Method for evaluating the processing quality of steel arch ribs in tied arch bridges

Abstract

This invention provides a method for evaluating the processing quality of steel arch ribs in tied-arch bridges. Based on point cloud scanning, this method, after noise reduction, acquires the high-precision dimensional information of the steel arch rib components, forming a point cloud model of the component. This model is then fitted to its design BIM model, and the dimensional and interface errors in the component's processing are compared to assist in the acceptance of the steel arch rib components. This invention, based on point clouds, acquires actual information about the components, providing a basis for the quality acceptance of steel arch rib components in tied-arch bridges and filling a gap in current methods for quality acceptance of arch rib components.

Description

Technical Field

[0001] This invention relates to a method for evaluating the processing quality of steel arch ribs in tied arch bridges. Background Technology

[0002] With the rapid pace of urbanization in my country, the development potential of transportation infrastructure is strong. The development of urban roads and bridges has basically adapted to and strongly supported the rapid development of urban economy and society and the diversified travel needs of citizens.

[0003] Tied arch bridges have become a common type of bridge in Shanghai, used to cross rivers, intersections, obstacles, etc. Their construction technology has gradually shifted from the initial cast-in-place concrete process to the prefabricated steel structure assembly process. However, the current specifications and testing methods cannot meet the quality acceptance requirements of the steel arch rib components of tied arch bridges. Summary of the Invention

[0004] The purpose of this invention is to provide a method for evaluating the processing quality of steel arch ribs in tied arch bridges.

[0005] To address the above problems, this invention provides a method for evaluating the processing quality of steel arch ribs in tied-arch bridges, comprising:

[0006] Step S1: Establish a BIM model of the tied arch bridge;

[0007] Step S2: Set up target registration. Use a scanner to scan the steel arch rib members of the tied arch bridge and the area where the target is located at a fixed angle to collect point cloud data of the members and obtain the point cloud model of the members.

[0008] Step S3: Based on target registration, irrelevant points in the component point cloud data are removed using the point cloud processing software Geomagic Studio. This completes the point cloud model segmentation and noise reduction of a single sub-component in the steel arch rib component of the tied arch bridge, resulting in the point cloud of the segmented and denoised single sub-component. The point clouds of two segmented and denoised sub-components with similar size, scanning resolution of 3.1mm / 10m, and normal scanning quality are selected, and after target sphere registration, the PTS general format data is exported.

[0009] Step S4: Taking the edges of the four sub-components along the length of the steel arch rib of the tied arch bridge as reference, the vertical distance of the edge is cut off on each face. The point cloud of five sub-components on each face is selected for verification. If the verification results are all within the registration error, the point cloud accuracy is determined to meet the requirements; otherwise, return to step S3.

[0010] Step S5: Align the point cloud of the sub-component with the BIM model of the tied arch bridge in Geomagic Qualify software to obtain the point cloud registration accuracy and error results.

[0011] Step S6: After the point clouds of the sub-components are aligned with the BIM model of the tied arch bridge, they are automatically unified to the same coordinate system. The assembly base point is determined according to the actual construction plan. For the steel structure tied arch bridge, the arch seat in the steel arch rib component of the tied arch bridge is used as the assembly base point. After placing the arch seat at the base point, the point clouds of other sub-components in the steel arch rib component of the tied arch bridge are spliced ​​in sequence according to the construction order to obtain each splicing node. The 3D deviation between the point cloud of the sub-components and the BIM model of the tied arch bridge is analyzed.

[0012] Step S7, Component interface assembly analysis: In Geomagic Qualify software, measure the interval values ​​of each splicing node in three directions: bridge orientation, bridge cross section, and vertical direction, to obtain the node analysis results.

[0013] Furthermore, in the above method, step S1, establishing a BIM model of the tied-arch bridge, includes:

[0014] Obtain the detailed design drawings of the arch ribs of the steel structure tied arch bridge and the construction plan of the tied arch bridge. Based on the detailed design drawings of the arch ribs of the steel structure tied arch bridge and the construction plan of the tied arch bridge, establish a BIM model of the tied arch bridge.

[0015] Furthermore, in the above method, step S2 involves setting up target registration. Using a scanner, the steel arch rib members of the tied-arch bridge and the area where the target is located are scanned at a fixed angle to collect point cloud data of the members, thereby obtaining a point cloud model of the members, including:

[0016] The Z+F IMAGER 5010C 3D laser scanner was used as the scanning device. The steel arch rib of the tied arch bridge was placed on the support, and measuring stations were set up around the steel arch rib of the tied arch bridge. Target registration was set up, and the steel arch rib of the tied arch bridge and the area where the target was located were scanned at a fixed angle to collect point cloud data of the component to obtain the point cloud model of the component.

[0017] Furthermore, in the above method, the steel arch rib members of the tied arch bridge are placed above the support.

[0018] The bottom surface of the steel arch rib of the tied arch bridge is 1.5m to 2m above the ground, which facilitates the installation of the scanner.

[0019] Furthermore, in the above method, measuring stations are set up around the steel arch rib members of the tied arch bridge, including:

[0020] One measuring station is set at each end of the steel arch rib of the tied arch bridge. At the middle section of the steel arch rib of the tied arch bridge, measuring stations are set according to the length of the steel arch rib of the tied arch bridge, with two measuring stations set at each end every 15m, and the total number of measuring stations is at least two.

[0021] Furthermore, in the above method, irrelevant points in the component point cloud data include: surrounding environment points and scanning noise points that are unrelated to the stitching.

[0022] Furthermore, in the above method, the point cloud of the sub-components is aligned with the BIM model of the tied-arch bridge in Geomagic Qualify software, including:

[0023] Select the main feature points and feature surfaces in the BIM model of the sub-component and the tied arch bridge for feature alignment, or perform global automatic alignment.

[0024] Furthermore, in the above method, step S5 involves aligning the point clouds of the sub-components with the BIM model of the tied-arch bridge in the Geomagic Qualify software.

[0025] The alignment accuracy requirement is that the point cloud model of the component and the BIM model of the tied arch bridge on the top, bottom, front and back four faces must have an alignment overlap rate of more than 70% for the sub-component point clouds on each face.

[0026] Furthermore, in the above method, after analyzing the deviation between the point cloud of the sub-components and the 3D model of the tied-arch bridge BIM model, the following steps are also included:

[0027] Perform 2D sectioning analysis on key parts of the point cloud of the sub-component.

[0028] Furthermore, in the above method, step S7, component interface assembly analysis: after measuring the interval values ​​of each splicing node in the three directions of bridge alignment, bridge cross section, and vertical direction in Geomagic Qualify software to obtain the node analysis results, it also includes:

[0029] A component evaluation report will be issued, which will include the component's point cloud model, point cloud registration accuracy and error results, component digital pre-assembly analysis results, and node analysis results.

[0030] Compared with existing technologies, this invention, based on point cloud scanning, obtains the external dimensional information of steel arch rib components with high precision after noise reduction, forming a point cloud model of the component. This model is then fitted to its design BIM model to compare the dimensional and interface errors in the component's manufacturing process, thereby assisting in the acceptance of steel arch rib components. This invention, based on point clouds, obtains actual information about the components, providing a basis for the quality acceptance of steel arch rib components in tied arch bridges and filling the gap in current methods for quality acceptance of arch rib components.

[0031] This invention is based on point cloud scanning pre-assembly to evaluate whether the processing of steel arch rib components meets the design and specification requirements. This method can obtain relatively complete digital information of the components before acceptance and has the advantages of high accuracy and fast detection speed. It is especially suitable for most steel structure tied arch bridges.

[0032] This invention provides a method with fast detection speed, low economic cost, and high accuracy for quality assessment of steel arch rib components in steel structure tied arch bridges, and to assist in the acceptance of steel arch rib components. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a scanned component point cloud according to an embodiment of the present invention;

[0034] Figure 2 This is a flowchart of a method for evaluating the processing quality of steel arch ribs in a tied-arch bridge according to an embodiment of the present invention. Detailed Implementation

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 2 As shown, the present invention provides a method for evaluating the processing quality of steel arch ribs in tied-arch bridges, comprising:

[0037] Step S1, Scanning Preparation: Obtain the detailed design drawings of the arch ribs of the steel structure tied arch bridge and the construction plan of the tied arch bridge. Based on the detailed design drawings of the arch ribs of the steel structure tied arch bridge and the construction plan of the tied arch bridge, establish a BIM model of the tied arch bridge to formulate a scanning plan and model comparison standards.

[0038] like Figure 2 As shown, in step S2, scanning the component point cloud: A Z+F IMAGER 5010C 3D laser scanner is used as the scanning device. The steel arch rib component of the tied arch bridge is placed above the support, with the bottom surface of the steel arch rib 1.5m to 2m above the ground to facilitate scanner setup. One measuring station is set at each end of the steel arch rib component. In the middle section of the steel arch rib component, according to the length of the steel arch rib component, two measuring stations are set up every 15m, with a minimum of two or more measuring stations. Target registration is set up, and the steel arch rib component and the area where the target is located are scanned at a fixed angle to collect component point cloud data and obtain the component point cloud model.

[0039] Step S3, Preprocessing point cloud data: Based on target registration, a large number of irrelevant points (including a large number of surrounding environment points, scanning noise points, and other data points unrelated to splicing) are removed from the component point cloud data in the point cloud processing software Geomagic Studio. The point cloud model segmentation and noise reduction of a single sub-component in the steel arch rib component of the tied arch bridge are completed, and the point cloud of the segmented and denoised single sub-component is obtained. Select the point clouds of two segmented and denoised sub-components with similar volume, scanning resolution of 3.1mm / 10m, and normal scanning quality. After registration based on the target sphere, export the PTS general format data.

[0040] Step S4, Point Cloud Data Accuracy Analysis: Taking the edges of the four sub-components along the length of the steel arch rib of the tied arch bridge as reference, the vertical distance of the edge is intercepted on each face, and the point clouds of five sub-components on each face are selected for verification. If the verification results are all within the registration error, the point cloud accuracy is determined to meet the requirements; otherwise, return to step S3: Preprocess the point cloud data.

[0041] Step S5, Aligning the Point Cloud with the Design Model: In Geomagic Qualify software, align the point cloud of the sub-component with the BIM model of the tied arch bridge. Select the main feature points and feature faces in the BIM model of the sub-component and perform feature alignment, or perform global automatic alignment to obtain the point cloud registration accuracy and error results. The alignment accuracy requirement is: the point cloud model of the component must have an alignment overlap rate of more than 70% on each of the four faces (top, bottom, front, and back) of the tied arch bridge BIM model.

[0042] Step S6, Point Cloud Component Simulation Assembly: After the point clouds of the sub-components are aligned with the BIM model of the tied arch bridge, they are automatically unified to the same coordinate system (all components in the design model are spliced ​​in the same coordinate system). The assembly base points are determined according to the actual construction plan. For the steel structure tied arch bridge, the arch seat in the steel arch rib component of the tied arch bridge is used as the assembly base point. After placing the arch seat at the base point, the point clouds of other sub-components in the steel arch rib component of the tied arch bridge are spliced ​​sequentially according to the construction sequence to obtain each splicing node. The 3D deviation between the point clouds of the sub-components and the BIM model of the tied arch bridge is analyzed, and 2D section analysis can be performed on the key parts of the point clouds of the sub-components.

[0043] Step S7, Component interface assembly analysis: In Geomagic Qualify software, measure the interval values ​​of each splicing node in three directions: bridge orientation, bridge cross section, and vertical direction, to obtain the node analysis results;

[0044] Step S8, Component Evaluation Result Report: After the analysis is completed according to the above steps, a component evaluation report is issued. The report includes the component's point cloud model, point cloud registration accuracy and error results, component digital pre-assembly analysis results, and node analysis results.

[0045] This invention, based on point cloud scanning, acquires the external dimensional information of steel arch rib components with high precision after noise reduction, forming a point cloud model of the component. This model is then fitted to its design BIM model to compare the dimensional and interface errors in the component's manufacturing process, thereby assisting in the acceptance of the steel arch rib components. This invention, based on point clouds, obtains the actual information of the components, providing a basis for the quality acceptance of steel arch rib components in tied arch bridges and filling the gap in current methods for quality acceptance of arch rib components.

[0046] This invention is based on point cloud scanning pre-assembly to evaluate whether the processing of steel arch rib components meets the design and specification requirements. This method can obtain relatively complete digital information of the components before acceptance and has the advantages of high accuracy and fast detection speed. It is especially suitable for most steel structure tied arch bridges.

[0047] This invention provides a method with fast detection speed, low economic cost, and high accuracy for quality assessment of steel arch rib components in steel structure tied arch bridges, and to assist in the acceptance of steel arch rib components.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0049] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0050] Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A method for evaluating the processing quality of steel arch ribs in tied-arch bridges, characterized in that, include: Step S1: Establish a BIM model of the tied arch bridge; Step S2: Set up target registration. Use a scanner to scan the steel arch rib members of the tied arch bridge and the area where the target is located at a fixed angle to collect point cloud data of the members and obtain the point cloud model of the members. Step S3: Based on target registration, irrelevant points in the component point cloud data are removed using the point cloud processing software Geomagic Studio. This completes the point cloud model segmentation and noise reduction of a single sub-component in the steel arch rib component of the tied arch bridge, resulting in the point cloud of the segmented and denoised single sub-component. The point clouds of two segmented and denoised sub-components with similar size, scanning resolution of 3.1mm / 10m, and normal scanning quality are selected, and after target sphere registration, the PTS general format data is exported. Step S4: Taking the edges of the four sub-components along the length of the steel arch rib of the tied arch bridge as reference, the vertical distance of the edge is cut off on each face. The point cloud of five sub-components on each face is selected for verification. If the verification results are all within the registration error, the point cloud accuracy is determined to meet the requirements; otherwise, return to step S3. Step S5: Align the point cloud of the sub-component with the BIM model of the tied arch bridge in Geomagic Qualify software to obtain the point cloud registration accuracy and error results. Step S6: After the point clouds of the sub-components are aligned with the BIM model of the tied arch bridge, they are automatically unified to the same coordinate system. The assembly base point is determined according to the actual construction plan. For the steel structure tied arch bridge, the arch seat in the steel arch rib component of the tied arch bridge is used as the assembly base point. After placing the arch seat at the base point, the point clouds of other sub-components in the steel arch rib component of the tied arch bridge are spliced ​​in sequence according to the construction order to obtain each splicing node. The 3D deviation between the point cloud of the sub-components and the BIM model of the tied arch bridge is analyzed. Step S7, Component interface assembly analysis: In Geomagic Qualify software, measure the interval values ​​of each splicing node in three directions: bridge orientation, bridge cross section, and vertical direction, to obtain the node analysis results; Step S2: Set up target registration. Using a scanner, scan the steel arch rib members of the tied arch bridge and the area where the target is located at a fixed angle to collect point cloud data of the members, so as to obtain the point cloud model of the members, including: The Z+F IMAGER 5010C 3D laser scanner was used as the scanning device. The steel arch rib of the tied arch bridge was placed on the support, and measuring stations were set up around the steel arch rib of the tied arch bridge. Target registration was set up, and the steel arch rib of the tied arch bridge and the area where the target was located were scanned at a fixed angle to collect point cloud data of the component to obtain the point cloud model of the component.

2. The method for evaluating the processing quality of steel arch ribs in tied-arch bridges as described in claim 1, characterized in that, Step S1, establish the BIM model of the tied arch bridge, including: Obtain the detailed design drawings of the arch ribs of the steel structure tied arch bridge and the construction plan of the tied arch bridge. Based on the detailed design drawings of the arch ribs of the steel structure tied arch bridge and the construction plan of the tied arch bridge, establish a BIM model of the tied arch bridge.

3. The method for evaluating the processing quality of steel arch ribs in tied-arch bridges as described in claim 1, characterized in that, The steel arch ribs of the tied arch bridge are placed above the support. The bottom surface of the steel arch rib of the tied arch bridge is 1.5m to 2m above the ground, which facilitates the installation of the scanner.

4. The method for evaluating the processing quality of steel arch ribs in tied-arch bridges as described in claim 1, characterized in that, Measuring stations are set up around the steel arch rib members of the tied arch bridge, including: One measuring station is set at each end of the steel arch rib of the tied arch bridge. At the middle section of the steel arch rib of the tied arch bridge, measuring stations are set according to the length of the steel arch rib of the tied arch bridge, with two measuring stations set every 15m, and the number of measuring stations is at least two or more.

5. The method for evaluating the processing quality of steel arch ribs in tied-arch bridges as described in claim 1, characterized in that, Irrelevant points in component point cloud data include: surrounding environment points unrelated to the stitching and scan noise.

6. The method for evaluating the processing quality of steel arch ribs in tied-arch bridges as described in claim 1, characterized in that, Aligning the point clouds of sub-components with the BIM model of the tied-arch bridge in GeomagicQualify software includes: Select the main feature points and feature surfaces in the BIM model of the sub-component and the tied arch bridge for feature alignment, or perform global automatic alignment.

7. The method for evaluating the processing quality of steel arch ribs in tied-arch bridges as described in claim 1, characterized in that, Step S5: Aligning the point clouds of the sub-components with the BIM model of the tied-arch bridge in Geomagic Qualify software. The alignment accuracy requirement is that the point cloud model of the component and the BIM model of the tied arch bridge on the top, bottom, front and back four faces must have an alignment overlap rate of more than 70% for the sub-component point clouds on each face.

8. The method for evaluating the processing quality of steel arch ribs in tied-arch bridges as described in claim 1, characterized in that, After analyzing the discrepancies between the point cloud of the sub-components and the 3D model of the tied-arch bridge BIM model, the following steps are also included: Perform 2D sectioning analysis on key parts of the point cloud of the sub-component.

9. The method for evaluating the processing quality of steel arch ribs in tied-arch bridges as described in claim 1, characterized in that, Step S7, Component Interface Assembly Analysis: After measuring the interval values ​​of each splicing node in the three directions of bridge alignment, bridge cross section, and vertical direction in Geomagic Qualify software to obtain the node analysis results, the following steps are also included: A component evaluation report will be issued, which will include the component's point cloud model, point cloud registration accuracy and error results, component digital pre-assembly analysis results, and node analysis results.

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