Tensioning intelligent detection method and system for stay cable of cable-stayed cradle

Abstract

The invention relates to the technical field of stay cable tensioning, in particular to an intelligent tensioning detection method and system for a stay cable of a cable-stayed cradle, and the method comprises the steps: obtaining preset design parameters and control parameters, obtaining the elevation data of the front end of the cradle and the pressure data collected by a pressure sensor arranged at the bottom of a jack, correcting the elevation data, and determining the tension of the stay cable of the cradle. Converting the pressure data into cable force data, correcting the cable force data, acquiring elevation deviation according to the elevation data and the main beam design elevation, and acquiring cable force deviation according to the cable force data and the stay cable design cable force; a first elevation adjustment instruction is obtained according to the elevation deviation and an elevation allowable deviation threshold value, the first elevation adjustment instruction is used for instructing the hanging basket to be adjusted to a preset elevation, a first tension adjustment instruction is obtained according to the cable force deviation and a cable force allowable deviation threshold value, and the first tension adjustment instruction is used for instructing a cable jack to adjust tension of a cable. Real-time monitoring of the elevation and the cable force and gradient adjustment of the cable force are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stay cable tensioning, in particular to a tensioning intelligent detection method and system for stay cable of stay cable hanging basket. BACKGROUND

[0002] The stay cable hanging basket construction technology is one of the core technologies for the main girder construction of a long-span cable-stayed bridge. It provides reliable support for the bridge body through three-stage tensioning of the stay cable, and precisely controls the main girder elevation to ensure that the linear of the bridge after completion meets the design requirements. Among them, the second-stage tensioning of the stay cable is a key process, which needs to be implemented when the concrete is poured to 50%, and the front end elevation of the hanging basket and the tension of the stay cable need to be monitored synchronously to ensure that both parameters are within the design allowable range, thereby laying a foundation for the subsequent full-section concrete pouring and three-stage tensioning adjustment.

[0003] The existing second-stage tensioning and monitoring of the stay cable of the stay cable hanging basket adopts a manual operation mode, and the specific process is as follows: first, collect the initial elevation data after the formwork elevation is formed; after the first-stage tensioning is completed, manually collect the jack pressure data and the hanging basket elevation data; when the concrete is poured to 50%, the operator controls the jack to perform the second-stage tensioning according to the construction experience, and simultaneously manually records the pressure and elevation data; after the full-section concrete pouring is completed, the relevant data is collected again; after the concrete reaches the design strength, the cable force conversion is performed; finally, the bridge surface elevation is adjusted through manual three-stage tensioning to complete the entire tensioning process.

[0004] However, the existing manual operation mode has the following core technical problems: during the second-stage tensioning, the coordinated control precision of the elevation and the cable force is insufficient, and real-time dynamic adjustment cannot be achieved. Specifically, on the one hand, the manual control of the jack tensioning force depends on experience judgment, and it is difficult to accurately match the cable force design value, which easily causes cable force over-adjustment or under-adjustment, directly affecting the support effect of the stay cable on the hanging basket; on the other hand, the elevation and cable force data are collected in stages by manual means, and the dynamic change relationship between the two cannot be fed back in real time. When the elevation deviation or cable force deviation occurs, the tensioning strategy cannot be adjusted in time, resulting in deviation accumulation and ultimately affecting the linear precision of the bridge main girder; finally, the jack adjustment cannot be gradient-adjusted, resulting in insufficient adjustment precision and easy over-adjustment.

[0005] Therefore, a stay cable tensioning detection method and system capable of realizing real-time monitoring and accurate coordinated control of the elevation and the cable force is needed to solve the problems of low precision and poor real-time performance in the existing manual operation mode, the lack of real-time monitoring of the cable force and elevation, the inability to adjust the cable force in time to cause deviation accumulation, and the inability to achieve gradient adjustment of the cable force, so as to ensure the quality and efficiency of the stay cable tensioning in the stay cable hanging basket construction. SUMMARY

[0006] In order to solve the problems of low precision, poor real-time performance in manual operation mode in the prior art, lack of real-time monitoring of cable force and height, and inability to adjust the cable force to prevent deviation accumulation, the present application provides a tensioning intelligent detection method and system for stay cable of stay cable hanging basket.

[0007] In a first aspect, the present application provides a tensioning intelligent detection method for stay cable of stay cable hanging basket, comprising: obtaining preset design parameters and control parameters, the design parameters including main beam design height and stay cable design cable force, and the control parameters including height allowable deviation threshold, cable force allowable deviation threshold and cable force loss triggering threshold; obtaining height data of the front end of the hanging basket and pressure data collected by the pressure sensor arranged at the bottom of the jack, correcting the height data, converting the pressure data into cable force data and correcting the cable force data, obtaining height deviation according to the height data and the main beam design height, and obtaining cable force deviation according to the cable force data and the stay cable design cable force; obtaining a first adjustment height instruction according to the height deviation and the height allowable deviation threshold, the first adjustment height instruction being an instruction for adjusting the hanging basket to a preset height, and obtaining a first adjustment tensioning instruction according to the cable force deviation and the cable force allowable deviation threshold, the first adjustment tensioning instruction being an instruction for adjusting the tensioning of the cable by the cable jack; maintaining the posture of the jack to be not less than a preset pressure maintaining duration, the preset pressure maintaining duration being the duration of the pressure maintaining stage, obtaining a stable cable force value in the pressure maintaining stage, obtaining a measured cable force value at the end of the pressure maintaining, obtaining a cable force loss value according to the stable cable force value and the measured cable force value, and obtaining a second adjustment tensioning instruction according to the cable force loss value and the cable force loss triggering threshold, the second adjustment tensioning instruction being an instruction for adjusting the tensioning of the cable by the cable jack.

[0008] Further, the control parameters further include a height loss triggering threshold, and the pressure maintaining stage further includes: obtaining a stable height value in the pressure maintaining stage, obtaining a measured height value at the end of the pressure maintaining, obtaining a height loss value according to the stable height value and the measured height value, and obtaining a second adjustment height instruction according to the height loss value and the height loss triggering threshold, the second adjustment height instruction being an instruction for adjusting the hanging basket to a preset height.

[0009] Further, the cable force loss triggering threshold calculation formula is: wherein, is the stay cable design cable force, is the cable force loss coefficient, and the height loss triggering threshold calculation formula is: wherein, is the cable calculation length, is the height loss coefficient.

[0010] Further, the elevation data is corrected, including: The ionospheric delay correction amount is calculated based on the satellite elevation angle, and is expressed by a calculation formula as follows: , wherein, is the satellite elevation angle, is the first correction coefficient; The tropospheric delay correction amount is calculated based on the elevation data, and is expressed by a calculation formula as follows: , wherein, is the elevation data of the front end of the hanging basket, is the second correction coefficient, is the third correction coefficient; The multipath error correction amount is calculated by a sliding average filtering algorithm, and is expressed by a calculation formula as follows: , wherein, is the sliding window size, is the average value of the elevation in the window, is the jth elevation data in the sliding window; The corrected elevation data is: ; The elevation deviation is: , wherein, is the design elevation of the main beam.

[0011] Further, the pressure data is converted into cable force data and the cable force data is corrected, including: The pressure data is calibrated, the load is applied in stages according to the preset load gradient, the sensor output voltage and the standard cable force value are obtained, and a calibration equation is established by the least square method, which is expressed by a calculation formula as follows: , wherein , , n is the number of loading levels, is the sensor output voltage, is the standard cable force value, is the real-time output voltage of the sensor during the tensioning process, is the initial cable force data after calibration; The temperature correction is carried out based on the environmental temperature change and the elastic modulus of the cable, and is expressed by a calculation formula as follows: , wherein, is the cable linear expansion coefficient, A is the cross-sectional area of the cable, is the environmental temperature change, is the elastic modulus of the cable, is the cable force temperature correction amount; The corrected cable force data is: , wherein, is the cable force data after temperature correction; The cable force deviation is: ,in, Design the cable force for the stay cables.

[0012] Furthermore, the correction of the cable force data is also combined with the dynamic adjustment of the concrete pouring volume, setting a pouring volume ratio, which is expressed by the following formula: ,in, This refers to the proportion of the pouring volume. This represents the actual amount poured. The revised calculation formula for the stage design pouring volume is as follows: , The coefficient representing the influence of pouring volume is denoted as , where . This is the final cable force data after temperature correction and pouring volume adjustment.

[0013] Further, the execution of the first tensioning adjustment command is force gradient tensioning, which includes: Set the target cable force at the first strength level. Second strength level target cable force and the third-level force target cable force ,satisfy The first cable force increment is obtained based on the target cable force at each level. Second cable force increment Expressed as a calculation formula: , ,and ; The current force level is determined based on the elevation deviation and cable tension deviation, including: when or At that time, the first level of loading operation is executed, and the increment of cable force applied in a single operation is... ,in, For elevation deviation, For cable force deviation, This is the allowable elevation deviation threshold. The allowable deviation threshold for cable tension. This is the first deviation grading coefficient; when or At that time, the second-level loading operation is executed, and the increment of the cable force applied in a single operation is... ,in, This is the second deviation grading coefficient. The force attenuation coefficient, when and At that time, the third-level loading operation is executed, and the increment of the cable force applied in a single operation is... ; After each force level is loaded, maintain a preset stable time, re-collect data and calculate the elevation deviation and cable force deviation until the deviations all meet the corresponding threshold requirements.

[0014] Furthermore, the preset pressure holding time is expressed by the following formula: ,in, Basic pressure holding time, This is a duration correction factor. The rated cable force, Design cable forces for stay cables; The cable stress loss value is expressed by the following formula: ,in, To stabilize the cable force value during the pressure holding phase, The measured cable force value is used to indicate the end of the pressure holding period; When the cable stress loss value exceeds the cable stress loss trigger threshold, a second tension adjustment command is generated. The target cable stress of the second tension adjustment command is expressed by the following formula: ,in, To compensate for the tension of the target cable.

[0015] Furthermore, maintaining the jack posture for no less than a preset pressure holding time includes: The standard deviation of cable force during the pressure holding stage is calculated using the following formula: Where m represents the number of data collections during the pressure holding phase. Let j be the cable force value. This represents the average cable force. Expressed as a calculation formula: ,in, Let j be the elevation value. This is the average elevation value; Set cable force fluctuation threshold and elevation fluctuation threshold. When the standard deviation of cable force is greater than the cable force fluctuation threshold or the standard deviation of elevation is greater than the elevation fluctuation threshold, extend the pressure holding time by a preset ratio.

[0016] Secondly, a tensioning intelligent detection system for cable-stayed baskets includes: The parameter acquisition module is configured to acquire preset design parameters and control parameters. The design parameters include the design elevation of the main beam and the design cable force of the stay cables. The control parameters include the allowable deviation threshold for elevation, the allowable deviation threshold for cable force, and the trigger threshold for cable force loss. The data processing module is configured to acquire elevation data at the front end of the hanging basket and pressure data collected by the pressure sensor at the bottom of the jack, correct the elevation data, convert the pressure data into cable force data and correct the cable force data, obtain the elevation deviation based on the elevation data and the design elevation of the main beam, and obtain the cable force deviation based on the cable force data and the design cable force of the stay cables. The instruction generation module is configured to obtain a first elevation adjustment instruction based on the elevation deviation and the allowable elevation deviation threshold, wherein the first elevation adjustment instruction is to instruct the hanging basket to adjust to a preset elevation; and to obtain a first tension adjustment instruction based on the cable force deviation and the allowable cable force threshold, wherein the first tension adjustment instruction is to instruct the cable jack to adjust the tension of the cable. The tensioning module is configured to maintain the jack posture for a period of time not less than a preset holding time, the preset holding time being the duration of the holding phase; acquire the stable cable force value during the holding phase; acquire the measured cable force value at the end of the holding phase; acquire the cable force loss value based on the stable cable force value and the measured cable force value; and obtain a second tensioning adjustment command based on the cable force loss value and the cable force loss trigger threshold. The second tensioning adjustment command is to instruct the cable jack to adjust the tension of the cable.

[0017] Thirdly, the present invention provides a computer-readable storage medium storing a plurality of instructions adapted to be loaded and executed by a processor of a terminal device as described in the intelligent tension detection method for a cable-stayed basket.

[0018] Fourthly, the present invention provides a terminal device, including a processor and a computer-readable storage medium, wherein the processor is used to implement various instructions; the computer-readable storage medium is used to store multiple instructions, the instructions being adapted to be loaded and executed by the processor to provide the described intelligent tension detection method for a cable-stayed basket.

[0019] In summary, the present invention has the following beneficial technical effects: 1. This invention improves the accuracy of elevation and cable force data, laying a reliable data foundation for coordinated control. In the data processing stage, for the elevation data at the front end of the hanging basket, high-precision corrected elevation data is obtained through multi-path error correction. For the jack pressure data, the correspondence between pressure and cable force is first established through least squares calibration, and then double correction is performed based on changes in ambient temperature and concrete pouring volume, achieving accurate conversion from pressure data to cable force data. Compared to the existing technology's staged manual data collection and recording method, the data correction mechanism of this invention significantly reduces data errors, providing a reliable basis for subsequent deviation calculations and command generation.

[0020] 2. This invention achieves real-time coordinated and precise control of elevation and cable force, avoiding the accumulation of deviations. Based on the corrected elevation and cable force deviations, this invention generates a first elevation adjustment command and a first tension adjustment command, realizing the linkage adjustment of elevation and cable force. Simultaneously, the first tension adjustment command adopts a force gradient tensioning strategy, defining the deviation range according to the deviation grading coefficient and matching different cable force increments. This method of coarse adjustment followed by fine adjustment avoids the over-adjustment or under-adjustment problems of manual operation. Compared to the existing technology where tension force is controlled manually based on experience and cannot be adjusted in real time, the coordinated control mechanism of this invention can respond promptly to changes in deviation, ensuring that the elevation and cable force are always within the design allowable range, effectively avoiding the impact of accumulated deviations on the linear accuracy of the bridge main beam.

[0021] 3. This invention ensures the stability of the tensioning effect through closed-loop control of pressure holding monitoring and supplementary tensioning. The invention presets the pressure holding time and dynamically adjusts it based on the ratio of the designed cable force to the rated cable force. Simultaneously, during the pressure holding stage, it calculates the standard deviation of the cable force and elevation, and determines whether to extend the pressure holding time based on a fluctuation threshold, ensuring uniform stress distribution in the cable and reliable anchorage. For cable force loss after pressure holding, it calculates the cable force loss value and compares it with a cable force loss trigger threshold to generate a second adjustment tensioning command for supplementary tensioning, further compensating for cable force attenuation. Compared to existing technologies that lack monitoring and supplementary tensioning after pressure holding, the closed-loop control mechanism of this invention effectively solves the problem of parameters not meeting standards due to cable force loss, ensuring the construction quality of secondary tensioning.

[0022] 4. This invention achieves automated control, improves construction efficiency, replaces the full-process participation of manual operation in the prior art, reduces errors in manual recording and operation, shortens the connection time of each process, improves overall construction efficiency, and at the same time reduces the safety risks of manual operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the cross-section of the jack in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the cable-stayed bridge with a hanging basket according to Embodiment 1 of the present invention; Figure 3 This is a flowchart of the method in Embodiment 1 of the present invention; Figure 4 This is a block diagram of embodiment 2 of the present invention.

[0024] The components include: 1. Cable guide tube; 2. Anchor head; 3. Stay cable screw rod; 4. Beidou beacon; 5. Hanging basket tensioning distribution beam; 6. Screw rod ball bearing seat; 7. Support foot; 8. Second screw rod nut; 9. Tensioning operation platform; 10. First screw rod nut; 11. Pressure sensor; 12. Jack; 13. Stage to be poured; 14. Poured segment; 15. Tensioning operation platform; 16. Tensioning system. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] In existing technologies, the three-stage tensioning of cable-stayed bridges with suspended formwork is a standard procedure for the construction of large-span main beams. The entire process relies on manual operation and decentralized data recording. The specific process is as follows: After the formwork is in place and the segment to be poured is erected, the first tensioning is carried out: the operator manually controls the tensioning jacks through the tensioning operation platform, drives the stay cable screws to extend and retract along the cable guide, and applies the initial cable force to the stay cables until the chord distribution beam of the formwork is in contact with the template; when the concrete is poured to 50% of the segment to be poured, the second tensioning is carried out: because the increased concrete load will cause the formwork to sink, the operator needs to climb onto the tensioning operation platform again and manually adjust the tensioning force of the jacks based on construction experience, and supplement the cable force through the stay cable screws; after the concrete is poured across the entire section and reaches the design strength, the third tensioning is carried out: the operator adjusts the cable force of the stay cables through the tensioning system.

[0027] like Figure 1 and Figure 2 As shown, in the cable-stayed bridge traction formwork construction system, the core structure for tensioning operations is composed of local execution units and overall layout units working together: Figure 1The local execution unit shown is a collection of core execution components for the tensioning operation. The cable guide 1 is the passageway for the stay cables, used to define the cable's direction to ensure a precise connection path with the beam. The anchor head 2 is located at the lower end of the cable guide 1, used to fix the stay cables to the beam and achieve the connection between the stay cables and the beam. The stay cable screw 3 passes inside the cable guide 1, with one end connected to the stay cable and the other end extending to the tensioning distribution beam 5 of the hanging basket. It is the core load-bearing component for transmitting the tensioning force. The Beidou beacon 4 is installed on the outside of the tensioning distribution beam 5 of the hanging basket, used to collect real-time elevation data at the front end of the hanging basket as the basis for subsequent elevation deviation calculations. The tensioning distribution beam 5 of the hanging basket is one of the core load-bearing structures for the tensioning operation, used to carry tensioning-related components and transfer the tensioning load to the main body of the hanging basket. The screw ball bearing 6 is located between the stay cable screw 3 and the pressure sensor 11, used to adapt to the angular deviation of the stay cable screw 3 to ensure the tensioning is completed smoothly. The tension is evenly distributed during the process. Support leg 7 connects to the tensioning distribution beam 5 of the hanging basket and jack 12, supporting jack 12 and transmitting tension reaction force. Second screw nut 8 is located at the lower end of jack 12, cooperating with stay cable screw 3 to lock its position and maintain the tension state after tensioning. Tensioning operation platform 9 is built in the lower area of ​​the hanging basket, providing a safe working space for tensioning operators. First screw nut 10 is located at the upper end of pressure sensor 11, cooperating with stay cable screw 3 to adjust its initial installation position. Pressure sensor 11 is located at the bottom of jack 12, between jack 12 and screw ball bearing seat 6, used to collect pressure data in real time during tensioning as the raw signal for cable force conversion. Jack 12 is mounted on the lower part of the tensioning distribution beam 5 of the hanging basket and is the power element for tensioning operations. It drives its piston to extend and retract, moving stay cable screw 3 to apply cable force. Figure 2 The overall layout shown is a matching system between the tensioning structure and the bridge beam segment. The segment to be poured (13) is the beam segment corresponding to the current formwork and is one of the direct targets of the tensioning operation. Its linear accuracy is controlled by the tensioning operation. The already poured segment (14) is a beam segment that has completed concrete pouring and strength curing, connecting with the segment to be poured (13) to jointly form the linear foundation of the main beam. The tensioning operation platform (15) is erected below the segment to be poured (13) and... Figure 1 The tensioning operation platform 9 in the middle provides the operation connection space from the ground to the hanging basket, and the tensioning system 16 is... Figure 1 The combination of components such as the cable-stayed cable screw 3, jack 12, and pressure sensor 11 has one end connected to the cable-stayed cable through the cable guide and inserted into the beam of the already poured segment 14, and the other end is hinged to the main structure of the hanging basket, forming a cable-stayed cable support system for the hanging basket. It is the core load-bearing and power transmission unit for the secondary tensioning operation.

[0028] However, the existing secondary tensioning operation of the stay cables in this structural system has core technical problems: First, the tensioning force is adjusted manually based on experience, which cannot accurately match the designed cable force of the stay cables, easily causing over-adjustment or under-adjustment of the cable force, affecting the stress stability of the stay cable screws and anchor heads; Second, the acquisition of elevation data and pressure data is not synchronized, and it is impossible to provide real-time feedback on the dynamic correlation between the elevation of the front end of the hanging basket and the cable force of the stay cables. When deviations occur, they cannot be adjusted in time through the tensioning system, resulting in the accumulation of deviations and compromising the linear connection accuracy between the segments to be poured and the segments already poured; At the same time, the manual operation process is cumbersome, and the action connection of each structural component takes a long time, which not only reduces construction efficiency but also increases the safety risks of manual operation.

[0029] To address the operational shortcomings of existing structures, this embodiment provides a method and system for intelligent tension detection of cable-stayed bridge cables. The core of this system is the construction of a linkage system between structural components and intelligent modules based on the existing structure: Beidou beacons, pressure sensors, and intelligent data processing modules are connected to achieve automatic acquisition of elevation and pressure data; an intelligent control unit is integrated into the tensioning system, linking the deviation calculation results of the data processing module to achieve automatic force gradient tensioning of the jacks; simultaneously, relying on the structural space of the tensioning operation platform, parameter acquisition, command generation, and supplementary tensioning modules are deployed, forming a full-process intelligent control scheme encompassing parameter presetting, multi-source data acquisition and correction, deviation collaborative control, pressure holding monitoring, and supplementary tensioning. Specifically, for elevation data, the correction algorithms for ionospheric, tropospheric, and multipath errors are optimized based on the installation location of the Beidou beacon; for pressure data, a dynamic correction model for calibration, temperature, and pouring volume is constructed based on the pressure sensor data at the bottom of the jacks, achieving precise matching between data and structural actions.

[0030] Through the integration and improvement of this structure and intelligent algorithm, this solution can achieve multi-dimensional technical effects: First, by using the linkage between structural components and intelligent modules, data acquisition and tensioning operations can be completed manually, eliminating errors in manual reading and recording, and improving the stability of components such as cable guides and stay cable rods under stress; Second, through the intelligent linkage between pressure sensors and jacks, gradient tensioning can be achieved, ensuring the anchoring reliability of the anchor head and avoiding over- or under-adjustment of cable force; Third, relying on the real-time data interaction between the Beidou beacon and the tensioning system, dynamic and coordinated control of the elevation of the hanging basket front end and cable force can be achieved, ensuring the linear connection accuracy between the segments to be poured and the segments already poured; At the same time, the action connection time of each structural component is greatly shortened, construction efficiency is improved, and the safety risks of manual operation are reduced.

[0031] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0032] Example 1 Reference Figure 3This embodiment of a method for intelligent detection of tension of stay cables in a cable-stayed basket includes: S1. Obtain preset design parameters and control parameters. The design parameters include the design elevation of the main beam and the design cable force of the stay cables. The control parameters include the allowable deviation threshold for elevation, the allowable deviation threshold for cable force, and the trigger threshold for cable force loss. S11. The formula for calculating the cable force loss trigger threshold is: ,in, Design cable force for stay cables, The elevation loss trigger threshold is calculated using the following formula: (This is the cable force loss coefficient.) ,in, Calculate the length of the cable. This is the elevation loss coefficient.

[0033] Specifically, in step S1, the design parameters are obtained from the bridge construction design documents: the design elevation of the main beam is the linear control target value of the main beam corresponding to the segment to be poured; the design cable force of the stay cable is the target cable force value calculated based on the concrete load, the self-weight of the hanging basket and the construction live load of the segment to be poured, and is output by the structural mechanics simulation model.

[0034] The preset control parameters need to be determined in conjunction with engineering technical specifications and construction experience, and are used to determine whether the elevation of the front end of the hanging basket deviates from the design range; the allowable deviation threshold of cable force is determined based on the material strength of the stay cable and the stress performance of the anchoring system, and is used to determine whether the cable force of the stay cable meets the design requirements; the cable force loss trigger threshold is the critical value for determining the degree of cable force attenuation during the pressure holding stage, and is used as the basis for generating subsequent tensioning commands.

[0035] Supplementary details of the S11 embodiment: Specifically, in step S11, the cable force loss coefficient The value must be appropriate for the type of anchorage used in the stay cable: for wedge-type anchorages, The value range is 0.02~0.05; for anchorages at the pier head, The value range is 0.01 to 0.03. The selection of this coefficient needs to be verified by the anchorage anchorage performance test to ensure the rationality of the cable force loss trigger threshold.

[0036] The calculated length L of the cable is the effective working length of the stay cable within the cable guide tube, i.e., the straight-line distance between the upper and lower anchor heads of the stay cable, and its value is taken from the cable's fabrication design drawings. The elevation loss coefficient... The value of is determined based on the support stiffness of the hanging basket, and the range is 0.001~0.003. This coefficient needs to be corrected in combination with the pre-loading test results of the hanging basket to match the load deformation characteristics in actual construction.

[0037] The cable force loss trigger threshold is used to determine whether the cable force loss value exceeds the allowable range during the pressure holding stage, requiring the initiation of supplementary tensioning operation. The elevation loss trigger threshold is used to determine whether the elevation loss value exceeds the allowable range during the pressure holding stage, requiring the initiation of hanging basket elevation adjustment operation.

[0038] S2. Obtain the elevation data of the front end of the hanging basket and the pressure data collected by the pressure sensor set at the bottom of the jack. Correct the elevation data, convert the pressure data into cable force data and correct the cable force data. Obtain the elevation deviation based on the elevation data and the design elevation of the main beam, and obtain the cable force deviation based on the cable force data and the design cable force of the stay cable. Specifically, in step S2, the elevation data is acquired at all times, including after the formwork is in place, during concrete pouring, and during tensioning operations, and is collected in real time by a Beidou beacon installed at the chord distribution beam of the formwork. The pressure data is acquired synchronously with the elevation data, and is continuously output as an electrical signal by a pressure sensor fixed at the bottom of the jack.

[0039] The correction of elevation data aims to eliminate environmental interference during satellite positioning and ensure the accuracy of elevation data at the front end of the hanging basket; converting and correcting pressure data into cable force data is to convert sensor electrical signals into cable force values ​​that meet engineering requirements, while adapting to changes in environment and construction load; the calculation of elevation deviation and cable force deviation is the core basis for generating adjustment instructions in the future, realizing the precise correlation between deviation and control strategy.

[0040] S21. The correction of elevation data includes: S211. The ionospheric delay correction is calculated based on the satellite elevation angle, and expressed by the formula: ,in, For the satellite elevation angle, This is the first correction factor; The satellite elevation angle , is the angle between the positioning satellite received by the BeiDou beacon and the horizontal plane, calculated and output in real time by the BeiDou beacon's positioning module. The first correction coefficient The value needs to be determined based on the latitude of the construction area, and the range is 0.1 to 0.3. The higher the latitude, the lower the value. The larger the value, the more it quantifies the impact of ionospheric delay on elevation data.

[0041] S212. The tropospheric delay correction is calculated based on elevation data, expressed by the following formula: ,in, This refers to the elevation data of the front end of the hanging basket. This is the second correction factor. This is the third correction factor; The elevation data of the front end of the hanging basket This refers to the raw elevation data collected by the BeiDou beacon. The second correction coefficient... The value range is 0.5 to 1.0, and the third correction coefficient is... The value ranges from 0.001 to 0.002. Both are determined by statistical analysis of meteorological data in the construction area and are used to characterize the delay effect of tropospheric atmospheric density on elevation data.

[0042] S213. The multipath error correction is calculated using the moving average filtering algorithm, expressed as follows: ,in, To adjust the sliding window size, This represents the average elevation within the window. This represents the j-th elevation data point within the sliding window; The size n of the sliding window needs to match the elevation data acquisition frequency. If the acquisition frequency is 1Hz, then the value of n ranges from 5 to 10 to balance the filtering effect and data real-time performance. The j-th elevation data within the sliding window... , is the j-th original elevation data arranged in chronological order within the sliding window; S214. The corrected elevation data is as follows: The calculation logic involves sequentially subtracting the effects of ionospheric delay, tropospheric delay, and multipath error from the original elevation data to obtain accurate elevation data after eliminating environmental interference.

[0043] S215. The elevation deviation is: ,in, The main beam design elevation is used to determine whether the elevation of the front end of the hanging basket deviates from the allowable range, and it is the direct basis for generating the first elevation adjustment command.

[0044] S22. The process of converting pressure data into cable force data and correcting the cable force data includes: S221. Calibrate the pressure data by applying loads in stages according to a preset load gradient, obtaining the sensor output voltage and standard cable force value, and establishing the calibration equation using the least squares method, expressed as: ,in , n is the number of load levels. The sensor output voltage, This is the standard cable tension value. The sensor outputs voltage in real time during the tensioning process. These are the initial cable force data after calibration; The preset load gradient needs to be divided into 5 loading levels according to 20%, 40%, 60%, 80%, and 100% of the design cable force of the stay cable; standard cable force value The values ​​are obtained by applying graded loading to the cable guide rod using a tensile testing machine, and represent the actual cable force values ​​corresponding to each loading level.

[0045] The calibration equation established by the least squares method is used to fit the linear relationship between the sensor output voltage and the cable force. The calibration operation must be completed before each tensioning operation to eliminate the zero-point drift of the pressure sensor and ensure the accuracy of the pressure data conversion. The initial cable force data after calibration is the initial cable force value after the pressure data conversion, which is the basis for subsequent corrections.

[0046] S222. Temperature correction based on ambient temperature changes and the elastic modulus of the cable is expressed by the following formula: ,in, Let A be the linear expansion coefficient of the cable, and A be the cross-sectional area of ​​the cable. Due to changes in ambient temperature, For the elastic modulus of the cable, This is the temperature correction amount for cable tension; The change in ambient temperature The difference between the real-time temperature during tensioning and the reference temperature during calibration is collected by temperature sensors in the construction area; the coefficient of linear expansion of the cable. The elastic modulus E and cross-sectional area A of the cable are both taken from the material property specifications of the cable. The correction is used to compensate for cable force fluctuations caused by temperature changes and to ensure the environmental adaptability of the cable force data.

[0047] S223. The corrected cable tension data is as follows: ,in, This is the cable force data after temperature correction. This data is the cable force value after eliminating temperature interference, and it serves as the basis for subsequent adjustments based on the pouring volume. S224. The cable force deviation is: ,in, The design force for the stay cable is determined by the deviation value, which is used to determine whether the stay cable force deviates from the allowable range and is the direct basis for generating the first adjustment tension command.

[0048] S23. The correction of the cable force data also incorporates dynamic adjustment of the concrete pouring volume, setting a pouring volume ratio, expressed by the following formula: ,in, This refers to the proportion of the pouring volume. This represents the actual amount poured. The revised calculation formula for the stage design pouring volume is as follows: , The coefficient representing the influence of pouring volume is denoted as , where . This is the final cable force data after temperature correction and pouring volume adjustment. This data is the accurate cable force value adapted to changes in concrete load, and serves as the target cable force basis for subsequent tensioning operations, ensuring dynamic matching between cable force and construction load.

[0049] The stage design pouring volume This refers to the design volume of concrete for the corresponding stage of the segment to be poured, such as 50% of the pouring volume corresponding to secondary tensioning; the actual pouring volume. The data is collected in real time by the metering device of the concrete conveying equipment. The influence coefficient of the pouring volume... The value needs to be determined based on the concrete unit weight and the stiffness of the hanging basket support, and the range is 0.05~0.1. Its function is to quantify the degree of influence of the increase in concrete load on the cable force.

[0050] S3. A first elevation adjustment command is obtained based on the elevation deviation and the allowable elevation deviation threshold. The first elevation adjustment command is to instruct the hanging basket to adjust to a preset elevation. A first tension adjustment command is obtained based on the cable force deviation and the allowable cable force deviation threshold. The first tension adjustment command is to instruct the cable jack to adjust the tension of the cable. Specifically, in step S3, the comparison logic between the elevation deviation and the allowable elevation deviation threshold is as follows: when the elevation deviation... Greater than or equal to the allowable elevation deviation threshold When the elevation deviation is reached, the first elevation adjustment command is generated; when the elevation deviation is reached... Less than the allowable elevation deviation threshold At this time, no elevation adjustment command is generated. The first elevation adjustment command is executed by the elevation adjustment mechanism of the hanging basket. After receiving the command, the mechanism drives the hanging basket to rise and fall until the elevation of the front end of the hanging basket reaches the preset elevation.

[0051] The comparison logic between cable force deviation and the allowable cable force deviation threshold is as follows: when the cable force deviation... Greater than or equal to the cable force allowable deviation threshold At that time, the first tension adjustment command is generated; when the cable force deviation... Less than the allowable deviation threshold of cable force At this time, no tension adjustment command is generated. The first tension adjustment command is executed by the intelligent control system of the cable jack. After receiving the command, the system adjusts the tension force according to the preset force gradient tensioning strategy to achieve precise control of the cable force.

[0052] This step achieves linkage control of elevation and cable force by independently judging and generating coordinated commands for elevation deviation and cable force deviation, avoiding the problem of one parameter exceeding the standard caused by adjusting a single parameter, and ensuring the accuracy and stability of the control.

[0053] S31. The execution of the first tension adjustment command is force gradient tensioning, wherein the force gradient tensioning includes: S311. Set the target cable force for the first force level. Second strength level target cable force and the third-level force target cable force ,satisfy The first cable force increment is obtained based on the target cable force at each level. Second cable force increment Expressed as a calculation formula: , ,and ; First strength level target cable force Second strength level target cable force The value needs to be based on the design cable force of the stay cable. Determined, the specific value can be set to , Third-level force target cable force .

[0054] Based on the above values, we can obtain... , ,satisfy The core purpose of this hierarchical setting is to implement a tensioning logic of coarse adjustment followed by fine adjustment. Large increments are used to quickly reduce large deviations, while small increments are used to precisely correct small deviations, avoiding cable overshoot caused by a single large increment tensioning.

[0055] S312. Determine the current tension level based on the elevation deviation and cable force deviation. The determination of the current tension level based on the elevation deviation and cable force deviation shall use the ratio of the deviation to the corresponding threshold as the judgment index. The core logic is to match different levels of cable force increments based on the degree of deviation to achieve precise matching between deviation and tension force.

[0056] First deviation grading coefficient Second deviation grading coefficient and intensity attenuation coefficient The value needs to be determined in conjunction with construction specifications and the stiffness of the hanging basket support; the ranges are as follows: , , Prioritize , , To balance the efficiency and precision of regulation.

[0057] S313. When or When the current position is determined to be in a large deviation range, the first-level loading operation is executed, with a single applied cable force increment of [value missing]. ,in, For elevation deviation, For cable force deviation, This is the allowable elevation deviation threshold. The allowable deviation threshold for cable tension. This is the first deviation classification coefficient. The core function of this operation is to quickly reduce the deviation. By increasing the tension by a large increment, the elevation deviation or cable force deviation can be reduced to the medium deviation range in a short period of time, thereby improving the control efficiency.

[0058] S314. When or When the current position is determined to be in the middle deviation range, the second force level loading operation is executed, with the increment of cable force applied in a single operation being [value missing]. ,in, This is the second deviation grading coefficient. The force attenuation coefficient is the core function of this operation, which is to make medium-fine adjustments. By using the attenuated cable force increment, it avoids the overshoot problem caused by large increments and gradually moves the deviation closer to the small deviation range.

[0059] S315. When and When the current position is determined to be within a small deviation range, the third-level loading operation is executed, with the increment of the cable force applied in a single operation being [value missing]. The core function of this operation is precise adjustment. By using small increments of tensioning, the cable force and elevation are precisely matched to ensure that the final deviation meets the threshold requirements.

[0060] S316. After each force level is loaded, maintain a preset stable time, re-collect data and calculate the elevation deviation and cable force deviation until the deviations all meet the corresponding threshold requirements.

[0061] The value of the preset stabilization time needs to be determined in combination with the material properties of the cable and the stability characteristics of the anchoring system. The value range is 3 to 5 minutes. Its core purpose is to allow the cable to fully release stress after loading, so as to avoid deviations and misjudgments caused by instantaneous stress fluctuations.

[0062] After each force level is loaded and remains stable for a preset duration, the Beidou beacon and the pressure sensor at the bottom of the jack re-collect the elevation and pressure data at the front end of the hanging basket. The elevation deviation and cable force deviation are recalculated according to the correction method in step S2. If the recalculated deviations all meet the corresponding threshold requirements, the tensioning adjustment is stopped; if there are still deviations exceeding the threshold, the force level judgment and loading operations in steps S312 to S315 are repeated until the deviations all meet the threshold requirements, forming a closed-loop control logic to ensure the accuracy of the tensioning effect.

[0063] S4. Maintain the jack posture for no less than the preset pressure holding time, where the preset pressure holding time is the duration of the pressure holding phase. Obtain the stable cable force value during the pressure holding phase, obtain the measured cable force value at the end of the pressure holding phase, obtain the cable force loss value based on the stable cable force value and the measured cable force value, and obtain the second adjustment tensioning command based on the cable force loss value and the cable force loss trigger threshold. The second adjustment tensioning command is to instruct the cable jack to adjust the tension of the cable.

[0064] Specifically, in step S4, maintaining the jack posture means locking the piston position through the jack's intelligent control system to prevent piston displacement and ensure that the stay cable is under constant tension. The core function of the preset pressure holding time is to allow the stress in the stay cable to fully relax and the anchorage to stabilize, avoiding misjudgment of cable force loss due to instantaneous stress fluctuations.

[0065] The stable cable force value during the pressure holding phase is obtained as follows: when the pressure holding time reaches 50%, at least 10 sets of cable force data are continuously collected. After removing outliers, the arithmetic mean is taken as the stable cable force value during the pressure holding phase. The measured cable force value at the end of the pressure holding phase is the cable force data collected at the exact moment the pressure holding time expires. The cable force loss value is the difference between the stable cable force value and the measured cable force value, used to characterize the degree of cable force attenuation during the pressure holding phase.

[0066] When the cable force loss value is greater than the cable force loss trigger threshold, it is determined that the cable force attenuation exceeds the allowable range, and a second adjustment tensioning command is generated, which instructs the cable jack to perform supplementary tensioning operation to compensate for the cable force loss and ensure that the final cable force of the stay cable meets the design requirements; when the cable force loss value is less than or equal to the cable force loss trigger threshold, it is determined that the cable force attenuation is within the allowable range, and no supplementary tensioning operation is required.

[0067] S41. The control parameters also include an elevation loss trigger threshold, and the pressure holding stage further includes: Obtain the stable elevation value during the pressure holding stage, obtain the measured elevation value at the end of the pressure holding stage, obtain the elevation loss value based on the stable elevation value and the measured elevation value, and obtain the second elevation adjustment command based on the elevation loss value and the elevation loss trigger threshold. The second elevation adjustment command is to adjust the basket to a preset elevation.

[0068] The elevation loss trigger threshold is a preset control parameter used to determine whether the elevation loss during the pressure holding stage exceeds the allowable range. The method for obtaining the stable elevation value during the pressure holding stage is the same as the method for obtaining the stable cable force value: when the pressure holding time reaches 50%, at least 10 sets of elevation data are continuously collected, and the arithmetic mean is taken after removing outliers as the stable elevation value during the pressure holding stage. The measured elevation value at the end of the pressure holding stage is the elevation data collected at the moment when the pressure holding time expires.

[0069] The formula for calculating elevation loss is: In the formula, To stabilize the elevation value during the pressure holding phase, The measured elevation value is used to indicate the end of the pressure holding period.

[0070] When the elevation loss value is greater than the elevation loss trigger threshold, it is determined that the elevation attenuation exceeds the allowable range, and a second elevation adjustment command is generated, which instructs the elevation adjustment mechanism of the hanging basket to drive the hanging basket to rise and fall until the elevation of the front end of the hanging basket reaches the preset elevation; when the elevation loss value is less than or equal to the elevation loss trigger threshold, it is determined that the elevation attenuation is within the allowable range, and no elevation adjustment operation is required.

[0071] This step achieves dual closed-loop control of cable force and elevation during the pressure holding stage by simultaneously monitoring cable force loss and elevation loss, thereby further ensuring construction quality.

[0072] S42. The preset pressure holding time is expressed by the following formula: ,in, Basic pressure holding time, This is a duration correction factor. The rated cable force, Design cable forces for stay cables; The basic pressure holding time The value must be appropriate for the type of anchorage used in the stay cable. For wedge-type anchorages, The value range is 15-20 minutes; for anchorages at the pier head, The value range is 10 to 15 minutes, and its core function is to ensure that the anchorage completes the initial anchoring.

[0073] The duration correction coefficient The value range is 0.8 to 1.2. The larger the ratio of the design cable force to the rated cable force, the better. A larger value allows for better adaptation to pressure-holding requirements under different stress conditions. The rated cable force... This is taken from the product performance specifications of the stay cable, and represents the maximum allowable force value of the stay cable.

[0074] The formula for calculating the preset pressure holding time is: The core logic of this calculation formula is that the pressure holding time increases with the increase of the ratio of the design cable force to the rated cable force, so as to ensure that the stress of the cable is fully relaxed under high stress conditions and improve the anchorage stability.

[0075] S43. The cable stress loss value is expressed by the following formula: The cable force loss value is equal to the difference between the stable cable force value and the measured cable force value. The larger the difference, the more severe the cable force attenuation during the pressure holding stage. To stabilize the cable force value during the pressure holding phase, The measured cable force value is used to conclude the pressure holding process. When the cable force loss value exceeds the cable force loss trigger threshold, a second adjustment tensioning command is generated. The target cable force of the second adjustment tensioning command is expressed by the following formula: ,in, To compensate for the target tension of the stay cable, its core function is to compensate for the tension loss during the pressure holding stage on the basis of the design tension of the stay cable, so as to ensure that the tension of the stay cable is stable at the design tension value after the tensioning is completed.

[0076] S44. The method of maintaining the jack posture for no less than the preset pressure holding time includes: S441. Calculate the standard deviation of cable force during the pressure holding stage, expressed by the following formula: Where m represents the number of data collections during the pressure holding phase. Let j be the cable force value. The standard deviation of cable force is the core function of representing the dispersion of cable force data during the pressure holding stage. The larger the value, the more violent the cable force fluctuation, and the less stable the anchorage state of the stay cable has been.

[0077] The value of the sampling frequency *m* during the pressure holding phase is matched with the pressure holding duration, and is set at a frequency of one set of data per minute, i.e., *m* equals the preset pressure holding duration in minutes. The *j*th cable force value... The cable force data collected at minute j during the pressure holding phase, the average cable force... The arithmetic mean of m sets of cable force data is calculated using the following formula: .

[0078] S442. Expressed as a calculation formula: ,in, Let j be the elevation value. The elevation average value and the elevation standard deviation are used to characterize the dispersion of elevation data during the pressure holding stage. The larger the value, the more drastic the elevation fluctuation at the front end of the hanging basket, and the less stable the support state of the hanging basket has been.

[0079] The j-th elevation value The elevation data collected at minute j during the pressure holding phase, the average elevation value... The arithmetic mean of m sets of elevation data is calculated using the following formula: .

[0080] S443. Set the cable force fluctuation threshold and the elevation fluctuation threshold. When the cable force standard deviation is greater than the cable force fluctuation threshold or the elevation standard deviation is greater than the elevation fluctuation threshold, extend the pressure holding time by a preset ratio.

[0081] The cable force fluctuation threshold and the elevation fluctuation threshold are preset control parameters. The cable force fluctuation threshold ranges from 0.3 to 0.5 kN, and the elevation fluctuation threshold ranges from 0.3 to 0.5 mm. The specific values ​​need to be determined in conjunction with the construction accuracy requirements.

[0082] When the standard deviation of cable force exceeds the cable force fluctuation threshold or the standard deviation of elevation exceeds the elevation fluctuation threshold, it is determined that the anchorage state of the stay cable or the support state of the hanging basket has not reached stability, and the pressure holding time needs to be extended by a preset percentage. The preset percentage ranges from 20% to 50%, and the greater the fluctuation, the higher the preset percentage.

[0083] The extended holding time is calculated as follows: ,in, To extend the pressure holding time, The pressure holding time is extended proportionally. The core purpose of extending the pressure holding time is to provide sufficient stabilization time for the stay cables and hanging baskets. The pressure holding stage is ended only after the cable force and elevation standard deviation drop below the threshold, thus avoiding subsequent cable force loss and elevation deviation due to unstable conditions.

[0084] Example 2 Reference Figure 4 This embodiment provides an intelligent tension detection system for stay cables of a cable-stayed basket, comprising: The parameter acquisition module is configured to acquire preset design parameters and control parameters. The design parameters include the design elevation of the main beam and the design cable force of the stay cables. The control parameters include the allowable deviation threshold for elevation, the allowable deviation threshold for cable force, and the trigger threshold for cable force loss. The data processing module is configured to acquire elevation data at the front end of the hanging basket and pressure data collected by the pressure sensor at the bottom of the jack, correct the elevation data, convert the pressure data into cable force data and correct the cable force data, obtain the elevation deviation based on the elevation data and the design elevation of the main beam, and obtain the cable force deviation based on the cable force data and the design cable force of the stay cables. The instruction generation module is configured to obtain a first elevation adjustment instruction based on the elevation deviation and the allowable elevation deviation threshold, wherein the first elevation adjustment instruction is to instruct the hanging basket to adjust to a preset elevation; and to obtain a first tension adjustment instruction based on the cable force deviation and the allowable cable force threshold, wherein the first tension adjustment instruction is to instruct the cable jack to adjust the tension of the cable. The tensioning module is configured to maintain the jack posture for a period of time not less than a preset holding time, the preset holding time being the duration of the holding phase; acquire the stable cable force value during the holding phase; acquire the measured cable force value at the end of the holding phase; acquire the cable force loss value based on the stable cable force value and the measured cable force value; and obtain a second tensioning adjustment command based on the cable force loss value and the cable force loss trigger threshold. The second tensioning adjustment command is to instruct the cable jack to adjust the tension of the cable.

[0085] A computer-readable storage medium storing a plurality of instructions adapted for loading and execution by a processor of a terminal device, the aforementioned intelligent tension detection method for a cable-stayed basket.

[0086] A terminal device includes a processor and a computer-readable storage medium, the processor being used to implement various instructions; the computer-readable storage medium being used to store multiple instructions, the instructions being adapted to be loaded and executed by the processor to provide a method for intelligent detection of tensioning of a cable-stayed basket cable.

[0087] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media containing computer-usable program code, including but not limited to disk storage, CD-ROM, optical storage, etc.

[0088] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0089] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0090] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0091] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0092] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from the scope of the invention. The spirit and scope of the invention are as follows: Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

[0093] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for intelligent detection of tension in cable-stayed baskets, characterized in that, include: Obtain preset design parameters and control parameters. The design parameters include the design elevation of the main beam and the design cable force of the stay cables. The control parameters include the allowable deviation threshold for elevation, the allowable deviation threshold for cable force, and the trigger threshold for cable force loss. The system acquires elevation data at the front end of the hanging basket and pressure data collected by pressure sensors at the bottom of the jacks. It corrects the elevation data, converts the pressure data into cable force data and corrects the cable force data. It obtains the elevation deviation based on the elevation data and the design elevation of the main beam, and obtains the cable force deviation based on the cable force data and the design cable force of the stay cables. The first elevation adjustment command is obtained based on the elevation deviation and the allowable elevation deviation threshold. The first elevation adjustment command is to instruct the hanging basket to adjust to the preset elevation. The first tension adjustment command is obtained based on the cable force deviation and the allowable cable force deviation threshold. The first tension adjustment command is to instruct the cable jack to adjust the tension of the cable. Maintain the jack posture for no less than a preset pressure holding time, where the preset pressure holding time is the duration of the pressure holding phase. Obtain the stable cable force value during the pressure holding phase, obtain the measured cable force value at the end of the pressure holding phase, obtain the cable force loss value based on the stable cable force value and the measured cable force value, and obtain a second adjustment tensioning command based on the cable force loss value and the cable force loss trigger threshold. The second adjustment tensioning command is to instruct the cable jack to adjust the tension of the cable.

2. The intelligent tension detection method for stay cables of a cable-stayed basket according to claim 1, characterized in that, The control parameters also include an elevation loss trigger threshold, and the pressure holding stage further includes: Obtain the stable elevation value during the pressure holding stage, obtain the measured elevation value at the end of the pressure holding stage, obtain the elevation loss value based on the stable elevation value and the measured elevation value, and obtain the second elevation adjustment command based on the elevation loss value and the elevation loss trigger threshold. The second elevation adjustment command is to adjust the basket to a preset elevation.

3. The intelligent tension detection method for stay cables of a cable-stayed basket according to claim 1, characterized in that, The formula for calculating the cable force loss trigger threshold is: ,in, Design cable force for stay cables, The elevation loss trigger threshold is defined by the following formula: (This is the cable force loss coefficient) ,in, Calculate the length of the cable. This is the elevation loss coefficient.

4. The intelligent tension detection method for stay cables of a cable-stayed basket according to claim 1, characterized in that, The correction of elevation data includes: The ionospheric delay correction is calculated based on the satellite elevation angle and expressed by the following formula: ,in, For the satellite elevation angle, This is the first correction factor; The tropospheric delay correction is calculated based on elevation data and expressed by the following formula: ,in, This refers to the elevation data of the front end of the hanging basket. This is the second correction factor. This is the third correction factor; The multipath error correction is calculated using a moving average filtering algorithm, expressed as follows: ,in, To adjust the sliding window size, This represents the average elevation within the window. This represents the j-th elevation data point within the sliding window; The corrected elevation data are as follows: ; The elevation deviation is: ,in, The design elevation of the main beam.

5. The intelligent tension detection method for stay cables of a cable-stayed basket according to claim 1, characterized in that, The process of converting pressure data into cable force data and correcting the cable force data includes: The pressure data was calibrated by applying loads in stages according to a preset load gradient, obtaining the sensor output voltage and standard cable force value, and establishing the calibration equation using the least squares method, expressed as: ,in , n is the number of load levels. The sensor output voltage, This is the standard cable tension value. The sensor outputs voltage in real time during the tensioning process. These are the initial cable force data after calibration; Temperature correction is performed based on changes in ambient temperature and the elastic modulus of the cable, expressed by the following formula: ,in, Let A be the linear expansion coefficient of the cable, and A be the cross-sectional area of ​​the cable. Due to changes in ambient temperature, For the elastic modulus of the cable, This is the temperature correction amount for cable tension; The corrected cable tension data is as follows: ,in, The cable tension data is after temperature correction. The cable force deviation is: ,in, Design the cable force for the stay cables.

6. The intelligent tension detection method for stay cables of a cable-stayed basket according to claim 1, characterized in that, The correction of the cable force data also incorporates dynamic adjustments to the concrete pouring volume, setting a pouring volume ratio, which is expressed by the following formula: ,in, This refers to the proportion of the pouring volume. This represents the actual amount poured. The revised calculation formula for the stage design pouring volume is as follows: , The coefficient representing the influence of the pouring volume is denoted as , where . This is the final cable force data after temperature correction and pouring volume adjustment.

7. The intelligent tension detection method for stay cables of a cable-stayed basket according to claim 1, characterized in that, The execution of the first tensioning adjustment command is force gradient tensioning, which includes: Set the target cable force at the first strength level. Second strength level target cable force and the third-level force target cable force ,satisfy The first cable force increment is obtained based on the target cable force at each level. Second cable force increment Expressed as a calculation formula: , ,and ; The current force level is determined based on the elevation deviation and cable tension deviation, including: when or At that time, the first level of loading operation is executed, and the increment of cable force applied in a single operation is... ,in, For elevation deviation, For cable force deviation, This is the allowable elevation deviation threshold. The allowable deviation threshold for cable tension. This is the first deviation grading coefficient; when or At that time, the second-level loading operation is executed, and the increment of the cable force applied in a single operation is... ,in, This is the second deviation grading coefficient. The force attenuation coefficient, when and At that time, the third-level loading operation is executed, and the increment of the cable force applied in a single operation is... ; After each force level is loaded, maintain a preset stable time, re-collect data and calculate the elevation deviation and cable force deviation until the deviations all meet the corresponding threshold requirements.

8. The intelligent tension detection method for stay cables of a cable-stayed basket according to claim 1, characterized in that, The preset pressure holding time is expressed by the following formula: ,in, Basic pressure holding time, This is a duration correction factor. The rated cable force, Design cable forces for stay cables; The cable stress loss value is expressed by the following formula: ,in, To stabilize the cable force value during the pressure holding phase, The measured cable force value is used to indicate the end of the pressure holding period; When the cable stress loss value exceeds the cable stress loss trigger threshold, a second tension adjustment command is generated. The target cable stress of the second tension adjustment command is expressed by the following formula: ,in, To compensate for the tension of the target cable.

9. The intelligent tension detection method for stay cables of a cable-stayed basket according to claim 1, characterized in that, Maintaining the jack posture for no less than the preset pressure holding time includes: The standard deviation of cable force during the pressure holding stage is calculated using the following formula: Where m represents the number of data collections during the pressure holding phase. Let j be the cable force value. This represents the average cable force. Expressed as a calculation formula: ,in, Let j be the elevation value. This is the average elevation value; Set cable force fluctuation threshold and elevation fluctuation threshold. When the standard deviation of cable force is greater than the cable force fluctuation threshold or the standard deviation of elevation is greater than the elevation fluctuation threshold, extend the pressure holding time by a preset ratio.

10. A tensioning intelligent detection system for cable-stayed baskets, characterized in that, The intelligent tension detection method for stay cables of a cable-stayed basket according to any one of claims 1-9 includes: The parameter acquisition module is configured to acquire preset design parameters and control parameters. The design parameters include the design elevation of the main beam and the design cable force of the stay cables. The control parameters include the allowable deviation threshold for elevation, the allowable deviation threshold for cable force, and the trigger threshold for cable force loss. The data processing module is configured to acquire elevation data at the front end of the hanging basket and pressure data collected by the pressure sensor at the bottom of the jack, correct the elevation data, convert the pressure data into cable force data and correct the cable force data, obtain the elevation deviation based on the elevation data and the design elevation of the main beam, and obtain the cable force deviation based on the cable force data and the design cable force of the stay cables. The instruction generation module is configured to obtain a first elevation adjustment instruction based on the elevation deviation and the allowable elevation deviation threshold, wherein the first elevation adjustment instruction is to instruct the hanging basket to adjust to a preset elevation; and to obtain a first tension adjustment instruction based on the cable force deviation and the allowable cable force threshold, wherein the first tension adjustment instruction is to instruct the cable jack to adjust the tension of the cable. The tensioning module is configured to maintain the jack posture for a period of time not less than a preset holding time, the preset holding time being the duration of the holding phase; acquire the stable cable force value during the holding phase; acquire the measured cable force value at the end of the holding phase; acquire the cable force loss value based on the stable cable force value and the measured cable force value; and obtain a second tensioning adjustment command based on the cable force loss value and the cable force loss trigger threshold. The second tensioning adjustment command is to instruct the cable jack to adjust the tension of the cable.

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