Building lofting system and method based on real-time differential positioning and BIM visualization

Abstract

The invention provides a building lofting system and method based on real-time differential positioning and BIM visualization, and the system comprises a base station which is fixed at a construction site and is used for providing a stable positioning signal; the mobile station is carried on the light high-strength woodworking splint material lofting sample plate and is used for realizing real-time signal receiving and transmission; the lofting sample plate adopting the light high-strength woodworking splint material comprises a sample plate body, a base, a positioning mark and a handle, has a modular design, is convenient to carry and operate, and can flexibly cope with various complex construction environments. The flexibility of lofting is improved through the accurate scales and folding design of the edge of the sample plate, and rapid customization and adjustment of building elements in different shapes are ensured. Through the three-dimensional visualization and automatic lofting process of the BIM software, personal errors are remarkably reduced, and the lofting speed is increased. By using the handheld device or the tablet computer, the mobile display of the BIM model and the interactive display of real-time position information are realized, and the real-time performance and accuracy of lofting are enhanced.

Description

Technical Field

[0001] The present invention relates to the field of building information technology, and in particular to a building layout system and method based on real-time differential positioning and BIM visualization. Background Art

[0002] In the field of civil engineering, especially in large-scale construction projects, accurate lofting is a key link to ensure structural stability and safety. For example, in a 68-meter-diameter cylindrical concrete structure project, a structural column is set every 5 degrees on the inner and outer walls of the cylinder wall, totaling 72. The precise positioning of these structural columns directly affects the accurate connection of the subsequent large-scale steel structure spherical shell grid. Therefore, the millimeter-level accurate lofting of the structural columns is particularly critical.

[0003] Traditional building layout methods mainly rely on ground measurement tools such as total stations and laser surveyors. However, these methods have limitations in complex construction environments:

[0004] Limited tool placement: Installing and operating tools such as total stations can be difficult on a construction site that is small or has obstacles.

[0005] Limited measurement accuracy: Complex terrain and structures may affect the accuracy of traditional measurement methods, making it difficult to meet millimeter-level requirements.

[0006] Inefficiency: The layout process relies on manual operation, which is prone to human errors and is slow.

[0007] In addition, traditional 2D CAD drawings have limitations in expressing complex structures, which increases the difficulty and error risk of lofting work.

[0008] With the development of technology, real-time differential positioning (RTK) technology and building information modeling (BIM) technology have become new ways to solve these problems:

[0009] RTK (Real-Time Kinematic) technology: Real-time dynamic positioning technology, through the differential correction signal transmission between the ground base station and the mobile station, to achieve centimeter-level or even millimeter-level high-precision positioning. This technology can provide stable high-precision positioning in open or complex construction environments.

[0010] BIM (Building Information Modeling) technology: Building Information Modeling technology provides a three-dimensional digital model, integrates design and construction information, helps to intuitively display and understand the project, and guides high-precision construction.

[0011] At present, although RTK and BIM technologies have been widely used in different aspects of the construction industry, how to combine these two technologies to solve the problem of high-precision lofting in complex environments is still a challenge. The limitations of traditional methods have made it urgent to have a new system that can effectively combine RTK and BIM technologies to provide high-precision and high-efficiency solutions for building lofting. Summary of the invention

[0012] In view of the technical problems existing in the prior art, the present invention provides a building layout system and method based on real-time differential positioning and BIM visualization, so as to solve the problems of limited tool placement, measurement accuracy affected by terrain and structural complexity, and low manual operation efficiency of traditional layout methods in narrow or obstacle-filled construction sites.

[0013] According to a first aspect of the present invention, the present invention provides a building layout system based on real-time differential positioning and BIM visualization, comprising:

[0014] The base station fixed at the construction site is used to provide stable positioning signals;

[0015] and multiple mobile stations mounted on the lofted sample board for real-time signal reception and transmission;

[0016] and the lofting sample board made of lightweight and high-strength woodworking plywood material;

[0017] and BIM software for 3D visualization and automated lofting processes;

[0018] and a handheld device or tablet computer for loading and displaying the BIM model and displaying the location information of the mobile station in real time to ensure accurate correspondence with the BIM model.

[0019] Based on the above technical solution, the present invention can also make the following improvements.

[0020] Optionally, the layout template includes a template body, a base, a positioning mark and a handle. The template body is provided with at least two bases, and an RTK mobile station is installed on the base to determine the angle and position of the template.

[0021] Optionally, the template body is divided into a left template and a right template, which are combined into a foldable structure through precision hinges or connectors. A handle is provided on the right template, and space is reserved in the relative position of the left template to avoid the base and handle when in the folded state.

[0022] Optionally, the number of the RTK mobile stations is two and they are respectively fixed on the base of the right template of the layout template.

[0023] Optionally, the edge of the template body is provided with a precise positioning mark, and the positioning mark intersects with the arc line of the outer wall of the cylinder wall to determine the intersection point of the template body and other contour lines.

[0024] Optionally, the BIM software uses Autodesk Revit, Navisworks or Trimble Connect software, supports the import and visualization of real-time differential positioning data, and provides three-dimensional model support for construction.

[0025] According to a second aspect of the present invention, a building lofting method based on real-time differential positioning and BIM visualization is provided, which is used in the above-mentioned building lofting system based on real-time differential positioning and BIM visualization, and the method comprises:

[0026] Step S1. Install the base station at the center of the construction site or at an appropriate location to ensure uniform signal coverage and accurately calibrate the RTK base station;

[0027] Step S2. Use BIM software to build a three-dimensional model of the project, including all construction elements, and calibrate the model coordinate system to be consistent with the site coordinate system to ensure that the model is synchronized with the site;

[0028] Step S3. Fix the RTK mobile station at a known fixed position of the layout template and ensure that the signal connection with the base station is stable, connect the mobile station to the handheld device, and receive and display the real-time positioning data through the software;

[0029] Step S4. Load and calibrate the BIM model on the handheld device, receive the base station signal, transmit it to the handheld device in real time, and move the layout template to the approximate area of ​​the target location according to the information;

[0030] Step S5. Using the real-time position information displayed by the BIM software on the handheld device, fine-tune the layout template to be completely aligned with the BIM model design position;

[0031] Step S6. Use the tool to trace the outer contour of the lofting template, accurately record the data of each lofting point, and ensure that the line is consistent with the BIM model design;

[0032] Step S7. Upload the layout data to the BIM system for comprehensive inspection and cross-verification with the 3D real-life model to ensure the accuracy and consistency of the layout results;

[0033] Step S8. After the layout is completed, an on-site inspection is carried out to ensure that the layout results meet the technical specifications and design requirements, and the deviations found during the layout are adjusted to ensure the construction quality.

[0034] Optionally, also include:

[0035] Step S9. Record the key data and steps in the layout process and prepare a detailed report, including layout result analysis, deviation records and improvement suggestions, to provide reference for project management and subsequent construction.

[0036] Optionally, the three-dimensional model of the project is established using BIM software, including detailed information of all construction elements including the cylindrical concrete structure and structural columns.

[0037] Optionally, the fine-tuning of the lofting template to be completely aligned with the BIM model design position includes:

[0038] Use the dual mobile stations to determine the angle and position of the template, observe the error value, and make adjustments based on the feedback from the BIM software until the template position is completely aligned with the designed position in the BIM model.

[0039] Technical effects and advantages of the present invention:

[0040] The present invention provides a building lofting system and method based on real-time differential positioning and BIM visualization. The system solves the problems of insufficient accuracy and low efficiency in traditional building lofting by integrating high-precision navigation and positioning technology and BIM (Building Information Modeling) technology. The system forms a collaborative lofting solution by integrating high-precision real-time differential positioning technology and BIM technology. High-precision positioning is achieved by RTK technology, combined with the three-dimensional visualization of BIM software, and rapid customization and adjustment are achieved through modularly designed lofting templates to meet the lofting requirements of different building elements. The lofting accuracy and efficiency are significantly improved by reducing human errors and enhancing the level of automation and intelligence. The modular and adaptable design of the system ensures that it can flexibly respond to various complex construction environments and diverse building needs, which is a major advancement in building lofting technology.

[0041] Combined with the lofting method of BIM technology, the present invention realizes the automated process from data preparation to outline drawing and structural column positioning, improving construction efficiency and safety. Real-time monitoring and safety assurance systems ensure the accuracy of operations. Modular design makes the system easy to maintain and upgrade, adapting to changing construction needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of a reference station of a building layout system based on real-time differential positioning and BIM visualization provided by an embodiment of the present invention;

[0043] Figure 2 It is a schematic diagram of a layout template deployment of a building layout system based on real-time differential positioning and BIM visualization provided by an embodiment of the present invention;

[0044] Figure 3It is a schematic diagram of folding a lofting template provided by an embodiment of the present invention;

[0045] Figure 4 It is a schematic diagram of a handheld device of a building layout system based on real-time differential positioning and BIM visualization provided by an embodiment of the present invention;

[0046] Figure 5 It is a schematic diagram of an implementation of a building lofting method based on real-time differential positioning and BIM visualization provided by an embodiment of the present invention;

[0047] Figure 6 It is a schematic diagram of a cylindrical concrete structure provided by an embodiment of the present invention;

[0048] Figure 7 The embodiment of the present invention provides Figure 6 Schematic diagram of the spherical shell grid support at point A. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. 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.

[0050] It is understandable that, based on the defects in the background technology, the embodiment of the present invention proposes a building layout system based on real-time differential positioning and BIM visualization, referring to Figure 1-Figure 4 As shown, including:

[0051] The base station fixed at the construction site is used to provide stable positioning signals;

[0052] The reference station is fixed at a known coordinate point on the construction site and is responsible for transmitting a stable positioning signal to ensure signal coverage and positioning stability in the entire construction area. Figure 1 As shown, the base station is installed on a special surveying tripod so that it can be positioned at the center or appropriate position of the construction site to ensure uniform signal coverage, thereby achieving accurate calibration of the RTK base station.

[0053] and multiple mobile stations mounted on the lofted sample board for real-time signal reception and transmission;

[0054] The mobile station is mounted on the layout template, and multiple high-precision RTK mobile stations can be set to be fixed at fixed positions of the layout template to receive and transmit positioning signals from the reference station in real time. In this example, two high-precision RTK mobile stations are fixed at known fixed positions of the layout template to ensure the accuracy of the angle and position of the template.

[0055] and the lofting sample board made of lightweight and high-strength woodworking plywood material;

[0056] The layout template includes a template body, a base, a positioning mark and a handle. The template body is made of lightweight and high-strength woodworking plywood material, which not only ensures structural stability, but also is easy to carry and operate. At least two bases are provided on the template body, and a mobile station is installed on the base to determine the angle and position of the template. The edge of the template body is provided with a precise positioning mark to determine the intersection of the template body and other contour lines. The positioning mark in this example intersects with the arc line of the outer wall of the cylinder wall. The template body can be divided into a left template and a right template according to needs, and is combined into a foldable structure through precision hinges or connectors, which enhances the flexibility and adaptability of the template. In this example, both bases are set on the right template, and a handle is provided on the right template. Space is reserved for the relative position of the left template so that the base and handle can be avoided when in the folded state. For the outer wall of the cylinder wall, an arc-shaped template is designed as a layout template 2 (not shown), which is also combined into a foldable structure through precision hinges or connectors, further enhancing the flexibility of layout.

[0057] like Figure 2 As shown, the internal rectangle of the layout template is used to determine the contour line of the structural column with high precision. The two mobile stations accurately determine the two-point position of the edge of the structural column, providing key reference for layout. The handle design for easy carrying and operation ensures the portability of the layout template during the layout process. The folding design allows operators to easily unfold the layout template and align the outer contour of the structural column to achieve precise layout, thereby ensuring construction quality.

[0058] like Figure 3 The figure shows the folding diagram of the layout template. The layout template adopts a folding design, which significantly improves the convenience of the layout process. The operator can easily fold the layout template, which not only facilitates the rapid recovery of the template, but also facilitates the transfer between different construction sites. The design of the folding mechanism ensures that the space occupied by the template during transportation and storage is minimized, and it can be quickly unfolded and restored to the working state when needed for precise layout.

[0059] and BIM software for 3D visualization and automated lofting processes;

[0060] The BIM software uses software such as Autodesk Revit, Navisworks or Trimble Connect, supports the import and visualization of real-time differential positioning data, and provides three-dimensional model support for construction.

[0061] and a handheld device or tablet computer for loading and displaying the BIM model and displaying the location information of the mobile station in real time to ensure accurate correspondence with the BIM model.

[0062] like Figure 4 The picture shows a tablet interface that displays a map of the layout project in real time, with local and global view functions. The interface clearly marks the 72 structural columns of the cylindrical concrete structure and displays the location of the layout template near one of the columns. Through the handheld device, the operator can view the BIM model in real time to ensure the accuracy and efficiency of the layout.

[0063] In summary, the building lofting system based on real-time differential positioning and BIM visualization described in the embodiment of the present invention forms a collaborative lofting solution by integrating advanced technologies. High-precision positioning is achieved by using RTK technology, combined with the three-dimensional visualization of BIM software, and rapid customization and adjustment are achieved through modularly designed lofting templates to meet the lofting requirements of different building elements. The lofting accuracy and efficiency are significantly improved by reducing human errors and enhancing the level of automation and intelligence. The modular and adaptable design of the system ensures that it can flexibly respond to various complex construction environments and diverse construction needs, which is a major advancement in building lofting technology.

[0064] The building layout system based on real-time differential positioning and BIM visualization of the present invention can effectively solve the problem of high-precision layout in complex construction environments, improve the layout efficiency and accuracy, and ensure the quality and safety of building construction.

[0065] In addition, the embodiment of the present invention also provides a method for using a building layout system based on real-time differential positioning and BIM visualization, as shown in FIG. Figure 5-Figure 7 As shown, the following steps are included:

[0066] 1. Base station installation

[0067] Install the base station at the center or appropriate location of the construction site to ensure uniform signal coverage and avoid interference from terrain or obstacles. Accurately calibrate the RTK base station to ensure positioning stability and accuracy during the layout process.

[0068] Specifically, select the center or appropriate location of the construction site as the installation point of the base station. This location must ensure that the signal can evenly cover the entire construction area and avoid signal interference caused by terrain or other obstacles. During the installation process, the RTK base station needs to be accurately calibrated to ensure its stability and accuracy, thereby providing a reliable positioning signal source for the entire stakeout process.

[0069] 2. BIM model preparation

[0070] Use professional BIM software (such as Revit) to build a 3D model of the project, including all construction elements. Calibrate the model coordinate system to the site coordinate system to ensure that the model is synchronized with the site and improve the accuracy of the layout.

[0071] Specifically, use professional BIM software, such as Revit, to import and build a 3D model of the project. The model should include all construction elements, such as detailed information on the cylindrical concrete structure and structural columns. Calibrating the coordinate system of the BIM model to ensure that it is consistent with the actual coordinate system of the construction site is a key step to ensure model accuracy and synchronization with the construction site.

[0072] 3. Mobile station installation

[0073] Fix two high-precision RTK mobile stations at known fixed positions of the stakeout template and ensure stable signal connection with the base station. Connect the mobile station to the handheld device, receive and display real-time positioning data through dedicated software, and lay the foundation for stakeout accuracy.

[0074] Specifically, two high-precision RTK mobile stations are fixed at known fixed positions on the stakeout template and ensure that there is a stable and unobstructed signal connection between them and the base station. Connect the mobile station to a handheld device or tablet to receive and display real-time positioning data through dedicated software. This step is the basis for ensuring the accuracy of the stakeout, so all connections and settings need to be carefully checked.

[0075] 4. Initial positioning

[0076] The BIM model is loaded and calibrated on the handheld device, and the base station signal is received and transmitted to the handheld device in real time. The operator moves the layout template to the approximate area of ​​the target location based on the information.

[0077] Specifically, the BIM software is opened on the handheld device and the calibrated BIM model is loaded. Two mobile stations are started to receive signals from the base station and transmit the position information to the handheld device in real time. With this information, the operator can move the layout template to the approximate area of ​​the target location, laying the foundation for the subsequent precise alignment.

[0078] 5. Accurate alignment

[0079] Using the real-time position information displayed by the BIM software on the handheld device, fine-tune the layout template to align it perfectly with the BIM model design position to ensure layout accuracy. Using two mobile stations can more accurately determine the angle and position of the template.

[0080] Specifically, the layout template is fine-tuned through the real-time position information displayed by the BIM software on the handheld device. This step requires the operator to carefully observe the error value and make adjustments based on the feedback from the BIM software until the template position is completely aligned with the designed position in the BIM model. Using two mobile stations can more accurately determine the angle and position of the template.

[0081] 6. Line drawing operation

[0082] Use special tools to trace lines along the outer contour of the layout template, accurately record the data of each layout point, and ensure that the lines are consistent with the BIM model design.

[0083] Specifically, special tools are used to trace the outline of the structural column along the outer contour of the lofting template. This step requires precise and meticulous operation to ensure the accuracy of the line and its consistency with the BIM model design. At the same time, the data of each lofting point is recorded in real time to provide a basis for subsequent inspection and analysis.

[0084] 7. Data recording and verification

[0085] Upload the layout data to the BIM system for comprehensive inspection and cross-verification with the 3D real-life model to ensure the accuracy and consistency of the layout results.

[0086] Specifically, the lofting data is uploaded to the BIM system for comprehensive inspection and verification. Cross-verification is performed through the 3D real-life model to further ensure the accuracy and consistency of the lofting results. This step is an important part of quality control to ensure that all lofting points meet the design requirements.

[0087] 8. Quality Control

[0088] After the layout is completed, conduct on-site inspections and adjust deviations to ensure that the layout results meet technical specifications and design requirements.

[0089] Specifically, after the layout is completed, an on-site inspection is carried out to ensure that the layout results meet the technical specifications and design requirements. Any deviations found during the layout process are adjusted to ensure construction quality.

[0090] 9. Documentation and reporting

[0091] Record key data and steps in the layout process and prepare detailed reports, including layout result analysis, deviation records and improvement suggestions, to provide reference for project management and subsequent construction.

[0092] Specifically, record all key data and steps in the layout process and prepare a detailed layout report. The report should include an analysis of the layout results, a record of any deviations, and subsequent improvement suggestions to provide a reference for project management and subsequent construction.

[0093] like Figure 5 The figure shows a schematic diagram of the implementation of the building lofting method. In this embodiment, the internal rectangle of the lofting template is used to determine the contour line of the structural column with high precision. The two mobile stations accurately determine the two-point position of the edge of the structural column, providing a key reference for the lofting.

[0094] Figure 6This is a schematic diagram of a cylindrical concrete structure. In this cylindrical concrete structure project, in order to ensure uniform support of the structure and optimize mechanical properties, structural columns are set at intervals of 5 degrees on the inner and outer walls of the cylinder. The entire structure has 72 such structural columns, evenly distributed around the cylinder, forming a solid support network.

[0095] Figure 7 yes Figure 6 Schematic diagram of the spherical shell grid support at A. The attached figure shows the design of the spherical shell grid support, which is a key component used to ensure the accurate installation of the large steel structure spherical shell grid in the hemispherical space. The precise alignment of the structural columns and the spherical shell grid supports in the figure is crucial to ensure the stability and integrity of the entire structure. Precise lofting plays a vital role in this process, ensuring that the position and angle of each support are strictly consistent with the design drawings, thereby achieving the smooth installation of the large steel structure and the ultimate stability of the structure.

[0096] In summary, the building layout system and method based on real-time differential positioning and BIM visualization described in the embodiments of the present invention have the following technical effects:

[0097] 1. By integrating high-precision real-time differential positioning technology and BIM technology, the embodiment of the present invention constructs a highly integrated building layout system. This integrated system effectively solves the problems of insufficient precision and low efficiency in traditional layout methods, and significantly improves the accuracy of layout and construction efficiency.

[0098] 2. The base station in the system is fixed at a known coordinate point on the construction site and transmits a stable positioning signal, ensuring the signal quality and positioning stability during the layout process, thereby enhancing the reliability of the layout.

[0099] 3. The layout template is made of lightweight and high-strength woodworking plywood material, and is designed with precise scales and positioning marks on the edges. Combined with high-precision positioning technology and BIM software, these designs ensure the accuracy and consistency of the layout. The modular and foldable design of the layout template further enhances the flexibility and adaptability of the layout.

[0100] 4. The present invention installs two high-precision RTK mobile stations on the layout template to determine the precise position and angle of the template. This innovative design greatly improves the layout accuracy and ensures the reliable application of the template in complex construction environments.

[0101] 5. The application of BIM software supports the import and visualization of real-time differential positioning data, provides three-dimensional model support for construction, simplifies the construction personnel's understanding and operation of the layout process, and reduces the difficulty of operation.

[0102] 6. The use of handheld devices or tablets enables the mobile display of BIM models and the display of real-time location information, ensuring accurate correspondence with the BIM model and improving the real-time and interactivity of layout.

[0103] 7. The present invention reduces human intervention through automated layout process and data recording and verification process, thereby improving layout efficiency and accuracy while ensuring construction quality.

[0104] 8. Prepare a detailed layout report to record all key data and steps in the layout process, which provides an important reference for project management and subsequent construction and enhances the transparency and traceability of the construction.

[0105] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0106] Finally, it should be noted that 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Building layout system based on real-time differential positioning and BIM visualization, characterized by: include: The base station fixed at the construction site is used to provide stable positioning signals; and multiple mobile stations mounted on the lofted sample board for real-time signal reception and transmission; and the lofting sample board made of lightweight and high-strength woodworking plywood material; and BIM software for 3D visualization and automated lofting processes; and a handheld device or tablet computer for loading and displaying the BIM model and displaying the location information of the mobile station in real time to ensure accurate correspondence with the BIM model.

2. The building layout system based on real-time differential positioning and BIM visualization according to claim 1, characterized in that: The layout template includes a template body, a base, a positioning mark and a handle. The template body is provided with at least two bases, and an RTK mobile station is installed on the base to determine the angle and position of the template.

3. The building layout system based on real-time differential positioning and BIM visualization according to claim 2 is characterized in that: The template body is divided into a left template and a right template, which are combined into a foldable structure through precision hinges or connectors. A handle is provided on the right template, and space is reserved in the relative position of the left template to avoid the base and handle when in the folded state.

4. The building layout system based on real-time differential positioning and BIM visualization according to claim 2, characterized in that: The RTK mobile stations are arranged in two numbers and are respectively fixed on the base of the right sample of the layout sample.

5. The building layout system based on real-time differential positioning and BIM visualization according to claim 3 is characterized in that: The edge of the template body is provided with a precise positioning mark, and the positioning mark intersects with the arc line of the outer wall of the cylinder wall, so as to determine the intersection point of the template body and other contour lines.

6. The building layout system based on real-time differential positioning and BIM visualization according to claim 1, characterized in that: The BIM software uses Autodesk Revit, Navisworks or Trimble Connect software, supports the import and visualization of real-time differential positioning data, and provides three-dimensional model support for construction.

7. A building lofting method based on real-time differential positioning and BIM visualization, used in a building lofting system based on real-time differential positioning and BIM visualization as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1. Install the base station at the center of the construction site or at an appropriate location to ensure uniform signal coverage and accurately calibrate the RTK base station; Step S2. Use BIM software to build a three-dimensional model of the project, including all construction elements, and calibrate the model coordinate system to be consistent with the site coordinate system to ensure that the model is synchronized with the site; Step S3. Fix the RTK mobile station at a known fixed position of the layout template and ensure that the signal connection with the base station is stable, connect the mobile station to the handheld device, and receive and display the real-time positioning data through the software; Step S4. Load and calibrate the BIM model on the handheld device, receive the base station signal, transmit it to the handheld device in real time, and move the layout template to the approximate area of ​​the target location according to the information; Step S5. Using the real-time position information displayed by the BIM software on the handheld device, fine-tune the layout template to be completely aligned with the BIM model design position; Step S6. Use the tool to trace the outer contour of the lofting template, accurately record the data of each lofting point, and ensure that the line is consistent with the BIM model design; Step S7. Upload the layout data to the BIM system for comprehensive inspection and cross-verification with the 3D real-life model to ensure the accuracy and consistency of the layout results; Step S8. After the layout is completed, an on-site inspection is carried out to ensure that the layout results meet the technical specifications and design requirements, and the deviations found during the layout are adjusted to ensure the construction quality.

8. The building layout method based on real-time differential positioning and BIM visualization according to claim 7 is characterized in that: Also includes: Step S9. Record the key data and steps in the layout process and prepare a detailed report, including layout result analysis, deviation records and improvement suggestions, to provide reference for project management and subsequent construction.

9. The building layout method based on real-time differential positioning and BIM visualization according to claim 7, characterized in that: The project's three-dimensional model was built using BIM software, which included detailed information on all construction elements including the barrel concrete structure and structural columns.

10. The building layout method based on real-time differential positioning and BIM visualization according to claim 7, characterized in that: The said fine-tuning of the lofting template to fully align with the BIM model design position includes: Use the dual mobile stations to determine the angle and position of the template, observe the error value, and make adjustments based on the feedback from the BIM software until the template position is completely aligned with the designed position in the BIM model.

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