Three-dimensional automatic design system and method for steel box girder bridge based on Inventor

Abstract

The invention discloses an Inventor-based three-dimensional automatic design system and method for a steel box girder bridge, and belongs to the technical field of three-dimensional modeling numerical control programs, and the system comprises a data input and control module which is used for receiving and storing bridge width, bridge span arrangement, curvature radius, three-dimensional route data and design pre-camber data; a standard section library and a partition unit library are arranged in the parameterized component library module; the modeling rule control module is embedded into a preset rule engine; the automatic modeling and assembling module is used for carrying out section lofting along a three-dimensional route according to preset precision and lofting intervals; and the output module is used for outputting the three-dimensional BIM model of the steel box girder, a construction drawing and an engineering quantity budget result. According to the method, automatic modeling and assembling are achieved, the system can automatically loft the section along the three-dimensional route according to the preset precision, the partition plate distance is dynamically generated according to the steel bridge data, model assembling is completed in combination with the space constraint logic, and the manual adjustment and modeling time is greatly shortened.

Description

Technical Field

[0001] The invention relates to the technical field of three-dimensional modeling numerical control programs, and in particular to an Inventor-based three-dimensional automated design system and method for a steel box girder bridge. Background Art

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

[0003] In the traditional steel box girder bridge design process, manual experience occupies a dominant position, which brings about core problems such as low efficiency, insufficient precision, and poor coordination. Engineers need to manually adjust key parameters such as bridge width and span during design, and modify geometric elements one by one. The modeling process is time-consuming and labor-intensive, and often takes dozens of hours to complete. For example, when making key decisions such as section type selection and matching the number of chambers, due to the lack of assistance from a standardized rule engine, it is completely dependent on the designer's personal experience, which not only prolongs the design cycle, but also easily leads to design errors due to human negligence. In addition, the partition assembly process requires repeated positioning of static components in the model library, especially when facing complex curvature sections and calculating cross slopes, which takes longer and greatly affects the design efficiency.

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

[0005] The fragmentation of output and poor coordination are also a major pain point in the design of traditional steel box girder bridges. BIM models, construction drawings and bills of quantities usually need to be generated by switching between multiple software, resulting in a broken data link. For example, when calculating the quantity of work, it is necessary to manually match components with price lists, which makes the budget error rate exceed 2%; when marking drawings, it is also necessary to check the model parameters twice, with an error rate of 1.5%, which makes it difficult to meet the strict requirements of integrated delivery of EPC projects.

[0006] Although basic parametric modeling has been achieved in the existing technology, there are still significant defects. It lacks a rule engine for automatically deciding the number of boxes and still relies on manual input; it does not integrate finite element analysis and elevation correction logic, resulting in improper pre-camber processing; the location of the partition depends on a fixed template, which is difficult to adapt to the curvature and cross slope changes; the engineering quantity data is not dynamically associated with the model, forming a data island. These problems make the existing patented technology unable to meet the intelligent and standardized needs 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 implemented through the following technical solutions: An Inventor-based 3D automated design system for steel box girder bridges, including the following modules: The data input and control module is used to receive and store the bridge width, span arrangement, curvature radius, three-dimensional route data and designed pre-camber data; the three-dimensional route modeling module generates a three-dimensional curve through spatial coordinates, and corrects it to a designed line with pre-camber through a pre-camber superposition engine; The parametric component library module has a built-in standard section library and diaphragm unit library. The standard section library contains multi-chamber parametric templates, which dynamically matches the number of chambers and various section parameters with the bridge width through unique identification. The diaphragm unit library generates derivative models of beams and transverse ribs based on pile number drive. 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 can loft the cross section along the three-dimensional route according to the preset accuracy, automatically generate the partition spacing according to the data such as span section, span clearance, curvature radius and stiffening rib type, and complete 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.

[0010] 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 of Inventor comprises the following steps: 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: Dynamically adjust the layout interval according to the modeling accuracy along the 3D route, and realize model layout based on cross-section contour recognition; S4: Calculate the location and quantity of the diaphragm according to the span, the clear distance of the span, the type of longitudinal ribs and the clear distance of the span, 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.

[0011] Furthermore, 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.

[0012] Furthermore, the partition unit library realizes dynamic model derivation through iPartFactory, and the derivation logic automatically calculates the partition spacing and positioning parameters based on the span section, span clearance, curvature radius and stiffening rib type.

[0013] Furthermore, 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.

[0014] Furthermore, 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.

[0015] Furthermore, the layout interval of the automatic modeling and assembly module is 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 cross-section positioning error at the key stake number. The accuracy requirement means that the user needs to adjust the modeling accuracy by customizing the interval distance. Generally, the interval at the straight line is recommended to be 3m, and the interval at the bend and key stake number is recommended to be less than 1m; during the assembly process, the partition positioning calculation system has the function of automatically calculating the positioning information, and the general deviation is <5mm.

[0016] Furthermore, the section templates of the standard section library calculate design parameters through modular design and automatically match the section templates based on the bridge width range.

[0017] Furthermore, the spatial constraint assembly includes verifying the positioning error between the derived model and the lofted model through coplanar, distance and point constraint logic, and triggering parameter correction when the error exceeds the tolerance.

[0018] Furthermore, 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.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention automates modeling and assembly. The system can automatically lay out sections along three-dimensional routes with preset accuracy, automatically generate partition spacing based on data such as span section, span clearance, curvature radius and stiffening rib type, and complete model assembly in combination with spatial constraint logic, which greatly reduces the time for manual adjustment and modeling, and shortens the modeling process from tens of hours in traditional methods to several hours or even shorter, significantly improving design efficiency. Through the parametric component library module and modeling rule control module, the system can automatically match the section type, calculate the plate thickness and stiffening rib parameters according to the input parameters such as bridge width and span, and dynamically adjust the size of the graphics element to achieve section adaptation, avoiding the tedious process of modifying geometric graphics one by one in the traditional method, and speeding up the design progress.

[0020] 2. The system of the present invention has a built-in standardized rule engine, which can automatically select the section type, calculate the plate thickness and stiffening rib parameters according to bridge parameters such as bridge width, without relying entirely on the designer's personal experience, reducing design errors caused by human negligence and improving the standardization and quality of the design. The partition unit library generates derivative models of beams and cross ribs based on the pile number drive, and automatically calculates the partition spacing and positioning parameters according to the span length, curvature radius and stiffening rib type, realizing the dynamic assembly of partitions, adapting to the design requirements of bridges with different spans and curvatures, and solving the problem that the partition assembly in the traditional method relies on the static model library and is difficult to adapt to complex structures.

[0021] 3. The system of the present invention can output three-dimensional BIM models, construction drawings and associated bills of quantities, and the quantity budget is generated by dynamically associating component codes with model parameters, avoiding the problem of data link breakage caused by switching between multiple software to generate different results in traditional methods, realizing the integrated output of design results, improving collaborative efficiency, and meeting the strict requirements of integrated delivery of EPC projects. The dynamic data association between BIM models, construction drawings and bills of quantities 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.

[0022] 4. The system of the present invention can handle the design of steel box girder bridges with different bridge widths, spans, curvature radii and other parameters. Whether it is a conventional straight-segment bridge or a curved bridge with complex curvature, accurate model generation and assembly can be achieved by dynamically adjusting parameters such as the lofting interval and partition spacing, providing reliable technical support for the construction of bridge projects with complex terrain and special structures. Based on the system's preset rules and parameters, users can modify some parameters according to actual needs, such as web thickness, etc., which reflects the flexibility of the system and can meet the specific requirements of different projects. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0024] An Inventor-based 3D automated design system for steel box girder bridges, including the following modules: The data input and control module is used to receive and store the bridge width, span arrangement, curvature radius, three-dimensional route data and designed pre-camber data; the three-dimensional route modeling module generates a three-dimensional curve through spatial coordinates, and corrects it to a designed line with pre-camber through a pre-camber superposition engine; 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; In terms of input parameters, the bridge width (QW) ranges from 200cm to 1656cm, the data type is a positive number, and directly determines the number of chambers (XLN) and the width of a single chamber (XLW); The span layout is defined in the format of 30m+50m+30m to define the span distribution and beam segment division, and the curvature radius (R) is not less than 300m; The distance (ZS) between the center of the main beam and the design line is in the range of 1-10m, which is used to determine the offset between the main beam and the design line. The 3D route data is a set of X / Y / Z coordinate points stored in CSV format, which is used to generate the 3D route model. The design pre-camber (ΔZ pre-camber) is based on the pre-camber data extracted from the MIDAS calculation model. For data storage, a MySQL database is used and fields are stored in JSON format, including but not limited to bridge_width, span_arrangement, curvature_radius, etc. In actual operation, the formula Z new =Z 原始 +ΔZ 预拱 , using the ΔZ curve generated by finite element analysis to correct the route elevation point by point; To ensure accuracy, the elevation error at key pile numbers (such as bridge piers and mid-span) is strictly controlled within ±2mm, and the least squares method is used to fit the corrected route.

[0025] The parametric component library module has a built-in standard section library and diaphragm unit library; the standard section library contains multi-chamber parametric templates, which automatically match the parametric section with the bridge width through a unique identifier; the diaphragm unit library generates derivative models of beams and transverse ribs based on the pile number drive; The partition unit library realizes dynamic model derivation through iPartFactory, and the derivation logic automatically calculates the partition spacing and positioning parameters based on the span, the clear distance of the span, the curvature radius and the stiffening rib type; The section template of the standard section library generates a single box width through modular design, and automatically matches the combination of multiple boxes based on the bridge width range; In terms of dynamic matching of standard section libraries, the logic of chamber quantity (XLN) is: When the width of a single box (XLW) = 200cm, if the bridge width (QW) ≤ 1256cm, it is a double box double room (XLN = 2); if 1256cm<QW≤1656cm, it is a triple box three room (XLN = 3); The modular XLW can be selected as 200cm, 260cm, 320cm, and 380cm. In terms of flange width (YYW), when the top plate longitudinal rib is a U rib, YYW=185.5cm; when it is a plate rib, YYW=178cm; For the dynamic generation of the partition unit library, the iPartFactory derived logic uses the pile number as the primary key. The main parameters for pile number calculation include the span section, the clear distance of the span, the curvature radius, and the stiffening rib type; the iPartFactory data set parameters include the bridge width, top plate thickness, main beam structure center distance, slope, flange width, web thickness, single box width, beam height, bottom plate thickness, and longitudinal rib size; The spacing between the side span diaphragms is usually 500cm (U rib) or 300cm (plate rib); if the clear span minus the number of beams multiplied by the regular spacing is less than 130cm, the special spacing is 400cm (U rib) or 200cm (plate rib); In the calculation of the spacing of mid-span partitions, the special spacing of odd-numbered spans is equal to the span divided by 2 minus the number of large beams on one side multiplied by the regular spacing; the special spacing of even-numbered spans is equal to the span divided by 2 minus the number of large beams on one side multiplied by the regular spacing, plus 250cm (U rib) or 150cm (plate rib).

[0026] 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 modeling rule control module dynamically adjusts the flange width through pseudo-code rules, and the rules automatically select a preset width value based on the top plate longitudinal rib type; In terms of parameter mapping logic, the box spacing (XJJ) is calculated as XJJ = (QW − YYW − XLW × XLN) / (XLN − 1), and the beam height (ZL-H) is taken as 1 / 25 of the largest element in the bridge length parameter array; For example, the ZL-H corresponding to a span of 50m is 2m), the web thickness (FB-T) defaults to 1.6cm (when the span is less than 7000cm), and users can also modify it according to actual needs; In terms of pseudocode 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 185.5cm; when the longitudinal rib of the top plate is a plate rib, the flange width (YYW) is 178cm.

[0027] The automatic modeling and assembly module sets out the cross section along the 3D route with preset accuracy, dynamically generates the diaphragm spacing according to the bridge parameters, and completes the model assembly in combination with the spatial constraint logic; The layout interval of the automatic modeling and assembly module is 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 cross-section positioning error at the key stake number; The accuracy requires that the general straight line should be at least 3m apart, and the bends and key piles should be at least less than 1m; during the assembly process, the partition positioning calculation system has the function of automatically calculating the positioning information, and the general deviation is <5mm.

[0028] The three-dimensional route is fitted by the three-dimensional route modeling module through the least square method to correct the design line, eliminate the elevation error, and trigger recalculation when the error exceeds the limit; Specifically, at key stakes, the interval between stakeouts is no more than 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 value. 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 to generate a 3D route model based on the corrected coordinate points using the B-spline curve algorithm. In terms of precision control, the B-spline accuracy is improved by increasing the density of fitting points. For bends (radius of curvature R<500m), the interval density can be increased to 1m, and for straight segments, the interval can be 3m.

[0029] The spatial constraint assembly includes checking the positioning error between the derived model and the lofted model through coplanar, distance and point constraint logic, and triggering parameter correction when the error exceeds the limit; According to the above-mentioned partition unit, firstly, the parametric model is generated through iPartFactory with the pile number as the primary key; Then, assembly verification is performed, including coplanar constraints (tolerance ±1mm) and distance constraints (tolerance ±2mm); If there is an out-of-tolerance situation during the assembly process, the system will trigger parameter correction to ensure that the partition unit can be accurately assembled to the specified position. The entire process is highly automated and can effectively ensure the accuracy and efficiency of assembly.

[0030] An 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; The engineering quantity budget is dynamically associated with the BIM model through XML format, and a unit conversion factor is added to compress the statistical error within a preset range; The generated BIM model adopts Inventor's .iam (assembly file) and .ipt (part file) formats. These files contain attribute marking parameters to facilitate quick query and modification in subsequent engineering management and construction processes. In the engineering quantity estimation part, the system dynamically associates model parameters through 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.

[0031] Construction drawings are generated by automatically extracting model geometric properties into dwg files, with a marking error rate of less than 1%, ensuring the accuracy and professionalism of the construction drawings and meeting the strict requirements of the construction site.

[0032] A three-dimensional automated design method for a steel box girder bridge based on an Inventor-based three-dimensional automated design system for a steel box girder bridge comprises the following steps: 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: Dynamically adjust the layout interval according to the modeling accuracy along the 3D 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. Example

[0033] According to the above implementation 1, when the bridge width QW=1280cm, the single box width XLW=200cm, the span is 50m, and the curvature radius is 400m, the bridge width, bridge span layout, curvature radius, three-dimensional route data and design pre-camber data are input into the system; The bridge width QW=1280cm, the bridge span is 50m single span, and the curvature radius R=400m. The system performs finite element analysis through the pre-camber superposition engine, generates a 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 the pre-camber correction is 1.8mm, which meets the accuracy requirements.

[0034] According to the bridge width QW=1280cm and the single box width XLW=200cm, the system matches the double box double chamber (XLN=2) section template from the standard section library; At the same time, according to the span and curvature radius, the system generates derived models of beams and transverse ribs from the diaphragm unit library based on the pile number drive; In this embodiment, the number of large beams in the side span is 2, and the special spacing is 400cm (U rib); the number of large beams in the middle span is 3, and the special spacing is 10m; Modeling rule control and automatic modeling assembly, the system automatically selects the section type, calculates the plate thickness and stiffening rib parameters according to the bridge width, and realizes section adaptation by dynamically adjusting the element size. In this embodiment, the box spacing XJJ = 694.5cm, and the web thickness FB-T defaults to 1.6cm; The system lays out the section along the three-dimensional route with preset accuracy, dynamically generates the partition spacing according to the span length, and completes the model assembly in combination with the space constraint logic. The final generated BIM model contains 2 boxes and 45 partitions.

[0035] Output and verification, the system outputs a three-dimensional BIM model and a quantity budget. In this embodiment, the quantity budget error rate is 1.5%, which meets the accuracy requirements. The generated BIM model uses Inventor's .iam and .ipt formats and contains Attribute marking parameters to facilitate subsequent project management and quick query and modification during the construction process. Example

[0036] According to the above implementation 1, when the bridge width QW=1500cm, the single box width XLW=260cm, the span is 60m, and the curvature radius is 600m, the bridge width, span layout, curvature radius, three-dimensional route data and design pre-camber data are input into the system; The bridge width QW = 1500cm, the span is 60m single span, and the curvature radius R = 600m. The system performs finite element analysis through the pre-camber superposition engine, generates a 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 1.2 mm, which meets the accuracy requirements; According to the bridge width QW=1500cm and the single box width XLW=260cm, the system matches the section template of three boxes and three chambers (XLN=3) from the standard section library; At the same time, according to the span and curvature radius, the system generates derived models of beams and transverse ribs from the diaphragm unit library based on the pile number drive. In this embodiment, the number of large beams in the side span is 3, and the special spacing is 350cm; the number of large beams in the middle span is 4, and the special spacing is 12m; Modeling rule control and automatic modeling assembly, the system automatically selects the section type, calculates the plate thickness and stiffening rib parameters according to the bridge width, and realizes section adaptation by dynamically adjusting the element size. In this embodiment, the box spacing XJJ = 187.25cm, and the web thickness FB-T defaults to 1.6cm; The system lays out the cross section along the three-dimensional route with preset accuracy, dynamically generates the partition spacing according to the span length, and completes the model assembly in combination with the spatial constraint logic. The final BIM model contains 3 boxes and 52 partitions; The system outputs a three-dimensional BIM model and a quantity budget. In this embodiment, the quantity budget error rate is 1.6%, which meets the accuracy requirements. The generated BIM model uses Inventor's .iam and .ipt formats and contains Attribute tag parameters to facilitate subsequent project management and quick query and modification during the construction process.

[0037] Through the application of this embodiment, efficient and accurate design of steel box girder bridges is achieved, providing reliable technical support for the construction of large-scale cross-sea bridge projects. Example

[0038] According to the above implementation 1, when the bridge width QW=1656cm, the single box width XLW=380cm, the span is 70m, and the curvature radius is 300m, the bridge width, bridge span layout, curvature radius, three-dimensional route data and design pre-camber data are input into the system; The bridge width is QW = 1656cm, the span is 70m single span, and the curvature radius is R = 300m. The system performs finite element analysis through the pre-camber superposition engine, generates a 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 2.0 mm, and is corrected to ±1.5 mm by least squares fitting, meeting the accuracy requirements; According to the bridge width QW=1656cm and the single box width XLW=380cm, the system matches the section template of three boxes and three chambers (XLN=3) from the standard section library; At the same time, according to the span and curvature radius, the system generates derived models of beams and transverse ribs from the diaphragm unit library based on the pile number drive. In this embodiment, the number of large beams in the side span is 4, and the special spacing is 300cm; the number of large beams in the middle span is 5, and the special spacing is 15m; Modeling rule control and automatic modeling assembly, the system automatically selects the section type, calculates the plate thickness and stiffening rib parameters according to the bridge width, and realizes section adaptation by dynamically adjusting the element size. In this embodiment, the box spacing XJJ = 155.25cm, the web thickness FB-T defaults to 1.6cm, the system sets out the section along the three-dimensional route with preset accuracy, dynamically generates the partition spacing according to the span length, and completes the model assembly in combination with the space constraint logic. The final generated BIM model contains 3 boxes and 60 partitions.

[0039] The system outputs a 3D BIM model and a quantity budget. In this embodiment, the quantity budget error rate is 1.9%, which meets the accuracy requirements. The generated BIM model uses Inventor's .iam and .ipt formats and contains Attribute tag parameters, which facilitates quick query and modification during subsequent project management and construction.

[0040] Through the application of this embodiment, efficient and accurate design of steel box girder bridges with complex curvature is achieved, providing reliable technical support for the construction of bridge projects with special terrain and complex structures.

[0041] In summary, the present invention effectively solves the problems of low efficiency, insufficient precision, poor coordination, etc. in the traditional steel box girder bridge design method by introducing intelligent and standardized design means, and provides a more efficient, accurate and intelligent solution for the design of steel box girder bridges.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to 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 three-dimensional route modeling module generates a three-dimensional curve through spatial coordinate data, and corrects it into a design line 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. A three-dimensional automated design method for a steel box girder bridge based on the system of claim 1, 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.

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. The three-dimensional automated design method for steel box girder bridge according to claim 2, 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.

10. The three-dimensional automated design system for steel box girder bridges based on Inventor according to claim 1, 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.