Intelligent tensioning and adjusting system and method for bridge cable structure

Abstract

This application relates to the field of building construction technology, and provides an intelligent tensioning and adjustment system and method for bridge cable structures, including: a solid model reconstruction device; a CNC tensioning device; a non-contact cable force measurement device; and an intelligent control system for correcting the finite element model of the bridge cable structure, and calculating the target stress-free cable length of the specified cable based on the corrected finite element model; calculating the real-time stress-free cable length of the specified cable during the tensioning process based on the measured cable force; and fine-tuning the cable force of the specified cable based on the measured cable force and the real-time stress-free cable length, combined with the tension force and tension elongation value, so that the stress-free cable length of the specified cable reaches the target stress-free cable length. This invention realizes dynamic digital twin of the construction process, achieving high-precision, high-quality, rapid, efficient, and intelligent tensioning and adjustment construction of bridge cable structures.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to an intelligent tensioning and adjustment system and method for bridge cable structures. Background Technology

[0002] During the construction of cable-stayed bridges, suspension arch bridges, cable-stayed buildings, and other cable-structured bridges and structures, the quality control of tensioning and adjusting the cables is crucial. It directly determines whether the structure achieves its design target state and affects the subsequent operational safety of the structure.

[0003] In conventional construction, the oil pump is usually operated manually to tension the cable at the cable end. The tension force at the end is controlled by an oil pressure gauge. Then, the actual cable force is measured in the middle of the cable using a cable force detector and accelerometer. The measured actual cable force is fed back to the finite element model for calculation to determine the cable force required for the next stage. The above steps are repeated, and the cables are tensioned and adjusted repeatedly until all cables and structures reach the design target state.

[0004] The above-mentioned conventional cable tensioning and adjustment construction steps have many problems: manual tensioning is prone to issues such as unstable oil volume control, large pressure gauge errors, inaccurate elongation measurement, low tensioning efficiency, and asynchronous tensioning; cable force measuring with a cable force detector and accelerometer has problems such as easy errors in end data acquisition, significant safety hazards in high-altitude data acquisition in the middle of the cable, and low efficiency due to the limitation to single-strand testing; and the process of calculating the tension force at each stage through finite element analysis and controlling it through cable force is cumbersome, involves a large amount of calculation, has low efficiency due to repeated cable adjustments, and is susceptible to the influence of temporary loads and temperature. Summary of the Invention

[0005] To address the problems in the prior art, this application proposes an intelligent tensioning and adjustment system and method for bridge cable structures.

[0006] In a first aspect, the present invention proposes an intelligent tensioning and adjustment system for bridge cable structures, comprising:

[0007] The equipment system includes a solid model reconstruction device, a CNC tensioning device, and a non-contact cable force measurement device. The solid model reconstruction device is used to reconstruct the solid model of the bridge cable structure after the components have been installed. The CNC tensioning device is used to tension the cable group and obtain the tension force and tensile elongation value of multiple specified cables in the cable group. The non-contact cable force measurement device is used to measure the measured cable force of multiple specified cables in the cable group.

[0008] The intelligent control system, connected to the equipment system, is used to correct the finite element model of the bridge cable structure and, based on the corrected finite element model, calculate the target stress-free cable length of the specified cable; based on the measured cable force, calculate the real-time stress-free cable length of the specified cable during the tensioning process; based on the measured cable force and the real-time stress-free cable length, combined with the tension force and tension elongation value, fine-tune the cable force of the specified cable so that the stress-free cable length of the specified cable reaches the target stress-free cable length.

[0009] Furthermore, the intelligent control system includes a software system and a model data system that are connected to each other.

[0010] The model data system includes entity models;

[0011] The software system includes an entity reconstruction function module;

[0012] The entity reconstruction function module is used to send reconstruction instructions to the entity reconstruction device and perform data processing based on the feedback data from the entity reconstruction device to reconstruct the entity model.

[0013] Furthermore,

[0014] The model data system also includes a first data storage module;

[0015] The software system also includes a CNC tensioning function module, which is used to send tensioning commands to the CNC tensioning device and perform data processing based on the feedback data from the CNC tensioning device to obtain the tension force and tension elongation value, and store them in the first data storage module.

[0016] Furthermore, the model data system also includes a second data storage module;

[0017] The software system also includes a cable force measurement function module, which is used to send cable measurement commands to the non-contact cable force measurement, and perform data processing based on the feedback data of the non-contact cable force measurement to obtain the measured cable force and store it in the second data storage module.

[0018] Furthermore,

[0019] The model data system also includes the finite element model and a comparison correction unit; the comparison correction unit compares the entity model reconstructed by the entity reconstruction function module with the finite element model to correct the finite element model.

[0020] The software system also includes a calculation and analysis module. Based on the modified finite element model, the calculation and analysis module calculates the target stress-free cable length. Based on the measured cable force, it calculates the real-time stress-free cable length of the specified cable during the tensioning process. Based on the measured cable force and the real-time stress-free cable length, combined with the tensioning force and tension elongation value, it sends tensioning control data to the CNC tensioning module. The CNC tensioning module sends the tensioning command to the CNC tensioning equipment based on the tensioning control data to fine-tune the cable force of the specified cable so that the stress-free cable length of the specified cable reaches the target stress-free cable length.

[0021] Furthermore,

[0022] The model data system also includes a digital twin model and a third data storage module. The third data storage module is used to store the target stress-free cable length and the cable force increment to be adjusted. The cable force increment to be adjusted is the difference between the target stress-free cable length and the real-time stress-free cable length.

[0023] The software system also includes a digital twin display module, which is connected to the first data storage module, the second data storage module and the third data storage module, and is used to generate the digital twin model and display the data.

[0024] Furthermore,

[0025] The solid model reconstruction equipment includes a 3D digital model building device based on 3D laser scanning technology. This device is positioned on the bridge deck or a relatively stable location on the ground, using high-precision laser scanning technology to acquire the 3D coordinates of key structural points and perform point cloud scanning of components. Then, through data processing and 3D model reconstruction, a high-precision 3D solid model is obtained.

[0026] Furthermore, the CNC tensioning equipment includes a centralized pumping station and sensor-type jacks. The centralized pumping station is located on the bridge deck and connected to the sensor-type jacks via oil pipes; the sensor-type jacks are positioned at the anchor heads at the ends of the cables. Through the centralized pumping station, multi-point synchronous or single-point asynchronous hydraulic pressure control is performed on the sensor-type jacks at each cable location, thereby realizing the adjustment of tension force.

[0027] Furthermore, the non-contact cable force measurement device includes a machine vision-based cable force measurement device. This device is positioned on the bridge deck or a relatively stable location on the ground, using a high-precision industrial camera to capture video images of the cable. Through digital image technology and specific algorithms, the cable force of the cable (i.e., the specified cable) is calculated in real time.

[0028] Furthermore, the non-contact cable force measurement device includes a radar-based cable force measurement device. This device is positioned on the bridge deck or a relatively stable location on the ground, using high-precision radar microwaves to measure the microwave feedback data of the cables. Through data processing and specific algorithms, the cable force is calculated in real time.

[0029] Secondly, this invention also proposes a method for tensioning and adjusting bridge cable structures using an intelligent tensioning and adjustment system for bridge cable structures, comprising the following steps:

[0030] Step 1: Reconstruct the solid model of the bridge cable structure after the component installation has been completed using the solid model of the equipment system, and correct the finite element model of the bridge cable structure.

[0031] Step 2: The intelligent control system calculates the target stress-free cable length of the specified cable based on the modified finite element model;

[0032] Step 3: Use the CNC tensioning equipment of the equipment system to tension the cable group and obtain the tension force and tensile elongation value of multiple specified cables in the cable group; use the non-contact cable force measuring equipment of the equipment system to measure the actual cable force of multiple specified cables in the cable group;

[0033] Step 4: Based on the measured cable force, the intelligent control system calculates the real-time stress-free cable length of the specified cable during the tensioning process. Based on the measured cable force and the real-time stress-free cable length, and in conjunction with the tensioning force and tension elongation value, the intelligent control system controls the CNC tensioning equipment to fine-tune the cable force of the specified cable so that the stress-free cable length of the specified cable reaches the target stress-free cable length.

[0034] Furthermore, the intelligent control system, based on the measured cable force and the real-time stress-free cable length, and in conjunction with the tension force and tension elongation value, controls the CNC tensioning equipment to fine-tune the cable force of the specified cable in the following steps:

[0035] The intelligent control system synchronously adjusts the tension of the cable group of the CNC tensioning equipment based on the measured cable force. At the same time, the intelligent control system compares the real-time stress-free cable length with the target stress-free cable length to obtain the increment of cable force to be adjusted. Based on the increment of cable force to be adjusted, the system synchronously adjusts the tension elongation value of the cable group of the CNC tensioning equipment to fine-tune the cable force of the specified cable so that the stress-free cable length of the specified cable reaches the target stress-free cable length.

[0036] Furthermore, the cable group of the bridge cable structure includes multiple sets of designated cables, and the multiple sets of designated cables are tensioned and adjusted one by one according to the steps of steps 3 and 4.

[0037] Furthermore, the tensioning of the cable group is preset into multiple tensioning stages, and the designated cables of all groups in each tensioning stage are tensioned sequentially in a preset order.

[0038] The beneficial effects of this invention are:

[0039] The equipment is reconstructed by using the physical model of the equipment system. The physical model of the bridge cable structure with the components installed is reconstructed to eliminate the installation error of the structure. During the process, the actual deformation of the cable structure (real-time stress-free cable length) can be verified to see if it matches the theoretical deformation (target stress-free cable length) of the finite element model.

[0040] Through the use of CNC tensioning equipment, multi-point synchronous and precise control can be achieved, and the tension force and elongation can be fed back in real time.

[0041] The number of CNC tensioning equipment can be flexibly adjusted according to demand, thereby enabling more cables to be tensioned at once, reducing the number of tensioning operations and the number of times the jacks of the CNC tensioning equipment need to be moved, and further shortening the tensioning period.

[0042] With the help of non-contact cable force measurement equipment, there is no need for high-altitude installation work. Multiple cables can be measured simultaneously, and accurate cable force values ​​can be obtained quickly and in real time.

[0043] Utilizing the principle of the stress-free state method, by calculating the stress-free cable length in real time and combining it with the real-time tension force and tension elongation value of the anchor head, cable adjustment can be performed primarily based on the stress-free cable length and secondarily on the tension force. This allows for one-time tensioning of the cable, avoiding multiple rounds of repeated tensioning, repeated cable force measurements, and multiple model calculations and adjustments. Only a single comprehensive measurement and a few local cable adjustments are required at the end.

[0044] The entire tensioning and cable adjustment process utilizes intelligent technology, employing a smart control system to control the equipment system. The equipment system automatically collects and transmits data, and the smart control system automatically generates the next tensioning data based on the feedback data and a pre-defined algorithm. During the tensioning and cable adjustment process, a digital twin model is set up to display the dynamic changes in construction process data in real time, facilitating technical personnel's control over the entire construction process.

[0045] It improves construction accuracy and quality, reduces subsequent operational safety risks, and the relevant data, models, and systems can also be used for later digital operation and maintenance; it improves tensioning and cable adjustment efficiency, significantly reduces workload, and significantly shortens construction period. Without increasing equipment, it can shorten the traditional 2-3 months to about half a month. If the number of equipment systems is increased, the traditional 2-3 month construction period can be further shortened to 2-3 days. Attached Figure Description

[0046] Figure 1This is a logic diagram of the intelligent tensioning and adjustment system for bridge cable structures according to the present invention.

[0047] Figure 2 This is a flowchart of the intelligent tensioning and adjustment method for bridge cable structures according to the present invention.

[0048] Figure 3 This is a model diagram of a bridge to which the system or method of the present invention is applicable.

[0049] Figure 4 for Figure 3 A diagram showing the cable numbering system of a bridge.

[0050] Figure 5 for Figure 3 A schematic diagram comparing the reconstructed solid model of the cable-stayed bridge structure with the original finite element model.

[0051] Figure 6 This is a schematic diagram of a cable element before and after deformation when calculating the length of a stress-free cable in this invention.

[0052] Figure 7 This is a schematic diagram of the stress on a single cable element when calculating the length of a stress-free cable in this invention.

[0053] In the figure: 1- Cables of the reconstructed solid model; 2- Cables of the finite element model before correction. Detailed Implementation

[0054] The following is in conjunction with the appendix Figure 1-7 The present invention will be further described in detail with reference to specific embodiments.

[0055] like Figure 1 As shown, the intelligent tensioning and adjustment system for bridge cable structures proposed in this invention includes an equipment system and an intelligent control system.

[0056] The equipment system includes a solid model reconstruction device, a CNC tensioning device, and a non-contact cable force measurement device. The solid model reconstruction device is used to reconstruct the solid model of the bridge cable structure after the components have been installed. The CNC tensioning device is used to tension the cable group and obtain the tension force and elongation value of multiple specified cables in the cable group. The non-contact cable force measurement device is used to measure the measured cable force of multiple specified cables in the cable group. Here, "cable group" refers to a cluster of multiple cables. It can be understood that a cable group refers to multiple cables; in this embodiment, "cable" refers to the tension cables of the bridge cable structure. "Specified cable" can also be understood as the tension cable that needs to be tensioned and adjusted.

[0057] The intelligent control system is connected to the equipment system to correct the finite element model of the bridge cable structure. Based on the corrected finite element model, it calculates the target stress-free cable length of the specified cable. Based on the measured cable force, it calculates the real-time stress-free cable length of the specified cable during the tensioning process. Based on the measured cable force and the real-time stress-free cable length, combined with the tension force and tension elongation value, it fine-tunes the cable force of the specified cable to make the stress-free cable length of the specified cable reach the target stress-free cable length.

[0058] The solid model reconstruction equipment includes a 3D digital model building device based on 3D laser scanning technology. This device is positioned on the bridge deck or a relatively stable location on the ground, using high-precision laser scanning technology to acquire the 3D coordinates of key structural points and perform point cloud scanning of components. Then, through data processing and 3D model reconstruction, a high-precision 3D solid model is obtained.

[0059] The CNC tensioning equipment includes a centralized pumping station and sensor-type jacks. The centralized pumping station is located on the bridge deck and connected to the sensor-type jacks via oil pipes; the sensor-type jacks are positioned at the anchor heads at the ends of the cables. Through the centralized pumping station, multi-point synchronous or single-point asynchronous hydraulic pressure control is achieved for the sensor-type jacks at each cable location, thereby realizing the adjustment of tension force.

[0060] The non-contact cable force measurement device includes a machine vision-based cable force measurement device. This device is positioned on the bridge deck or a relatively stable location on the ground, using a high-precision industrial camera to capture video images of the cables. Through digital image technology and specific algorithms, the cable force of the cable (i.e., the specified cable) is calculated in real time.

[0061] The non-contact cable force measurement device includes a radar-based cable force measurement device. This device is positioned on the bridge deck or a relatively stable location on the ground, using high-precision radar microwaves to measure the microwave feedback data of the cables. Through data processing and specific algorithms, the cable force is calculated in real time.

[0062] By employing non-contact cable force detection technologies such as radar microwave and machine vision, the cable force of a cable group can be measured quickly and simultaneously. This solves the problems of disconnect between tensioning and cable force measurement in previous construction projects, large deviations between measured and actual cable force leading to multiple cable force adjustments, high safety risks associated with installing accelerometers in traditional techniques, inaccurate cable force measurements, low construction efficiency, and low precision.

[0063] The intelligent control system includes a software system and a model data system that are connected to the data.

[0064] The model data system includes entity models;

[0065] The software system includes an entity reconstruction function module;

[0066] The entity reconstruction function module is used to send reconstruction instructions to the entity reconstruction device and perform data processing based on the feedback data from the entity reconstruction device to reconstruct the entity model.

[0067] The model data system also includes a first data storage module;

[0068] The software system also includes a CNC tensioning function module, which is used to send tensioning commands to the CNC tensioning equipment and perform data processing based on the feedback data from the CNC tensioning equipment to obtain the tension force and tension elongation value, and store them in the first data storage module.

[0069] The model data system also includes a second data storage module;

[0070] The software system also includes a cable force measurement function module, which sends cable measurement commands to the non-contact cable force measurement system, processes the feedback data from the non-contact cable force measurement system to obtain the measured cable force, and stores it in the second data storage module.

[0071] The model data system also includes a finite element model and a comparison correction unit; the comparison correction unit compares the entity model reconstructed by the entity reconstruction function module with the finite element model to correct the finite element model.

[0072] The software system also includes a calculation and analysis module. Based on the modified finite element model, the calculation and analysis module calculates the target stress-free cable length. Based on the measured cable force, it calculates the real-time stress-free cable length of the specified cable during the tensioning process. Based on the measured cable force and the real-time stress-free cable length, combined with the tension force and tension elongation value, it sends tension control data to the CNC tensioning module. The CNC tensioning module sends tensioning commands to the CNC tensioning equipment based on the tension control data to fine-tune the cable force of the specified cable so that the stress-free cable length of the specified cable reaches the target stress-free cable length.

[0073] The model data system also includes a digital twin model and a third data storage module. The third data storage module is used to store the target stress-free cable length and the cable force increment to be adjusted. The cable force increment to be adjusted is the difference between the target stress-free cable length and the real-time stress-free cable length.

[0074] The software system also includes a digital twin display module, which is connected to the first data storage module, the second data storage module, and the third data storage module to generate digital twin models and display the data.

[0075] The intelligent tensioning and adjustment system for bridge cable structures in this embodiment solves the problems of cumbersome cable adjustment, complicated steps, and difficulty in achieving the design target state when controlling the cable through force value under conditions such as complex structures, complex working conditions, flexible structures, large structural nonlinear effects, and susceptibility to external loads or temperature. It can quickly achieve the design target state of the bridge cable structure.

[0076] like Figure 2 As shown, based on the same inventive concept, this invention also proposes a method for tensioning and adjusting bridge cable structures using the aforementioned intelligent tensioning and adjustment system, comprising the following steps:

[0077] Step 1: Reconstruct the solid model of the bridge cable structure after the components have been installed using the solid model of the equipment system, and correct the finite element model of the bridge cable structure.

[0078] Step 2: The intelligent control system calculates the target stress-free cable length of the specified cable based on the modified finite element model.

[0079] Step 3: Use the CNC tensioning equipment of the equipment system to tension the cable group and obtain the tension force and tensile elongation value of multiple specified cables in the cable group; use the non-contact cable force measuring equipment of the equipment system to measure the actual cable force of multiple specified cables in the cable group.

[0080] Step 4: Based on the measured cable force, the intelligent control system calculates the real-time stress-free cable length of the specified cable during the tensioning process. Based on the measured cable force and the real-time stress-free cable length, and in conjunction with the tensioning force and tension elongation value, the intelligent control system controls the CNC tensioning equipment to fine-tune the cable force of the specified cable so that the stress-free cable length of the specified cable reaches the target stress-free cable length.

[0081] The intelligent control system, based on the measured cable force and the real-time stress-free cable length, and in conjunction with the tension force and tension elongation value, controls the CNC tensioning equipment to fine-tune the cable force of the specified cable in the following steps:

[0082] The intelligent control system synchronously adjusts the tension of the cable group of the CNC tensioning equipment based on the measured cable force. At the same time, the intelligent control system compares the real-time stress-free cable length with the target stress-free cable length to obtain the increment of cable force to be adjusted. Based on the increment of cable force to be adjusted, the system synchronously adjusts the tension elongation value of the cable group of the CNC tensioning equipment to fine-tune the cable force of the specified cable so that the stress-free cable length of the specified cable reaches the target stress-free cable length.

[0083] In this embodiment, the cable group of the bridge cable structure includes multiple sets of designated cables, and the multiple sets of designated cables are tensioned and adjusted one by one according to the steps of steps 3 and 4.

[0084] The tensioning of the cable group is preset into multiple tensioning stages, and the designated cables of all groups in each tensioning stage are tensioned sequentially in a preset order.

[0085] The method in this embodiment also includes a review and verification step:

[0086] When the tensioning and adjustment of the specified cables reach a certain intermediate tensioning stage and the final tensioning stage, the cable force and structural state of the specified cables are analyzed and calculated by reconstructing the solid model and correcting the finite element model. The control of the stress-free cable length is then checked and verified. After ensuring that the cable force and structural state of all groups of specified cables in this tensioning stage meet the design conditions and requirements, the cable group is then tensioned and adjusted for the next stage.

[0087] By employing intelligent methods, this invention systematically integrates and unifies the entire process of bridge cable structure construction, including physical model reconstruction, finite element model correction, digital twin-based programmed control of automatic cable tensioning, simultaneous non-contact rapid measurement of actual cable forces across multiple cables, tension control and adjustment based on stress-free cable length, and verification using the reconstructed physical model and corrected finite element model. This process displays various working conditions and data in real time, achieving intelligent construction of bridge cable structures throughout the entire process. This addresses many shortcomings of traditional construction methods and significantly improves construction quality and efficiency. This invention is applicable not only to cable-stayed bridges, suspension arch bridges, and other bridge cable structures, but also to architectural cable structures, demonstrating its wide range of applications.

[0088] like Figure 3 , 4 As shown, the traditional method for tensioning and adjusting cables is as follows:

[0089] Cable tensioning stage division: Calculation and analysis are performed according to the design finite element model to calculate the cable tensioning stages, tensioning sequence, and tension force of each cable in each tensioning stage.

[0090] The first stage of tensioning involves symmetrical tensioning in both the longitudinal and transverse directions, in the following order: LZ7→LZ6→LZ5→LZ4→LZ3→LZ2→LZ1, for a total of 7 groups of cables, with 4 cables in each group being tensioned simultaneously.

[0091] The second stage of tensioning involves symmetrical tensioning in both the longitudinal and transverse directions, in the following order: LF6→LF5→LF4→LF3→LF2→LF1, for a total of 6 groups of cables, with 4 cables in each group being tensioned simultaneously.

[0092] The third stage of tensioning: symmetrical tensioning in the transverse direction, and tensioning in the longitudinal direction from one end to the other, for example, as shown in the example. Figure 4 The longitudinal bridge shown is tensioned sequentially from left to right:

[0093] LZ1→LZ2→LZ3→LZ4→LZ5→LZ6→LZ7→LZ7'→LZ6'→LZ5'→LZ4'→LZ3'→LZ2'→LZ1', a total of 14 groups of cables, with 2 cables in each group being tensioned simultaneously. Among them, LZ7' to LZ1' are... Figure 4 LZ7 to LZ1 are located on the right side of the middle section.

[0094] Fourth stage tensioning: Symmetrical tensioning in the transverse direction, and longitudinal tensioning from one end (left) to the other end (right), in sequence:

[0095] LF1→LF2→LF3→LF4→LF5→LF6→LF6'→LF5'→LF4'→LF3'→LF2'→LF1', a total of 12 groups of cables, with 4 cables in each group being tensioned simultaneously.

[0096] Cable adjustment phase: Conduct multiple rounds of synchronous adjustment of multiple cables or asynchronous adjustment of a single cable.

[0097] Construction operations during tensioning:

[0098] Let's take the first stage of tensioning as an example.

[0099] The first set of four LZ7 cables is tensioned: ① Four traditional hydraulic jacks are installed at the cable anchors under the bridge. The hydraulic pressure is manually controlled, and walkie-talkies are used to communicate the tensioning progress of the four jacks to maintain synchronization as much as possible. ② After tensioning, technicians use a crane basket to lift the cables into the air and bring traditional cable measuring equipment into contact with the cables to measure the cable tension of each of the four cables. ③ Technicians input the measured cable tension into a computer finite element model, calculate and analyze it, and adjust the tension for the next set of cables accordingly.

[0100] Move the tensioning equipment, such as jacks and oil pumps, to the location of the second group of four LZ6 cables to complete the tensioning of the second group of cables. Measure the cable forces of the second group and the first group, and then calculate and analyze the tension force of the next group.

[0101] The next five sets of cables are tensioned in sequence to complete the first stage of tensioning.

[0102] Follow these steps to complete the subsequent tensioning stages.

[0103] Finally, based on the measured cable force results, multiple rounds of repeated cable adjustments were made until the bridge reached its completed state.

[0104] The drawbacks of traditional tensioning:

[0105] (1) There are large errors in the actual installation of the bridge structure. The results obtained by calculation and tensioning according to the theoretical design model do not match the actual bridge structure.

[0106] (2) Using traditional jacks and oil pumps, the tension is controlled by manually operating the oil pressure gauge, which results in a large tensioning error.

[0107] (3) Using traditional equipment to measure cable force poses significant safety risks and is very inefficient.

[0108] (4) Although the theoretical tension data of each group of cables in each stage has been calculated in advance by computer finite element model, due to on-site installation errors, tensioning errors, changes in cable force in the previous stage during tensioning, and other influencing factors, it is necessary to measure the bridge condition and make timely calculation adjustments. The traditional tensioning and cable adjustment process is as follows: cable tensioning is controlled by hydraulic pressure gauge → the tension of all tensioned cables is measured → the theoretical tension is calculated and analyzed by finite element model → the next round of tensioning, measurement and calculation analysis, and finally multiple rounds of cable adjustment are carried out. This process is cumbersome. If there are many cables, it often requires more than ten or even dozens of rounds, which is a lot of work and the equipment is moved repeatedly, resulting in very low efficiency.

[0109] When using the system and method of this invention for tensioning and cable adjustment, first deploy the intelligent tensioning and cable adjustment system, correct the finite element model and perform calculations and analyses, and then arrange the intelligent tensioning and cable adjustment system and related equipment.

[0110] Using a solid model reconstruction device installed on the bridge deck, the bridge structure was scanned, and a solid model of the bridge cable structure with completed component installation before tensioning was reconstructed. This model was then compared with the design finite element model, and the finite element model was corrected to ensure that installation errors in the bridge cable structure were corrected. Figure 5 As shown in the diagram, which compares the reconstructed solid model with the original finite element model, or compares the reconstructed solid model with the design model, it can be clearly seen that there is an error in the cable position between the reconstructed solid model and the design model. Figure 5 The multiple parallel, spaced vertical lines within the central sector area are the cables.

[0111] This invention uses a modified finite element model to calculate the target stress-free cable length of each cable and the theoretical tension force of the cable at each tensioning stage, and uses stress-free cable length control as the main method for tensioning and cable adjustment.

[0112] Construction operations during tensioning:

[0113] Combined with appendix Figure 4 The following explanation will be based on the first tensioning stage.

[0114] First, tension the first group of four LZ7 cables: ① A centralized pump station on the bridge deck and four sensor-type jacks at the cable anchors under the bridge form a CNC tensioning system. The control program synchronizes the tensioning of the four sensor-type jacks and provides real-time feedback on the anchor tension and elongation. ② During tensioning, a non-contact cable force measuring device on the bridge deck measures the cable force of the first group of four cables in real time, and an algorithm calculates the stress-free cable length in real time. ③ Based on the real-time measured cable force (i.e., the actual measured cable force) and the calculated stress-free cable length, combined with the tension force and elongation feedback from the anchors, the cable force of the first group of four cables is fine-tuned to ensure that the stress-free cable length reaches the target stress-free cable length. This approach, prioritizing stress-free cable length control and using tension force as a secondary measure, completes the tensioning and adjustment of the first group of four cables.

[0115] Move the tensioning equipment, such as jacks and oil pumps, to the location of the second group of four LZ6 cables to complete the tensioning and adjustment of the second group of cables.

[0116] The next five sets of cables are tensioned in sequence to complete the first tensioning stage.

[0117] Follow these steps to complete each subsequent tensioning stage.

[0118] Finally, the cable tension of the entire bridge was measured once, and the stress-free cable length of the entire bridge was calculated and compared with the stress-free cable length in the completed bridge state. The stress-free cable length was the main control, and the tension was used as a supplement. A small number of local cable adjustments were made to achieve the completed bridge state.

[0119] Combined with appendix Figure 6 , 7 The formula for calculating the length of stress-free cable is as follows:

[0120] The length of the stress-free cable L0 = [L C +L C 3 q 2 cos 2 α / (24T 2 )] / (1+T / EA)

[0121] in: In the formula (x b ,y b ), (x a ,y a Coordinate data such as ) can be obtained through a modified finite element model, such as Figure 6 As shown, taking a cable unit, i.e., a single cable, as an example, the coordinates of the upper anchor point of this cable unit are (x... b ,y b The coordinates of the lower anchorage point of the cable element are (x...). a ,y aThe coordinates of the lower anchor point after the cable element deforms are (x...). a +w a ,y a +v a The coordinates of the upper anchor point after the cable element deforms are (x... b +w b ,y b +v b The actual changes in structural coordinates can be verified to be consistent with the finite element model by reconstructing the solid structure after tensioning.

[0122] Analyze the two states of the cable before and after tensioning, combined with the attached... Figure 7 The cable length before tensioning is S1 = L 01 +T1L 01 / (EA), the cable length after tensioning is S2=L 02 +T2L 02 Subtracting the two equations and ignoring second-order quantities, we obtain the required adjustment of cable force increment ΔT. 12 :

[0123] △T 12 =EA[(S2-S1)-(L 02 -L 01 )] / L 02 In the formula, S2-S1 is obtained through the tension of the cable, and L is the length of the cable. 01 and L 02 These are the unstressed cable lengths before and after tensioning, respectively. The cable force increment ΔT needs to be adjusted as required. 12 Then the corresponding search work can be carried out.

[0124] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A bridge cable structure intelligent tensioning adjustment system, characterized in that, include: The equipment system includes a solid model reconstruction device, a CNC tensioning device, and a non-contact cable force measurement device; The solid model reconstruction equipment is used to reconstruct the solid model of the bridge cable structure after the components have been installed; the CNC tensioning equipment is used to tension the cable group and obtain the tension force and tension elongation value of multiple specified cables in the cable group. The non-contact cable force measuring device is used to measure the actual cable force of multiple specified cables in a cable group; The intelligent control system is connected to the equipment system for correcting the finite element model of the bridge cable structure and, based on the corrected finite element model, calculating the target stress-free cable length of the specified cable. Based on the measured cable force, the real-time stress-free cable length of the specified cable during the tensioning process is calculated in real time. Based on the measured cable force and the real-time stress-free cable length, combined with the tension force and tension elongation value, the cable force of the specified cable is finely adjusted so that the stress-free cable length of the specified cable reaches the target stress-free cable length. The intelligent control system includes a software system and a model data system that are interconnected by data; The model data system includes entity models; The software system includes an entity reconstruction function module; The entity reconstruction function module is used to send reconstruction instructions to the entity model reconstruction device and perform data processing based on the feedback data from the entity model reconstruction device to reconstruct the entity model. The model data system also includes a first data storage module; The software system also includes a CNC tensioning function module, which is used to send tensioning commands to the CNC tensioning device and perform data processing based on the feedback data of the CNC tensioning device to obtain the tension force and tension elongation value, and store them in the first data storage module; The model data system also includes a second data storage module; The software system also includes a cable force measurement function module, which is used to send cable measurement commands to the non-contact cable force measurement, and perform data processing based on the feedback data of the non-contact cable force measurement to obtain the measured cable force and store it in the second data storage module; The model data system also includes the finite element model and a comparison correction unit; the comparison correction unit compares the entity model reconstructed by the entity reconstruction function module with the finite element model to correct the finite element model. The software system also includes a calculation and analysis module. Based on the modified finite element model, the calculation and analysis module calculates the target stress-free cable length. Based on the measured cable force, it calculates the real-time stress-free cable length of the specified cable during the tensioning process. Based on the measured cable force and the real-time stress-free cable length, combined with the tensioning force and tension elongation value, it sends tensioning control data to the CNC tensioning module. The CNC tensioning module sends the tensioning command to the CNC tensioning equipment based on the tensioning control data to fine-tune the cable force of the specified cable so that the stress-free cable length of the specified cable reaches the target stress-free cable length. The model data system also includes a digital twin model and a third data storage module. The third data storage module is used to store the target stress-free cable length and the cable force increment to be adjusted. The cable force increment to be adjusted is the difference between the target stress-free cable length and the real-time stress-free cable length. The software system also includes a digital twin display module, which is connected to the first data storage module, the second data storage module and the third data storage module, and is used to generate the digital twin model and display the data. During the tensioning and cable adjustment process, a digital twin model is set up to display the dynamic changes of construction process data in real time, which makes it easier for technicians to control the entire construction process.

2. A method for tensioning and adjusting bridge cable structures using the intelligent tensioning and adjustment system for bridge cable structures as described in claim 1, characterized in that, Includes the following steps: Step 1: Reconstruct the solid model of the bridge cable structure after the component installation has been completed using the solid model of the equipment system, and correct the finite element model of the bridge cable structure. Step 2: The intelligent control system calculates the target stress-free cable length of the specified cable based on the modified finite element model; Step 3: Use the CNC tensioning equipment of the equipment system to tension the cable group and obtain the tension force and tensile elongation value of multiple specified cables in the cable group; use the non-contact cable force measuring equipment of the equipment system to measure the actual cable force of multiple specified cables in the cable group; Step 4: Based on the measured cable force, the intelligent control system calculates the real-time stress-free cable length of the specified cable during the tensioning process. Based on the measured cable force and the real-time stress-free cable length, and in conjunction with the tensioning force and tension elongation value, the intelligent control system controls the CNC tensioning equipment to fine-tune the cable force of the specified cable so that the stress-free cable length of the specified cable reaches the target stress-free cable length. The intelligent control system, based on the measured cable force and the real-time stress-free cable length, and in conjunction with the tension force and tension elongation value, controls the CNC tensioning equipment to fine-tune the cable force of the specified cable in the following steps: The intelligent control system adjusts the tension of the cable group of the CNC tensioning equipment synchronously based on the measured cable force; at the same time, the intelligent control system compares the real-time stress-free cable length with the target stress-free cable length to obtain the cable force increment to be adjusted, and adjusts the tension elongation value of the cable group of the CNC tensioning equipment synchronously based on the cable force increment to fine-tune the cable force of the specified cable so that the stress-free cable length of the specified cable reaches the target stress-free cable length; The cable group of the bridge cable structure includes multiple sets of the specified cables, and the multiple sets of the specified cables are tensioned and adjusted one by one according to the steps of step 3 and step 4. The tensioning of the cable group is preset into multiple tensioning stages, and the designated cables of all groups in each tensioning stage are tensioned sequentially in a preset order.

Images