CN-121980647-A - Steel pipe concrete arch bridge cable-stayed buckling construction method based on digital twin system

Abstract

The invention provides a steel pipe concrete arch bridge cable-stayed buckling construction method based on a digital twin system, which comprises the steps of constructing accurate three-dimensional models such as a bridge completion model, a hoisting tower and the like, realizing digital pre-assembly by combining three-dimensional laser scanning, and simulating key construction stages to generate animation demonstration; the method comprises the steps of deploying a high-definition camera and a sensor network on a construction site, acquiring data in real time by means of video measurement, dynamically calibrating the construction by a digital twin system, tracing the whole flow of materials by adopting a two-dimensional code or an RFID label, visually monitoring the construction progress, optimizing resource allocation according to indexes such as stress and displacement, intersecting the materials by a three-dimensional visual technology, designing an intuitive interface, defining a protocol to realize system butt joint, and ensuring safety by using a double-tower three-span cable crane system in cooperation with double-star double-system positioning and cable force monitoring during construction. The method can realize accurate construction control and risk early warning management, optimize resource allocation, improve construction efficiency and quality, and provide data support for bridge construction and operation and maintenance.

Inventors

• ZHANG TAO
• TANG XINHUA
• LIU YUDONG
• YIN CONG
• LONG ZEMING
• ZHAO GAOJIE
• LIANG DONG
• MA JIAJUN
• LI LINGFENG
• XIE KAIZHONG
• LI YONGLIANG
• ZHANG CHUNHAO
• LI FEI
• CHEN YONGGUI
• ZHANG YUANPENG
• WEI LEI

Assignees

• 中铁二十五局集团第四工程有限公司
• 中铁二十五局集团有限公司
• 广西大学

Dates

Publication Date

20260505

Application Date

20260104

Claims (6)

1. 1. The cable-stayed buckling construction method of the steel tube concrete arch bridge based on the digital twin system is characterized by comprising the following steps of: The method comprises the steps of establishing a digital model and pre-assembling, namely establishing a parameterized three-dimensional model comprising a bridge finishing state, a hoisting tower, a tower crane and a steel structure processing plant by using professional three-dimensional modeling software, adopting three-dimensional laser scanning to perform millimeter-level scanning on steel pipe arch rib sections, cable-stayed buckling ropes and key nodes to generate a point cloud model, pre-assembling the point cloud model and the parameterized three-dimensional model in a virtual environment with an error less than or equal to 2mm to form a digital twin pre-assembling model, and outputting component processing and installation adjustment instructions; Step two, the whole construction process simulation and construction scheme optimization are carried out, namely, using construction simulation software, taking the digital twin pre-assembled model obtained in the step one as input, carrying out full coupling simulation on key construction stages of main body completion, arch rib hoisting, concrete pouring and bridge deck installation, and generating interactive three-dimensional animation demonstration; the construction simulation software automatically outputs the optimized construction process, operation points and visual bottoming files based on simulation and real-time interaction results, and is used for guiding subsequent site construction; the method comprises the steps of on-site sensing and dynamic calibration, namely, deploying an industrial-level high-definition camera, a binocular vision system and a sensor network consisting of a strain gauge, a stay wire displacement meter and a temperature and wind speed sensor on a construction site, acquiring on-site image data and stress, displacement and temperature index data in real time by using a video measurement technology, transmitting the data to a digital twin system, comparing an internal digital twin model with on-site actual measurement data by the digital twin system, dynamically adjusting the output of stretching equipment by adopting a 'double-circulation correction mechanism', and realizing millimeter-level dynamic consistency calibration of the model and on-site state; Step four, a component full period tracing step, in which two-dimensional codes and RFID double labels are synchronously bound for each component in the production stage of the steel structural component, geometric parameters, production batches and quality data are related to a digital twin platform in real time, in the transportation process, component position information is continuously uploaded through a GPS terminal, when in-situ inspection, quality inspection personnel scan or sense the labels to complete arrival inspection, and the result is returned to a digital twin system in real time, when the three-dimensional scanning detects that the elastic modulus deviation of the component batches exceeds a set threshold value, the digital twin system automatically triggers dynamic correction of a tensioning compensation coefficient, so that traceability and self-adaptive regulation of the whole process from production, transportation to installation are realized; The construction progress plan is imported into a digital twin system and is associated with a digital twin model, actual progress data of a construction site is collected in real time, the progress of the project is displayed through a visual progress chart in comparison with the planned progress; The three-dimensional visualization technology bottoming and double-tower three-span cable crane and double-star positioning steps comprise carrying out three-dimensional visualization technology bottoming through a three-dimensional visualization bottoming platform supporting LED large screens, touch control and VR head-mounted display, guaranteeing that constructors accurately master process points, reducing errors, facilitating management personnel to monitor project progress in real time, achieving a man-machine interaction function, defining a system structure diagram and a data docking protocol, enabling a digital twin system to be in seamless docking with other construction management systems, carrying out component installation by applying a double-tower three-span cable crane system in construction, fusing Beidou second-generation and GPS double-star double-system RTK positioning, monitoring three-dimensional coordinates of hanging points in real time, installing a high-precision cable sensor at the end of a cable-stayed buckle, acquiring data in real time, transmitting the data to the digital twin system, automatically triggering a compensation tensioning mechanism when the pressure difference of two-bank oil pumps is larger than 0.5 MPa and the deviation of upstream cable force and downstream cable force is larger than 3%, dynamically adjusting tensioning parameters, and guaranteeing that the installation height difference of arch rib segments is stably controlled within 5mm through the closed-loop control flow.
2. 2. The method for constructing the cable-stayed buckling of the steel tube concrete arch bridge based on the digital twin system according to claim 1, wherein the digital twin pre-assembly comprises the following steps: adopting a Z+F5010 series ground three-dimensional laser scanner to perform millimeter-level scanning on the steel pipe arch rib section, the cable-stayed buckling cable and the key nodes, and sequentially completing scanning station layout, multi-station multi-angle data acquisition, point cloud splicing, point cloud denoising and point cloud simplification to obtain a high-precision point cloud model; in a virtual environment, matching and aligning the characteristic points of the point cloud model and a parameterized three-dimensional model comprising a bridge finishing state, a hoisting tower, a tower crane and a steel structure processing plant, wherein the alignment error is less than or equal to 2mm; Then, performing precision analysis, calculating global distance deviation of the point cloud model and the parameterized three-dimensional model, generating a deviation chromatogram, and mainly analyzing the connection node, the weld joint reserved quantity and the coordinate deviation of the buckling cable anchoring point; And automatically generating component processing correction quantity and on-site installation adjustment instruction according to a deviation analysis result, and synchronously updating the digital twin model to form the digital twin pre-assembly model capable of guiding subsequent manufacture and erection.
3. 3. The method for constructing the cable-stayed buckling of the steel tube concrete arch bridge based on the digital twin system according to claim 1, wherein the whole construction process is simulated in the second step, and the method specifically comprises the following steps: firstly, digital twin model construction and scheme planning are carried out in the design stage: Carrying out three-dimensional modeling and parameterization design, constructing a full-parameterization digital twin model of the steel pipe concrete arch bridge by using BIM technology, wherein the model comprises key components such as arch ribs, cable-stayed buckling ropes, anchors and buckling towers, accurately mapping the geometric dimension, material attribute and connection node details of the key components, and integrating construction load and environmental load boundary conditions; Carrying out construction working condition simulation and tensioning scheme design, determining initial tension force through finite element calculation, eliminating a cable buckling loosening error, verifying the matching property of an anchor and a cable body, dividing the total tension force into 5 stages, gradually increasing the total tension force by 20%, simulating the influence of each stage of tensioning on arch rib linearity and stress distribution, avoiding local stress concentration, and setting synchronous tensioning sequences of left and right banks, upstream and downstream cable buckling based on the arch rib symmetry; Then, the component with digital twin driving is prefabricated in the processing and manufacturing stage: the method comprises the steps of guiding out processing parameters of a steel pipe segment based on a digital twin model, carrying out digital processing, adopting digital cutting equipment to process a steel pipe arch rib segment, and controlling the precision within +/-2 mm; Integrating the intelligent component identification and data, implanting an RFID chip or a two-dimensional code into each component, storing geometric parameters, material detection reports and processing batch information of the components, and binding the components with a digital twin model; finally, carrying out digital twin-guided construction and tensioning control in the field assembly stage: Establishing a field BIM+GIS management platform, linking a digital twin model with a total station and a GNSS positioning system in real time, realizing millimeter-level control of hoisting and positioning of arch rib sections, arranging strain gauges, inclinometers and temperature sensors on the top of a buckling tower and key sections of the arch ribs, and acquiring data in real time and synchronizing the data to the digital twin system; then, carrying out the operation of installing and pretensioning a cable-stayed buckling system, carrying out the buckling cable installation, hoisting arch rib sections according to the planning sequence of a digital twin model, temporarily fixing and then connecting the buckling cable, ensuring that the deviation between the axis of the cable body and the preset path of the model is less than or equal to 5mm, and carrying out pretensioning, graded tensioning and symmetrical tensioning; pretension, utilizing the real-time simulation function of a digital twin system, controlling pretension to be 10% -15% of a design value, synchronously monitoring arch rib linear change, automatically adjusting pretension of each buckling rope through the system, and eliminating installation errors; Step tensioning, namely, 1-level tensioning is carried out according to 20% of design force, two shore buckling cable oil pumps are synchronously started according to the tensioning sequence generated by a digital twin system, each level of tensioning is separated by 15 minutes, data are collected after stress is stabilized, the middle level of tensioning is carried out according to 40% -80% of design force, the digital twin system compares actual measurement strain with simulation value after each level of tensioning, the next level of tensioning increment is automatically adjusted if the actual measurement strain exceeds a threshold value, the final tensioning is carried out according to 100% of design force, the load is maintained for 30 minutes after the design tensioning force is achieved, the arch rib closure section Gao Cha mm is verified through the digital twin system, and otherwise, a compensation tensioning mechanism is started; And finally tensioning, wherein a principle of synchronous two-shore and symmetric upstream and downstream is adopted, the pressure difference of the two-shore tensioning oil pump is less than or equal to 0.5MPa, the deviation of the upstream and downstream cable force is less than or equal to 3 percent, once the deviation of tensioning data on two sides exceeds the allowable range, the system immediately sends out early warning, the operation parameters of tensioning equipment are automatically adjusted, the accuracy of symmetric tensioning is ensured, and the stability and the safety of the bridge structure in the tensioning process are ensured.
4. 4. The method for constructing the cable-stayed buckling of the steel tube concrete arch bridge based on the digital twin system as claimed in claim 1, wherein the third step specifically comprises the following steps: Firstly, arranging camera equipment, installing industrial-level high-definition cameras in high-precision required areas such as arch rib butt joint nodes and stay cable anchoring areas, adopting a binocular vision system in a main arch rib hoisting dynamic process, realizing frame synchronization between two cameras by 60cm, and acquiring three-dimensional coordinates of a component in real time by utilizing a parallax principle through a synchronous triggering device; the sensor arrangement is carried out, strain gauges can be stuck to key structural parts such as arch rib feet, 1/4 span, vault and tower top, structural stress is monitored in real time, a stay wire displacement meter is installed at a buckling cable anchoring point, displacement change in the tensioning process is recorded, and temperature and wind speed sensors are arranged on a construction site to provide environmental parameters for hoisting operation; The method comprises the steps of carrying out video measurement, extracting data, carrying out real-time processing on video streams by an edge computing server, extracting data by an image processing algorithm, adopting edge detection and Hough transformation to calculate the size and deviation for static components, tracking the motion track, displacement and attitude angle parameters of dynamic hoisting components by a binocular vision system, calculating the number of installed components by combining a panoramic image with a deep learning algorithm, and calculating the construction progress completion rate; The data collected by the sensor is transmitted to a field data collection terminal through an industrial bus or a wireless LoRa module, the terminal carries out preliminary filtration on the data, and then the data is transmitted to a digital twin system through a 5G private network in real time, and the end-to-end transmission delay is controlled within 50 ms; Then, carrying out data processing and docking with a digital twin system, preprocessing video data and sensor data by an edge computing terminal, and extracting key characteristic parameters by denoising, enhancing and distortion correction of the video data; The method comprises the steps of interfacing with a digital twin system, converting geometric parameters and state information extracted from video data into a JSON format, converting sensor data into a CSV format, ensuring that the geometric parameters and the state information are in accordance with the data specification of the digital twin system and are converted into a bridge construction coordinate system through known control points of a construction site, controlling conversion errors within +/-1 mm, enabling a digital twin model to be consistent with the spatial position of a physical site, updating the state of a virtual model in real time after the digital twin system receives the data, mapping the actual position, stress value and temperature data of arch ribs onto the virtual member, and intuitively displaying the structural state through color coding; Finally, carrying out data analysis and construction parameter dynamic adjustment, comparing the number of the installed components, the finishing procedure and the construction plan of video identification by a digital twin system to obtain a progress deviation rate, further grasping the progress, comparing the stress monitored by a sensor, the displacement data and the dimensional deviation measured by the video with a design threshold value, analyzing and adjusting the part exceeding the threshold value, and evaluating the safety risk of a construction site by fusing wind speed data, and introducing a double-circulation correction mechanism to realize the dynamic consistency calibration of a model and a site state on the basis: the external circulation is that the stress and displacement data actually measured by the sensor are compared with the simulation value every 30 minutes, if any index is more than 10%, the elastic modulus, the poisson ratio, the boundary constraint condition and the load distribution key parameters of the trigger model material are corrected, and the error is reduced; internal circulation, namely based on real-time sensor data, real-time adjusting the tension force, and adopting a PID control algorithm: , wherein, In order to control the output of the device, For the deviation of the measured value from the target value, The output of the stretching equipment is dynamically adjusted, 、 、 And the dynamic consistency calibration of the model and the on-site state is realized by dynamically adjusting the output of the tensioning equipment respectively in proportion, integral and differential coefficients.
5. 5. The method for constructing the cable-stayed buckling of the steel tube concrete arch bridge based on the digital twin system as claimed in claim 1, wherein the fourth step specifically comprises the following steps: Firstly, before a component leaves a factory, pasting a PVC material which is oil-resistant and high-low temperature resistant and contains information two-dimensional code labels on a component easy-scanning position through strong glue, fixing an RFID label which is internally provided with a chip and stores information consistent with the two-dimensional code by bolts, synchronously binding two-dimensional code and RFID double labels for each component in the production stage of the steel structural component, and relating geometric parameters, production batch and quality detection data of the component to a digital twin platform in real time to ensure that the identity of the component is unique and the information is complete; The method comprises the steps that logistics real-time updating and data acquisition are carried out, after a component is produced in a processing plant, a worker code scanning system automatically records line time and quality inspector information, production data are associated to a digital twin model, a warehouse manager synchronously records logistics delivery time and license plate number of a transport vehicle and installs a GPS positioning terminal on the vehicle, real-time position information in the component transportation process is continuously uploaded, after the component arrives at a site, quality inspectors complete arrival verification by scanning two-dimension codes or induction RFID labels, whether the material information and arrival bill meet design requirements is checked, and acceptance results are returned to the digital twin system in real time; And finally, carrying out material visualization on a digital twin system, marking material states with different colors in the digital twin platform, carrying out real-time statistics on site inventory by the system, automatically pushing a replenishment reminder to a processing plant when the inventory is lower than an early warning threshold, and simultaneously, if the three-dimensional scanning detects that the elastic modulus deviation of a certain component batch exceeds a set threshold, automatically triggering the dynamic correction of a tensioning compensation coefficient by the digital twin system to realize self-adaptive regulation, wherein the whole process from production and transportation to installation of the material is traceable and the state is monitorable, thereby providing accurate data support for construction progress management and control, quality tracing and dynamic optimization of construction parameters and effectively reducing construction period loss and structural risk caused by material error, delay or performance deviation.
6. 6. The method for constructing the cable-stayed buckling of the steel tube concrete arch bridge based on the digital twin system according to claim 1, wherein the three-dimensional visualization technique of the step six is intersected, and the method comprises the following steps: firstly, refining a construction model process, carrying out local amplification and detail supplement on a model of a key construction link, splitting a continuous construction process into a plurality of key steps, manufacturing step-by-step animation, matching with voice explanation, and superposing construction parameter labels in the model; The interactive function is realized, the constructor is supported to switch the visual angle through a mouse, a touch screen or VR equipment, the simulation scene of common misoperation is added, the risk awareness of the constructor is enhanced, the interactive hot spot is arranged in the model, and the corresponding operation manual, video tutorial and quality inspection standard can be popped up by clicking any procedure step; Then, before-mating training is carried out, mating contents are customized for different groups according to job classification, a visual mating room is arranged on a construction site, and an LED screen, a VR experience area and a touch control operation desk are arranged; The constructor freely switches visual angles and repeatedly exercises through touch control or VR equipment, and the system receives interactive instructions in real time and feeds back corresponding operation manuals and quality inspection standards to complete interactive bottoming; The double-tower three-span cable crane and double-star positioning method comprises the following steps: Firstly, a complete double-tower three-span cable hoisting system is established in a bridge construction area, beidou/GPS dual-mode high-precision receivers are installed at key positions of a main cable tower, a hoisting point and arch rib sections to form a positioning monitoring network for covering a full bridge, and meanwhile, cable sensors with the precision reaching 0.1% FS are installed at the end parts of cable-stayed buckles, and pressure sensors are arranged at tension oil pumps to construct a multi-dimensional monitoring system comprising positioning, force measurement and pressure measurement; the digital twin system processes the double-star positioning data in real time at the frequency of 10Hz, accurately tracks the three-dimensional coordinates of the hanging points, simultaneously fuses and analyzes cable force and pressure data, immediately triggers a compensation tensioning mechanism when the intelligent diagnosis of the digital twin system finds that the pressure difference of the oil pumps on two sides is more than 0.5MPa and the deviation of the upstream cable force and the downstream cable force exceeds 3%, and dynamically adjusts the output of tensioning equipment according to the deviation of an actual measurement value and a target value by adopting a self-adaptive PID control algorithm, so that the accurate closed-loop control of the cable force is realized.

Description

Steel pipe concrete arch bridge cable-stayed buckling construction method based on digital twin system Technical Field The invention belongs to the technical field of cable-stayed buckling construction of a steel tube concrete arch bridge, and particularly relates to a cable-stayed buckling construction method of a steel tube concrete arch bridge based on a digital twin system. Background In the field of traditional bridge construction, the problems of complex structure design and construction, high-precision installation requirement, safety management of construction sites and the like are always key factors for restricting industry development, and along with the continuous increase of bridge construction scale and difficulty, the traditional construction method gradually reveals limitations when coping with the challenges. The digital twin technology brings new opportunities for bridge construction, and the intelligent and visual control of the construction process can be realized by constructing a virtual model with the height consistent with that of a physical entity and integrating multi-source perception big data from a construction site. However, how to deeply integrate the digital twin technology into the whole bridge construction process more efficiently at present, from design conception, specific construction operation and later operation and maintenance management, seamless connection and optimization of each stage are realized, and the key problem to be overcome in the field of bridge construction is still urgent. Disclosure of Invention Aiming at the problems existing in the prior art, the invention provides a cable-stayed buckling construction method of a steel tube concrete arch bridge based on a digital twin system, which adopts the following scheme: A cable-stayed buckling construction method of a steel tube concrete arch bridge based on a digital twin system comprises the following steps: The method comprises the steps of establishing a digital model and pre-assembling, namely establishing a parameterized three-dimensional model comprising a bridge finishing state, a hoisting tower, a tower crane and a steel structure processing plant by using professional three-dimensional modeling software, adopting three-dimensional laser scanning to perform millimeter-level scanning on steel pipe arch rib sections, cable-stayed buckling ropes and key nodes to generate a point cloud model, pre-assembling the point cloud model and the parameterized three-dimensional model in a virtual environment with an error less than or equal to 2mm to form a digital twin pre-assembling model, and outputting component processing and installation adjustment instructions; Step two, the whole construction process simulation and construction scheme optimization are carried out, namely, using construction simulation software, taking the digital twin pre-assembled model obtained in the step one as input, carrying out full coupling simulation on key construction stages of main body completion, arch rib hoisting, concrete pouring and bridge deck installation, and generating interactive three-dimensional animation demonstration; the construction simulation software automatically outputs the optimized construction process, operation points and visual bottoming files based on simulation and real-time interaction results, and is used for guiding subsequent site construction; The method comprises the steps of setting up an industrial-level high-definition camera, a binocular vision system and a sensor network consisting of a strain gauge, a stay wire displacement meter, a temperature sensor and a wind speed sensor on a construction site, acquiring field image data and stress, displacement and temperature index data in real time by using a video measurement technology, transmitting the field image data and the stress, displacement and temperature index data to a digital twin system, comparing an internal digital twin model with field actual measurement data by the digital twin system, dynamically adjusting tensioning equipment output by adopting a 'double-circulation correction mechanism', realizing millimeter-level dynamic consistency calibration of the model and the field state, and realizing the component full-period tracing step, namely synchronously binding a two-dimensional code and an RFID double-label for each component in a steel structural component production stage, and continuously uploading component position information through a GPS terminal in the transportation process, completing cargo checking by a quality inspector scanning or sensing label in the transportation process, and transmitting the result back to the digital twin system in real time, and automatically triggering dynamic correction of a tensioning compensation coefficient by the digital twin system when the three-dimensional scanning detects that the component elastic modulus deviation exceeds a set threshold value; The construction progress plan is i