A BIM design method based on CAD

Abstract

The present invention provides a BIM design method based on CAD, comprising the following steps: S1. Converting a two-dimensional drawing CAD1 into a three-dimensional model for design error checking, and then executing step S2 or S3; S2. Repeating step S1 for the modified two-dimensional drawing CAD1; S3. Outputting the two-dimensional drawing CAD2 according to the three-dimensional model. This solution can help designers avoid design errors conveniently and efficiently, thereby improving the design quality and meeting the requirements of construction drawing design. In addition, there is no need for designers to relearn the usage of three-dimensional software, and there is no need to increase the learning cost of designers. While retaining the designer's CAD drawing habits, a three-dimensional model can be obtained for the designer to fully understand the design results.

Description

Technical Field

[0001] The invention belongs to the technical field of architectural design, and in particular relates to a BIM design method based on CAD. Background Art

[0002] At present, architectural engineering design drawings are all two-dimensional drawings based on CAD with multiple design lines drawn separately, but actual engineering projects are all in three-dimensional state. It’s just that two-dimensional architectural design drawings cannot perfectly present the accurate design state, which leads to many design errors that cannot be discovered during the design. If they are discovered after the actual construction, it will cause a lot of rework and waste of resources.

[0003] Based on the above reasons, there is currently a proposal to use 3D BIM software for design. The way to use 3D software for design is for the designer to design in BIM software, and then obtain the final delivery results by drawing the design results in 2D engineering, so as to achieve the purpose of 2D and 3D linkage, so that many design errors can be discovered in 3D state, and design errors can be avoided to a certain extent. However, this method requires designers to be familiar with the use of BIM software. Since most designers use CAD drawing and are familiar with CAD drawing skills and drawing modes, these designers need to re-learn BIM software such as Revit to use BIM software for design, which increases the learning cost of designers. In addition, the output of design results of Revit and other series of BIM software usually cannot meet the requirements of construction drawings. Therefore, most of them are used as auxiliary design software, which cannot achieve the dual improvement of design quality and design efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a CAD-based BIM design method in view of the above problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A CAD-based BIM design method comprises the following steps:

[0007] S1. Convert the two-dimensional drawing CAD1 into a three-dimensional model for design error checking, and then execute step S2 or S3;

[0008] S2. Repeat step S1 for the modified two-dimensional drawing CAD1;

[0009] S3. Output the two-dimensional drawing CAD2 according to the three-dimensional model.

[0010] In the above-mentioned CAD-based BIM design method, in step S1, the design error check is performed manually by the designer and / or automatically by the collaborative platform.

[0011] In the above-mentioned CAD-based BIM design method, in step S1, the collaborative platform automatically checks for design errors through multi-professional collision checks;

[0012] And the multi-professional collision inspection methods include:

[0013] S101. Link various disciplines of the same project together through external link tools;

[0014] S102. When a collision instruction is received, the corresponding two or more professional three-dimensional models are subjected to collision check according to preset rules;

[0015] S103. When a collision is detected between professions, an error prompt is given.

[0016] In the above-mentioned CAD-based BIM design method, in step S1, the two-dimensional drawing CAD1 is drawn by a designer using CAD software on a collaborative platform.

[0017] In the above-mentioned CAD-based BIM design method, in step S1, the designer draws a two-dimensional drawing CAD1 by creating a blank CAD1 file on the collaborative platform, and matches the CAD1 file to the project so that the external link tool can link various disciplines of the same project.

[0018] In the above-mentioned CAD-based BIM design method, the process of the designer drawing the two-dimensional drawing CAD1 on the collaborative platform includes:

[0019] S111. Use the drawing frame function to divide the area by floor, and place positioning points at the same position on each floor;

[0020] S112. Draw CAD single-line content through the tool menu function, and assign component attributes including height and material to the CAD single-line content;

[0021] S113. Set the corresponding items including the number of floors and floor heights through the model function, and match the floor area in step S111 with the floor information;

[0022] S114. Start the step S1 by clicking the browse button.

[0023] In the above-mentioned CAD-based BIM design method, in the multi-discipline collision checking method, when collision occurs between disciplines, the collision components / parts are marked on the model display interface, and a summary list of the collision components / parts is provided.

[0024] In the above-mentioned CAD-based BIM design method, in step S2, the three-dimensional model is converted into a two-dimensional drawing CAD2 by data projection;

[0025] And step S2 specifically includes:

[0026] S21. Get the view type selected by the designer;

[0027] S22. Perform projection calculation on the three-dimensional model according to the multi-faceted projection method;

[0028] S23. Output the two-dimensional drawing CAD2 with corresponding view type for the user to download.

[0029] In the above CAD-based BIM design method, the download method is:

[0030] S3. According to the user's operation, the corresponding two-dimensional drawing CAD2 is downloaded to the user's local file CAD3, and the two-dimensional drawing CAD2 exists in the local file CAD3 as an external reference;

[0031] S4. Combine the two-dimensional information added by the user in CAD3 with the two-dimensional drawing CAD2 of the external reference to form a complete construction drawing and output it.

[0032] In the above-mentioned CAD-based BIM design method, the following methods are also included to ensure the data consistency between the two-dimensional drawing CAD2 and the three-dimensional model:

[0033] S5. When it is detected that the two-dimensional drawing CAD1 has been modified, a three-dimensional model is automatically generated;

[0034] S6. Compare the data consistency of the three-dimensional model generated in step S5 with the two-dimensional drawing CAD2. If they are inconsistent, the two-dimensional drawing CAD2 marked as an external reference in CAD3 is invalidated;

[0035] S5. Replace the old version of the two-dimensional drawing CAD2 with the two-dimensional drawing CAD2 newly downloaded by the user, and delete the invalid mark.

[0036] The advantages of the present invention are:

[0037] 1. Help designers avoid design errors conveniently and efficiently, thereby improving design quality and meeting construction drawing design requirements;

[0038] 2. Designers do not need to relearn how to use 3D software, which does not increase the learning cost of designers. While retaining the CAD drawing habits of designers, they can also obtain 3D models for them to fully understand the design results;

[0039] 3. Allow designers to collaborate in design, discover and optimize design problems in 3D, and then export the optimized 3D model into CAD 2D design drawings that can be used for drawing, which ensures both design quality and design efficiency;

[0040] 4. The 3D models corresponding to different disciplines of the same project can be checked for collision, which can quickly present the collision and conflict points, help designers quickly locate the problem points, improve the efficiency of error checking, and increase the error detection rate, thereby ensuring higher design drawing quality;

[0041] 5. The designer makes two-dimensional drawings, and then projects the required views from the three-dimensional model converted from the two-dimensional drawings, which can output accurate two-dimensional construction drawing design results that meet national standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The overall workflow diagram of the BIM design method based on CAD software of the present invention;

[0043] Figure 2 A method flow chart of a collision check process in a BIM design method based on CAD software of the present invention;

[0044] Figure 3 This is the collision check result page of the present invention Figure 1 ;

[0045] Figure 4 This is the collision check result page of the present invention Figure 2 ;

[0046] Figure 5 This is a flow chart of a method for obtaining a two-dimensional view by cutting and projecting a lightweight three-dimensional model according to the present invention;

[0047] Figure 6 A flow chart of a method for ensuring that a downloaded two-dimensional drawing is consistent with a three-dimensional model provided by the present invention. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] This solution aims at the current situation where designers draw two-dimensional drawings. Since two-dimensional drawings cannot perfectly present the accurate design status, many design errors cannot be discovered during the design process. The method of using BIM software to draw three-dimensional drawings and then output them requires designers to re-learn the three-dimensional software. In addition, the method of using BIM software to draw three-dimensional drawings and then output two-dimensional drawings is prone to the problem of not being able to meet the requirements of construction drawings. This solution proposes a method that does not require designers to re-learn the three-dimensional software and retains the designer's traditional CAD working habits. It allows designers to fully understand the design results in the three-dimensional model state and check for design errors, so that many design errors can be discovered during the design process. Design errors can be exposed and resolved in advance, ensuring the quality of construction drawing design, thereby achieving the goal of less or even zero changes in the later construction process.

[0050] Moreover, since this method does not directly output drawings from three-dimensional drawings, but rather the designer makes two-dimensional drawings, and then projects each required view from the three-dimensional model converted from the two-dimensional drawings, it can ensure that the drawings meet the requirements of the construction drawings. In addition, this method also makes breakthrough use of the correlation between the various disciplines of the same project, and uses the method of colliding two or more disciplines of the same project to automatically check for design errors, thereby improving the efficiency of design error checking and the detection rate of design errors. The same project usually refers to the same building of the same engineering project, and can also directly refer to the same engineering project. The former is preferred in this embodiment. The specific implementation method is as follows:

[0051] like Figure 1 As shown in the figure, this solution provides a BIM design method based on CAD software. Designers convert CAD single lines into lightweight three-dimensional building models by drawing them and defining geometric properties, including:

[0052] S1. The designer logs in to his / her own account on the collaboration platform;

[0053] S2. If there is no corresponding matching project, the designer creates a project on the collaborative platform, then creates a blank CAD1 and matches it to the project. If there is a corresponding matching project, the created CAD1 is directly matched to the corresponding project; that is, the two-dimensional drawing CAD1 drawn by the designer is bound to the project information and building information;

[0054] S3. Then the designer draws the required floor work area in CAD1 through the drawing frame function in the plug-in work panel, that is, divides the area by floor, and places positioning points at the same position on each floor;

[0055] S4. Draw CAD single-line content through the tool menu function of the plug-in operation panel, such as a series of tool menus such as walls, doors, windows, openings, railings, floors, and lofting, and assign component attributes including height and material to the CAD single-line content;

[0056] S5. Set the number of floors, floor heights and other floor information of the corresponding building through the model function of the plug-in operation panel, and then match the floor area in step S3 with the floor information; of course, the order of steps S4 and S5 can be interchanged according to the designer's usage habits.

[0057] S6. Then click the browse button to convert the two-dimensional drawing CAD1 drawn in steps S1-S5 into a lightweight three-dimensional model. The designer can have a comprehensive understanding of his or her design results in the three-dimensional state, which is convenient for the designer to manually check the design errors.

[0058] Preferably, if Figure 2 As shown, the collaborative platform also automatically checks for design errors through multi-disciplinary collision checks:

[0059] S7. The generated 3D model is linked to other disciplines of the same project through an external link tool on the model browsing page. When the designer enters the browsing page of the 3D model, the 3D model is linked to other disciplines of the same project;

[0060] S8. The designer clicks the collision button, and the collaborative platform performs a collision check on two or more professional 3D models according to the preset rules. If there is a collision conflict, an error prompt will be given. For example, a collision label can be added to the collision site. The designer can click the collision label to view the detailed collision results. If there is no collision conflict, it will prompt that this automatic check is correct and record the names of several professional entities involved in the collision.

[0061] Designers can also select several other disciplines of the same project while clicking the collision button, that is, to perform collision checks based on the disciplines selected by the designer, such as Figure 2 The collision check is conducted on both the architectural and structural majors. If there are no problems with the designs of the projects involved in the collision check, then the designs of these projects should be compatible and can be integrated into a non-conflicting architectural model. If there are errors in the design, there will be collision conflicts, such as Figure 3 In the process, there was a collision conflict where the structural beams encroached on the building windows. Figure 4 In the case of collision, there is a collision conflict where the structural ladder column encroaches on the building window. Figure 1 As shown, when a collision conflict occurs, designers of related professions can modify the two-dimensional drawing CAD1 according to the error prompt. After the modification is completed, the modified two-dimensional drawing CAD1 is converted into a three-dimensional model again and a design error check is performed, such as a collision check again.

[0062] Furthermore, the method also includes a review step:

[0063] The reviewer logs in to the collaborative platform, opens a professional 3D model on the model browsing page, directly conducts manual inspection of the 3D model, and circles and comments on the model content through the review function. The reviewer can also use the collision check function to select two or more disciplines for collision check, and then circle and comment on the model content of each discipline based on the collision check results.

[0064] After receiving the comments from the reviewer, the designer modifies the model and submits the revised draft. The collaborative platform will inform the reviewer of the progress of the modification to prompt the reviewer to review. This method can improve the review efficiency and accuracy of the reviewer, greatly reduce the work pressure of the reviewer, and enable one reviewer to efficiently complete the review work that originally required multiple reviewers, thereby achieving the purpose of saving the design company's design cost investment while improving the design company's output quality.

[0065] Specifically, Figure 1 and Figure 5 As shown, in step S8, the three-dimensional model is converted into a two-dimensional drawing CAD2 by means of data projection:

[0066] S81. Get the view type selected by the designer. The designer can use the view management function of the plug-in operation panel in CAD1 to set the geometric coordinates and range, define the parameters such as floors, facades, and sections that need to be projected, and add view types such as plan views, elevation views, and section views by themselves. Then, perform projection operations on the three-dimensional model according to the multi-faceted projection method to obtain projection data. For example, you can quickly select the floor that needs to be cut into a plane according to the floor information set in step S5, and then the collaborative platform can project the plan view at the bottom and top of the projection according to the default cutting height or the cutting height set by the designer; for example, by drawing a cutting line, specifying the cutting position, cutting direction, and cutting style, and then setting the cutting depth, click to activate the projection command to project the section view and elevation view;

[0067] S82. Output the two-dimensional drawing CAD2 with the corresponding view type, and store the projection data in the cloud server of the collaborative platform for users to download.

[0068] S9. This designer or other users can use the view download function in view management to send the user's selected two-dimensional drawing CAD2 to the user's local CAD3 file in the form of an external reference file. The designer can add text annotations, dimension markings and other two-dimensional information required for the construction drawing in CAD3. This information will form a complete set of construction drawings together with the external reference CAD2 and output them.

[0069] Furthermore, if Figure 6 As shown in the figure, the collaborative platform ensures that the content of the CAD2 downloaded by the user for drawing is consistent with the model content through data comparison, so as to achieve the goal of consistent drawing and model:

[0070] S11. Generate a three-dimensional model A by CAD1 drawn in steps S1-S6, project the three-dimensional model A into a two-dimensional drawing CAD2, and download the two-dimensional drawing CAD2 data to the local computer;

[0071] S12. If the collaborative platform detects that the designer has modified CAD1, a new 3D model B is automatically generated;

[0072] S13. Compare the consistency of the 3D model B and CAD2 data. If they are inconsistent, mark the old version of CAD2 as invalid so that it cannot be drawn;

[0073] S14. When the user re-downloads and updates CAD2 to the same version as the 3D model B, the new version CAD2 replaces the old version CAD2 and deletes the invalid mark, so that it can be re-formed with the information in CAD3 to form a complete set of construction drawings and output them.

[0074] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A CAD-based BIM design method, characterized in that: The following steps are involved: S1. Convert the two-dimensional drawing CAD1 into a three-dimensional model for design error checking, and then execute step S2 or S3; S2. Repeat step S1 for the modified two-dimensional drawing CAD1; S3. Convert the three-dimensional model into a two-dimensional drawing CAD2 by means of data projection, and specifically include: S21. Get the view type selected by the designer; S22. Perform projection calculation on the three-dimensional model according to the multi-faceted projection method; S23. Output 2D drawings CAD2 with corresponding view types for users to download; Download method: S3. According to the user's operation, the corresponding two-dimensional drawing CAD2 is downloaded to the user's local file CAD3, and the two-dimensional drawing CAD2 exists in the local file CAD3 as an external reference; S4. The two-dimensional information added by the user in CAD3 and the two-dimensional drawing CAD2 of the external reference are combined to form a complete construction drawing and output; S5. When it is detected that the two-dimensional drawing CAD1 has been modified, a three-dimensional model is automatically generated; S6. Compare the data consistency of the three-dimensional model generated in step S5 with the two-dimensional drawing CAD2. If they are inconsistent, the two-dimensional drawing CAD2 marked as an external reference in CAD3 is invalidated; S7. Replace the old version of the two-dimensional drawing CAD2 with the two-dimensional drawing CAD2 newly downloaded by the user, and delete the invalid mark.

2. The CAD-based BIM design method according to claim 1, characterized in that: In step S1, design errors are checked manually by the designer and / or automatically by the collaborative platform.

3. The CAD-based BIM design method according to claim 2, characterized in that: In step S1, the collaborative platform automatically checks for design errors through multi-professional collision checks; And the multi-professional collision inspection methods include: S101. Link various disciplines of the same project together through external link tools; S102. When a collision instruction is received, the corresponding two or more professional three-dimensional models are subjected to collision check according to preset rules; S103. When a collision is detected between professions, an error prompt is given.

4. The CAD-based BIM design method according to claim 3, characterized in that: In step S1, the two-dimensional drawing CAD1 is drawn by a designer using CAD software on a collaborative platform.

5. The CAD-based BIM design method according to claim 4, characterized in that: In step S1, the designer draws a two-dimensional drawing CAD1 by creating a blank CAD1 file on the collaborative platform, and matches the CAD1 file to the project so that the external link tool can link various disciplines of the same project.

6. The CAD-based BIM design method according to claim 5, characterized in that: The process of designers drawing 2D drawings CAD1 on the collaborative platform includes: S111. Divide the area by floor and place positioning points at the same position on each floor; S112. Draw the CAD single-line content, and assign component attributes including height and material to the CAD single-line content; S113. Set the corresponding items including floor information of the number of floors and floor heights, and match the floor area in step S111 with the floor information.

7. The CAD-based BIM design method according to claim 3, characterized in that: In the multi-discipline collision checking method, when collision occurs between disciplines, the collision components / parts are marked on the model display interface, and a summary list of the collision components / parts is provided.

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