Large-span tied arch bridge steel box arch rib construction control method

Abstract

The invention discloses a large-span tied arch bridge steel box arch rib construction control method. The method comprises the steps that a large-span tied arch bridge steel box arch rib section three-dimensional model is established, and arch rib sections are numbered in sequence; performing all-weather continuous monitoring on the arch rib section temperature data room by using mathematical statistics and a comparative analysis method to obtain monitoring data; analyzing an influence rule of natural parameters, steel box arch rib structure attributes and construction parameters on the space time-varying non-uniform temperature field by adopting a heat exchange theory of a bridge structure and an external environment and a bridge structure thermal analysis theory according to the monitoring data and the three-dimensional model; and according to the influence rule, the expected folding time and the position size of a folding opening are determined, the position size of the folding opening is adjusted based on a folding opening adjusting device, and the arch rib section folding construction operation is completed within the expected time. The expected folding time and the folding opening position size are accurately determined, and the construction precision and efficiency are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction control, and particularly to a construction control method for the steel box arch rib of a long-span tied arch bridge. Background Art

[0002] Long-span tied arch bridges mainly adopt steel box arch ribs. During closure, the structural system will change, and the closure error may affect the structural system, which may further cause the permanent load pressure line to deviate from the ideal arch axis, having an adverse impact on the long-term operation of the bridge structure. Investigation and analysis show that the time-varying characteristics of meteorological parameters such as solar radiation, air temperature, and wind speed will inevitably lead to real-time changes in the structural temperature field, resulting in uneven temperature distribution of the arch rib and the existence of temperature differences between the cable and the structure during the cable-hoisting construction process of the arch bridge, thus causing significant temperature deformation. The above meteorological parameters are one of the key reasons for the closure error of long-span tied arch bridges. The arch axis caused by the closure error will make the safety and durability problems of the bridge structure more prominent under complex environments and repeated vehicle loads during the later operation stage.

[0003] In the prior art, during the construction of the steel box arch rib of a long-span tied arch bridge, the influence mechanism of external meteorological factors on the temperature field of the arch rib during the construction stage cannot be revealed, the expected time of closure and the position size of the closure joint cannot be accurately determined, and the construction accuracy and efficiency are low. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the above technologies to some extent. For this purpose, the object of the present invention is to provide a construction control method for the steel box arch rib of a long-span tied arch bridge, which reveals the influence mechanism of external meteorological factors on the temperature field of the arch rib during the construction stage, clarifies the real-time change mechanism of the arch rib linear shape of the long-span tied arch bridge considering the temperature effect, accurately evaluates the influence of temperature on it, and determines the optimal temperature during closure to ensure the safety and durability of the bridge, accurately determine the expected time of closure and the position size of the closure joint, and effectively improve the construction accuracy and efficiency.

[0005] To achieve the above object, an embodiment of the present invention provides a construction control method for the steel box arch rib of a long-span tied arch bridge, including:

[0006] Establish a three-dimensional model of the steel box arch rib segments of the long-span tied arch bridge and sequentially number the arch rib segments;

[0007] Use mathematical statistics and comparative analysis methods to continuously monitor the temperature data of the arch rib segments all-weather to obtain monitoring data;

[0008] According to the monitoring data and three-dimensional model, the heat exchange theory between bridge structure and external environment and the thermal analysis theory of bridge structure are adopted. Based on the time history analysis method and radiation model, the transient thermal analysis method of the spatial time-varying non-uniform temperature field of the steel box arch rib segment under the combined effect of solar radiation, component shielding and ambient temperature is established to analyze the influence of natural parameters, steel box arch rib structure properties and construction parameters on the spatial time-varying non-uniform temperature field.

[0009] The expected closing time and the closing opening position size are determined according to the influencing law, the closing opening position size is adjusted based on the closing opening adjustment device, and the arch rib segment closing construction work is completed within the expected time.

[0010] According to some embodiments of the present invention, the natural parameters include solar radiation, ambient temperature, and wind speed; the steel box arch rib structure properties include steel box arch rib structure dimensions, construction process, displacement, and deformation.

[0011] According to some embodiments of the present invention, a three-dimensional model of a steel box arch rib segment of a long-span tied arch bridge is established and the arch rib segments are numbered in sequence, including:

[0012] Determine the attribute information of the steel box arch rib segment of the long-span tied arch bridge according to the design drawings; the attribute information includes the span, rise, arch axis shape and cross-sectional size of the arch rib segment;

[0013] generating an initial model based on the modeling software according to the attribute information;

[0014] Adding detail features to the initial model to obtain a three-dimensional model; the detail features include stiffeners, connecting plates and sling connection points;

[0015] Each arch rib segment in the 3D model is numbered in sequence based on the preset numbering rule.

[0016] According to some embodiments of the present invention, mathematical statistics and comparative analysis methods are used to continuously monitor the arch rib segment temperature data room around the clock to obtain monitoring data, including:

[0017] Install temperature sensors and data acquisition systems on the arch rib segments to collect temperature data at set time intervals;

[0018] The temperature data is processed and analyzed based on mathematical statistics and comparative analysis to obtain monitoring data.

[0019] According to some embodiments of the present invention, before adjusting the closing opening position size based on the closing opening adjustment device and completing the arch rib segment closing construction operation within the expected time, the arch rib segment closing construction operation is simulated, including:

[0020] Construct the design model of the lower chords on both sides of the closing section of the arch rib segment;

[0021] Measure the actual dimensions of the members on both sides of the closure segment, update the measurement data to the parameter table of the truss arch segment model, and simulate the chord members of the closure segment of the horizontal box girder structure by using the method of clamping and butt-joint connection with internal and external splicing plates; simulate the web members and the diagonal members of the upper and lower horizontal bracings of the closure segment by using the "X" structure respectively.

[0022] According to some embodiments of the present invention, it further includes:

[0023] When carrying out the closure construction operation of the arch rib segments, obtain the shape data and mechanical data of the long-span tied arch bridge;

[0024] Construct a BIM model of the long-span tied arch bridge;

[0025] Input the shape data and mechanical data into the BIM model to monitor the construction progress and construction quality.

[0026] According to some embodiments of the present invention, the shape data includes the shapes and installation positions of the arch seats and arch ribs; the mechanical data includes the force information of the arch ring and supports after the installation of each arch rib segment.

[0027] According to some embodiments of the present invention, the shape data is obtained by a lidar and a scanning device; the mechanical data is obtained by stress and strain sensors.

[0028] According to some embodiments of the present invention, before establishing a transient thermal analysis method for the spatial time-varying non-uniform temperature field of the steel box arch rib segments under the combined action of solar radiation - member occlusion - environmental temperature based on the heat exchange theory between the bridge structure and the external environment and the bridge structure thermal analysis theory according to the monitoring data and the three-dimensional model, and based on the time history analysis method and the radiation model, it further includes: classifying the monitoring data;

[0029] Classifying the monitoring data includes:

[0030] Segment the monitoring data to obtain several pieces of data, and determine the weight coefficients of each piece of data corresponding to each category;

[0031]

[0032] Wherein, is the minimum value for constructing the objective function ; s.t. is the constraint condition; w i,j is the probability that the i-th piece of data corresponds to the j-th category; d i,j is the central distance between the i-th piece of data and the j-th category; p is the number of pieces of data obtained by segmenting the monitoring data; K is the number of categories into which the preset monitoring data is divided into K categories, N * is a set of positive integers;

[0033] Based on the weight coefficients corresponding to each category for each piece of data, data classification is performed to obtain the data classification result.

[0034] According to some embodiments of the present invention, before the construction operation of the closure of the arch rib segments, determine the number of required lifting equipment;

[0035] Determine the number of idle lifting equipment and the closure construction workload;

[0036] Calculate the utilization rate of the lifting equipment;

[0037]

[0038] Among them, η is the utilization rate of the lifting equipment; TP is the lifting capacity of the lifting equipment; N is the number of lifting equipment used for this experiment; ZS is the workload used for this experiment; f is the working frequency of the lifting equipment; b is the closure construction workload that can be completed per unit time; t is the working time of each lifting equipment;

[0039] Calculate the delay of each used lifting equipment;

[0040]

[0041] Among them, T is the maximum working frequency of the lifting equipment; AC is the input clock of the lifting equipment; FW floor(t) is the floor(t) - th value of the Fibonacci sequence; floor( ) is to take the integer of the value in the parentheses, with the value range from 0 to 1; Me is the delay of each used lifting equipment obtained by calculation; λ is an adjustment coefficient, with the value range (0, 1);

[0042] According to the utilization rate of the lifting equipment and the delay of the lifting equipment, use Lagrange for equilibrium solution to determine the number of required lifting equipment;

[0043] min(N*Egz+(ALL - N)*Exx)

[0044]

[0045] Among them, min(N*Egz+(ALL - N)*Exx) is to solve a value N to make the value in the parentheses of min() the smallest; s.t. represents the conditions that must be satisfied when solving the minimum value; Egz is the energy consumption when the lifting equipment is working; ALL is the number of the idle lifting equipment; Exx is the energy consumption when the lifting equipment is on standby.

[0046] The present invention provides a construction control method for the steel box arch rib of a long-span tied-arch bridge, revealing the influence mechanism of external meteorological factors on the arch rib temperature field during the construction stage, clarifying the real-time change mechanism of the arch rib linear shape of a long-span tied-arch bridge considering the temperature effect, accurately evaluating the influence of temperature on it, and determining the optimal temperature at closure to ensure the safety and durability of the bridge, accurately determining the expected time of closure and the size of the closure joint position, and effectively improving the construction accuracy and efficiency.

[0047] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structure specifically pointed out in the written specification and the drawings.

[0048] The technical solutions of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0049] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0050] Figure 1 is a flowchart of a construction control method for the steel box arch rib of a long-span tied-arch bridge according to an embodiment of the present invention;

[0051] Figure 2 is a construction site diagram of the steel box arch rib of a long-span tied-arch bridge according to an embodiment of the present invention. Detailed Embodiments

[0052] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0053] As Figure 1 - Figure 2 shown, the embodiment of the present invention provides a construction control method for the steel box arch rib of a long-span tied-arch bridge, including steps S1 - S4:

[0054] S1. Establish a three-dimensional model of the steel box arch rib segments of the long-span tied-arch bridge and number the arch rib segments in sequence;

[0055] S2. Continuously monitor the temperature data of the arch rib segments all day long by using mathematical statistics and comparative analysis methods to obtain the monitoring data;

[0056] S3. Based on the monitoring data and the 3D model, adopt the heat exchange theory between the bridge structure and the external environment and the bridge structure thermal analysis theory. Based on the time history analysis method and the radiation model, establish a transient thermal analysis method for the spatial time-varying non-uniform temperature field of the steel box arch rib segment under the combined action of solar radiation - member occlusion - environmental temperature, and analyze the influence laws of natural parameters, steel box arch rib structural attributes, and construction parameters on the spatial time-varying non-uniform temperature field;

[0057] S4. Determine the expected closing time and the position and size of the closing joint according to the influence laws, and adjust the position and size of the closing joint based on the closing joint adjustment device and complete the closing construction operation of the arch rib segment within the expected time.

[0058] The working principle of the above technical solution: By establishing a 3D model of the steel box arch rib of the long-span tied-arch bridge, the structural characteristics of the arch rib can be more intuitively understood. Numbering the arch rib segments helps subsequent data management and analysis.

[0059] Use mathematical statistics and comparative analysis methods to continuously monitor the temperature data of the arch rib segments all day long to obtain the temperature change data of the arch rib at different time periods and under different weather conditions. Through continuous monitoring, the subtle differences in the arch rib temperature with time and environmental conditions can be captured.

[0060] Based on the monitoring data and the 3D model, adopt the heat exchange theory between the bridge structure and the external environment and the bridge structure thermal analysis theory, combined with the time history analysis method and the radiation model, establish a transient thermal analysis method for the spatial time-varying non-uniform temperature field of the steel box arch rib segment under the combined action of solar radiation - member occlusion - environmental temperature. The purpose is to deeply analyze the influence laws of natural parameters (such as solar radiation intensity, environmental temperature, etc.), steel box arch rib structural attributes (such as materials, dimensions, etc.), and construction parameters on the spatial time-varying non-uniform temperature field, and can more accurately predict the temperature distribution and change laws of the arch rib under different conditions.

[0061] Heat exchange theory: Understand the heat exchange mechanism between the bridge structure and the external environment, including solar radiation, air convection, heat conduction, etc. Bridge structure thermal analysis theory: Apply the principles of thermodynamics to analyze the thermal stress, thermal deformation, etc. of the bridge structure under temperature changes. Time history analysis method: Take time as a variable, consider the change of temperature over time, and conduct dynamic thermal analysis on the bridge structure. Radiation model: Establish a radiation model of solar radiation on the bridge structure, considering parameters such as solar angle and radiation intensity. Comprehensively consider the influence of factors such as solar radiation, component occlusion, and ambient temperature on the temperature field of the steel box arch rib segment. Using the time history analysis method and the radiation model, establish a transient thermal analysis method for the spatial-time-varying non-uniform temperature field of the steel box arch rib segment. This method can simulate the change of the temperature field over time and consider the temperature difference at different positions. Study the influence of natural parameters such as solar radiation intensity and ambient temperature on the temperature field. Analyze the influence of structural attributes such as materials, dimensions, and shapes on the temperature field. Explore the influence of construction parameters such as construction sequence, construction method, and closure time on the temperature field. Deeply understand the behavioral characteristics of the steel box arch rib segment in the spatial-time-varying non-uniform temperature field.

[0062] Considering the change trend of the temperature field and its influence on the closure operation, based on the closure joint adjustment device, adjust the position and size of the closure joint to ensure the completion of the closure construction operation of the arch rib segment within the expected time, which is convenient for ensuring the integrity and safety of the arch bridge structure.

[0063] Beneficial effects of the above technical solutions: Reveal the influence mechanism of external meteorological factors on the temperature field of the arch rib during the construction stage, clarify the real-time change mechanism of the arch rib alignment of long-span tied-arch bridges considering temperature effects, accurately evaluate the influence of temperature on it, and determine the optimal temperature at closure to ensure the safety and durability of the bridge. Accurately determine the expected time of closure and the position and size of the closure joint, and effectively improve the construction accuracy and efficiency.

[0064] According to some embodiments of the present invention, the natural parameters include solar radiation, ambient temperature, and wind speed; the structural attributes of the steel box arch rib include the structural dimensions of the steel box arch rib, the construction process, displacement, and deformation.

[0065] Working principle of the above technical solution: The solar radiation intensity is one of the main factors affecting the temperature field of the bridge structure. Both direct and scattered solar radiation can cause the temperature of the bridge surface to rise. In the transient thermal analysis method, it is necessary to establish a solar radiation model, considering the angle of the sun, radiation intensity, and its variation over time, to accurately simulate the impact of solar radiation on the temperature field of the bridge structure. The ambient temperature refers to the air temperature of the environment around the bridge. The change in ambient temperature will affect the heat exchange process of the bridge structure, thereby affecting the temperature field. In the transient thermal analysis method, it is necessary to collect ambient temperature data and input it as a boundary condition into the model to simulate the impact of ambient temperature on the temperature field of the bridge structure. The wind speed will affect the convective heat exchange on the bridge surface, thereby affecting the temperature field. Especially in high-temperature weather, an increase in wind speed can accelerate the heat dissipation on the bridge surface and reduce the temperature. In the transient thermal analysis method, it is necessary to consider the impact of wind speed on the temperature field of the bridge structure and establish a corresponding convective heat exchange model.

[0066] The structural dimensions of the steel box arch rib (such as thickness, width, height, etc.) will affect its heat capacity and heat conduction performance, thereby affecting the temperature field. In the transient thermal analysis method, it is necessary to accurately input the structural dimensions of the steel box arch rib to simulate its impact on the temperature field. Operations such as welding, hoisting, and closure during the construction process will generate heat and affect the temperature field of the bridge structure. In the transient thermal analysis method, it is necessary to consider the heat generation and dissipation during the construction process, as well as the impact of the construction sequence on the temperature field. Temperature changes will cause displacements and deformations of the bridge structure, and these changes will in turn affect the distribution of the temperature field. In the transient thermal analysis method, it is necessary to establish an interaction model between the structural displacement and deformation and the temperature field to simulate this mutual influence.

[0067] Beneficial effects of the above technical solution: By comprehensively considering the above natural parameters and the structural properties of the steel box arch rib, a more accurate temperature field model of the bridge structure is established. This model can be used to predict the temperature distribution and variation law of the bridge structure under different weather and construction conditions, providing a scientific basis for the construction and operation of the bridge. By comparing the temperature field simulation results under different parameters, the impact law of natural parameters and the structural properties of the steel box arch rib on the temperature field can be analyzed in depth.

[0068] According to some embodiments of the present invention, a three-dimensional model of the steel box arch rib segment of a long-span tied-arch bridge is established and the arch rib segments are numbered in sequence, including:

[0069] Determine the attribute information of the steel box arch rib segment of the long-span tied-arch bridge according to the design drawings; the attribute information includes the span, rise, arch axis shape, and cross-sectional dimensions of the arch rib segment;

[0070] Generate an initial model based on the attribute information using modeling software;

[0071] Add detailed features to the initial model to obtain a 3D model; the detailed features include stiffeners, connecting plates, and sling connection points.

[0072] Number each arch rib segment in the 3D model in sequence based on a preset numbering rule.

[0073] The working principle of the above technical solution: Extract the attribute information of the arch rib segments from the design drawings, which includes but is not limited to: Span: The length of the arch rib segment in the horizontal direction. Rise: The height of the arch rib from the arch springing to the crown. Arch axis shape: The shape of the center line of the arch rib, such as a parabola, circular arc, etc. Cross-sectional dimensions: The cross-sectional dimensions of the arch rib, such as width, height, and wall thickness. Select a suitable 3D modeling software according to actual needs to create an initial model: In the modeling software, according to the extracted attribute information, use basic geometric shapes (such as lines, surfaces, etc.) to create the initial 3D model of the arch rib segment. This step is mainly to construct the basic form and dimensions of the arch rib. Add detailed features: Stiffeners: Add stiffeners to the initial model. Stiffeners are internal support structures that enhance the structural stiffness and stability of the arch rib. Connecting plates: Add connecting plates, which are used to connect slings or other structural components between arch rib segments. Sling connection points: Mark the positions of the sling connection points on the arch rib. These points are the key positions where the slings are connected to the arch rib. In the modeling software, formulate a clear numbering rule for the arch rib segments. This rule should be able to uniquely identify each arch rib segment and facilitate subsequent construction and management.

[0074] The beneficial effects of the above technical solution: Establish an accurate and detailed 3D model of the steel box arch rib segments of a long-span tied-arch bridge and number each arch rib segment.

[0075] According to some embodiments of the present invention, the temperature data of the arch rib segments is continuously monitored all-weather using mathematical statistics and comparative analysis methods to obtain monitoring data, including:

[0076] Install temperature sensors and a data acquisition system on the arch rib segments to collect temperature data at set time intervals.

[0077] Process and analyze the temperature data based on mathematical statistics and comparative analysis methods to obtain monitoring data.

[0078] Working principle of the above technical solution: The selection of the temperature sensor should be determined according to the material, size, and expected temperature range of the arch rib segment. Install the temperature sensor at a suitable position on the arch rib segment to ensure that the sensor can fully contact and reflect the actual temperature of the arch rib. The installation position should avoid possible heat sources or cold sources to reduce the interference of external factors on temperature measurement. The data acquisition system should have the functions of real-time acquisition, storage, and transmission of temperature data. The system should be able to automatically collect temperature data at set time intervals (such as every 30 minutes, every hour, etc.) and ensure the integrity and accuracy of the data. The data acquisition system should operate continuously throughout the day and night to ensure that the temperature changes of the arch rib segment at different time periods and under different weather conditions can be captured. Apply mathematical statistics methods to analyze the temperature data, such as calculating statistical quantities such as the average value, standard deviation, and extreme values, to understand the overall distribution and variation law of the temperature data. Time series analysis methods, such as smoothing techniques (such as moving average, exponential smoothing), trend decomposition, etc., can be used to identify the long-term trend, seasonal variation, and periodic variation of the temperature. Compare and analyze the actually monitored temperature data with the expected values or historical data to evaluate the temperature change of the arch rib segment. Tools such as charts and curve graphs can be used to visually display the variation trend and comparison results of the temperature data. Based on the processing and analysis results of mathematical statistics and comparative analysis methods, conclusions about the temperature change of the arch rib segment can be obtained, such as the law of temperature change and influencing factors.

[0079] Beneficial effects of the above technical solution: Continuously monitor the temperature data of the arch rib segment throughout the day and night by using mathematical statistics and comparative analysis methods, and obtain the monitored data and its analysis results.

[0080] According to some embodiments of the present invention, before adjusting the position and size of the closure joint based on the closure joint adjustment device and completing the closure construction operation of the arch rib segment within the expected time, simulate the closure construction operation of the arch rib segment, including:

[0081] Construct the design model of the lower chord rods on both sides of the closure section of the arch rib segment;

[0082] Measure the actual dimensions of the members on both sides of the closure section, update the measurement data to the parameter table of the truss arch segment model, and simulate the chord rods of the closure section of the horizontal box-shaped structure by using the method of clamping and butt-joint connection with internal and external splicing plates; simulate the web members and the inclined members of the upper and lower horizontal bracings of the closure section by using the "X" structure respectively.

[0083] Working principle of the above technical solution: Determine the design parameters of the lower chord rods on both sides of the closure section, including dimensions, shapes, material properties, etc. Use 3D modeling software to establish a 3D model of the lower chord rods according to the design parameters. The model should reflect the structural characteristics and details of the lower chord rods in detail, such as wall thickness, stiffeners, etc. Use measuring tools (such as laser rangefinders, tape measures, etc.) to measure the actual dimensions of the members on both sides of the closure section. The measurement should cover the length, width, height of the members and the dimensions of key connection parts. Update the measured data to the parameter table of the truss arch section model. Ensure that the dimensions in the model are consistent with the actual situation to improve the accuracy of the simulation. According to the construction plan, determine that the chord rods of the closure section adopt the method of butt joint connection clamped by internal and external splicing plates. Simulate the installation and clamping process of the internal and external splicing plates in the 3D model. Ensure that the connection between the splicing plates and the chord rods is tight and meets the design requirements. According to the construction plan, determine that the web members and the diagonal members of the upper and lower horizontal bracings of the closure section adopt an "X" structure. Integrate all components of the closure section into a model for overall simulation analysis. The analysis should cover aspects such as structural strength, stability, and deformation.

[0084] Beneficial effects of the above technical solution: Conduct a detailed simulation analysis of the closure construction operation of the arch rib section, providing strong technical support and guidance for the actual construction. This can not only improve the construction efficiency and quality but also reduce the construction risks and costs.

[0085] According to some embodiments of the present invention, it further includes:

[0086] When performing the closure construction operation of the arch rib section, obtain the morphological data and mechanical data of the long-span tied-arch bridge;

[0087] Construct a BIM model of the long-span tied-arch bridge;

[0088] Input the morphological data and mechanical data into the BIM model to monitor the construction progress and construction quality.

[0089] Working principle of the above technical solution: Use measuring devices (such as total stations, GPS, etc.) to accurately measure each key part of the long-span tied-arch bridge to obtain its morphological data. The morphological data includes, but is not limited to, the span of the bridge, the height and width of the arch rib, and the connection part dimensions of the arch rib segments, etc. Monitor the deformation and stress distribution of the bridge under the stressed state through sensors (such as strain gauges, accelerometers, etc.). The mechanical data includes, but is not limited to, the stress, strain, deflection, vibration frequency, etc. of the bridge. Select a suitable BIM software for modeling according to the engineering requirements and software functions to construct the BIM model of the long-span tied-arch bridge. Utilize the three-dimensional visualization function of the BIM model to monitor the construction progress in real time. By comparing the actual construction progress with the planned progress, discover and correct deviations in a timely manner. Utilize the mechanical information and morphological data in the BIM model to monitor the construction quality. Evaluate the quality of the construction by analyzing the deformation and stress distribution of the model. If construction quality problems are found, take measures for rectification in a timely manner.

[0090] Beneficial effects of the above technical solution: By obtaining the morphological data and mechanical data of the long-span tied-arch bridge, constructing a BIM model, and inputting these data into the model, the construction progress and construction quality can be effectively monitored. This helps to ensure the smooth progress of the project and the safety of the structure.

[0091] According to some embodiments of the present invention, the morphological data includes the shapes and installation positions of the arch seats and arch ribs; the mechanical data includes the force information of the arch ring and supports after the installation of each arch rib segment.

[0092] According to some embodiments of the present invention, the morphological data is obtained through lidar and scanning devices; the mechanical data is obtained through stress-strain sensors.

[0093] Beneficial effects of the above technical solution: Obtaining morphological data through lidar and scanning devices, and obtaining mechanical data through stress-strain sensors are important steps in the closure construction operation of arch rib segments. The acquisition and application of these data are of great significance for ensuring the quality and safety of bridge engineering.

[0094] According to some embodiments of the present invention, before establishing a transient thermal analysis method for the spatial time-varying non-uniform temperature field of the steel box arch rib segment under the combined action of solar radiation - component occlusion - environmental temperature based on the time history analysis method and the radiation model by using the heat exchange theory between the bridge structure and the external environment and the bridge structure thermal analysis theory according to the monitoring data and the three-dimensional model, it further includes: classifying the monitoring data;

[0095] Classifying the monitoring data includes:

[0096] Segmenting the monitoring data to obtain several pieces of data, and determining the weight coefficients corresponding to each category for each piece of data;

[0097]

[0098] wherein, is to construct the objective function for the minimum value; s.t. is the constraint condition; w i,j is the probability that the i-th data corresponds to the j-th category; d i,j is the central distance between the i-th data and the j-th category; p is the number of data obtained by splitting the monitoring data; K is the number of preset monitoring data divided into K categories, N * is the set of positive integers;

[0099] Based on the weight coefficients of each data corresponding to each category, data classification is performed to obtain the data classification result.

[0100] The working principle of the above technical solution: The original monitoring data is segmented to obtain several independent data records. These data records may include monitoring data such as temperature, stress, and strain of different parts of the bridge, as well as information such as timestamps and environmental parameters. In order to classify the data into different categories, it is necessary to determine the weight coefficients of each data corresponding to each category. This is achieved by calculating the distance between the data points and the category centers. The weight coefficients reflect the degree of association between the data points and a certain category. An objective function is constructed, which aims to minimize the sum of the weighted distances from all data points to the centers of their respective categories. Solving this optimization problem can obtain the optimal weight coefficients of each data corresponding to each category. Based on the weight coefficients of each data corresponding to each category, the data can be classified into the category with the largest weight. In this way, the data classification result can be obtained.

[0101] The beneficial effects of the above technical solution: Data classification of the monitoring data is an important step before establishing a transient thermal analysis method for the spatial-time varying non-uniform temperature field of steel box arch rib segments under the combined action of solar radiation - component occlusion - environmental temperature. Through effective data classification, accurate and reliable data support can be provided for subsequent analysis and modeling, improving the accuracy of data classification.

[0102] According to some embodiments of the present invention, before the closure construction operation of the arch rib segment, determine the number of required lifting equipment;

[0103] Determine the number of idle lifting equipment and the closure construction workload;

[0104] Calculate the utilization rate of the lifting equipment;

[0105]

[0106] Among them, η is the utilization rate of the lifting equipment; TP is the lifting capacity of the lifting equipment; N is the number of lifting equipment used for this experiment; ZS is the amount of work for lifting in this experiment; f is the working frequency of the lifting equipment; b is the amount of closure construction work that can be completed per unit time; t is the working time of each lifting equipment;

[0107] Calculate the delay of each used lifting equipment;

[0108]

[0109] Among them, T is the maximum working frequency of the lifting equipment; AC is the input clock of the lifting equipment; FW floor(t) is the value of the floor(t)th term of the Fibonacci sequence; floor( ) is to round the value in the parentheses, and the value range is from 0 to 1; Me is the delay of each used lifting equipment obtained by calculation; λ is an adjustment coefficient, and the value range is (0, 1);

[0110] According to the utilization rate of the lifting equipment and the delay of the lifting equipment, use Lagrange to perform equilibrium solution to determine the required number of lifting equipment;

[0111] min(N*Egz+(ALL-N)*Exx)

[0112]

[0113] Among them, min(N*Egz+(ALL-N)*Exx) is to solve for a value N to minimize the value in the parentheses of min(); s.t. represents the conditions that must be satisfied when solving the minimum value; Egz is the energy consumption when the lifting equipment is working; ALL is the number of the idle lifting equipment; Exx is the energy consumption when the lifting equipment is on standby.

[0114] The working principle and beneficial effects of the above technical solution: Determine the number of idle lifting equipment and the amount of closure construction work, calculate the utilization rate of the lifting equipment and the delay of each used lifting equipment. Among them, AC is the input clock of the lifting equipment, representing the preparation time from when the equipment starts to when it starts working. FW_floor(t) is used to consider the increasing work complexity or efficiency change over time. λ is an adjustment coefficient used to consider the efficiency loss in actual work. Construct the Lagrangian function:

[0115] L(N,λ1,λ2,λ3)

[0116] =N·Egz+(ALL-N)·Exx+λ1(η - 0.5)+λ2(200 - Me)+λ3(ALL-N)

[0117] Take the partial derivatives of L with respect to N, λ1, λ2, and λ3, and set them equal to 0; solve this system of equations to obtain the optimal value of N and the corresponding Lagrange multipliers. Determine a reasonable number N of lifting devices to maximize the resource utilization efficiency and reduce costs while meeting the construction requirements. This number is obtained based on a comprehensive consideration of multiple factors such as the utilization rate, delay, and energy consumption of the lifting devices.

[0118] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A construction control method for the steel box arch rib of a long-span tied-arch bridge, characterized in that, Including: Establish a 3D model of the steel box arch rib segments of a long-span tied-arch bridge and number the arch rib segments sequentially; Use mathematical statistics and comparative analysis methods to continuously monitor the temperature data of the arch rib segments all-weather in a temperature data room to obtain monitoring data; Based on the monitoring data and the 3D model, adopt the heat exchange theory between the bridge structure and the external environment and the bridge structure thermal analysis theory, and establish a transient thermal analysis method for the spatial time-varying non-uniform temperature field of the steel box arch rib segments under the combined action of solar radiation - member occlusion - environmental temperature, based on the time history analysis method and the radiation model, and analyze the influence laws of natural parameters, the structural properties of the steel box arch rib, and construction parameters on the spatial time-varying non-uniform temperature field; Determine the expected time for closure and the position and size of the closure joint according to the influence laws, and adjust the position and size of the closure joint based on the closure joint adjustment device and complete the closure construction operation of the arch rib segments within the expected time.

2. The construction control method of the steel box arch rib of the long-span tied arch bridge according to claim 1, wherein, The natural parameters include solar radiation, environmental temperature, and wind speed; the structural properties of the steel box arch rib include the structural dimensions of the steel box arch rib, the construction process, displacement, and deformation.

3. The construction control method of the steel box arch rib of the long-span tied arch bridge according to claim 1, characterized in that, Establish a 3D model of the steel box arch rib segments of a long-span tied-arch bridge and number the arch rib segments sequentially, including: Determine the attribute information of the steel box arch rib segments of the long-span tied-arch bridge according to the design drawings; the attribute information includes the span, rise, arch axis shape, and cross-sectional dimensions of the arch rib segments; Generate an initial model based on the attribute information using modeling software; Add detailed features to the initial model to obtain a 3D model; the detailed features include stiffeners, connecting plates, and sling connection points; Number each arch rib segment in the 3D model sequentially based on a preset numbering rule.

4. The construction control method for the steel box arch rib of a long-span tied-arch bridge as described in claim 1, characterized in that, Use mathematical statistics and comparative analysis methods to continuously monitor the temperature data of the arch rib segments all-weather in a temperature data room to obtain monitoring data, including: Install temperature sensors and a data acquisition system on the arch rib segments to collect temperature data at a set time interval; Process and analyze the temperature data based on mathematical statistics and comparative analysis methods to obtain monitoring data.

5. The construction control method for the steel box arch rib of a long-span tied-arch bridge according to claim 1, characterized in that, Before adjusting the position and size of the closure joint based on the closure joint adjustment device and completing the closure construction operation of the arch rib segments within the expected time, simulate the closure construction operation of the arch rib segments, including: Construct a design model of the lower chord bars on both sides of the closure section of the arch rib segments; Measure the actual dimensions of the members on both sides of the closure section and update the measurement data to the parameter table of the truss arch segment model, and simulate the chord bars of the closure section of the horizontal box structure using the method of clamping and butt-joint connection with internal and external splicing plates; simulate the web members and the inclined bars of the upper and lower horizontal bracings of the closure section using an "X" structure respectively.

6. The construction control method of the steel box arch rib of the long-span tied-arch bridge according to claim 1, characterized in that It also includes: When performing the closure construction operation of the arch rib segments, obtain the morphological data and mechanical data of the long-span tied-arch bridge; Construct a BIM model of the long-span tied-arch bridge; Input the morphological data and mechanical data into the BIM model to monitor the construction progress and construction quality.

7. The construction control method for the steel box arch rib of a long-span tied-arch bridge according to claim 6, characterized in that, The morphological data includes the shapes and installation positions of the arch seats and arch ribs; the mechanical data includes the force information of the arch ring and supports after the installation of each arch rib segment.

8. The construction control method of the steel box arch rib of the long-span tied-arch bridge according to claim 7, characterized in that The morphological data is obtained through a lidar and a scanning device; the mechanical data is obtained through stress-strain sensors.

9. The construction control method for the steel box arch rib of a long-span tied-arch bridge as described in claim 1, characterized in that, Before establishing a transient thermal analysis method for the spatial time-varying non-uniform temperature field of a steel box arch rib segment under the combined action of solar radiation-component occlusion-environmental temperature based on the heat exchange theory between the bridge structure and the external environment and the bridge structure thermal analysis theory according to the monitoring data and the three-dimensional model, and based on the time history analysis method and the radiation model, it also includes: classifying the monitoring data; Classifying the monitoring data includes: Segmenting the monitoring data to obtain several pieces of data, and determining the weight coefficient of each piece of data corresponding to each category; Among them, to construct the minimum value of the objective function ; s.t. is the constraint condition; w i,j is the probability that the i-th data corresponds to the j-th category; d i,j is the central distance between the i-th data and the j-th category; p is the number of data obtained by splitting the monitoring data; K is the number of categories into which the preset monitoring data is divided into K categories, N * is the set of positive integers; Based on the weight coefficient of each piece of data corresponding to each category, conducting data classification to obtain the data classification result.

10. The construction control method for the steel box arch rib of a long-span tied-arch bridge according to claim 1, characterized in that, Before carrying out the closure construction operation of the arch rib segment, determining the number of required lifting equipment; Determining the number of idle lifting equipment and the closure construction workload; Calculating the utilization rate of the lifting equipment; Where, η is the utilization rate of the lifting equipment; TP is the lifting capacity of the lifting equipment; N is the number of lifting equipment used for this experiment for lifting; ZS is the workload of lifting used for this experiment; f is the working frequency of the lifting equipment; b is the closure construction workload that can be completed per unit time; t is the working time of each lifting equipment; Calculating the delay of each used lifting equipment; Wherein, T is the maximum working frequency of the lifting device; AC is the input clock of the lifting device; FW floor(t) is the floor(t)-th value of the Fibonacci sequence; floor() is to round the value in the parentheses, and the value range is 0 to 1; Me is the delay of each used lifting device obtained by calculation; λ is an adjustment coefficient, and the value range is (0, 1); According to the utilization rate of the lifting equipment and the delay of the lifting equipment, using Lagrange to perform equilibrium solution to determine the number of required lifting equipment; min(N*Egz+(ALL-N)*Exx) Where, min(N*Egz+(ALL-N)*Exx) is to solve for a value N to minimize the value within the parentheses of min(); s.t. represents the conditions that must be satisfied when solving for the minimum value; Egz is the energy consumption when the lifting equipment is working; ALL is the number of the idle lifting equipment; Exx is the energy consumption when the lifting equipment is on standby.

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