A method for constructing information-physical mapping and twin of prefabricated beam combined structure body reinforcement

Abstract

The application discloses a kind of information physical mapping and twin body construction method of fabricated beam combination structure body reinforcement, in view of the problems of "quantity without mode" of prefabricated component reinforcement in prior art and cannot be three-dimensional visualization, the application successively constructs the prefabricated rectangular reinforcement skeleton area model containing bottom longitudinal reinforcement, waist muscle, tensioning muscle and stirrup, and the prefabricated special-shaped concrete filling area model, and the two are spliced to form complete prefabricated beam;Then based on the upper surface profile of prefabricated beam, cast-in-place combination area model is constructed and cast-in-place reinforcement entity information is generated, the cast-in-place reinforcement bottom elevation is automatically set as the sum of the top elevation of prefabricated stirrup and the thickness of protective layer by preset avoidance rule, to realize spatial hierarchical avoidance;Finally, the three part models are combined and associated in the same coordinate system, and the quantities are automatically classified and counted according to the four categories of prefabricated concrete, prefabricated reinforcement, cast-in-place concrete and cast-in-place reinforcement.The application realizes the three-dimensional entity of prefabricated beam reinforcement and the integration of all elements.

Description

Technical Field

[0001] This invention relates to the field of prefabricated concrete building construction and building information modeling (BIM) quantity calculation technology, specifically to a method for information physical mapping and twin construction of the main body reinforcement of prefabricated beam composite structures. Background Technology

[0002] Currently, my country's prefabricated building market has entered a stage of high-quality development, with applications covering diverse infrastructure fields such as affordable housing projects and underground utility tunnels. However, a long-standing structural defect in the existing BIM technology system is "quantity without model." Specifically, under current technology, although the reinforcement information of prefabricated concrete components can be statistically analyzed through parametric input, the core reinforcing bars (longitudinal main bars, truss bars, closed stirrups, etc.) cannot generate a one-to-one three-dimensional solid geometric representation corresponding to the physical component in the BIM environment. The reinforcement data is only attached to the component model as an abstract attribute table.

[0003] This deficiency leads to several technical consequences: First, information visualization is fragmented, as the precast steel reinforcement is not visible in three-dimensional space, making it impossible to support construction handover and collision checks. Second, cross-platform collaborative applications are hindered, as steel reinforcement attribute data is easily lost or mapped incorrectly due to its separation from the geometric model. Third, with the implementation of mandatory industry standards such as the "Code for BIM Modeling of Precast Concrete Components," the "quantity without model" approach is no longer sufficient to meet the delivery requirements for complete model information. Therefore, there is an urgent need for a spatial model construction method that can perform three-dimensional solid mapping of the precast component's steel reinforcement and coordinate it with the cast-in-place portion. Summary of the Invention

[0004] To overcome the problems of "quantity without model" and the inability to collaboratively model prefabricated and cast-in-place components in the existing technologies, this invention provides a cyber-physical mapping and twin construction method for the main body reinforcement of prefabricated beam composite structures. The model constructed based on this method not only contains three-dimensional solid reinforcement information, but also enables automatic classification and extraction of engineering quantities.

[0005] To address the shortcomings of traditional BIM quantity calculation, which fails to generate 3D entities of precast beam reinforcement and lacks spatial visualization and interaction, this invention prioritizes the construction of a precast rectangular reinforcement skeleton model as the foundation, followed by a precast irregular concrete filling model. These two models are then joined to form a complete precast beam structure with physical characteristics. Furthermore, to incorporate the cast-in-place reinforcement into a unified 3D system, this method constructs a cast-in-place composite area model based on the upper surface contour of the precast beam and generates 3D entity information for the cast-in-place reinforcement. To ensure the structural safety and spatial rationality of the overall structure, preset spatial avoidance rules are employed to automatically adjust the 3D coordinates of the cast-in-place reinforcement, ensuring a collision-free and rational layout with the stirrups in the precast rectangular skeleton area. Through these technical means, the previously abstract data reinforcement is transformed into 3D entities with real spatial geometric positions, achieving visualized mapping of precast beam reinforcement and completely resolving the technical bottleneck of unsearchable and non-interactive reinforcement information.

[0006] To address the structural challenge of potential physical interference between cast-in-place reinforcement and the top stirrups of precast components, this solution specifically sets the bottom elevation of the cast-in-place reinforcement in the spatial avoidance rules to the top elevation of the stirrups in the precast rectangular reinforcement cage area plus the preset concrete cover thickness. With this setting, the cast-in-place reinforcement can be precisely positioned on the stirrup plane separated by the cover thickness during construction, forming a clear vertical layer boundary between the two. Under this working logic, the system automatically calculates and matches the cross-sectional heights of the upper and lower parts, ensuring an absolutely safe clearance between the cast-in-place reinforcement and the precast stirrups before pouring, effectively avoiding rework or structural hazards caused by reinforcement overlap.

[0007] For the sake of maintaining the overall structural continuity of the composite beam, this invention configures the precast rectangular steel reinforcement skeleton model to include bottom longitudinal main reinforcement bars, web reinforcement bars, and stirrups, with the stirrups extending upwards to the top of the cast-in-place composite area. With this configuration, the stirrups in the precast section and the concrete structure in the cast-in-place section can form a continuous closed stirrup system that satisfies the overall structural stress. This structural connection method ensures the continuity of shear force transfer between the stirrups in the post-cast and precast sections. Its working principle allows the composite beam to effectively confine the internal concrete during the stress stage, significantly improving the beam's shear capacity and overall stiffness.

[0008] To address the challenge of modeling complex, irregular cross-sections of prefabricated beams using standard family libraries, this invention employs a custom contour line to define the cross-sectional boundaries of the irregular region point-by-point when constructing the model of the prefabricated irregular concrete infill area. The corresponding extruded or lofted solids are then directly generated through geometric filling operations. This geometric generation method does not rely on built-in irregular family templates in the software; its process essentially involves "filling" in three-dimensional space based on the drawing outline to generate a solid. This method can flexibly adapt to arbitrarily complex irregular geometric shapes, fundamentally breaking the functional limitations of standard component libraries and significantly improving the applicability and efficiency of modeling irregular components.

[0009] To incorporate the three-dimensional reinforcement information of the cast-in-place layer into the same solid modeling framework as the precast sections, this invention configures the cast-in-place composite zone model to include the cast-in-place concrete layer, upper continuous longitudinal reinforcement, and support negative reinforcement. In this way, during model construction, the upper continuous longitudinal reinforcement and support negative reinforcement appear as three-dimensional solids, with their spatial coordinates closely corresponding to the underlying precast concrete filling area and precast steel reinforcement skeleton area. The direction, specifications, and anchorage length of all cast-in-place reinforcing bars can be visually viewed in the model, facilitating verification and inspection of the stress conditions of the cast-in-place nodes by designers and construction personnel.

[0010] To address the issue of accidental modifications leading to changes in beam elevation or reinforcement parameters during multi-step modeling operations, this invention adds a locking operation and elevation correction steps after generating the precast rectangular steel reinforcement skeleton area model. Specifically, the process involves first "locking" all parameters of the current precast rectangular steel reinforcement skeleton area model, making it an unmodifiable baseline model; then, fine-tuning the section height and beam top elevation based on the cast-in-place layer thickness. This mechanism, while closing off parameter modification channels, reserves accurate structural interfaces for subsequent irregular filling areas and cast-in-place concrete modules. Its working mode directly avoids three-dimensional coordinate offsets of the bottom longitudinal reinforcement and stirrups caused by subsequent operational errors, thereby ensuring that the reinforcement layout of the entire model highly conforms to design specifications.

[0011] To address the data gaps caused by inconsistent geometric coordinates and asynchronous parameters among multiple independently constructed models, this system employs a configuration that interconnects the precast rectangular skeleton area model, the precast irregular-shaped infill area model, and the cast-in-place composite area model within the same geometric coordinate system on the same BIM platform. In this mode, the reinforcement parameters in the 3D model and the contour parameters of the precast irregular-shaped concrete infill area can be modified in a linked manner. During actual operation, when designers adjust the cross-sectional contour or reinforcement specifications of precast components, the geometry and quantities of other related areas are automatically and dynamically updated. This linkage mechanism effectively eliminates the data silos that may result from step-by-step modeling, significantly improving the efficiency and accuracy of multi-disciplinary collaborative modeling.

[0012] To address the inefficiency of traditional quantity surveying methods that rely on manual calculations and easily confuse the boundaries between precast and cast-in-place quantities, this invention adds an automatic quantity classification and statistical step after constructing the cast-in-place composite area model. The core implementation of this step involves retrieving all completed 3D solid reinforcement information and concrete models. The system calculates the weight of each specification of reinforcement and the volume of concrete separately for two main categories: precast components (rectangular skeleton + irregular infill) and cast-in-place composite components. This automatic classification process automatically filters and performs mathematical statistics based on the family type of component instances in the model. This provides clear and independent comparative data for the "precast part" and "cast-in-place part" in the output results, accurately avoiding duplicate calculations in overlapping areas.

[0013] To make the generated project cost data more intuitive and facilitate subsequent cost management, this invention further categorizes the calculation results into four subcategories—"prefabricated concrete," "precast steel reinforcement," "cast-in-place concrete," and "cast-in-place steel reinforcement"—in the automatic quantity classification output stage, generating detailed statistical tables. These detailed tables can be directly exported to spreadsheets and integrated with external professional cost management software. The independent presentation of these four subcategories allows project managers to quickly identify the material usage of different components during cost accounting, and its standardized data structure provides a seamless data interface for subsequent project settlement and bidding quotations.

[0014] To fully realize the information value of 3D models throughout the entire construction lifecycle, this invention constructs 3D solid steel and concrete models. These models are not only used for steel clash detection and construction simulation briefings in a BIM environment, but also serve as the digital twin foundation for the prefabricated beam composite structure. Through this physical information mapping model, the project team can conduct visualized hoisting simulations and process deductions within the model. Simultaneously, during construction, the model can map the acquired construction data in real time, enabling data traceability and spatial visualization interaction throughout the entire construction lifecycle. Thus, this invention extends the traditional static quantity calculation model into a traceable and interactive dynamic information physical carrier.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. Break through the bottleneck of "quantity without form" and realize the physical spatial mapping and visual interaction of rebar information.

[0017] This invention is the first to generate a complete three-dimensional solid geometric model of the reinforcing steel bars of prefabricated components within a BIM environment. This model includes not only longitudinal main bars, stirrups, and web bars, but also tie bars connecting two rows of web bars, forming a complete built-in reinforcing steel skeleton system. By transforming the abstract reinforcing steel quantity data of prefabricated beam components into a physical three-dimensional entity with actual spatial coordinates, it completely solves the pain points of existing technologies where prefabricated reinforcing steel bars are "invisible, unsearchable, and non-interactive" in three-dimensional space. This enables the model to directly support construction briefings, on-site reinforcing steel tying guidance, collision checks, and detailed node design.

[0018] 2. Achieve full integration and data connectivity between precast and cast-in-place processes.

[0019] This invention enables step-by-step modeling and seamless combination of the prefabricated rectangular steel reinforcement skeleton area, irregular infill area, and cast-in-place composite area within the unified coordinate system of the same BIM software platform. This method overcomes the problems of data fragmentation, format incompatibility, and mapping errors caused by traditional multi-software collaboration (such as the separation of civil engineering software and steel reinforcement quantity calculation software), ensuring the integrity, accuracy, and lifecycle continuity of the component's steel reinforcement and concrete model information, and meeting the mandatory industry standard requirements for the delivery of model information integrity.

[0020] 3. Adopt intelligent space avoidance rules to ensure structural safety and construction feasibility.

[0021] This invention introduces pre-defined spatial avoidance rules during the modeling process. By precisely positioning the elevations of cast-in-place and precast components, it achieves accurate spatial combination of the components. These rules automatically resolve the spatial collision problem between cast-in-place reinforcing bars and precast stirrups during the model construction phase, reducing manual intervention and rework errors, and providing precise spatial hierarchy for subsequent construction simulation and handover.

[0022] 4. Adaptable to complex irregular cross-sections, breaking through the limitations of standard family libraries.

[0023] This invention proposes a "geometric filling" modeling method for irregularly shaped prefabricated components, which does not rely on the parametric family templates built into BIM software. By defining a closed contour and automatically stretching or lofting to generate solids, this invention can flexibly and quickly handle prefabricated beams with arbitrarily complex cross-sections, greatly expanding the application scope of BIM modeling in non-standard components.

[0024] 5. One-click quantity calculation and classification statistics significantly improve the accuracy of cost control.

[0025] After generating a complete 3D model, this invention supports one-click retrieval of all entity information and automatically completes the quantity classification, statistics, and summary of the project according to four categories: "prefabricated concrete," "precast steel reinforcement," "cast-in-place concrete," and "cast-in-place steel reinforcement." This method completely solves the problem of being unable to model the quantities of prefabricated beam components, overcoming the technical limitation of "having a model but no quantity" for prefabricated beam components. The output standard detailed table can be directly connected to cost estimation software, providing accurate data support for project budgeting, settlement, and cost control. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0027] Figure 1 This is a three-dimensional schematic diagram of the BIM model of the spatial combination of prefabricated and cast-in-place composite beam components described in this invention. The diagram mainly shows the spatial hierarchy of the prefabricated and cast-in-place parts.

[0028] Figure 2 This is a structural schematic diagram of the three-dimensional model of the prefabricated concrete beam with built-in reinforcing bars according to the present invention. The diagram shows in detail the spatial arrangement and tension structure of the bottom longitudinal reinforcement, stirrups, web reinforcement and tie bars.

[0029] Figure 3 This is a three-dimensional structural diagram of the upper tensile reinforcement, such as the continuous upper reinforcement and the negative reinforcement at the supports, of the cast-in-place concrete beam described in this invention.

[0030] Figure 4 This is a three-dimensional rendering of the prefabricated and cast-in-place composite beam component constructed according to the present invention and its internal reinforcement.

[0031] Figure 5 This is a schematic diagram of the cross-sectional profile of prefabricated and cast-in-place concrete beam components.

[0032] Figure 6 This is a cross-sectional schematic diagram showing the internal reinforcement of prefabricated and cast-in-place beam components in concrete structures.

[0033] Figure 7 This is a schematic diagram of the longitudinal arrangement of the overall reinforcement of a prefabricated and cast-in-place composite beam member. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] The following is in conjunction with the appendix Figures 1-7 This invention provides a detailed description of the cyber-physical mapping and twin construction method for the main body reinforcement of prefabricated beam composite structures. In this specific embodiment, the BIM modeling platform used can be general-purpose 3D building information modeling software such as domestically produced BIM software; however, the technical means of this invention are not limited to a specific software platform, and the operational steps performed are a general modeling process.

[0036] To facilitate understanding, the designations of spatial components and reinforcing bars are clarified in conjunction with the attached diagram: In Figure 1 In the spatial combination model shown, the area pointed to by arrow 1 corresponds to the precast rectangular steel reinforcement skeleton area described in this invention, the area pointed to by arrow 2 corresponds to the precast irregular concrete filling area, and the area pointed to by arrow 3 corresponds to the cast-in-place combination area. Figure 2 In the schematic diagram of the precast steel reinforcement model shown, arrow 1 points to the bottom longitudinal reinforcement of the precast section, and arrow 2 points to the stirrups and web reinforcement of the precast section. Figure 3 In the schematic diagram of the cast-in-place reinforcement shown, arrow 3 points to the upper continuous reinforcement and the support negative reinforcement of the cast-in-place section.

[0037] Step 1: Precise modeling of the precast rectangular steel reinforcement skeleton area

[0038] First, create a new beam-type component in the BIM software. Based on the precast section dimensions indicated in the construction drawings, enter the width and height of the rectangular outline in the properties bar. Then, according to the prefabricated detailed drawings, input the parameters (such as rebar diameter, specifications, number, spacing, and hook type) of the bottom longitudinal reinforcement, stirrups, and web reinforcement into the system. The system automatically associates these input parameters with the previously defined section outline.

[0039] In addition, to constrain the longitudinal stirrups and ensure the stability of the precast zone's compression reinforcement, various parameters of the tie bars should be input, such as their diameter, spacing, and spatial arrangement. These tie bars intersect perpendicularly with the longitudinal stirrups on both sides, forming a complete tie-and-resist system to prevent lateral buckling of the stirrups during concrete pouring or under stress. During parameter configuration, calculation parameters such as anchorage length, lap length, and protective layer thickness can be adjusted according to the current "Code for Design of Concrete Structures" GB 50010. After preliminary calculations and confirmation of model accuracy, a "lock" operation is performed to fix the component's state, making it an uneditable reference model for subsequent steps. Based on this, fine-tuning of the precast beam's cross-sectional height (excluding the cast-in-place layer thickness) and beam top elevation is also necessary to reserve structural space that meets design requirements for subsequent cast-in-place layers and irregularly shaped areas.

[0040] After completing this step, a prefabricated rectangular skeleton area model with complete three-dimensional reinforcement locations is obtained. For example... Figure 2 and Figure 6 As shown, Figure 2 Arrows 1 and 2 clearly show the spatial arrangement of the bottom longitudinal reinforcement, stirrups, waist reinforcement, and tie bars intersecting each other inside the component.

[0041] Step 2: Seamless connection of precast irregular concrete filling area

[0042] For portions of prefabricated beams that cannot be represented by standard rectangular cross-sections, this invention employs a custom "fill-in modeling" technique. First, custom beam components are defined in the BIM software, independent of standard family libraries. Then, based on... Figure 5 and Figure 6 The outline of the irregular region shown is used to define the cross-sectional boundary of the irregular region point by point in the 3D view. By setting the "Edit Elevation" function, the top and bottom elevations of the irregular region are accurately set to ensure precise spatial alignment with the rectangular beam in step one and the subsequent cast-in-place beams.

[0043] Finally, the "geometric fill" operation is performed. Once the system recognizes and selects the closed cross-sectional profile, it automatically generates the corresponding stretched or lofted solid, thus completing the construction of the irregular concrete body. The irregular body constructed in this step shares the same concrete strength grade properties as the rectangular section and is classified as a precast part. After this step is completed, the corresponding... Figure 1 The irregularly shaped concrete entity shown by the middle arrow 2 enables seamless filling of non-standard geometric areas in precast components.

[0044] Step 3: Simultaneous modeling and avoidance of cast-in-place composite concrete and reinforcement

[0045] In the prefabricated precast beams that have already been constructed (including rectangular and irregularly shaped areas, i.e.) Figure 1 Starting from the top surface of the superimposed (arrows 1 and 2) section, the cast-in-place composite part begins to be constructed. First, the system automatically reads the outline of the upper surface of the prefabricated beam below and uses this closed outline as the constraint boundary of the bottom surface of the cast-in-place layer. Then, according to the thickness of the cast-in-place layer given in the drawings, which is usually 80mm to 150mm, the cast-in-place concrete body is generated by horizontal stretching.

[0046] After the cast-in-place concrete layer is generated, the upper reinforcement needs to be configured simultaneously. In the parameter interface, input the specifications, number, and spacing of the upper continuous longitudinal reinforcement, as well as the length and arrangement of the support negative reinforcement. Here, the system uses preset spatial avoidance rules. The core logic of these rules is to achieve precise spatial combination of components by accurately positioning the elevations of the cast-in-place and precast parts. Through this automatic avoidance calculation, the system automatically shifts the three-dimensional coordinates of the cast-in-place reinforcement upwards, ensuring a standard clear distance between the cast-in-place longitudinal reinforcement and the stirrups generated by the lower precast components, avoiding mutual interpenetration and collision in three-dimensional physical space. After completing this step, the desired result can be obtained. Figure 1 The cast-in-place composite area indicated by arrow 3, and as shown by... Figure 3 The upper continuous reinforcement and support negative reinforcement of the cast-in-place zone shown are as follows: Figure 3 The complete integrated model (pointed to by arrow 3).

[0047] Step 4: Logical Combination and Summary of Engineering Quantities

[0048] The model components from the aforementioned steps (precast rectangular skeleton section, precast irregular concrete section, and cast-in-place composite section) are placed in the same BIM project file. A model assembly operation is performed, and precise spatial positioning is achieved through accurate elevation settings, forming a composite component encompassing precast, precast infill, and cast-in-place elements. Next, in the quantity calculation settings, the statistical scope for concrete and reinforcement is clearly defined: concrete is divided into the total volume of precast rectangular and irregular shapes and the volume of cast-in-place reinforcement; reinforcement is divided into precast main reinforcement, stirrups, web reinforcement, tie bars, and the upper main reinforcement of the cast-in-place portion. After executing the "Summary Calculation" command, the system automatically generates a complete quantity report based on built-in calculation rules, categorized into four sub-items: "Assembled Concrete," "Precast Reinforcement," "Cast-in-place Concrete," and "Cast-in-place Reinforcement."

[0049] Ultimately, the following can be obtained: Figure 4 The diagram shows a 3D twin model of the composite beam with complete physical reinforcement spatial positioning, along with a corresponding bill of quantities. This bill of quantities can be exported as an Excel spreadsheet for direct delivery to cost estimators. The generated complete 3D model can be directly used for reinforcement collision checks and construction simulation briefings in a BIM environment, and also serves as the foundation for the digital twin of this prefabricated beam composite structure, enabling physical information mapping and data traceability throughout the entire construction lifecycle. This modeling method, completing the entire process from geometric contour definition to 3D reinforcement entity mapping within the BIM environment, not only meets the delivery requirements of drawings and industry standards but also lays a solid foundation for subsequent construction process simulation and digital delivery.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for solidifying the modeling of the main reinforcement of a prefabricated beam composite structure, characterized in that, Includes the following steps: Construct a model of a prefabricated rectangular steel reinforcement skeleton area, and generate three-dimensional solid steel reinforcement information for the prefabricated rectangular steel reinforcement skeleton area; A precast irregular concrete filling area model is constructed, and the precast irregular concrete filling area model is spliced ​​with the precast rectangular steel skeleton area model to form a complete precast beam structure; Based on the upper surface contour of the precast beam structure, a model of the cast-in-place composite area is constructed, and three-dimensional solid steel information of the cast-in-place steel bars is generated in the model of the cast-in-place composite area. Based on preset spatial avoidance rules, the three-dimensional coordinates of the cast-in-place steel bars are automatically adjusted so that the cast-in-place steel bars and the stirrups in the precast rectangular steel bar skeleton area form a collision-free hierarchical layout in three-dimensional space.

2. The method according to claim 1, characterized in that, The spatial avoidance rules include setting the bottom elevation of the cast-in-place reinforcing bars as the top elevation of the precast rectangular reinforcing bar skeleton area.

3. The method according to claim 1, characterized in that, The precast rectangular steel skeleton area model includes bottom longitudinal main reinforcement, web reinforcement and stirrups. The stirrups extend upward to the top of the cast-in-place composite area to form a continuous closed stirrup system that satisfies the stress of the overall structure.

4. The method according to claim 1, characterized in that, The steps for constructing the precast irregular concrete filling area model include: defining the cross-sectional boundary of the irregular area point by point based on a custom contour line, and generating the corresponding extruded body or lofted entity through geometric filling operation to realize the modeling of the irregular area.

5. The method according to claim 1, characterized in that, The cast-in-place composite zone model includes a cast-in-place concrete layer, a continuous longitudinal reinforcement bar at the top, and negative reinforcement bars at the supports.

6. The method according to claim 1, characterized in that, After generating the model of the precast rectangular steel reinforcement skeleton area, the process also includes a locking operation and an elevation correction step: locking the parameters of the model of the precast rectangular steel reinforcement skeleton area, and adjusting the section height and beam top elevation of the precast rectangular steel reinforcement skeleton area according to the thickness of the cast-in-place layer, so as to reserve space for the cast-in-place structure.

7. The method according to claim 1, characterized in that, The precast rectangular steel reinforcement skeleton area model, the precast irregular concrete filling area model, and the cast-in-place composite area model are interconnected based on the same geometric coordinate system of the same BIM software platform, and the steel reinforcement parameters in the precast rectangular steel reinforcement skeleton area model and the contour parameters in the precast irregular concrete filling area model have a linkage modification function.

8. The method according to claim 1, characterized in that, After the construction of the cast-in-place composite area model is completed, the process also includes the step of automatic classification and statistics of engineering quantities: retrieving all the completed three-dimensional solid steel reinforcement information and concrete models, and calculating the weight of steel reinforcement and the volume of concrete of each specification according to the precast component part and the cast-in-place composite part respectively.

9. The method according to claim 8, characterized in that, In the step of automatic classification and statistics of the project quantity, the calculation results are divided into four sub-categories: "prefabricated concrete", "precast steel bars", "cast-in-place concrete" and "cast-in-place steel bars" to generate a classification detail table, and the classification detail table supports export and docking with external cost estimation software.

10. The method according to claim 1, characterized in that, The generated 3D solid steel reinforcement information and concrete model are not only used for steel reinforcement collision detection and construction simulation briefing in the BIM environment, but also serve as the digital twin foundation of the prefabricated beam composite structure, realizing data traceability, spatial visualization interaction and cyber-physical mapping throughout the construction life cycle.

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