Multi-camera image acquisition device for building three-dimensional model of bridge structure prefabricated part

Abstract

The utility model discloses a multi-camera image acquisition device for building a three-dimensional model of a bridge structure prefabricated part, which comprises a portal steel frame and a track assembly, and the portal steel frame comprises truss columns respectively positioned on two sides of the bridge structure prefabricated part and a truss beam positioned above the bridge structure prefabricated part. The truss girder is mounted at the tops of the two truss columns; cameras are arranged on the truss columns and the truss girders at intervals to form a camera matrix which is fixed in relative position and is used for acquiring image data of the bridge structure prefabricated parts; the rail assembly comprises sliding rails arranged corresponding to the two truss columns respectively, the sliding rails are parallel to the length direction of the bridge structure prefabricated part, and the truss columns are installed on the corresponding sliding rails in a sliding fit mode. According to the multi-camera image acquisition device for building the three-dimensional model of the prefabricated part of the bridge structure, image data acquired by the cameras can be fused by fixing the position relation between the cameras, so that the three-dimensional model of the prefabricated part of the bridge structure is built.

Description

Technical Field

[0001] This utility model belongs to the field of three-dimensional scanning technology of prefabricated bridge structural components, specifically a multi-camera image acquisition device for establishing three-dimensional models of prefabricated bridge structural components. Background Technology

[0002] Existing technologies for building 3D bridge models primarily rely on two types of information: image information and laser scanning information. Laser scanning technology requires specialized instruments, resulting in high equipment costs; while image-based technologies can utilize cheaper cameras for image acquisition, making them more economical. Current image acquisition methods can be broadly categorized into fixed cameras and drones. Drones are well-suited for image acquisition and 3D scanning of actual engineering structures, but their accuracy is difficult to control due to limitations in flight path planning and clearance requirements with the object being measured. Fixed camera image acquisition is more controllable, but the relative positional relationships between cameras at different locations remain a challenge. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a multi-camera image acquisition device for establishing a three-dimensional model of a prefabricated bridge structure component. By fixing the positional relationship between the cameras, the image data acquired by each camera can be easily fused and processed to construct a three-dimensional model of the prefabricated bridge structure component.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A multi-camera image acquisition device for establishing a three-dimensional model of a precast bridge structure component includes a portal steel frame and a track assembly. The portal steel frame includes truss columns located on both sides of the precast bridge structure component and a truss beam located above the precast bridge structure component. The truss beam is installed on the top of the two truss columns. Cameras are spaced apart on the truss columns and truss beam to form a camera matrix with relatively fixed positions for acquiring image data of the precast bridge structure component.

[0006] The track assembly includes sliding tracks corresponding to the two truss columns respectively. The sliding tracks are parallel to the length direction of the precast bridge structure components, and the truss columns are slidably installed on the corresponding sliding tracks.

[0007] Furthermore, in the camera matrix, the overlap of image data acquired by two adjacent cameras of the prefabricated bridge structure components is greater than or equal to 80%.

[0008] Furthermore, each of the cameras is equipped with a fill light.

[0009] Furthermore, the truss columns and truss beams are assembled using chord members and web members.

[0010] Furthermore, the chord includes a connecting section and a component segment. The connecting section is provided with a connecting tenon for connecting the component segment and the web member, and the connecting tenon is provided with a connecting insertion hole.

[0011] Furthermore, the connecting tenon includes a first tenon for connecting the component segment and a second tenon for connecting the web member.

[0012] Furthermore, the first tenon includes a parallel tenon that is parallel to the length direction of the truss column or truss beam and a vertical tenon that is perpendicular to the length direction of the truss column or truss beam.

[0013] Furthermore, the second tenon is inclined relative to the parallel tenon, and the included angle between the second tenon and the parallel tenon is 30°.

[0014] Furthermore, a tie rod is provided between the connecting tenon and the corresponding component segment or the web member.

[0015] Furthermore, the tenon is provided with a first connecting hole, the axis of which intersects perpendicularly with the axis of the connecting insertion hole; the end of the component segment and the web member is provided with a second connecting hole, the axis of which intersects perpendicularly with the axis of the component segment or the web member to which it is located; the tie rod passes through the first connecting hole and the second connecting hole.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention relates to a multi-camera image acquisition device for establishing a 3D model of a precast bridge structure component. It utilizes a portal steel frame, with truss columns on both sides of the precast bridge structure component and truss beams above it to form a planetary semi-enclosed structure. Cameras are spaced apart on the portal steel frame to form a camera matrix. Due to the constraint of the portal steel frame, the relative positions of the cameras remain fixed during image acquisition, allowing for easy fusion of image data to construct a 3D model of the precast bridge structure component. By setting up a track assembly and mounting the truss columns on a sliding track, the portal steel frame can be driven to move along the sliding track, enabling image acquisition at different positions along the length of the precast bridge structure component. Attached Figure Description

[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0019] Figure 1This is a schematic diagram of the structure of an embodiment of the multi-camera image acquisition device for establishing three-dimensional models of prefabricated bridge structural components according to this utility model;

[0020] Figure 2 This is a structural schematic diagram of truss columns and truss beams;

[0021] Figure 3 This is a schematic diagram of the first type of connecting segment structure;

[0022] Figure 4 This is a schematic diagram of the second type of connecting segment structure.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10-Precast bridge structural components; 20-Truss column; 21-Chord; 22-Web member; 23-Connecting section; 231-Second tenon; 232-Parallel tenon; 233-Vertical tenon; 24-Component segment; 30-Truss beam; 40-Camera; 50-Sliding track. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0026] like Figure 1 As shown, this embodiment of the multi-camera image acquisition device for establishing a 3D model of a precast bridge structure component includes a portal frame and a track assembly. Specifically, the portal frame includes truss columns 20 located on both sides of the precast bridge structure component 10 and a truss beam 30 located above the precast bridge structure component 10. The truss beam 30 is installed on top of the two truss columns 20, thus forming a semi-enclosed structure covering the two sides and top surface of the precast bridge structure component 10. Furthermore, in this embodiment, cameras 40 are spaced apart on the truss columns 20 and the truss beam 30 to form a camera matrix with relatively fixed positions for acquiring image data of the precast bridge structure component 10. Thus, in the camera matrix, the relative positional relationship between any two cameras 40 is kept fixed when acquiring image data of the precast bridge structure component 10.

[0027] In this embodiment, the track assembly includes sliding tracks 50 corresponding to the two truss columns. The sliding tracks 50 are parallel to the length direction of the precast bridge structural member 10, and the truss columns 20 are slidably mounted on the corresponding sliding tracks 50. This allows the portal frame to move along the sliding tracks 50, enabling the acquisition of image data from different locations on the precast bridge structural member 10. In this embodiment, the sliding tracks 50 are guide groove type clamp tracks, allowing the portal frame to move along the length direction of the precast bridge structural member 10, thus enabling photographic capture at different cross-sectional positions of the precast bridge structural member 10. The sliding tracks in this embodiment are equipped with graduated scales for easy control of the movement distance.

[0028] In a preferred embodiment of this example, in order to better fuse image data acquired by different cameras, the spacing between adjacent cameras 40 is constrained. In this example, the spacing between two adjacent cameras 40 in the camera matrix should meet the requirement that the overlap of image data acquired by the prefabricated bridge structure component 10 is greater than or equal to 80%.

[0029] In a preferred embodiment of this example, to overcome the influence of insufficient ambient light, a supplementary light (not shown in the figure) is provided next to each camera 40. In this example, the pixel parameters of the camera 40 should be at least capable of capturing 1080P photos.

[0030] like Figure 2 As shown, in this embodiment, the truss column 20 and truss beam 30 are assembled using chord members 21 and web members 22. Specifically, the chord member 21 includes a connecting section 23 and a component segment 24. The connecting section 23 is provided with a connecting tenon for connecting the component segment 24 and the web member 22. The connecting tenon is provided with a connecting insertion hole. The cross-sectional dimension of the connecting insertion hole is slightly larger than the cross-sectional dimension of the end of the component segment 24 and the web member 22, so that the end of the component segment 24 and the web member 22 can be smoothly inserted into the corresponding connecting insertion hole. In this way, depending on the different structural dimensions of the prefabricated bridge structure component 10, portal steel frames of different sizes can be assembled using the chord members 21 and the web members 22 to meet the requirements for image acquisition of the prefabricated bridge structure component 10.

[0031] In this embodiment, the connecting tenon includes a first tenon for connecting the component segment 24 and a second tenon 231 for connecting the web member 22. Specifically, the first tenon includes a parallel tenon 232 parallel to the length direction of the truss column 20 or truss beam 30 and a vertical tenon 233 perpendicular to the length direction of the truss column 20 or truss beam 30. Specifically, in the connecting segment 23 located in the middle of the chord member 21, there are two parallel tenons 232, which are coaxially arranged, such as... Figure 3As shown. In the connecting section 23 located at the end of the chord 21, there are two vertical tenons 233, which are perpendicular to each other, as shown. Figure 4 As shown, a connecting segment 23 at the top of the truss column 20 has two mutually perpendicular vertical tenons 233. The parallel tenon 232 of this connecting segment 23 is connected to the component segment 24 of the truss column 20, and one of the vertical tenons 233 is connected to the component segment 24 of the truss beam 30. That is, the truss column 20 and the truss beam 30 share a connecting segment 23, achieving the technical purpose of integrally connecting the truss column 20 and the truss beam 30. In this embodiment, the second tenon 231 is inclined relative to the parallel tenon 232, and the included angle between the second tenon 231 and the parallel tenon 232 is 30°.

[0032] In a preferred embodiment of this invention, to improve the connection strength between the connecting tenon and the corresponding component segment 24 and web member 22 and to prevent detachment, a tie rod (not shown in the figure) is provided between the connecting tenon and the corresponding component segment 24 or web member 22. Specifically, for the rod-shaped tie rod, the connecting tenon is provided with a first connecting hole, the axis of which intersects perpendicularly with the axis of the connecting insertion hole; the ends of the component segment 24 and web member 22 are provided with second connecting holes, the axis of which intersects perpendicularly with the axis of the component segment 24 or web member 22 in which they are located; the tie rod passes through the first connecting hole and the second connecting hole.

[0033] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A multi-camera image acquisition device for establishing three-dimensional models of prefabricated bridge structural components, characterized in that: The system includes a portal steel frame and a track assembly. The portal steel frame includes truss columns located on both sides of the precast bridge structure component and a truss beam located above the precast bridge structure component. The truss beam is installed on the top of the two truss columns. Cameras are arranged at intervals on the truss columns and truss beam to form a camera matrix with relatively fixed positions for acquiring image data of the precast bridge structure component. The track assembly includes sliding tracks corresponding to the two truss columns respectively. The sliding tracks are parallel to the length direction of the precast bridge structure components, and the truss columns are slidably installed on the corresponding sliding tracks.

2. The multi-camera image acquisition device for establishing a three-dimensional model of prefabricated bridge structural components according to claim 1, characterized in that: In the camera matrix, the overlap of image data acquired by two adjacent cameras of the prefabricated bridge structure components is greater than or equal to 80%.

3. The multi-camera image acquisition device for establishing a three-dimensional model of prefabricated bridge structural components according to claim 1, characterized in that: Each of the cameras is equipped with a fill light.

4. The multi-camera image acquisition device for establishing a three-dimensional model of prefabricated bridge structural components according to any one of claims 1-3, characterized in that: The truss columns and truss beams are assembled from chord members and web members.

5. The multi-camera image acquisition device for establishing a three-dimensional model of prefabricated bridge structural components according to claim 4, characterized in that: The chord includes a connecting section and a component segment. The connecting section is provided with a connecting tenon for connecting the component segment and the web member. The connecting tenon is provided with a connecting insertion hole.

6. The multi-camera image acquisition device for establishing a three-dimensional model of prefabricated bridge structural components according to claim 5, characterized in that: The connecting tenon includes a first tenon for connecting the component segments and a second tenon for connecting the web members.

7. The multi-camera image acquisition device for establishing a three-dimensional model of prefabricated bridge structural components according to claim 6, characterized in that: The first tenon includes a parallel tenon that is parallel to the length direction of the truss column or truss beam and a vertical tenon that is perpendicular to the length direction of the truss column or truss beam.

8. The multi-camera image acquisition device for establishing a three-dimensional model of prefabricated bridge structural components according to claim 7, characterized in that: The second tenon is inclined relative to the parallel tenon, and the included angle between the second tenon and the parallel tenon is 30°.

9. The multi-camera image acquisition device for establishing a three-dimensional model of prefabricated bridge structural components according to claim 5, characterized in that: A tie rod is provided between the connecting tenon and the corresponding component segment or the web member.

10. The multi-camera image acquisition device for establishing a three-dimensional model of prefabricated bridge structural components according to claim 9, characterized in that: The tenon is provided with a first connecting hole, the axis of which intersects perpendicularly with the axis of the connecting insertion hole; the end of the component segment and the web member is provided with a second connecting hole, the axis of which intersects perpendicularly with the axis of the component segment or the web member to which it is located; the tie rod passes through the first connecting hole and the second connecting hole.

Images