Suspension bridge main cable strand erecting method and system

Abstract

According to the suspension bridge main cable strand erecting method and system, systematized control over erecting of the suspension bridge main cable strand is achieved through the complete processes of cable strand restraining frame installation, double-reference cable strand traction, linear adjustment, stability observation and conventional cable strand erecting. Firstly, the cable strand restraining frames are installed at equal intervals to provide a uniform supporting foundation for the cable strands, it is ensured that loads are distributed reasonably, and the risk of local stress concentration is reduced; the symmetrical arrangement of the double-reference cable strands covers the lower half part area of the main cable, the installation freedom degree of the conventional cable strands is remarkably reduced by adding positioning reference objects, and deviation accumulation caused by insufficient single-reference positioning is avoided; in the stability observation link, the reference state is judged through a preset threshold value, environmental fluctuation interference is eliminated, the long-term reliability of the reference cable strand as a reference is guaranteed, and a solid foundation is laid for subsequent conventional cable strand erection.

Description

Technical Field

[0001] This invention belongs to the field of suspension bridge construction technology, specifically relating to a method and system for erecting the main cable strands of a suspension bridge. Background Technology

[0002] As the core load-bearing component of a suspension bridge, the positioning accuracy of its strands directly determines the overall stress balance and operational safety of the bridge. During suspension bridge construction, the main cable consists of multiple strands, with the reference strand serving as the first strand erected, providing a positioning benchmark for the other conventional strands.

[0003] In traditional main cable erection methods, positioning is generally achieved using only a single reference strand. However, as the span of suspension bridges continues to increase and the diameter of the main cable exceeds 1 meter, the positioning coverage of a single reference strand is limited and cannot effectively constrain the installation freedom of the lower half of the main cable strands. At the same time, existing technologies only use single-point monitoring for benchmarks and lack real-time monitoring methods for the internal stress of the reference strands. This makes it impossible to detect linear or stress fluctuations in the reference strands in a timely manner. As a result, during the main cable erection process, the erection deviation of conventional strands is prone to exceed the standard threshold, leading to safety hazards such as local stress concentration and subsequent creep deformation of the main cable. Summary of the Invention

[0004] In order to address the technical problem in the background art that during the main cable erection process, the erection deviation of conventional cable strands easily exceeds the standard threshold, causing safety hazards such as local stress concentration and subsequent creep deformation of the main cable, the present invention provides a method and system for erecting main cable strands of suspension bridges.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for erecting the main cable strands of a suspension bridge, comprising: S1: Install cable strand restraint frames: According to the main cable design parameters, fix multiple cable strand restraint frames on the catwalk so that the multiple cable strand restraint frames are installed at equal intervals on the catwalk; S2: Installation of reference strands: Pull two reference strands so that the two reference strands are installed sequentially on all the positioning frames and symmetrically arranged in the lower half of the main cable design section; the reference strands are equipped with fiber optic grating sensors for real-time monitoring of stress data of the reference strands; S3: Baseline Strand Linearity Adjustment: Linearity detection is performed on the two baseline strands respectively to obtain linearity data, and the linearity of the two baseline strands is adjusted based on the linearity data to bring them into the designed linearity conditions; S4: Stability observation of the reference cable strand: The stability of the reference cable strand is observed. During the stability observation process, the stress fluctuation of the reference cable strand is obtained through the fiber optic grating sensor, and the linear fluctuation of the reference cable strand is obtained through the total station. When both the linear fluctuation and the stress fluctuation are lower than the preset threshold, the reference cable strand is determined to be in a stable state, and step S5 is executed; otherwise, step S3 is executed again. S5: Conventional cable strand erection: Using two reference cables as a reference, conventional cables are erected by traction, and installed on all cable strand positioning frames. During the traction erection process, the positions of the two reference cables are periodically checked until the traction erection of all conventional cables is completed.

[0006] Optionally, step S1 includes: S1.1: Select the installation spacing between the cable strand support frames according to the design span of the main cable; S1.2: Based on the installation spacing between the cable support frames, the cable support frames are fixedly installed on the crossbeams at the bottom of the catwalk using bolts.

[0007] Optionally, step S2 includes: S2.1: Use winches to pull the reference cable strands on the rollers respectively, so that the two reference cable strands are pulled into place respectively; S2.2: Using the transverse winch on the catwalk, the two reference strands are lifted into the set positions on the steel channels of the corresponding strand positioning frame and symmetrically arranged in the lower half of the main cable design section. S2.3: Connect the two reference cable strands to the demodulator to complete the installation of the reference cable strands.

[0008] Optionally, in step S2.2, the specific method of symmetrically arranging the two reference strands is as follows: taking the center of the main cable section as the origin, a vertical central axis is established, and it is deflected 45 degrees to both sides to form a positioning extension line, so that the geometric center of the two reference strands coincides with the positioning extension line.

[0009] Optionally, step S3 includes: S3.1: Install reflective prisms at the positions corresponding to the feature points of the main cable on the two reference strands; the feature points of the main cable are located at 1 / 2 span, 1 / 4 span, 1 / 8 span and 1 / 16 span of the main cable, and the distance between adjacent feature points is no more than 200 meters. S3.2: Based on the reflective prisms on the two reference cable strands, use a total station to simultaneously collect the elevation of the feature points and the alignment of the reference cable strands; S3.3: Based on the collected feature point elevations and the baseline cable strand alignment, adjust the alignment of the two baseline cable strands to bring them into the designed alignment conditions.

[0010] Optionally, the stability observation of the benchmark cable strand in step S4 includes: S4.1: Select the number of days in the stability observation period, and acquire the stress fluctuation of the reference cable strand through the fiber optic grating sensor and the linear fluctuation of the reference cable strand through the total station in at least three time periods of each day in the observation period, and transmit the stress fluctuation and linear fluctuation of the reference cable strand to the central control module. S4.2: In the data processing module, the stress fluctuation and linear fluctuation of the reference cable strand are compared with preset thresholds to obtain the comparison results; the preset thresholds are linear fluctuation ≤ 1 mm and stress fluctuation ≤ 2 MPa. S4.3: If the comparison result shows that both linear fluctuation and stress fluctuation are below the preset threshold, then execute step S5; otherwise, re-execute step S3.

[0011] Optionally, in step S5, during the traction erection process, after every 10 conventional cable strands are erected, the positions of the two reference cable strands are rechecked, and the alignment and stress data are remeasured using a total station and demodulator, and the two reference cable strands are adjusted accordingly.

[0012] Secondly, the present invention provides a suspension bridge main cable strand erection system for realizing the suspension bridge main cable strand erection method described above, including a central control module, a display module, multiple strand positioning frames, a traction device, a total station, a demodulator, a reflective prism, two reference strands and multiple conventional strands; The cable support frame is fixed on the catwalk and is used to install the reference cable and regular cable; The traction device includes a winch and a roller, both of which are mounted on the catwalk. The winch and roller are used to traction the reference strand and the regular strand. The reference cable strand integrates a fiber optic grating sensor and is communicatively connected to the demodulator to monitor stress data inside the reference cable strand in real time and transmit it to the demodulator. The total station and reflecting prism are used to acquire the linear data of the reference cable strand; The central control module is communicatively connected to the display module, the demodulator, and the total station, and is used to acquire and compare the stress and alignment data of the reference cable strands.

[0013] Optionally, the cable support frame is assembled from steel components and has an internal steel channel structure for installing reference cables and conventional cables.

[0014] Optionally, the steel channel structure has anti-slip protrusions.

[0015] The beneficial effects of this invention are: This invention provides a method and system for erecting the main cable strands of a suspension bridge. Through a complete process including installing strand positioning frames, traction of dual-reference strands, alignment adjustment, stability monitoring, and conventional strand erection, it achieves systematic control over the erection of the main cable strands of a suspension bridge. First, the equidistant installation of the strand positioning frames provides a uniform support foundation for the strands, ensuring reasonable load distribution and reducing the risk of localized stress concentration. The symmetrical arrangement of the dual-reference strands covers the lower half of the main cable area. By adding positioning references, it significantly reduces the installation freedom of conventional strands and avoids the accumulation of deviations caused by insufficient positioning of a single reference. Second, the integrated fiber optic grating sensor enables real-time monitoring of stress data, allowing construction personnel to promptly capture changes in the internal forces of the reference strands. Combined with the alignment adjustment steps, this allows for rapid response to abnormal situations, improving proactive construction safety. The stability monitoring stage determines the reference state through preset thresholds, eliminating environmental fluctuation interference and ensuring the long-term reliability of the reference strands as a reference, laying a solid foundation for subsequent conventional strand erection. The entire method process in this invention not only improves the erection efficiency, but also reduces human intervention errors through closed-loop management, making it particularly suitable for the complex working conditions of long-span suspension bridges. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the method for erecting the main cable strands of a suspension bridge in this invention; Figure 2 This is a schematic diagram of the reference strand in the main cable design cross section in this invention; Figure 3 This is a schematic cross-sectional view of the reference strand in this invention; Figure 4 This is a schematic diagram of the traction reference cable strand in this invention; Figure 5 This is a schematic diagram of the main cable strand erection system for suspension bridges in this invention; Figure 6 This is a schematic diagram of the reference strand feature points in this invention; Figure 7 This is a schematic diagram of the adjustment of the reference strand shape in this invention. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] Example 1 See Figure 1 The diagram illustrates a method for erecting the main cable strands of a suspension bridge according to the present invention, including: S1: Install cable strand restraint frames: According to the main cable design parameters, fix multiple cable strand restraint frames on the catwalk so that the multiple cable strand restraint frames are installed at equal intervals on the catwalk; S2: Installation of reference strands: Pull two reference strands so that the two reference strands are installed sequentially on all the positioning frames and symmetrically arranged in the lower half of the main cable design section; the reference strands are equipped with fiber optic grating sensors for real-time monitoring of stress data of the reference strands; S3: Baseline cable strand alignment adjustment: Use a total station to perform linearity testing on the two baseline cables to obtain alignment data, and adjust the alignment of the two baseline cables based on the alignment data to bring them into the design alignment conditions; S4: Stability observation of the reference cable strand: The stability of the reference cable strand is observed. During the stability observation process, the stress fluctuation of the reference cable strand is obtained through the fiber optic grating sensor, and the linear fluctuation of the reference cable strand is obtained through the total station. When both the linear fluctuation and the stress fluctuation are lower than the preset threshold, the reference cable strand is determined to be in a stable state, and step S5 is executed; otherwise, step S3 is executed again. S5: Conventional cable strand erection: Using two reference cables as a reference, conventional cables are erected by traction, and installed on all cable strand positioning frames. During the traction erection process, the positions of the two reference cables are periodically checked until the traction erection of all conventional cables is completed.

[0023] This embodiment provides a method and system for erecting the main cable strands of a suspension bridge. Through a complete process including installing strand positioning frames, traction of dual-reference strands, alignment adjustment, stability monitoring, and conventional strand erection, the system achieves systematic control over the erection of the main cable strands of a suspension bridge. First, the equidistant installation of the strand positioning frames provides a uniform support foundation for the strands, ensuring reasonable load distribution and reducing the risk of localized stress concentration. The symmetrical arrangement of the dual-reference strands covers the lower half of the main cable area. By adding positioning references, the system significantly reduces the installation freedom of conventional strands, avoiding the accumulation of deviations due to insufficient positioning of a single reference. Second, the integrated fiber optic grating sensor enables real-time monitoring of stress data, allowing construction personnel to promptly capture changes in the internal forces of the reference strands. Combined with the alignment adjustment steps, this allows for rapid response to abnormal situations, improving proactive construction safety. The stability monitoring stage determines the reference state through preset thresholds, eliminating environmental fluctuation interference and ensuring the long-term reliability of the reference strands as a reference, laying a solid foundation for subsequent conventional strand erection. The entire process not only improves erection efficiency but also reduces human intervention errors through closed-loop management, making it particularly suitable for the complex working conditions of long-span suspension bridges.

[0024] Optionally, step S1 in this invention includes: S1.1: Select the installation spacing between the cable strand support frames according to the design span of the main cable; S1.2: Based on the installation spacing between the cable support frames, the cable support frames are fixedly installed on the crossbeams at the bottom of the catwalk using bolts.

[0025] In this embodiment, the spacing is selected according to the main cable design span to ensure that the cable strand positioning frame layout matches the actual load requirements of the bridge, avoiding cable strand sagging due to excessive spacing or resource waste due to insufficient spacing. The cable strand positioning frame is fixed to the bottom crossbeam of the catwalk with bolts, which enhances the rigidity of the overall connection, resists the influence of wind load and construction vibration, and prevents the cable strand positioning frame from shifting. This not only improves the accuracy of cable strand positioning but also simplifies the construction adjustment process. As a basic load-bearing unit, the reasonable arrangement of the cable strand positioning frame provides reliable guidance for subsequent cable strand traction and reduces the number of repeated corrections.

[0026] Optionally, step S2 in this invention includes: S2.1: Reference Figure 4 The two reference cable strands are pulled into place by winches on the rollers respectively. S2.2: Using the transverse winch on the catwalk, lift the two reference strands into the designated positions on the corresponding strand positioning frames, symmetrically arranging them in the lower half of the main cable's design cross-section, referring to... Figure 2 As shown; S2.3: Connect the two reference cable strands to the demodulator to complete the installation of the reference cable strands.

[0027] In this embodiment, the winch and roller are used in tandem to keep the traction speed stable within a reasonable range, avoiding surface damage or sudden changes in internal force caused by excessively rapid traction of the cable strands. The reference cable strands are lifted into the set position in the steel trough by the transverse winch, achieving precise positioning and reducing the risk of errors from manual handling. The design of symmetrically arranging the two reference cable strands in the lower half of the main cable's design cross-section, combined with the demodulator communication connection, enables the two reference cable strands to form a complementary reference system, covering a wider monitoring area and allowing for timely adjustment of the cable strand status through stress data feedback.

[0028] Optionally, refer to Figure 2 In step S2.2 of this invention, the specific method of symmetrical arrangement of the two reference strands is as follows: take the center of the main cable section as the origin, establish a vertical central axis, and deflect it 45 degrees to both sides to form a positioning extension line, so that the geometric center of the two reference strands coincides with the positioning extension line.

[0029] In this embodiment, a vertical axis is established with the center of the main cable cross-section as the origin, and a positioning extension line is formed by deflecting it 45 degrees to both sides, so that the geometric center of the reference strand coincides with the extension line. This arrangement makes full use of the symmetrical characteristics of the main cable cross-section, ensuring the balanced distribution of the two reference strands in space, reducing the risk of interference between strands, and optimizing the radial and circumferential installation accuracy of conventional strands through geometric constraints, avoiding uneven stress caused by asymmetrical arrangement. At the same time, this arrangement is easy for construction personnel to understand and implement. Furthermore, a special color coating can be applied to the reference strands, combined with a highly recognizable coating, to improve on-site operation efficiency.

[0030] Optionally, step S3 in this invention includes: S3.1: Reference Figure 6 and Figure 7 Reflective prisms are installed at the positions corresponding to the feature points of the main cable on the two reference strands; the feature points of the main cable are located at 1 / 2 span, 1 / 4 span, 1 / 8 span and 1 / 16 span of the main cable, and the distance between adjacent feature points is no more than 200 meters. S3.2: Based on the reflective prisms on the two reference cable strands, use a total station to simultaneously collect the elevation of the feature points and the alignment of the reference cable strands; S3.3: Based on the collected feature point elevations and the baseline cable strand alignment, adjust the alignment of the two baseline cable strands to bring them into the designed alignment conditions.

[0031] In this embodiment, reflective prisms are installed at key cable feature points (such as 1 / 2 span, 1 / 4 span, etc.) to cover critical stress areas, ensuring that the observation data fully represents the cable strand alignment. The design of a maximum spacing of 200 meters between adjacent feature points avoids monitoring blind spots. The use of a total station to simultaneously record elevation and alignment data reduces errors introduced by environmental factors. This multi-span observation method not only improves data reliability but also accelerates alignment adjustment through real-time comparison, providing a solid basis for stability assessment. It is particularly suitable for the long-term monitoring needs of long-span bridges.

[0032] Optionally, the stability observation of the benchmark strand in step S4 of the present invention includes: S4.1: Select the number of days in the stability observation period. During at least three time periods each day in the observation period, such as the morning, noon and evening, the stress fluctuation of the reference cable strand is obtained by the fiber optic grating sensor and the linear fluctuation of the reference cable strand is obtained by the total station. The stress fluctuation and linear fluctuation of the reference cable strand are then transmitted to the central control module. S4.2: In the data processing module, the stress fluctuation and linear fluctuation of the reference cable strand are compared with preset thresholds to obtain the comparison results; the preset thresholds are linear fluctuation ≤ 1 mm and stress fluctuation ≤ 2 MPa. S4.3: If the comparison result shows that both linear fluctuation and stress fluctuation are below the preset threshold, then execute step S5; otherwise, re-execute step S3.

[0033] In this embodiment, an observation period was selected and data was collected at multiple times each day to capture the changes in the benchmark cable strand under different environmental conditions, avoiding the randomness of a single observation. Stress fluctuations and linear fluctuations were compared with preset thresholds, and the central control module made automated judgments to trigger timely readjustment of the process, preventing small deviations from accumulating into major problems. This continuous monitoring mechanism not only improves construction safety but also reduces subjective misjudgments through data-driven decision-making, ensuring that the benchmark cable strand remains stable under long-term loads and providing a reliable reference for the entire main cable system.

[0034] Furthermore, in this embodiment, stress fluctuations of the reference cable strands are acquired by fiber optic grating sensors at least three time periods each day during the observation period, such as the morning, noon and evening periods, in order to check the thermal expansion and contraction of the reference cable strands. Therefore, the detection is carried out at least during the times of highest and lowest temperatures and the three periods of moderate temperature each day.

[0035] Optionally, in step S5 of the present invention, during the traction erection process, after every 10 conventional cable strands are erected, the positions of the two reference cable strands are rechecked, and the alignment and stress data are remeasured using a total station and demodulator, and the two reference cable strands are adjusted accordingly.

[0036] In this embodiment, the reference cable strand is re-inspected after every 10 conventional cable strands are erected to promptly correct reference offsets caused by subsequent construction and avoid error propagation. The total station and demodulator are used to re-measure, and combined with the symmetry of the dual reference cable strands, local problems are quickly identified and adjusted. This periodic re-inspection mechanism forms a closed-loop quality control, reduces the risk of full rework, and improves overall construction efficiency, demonstrating long-term advantages, especially in large bridge projects.

[0037] Example 2 Secondly, referring to Figure 5 The present invention also provides a suspension bridge main cable strand erection system for implementing the suspension bridge main cable strand erection method in Embodiment 1, including a central control module, a display module, multiple strand positioning frames, a traction device, a total station, a demodulator, a reflective prism, two reference strands and multiple conventional strands; The cable support frame is fixed on the catwalk and is used to install the reference cable and regular cable; The traction device includes a winch and a roller, both of which are installed on the catwalk. The winch and roller are used to traction the reference strand and the regular strand. The reference cable integrates a fiber Bragg grating sensor for reference. Figure 3 Furthermore, the reference cable strand is connected to the demodulator for real-time monitoring of stress data within the reference cable strand and transmission to the demodulator. Total station and reflecting prism are used to obtain the linear data of the reference cable strand; The central control module communicates with the display module, demodulator, and total station to acquire and compare the stress and alignment data of the reference cable strands.

[0038] In this embodiment, the mechanical components of the cable-stayed support frame and traction device provide stable support, fiber optic grating sensors and demodulators enable real-time stress monitoring, total stations and reflecting prisms ensure alignment accuracy, the central control module processes data uniformly, and the display module provides intuitive status feedback, forming a comprehensive monitoring network. This systematic design not only improves response speed but also reduces information lag through inter-module communication, ensuring that construction personnel can make rapid decisions based on comprehensive data and reducing the probability of accidents.

[0039] Furthermore, the reference cable strands are integrated with fiber Bragg grating sensors, which are spaced apart along the extension direction of the reference cable strands, with the spacing between adjacent fiber Bragg gratings being 1 to 2 meters.

[0040] Optionally, the cable strand positioning frame in this invention is assembled from steel components and has a steel channel structure inside for installing reference cable strands and conventional cable strands.

[0041] In this embodiment, the splicing of steel components enhances structural strength, resists long-term loads and corrosion, and the steel channel structure provides directional accommodation space for the cable strands, preventing displacement. This design improves the service life and adaptability of the support frame, reduces maintenance needs, and provides a durable and reliable support foundation for cable strand erection.

[0042] Optionally, the steel channel structure in this invention has anti-slip protrusions.

[0043] In this embodiment, the anti-slip protrusions increase the frictional resistance between the cable strands and the steel channel, preventing slippage caused by construction vibrations or wind loads and ensuring the stability of the cable strand position. This detailed design not only reduces the frequency of adjustments but also improves the overall system reliability through a passive safety mechanism.

[0044] 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.

[0045] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations 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 method for erecting the main cable strands of a suspension bridge, characterized in that, include: S1: Install cable strand restraint frames: According to the main cable design parameters, fix multiple cable strand restraint frames on the catwalk so that the multiple cable strand restraint frames are installed at equal intervals on the catwalk; S2: Installation of reference strands: Pull two reference strands so that the two reference strands are installed sequentially on all the positioning frames and symmetrically arranged in the lower half of the main cable design section; The reference strand has an integrated fiber optic grating sensor for real-time monitoring of stress data. S3: Baseline Strand Linearity Adjustment: Linearity detection is performed on the two baseline strands respectively to obtain linearity data, and the linearity of the two baseline strands is adjusted based on the linearity data to bring them into the designed linearity conditions; S4: Stability observation of the reference cable strand: The stability of the reference cable strand is observed. During the stability observation process, the stress fluctuation of the reference cable strand is obtained through the fiber optic grating sensor, and the linear fluctuation of the reference cable strand is obtained through the total station. When both the linear fluctuation and the stress fluctuation are lower than the preset threshold, the reference cable strand is determined to be in a stable state, and step S5 is executed; otherwise, step S3 is executed again. S5: Conventional cable strand erection: Using two reference cables as a reference, conventional cables are erected by traction, and installed on all cable strand positioning frames. During the traction erection process, the positions of the two reference cables are periodically checked until the traction erection of all conventional cables is completed.

2. The method for erecting the main cable strands of a suspension bridge according to claim 1, characterized in that, Step S1 includes: S1.1: Select the installation spacing between the cable strand support frames according to the design span of the main cable; S1.2: Based on the installation spacing between the cable support frames, the cable support frames are fixedly installed on the crossbeams at the bottom of the catwalk using bolts.

3. The method for erecting the main cable strands of a suspension bridge according to claim 1, characterized in that, Step S2 includes: S2.1: Use winches to pull the reference cable strands on the rollers respectively, so that the two reference cable strands are pulled into place respectively; S2.2: Using the transverse winch on the catwalk, the two reference strands are lifted into the set positions on the steel channels of the corresponding strand positioning frame and symmetrically arranged in the lower half of the main cable design section. S2.3: Connect the two reference cable strands to the demodulator to complete the installation of the reference cable strands.

4. The method for erecting the main cable strands of a suspension bridge according to claim 3, characterized in that, In step S2.2, the specific method of symmetrically arranging the two reference strands is as follows: take the center of the main cable section as the origin, establish a vertical central axis, and deflect it 45 degrees to both sides to form a positioning extension line, so that the geometric center of the two reference strands coincides with the positioning extension line.

5. The method for erecting the main cable strands of a suspension bridge according to claim 1, characterized in that, Step S3 includes: S3.1: Install reflective prisms at the positions corresponding to the feature points of the main cable on the two reference strands; the feature points of the main cable are located at 1 / 2 span, 1 / 4 span, 1 / 8 span and 1 / 16 span of the main cable, and the distance between adjacent feature points is no more than 200 meters. S3.2: Based on the reflective prisms on the two reference cable strands, use a total station to simultaneously collect the elevation of the feature points and the alignment of the reference cable strands; S3.3: Based on the collected feature point elevations and the baseline cable strand alignment, adjust the alignment of the two baseline cable strands to bring them into the designed alignment conditions.

6. The method for erecting the main cable strands of a suspension bridge according to claim 1, characterized in that, The stability observation of the benchmark cable strand in step S4 includes: S4.1: Select the number of days in the stability observation period, and acquire the stress fluctuation of the reference cable strand through the fiber optic grating sensor and the linear fluctuation of the reference cable strand through the total station in at least three time periods of each day in the observation period, and transmit the stress fluctuation and linear fluctuation of the reference cable strand to the central control module. S4.2: In the data processing module, the stress fluctuation and linear fluctuation of the reference cable strand are compared with preset thresholds to obtain the comparison results; the preset thresholds are linear fluctuation ≤ 1 mm and stress fluctuation ≤ 2 MPa. S4.3: If the comparison result shows that both linear fluctuation and stress fluctuation are below the preset threshold, then execute step S5; otherwise, re-execute step S3.

7. The method for erecting the main cable strands of a suspension bridge according to claim 1, characterized in that, In step S5, during the traction erection process, after every 10 conventional cable strands are erected, the positions of the two reference cable strands are rechecked, and the alignment and stress data are remeasured using a total station and demodulator, and the two reference cable strands are adjusted accordingly.

8. A suspension bridge main cable strand erection system, used to implement the suspension bridge main cable strand erection method according to any one of claims 1 to 7, characterized in that, It includes a central control module, a display module, multiple cable strand positioning frames, a traction device, a total station, a demodulator, a reflector prism, two reference cables, and multiple conventional cables; The cable support frame is fixed on the catwalk and is used to install the reference cable and regular cable; The traction device includes a winch and a roller, both of which are mounted on the catwalk. The winch and roller are used to traction the reference strand and the regular strand. The reference cable strand integrates a fiber optic grating sensor and is communicatively connected to the demodulator to monitor stress data inside the reference cable strand in real time and transmit it to the demodulator. The total station and reflecting prism are used to acquire the linear data of the reference cable strand; The central control module is communicatively connected to the display module, the demodulator, and the total station, and is used to acquire and compare the stress and alignment data of the reference cable strands.

9. The suspension bridge main cable strand erection system according to claim 8, characterized in that, The cable strand positioning frame is assembled from steel components and has an internal steel channel structure for installing the reference cable strand and the regular cable strand.

10. The suspension bridge main cable strand erection system according to claim 9, characterized in that, The steel channel structure has anti-slip protrusions.

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