge comprises a positioning assembly, a magnetic control self-locking mechanism and a microprocessor, the positioning assembly is used for collecting position data of a locked device of a suspension bridge catwalk in real time, and the magnetic control self-locking mechanism is used for receiving the position data of the locked device of the suspension bridge catwalk; the collected position data is transmitted to the microprocessor; the magnetic control self-locking mechanism is used for receiving a control signal of the microprocessor and carrying out magnetic control self-locking or unlocking on a locked device of the suspension bridge catwalk; and the microprocessor is used for receiving the position data of the positioning assembly, generating a self-locking control signal and controlling the magnetic control self-locking mechanism to complete self-locking. The triangular structure of the three-dimensional frame is combined with the two sets of rollers on the single side to clamp the upper side and the lower side of the bracket bearing cable, a double-wheel limiting structure is formed, the wind resistance stability and the bearing capacity are greatly improved, and the problem that an existing plane bracket is prone to shifting or the gravity center is unstable is solved.

Description

Technical fields: This invention belongs to the field of construction technology of catwalk for suspension bridges, specifically relating to a self-locking control device and bracket system and bracket self-locking method for a 2500m suspension bridge. Background technology: The catwalk of a suspension bridge serves as a temporary work platform for main cable erection and cable clamp installation, with its core load-bearing structure being the catwalk's load-bearing cable. Chinese Patent CN 221460943 U discloses a bracket structure for installing the load-bearing cable of a suspension bridge catwalk bracket. It includes a main frame, with a fixed seat installed on one side of the main frame. The fixed seat is welded to the main frame and has an H-shaped structure. A support shaft is installed on the upper part of the fixed seat, and rollers are connected to the outside of the support shaft. The rollers are connected to bearings on the support shaft, and baffles are symmetrically installed on the outside of the rollers. Friction patterns are provided on the outer wall of the rollers, located between the baffles, and are transverse. This type of structure is currently a common form of catwalk bracket for suspension bridges. Its advantages include relatively simple structure and suitability for small-to-medium span suspension bridges with small distances between main and auxiliary towers and relatively stable load-bearing cable stress. In this type of bridge, the load-bearing cable is reliably anchored at both ends, and is less affected by wind loads. Although there is a certain risk of tipping over or center of gravity shift when the bracket moves along the load-bearing cable,...

[0001] However, for super-large suspension bridges with a main span of ≥2500m, the existing bracket structures and their construction methods have revealed significant shortcomings in terms of applicability and reliability, mainly in the following aspects: I. Problem of Excessive Sagging of Load-Bearing Cables: During the initial traction phase, the ends of the load-bearing cables are not stably anchored, making them prone to significant sagging due to their own weight. According to the "Inland Waterway Navigation Standards" and the "Technical Specifications for Highway Bridge and Culvert Construction," the waterway clearance during construction must be ≥60m. Therefore, the sagging of the load-bearing cables must be strictly controlled. This places extremely high demands on the stability and wind resistance of the support system suspended on the load-bearing cables, requiring stringent control over its stability and resistance to wind vibration.

[0002] II. Insufficient Stability of Traditional Traction Brackets: Existing traction brackets are mostly planar frame structures welded from steel pipes, with limited overall rigidity and spatial stability, making them unsuitable for the high loads and complex wind-induced vibration environments borne by the cables of ultra-long-span suspension bridges. Under strong winds, they are prone to swaying or even instability, severely affecting the bracket's accuracy and fixation on the cables. Particularly regarding the bracket's own stability, existing structures have weak anti-overturning capabilities when moving along large-arc, long-span cables, lacking a center-of-gravity adjustment mechanism, making them highly susceptible to displacement or even overturning due to uneven stress distribution.

[0003] III. Low Construction Efficiency: Traditional bracket erection requires pulling the bracket's load-bearing cable using a traction device, then connecting each bracket with positioning ropes, and finally adjusting the bracket's position by pulling the positioning ropes—this process involves numerous ropes that are prone to tangling and knotting, not only prolonging the installation time of individual brackets but also severely impacting overall construction efficiency. In the bracket locking and fixing process, existing technologies mostly rely on friction grooves and baffles for simple limiting, lacking an efficient and reliable rigid locking mechanism. This makes the brackets prone to slippage under wind loads or construction disturbances, failing to meet the stringent positional accuracy requirements of large-span catwalks.

[0004] Therefore, in order to solve the above problems, there is an urgent need for a traction bracket system that combines high stability, precise positioning and locking to meet the comprehensive requirements of safety, precision and efficiency in the construction of the catwalk of a 2500m-class super-large span suspension bridge. Summary of the Invention

[0005] To address the problems of poor stability and low construction efficiency in existing technologies, this invention provides a self-locking control device for a 2500m suspension bridge, along with a bracket system and a bracket self-locking method.

[0006] This invention mainly utilizes a magnetic self-locking mechanism of "electric adsorption-electric locking" to magnetically control and fix the brackets suspended on the load-bearing cables of the suspension bridge through magnetic attraction. It also uses positioning components for real-time positioning to ensure that the installation spacing of multiple bracket systems is within a preset range. This ensures that the bracket system on the load-bearing cables has good installation stability and uniform distribution, and improves the overall wind resistance and load-bearing capacity.

[0007] The technical solution adopted in this invention is: A self-locking control device for a 2500m suspension bridge includes a positioning component, a magnetic self-locking mechanism, and a microprocessor. The positioning component is used to collect the position data of the locking device of the catwalk of the suspension bridge in real time and transmit the collected position data to the microprocessor. The magnetic self-locking mechanism is used to receive control signals from the microprocessor and to magnetically lock or unlock the locking device of the catwalk of the suspension bridge. The microprocessor is used to receive position data from the positioning component and, according to... Determine the moving distance D of the locked device real According to the distance D real Distance D from the preset distance set When comparing, |D real D set When |≤0.03m, a self-locking control signal is sent to the magnetic self-locking mechanism to control it to complete the self-locking process; In the formula, a is a coefficient, b is a constant, and the values ​​of a and b can be obtained from the suspension bridge main cable setting drawings. x0 is the initial horizontal coordinate of the locking device, x1 is the horizontal coordinate of the real-time position of the locking device, and x is the position data of the positioning component.

[0008] Furthermore, the positioning component is a GNSS positioning device used to monitor the horizontal and vertical coordinates of the locked device and transmit them to the microprocessor.

[0009] Further specifying, the magnetically controlled self-locking mechanism includes at least a locking block, a wedge-shaped clamp, and an electromagnetic control module. The wedge-shaped clamp is disposed within the locking block and can slide within the locking block. The electromagnetic control module is disposed within the locking block and forms an electromagnetic force on the wedge-shaped clamp to control the wedge-shaped clamp to engage, self-lock, or unlock.

[0010] Further specified, the wedge-shaped clip includes an upper clip and a lower clip embedded in the lock block, the wedge angle of the upper clip and the lower clip is not less than 30°, and the sliding distance within the lock block does not exceed 0.5cm.

[0011] Furthermore, the upper and lower clamping plates are provided with concave and convex biting teeth on their opposing biting surfaces, which are locked together by biting each other.

[0012] The present invention also provides a catwalk traction bracket system suitable for 2500m class suspension bridges, which includes a control platform, bracket, drive unit, roller assembly and the aforementioned self-locking control device for 2500m class suspension bridges. A roller assembly is mounted on a bracket and includes cable-bearing rollers and lifting rollers. The lifting rollers are multiple and are suspended on the load-bearing cables of the 2500m-class suspension bridge, and are symmetrically arranged on the top of the bracket. The cable-bearing rollers are located at the bottom of the bracket and are arranged on the symmetrical center line of the multiple lifting rollers. The cable-bearing rollers and the lifting rollers are triangularly distributed vertically. The drive unit provides power for the movement of the bracket; The 2500m suspension bridge uses a self-locking control device, symmetrically arranged on the top of the bracket, to perform real-time positioning of the bracket on the load-bearing cable and to adjust the position according to the movement distance D. real Distance D from the preset distance set By comparing and determining the power supply status, the magnitude of the electromagnetic force is adjusted to determine the self-locking or unlocking state of the bracket on the load-bearing cable. The control platform communicates with the self-locking control device used in the 2500m suspension bridge, receives positioning and unlocking information, and controls the drive unit to drive the bracket to move along the load-bearing cable.

[0013] Furthermore, the roller assembly is arranged symmetrically front to back and left to right, so that the brackets are evenly distributed on the load-bearing cable.

[0014] The present invention also provides a self-locking method for the traction bracket of the catwalk of a 2500m-class suspension bridge, which includes the following steps: S1. On the construction platform at the top of the main tower of the suspension bridge, the catwalk traction bracket system for 2500m class suspension bridges as described in the claim is hoisted onto the load-bearing cable, and the magnetic self-locking control device of the suspension bridge catwalk is activated to make the bracket in the unlocked state on the load-bearing cable under the action of electromagnetic force. S2. After receiving the positioning and unlocking information from the self-locking control device for the 2500m suspension bridge, the control platform controls the drive unit to drive the bracket to slide along the load-bearing cable. During the movement, the magnetic self-locking control device of the suspension bridge catwalk monitors the position of the bracket in real time and adjusts accordingly. Determine the travel distance D of the bracket real And based on the moving distance D real Distance D from the preset distance set When comparing, |D real D set When |≤0.03m, the magnetic self-locking control device of the suspension bridge catwalk sends a self-locking control signal to complete the self-locking, locking the bracket tightly onto the load-bearing cable, and the drive unit stops working.

[0015] Further specifying, step S2 includes: S2.1 The microprocessor determines the design curve equation of the load-bearing cable according to the suspension bridge design drawings and determines parameters a and b. It also marks the starting point of the load-bearing cable at the top of the main tower as the starting point of the bracket. The GNSS positioning device collects the starting coordinates of the bracket and calculates the preset position of each bracket with the main tower as the starting point through the main cable alignment. S2.2 The control platform communicates with the self-locking control device of the 2500m suspension bridge. After receiving positioning and unlocking information, the control drive unit drives the bracket to slide along the load-bearing cable. During the movement, the GNSS positioning device monitors the horizontal coordinate x of the bracket. i and vertical coordinate y i And transmit it to the microprocessor; S2.3 The microprocessor uses numerical integration to calculate the distance traveled along the cable from the initial position to the real-time position. : S2.4, the microprocessor according to |D real D set If |≤0.03m, the bracket is judged to have moved to the preset position; S2.5, After confirming that the bracket has moved to the preset position |D real D setIf |≤0.03m, a self-locking control signal is sent to the magnetic self-locking mechanism; otherwise, return to step S2.2. S2.6 After receiving the self-locking control signal, the magnetic self-locking mechanism cuts off the power signal to perform magnetic self-locking on the bracket.

[0016] Further specifying, step S2.6 specifically includes: S2.6.1 After receiving the self-locking control signal from the microprocessor, the electromagnetic control module of the magnetic self-locking mechanism cuts off the power, the electromagnetic force disappears, the wedge clip disengages from the locking block and slides downward along the inclined direction of the load-bearing cable within the locking block under its own weight. S2.6.2 During the sliding process, as the wedge angle of the wedge-shaped clip increases, the sliding distance gradually decreases until the wedge-shaped clip and the surface of the load-bearing cable are in contact to form a wedge-shaped interlocking structure. The bracket is locked by the interlocking teeth of the concave and convex parts, thus completing the magnetic self-locking of the bracket on the load-bearing cable.

[0017] Compared with the prior art, the beneficial effects of the present invention are: (1) The catwalk traction bracket system for 2500m suspension bridges provided by the present invention is mainly designed by “three-dimensional frame + intelligent positioning and self-locking”. By adjusting the bracket structure, the triangular structure of the three-dimensional frame is combined with two sets of rollers on one side to clamp the upper and lower sides of the bracket load-bearing cable, forming a “double wheel limit” structure, which greatly improves wind resistance stability and load-bearing capacity, avoids the problem of easy deviation or instability of the center of gravity of the existing planar bracket, and significantly improves wind resistance stability, load-bearing capacity and force uniformity. Furthermore, it uses a self-locking control device for 2500m suspension bridges to achieve precise positioning and efficient self-locking, which is especially suitable for the construction scenario of 2500m super-large span suspension bridges that cross navigation channels.

[0018] (2) The self-locking control device for 2500m suspension bridges of the present invention uses positioning components to collect and locate the movement position of the bracket suspended on the load-bearing cable of the suspension bridge in real time, and replaces the positioning rope marking in the existing construction, avoiding the problem of easy tangling of the rope when the positioning rope is erected, and ensuring accurate positioning and improving construction efficiency. After positioning, the data is transmitted to the microprocessor. The microprocessor uses numerical integration method to accurately calculate the position and movement distance of the bracket on the curved load-bearing cable, and controls the magnetic self-locking mechanism to magnetically lock or unlock the bracket, ensuring the fastening effect and ensuring the stability of the center of gravity of the entire bracket system on the load-bearing cable. It can adapt to the locking and fixing of outdoor load-bearing cable construction environment such as rain and strong wind.

[0019] (3) The suspension bridge catwalk traction bracket self-locking method of the present invention uses the original data of the design drawing as the basis for positioning judgment, and makes full use of the GNSS positioning device for real-time positioning. It uses the numerical integration method to calculate the distance of movement along the cable and compares it with the preset value to determine whether the bracket system has reached the designated position. Furthermore, it uses the magnetic self-locking mechanism to lock and tighten in time, which can achieve high-precision positioning and high-standard locking, avoid the problem of rope entanglement, reduce the number of operators, and effectively prevent the bracket system from tilting due to the shift of the center of gravity. It can adapt to outdoor construction environments such as rain and strong winds, and is especially suitable for inland and coastal super-large span suspension bridge projects. Attached Figure Description

[0020] Figure 1 A schematic diagram of the self-locking control device for a 2500m suspension bridge; Figure 2 for Figure 1 A schematic diagram of the GNSS positioning device structure; Figure 3 This is a schematic diagram of the catwalk load-bearing bracket system.

[0021] Figure 4 This is a front view of the catwalk load-bearing bracket structure.

[0022] Figure 5 This is a side view of the catwalk load-bearing bracket structure.

[0023] Figure 6 This is a schematic diagram of the electric drive device.

[0024] Figure 7 This is a schematic diagram of the internal structure of the electric drive device.

[0025] In the diagram: 1-Bracket; 2-Roller assembly; 21-Cable-carrying roller; 22-Lifting roller; 3-GNSS positioning device; 4-Magnetic self-locking mechanism; 41-Locking block; 42-Wedge clamp; 421-Upper clamp; 422-Lower clamp; 43-Eating teeth; 44-Electromagnetic control module; 5-Microprocessor; 6-Drive unit; 61-Battery; 62-Driver; 63-Signal receiver; 64-Housing; 7-Control platform. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] This invention provides a self-locking control device, bracket system, and bracket self-locking method for a 2500m suspension bridge, which will be described below with reference to embodiments.

[0032] Example 1 See Figure 1 and 2 This embodiment provides a self-locking control device for a 2500m-class suspension bridge, specifically including a positioning component, a magnetic self-locking mechanism 4, and a microprocessor 5; specifically, The positioning component is used to collect real-time location data of the locking device of the suspension bridge catwalk and transmit the collected location data to the microprocessor 5. In this embodiment, the positioning component is a GNSS positioning device 3; the GNSS positioning device 3 is a Beidou + GPS dual-frequency positioning module with an integrated design and a positioning accuracy of ≤±5cm. It can transmit the longitude, latitude, and elevation data of the bracket system in real time. In this embodiment, it is used to monitor the horizontal and vertical coordinates of the locking device and transmit them to the microprocessor 5 (response delay ≤0.5s).

[0033] The magnetic self-locking mechanism 4 receives control signals from the microprocessor 5 and performs magnetic self-locking or unlocking of the locking device of the suspension bridge catwalk. In this embodiment, the magnetic self-locking mechanism 4 includes at least a locking block 41, a wedge-shaped clamp 42, and an electromagnetic control module 44. The locking block 41 provides an installation space and enclosure for other components of the magnetic self-locking mechanism 4, such as the wedge-shaped clamp 42 and the electromagnetic control module 44. Its exterior is waterproof to prevent rainwater and dust from affecting the operation of the electromagnetic control module 44, thus adapting to outdoor construction environments. Furthermore, to reduce the weight of the locking block 41 and decrease wind resistance, its outer surface, either top or entirely, is machined into an arc-shaped curved structure. A circular hole is provided at the center of gravity of the locking block 41 for threading the load-bearing cable. A wedge-shaped recess is provided around the outer periphery of the circular hole to encapsulate the wedge-shaped clip 42. The length and diameter of the wedge-shaped recess are slightly larger than the wedge-shaped clip 42 to ensure that the wedge-shaped clip 42 can slide in the wedge-shaped recess under the action of gravity after the power is off, but the sliding distance does not exceed 0.5cm.

[0034] Furthermore, the electromagnetic control module 44 in this embodiment is also located within the lock block 41. It adopts an expandable integrated design, integrating a PLC control module, a battery module, and an electromagnetic lock block, and providing an expansion network port and serial port. The PLC control module of this module can be a commercially available mature control product such as the Huichuan PLC Easy series or the CoDeSys safety control series. It is powered by a battery module and controls the on / off state of the electromagnetic lock block through the PLC control module. The core working principle of the electromagnetic lock block is "electric attraction - de-energization engagement". It also adopts a common electromagnetic lock structure, and drives the wedge-shaped clamp 42 to perform engagement self-locking or unlocking actions through the on / off control of electromagnetic force.

[0035] Furthermore, the wedge-shaped clamp 42 in this embodiment includes an upper clamp 421 and a lower clamp 422 fitted into a wedge-shaped recess. The wedge angle of both the upper clamp 421 and the lower clamp 422 is not less than 30°. Concave and convex engagement teeth 43 are provided on the opposing engagement surfaces of the upper clamp 421 and the lower clamp 422, allowing for locking through the engagement of the teeth 43. Furthermore, to accommodate the locking of the load-bearing cable, the engagement surfaces of the upper clamp 421 and the lower clamp 422 along their length are machined into concave structures that match the outer surface of the load-bearing cable. The structure of these engagement surfaces can be adaptively adjusted for use in other locking environments. Furthermore, for optimal locking performance, the diameter of the load-bearing cable in this embodiment is 52 mm, the concave diameter of the upper clamp 421 and the lower clamp 422 is 56 mm, and the diameter of the wedge-shaped recess in the locking block 41 is 2-5 mm larger than the outer surface diameter of the upper clamp 421 and the lower clamp 422.

[0036] When powered on: the electromagnetic control module 44 generates magnetic attraction force, which attracts the upper wedge-shaped clip 421 and the lower wedge-shaped clip 422 to the inner wall of the wedge-shaped concave channel, thereby separating the upper wedge-shaped clip 421 and the lower wedge-shaped clip 422 from the surface of the load-bearing cable. When the power is off: After the power supply to the electromagnetic control module 44 is cut off, the magnetic attraction disappears. The wedge-shaped upper clamp 421 and lower clamp 422 slide down along the load-bearing cable under their own gravity, forming a wedge-shaped engagement with the surface of the load-bearing cable. However, due to the wedge-shaped structure design of the wedge-shaped concave channel, the wedge-tightening effect of the upper clamp 421 and lower clamp 422 becomes better as they slide down, and the greater the engagement force of the upper clamp 421 and lower clamp 422 on the load-bearing cable. With the engagement of the concave and convex engagement teeth 43 on the engagement surfaces of the upper clamp 421 and lower clamp 422, the locking effect is ensured to be better.

[0037] Microprocessor 5 is used to receive the position information from GNSS positioning device 3 and, according to... Determine the moving distance D of the locked device real In the formula, 'a' is a coefficient, 'b' is a constant, and the values ​​of 'a' and 'b' can be obtained from the main cable layout drawings of the suspension bridge. 'x0' is the initial horizontal coordinate of the locking device, 'x1' is the horizontal coordinate of the device's real-time position, and 'x' is the position data of the positioning component. Based on the moving distance D... real Distance D from the preset distance set When comparing, |D real D set When |≤0.03m, a self-locking control signal is sent to the magnetic self-locking mechanism 4 to control the magnetic self-locking mechanism 4 to complete the self-locking; the self-locking control device for 2500m-class suspension bridges of the present invention is suitable for the construction environment of the catwalk after the main cable of a 2500m-class super-large span suspension bridge is erected, ensuring good locking effect and high positioning accuracy.

[0038] Example 2 This embodiment provides a catwalk traction bracket system suitable for 2500m-class suspension bridges. It utilizes the self-locking control device for 2500m-class suspension bridges described in Embodiment 1 above for positioning and locking. In addition, it includes a bracket 1, a roller assembly 2, a control platform 7, and a drive unit 6. (See also...) Figure 3-7 .

[0039] In this embodiment, the control platform 7 communicates with the self-locking control device for 2500m suspension bridges, receives positioning information and unlocking information, and controls the drive unit 6 to drive the bracket 1 to move along the load-bearing cable.

[0040] The bracket 1 in this embodiment is a spatial bracket 1 composed of transverse beams, longitudinal beams and diagonal support rods. Compared with the traditional planar bracket 1, the bracket 1 in this embodiment is a three-dimensional frame with a two-way, two-channel distribution, which significantly improves wind resistance stability, load-bearing capacity and stress uniformity.

[0041] Furthermore, a roller assembly 2 is fixed on the bracket 1. The roller assembly 2 includes at least two cable-bearing rollers 21 and four lifting rollers 22. In this embodiment, the four lifting rollers 22 are distributed in pairs on the left and right sides and are suspended on the load-bearing cable of the 2500m-class suspension bridge to ensure that the entire bracket 1 is suspended on the load-bearing cable. Specifically, the two ends of the rollers are fixed to the two sides of the top of the bracket 1 using roller seats. The load-bearing cable passes under the rollers and is held in place by the rollers, so that the rollers and the load-bearing cable make arc-shaped contact, and the rollers are suspended on the load-bearing cable. The two cable-bearing rollers 21 are arranged front and back along the length of the load-bearing cable at the bottom of the bracket 1 and are arranged on the symmetrical center line of the multiple lifting rollers 22. The cable-bearing rollers 21 arranged on the front side and the corresponding lifting rollers 22 on both sides form a vertically triangular wheel group and are distributed on the same plane perpendicular to the load-bearing cable. Correspondingly, the cable-bearing rollers 21 arranged on the rear side and the corresponding hoisting rollers 22 on both sides form a vertically triangular wheel group, which is distributed on the same plane perpendicular to the load-bearing cable. The two wheel groups at the front and rear are clamped on the load-bearing cable on both sides, and the hoisting rollers 22 and the cable-bearing rollers 21 are distributed vertically to form a "double wheel limiting" structure, which is symmetrical front and rear and left and right, to ensure that the bracket 1 is evenly distributed on the load-bearing cable, and together with the three-dimensional bracket 1, they form the bracket 1 frame.

[0042] Furthermore, there are two drive units 6, symmetrically arranged on both sides of the bracket 1. Each unit comprises a battery 61, a drive motor 62, a signal receiver 63, and a housing 64, all encapsulated within the housing 64. The output shaft of the drive motor 62 is connected to the axle of the front lifting roller 22 of the roller assembly 2, driving the front lifting roller 22 to rotate along the load-bearing cable, thereby sliding on the cable and ensuring the bracket 1 slides down as a whole. To further improve efficiency, the drive motor 62 can be a pure electric motor, a generator, or a hybrid system, depending on the construction environment and the availability of the battery 61 or hydraulic tank. This technology is relatively mature, and the choice can be made directly based on the construction environment and drive requirements. In this embodiment, the driving speed is controlled in stages. Within 200m of the main tower, the driving speed is no more than 20m / min. Beyond 200m, the driving speed reaches 25-40m / min. Within 100m of the preset position, the driving speed is reduced to no more than 15m / min. The signal receiver 63 controls the control signal of the control platform 7 in real time. After the bracket 1 exceeds the predetermined position, the position can be adjusted by the drive motor 62.

[0043] In this embodiment, two self-locking control devices for the 2500m suspension bridge are used. As described in Embodiment 1, they are inserted through round holes into the load-bearing cables and symmetrically arranged on the two load-bearing cables at the top of the bracket 1. To ensure stable sliding of the bracket 1 on the load-bearing cables without deviation, the preferred installation position of the self-locking control devices for the 2500m suspension bridge is between the two hoisting rollers 22, so that the self-locking control devices on both sides are symmetrically distributed and the bracket 1 is self-locked and fixed. The self-locking control devices for the 2500m suspension bridge are used to locate the position of the bracket 1 on the load-bearing cables in real time and adjust the position according to the movement distance D. real Distance D from the preset distance set By comparing the power supply status, the magnitude of the electromagnetic force is adjusted to further determine the self-locking or unlocking state of bracket 1 on the load-bearing cable.

[0044] Example 3 This embodiment also provides a self-locking method for the catwalk traction bracket of a 2500m-class suspension bridge, implemented using the catwalk traction bracket system for 2500m-class suspension bridges from Embodiment 2, as described below. Figure 6 The specific operation process is as follows: S1. On the construction platform at the top of the main tower of the suspension bridge, the above-mentioned catwalk traction bracket system suitable for 2500m class suspension bridges is hoisted onto the load-bearing cable. The four hoisting rollers 22 are correspondingly engaged with the load-bearing cable. The power supply of the magnetic self-locking control device of the suspension bridge catwalk is activated to generate electromagnetic force. Under the action of electromagnetic force, the upper clamp 421 and the lower clamp 422 of the wedge-shaped clamp 42 are respectively attracted to the inner wall of the wedge-shaped concave channel, so that the upper clamp 421 and the lower clamp 422 are separated from the surface of the load-bearing cable. The bracket 1 is in the unlocked state on the load-bearing cable and can slide.

[0045] S2. After receiving the positioning and unlocking information from the self-locking control device for the 2500m suspension bridge, the control platform 7 controls the drive unit 6 to drive the bracket 1 to slide along the load-bearing cable. During the movement, the magnetic self-locking control device of the suspension bridge catwalk monitors the position of the bracket 1 in real time and adjusts it accordingly. Determine the moving distance D of bracket 1 real And based on the moving distance D real Distance D from the preset distance set When comparing, |D real D set When |≤0.03m, the magnetic self-locking control device of the suspension bridge catwalk sends a self-locking control signal to complete the self-locking and lock the bracket 1 on the load-bearing cable.

[0046] Specifically, step S2 is achieved by the following steps: S2.1 Microprocessor 5 determines the design curve equation of the load-bearing cable according to the suspension bridge design drawings and determines parameters a and b. It also marks the starting point of the load-bearing cable at the top of the main tower as the starting point of bracket 1. GNSS positioning device 3 collects the starting coordinates (x0, y0) of bracket 1 and calculates the preset position of each bracket 1 with the main tower as the starting point through the main cable alignment. This invention utilizes the quadratic parabolic equation that can be derived from the lowest point of the mid-span of the main cable (i.e., the load-bearing cable of the suspension bridge) to calculate the positional change along the main cable using the principle of calculus, based on the difference in the horizontal position ΔX of the suspension bridge. This allows for the calculation of the actual movement distance of bracket 1 along the main cable curve, overcoming the limitation of GNSS positioning which can only locate in the horizontal direction. This achieves precise control of the spacing between the load-bearing cables. The main cable alignment of a suspension bridge conforms to a quadratic equation (parabolic shape, simplified to standard form): y=ax 2 +bx in: x: Horizontal coordinate of the main cable (along the bridge axis, unit: m); y: Vertical elevation coordinates of the main cable (unit: m); a, b: Main cable alignment design parameters (determined by the span, sag-to-span ratio, etc. of the suspension bridge, which can be obtained from the construction drawings); a is a coefficient, b is a constant, and b can be zero.

[0047] Based on the above suspension bridge's main cable alignment, the equation is a quadratic equation: y=ax 2 +b, differentiating with respect to x, gives Substituting into the arc length formula, we get Based on this, the actual displacement of bracket 1 can be calculated.

[0048] Table 1 defines the key parameters. Microprocessor 5 obtains the quadratic equation parameters a and b of the main cable of the current section from the suspension bridge design drawings; it places bracket 1 at the starting position (such as the starting point of the main cable at the top of the main tower) for initial position calibration; then it starts the GNSS positioning device 3 and records the initial coordinates (x0, y0); and inputs the preset distance D of bracket 1 into microprocessor 5. set .

[0049] S2.2 The control platform 7 communicates with the self-locking control device of the 2500m suspension bridge. After receiving positioning and unlocking information, the control drive unit 6 drives the bracket 1 to slide along the load-bearing cable. During the movement, the GNSS positioning device 3 monitors the horizontal coordinate x of the bracket 1. i and vertical coordinate y i And transmit it to microprocessor 5; S2.3, Microprocessor 5 uses numerical integration to calculate the distance from the initial position (x0, y0) to the real-time position (x... i y i The distance traveled along the cable : S2.4, Microprocessor 5 according to |D real D set If |≤0.03m, determine that bracket 1 has moved to the preset position; S2.5 After determining that bracket 1 has moved to the preset position, further determine the current distance of bracket 1 moving along the cable. When |D real D set If |≤0.03m, a self-locking control signal is sent to the magnetic self-locking mechanism 4; otherwise, return to step S2.2. S2.6 After receiving the self-locking control signal, the magnetic self-locking mechanism 4 cuts off the power signal to perform magnetic self-locking on the bracket 1, specifically as follows: S2.6.1 After receiving the self-locking control signal from the microprocessor 5, the electromagnetic control module 44 of the magnetic self-locking mechanism 4 cuts off the power, the electromagnetic force disappears, the wedge-shaped clamp 42 disengages from the locking block 41 and slides downward in the inclined direction of the load-bearing cable within the locking block 41 under its own weight. S2.6.2 During the sliding process, as the wedge angle of the wedge-shaped clip 42 increases, the sliding distance gradually decreases until the wedge-shaped clip 42 and the surface of the load-bearing cable are attached to form a wedge-shaped interlocking structure, and the bracket 1 is locked by the upper and lower interlocking teeth 43 through the interlocking of the concave and convex parts, thus completing the magnetic self-locking of the bracket 1 on the load-bearing cable.

[0050] Repeat the above steps to install all bracket systems sequentially according to the required spacing for the working conditions, ultimately forming a continuous catwalk cable support system. It should also be noted that, in actual construction, the bracket systems should be installed sequentially from both the left and right sides of the suspension bridge.

[0051] Example 4 In this embodiment, the positioning component of the self-locking control device for the 2500m suspension bridge is equipped with a gyroscope sensor to detect the tilt angle. Specifically, the positioning component in this embodiment includes a GNSS positioning device 3 and a gyroscope sensor. The GNSS positioning device 3 uses a Beidou + GPS dual-frequency positioning module with an integrated design, achieving a positioning accuracy of ≤±5cm. It can transmit the longitude, latitude, and elevation data of the bracket system in real time. In this embodiment, it is used to monitor the horizontal and vertical coordinates of the locked device and transmit them to the microprocessor 5 (response delay ≤0.5s). The gyroscope sensor is used to monitor the tangential tilt angle θ of the locked device in real time and transmit it to the microprocessor 5.

[0052] The derivative of the quadratic equation of the main cable is the tangent slope (y′=2ax+b), and the tangent slope is directly related to the "tangent angle" detected by the gyroscope (k=tanθ). By capturing the changes in the tangent angle in real time with the gyroscope, the position coordinates of bracket 1 on the main cable curve can be derived in reverse, verifying the linearity of the main cable curve, and thus ensuring that bracket 1 does not deflect or tilt during its movement.

[0053] Therefore, based on the self-locking method of the above embodiment three, step a can also be included between step S2.2 and step S2.3: the collected real-time data is processed according to the tangent slope k. i =tanθ i =2ax i +b (deviation ≤ ±0.01) verifies the linearity of the main cable curve to ensure that bracket 1 always moves along the main cable curve without the risk of cable detachment. Other steps are the same as in Example 3.

[0054] The self-locking control device, bracket system, and bracket self-locking method for 2500m-class suspension bridges of this invention improve the overall wind resistance stability, load-bearing capacity, and stress uniformity of the bracket system, thereby ensuring that the sag of the catenary load-bearing cable is controllable during traction, within the standard requirement of a channel clearance of ≥60m, and with good locking effect, ensuring accurate positioning and good locking effect. It is particularly useful for inland and coastal super-large span suspension bridge projects in outdoor environments such as rainy and windy conditions, significantly improving construction efficiency and construction safety.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A self-locking control device for a 2500m suspension bridge, characterized in that, It includes a positioning component, a magnetic self-locking mechanism (4), and a microprocessor (5); The positioning component is used to collect the position data of the locking device of the catwalk of the suspension bridge in real time and transmit the collected position data to the microprocessor (5). The magnetic self-locking mechanism (4) is used to receive the control signal from the microprocessor (5) and to magnetically lock or unlock the locking device of the suspension bridge catwalk. The microprocessor (5) is used to receive the position data of the positioning component and, according to... Determine the moving distance D of the locked device real According to the distance D real Distance D from the preset distance set When comparing, |D real D set When |≤0.03m, a self-locking control signal is sent to the magnetic self-locking mechanism (4) to control the magnetic self-locking mechanism (4) to complete the self-locking; In the formula, a is a coefficient, b is a constant, and the values ​​of a and b are obtained from the main cable setting drawings of the suspension bridge. x0 is the initial horizontal coordinate of the locking device, x1 is the horizontal coordinate of the real-time position of the locking device, and x is the position data of the positioning component.

2. The self-locking control device for a 2500m suspension bridge according to claim 1, characterized in that, The positioning component uses a GNSS positioning device (3) to monitor the horizontal and vertical coordinates of the locked device and transmit them to the microprocessor (5).

3. The self-locking control device for a 2500m suspension bridge according to claim 1, characterized in that, The magnetic self-locking mechanism (4) includes at least a locking block (41), a wedge-shaped clamp (42), and an electromagnetic control module (44). The wedge-shaped clamp (42) is disposed inside the locking block (41) and can slide inside the locking block (41). The electromagnetic control module (44) is disposed inside the locking block (41) and forms an electromagnetic force on the wedge-shaped clamp (42) to control the wedge-shaped clamp (42) to engage and self-lock or unlock.

4. The self-locking control device for a 2500m suspension bridge according to claim 3, characterized in that, The wedge-shaped clip (42) includes an upper clip (421) and a lower clip (422) embedded in the lock block (41). The wedge angle of the upper clip (421) and the lower clip (422) is not less than 30°, and the sliding distance within the lock block (41) does not exceed 0.5cm.

5. The self-locking control device for a 2500m suspension bridge according to claim 4, characterized in that, The upper clip (421) and the lower clip (422) are provided with concave and convex biting teeth (43) on their respective biting surfaces, and are locked together by biting teeth (43) biting each other.

6. A traction bracket system for a catwalk of a 2500m-class suspension bridge, characterized in that, It includes a control platform (7), a bracket (1), a drive unit (6), a roller assembly (2), and a self-locking control device for a 2500m suspension bridge as described in any one of claims 1 to 5; Roller assembly (2) is set on bracket (1), and roller assembly (2) includes cable-bearing roller (21) and lifting roller (22). The lifting roller (22) consists of multiple rollers that are lifted on the load-bearing cables of the 2500m suspension bridge and are symmetrically arranged on the top of bracket (1). The cable-bearing roller (21) is set at the bottom of bracket (1). The cable-bearing roller (21) is arranged on the symmetrical center line of multiple lifting rollers (22), and the cable-bearing roller (21) and the lifting roller (22) are triangularly distributed vertically. Drive unit (6) is used to provide power for the movement of bracket (1); The 2500m suspension bridge uses a self-locking control device, which is symmetrically arranged on the top of the bracket (1) to perform real-time positioning of the bracket (1) on the load-bearing cable and to determine the position of the bracket (1) according to the moving distance D. real Distance D from the preset distance set By comparing and judging the power on / off status, the magnitude of the electromagnetic force is adjusted to determine the self-locking or unlocking state of the bracket (1) on the load-bearing cable; The control platform (7) communicates with the self-locking control device for the 2500m suspension bridge, receives positioning information and unlocking information, and controls the drive unit (6) to drive the bracket (1) to move along the load-bearing cable.

7. The catwalk traction bracket system for 2500m-class suspension bridges according to claim 6, characterized in that, The roller assembly (2) is arranged symmetrically in front and behind and symmetrically in the left and right, so that the bracket (1) is evenly distributed on the load-bearing cable.

8. A self-locking method for the traction bracket of a catwalk on a 2500m-class suspension bridge, characterized in that... Includes the following steps: S1. On the construction platform at the top of the main tower of the suspension bridge, the catwalk traction bracket system of claim 7 applicable to the 2500m class suspension bridge is hoisted onto the load-bearing cable, and the magnetic self-locking control device of the suspension bridge catwalk is activated to make the bracket (1) in the unlocked state on the load-bearing cable under the action of electromagnetic force. S2. After receiving the positioning and unlocking information of the self-locking control device for the 2500m suspension bridge, the control platform (7) controls the drive unit (6) to drive the bracket (1) to slide along the load-bearing cable. During the movement, the magnetic self-locking control device of the suspension bridge catwalk monitors the position of the bracket (1) in real time and adjusts the position accordingly. Determine the moving distance D of bracket (1) real And based on the moving distance D real Distance D from the preset distance set When comparing, |D real D set When |≤0.03m, the magnetic self-locking control device of the suspension bridge catwalk sends a self-locking control signal to complete the self-locking and lock the bracket (1) on the load-bearing cable, and the drive unit (6) stops working.

9. The self-locking method for the traction bracket of the catwalk of a 2500m suspension bridge according to claim 8, characterized in that, Step S2 includes: S2.1, Microprocessor (5) determines the design curve equation of the load-bearing cable according to the suspension bridge design drawings and determines parameters a and b, and marks the starting point of the load-bearing cable at the top of the main tower as the starting point of the bracket (1). GNSS positioning device (3) collects the starting coordinates of the bracket (1) and calculates the preset position of each bracket (1) with the main tower as the starting point through the main cable alignment. S2.2 The control platform (7) communicates with the self-locking control device for the 2500m suspension bridge. After receiving the positioning and unlocking information, the control drive unit (6) drives the bracket (1) to slide along the load-bearing cable. During the movement, the GNSS positioning device (3) monitors the horizontal coordinate x of the bracket (1). i and vertical coordinate y i And transmit it to the microprocessor (5); S2.3, The microprocessor (5) uses numerical integration to calculate the distance traveled along the cable from the initial position to the real-time position. : S2.4, Microprocessor (5) according to |D real D set If |≤0.03m, the bracket (1) is moved to the preset position; S2.5, After confirming that the bracket (1) has moved to the preset position |D real D set If |≤0.03m, a self-locking control signal is sent to the magnetic self-locking mechanism (4); otherwise, return to step S2.

2. S2.6 After receiving the self-locking control signal, the magnetic self-locking mechanism (4) cuts off the power signal to perform magnetic self-locking on the bracket (1).

10. The self-locking method for the catwalk traction bracket of a 2500m-class suspension bridge according to claim 9, characterized in that, Step S2.6 specifically includes: S2.6.1 After receiving the self-locking control signal from the microprocessor (5), the electromagnetic control module (44) of the magnetic self-locking mechanism (4) cuts off the power, the electromagnetic force disappears, the wedge clip (42) disengages from the locking block (41) and slides down along the inclined direction of the load-bearing cable in the locking block (41) under its own weight. S2.6.2 During the sliding process, as the wedge angle of the wedge clip (42) increases, the sliding distance gradually decreases until the wedge clip (42) and the surface of the load-bearing cable are attached to form a wedge-shaped interlocking structure, and the bracket (1) is locked by the interlocking teeth (43) with concave and convex engagement, thus completing the magnetic self-locking of the bracket (1) on the load-bearing cable.

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