A method for integrating 3D real scene scanning with BIM model

Abstract

The present invention provides a method for integrating application of three-dimensional real-scene scanning and BIM model, which belongs to the technical field of acceptance of engineering construction results, including: selecting a three-dimensional scanning scheme according to the progress of the construction project and the on-site situation; performing on-site three-dimensional scanning according to the three-dimensional scanning scheme to obtain three-dimensional point cloud data; performing BIM modeling while performing three-dimensional scanning, and inspecting and accepting the model; merging the three-dimensional point cloud data and the BIM model in Geomagic Qualify software; fitting and aligning the three-dimensional point cloud data and the BIM model in the Geomagic Qualify software, and performing corresponding settings to obtain comparison data; saving analysis data, and then providing the saved files to the design party and the construction party personnel to guide the design or construction work, or providing corresponding analysis reports according to the specific requirements of the design staff and the construction staff. The present invention can optimize drawings according to the results of the comparison between the three-dimensional scanning and the BIM model, which not only saves costs, but also facilitates the design staff to adjust the drawings in time.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering construction achievement acceptance, and in particular to a method for integrating application of three-dimensional real-scene scanning and BIM model. Background Art

[0002] In engineering construction, the old acceptance method is to conduct manual inspection and review after the three-dimensional point cloud data and BIM model are established. This requires large manpower investment and a long work cycle. In addition, due to the limitations of manual labor, unavoidable omissions and errors will occur, and many detailed problems cannot be discovered, which leads to increased costs for demolition and modification.

[0003] At present, renovation projects are increasing in engineering construction, and the demand for completion information of old buildings is gradually increasing. There are many old buildings. Due to the long time span and personnel turnover, old drawings are lost, or the actual situation of the building does not match the drawings, which makes it difficult to obtain the actual building indicators of the old buildings. Therefore, we need to use 3D scanning technology to reconstruct the architectural parameters, component locations and other information of the old buildings to provide reference for the renovation plan. Through software comparison, the design and construction personnel can understand the real situation of the old buildings in time and optimize the design and construction plans in time. Summary of the invention

[0004] In view of this, the present invention aims to propose a method for the integrated application of 3D real-scene scanning and BIM model, which can optimize drawings and save costs according to the results of comparison between 3D scanning and BIM model. Through comparison, it can be found that the on-site environment is not fully considered in the design of drawings, and the adjustment of on-site construction can be fed back to designers and constructors through the model in time, so as to facilitate designers to adjust drawings in time and constructors to adjust construction plans in time.

[0005] To achieve the above object, the technical solution of the present invention is implemented as follows: a method for integrating 3D real scene scanning with BIM model, comprising the following steps:

[0006] Step 1: Collect existing data and design drawings according to the construction project progress and site conditions, analyze site conditions according to site conditions, and select a suitable 3D scanning solution;

[0007] Step 2: According to the 3D scanning solution selected in step 1, go to the site to conduct 3D scanning and obtain 3D point cloud data;

[0008] Step 3: While carrying out step 2, organize personnel to carry out BIM modeling on the drawings, and check and accept the established BIM model to obtain the correct BIM model;

[0009] Step 4: Import the 3D point cloud data obtained in step 2 and the BIM model established in step 3 into Geomagic Qualify software respectively, and then check whether the 3D point cloud model and BIM model are displayed normally in Geomagic Qualify software and whether the model size is correct;

[0010] Step 5: Fit and align the 3D point cloud data and the BIM model in Geomagic Qualify software. Use the best fit alignment command in Geomagic Qualify software to correctly align the 3D point cloud data and the BIM model in the software, and then make corresponding settings to obtain comparison data.

[0011] Step 6, save the comparison data obtained in step 5, and then provide the saved file to the design party and the construction party for guidance on the design or construction work, or provide corresponding analysis reports according to the specific requirements of the design party and the construction party.

[0012] Further, in step 1, the three-dimensional scanning scheme includes: scanning using a fixed three-dimensional scanner and scanning using a mobile backpack three-dimensional laser scanner;

[0013] When the project building is a multi-story building or the total area of ​​the project is greater than or equal to 3,000 square meters, choose a fixed 3D scanner scanning solution; this solution chooses a fixed 3D scanner for scanning;

[0014] When the project building is single-story and the total project area is less than 3,000 square meters, a mobile backpack 3D laser scanner scanning solution is selected; this solution selects a mobile backpack 3D laser scanner for scanning.

[0015] Furthermore, the scanning operation of the fixed type 3D scanner includes the following steps:

[0016] Preparation: Make sure the software required for the 3D scanner, as well as a stable power supply and network connection are ready. The surface of the object to be scanned should be clean, non-reflective and unobstructed. Select scanning points according to the size of the scanning site and the on-site conditions, record the location of the scanning points and mark them.

[0017] Device connection and startup: Connect the 3D scanner to the computer via USB or network, turn on the scanner and start the scanning software, and ensure that the software and scanner are connected normally;

[0018] Set scanning parameters: Select a suitable scanning mode in the software, scan automatically, and adjust the scanning resolution and speed parameters as needed;

[0019] Start scanning: Fix the scanner at the selected scanning point. After scanning one point, move the scanner to the next scanning point, and continue scanning in sequence until all scanning points are scanned.

[0020] Scanning completion and post-processing: After the scan is completed, the software generates a 3D point cloud model based on the scanned 3D point cloud data, and then previews, adjusts and optimizes the model, adjusts the model size, and finally saves and exports the model.

[0021] Furthermore, the scanning operation of the mobile backpack 3D laser scanner includes the following steps:

[0022] Preparation: Ensure that the scanner can work properly, check the power supply, network and software; plan the scanning route in advance according to the project site conditions;

[0023] Device connection and startup: Connect the 3D scanner to the computer via USB or network, turn on the scanner and start the scanning software, and ensure that the software and scanner are connected normally;

[0024] Start scanning: Fix the scanner on the scanner, check whether it is firmly fixed and whether the scanner works normally, and let the scanner move along the designated scanning route to scan;

[0025] Scanning completion and post-processing: After the scan is completed, the software generates a 3D point cloud model based on the scanned 3D point cloud data, and then previews, adjusts and optimizes the model, adjusts the model size, and finally saves and exports the model.

[0026] Furthermore, when performing three-dimensional scanning, a fixed three-dimensional scanner or a mobile backpack three-dimensional laser scanner is selected; when the project building is a multi-story building or the total area of ​​the project is greater than or equal to 3,000 square meters, a fixed three-dimensional scanner is selected for scanning; when the project building is a single-story building and the total area of ​​the project is less than 3,000 square meters, a mobile backpack three-dimensional laser scanner is selected for scanning.

[0027] Furthermore, in step 3, Revit software is used for BIM modeling, and BIM modeling includes the following steps: collecting drawings, creating files, importing drawings, creating models, reviewing models, and submitting models.

[0028] Furthermore, in step 3, methods for inspecting and accepting the BIM model include: arranging specific personnel to conduct the review, using the model reviewer provided by the Revit software to conduct the review, or conducting the model review through secondary development of a specific review plug-in or software.

[0029] Furthermore, in step 4, the method for merging and importing the models includes:

[0030] Import the established BIM model file into Geomagic Qualify software;

[0031] Then, continue to import the 3D scanning point cloud data file in Geomagic Qualify software;

[0032] Set the BIM model as a reference model;

[0033] Set the 3D scan point cloud as a test model.

[0034] Furthermore, step 5 includes: fitting and aligning the BIM model and the three-dimensional point cloud data, setting parameters for model comparison, and forming comparison data.

[0035] Compared with the prior art, the method for integrating 3D real scene scanning with BIM model described in the present invention has the following advantages:

[0036] (1) The present invention uses the new professional software Geomagic Qualify to compare models, replacing manual comparison; the software comparison is faster, more accurate, and will not miss any results, greatly improving the reliability and comprehensiveness of the comparison results, and saving more costs compared to manual comparison;

[0037] (2) In renovation projects, the method of the present invention can solve the problems of difficulty in obtaining existing building data and difficulty in comparing with renovation plans. The method of the present invention can enable design and construction personnel to timely and accurately understand the existing building conditions, discover problems with the renovation plan, and adjust the plan in a timely manner;

[0038] (3) In new construction projects, the method of the present invention can help construction and building personnel to timely check the construction quality, find construction problems, reduce demolition and modification costs, and improve construction quality;

[0039] (4) Optimize drawings based on the comparison between 3D scanning and BIM models: Through comparison, it is possible to find problems in the design of drawings that do not adequately consider the site environment, and timely feedback the adjustments made to the site construction to the designers through the model, so that the designers can adjust the drawings in a timely manner;

[0040] (5) The method of the present invention can timely discover on-site problems and effectively save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0042] Figure 1A flowchart of a method for integrating 3D real-scene scanning and BIM model application according to an embodiment of the present invention;

[0043] Figure 2 For fixed 3D scanning operations;

[0044] Figure 3 Scanning operation for mobile backpack 3D laser scanner;

[0045] Figure 4 It is 3D scanning point cloud data;

[0046] Figure 5 This is the Geomagic Qualify model comparison interface. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0048] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0049] like Figure 1 As shown, the present invention is a method for integrating the application of three-dimensional real-scene scanning and BIM model, which is mainly used in the implementation of existing building renovation projects and the inspection and acceptance of new building construction. After the old acceptance method establishes the three-dimensional point cloud data and the BIM model, the comparison process is manually checked and reviewed, and there will be unavoidable omissions and errors. In the model comparison stage, the present invention uses the new professional software geomagic qualify to compare the model, replacing the manual method; the software comparison is faster, and the accuracy is high, and there will be no omissions, which greatly improves the reliability and comprehensiveness of the comparison results, and is more cost-effective than manual comparison. In the renovation project, the method described in the present invention can solve the problems of the difficulty in obtaining existing building data and the difficulty in comparing with the renovation plan. The method described in the present invention can enable the design and construction personnel to timely and accurately understand the existing building situation, find problems with the renovation plan, and adjust the plan in time; in the new building project, the method described in the present invention can help the construction and construction personnel to check the construction quality in time, find construction problems, reduce the cost of demolition and modification, and improve the construction quality. Specifically, the method described in the present invention includes the following steps:

[0050] Step 1: Collect existing data and design drawings according to the progress of the construction project and the on-site conditions, ensure that the drawing versions are correct and timely, analyze the on-site conditions according to the on-site conditions, and select a suitable 3D scanning solution; the 3D scanning solution includes: scanning with a fixed 3D scanner and scanning with a mobile backpack 3D laser scanner;

[0051] When the project building is a multi-story building or the total area of ​​the project is greater than or equal to 3,000 square meters, choose a fixed 3D scanner scanning solution; this solution chooses a fixed 3D scanner for scanning;

[0052] When the project building is single-story and the total project area is less than 3,000 square meters, a mobile backpack 3D laser scanner scanning solution is selected; this solution selects a mobile backpack 3D laser scanner for scanning.

[0053] Step 2: According to the 3D scanning solution selected in step 1, go to the site to conduct on-site 3D scanning to obtain 3D point cloud data; see the fixed 3D scanning operation method. Figure 2 .

[0054] The scanning operation of a fixed 3D scanner includes the following steps:

[0055] 1) Preparation: Ensure that the software required for the 3D scanner, as well as a stable power supply and network connection are ready. The surface of the object to be scanned should be clean, non-reflective and unobstructed. Select scanning points according to the size of the scanning site and the on-site conditions, record the location of the scanning points and mark them.

[0056] 2) Equipment connection and startup: Connect the 3D scanner to the computer via USB or network, turn on the scanner power and start the scanning software to ensure that the software and scanner are connected normally;

[0057] 3) Set scanning parameters: Select a suitable scanning mode in the software, scan automatically, and adjust the scanning resolution and speed parameters as needed. High resolution will increase scanning time, but can obtain richer details;

[0058] 4) Start scanning: Fix the scanner at the selected scanning point. After scanning one point, move the scanner to the next scanning point, and continue scanning in sequence until all scanning points are scanned.

[0059] 5) Scanning completion and post-processing: After the scan is completed, the software generates a 3D point cloud model based on the scanned 3D point cloud data, and then previews, adjusts and optimizes the model, repairs surface defects on the model or adjusts the model size, and finally saves and exports the model.

[0060] The operation mode of mobile backpack 3D laser scanner scanning is shown in Figure 3 , including the following steps:

[0061] Preparation: Ensure that the scanner can work properly, check the power supply, network and software; plan the scanning route in advance according to the project site conditions;

[0062] Device connection and startup: Connect the 3D scanner to the computer via USB or network, turn on the scanner and start the scanning software, and ensure that the software and scanner are connected normally;

[0063] Start scanning: Fix the scanner on the scanner, check whether it is firmly fixed and whether the scanner works normally, and let the scanner move along the designated scanning route to scan;

[0064] Scanning completion and post-processing: After the scan is completed, the software generates a 3D point cloud model based on the scanned 3D point cloud data, and then previews, adjusts and optimizes the model, adjusts the model size, and finally saves and exports the model.

[0065] When scanning outdoors, choose a blue light 3D scanner with strong anti-interference ability to reduce the impact of ambient light.

[0066] Avoid placing marking points on arcs, right angles or other easily deformed positions, and ensure that the marking points are reasonably distributed to improve scanning accuracy.

[0067] According to the preferred embodiment of the present invention, since 3D scanning is applied to engineering projects, a fixed 3D scanner or a mobile backpack 3D laser scanner is selected for 3D scanning; when the project building is a multi-story building or the total area of ​​the project is greater than or equal to 3000 m2, a fixed 3D scanner is selected, such as the FARO S350150plus scanner; when the project building is a single-story building and the total area of ​​the project is less than 3000 m2, a mobile backpack 3D laser scanner is selected, such as the scanner OmniSLAM-R6.

[0068] Step 3: While carrying out step 2, organize personnel to carry out BIM modeling on the drawings, and check and accept the established BIM model to obtain the correct BIM model;

[0069] Revit software is used for BIM modeling. BIM modeling includes the following steps: collecting drawings, creating files, importing drawings, building models, reviewing models, and submitting models. The details are as follows:

[0070] 1) Create a new project: Open Revit, select "New Project" and choose the appropriate template;

[0071] 2) Set the project unit: Set the length unit to millimeters through the project unit in the "Manage" tab;

[0072] 3) Draw elevation: In the "Elevation" view, draw the elevation at the appropriate location and adjust the elevation name;

[0073] 4) Import design drawings: import design drawings in dwg format;

[0074] 5) Draw the axis grid: In the "Floor Plan View", use the "Datum" command in the "Architecture" tab to draw and number the axis lines, and mark the dimensions as needed;

[0075] 6) Edit family: Create a new family to be used and select an appropriate family template, such as "Metric Structural Column.rft";

[0076] 7) Model building: build models of various building disciplines (architecture, structure, and electromechanical) based on the imported drawings;

[0077] 8) Set material properties: Select the corresponding material in the family editor and complete the basic parameter settings;

[0078] 9) Save Model: Save the model in the desired format (rvt).

[0079] When checking and accepting the model, the model review requirements are as follows:

[0080] Model component size: The size of the components in the model should be consistent with the design drawings;

[0081] Model component material setting: Model material should be consistent with the design drawing;

[0082] Model component position: The position of the model component should be consistent with the design drawings;

[0083] Elevation setting: The project elevation setting in the model should be consistent with the design drawings;

[0084] Other requirements: The model is mainly used for 3D scanning data comparison. If the model needs to be transferred to other BIM applications for use, the model must be reviewed and modified according to the specific project BIM model review standards.

[0085] The methods for inspecting and accepting BIM models include: arranging specific personnel to review, using the model reviewer provided by the Revit software for review, or conducting model review through secondary development of specific review plug-ins or software; in actual applications, the three review methods have the same usage scenarios and conditions, except that they are more manual or machine-based. According to actual needs, when inspecting and accepting BIM models, you can directly use the manual review method, or use the software plug-in for review and then conduct a manual review.

[0086] Step 4, import the 3D point cloud data obtained in step 2 and the BIM model established in step 3 into Geomagic Qualify software respectively, and then check whether the 3D point cloud model and BIM model are displayed normally in Geomagic Qualify software, whether the model size is correct, the 3D point cloud data is in asc and rcp format, and the BIM model is in rvt (revit) format;

[0087] Geomagic Qual ify is a reverse detection and analysis software developed by Geomagic. Geomagic Qual ify can be used to quickly detect the error between the 3D digital model and the scanned point cloud. Geomagic Qual ify uses intuitive and easy-to-understand graphical comparison results to display the difference between the two. Here it is used to compare and verify the existing building 3D scan point cloud with the BIM model established according to the drawings.

[0088] Methods for merging and importing models include:

[0089] Import the established BIM model file into Geomagic Qualify software;

[0090] Then, continue to import the 3D scanning point cloud data file in Geomagic Qualify software;

[0091] Set the BIM model as a reference model;

[0092] Set the 3D scan point cloud as a test model.

[0093] The specific operations are as follows:

[0094] 1) Open the installed geomagic qualify software;

[0095] 2) After the software is opened, click the "Open" button, find the established BIM model .rvt file, and click "Open";

[0096] 3) Click the "Import" button in the file, and the import file box will appear. Find the 3D scanning point cloud data file and click "Open";

[0097] 4) Right-click the BIM model in the Model Manager and set it as a reference model;

[0098] 5) Right-click the 3D scan point cloud in the Model Manager and set it as a test model.

[0099] Step 5: Fit and align the 3D point cloud data and the BIM model in Geomagic Qualify software. Use the best fit alignment command in Geomagic Qualify software to correctly align the 3D point cloud data and the BIM model in the software, then set parameters for model comparison and obtain comparison data. The specific method is as follows:

[0100] 1) Click Best Fit in the Alignment tab, then click Apply, and finally click OK;

[0101] 2) Click Best Fit in the Alignment tab again, then check Check Symmetry, Fine-tune Only, High Accuracy Fit, Automatically Eliminate Deviation, then click Apply again, and finally click OK;

[0102] 3) Click the "3D Comparison" button in the Analysis tab, click "Apply", then set the maximum nominal value to 0.1, the maximum critical value to 0.15, the color segment to 5, and the upper and lower deviations to ±0.2 respectively;

[0103] 4) Finally, click the OK button, and the detection error will be displayed in color;

[0104] 5) Click the "Create Annotation" button, then select the place to be tested in the graphic box where the error value will appear. Test no less than 10 points as needed, and then click the "OK" button.

[0105] Step 6, save the comparison data obtained in step 5, and then provide the saved file to the design party and the construction party for guidance on the design or construction work, or provide corresponding analysis reports according to the specific requirements of the design party and the construction party.

[0106] The implementers of the present invention need to be proficient in operating Geomagic Qualify and Revit software.

[0107] Taking the Tianjin Xinjiayuan No. 30 Land Project as an example, by using the method of the present invention, a three-dimensional scan is performed, and the three-dimensional scan point cloud data is shown in FIG. Figure 4 As shown in the figure, then, the 3D point cloud data and BIM model are fitted and aligned in Geomagic Qualify software, and corresponding settings are made to obtain comparison data. The comparison effect is shown in Figure 5 By comparing and analyzing the optimized drawings, we found problems on site, saving a total of more than 3 million yuan in project costs. In the basement part, 80 beam errors were found in the drawings, and 52 errors were found in the reserved openings for construction, saving 270,000 yuan in mechanical and electrical dismantling and modification costs.

[0108] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for integrating 3D real scene scanning with BIM model, characterized in that: The following steps are involved: Step 1: Collect existing data and design drawings according to the construction project progress and site conditions, analyze site conditions according to site conditions, and select a suitable 3D scanning solution; Step 2: According to the 3D scanning solution selected in step 1, go to the site to conduct 3D scanning and obtain 3D point cloud data; Step 3: While carrying out step 2, organize personnel to carry out BIM modeling on the drawings, and check and accept the established BIM model to obtain the correct BIM model; Step 4: Import the 3D point cloud data obtained in step 2 and the BIM model established in step 3 into Geomagic Qualify software respectively, and then check whether the 3D point cloud model and BIM model are displayed normally in Geomagic Qualify software and whether the model size is correct; Step 5: Fit and align the 3D point cloud data and the BIM model in Geomagic Qualify software. Use the best fit alignment command in Geomagic Qualify software to correctly align the 3D point cloud data and the BIM model in the software, and then make corresponding settings to obtain comparison data. Step 6, save the comparison data obtained in step 5, and then provide the saved file to the design party and the construction party for guidance on the design or construction work, or provide corresponding analysis reports according to the specific requirements of the design party and the construction party.

2. The method for integrating 3D real scene scanning with BIM model according to claim 1, characterized in that: In step 1, the 3D scanning scheme includes: scanning using a fixed 3D scanner and scanning using a mobile backpack 3D laser scanner; When the project building is a multi-story building or the total area of ​​the project is greater than or equal to 3,000 square meters, choose a fixed 3D scanner scanning solution; this solution chooses a fixed 3D scanner for scanning; When the project building is single-story and the total project area is less than 3,000 square meters, a mobile backpack 3D laser scanner scanning solution is selected; this solution selects a mobile backpack 3D laser scanner for scanning.

3. The method for integrating 3D real scene scanning with BIM model according to claim 2, characterized in that: The scanning operation of a fixed 3D scanner includes the following steps: Preparation: Make sure the software required for the 3D scanner, as well as a stable power supply and network connection are ready. The surface of the object to be scanned should be clean, non-reflective and unobstructed. Select scanning points according to the size of the scanning site and the on-site conditions, record the location of the scanning points and mark them. Device connection and startup: Connect the 3D scanner to the computer via USB or network, turn on the scanner and start the scanning software, and ensure that the software and scanner are connected normally; Set scanning parameters: Select a suitable scanning mode in the software, scan automatically, and adjust the scanning resolution and speed parameters as needed; Start scanning: Fix the scanner at the selected scanning point. After scanning one point, move the scanner to the next scanning point, and continue scanning in sequence until all scanning points are scanned. Scanning completion and post-processing: After the scan is completed, the software generates a 3D point cloud model based on the scanned 3D point cloud data, and then previews, adjusts and optimizes the model, adjusts the model size, and finally saves and exports the model.

4. The method for integrating 3D real scene scanning with BIM model according to claim 2, characterized in that: The scanning operation of the mobile backpack 3D laser scanner includes the following steps: Preparation: Ensure that the scanner can work properly, check the power supply, network and software; plan the scanning route in advance according to the project site conditions; Device connection and startup: Connect the 3D scanner to the computer via USB or network, turn on the scanner and start the scanning software, and ensure that the software and scanner are connected normally; Start scanning: Fix the scanner on the scanner, check whether it is firmly fixed and whether the scanner works normally, and let the scanner move along the designated scanning route to scan; Scanning completion and post-processing: After the scan is completed, the software generates a 3D point cloud model based on the scanned 3D point cloud data, and then previews, adjusts and optimizes the model, adjusts the model size, and finally saves and exports the model.

5. The method for integrating 3D real scene scanning with BIM model according to claim 1, characterized in that: In step 3, Revit software is used for BIM modeling. BIM modeling includes the following steps: collecting drawings, creating files, importing drawings, building models, reviewing models, and submitting models.

6. The method for integrating 3D real scene scanning with BIM model according to claim 1, characterized in that: In step 3, methods for checking and accepting the BIM model include: arranging specific personnel to review, using the model reviewer provided by the Revit software to review, or conducting model review through secondary development of specific review plug-ins or software.

7. The method for integrating 3D real scene scanning with BIM model according to claim 1, characterized in that: In step 4, the method of merging and importing the model includes: Import the established BIM model file into Geomagic Qualify software; Then, continue to import the 3D scanning point cloud data file in Geomagic Qualify software; Set the BIM model as a reference model; Set the 3D scan point cloud as a test model.

8. The method for integrating 3D real scene scanning with BIM model according to claim 1, characterized in that: Step 5 includes: fitting and aligning the BIM model and the three-dimensional point cloud data, setting parameters for model comparison, and forming comparison data.

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