BIM (Building Information Modeling)-based road marking rapid and accurate modeling method

Abstract

The invention discloses a BIM-based road marking rapid and accurate modeling method, and relates to the technical field of road modeling. According to the method, firstly, a road CAD drawing is preprocessed, and a road marking CAD drawing, a road marking contour CAD drawing and a road longitudinal slope line CAD drawing are extracted; and then a road longitudinal slope surface model is established based on the road longitudinal slope line, and the road longitudinal slope surface model is sheared to obtain a road model. And then generating a plane model according to the road marking CAD drawing, mapping the plane model to the road longitudinal slope model through calculation of projection points to obtain a marking model, and finally coupling the marking model with the road model. According to the method, the problems of low efficiency and poor precision caused by manual adjustment of traditional marking modeling are solved through the BIM technology, full-process automatic rapid modeling of the road marking is realized, and the design precision and the construction efficiency are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of road modeling, and in particular to a method for quickly and accurately modeling road markings based on BIM. Background Art

[0002] The traditional method of drawing a plane model requires rotating or translating the horizontal model of the marking according to the slope angle of the road to fit the road. Although this method is simple to operate, the mileage of the actual road is often very long, and the slope changes will naturally be very many, so the workload required for adjustment is very large. If the traditional method of drawing markings is used, it will not only be inefficient and time-consuming, but also there is a possibility of drawing errors. The Chinese patent application with publication number CN109518620A discloses a column-type road traffic marking projection device, which determines the matching degree by calculating the elevation difference between the roadside marking and the road surface, and automatically monitors the marking fit through an algorithm to avoid traditional manual adjustment. However, the device can only detect whether the marking matches the road, and cannot directly generate a plane model that fits the slope. Therefore, it is necessary to propose a method for quickly and accurately modeling road markings. Summary of the Invention

[0003] In order to solve the defects of the above-mentioned prior art, the present invention proposes a BIM-based fast and accurate modeling method for road markings, which directly processes the changes in slope and curvature through three-dimensional projection to generate a plane model consistent with the road slope.

[0004] The invention objectives of this application can be achieved through the following technical solutions: A BIM-based road marking rapid and accurate modeling method includes the following steps: Step 1: Preprocessing of road CAD drawings; Step 2: Establish road BIM model; Step 3: Pre-generation of plane model; Step 4: Generate a marking model based on the plane model; Step 5: Coupling the road marking model with the road model.

[0005] In the present invention, in step 1, the road CAD drawing is extracted to obtain a road marking CAD drawing, a road contour CAD drawing, and a road longitudinal slope line CAD drawing.

[0006] In the present invention, in step 2, a road longitudinal slope surface model is drawn according to the road longitudinal slope line CAD drawing, a hollow model of the road shape is created according to the road profile CAD drawing, and the road longitudinal slope surface model is sheared to obtain a road model.

[0007] In the present invention, in step 3, a plane model of the road marking is obtained according to the road marking CAD drawing.

[0008] In the present invention, in step 4, the coordinate points of the obtained plane model are calculated by simultaneous equations to obtain multiple projection points, and the projection points are connected in sequence to obtain a marking line model.

[0009] The present invention provides a rapid and accurate BIM-based road marking modeling method with the following beneficial effects: First, the method processes a road CAD drawing to construct a three-dimensional road model as a carrier for the markings, while also pre-generating a planar model of the markings. Then, an algorithm processes the planar model to calculate its projection coordinates on the three-dimensional road model, thereby quickly and accurately generating a projected model of the markings that conforms to the road surface. Finally, the projected model of the markings is precisely coupled to the road surface model. This method enables the rapid and accurate drawing of a planar road model. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a flow chart of the method for rapid and accurate modeling of road markings based on BIM of the present invention; Figure 2 A schematic diagram of a road CAD drawing of the present invention; Figure 3 A schematic diagram of a road profile CAD drawing of the present invention; Figure 4 A schematic diagram of a road marking CAD drawing of the present invention; Figure 5 A schematic diagram of a CAD drawing of a road longitudinal slope line according to the present invention; Figure 6 Schematic diagram of the road longitudinal slope model of the present invention; Figure 7 Schematic diagram of the hollow model of the present invention; Figure 8 is a schematic diagram of a road model of the present invention; Figure 9 is a schematic diagram of a plane model of the present invention; Figure 10 Schematic diagram of the projection point of the present invention. DETAILED DESCRIPTION

[0011] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0012] In the field of road marking design, traditional methods typically use two-dimensional flat surface models, which are manually adjusted to match the three-dimensional road surface. This model has obvious limitations: when faced with complex and changing road slopes, engineers need to repeatedly perform operations such as rotation and translation, which is not only time-consuming but also difficult to ensure accuracy. The inefficiency and error rate of traditional methods are particularly prominent on mountain roads or at intersections. This invention uses digital modeling and intelligent algorithms to achieve automatic adaptation of marking designs to road surfaces, fundamentally changing the traditional manual adjustment operation mode.

[0013] Reference Figure 1 The BIM-based road marking rapid and accurate modeling method of the present invention described in detail in this embodiment includes the following steps: Step 1: Pre-process the road CAD drawings. Figures 2 to 5 , extract the information needed in the road CAD drawing in AutoCAD, and obtain the road marking CAD drawing, road contour CAD drawing, and road longitudinal slope line CAD drawing.

[0014] Step 2: Create a road BIM model. Figures 6 to 8 In a new regular family file in Revit, open the left / right elevation view, insert the road longitudinal slope line CAD drawing, and draw the road longitudinal slope surface model. Then open the top view, insert the road outline CAD drawing, create a hollow model of the road shape, and cut the road longitudinal slope surface model to obtain the actual road model.

[0015] Step 3: Pre-generate the plane model. Pre-generate the plane model of the road marking. Figure 9 , insert the road marking CAD drawing into the newly created regular family file in Revit software, and draw the plane model of the road marking.

[0016] Step 4: Generate a marking model based on the plane model.

[0017] Define the longitudinal slope surface. The longitudinal slope surface of the road marking CAD drawing is a parallelogram ABCD. The parallelogram ABCD consists of vertices A(x A ,y A ,z A )、B (x B ,y B ,z B )、C (x C ,y C ,z C ) and D(x D ,y D ,z D ) definition, and satisfies AB / / CD, AD / / BC.

[0018] Construct the plane equation of the parallelogram. Obtain the plane vectors based on vertices A, B, and C. and plane vector , through the plane vector and The cross product of ,in, , , , then the plane equation of parallelogram ABCD is ax+by+cz+d=0, d=-(ax A +by A +cz A ).

[0019] Solve for the projection point. Figure 10 , extract the two coordinate points P1(x1,y1,z1) and P2(x2,y2,z2) that realize the plane model. Project them vertically onto the parallelogram ABCD to obtain the projection points P'1(x'1,y'1,z'1) and P'2(x'2,y'2,z'2). The projection points P'1 and P'2 satisfy the equation , solving the above equations yields projection points P'1 and P'2. Similarly, the projection points of other coordinate points can be obtained using this algorithm. Simply read the coordinate points of the original road marking plane model and quickly calculate each projection point using simultaneous equations. Connecting these projection points sequentially yields a road-fitting marking model.

[0020] Step 5: Coupling the road marking model with the road model: Directly couple the road model with the processed road marking model to obtain the final road marking model.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A BIM-based road marking rapid and accurate modeling method, characterized by: The following steps are involved: Step 1: Preprocessing of road CAD drawings; Step 2: Establish road BIM model; Step 3: Pre-generation of plane model; Step 4: Generate a marking model based on the plane model; Step 5: Coupling the road marking model with the road model.

2. The BIM-based road marking rapid and accurate modeling method according to claim 1 is characterized in that: In step 1, the road CAD drawing is extracted to obtain the road marking CAD drawing, the road profile CAD drawing, and the road longitudinal slope line CAD drawing.

3. The BIM-based road marking rapid and accurate modeling method according to claim 2 is characterized in that: In step 2, a road longitudinal slope surface model is drawn according to the road longitudinal slope line CAD drawing, a hollow model of the road shape is created according to the road outline CAD drawing, and the road longitudinal slope surface model is cut to obtain a road model.

4. The BIM-based road marking rapid and accurate modeling method according to claim 2 is characterized in that: In step 3, a plane model of the road marking is obtained according to the road marking CAD drawing.

5. The BIM-based road marking rapid and accurate modeling method according to claim 4 is characterized in that: In step 4, the coordinate points of the obtained plane model are calculated by simultaneous equations to obtain multiple projection points, and the projection points are connected in sequence to obtain the marking line model.

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