A 3D Automatic Design System and Method for Steel Box Girder Bridges Based on Inventor

Abstract

The present invention discloses a three-dimensional automatic design system and method for a steel box girder bridge based on Inventor, belonging to the technical field of three-dimensional modeling numerical control programs, including: a data input and control module for receiving and storing bridge width, bridge span layout, radius of curvature, three-dimensional route data, and design camber data; a parametric component library module with a built-in standard section library and a diaphragm unit library; a modeling rule control module with a preset rule engine embedded; an automatic modeling and assembly module for lofting sections along the three-dimensional route according to a preset accuracy and lofting interval; and an output module for outputting a three-dimensional BIM model of the steel box girder, construction drawings, and engineering quantity budget results. The automatic modeling and assembly of the present invention enable the system to automatically loft sections along the three-dimensional route according to a preset accuracy, dynamically generate diaphragm spacings based on steel bridge data, and complete model assembly in combination with spatial constraint logic, greatly reducing the time for manual adjustment and modeling.

Description

Technical Field

[0001] The present invention relates to the technical field of three-dimensional modeling numerical control programs, and particularly relates to a three-dimensional automatic design system and method for steel box girder bridges based on Inventor. Background Art

[0002] With the continuous development of modern bridge engineering, steel box girder bridges have become the preferred structural form for the construction of large-scale infrastructure such as cross-sea bridges and urban viaducts due to their high strength, high construction efficiency, and strong adaptability to complex terrains. However, in the design stage of steel box girder bridges, traditional methods overly rely on manual experience, resulting in a series of problems that urgently need to be solved, seriously restricting the transformation and upgrading of the industry towards intelligence and standardization.

[0003] In the traditional design process of steel box girder bridges, manual experience dominates, bringing core problems such as low efficiency, insufficient accuracy, and poor collaboration. Engineers need to manually adjust key parameters such as bridge width and span, and modify geometric elements one by one during the design process. The modeling process is time-consuming and laborious, often taking dozens of hours to complete. For example, when making key decisions such as cross-section type selection and chamber quantity matching, due to the lack of assistance from a standardized rule engine and complete reliance on the personal experience of designers, not only does the design cycle extend, but design errors are also likely to occur due to human negligence. In addition, during the diaphragm assembly process, it is necessary to repeatedly position static components in the model library. Especially when dealing with complex curvature sections and calculating cross slopes, it takes even longer, greatly affecting the design efficiency.

[0004] In addition, the deficiencies in parametric and dynamic assembly capabilities further limit the design efficiency and quality of steel box girder bridges. Existing parametric tools, such as the basic functions of Inventor, lack built-in design rules and cannot automatically match cross-section types according to bridge width or dynamically calculate plate thickness. The parametric association between the standard cross-section library and the diaphragm unit library is weak, resulting in poor model reusability. Taking diaphragm assembly as an example, traditional methods rely on static model libraries and manual modeling and positioning work, and cannot automatically calculate the spacing and implement dynamic assembly according to the bridge parameters designed. As a result, designers need to complete complicated model positioning or alignment work, which also has a certain impact on the modeling accuracy.

[0005] The fragmentation of result output and poor collaboration are also major pain points in the traditional design of steel box girder bridges. BIM models, construction drawings, and bill of quantities usually need to be generated by switching between multiple software, resulting in a broken data link. For example, when conducting quantity statistics, it is necessary to manually match components with the unit price list, which makes the budget error rate exceed 2%; when annotating drawings, it is also necessary to double-check model parameters, and the error rate reaches 1.5%, making it difficult to meet the strict requirements of integrated delivery in EPC projects.

[0006] In the prior art, although basic parametric modeling has been achieved, there are still significant defects. It lacks a rule engine for automatically determining the number of chambers, still relying on manual input; it does not integrate finite element analysis and elevation correction logic, resulting in improper handling of cambers; the position of diaphragms depends on fixed templates, making it difficult to adapt to changes in curvature and cross slope; there is no dynamic association between engineering quantity data and the model, forming data islands. These problems prevent the existing patented technologies from meeting the intelligent and standardized requirements of modern steel box girder bridge design.

[0007] Based on this, the present invention designs a three-dimensional automated design system and method for steel box girder bridges based on Inventor to solve the above problems. Summary of the Invention

[0008] In view of the above-mentioned shortcomings of the prior art, the present invention provides a three-dimensional automated design system and method for steel box girder bridges based on Inventor.

[0009] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0010] A three-dimensional automated design system for steel box girder bridges based on Inventor includes the following modules:

[0011] A data input and control module for receiving and storing bridge width, bridge span arrangement, radius of curvature, three-dimensional route data, and design camber data; the three-dimensional route modeling module generates a three-dimensional curve through spatial coordinates and corrects it into a designed line with camber through a camber superposition engine;

[0012] A parametric component library module with a built-in standard section library and a diaphragm unit library; the standard section library contains multi-chamber parametric templates that dynamically match the number of chambers and various section parameters with the bridge width through a unique identifier; the diaphragm unit library generates derivative models of cross beams and transverse ribs based on station numbers;

[0013] A modeling rule control module with a preset rule engine embedded, used to automatically select the section type according to the bridge width, calculate the plate thickness and stiffener parameters, and achieve section self-adaptation by dynamically adjusting the primitive dimensions;

[0014] An automatic modeling and assembly module that lays out sections along the three-dimensional route with a preset accuracy, automatically generates the diaphragm spacing according to data such as span segment, clear span, radius of curvature, and stiffener type, and completes model assembly in combination with spatial constraint logic;

[0015] An output module that outputs a three-dimensional BIM model and an engineering quantity budget, and the engineering quantity budget is generated through dynamic association of component codes and model parameters.

[0016] A three-dimensional automated design method for a steel box girder bridge based on the Inventor, comprising the following steps:

[0017] S1: Input the bridge width, bridge span layout and three-dimensional route data to generate a design line with camber;

[0018] S2: Call the standard section template according to the bridge width range and the radius of curvature in the horizontal curve parameters, and dynamically adjust the section parameters through a rule engine;

[0019] S3: Dynamically adjust the lofting interval along the three-dimensional route according to the modeling accuracy requirements, and realize model lofting based on cross-section profile recognition;

[0020] S4: Calculate the diaphragm position and quantity according to the span section, the clear span of this span, the longitudinal rib type and the clear span, generate a derivative model with the station number as the key, and complete the spatial constraint assembly;

[0021] S5: Output a three-dimensional BIM model, construction drawings and associated bill of quantities.

[0022] Furthermore, the camber superposition engine generates a camber curve through finite element analysis and corrects it point by point with the original route data to ensure that the elevation error is less than the error threshold generated by finite element analysis.

[0023] Furthermore, the diaphragm unit library realizes dynamic derivation of the model through iPartFactory, and the derivation logic automatically calculates the diaphragm spacing and positioning parameters based on the span section, clear span, radius of curvature and stiffener type.

[0024] Furthermore, the engineering quantity budget realizes dynamic association with the BIM model in XML format, and attaches a unit conversion coefficient to compress the statistical error within a preset range.

[0025] Furthermore, the modeling rule control module dynamically adjusts the flange width, top and bottom plate dimensions, number of stiffeners, and cross-section slope through iLogic pseudo-code rules, and the rules automatically select a preset width value based on the type of longitudinal rib on the top plate.

[0026] Furthermore, the lofting interval of the automatic modeling and assembly module is dynamically adjusted according to the modeling accuracy requirements. The interval at the bend is less than that of the straight section, and the lofting accuracy is controlled by the feedback of the cross-section positioning error at the key station number. The accuracy requirement means that the user needs to adjust the modeling accuracy by customizing the interval distance. Generally, it is recommended to have an interval of 3m in the straight section, and less than 1m at the bend and key station number; during the assembly process, the diaphragm positioning calculation system has the function of automatically calculating the positioning information, and the general deviation is <5mm.

[0027] Furthermore, the cross-section templates in the standard cross-section library are designed to calculate design parameters through modular design and automatically match cross-section templates based on the bridge width range.

[0028] Furthermore, the spatial constraint assembly includes checking the positioning errors between the derived model and the lofting model through coplanarity, distance, and point constraint logics, and triggering parameter correction when the tolerance is exceeded.

[0029] Furthermore, the three-dimensional route modeling module fits the corrected design line by the least squares method, eliminates elevation errors, and triggers recalculation when the error exceeds the limit.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. The present invention realizes automated modeling and assembly. The system can automatically loft cross-sections along a three-dimensional route with a preset accuracy, automatically generate diaphragm spacings according to data such as span section, clear span, radius of curvature, and stiffener type, and complete model assembly in combination with spatial constraint logics, greatly reducing the time for manual adjustment and modeling. The modeling process is shortened from dozens of hours in the traditional method to several hours or even shorter, significantly improving the design efficiency. Through the parametric component library module and the modeling rule control module, the system can automatically match cross-section types, calculate plate thicknesses and stiffener parameters according to input parameters such as bridge width and span, and dynamically adjust the primitive sizes to achieve cross-section self-adaptation, avoiding the cumbersome process of modifying geometric primitives one by one in the traditional method and accelerating the design progress.

[0032] 2. The system of the present invention is built-in with a standardized rule engine, which can automatically select cross-section types, calculate plate thicknesses and stiffener parameters according to bridge parameters such as bridge width, without relying entirely on the personal experience of designers, reducing design errors caused by human negligence, improving the standardization degree and quality of design. The diaphragm unit library generates derivative models of crossbeams and transverse ribs based on stationing drive, and automatically calculates diaphragm spacings and positioning parameters according to span length, radius of curvature, and stiffener type, realizing the dynamic assembly of diaphragms and adapting to the design requirements of bridges with different spans and curvatures, solving the problem that diaphragm assembly in the traditional method depends on a static model library and is difficult to adapt to complex structures.

[0033] 3. The system of the present invention can output 3D BIM models, construction drawings, and associated BOQs, and the BOQ budget is dynamically associated with model parameters through component coding, avoiding the problem of data link breakage caused by switching between multiple software to generate different results in the traditional method, achieving integrated output of design results, improving collaborative efficiency, meeting the strict requirements of integrated delivery of EPC projects. The dynamic data association among BIM models, construction drawings, and BOQs facilitates information sharing and collaborative work among various participants such as design, construction, and management, reduces communication costs and errors caused by information asymmetry, and improves the overall management efficiency and quality of the project.

[0034] 4. The system of the present invention can handle the design of steel box girder bridges with different parameters such as bridge width, span, and radius of curvature. Whether it is a conventional straight-section bridge or a curved bridge with complex curvature, accurate model generation and assembly can be achieved by dynamically adjusting parameters such as lofting interval and diaphragm spacing, providing reliable technical support for the construction of bridges with complex terrains and special structures. Based on the preset rules and parameters of the system, users can modify some parameters according to actual needs, such as the web thickness, etc., reflecting the flexibility of the system and meeting the specific requirements of different projects. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0036] A three-dimensional automated design system for steel box girder bridges based on Inventor includes the following modules:

[0037] A data input and control module for receiving and storing bridge width, bridge span layout, radius of curvature, three-dimensional route data, and design camber data; the three-dimensional route modeling module generates a three-dimensional curve through spatial coordinates and corrects it to a designed line with camber through a camber superposition engine;

[0038] The camber superposition engine generates a camber curve through finite element analysis and corrects it point by point with the original route data to ensure that the elevation error is less than the error threshold generated by finite element analysis;

[0039] In terms of input parameters, the range of the bridge width (QW) is between 200 cm and 1656 cm, and the data type is positive, which directly determines the number of chambers (XLN) and the width of a single box (XLW);

[0040] The bridge span layout defines the span distribution and beam segment division in the format of 30m + 50m + 30m, and the radius of curvature (R) is not less than 300m;

[0041] The distance from the center of the main beam to the design line (Z - S) is within the range of 1 - 10m, which is used to determine the offset between the main beam and the design line. The three - dimensional route data is a set of X / Y / Z coordinate points stored in CSV format and is used to generate a three - dimensional route model. The design camber (ΔZ camber) is the camber data extracted from the MIDAS calculation model;

[0042] In terms of data storage, a MySQL database is adopted, and the fields are stored in JSON format, covering but not limited to bridge_width (bridge width), span_arrangement (bridge span layout), curvature_radius (radius of curvature), etc.;

[0043] In actual operation, through the formula Z new = Z 原始 + ΔZ 预拱 , the elevation of the route is corrected point by point using the ΔZ curve generated by finite element analysis;

[0044] To ensure accuracy, the elevation error at key pile numbers (such as bridge piers, mid - spans) is strictly controlled within ±2mm, and the least - squares method is used to fit and correct the route.

[0045] The parametric component library module has a built - in standard section library and a diaphragm unit library; the standard section library contains multi - chamber parametric templates, and the parametric sections are automatically matched with the bridge width through a unique identifier; the diaphragm unit library generates derivative models of cross - beams and cross - ribs based on the pile number drive;

[0046] The diaphragm unit library realizes dynamic model derivation through iPartFactory, and the derivation logic automatically calculates the diaphragm spacing and positioning parameters based on the span segment, the clear span of this span, the radius of curvature, and the type of stiffener;

[0047] The section templates of the standard section library generate a single - box width through modular design and automatically match multi - chamber combinations based on the bridge width range;

[0048] In terms of the dynamic matching of the standard section library, the logic of the number of chambers (XLN) is as follows:

[0049] When the single - box width (XLW) = 200cm, if the bridge width (QW) ≤ 1256cm, it is a double - box double - chamber (XLN = 2), and if 1256cm < QW ≤ 1656cm, it is a triple - box triple - chamber (XLN = 3);

[0050] For the modular design of XLW, the available options are 200 cm, 260 cm, 320 cm, and 380 cm. In terms of the flange width (YYW), when the longitudinal rib of the top plate is a U-rib, YYW = 185.5 cm; when it is a plate rib, YYW = 178 cm.

[0051] For the dynamic generation of the diaphragm unit library, the iPartFactory derivation logic uses the station number as the primary key. The main parameters for calculating the station number include the span section where it is located, the clear span of this span, the radius of curvature, and the type of stiffener; the iPartFactory dataset parameters include the bridge width, the thickness of the top plate, the center distance of the main beam structure, the slope, the flange width, the thickness of the web, the width of a single box, the beam height, the thickness of the bottom plate, and the size of the longitudinal rib.

[0052] The conventional spacing of the side-span diaphragms is 500 cm (U-rib) or 300 cm (plate rib); if the clear span minus the number of large crossbeams multiplied by the conventional spacing is less than 130 cm, the special spacing is 400 cm (U-rib) or 200 cm (plate rib).

[0053] In the calculation of the mid-span diaphragm spacing, the special spacing for odd-numbered spans is equal to the span divided by 2 minus the number of single-sided large crossbeams multiplied by the conventional spacing; the special spacing for even-numbered spans is equal to the span divided by 2 minus the number of single-sided large crossbeams multiplied by the conventional spacing, plus 250 cm (U-rib) or 150 cm (plate rib).

[0054] The modeling rule control module, which embeds a preset rule engine, is used to automatically select the section type according to the bridge width, calculate the plate thickness and stiffener parameters, and achieve section self-adaptation by dynamically adjusting the primitive dimensions.

[0055] The modeling rule control module dynamically adjusts the flange width through pseudo-code rules, and the rules automatically select preset width values based on the type of longitudinal rib of the top plate.

[0056] In terms of the parameter mapping logic, the calculation formula for the box spacing (XJJ) is XJJ = (QW - YYW - XLW × XLN) / (XLN - 1), and the beam height (ZL-H) takes 1 / 25 of the largest element in the bridge length parameter array.

[0057] For example, for a 50 m span, the corresponding ZL-H is 2 m), and the web thickness (FB-T) is defaulted to 1.6 cm (when the span is less than 7000 cm), and at the same time, it also supports users to modify according to actual needs.

[0058] In terms of the pseudo-code rules, the flange width is dynamically adjusted through Inventor iLogic: when the longitudinal rib of the top plate is a U-rib, the flange width (YYW) is 185.5 cm; when the longitudinal rib of the top plate is a plate rib, the flange width (YYW) is 178 cm.

[0059] The automatic modeling and assembly module loft the cross-section along the 3D route according to the preset accuracy, dynamically generate the diaphragm spacing based on the bridge parameters, and complete the model assembly in combination with the spatial constraint logic;

[0060] The lofting interval of the automatic modeling and assembly module is dynamically adjusted according to the modeling accuracy requirements. The interval at the bending part is smaller than that of the straight section, and the lofting accuracy is controlled by the feedback of the cross-section positioning error at the key pile numbers;

[0061] Generally, the accuracy requirement is that the interval is at least 3m at the straight part, and at least less than 1m at the bending part and key pile numbers; during the assembly process, the diaphragm positioning calculation system has the function of automatically calculating the positioning information, and the general deviation is <5mm.

[0062] The 3D route is the designed line corrected by the 3D route modeling module through the least squares method, eliminating the elevation error and triggering recalculation when the error exceeds the limit;

[0063] Specifically, at the key pile numbers, the lofting interval does not exceed 0.5m, and the positioning deviation is monitored in real time. Once the deviation reaches or exceeds 5mm, the system will automatically reduce the interval to 50% of the original;

[0064] In addition, the 3D route modeling module uses the X / Y / Z coordinate point set stored in CSV format provided by the data input and control module and uses the B-spline curve algorithm to generate the 3D route model based on the corrected coordinate points. In terms of accuracy control, the accuracy of the B-spline line is improved by increasing the fitting point density. For the bending part (curvature radius R < 500m), the interval density can be encrypted to 1m, and for the straight section, the interval can be 3m.

[0065] The spatial constraint assembly includes checking the positioning error between the derived model and the lofting model through the coplanarity, distance and point constraint logics, and triggering parameter correction when the tolerance is exceeded;

[0066] According to the above-known diaphragm units, first, a parametric model is generated through the iPartFactory with the pile number as the primary key;

[0067] Then, assembly verification is carried out, including coplanarity constraint (tolerance ±1mm) and distance constraint (tolerance ±2mm);

[0068] If there is an out-of-tolerance situation during the assembly process, the system will trigger parameter correction to ensure that the diaphragm unit can be accurately assembled to the specified position. The whole process has a high degree of automation and can effectively ensure the accuracy and efficiency of the assembly.

[0069] The output module outputs the 3D BIM model and the engineering quantity budget, and the engineering quantity budget is generated by dynamically associating the component codes with the model parameters;

[0070] The engineering quantity budget is dynamically associated with the BIM model in XML format, and a unit conversion factor is attached to compress the statistical error within a preset range;

[0071] The generated BIM model adopts the.iam (assembly file) and.ipt (part file) formats of Inventor, and these files contain Attribute marker parameters for quick query and modification during subsequent project management and construction processes;

[0072] For the engineering quantity budget part, the system dynamically associates model parameters in XML format to ensure that the error rate is controlled within 2%, thereby providing accurate material and cost estimates and providing a reliable basis for project budget preparation and cost control.

[0073] The construction drawings are generated into dwg files by automatically extracting the geometric attributes of the model, and their annotation error rate is less than 1%, ensuring the accuracy and professionalism of the construction drawings and meeting the strict requirements of the construction site.

[0074] A three-dimensional automated design method for a steel box girder bridge based on Inventor includes the following steps:

[0075] S1: Input the bridge width, bridge span layout, and three-dimensional route data to generate a design line with a camber;

[0076] S2: Call the standard section template according to the bridge width range and the radius of curvature in the horizontal curve parameters, and dynamically adjust the section parameters through a rule engine;

[0077] S3: Dynamically adjust the lofting interval according to the three-dimensional route according to the modeling accuracy requirements, and realize model lofting based on section profile recognition;

[0078] S4: Calculate the diaphragm position and quantity according to the span length, longitudinal rib type, and clear span, generate a derivative model with the station number as the key, and complete the spatial constraint assembly;

[0079] S5: Output the three-dimensional BIM model, construction drawings, and associated bill of quantities. Embodiment

[0080] According to the above Embodiment 1, when the bridge width QW = 1280 cm, the single-box width XLW = 200 cm, the span is 50 m, and the radius of curvature is 400 m, input the bridge width, bridge span layout, radius of curvature, three-dimensional route data, and design camber data into the system;

[0081] Among them, the bridge width QW = 1280 cm, the bridge span layout is a single 50 - m span, and the radius of curvature R = 400 m. The system conducts finite - element analysis through the pre - camber superposition engine, generates the pre - camber curve, and corrects it point - by - point with the original route data to ensure that the elevation error is less than the error threshold generated by the finite - element analysis. In this embodiment, the maximum elevation error after pre - camber correction is 1.8 mm, meeting the accuracy requirements.

[0082] According to the bridge width QW = 1280 cm and the single - box width XLW = 200 cm, the system matches a double - box double - cell (XLN = 2) cross - section template from the standard cross - section library;

[0083] Meanwhile, according to the span and the radius of curvature, the system generates derivative models of cross - beams and cross - ribs from the diaphragm element library based on the station number drive;

[0084] In this embodiment, the number of side - span large cross - beams is 2, and the special spacing is 400 cm (U - rib); the number of mid - span large cross - beams is 3, and the special spacing is 10 m;

[0085] For the modeling rule control and automatic modeling assembly, the system automatically selects the cross - section type according to the bridge width, calculates the plate thickness and stiffener parameters, and realizes the cross - section self - adaptation by dynamically adjusting the primitive dimensions. In this embodiment, the box spacing XJJ = 694.5 cm, and the web thickness FB - T is defaulted to 1.6 cm;

[0086] The system lofts the cross - section along the three - dimensional route with a preset accuracy, dynamically generates the diaphragm spacing according to the span length, combines the spatial constraint logic to complete the model assembly, and finally generates a BIM model with 2 box - chambers and 45 diaphragms.

[0087] Output and verification: The system outputs the three - dimensional BIM model and the engineering quantity budget. In this embodiment, the error rate of the engineering quantity budget is 1.5%, meeting the accuracy requirements. The generated BIM model uses the.iam and.ipt formats of Inventor, contains Attribute marked parameters, which is convenient for subsequent project management and quick query and modification during the construction process. Embodiment

[0088] According to the above - mentioned Embodiment 1, when the bridge width QW = 1500 cm, the single - box width XLW = 260 cm, the span is 60 m, and the radius of curvature is 600 m, input the bridge width, bridge - span layout, radius of curvature, three - dimensional route data, and design pre - camber data into the system;

[0089] Among them, the bridge width QW = 1500 cm, the bridge - span layout is a single 60 - m span, and the radius of curvature R = 600 m. The system conducts finite - element analysis through the pre - camber superposition engine, generates the pre - camber curve, and corrects it point - by - point with the original route data to ensure that the elevation error is less than the error threshold generated by the finite - element analysis;

[0090] In this embodiment, the maximum elevation error after pre-camber correction is 1.2 mm, meeting the accuracy requirements;

[0091] According to the bridge width QW = 1500 cm and the single-box width XLW = 260 cm, the system matches a three-box and three-room (XLN = 3) section template from the standard section library;

[0092] Meanwhile, according to the span and radius of curvature, the system generates derivative models of cross beams and cross ribs driven by the station number from the diaphragm unit library. In this embodiment, the number of side-span large cross beams is 3, and the special spacing is 350 cm; the number of mid-span large cross beams is 4, and the special spacing is 12 m;

[0093] For modeling rule control and automatic modeling assembly, the system automatically selects the section type according to the bridge width, calculates the plate thickness and stiffener parameters, and realizes section self-adaptation by dynamically adjusting the primitive dimensions. In this embodiment, the box spacing XJJ = 187.25 cm, and the web thickness FB-T is defaulted to 1.6 cm;

[0094] The system loft the section along the 3D route according to the preset accuracy, dynamically generates the diaphragm spacing according to the span length, and completes the model assembly in combination with the spatial constraint logic. The finally generated BIM model contains 3 box rooms and 52 diaphragms;

[0095] The system outputs the 3D BIM model and the engineering quantity budget. In this embodiment, the error rate of the engineering quantity budget is 1.6%, meeting the accuracy requirements. The generated BIM model adopts the.iam and.ipt formats of Inventor and contains Attribute marked parameters, which is convenient for subsequent project management and quick query and modification during the construction process.

[0096] Through the application of this embodiment, the efficient and accurate design of the steel box girder bridge is realized, providing reliable technical support for the construction of large-scale cross-sea bridge projects. Embodiment

[0097] According to the above-mentioned Embodiment 1, when the bridge width QW = 1656 cm, the single-box width XLW = 380 cm, the span is 70 m, and the radius of curvature is 300 m, input the bridge width, bridge span layout, radius of curvature, 3D route data, and design pre-camber data into the system;

[0098] Among them, the bridge width QW = 1656 cm, the bridge span layout is a 70 m single span, and the radius of curvature R = 300 m. The system conducts finite element analysis through the pre-camber superposition engine, generates the pre-camber curve and corrects it point by point with the original route data to ensure that the elevation error is less than the error threshold generated by the finite element analysis;

[0099] In this embodiment, the maximum elevation error after pre-camber correction is 2.0 mm, and it is corrected to ±1.5 mm by the least squares method fitting, meeting the accuracy requirements;

[0100] According to the bridge width QW = 1656 cm and the single box width XLW = 380 cm, the system matches a three-box and three-room (XLN = 3) cross-section template from the standard cross-section library.

[0101] Meanwhile, according to the span and radius of curvature, the system generates derivative models of cross beams and cross ribs from the diaphragm unit library based on the station number. In this embodiment, the number of large cross beams in the side span is 4, and the special spacing is 300 cm; the number of large cross beams in the middle span is 5, and the special spacing is 15 m.

[0102] For modeling rule control and automatic modeling assembly, the system automatically selects the cross-section type according to the bridge width, calculates the plate thickness and stiffener parameters, and realizes the cross-section self-adaptation by dynamically adjusting the primitive dimensions. In this embodiment, the box spacing XJJ = 155.25 cm, and the web thickness FB-T is defaulted to 1.6 cm. The system loft the cross-section along the three-dimensional route according to the preset accuracy, dynamically generates the diaphragm spacing according to the span length, and completes the model assembly in combination with the spatial constraint logic. The finally generated BIM model contains 3 box rooms and 60 diaphragms.

[0103] The system outputs a three-dimensional BIM model and the engineering quantity budget. In this embodiment, the error rate of the engineering quantity budget is 1.9%, meeting the accuracy requirements. The generated BIM model adopts the.iam and.ipt formats of Inventor and contains Attribute mark parameters, which is convenient for subsequent project management and quick query and modification during the construction process.

[0104] Through the application of this embodiment, the efficient and precise design of the steel box girder bridge with complex curvature is realized, providing reliable technical support for the bridge engineering construction with special terrain and complex structure.

[0105] In summary, the present invention effectively solves the problems of low efficiency, insufficient accuracy, poor collaboration, etc. existing in the traditional design method of steel box girder bridges by introducing intelligent and standardized design means, and provides a more efficient, accurate and intelligent solution for the design of steel box girder bridges.

[0106] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-dimensional automated design system for steel box girder bridges based on Inventor, characterized in that: Includes the following modules: A data input and control module, used to receive and store bridge width, bridge span arrangement, curvature radius, three-dimensional route data and designed pre-camber data; The 3D route modeling module generates 3D curves through spatial coordinate data and corrects them into design lines with pre-camber through the pre-camber superposition engine; Parametric component library module, with built-in standard section library and partition unit library; The standard section library includes multi-chamber parametric templates, which dynamically match the number of chambers and the width of a single chamber through unique identification and bridge width; The diaphragm unit library generates derivative models of beams and transverse ribs based on pile number driving; Modeling rule control module, embedded with preset rule engine, is used to automatically select section type, calculate plate thickness and stiffening rib parameters according to bridge width, and realize section adaptation by dynamically adjusting element size; The automatic modeling and assembly module performs section lofting along the 3D route according to the preset accuracy and lofting interval, dynamically generates the partition spacing according to the span length, and completes the model assembly in combination with the space constraint logic; The output module outputs a three-dimensional BIM model and a construction quantity budget, wherein the construction quantity budget is generated by dynamically associating component codes with model parameters.

2. The three-dimensional automated design system for steel box girder bridges based on Inventor according to claim 1 is characterized in that: The three-dimensional route modeling module fits the corrected design line through the least square method to eliminate elevation errors and triggers recalculation when the error exceeds the limit.

3. The three-dimensional automated design system for steel box girder bridges based on Inventor according to claim 1 is characterized in that: The pre-camber overlay engine generates a pre-camber curve through finite element analysis, and corrects it point by point with the original route data to ensure that the elevation error is less than the error threshold generated by the finite element analysis.

4. The three-dimensional automated design system for steel box girder bridges based on Inventor according to claim 1 is characterized in that: The partition unit library realizes dynamic model derivation through iPartFactory, and automatically calculates the partition spacing and positioning parameters based on the span section, span clearance, curvature radius and stiffening rib type.

5. The three-dimensional automated design system for steel box girder bridges based on Inventor according to claim 1 is characterized in that: The engineering quantity budget is dynamically associated with the BIM model through the XML format, and a unit conversion coefficient is added to compress the statistical error to a preset range.

6. The three-dimensional automated design system for steel box girder bridges based on Inventor according to claim 1 is characterized in that: The modeling rule control module dynamically adjusts the flange width, top and bottom plate dimensions, number of stiffening ribs, and cross-section slope through iLogic pseudo-code rules, and the rules automatically select a preset width value based on the top plate longitudinal rib type.

7. The three-dimensional automated design system for steel box girder bridges based on Inventor according to claim 1 is characterized in that: The layout interval of the automatic modeling and assembly module can be dynamically adjusted according to the modeling accuracy requirements, the interval at the bend is smaller than the straight line segment, and the layout accuracy is controlled by feedback of the section positioning error at the key stake number.

8. The three-dimensional automated design system for steel box girder bridges based on Inventor according to claim 1 is characterized in that: The section templates of the standard section library calculate design parameters through modular design and automatically match multi-chamber combinations based on the bridge width range.

9. A three-dimensional automated design method for a steel box girder bridge based on the three-dimensional automated design system for a steel box girder bridge based on Inventor according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Input the bridge width, span layout and 3D route data to generate the design line with pre-camber; S2: Call the standard section template according to the bridge width range and the curvature radius in the flat curve parameters, and dynamically adjust the section parameters through the rule engine; S3: Adjust the layout interval according to the model accuracy requirements along the three-dimensional route, and realize model layout based on cross-section contour recognition; S4: Calculate the location and quantity of the diaphragm according to the span length, longitudinal rib type and span clearance, generate a derivative model with the pile number as the key and complete the spatial constraint assembly; S5: Output 3D BIM model, construction drawings and associated bill of quantities.

10. The three-dimensional automated design method for steel box girder bridge according to claim 9, characterized in that: The spatial constraint assembly includes checking the positioning errors of the derived model and the lofted model through coplanar, distance and point constraint logic, and triggering parameter correction when the error exceeds the tolerance.