A steel box arch rib quality monitoring method and system based on BIM and 3D laser scanning

Abstract

The present invention discloses a method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning, comprising the following steps: constructing a first BIM three-dimensional model based on the drawings and parameter information of each pre-assembled arch rib component; scanning each pre-assembled arch rib component to construct a first point cloud model; performing a primary fitting between the first BIM three-dimensional model and the first point cloud model to determine whether the quality of the pre-assembled arch rib component meets the quality standards; performing spatial operations on the first BIM three-dimensional model of each pre-assembled arch rib component to obtain a second BIM three-dimensional model of the arch rib segment; scanning the actually assembled arch rib segment to obtain a second point cloud model of the arch rib segment; performing a secondary fitting between the second point cloud model and the second BIM three-dimensional model, and comparing the coordinate deviation of the arch rib segment in real time to monitor the deviation of the arch rib segment. The present invention solves the problems of low precision control and difficulty in information-based quality control of the pre-assembled arch rib components and the arch ribs formed after assembly in existing steel box tied arch bridges.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to a method and system for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning. Background Art

[0002] With the rapid development of my country's transportation industry, bridges are becoming increasingly important within the industry. Arch bridges, with their aesthetically pleasing shape and rational structure, play an irreplaceable role in bridge construction. Steel-box tied-arch bridges, with their unique load-bearing structure, significantly reduce their weight while still meeting load-bearing capacity, resulting in a graceful, simple, and aesthetically pleasing overall shape. They are widely used in bridge construction worldwide. However, due to their structural complexity, steel-box tied-arch bridges are often prefabricated and assembled in sections during construction. Therefore, the accuracy of the splicing during construction determines whether the arch ribs are stressed. Traditional detection techniques, due to data limitations, cannot effectively reflect errors and are time-consuming and labor-intensive. Therefore, the research of new measurement technologies is urgent.

[0003] Patent application number CN201910554678.7 discloses a BIM-based arch rib fabrication and construction method. The method involves drawing a plan view of the entire arch rib and dividing it into multiple unit segments. The 3D modeling step involves drawing BIM 3D models of the multiple unit segments and determining the arch rib model based on these 3D models. A jig drawing step involves segmenting the arch rib model, drawing a jig model, and assembling it onto the arch rib model to determine the arch rib construction model. A collision detection step involves performing BIM collision detection on the assembled arch rib construction model and adjusting the design based on the collision data. A material accounting step involves producing a jig processing drawing and generating a bill of materials using BIM technology. This method fails to achieve precision control during the splicing of the arch rib units, nor does it enable information-based quality control of the arch ribs. Research on the application of BIM technology in bridge construction management by domestic and international scholars has primarily focused on visual modeling, data sharing, and management frameworks. Most research remains theoretical, with few studies validating the theories or findings through actual bridge construction projects. Consequently, the application of BIM technology in bridge engineering remains incomplete and in-depth. At the same time, BIM technology is integrating with cloud computing, VR, the Internet, big data, AI and other high-tech information technologies. Technological compatibility has become a development trend of information technology, and the scope of BIM technology is constantly expanding. To this end, based on the actual project of steel box tied arch bridge, with the support of BIM technology and 3D laser scanning technology, we try to realize the virtual inspection of arch rib steel component processing and production and the information management of virtual splicing quality, so as to solve the difficulties of traditional monitoring mentioned above. Summary of the Invention

[0004] The main purpose of the present invention is to provide a steel box arch rib quality monitoring method and system based on BIM and 3D laser scanning, aiming to solve the problems of low precision control of each arch rib pre-assembled component and the complete arch rib formed after splicing each arch rib pre-assembled component in existing steel box tied arch bridges, as well as the difficulty in information management and control of the quality of each arch rib pre-assembled component and the quality of each arch rib pre-assembled component after splicing.

[0005] To achieve the above objectives, the present invention provides a method and system for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning, wherein the method comprises the following steps:

[0006] S1. Constructing a first BIM three-dimensional model of each arch rib pre-assembled component according to the drawing information and parameter information of each arch rib pre-assembled component;

[0007] S2. Perform 3D laser scanning on each pre-assembled arch rib component to construct a first point cloud model of each pre-assembled arch rib component;

[0008] S3, fitting the first BIM three-dimensional model of each arch rib pre-assembled component with the first point cloud model, and determining whether the quality of the arch rib pre-assembled component meets the standard;

[0009] S4. Performing spatial operations on the first BIM three-dimensional model of each pre-assembled arch rib component to obtain a second BIM three-dimensional model of the arch rib segment;

[0010] S5. Confirm the location of the on-site measurement station, install and weld the pre-assembled arch rib components, and perform 3D laser scanning on the assembled arch rib segments to obtain a second point cloud model of the arch rib segments;

[0011] S6. Performing a quadratic fit on the second point cloud model of the arch rib segment and the second BIM three-dimensional model, and comparing the coordinate deviation of the arch rib segment in real time to monitor the deviation of the arch rib segment.

[0012] In one preferred embodiment, step S3 specifically includes the following steps:

[0013] S31, fitting the first BIM three-dimensional model of each pre-assembled arch rib component with the first point cloud model to obtain the three-dimensional coordinates of each corresponding point on the surface of the first BIM three-dimensional model and the first point cloud model respectively;

[0014] S32: Obtain three-dimensional coordinate differences between corresponding points on the surfaces of the first BIM three-dimensional model and the first point cloud model according to the three-dimensional coordinates of corresponding points on the surfaces of the first BIM three-dimensional model and the first point cloud model;

[0015] S33. Determine whether the quality of the arch rib pre-assembled component meets the standard based on the three-dimensional coordinate difference; if the three-dimensional coordinate difference is less than a first standard value, determine that the quality of the arch rib pre-assembled component meets the standard; otherwise, re-correct the arch rib pre-assembled component.

[0016] In one preferred solution, after the step of determining whether the quality of the pre-assembled arch rib components meets the standards, the method further comprises:

[0017] The first BIM three-dimensional model of the arch rib pre-assembly component is updated according to the data of each corresponding point in the first point cloud model of the arch rib pre-assembly component.

[0018] In one of the preferred solutions, the three-dimensional coordinate difference is a manufacturing error of the arch rib pre-assembled component.

[0019] In one of the preferred solutions, the spatial operation on the first BIM three-dimensional model of each arch rib pre-assembly component in step S4 is specifically to sequentially implement the pre-assembly between each arch rib pre-assembly component.

[0020] One of the preferred solutions, before the step of performing secondary fitting on the second point cloud model of the arch rib segment and the second BIM three-dimensional model, includes:

[0021] A plurality of control points are set on the second point cloud model of the arch rib segment.

[0022] In one preferred embodiment, step S6 specifically includes the following steps:

[0023] S61, performing a secondary fitting on the second point cloud model of the arch rib segment and the second BIM three-dimensional model, and fitting the second point cloud model of the arch rib segment and the arch rib axis of the second BIM three-dimensional model by identifying each control point;

[0024] S62, determining whether the linear shape of the arch rib segment deviates by comparing in real time the coordinate deviations between each control point in the second point cloud model and the coordinate points corresponding to each control point in the second BIM three-dimensional model;

[0025] S63: If the coordinate deviation is less than the second standard value, it is determined that the linear shape of the arch rib segment has not deviated, and the second BIM three-dimensional model of the arch rib segment is updated in real time according to the data of each control point in the second point cloud model of the arch rib segment, and the coordinate data of the next arch rib segment is derived;

[0026] S64: If the coordinate deviation is greater than the second standard value, it is determined that the linear shape of the arch rib segment has deviated, and the linear shape of the arch rib segment is corrected according to the coordinate deviation.

[0027] One of the preferred solutions, after step S6, includes:

[0028] The deviation accuracy of the assembled arch rib segments is verified.

[0029] In one preferred embodiment, the first standard value and the second standard value are both 2 mm.

[0030] The present invention provides a method and system for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning, wherein the system includes: a storage unit and a processing unit, wherein the storage unit stores a computer program that can be run on the processing unit; when the processing unit executes the computer program, the method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning is implemented.

[0031] In the above technical solution of the present invention, the steel box arch rib quality monitoring method based on BIM and 3D laser scanning includes the following steps: constructing a first BIM three-dimensional model of each arch rib pre-assembled component according to the drawing information and parameter information of each arch rib pre-assembled component; performing 3D laser scanning on each arch rib pre-assembled component to construct a first point cloud model of each arch rib pre-assembled component; fitting the first BIM three-dimensional model of each arch rib pre-assembled component with the first point cloud model, and judging whether the quality of the arch rib pre-assembled component meets the standard; performing spatial operation on the first BIM three-dimensional model of each arch rib pre-assembled component to obtain a second BIM three-dimensional model of the arch rib segment; confirming the position of the on-site measuring station, installing and welding between each arch rib pre-assembled component, and performing 3D laser scanning on the assembled arch rib segment to obtain a second point cloud model of the arch rib segment; performing secondary fitting on the second point cloud model of the arch rib segment with the second BIM three-dimensional model, and comparing the coordinate deviation of the arch rib segment in real time to monitor the deviation of the arch rib segment. The invention solves the technical problem of low precision of the arch rib pre-assembled components and the complete arch rib formed after the pre-assembled arch rib components are assembled during the construction process of the existing steel box tied arch bridge.

[0032] In the present invention, by combining BIM technology with 3D laser scanning technology, a BIM three-dimensional model and a point cloud model of the steel box arch rib are established, and all kinds of information data of the arch rib are received in an all-round way, thereby realizing the information management and control of the quality of each arch rib pre-assembled component and each arch rib pre-assembled component after splicing, and monitoring the arch rib quality and correcting the arch rib line shape, thereby reducing the construction difficulty as well as the manpower and time costs in the pre-assembly process; at the same time, construction and testing are carried out through the various data provided, thereby further improving the project quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0034] Figure 1 This is a flow chart of a method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of step S3 of a method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning according to an embodiment of the present invention;

[0036] Figure 3 Schematic diagram of step S6 of a method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning according to an embodiment of the present invention;

[0037] Figure 4 This is a rendering of a steel box tied arch bridge;

[0038] Figure 5(a) is a front view of the steel box tied arch bridge;

[0039] Figure 5(b) is a top view of the steel box tied arch bridge;

[0040] Figure 6 Schematic diagram of quality inspection of GGL-2 arch rib pre-assembled components according to an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of the distribution of inspection points of the GGL-2 arch rib pre-assembled component according to an embodiment of the present invention;

[0042] Figure 8 Schematic diagram of comparative analysis of reference and measured coordinates of various inspection points of the GGL-2 arch rib pre-assembled component according to an embodiment of the present invention;

[0043] Figure 9 Schematic diagram of virtual splicing of pre-assembled arch rib components GGL-2 and GGL-3 according to an embodiment of the present invention;

[0044] Figure 10 A coordinate comparison diagram of the measured values and reference values of each detection point in the virtual splicing of the pre-assembled arch rib components of GGL-2 and GGL-3 according to the embodiment of the present invention;

[0045] Figure 11 This is a schematic diagram of the linear monitoring of the GGL-4 arch rib pre-assembly component installation according to an embodiment of the present invention;

[0046] Figure 12This is a schematic diagram of the outline and center axis distribution of the GGL-4 arch rib pre-assembled components according to an embodiment of the present invention;

[0047] Figure 13 This is a schematic diagram of the control point distribution of the GGL-4 arch rib pre-assembly component according to an embodiment of the present invention;

[0048] Figure 14(a) is a schematic diagram of the Y-axis horizontal deviation of the pre-assembled components of the GGL-4 arch rib;

[0049] Figure 14(b) is a schematic diagram of the vertical deviation of the GGL-4 arch rib pre-assembled components along the Z axis;

[0050] Figure 15 This is a schematic diagram of the prism distribution of the pre-assembled components of the GGL-4 arch rib;

[0051] Figure 16 This is a schematic diagram of the coordinate deviation of each axis of the GGL-4 arch rib pre-assembly components;

[0052] Figure 17 Schematic diagram comparing the design and actual alignment of a steel box tied arch bridge.

[0053] Description of Figure Numbers:

[0054] 1. The first BIM three-dimensional model; 2. The first point cloud model; 3. GGL-3 arch rib pre-assembly components; 4. GGL-2 arch rib pre-assembly components; 5. The first point cloud model of the GGL-3 arch rib pre-assembly components; 6. The first point cloud model of the GGL-2 arch rib pre-assembly components; 7. GGL-2 and GGL-3 pre-assembled arch rib segments; 8. GGL-4 arch rib pre-assembly components; 9. Upper edge contour line; 10. Lower edge contour line; 11. Central axis.

[0055] The realization of the objectives, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0057] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0058] Moreover, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0059] See also Figure 1-3 According to one aspect of the present invention, the present invention provides a method and system for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning, wherein the method comprises the following steps:

[0060] S1. Constructing a first BIM three-dimensional model of each arch rib pre-assembled component according to the drawing information and parameter information of each arch rib pre-assembled component;

[0061] S2. Perform 3D laser scanning on each pre-assembled arch rib component to construct a first point cloud model of each pre-assembled arch rib component;

[0062] S3, fitting the first BIM three-dimensional model of each arch rib pre-assembled component with the first point cloud model, and determining whether the quality of the arch rib pre-assembled component meets the standard;

[0063] S4. Performing spatial operations on the first BIM three-dimensional model of each pre-assembled arch rib component to obtain a second BIM three-dimensional model of the arch rib segment;

[0064] S5. Confirm the location of the on-site measurement station, install and weld the pre-assembled arch rib components, and perform 3D laser scanning on the assembled arch rib segments to obtain a second point cloud model of the arch rib segments;

[0065] S6. Performing a quadratic fit on the second point cloud model of the arch rib segment and the second BIM three-dimensional model, and comparing the coordinate deviation of the arch rib segment in real time to monitor the deviation of the arch rib segment.

[0066] Specifically, in this embodiment, the main bridge of a steel box tie rod is a bottom-through tie rod arch bridge with a basket-type steel box structure. Figure 4 -5, the main bridge has a span of 230m and a deck width of 43.4m. The deck system adopts a whole-width steel-concrete composite system. The steel arch ribs are designed to be 46m high and are inclined inward at 12°. The steel structure weighs approximately 7,400t and is prefabricated and assembled. The upper structure of the approach bridge is a stress-prefabricated small box girder arranged in a double-span section. The steel box tied arch bridge not only increases the channel clearance from level four to level three, but also widens the two-way four-lane road to two-way six-lane road, and adds sidewalks and non-motorized vehicle lanes. Among them, the steel box arch ribs are divided into several sections of arch rib pre-assembled components before splicing, such as GGL-1, GGL-2, GGL-3, GGL-4 and other sections of arch rib pre-assembled components.

[0067] Specifically, in this embodiment, Building Information Modeling (hereinafter referred to as BIM) is the process of converting a planar drawing into a 3D model of space. With the rapid upgrading of computer technology and the continuous improvement of the degree of informatization, BIM technology has been integrated with more and more high-tech technologies, further expanding its scope, such as BIM and virtual reality technology, BIM and 3D printing technology, BIM and intelligent total station technology, etc. Therefore, BIM technology can enable people to have a more comprehensive understanding of the various data of the model, whether in the implementation process of the project or the subsequent inspection stage, and then carry out reasonable construction and subsequent maintenance. At present, BIM technology has been built into a complete set of construction projects and facilities for the entire life cycle. It has application advantages such as three-dimensional visualization, construction simulation, work coordination and linkage, optimization and mappability throughout the entire life cycle of the project, realizing the visualization of the entire life cycle of the project. On the basis of visualization, project information is exchanged and model defects are predicted, thereby avoiding project losses caused by data limitations and improving the construction efficiency of the project.

[0068] Specifically, in this embodiment, 3D laser scanning technology, also known as real-scene replication technology, is based on the principle of laser ranging. It uses a scanner to collect surface information of a target object. The scanner emits a laser beam at the target object, which is reflected by the object's surface and then received by the scanner's receiver. This allows for the rapid and efficient acquisition of massive point cloud data containing information such as the object's three-dimensional coordinates, texture, and color. Using data processing software compatible with the scanner, the point cloud data acquired by all scanning stations is spliced, denoised, and streamlined. Subsequently, specialized software is used to perform reverse modeling on the processed point cloud data, sequentially converting points to lines, lines to surfaces, and surfaces to volumes. Finally, a highly realistic, accurate, and complete three-dimensional point cloud model is generated. Without contacting the object, 3D laser scanning technology can quickly acquire the three-dimensional coordinates, reflectivity, and color information of each sampling point on the object's surface. This technology then generates a point cloud containing both coordinate information and influence information. This point cloud dataset is then spliced together to create a three-dimensional model of the scanned object. Combined with BIM technology, this technology can play a significant role in model monitoring.

[0069] Specifically, in this embodiment, Figure 6-8As shown, taking the GGL-2 arch rib pre-assembled component as an example, whether its quality meets the standards is judged, a first BIM three-dimensional model of the arch rib pre-assembled component is constructed according to the drawing information and parameter information of the GGL-2 arch rib pre-assembled component, and 3D laser scanning technology is used to scan it to obtain a first point cloud model of the GGL-2 arch rib pre-assembled component, the first BIM three-dimensional model of the GGL-2 arch rib pre-assembled component and the first point cloud model are imported into Geomagic Control software, and the two models are fitted once by using points, lines, surfaces, etc. as benchmarks to fit into one model, and after three-dimensional calculation and comparative analysis, the three-dimensional coordinates of each corresponding point on the surface of the first BIM three-dimensional model of the GGL-2 arch rib pre-assembled component and the first point cloud model are obtained respectively, and according to The three-dimensional coordinates of each corresponding point on the surface of the first BIM three-dimensional model and the first point cloud model are used to obtain the three-dimensional coordinate difference of each corresponding point on the surface of the first BIM three-dimensional model and the first point cloud model; thereby, whether the quality of the arch rib pre-assembly component meets the standard is judged according to the three-dimensional coordinate difference, and a test report of the GGL-2 arch rib pre-assembly component can be generated; if the three-dimensional coordinate difference is less than the first standard value, the quality of the arch rib pre-assembly component meets the standard; otherwise, the arch rib pre-assembly component is corrected again; at the same time, the first BIM three-dimensional model of each arch rib pre-assembly component is updated in real time according to the data of the detection point in the first point cloud model of the arch rib pre-assembly component; wherein, the three-dimensional coordinate difference is the manufacturing error of the GGL-2 arch rib pre-assembly component.

[0070] Specifically, in this embodiment, the number of inspection points on each surface of the GGL-2 arch rib pre-assembly component is huge. Here, 8 inspection points with different color differences in the deviation-intensive area of the GGL-2 arch rib pre-assembly component are selected as typical examples of the processing and manufacturing errors of the GGL-2 arch rib pre-assembly component; the reference value of each point is compared with the measured value coordinates, wherein the reference value is the numerical value of several preferred inspection points in the first BIM three-dimensional model of the GGL-2 arch rib pre-assembly component, and the measured value is the numerical value of several preferred inspection points in the first point cloud model of the GGL-2 arch rib pre-assembly component. The error data of each inspection point of the GGL-2 arch rib pre-assembly component are shown in Table 1. It can be found that the manufacturing error of each inspection point of the GGL-2 arch rib pre-assembly component does not exceed 1.2 mm, which meets the design specification of the first standard value, wherein the first standard value is 2 mm.

[0071]

[0072] Table 1 3D detection of arch rib pre-assembly component manufacturing error data

[0073] Specifically, in this embodiment, the three-dimensional spatial operation and assembly of each arch rib pre-assembled component are performed on the basis that the quality of each arch rib pre-assembled component meets the standard and meets the manufacturing error. The first BIM three-dimensional model of each arch rib pre-assembled component that meets the manufacturing error is spatially operated, specifically, each arch rib pre-assembled component that meets the manufacturing error is pre-assembled in turn, so as to obtain a second BIM three-dimensional model of the arch rib segment; at the same time, the position of the on-site survey station is confirmed, and after the arch rib is installed and welded, the spliced arch rib segment is scanned at the survey station using 3D laser scanning technology to obtain a second point cloud model of the arch rib segment that is actually installed; the second point cloud model of the arch rib segment is quadratically fitted with the second BIM three-dimensional model, and the coordinate deviation of the arch rib segment is compared in real time to monitor the deviation of the arch rib segment; wherein, a number of control points are set on the second point cloud model of the arch rib segment, and by identifying The control points fit the second point cloud model of the arch rib segment and the arch rib axis of the second BIM three-dimensional model; by comparing the coordinate deviations between each control point in the second point cloud model and the coordinate points corresponding to each control point in the second BIM three-dimensional model in real time, it is judged whether the linear shape of the arch rib segment deviates; if the coordinate deviation is less than the second standard value, it is judged that the linear shape of the arch rib segment has not deviated, and the second BIM three-dimensional model of the arch rib segment is updated in real time according to the data of each control point in the second point cloud model of the arch rib segment, and the coordinate data of the next arch rib segment is derived; if the coordinate deviation is greater than the second standard value, it is judged that the linear shape of the arch rib segment deviates, and the linear shape of the arch rib segment is corrected according to the coordinate deviation.

[0074] Specifically, in this embodiment, Figure 9-10 As shown, taking the virtual assembly of GGL-2 arch rib pre-assembled components and GGL-3 arch rib pre-assembled components as an example, the four corner points and four side midpoint errors of the rectangular cross-section at the interface of the GGL-2 arch rib pre-assembled components and the GGL-3 arch rib pre-assembled components are selected as preferred control points, and the second point cloud model of the arch rib segment is quadratically fitted with the second BIM three-dimensional model. The error data of the control points are exported by Geomagic Control software as shown in Table 2, and the coordinates of each measured value and the reference value are shown, wherein the reference value is the numerical value of several preferred control points in the second BIM three-dimensional model of the arch rib segment, and the measured value is the numerical value of several preferred detection points in the second point cloud model of the arch rib segment. The coordinate errors of the GGL-2 arch rib pre-assembled components and the GGL-3 arch rib pre-assembled components after splicing are both greater than 1.1 mm, less than the second standard value, and meet the requirements of the design specification. The second standard value is 2 mm.

[0075]

[0076] Table 2 3D detection of arch rib segment splicing error data

[0077] Specifically, in this embodiment, Figure 11-1 As shown in FIG4 , taking the GGL-4 arch rib pre-assembled component as an example, the longitudinal direction of the bridge is the x-axis, the transverse direction of the bridge is the y-axis, and the vertical direction is the z-axis, a number of control points are set on the GGL-4 arch rib pre-assembled component, and then the installed GGL-4 arch rib pre-assembled component is scanned at the measuring station, and the upper edge contour line, lower edge contour line and central axis of the arch rib are obtained after the second point cloud model is established; then, the control points in the second point cloud model are compared with the second BIM three-dimensional model of the GGL-4 arch rib pre-assembled component. Fitting is performed to detect the horizontal offset and vertical settlement of the arch rib line, and an error analysis report can be exported. Here, the six control points of the upper edge contour line of the GGL-4 arch rib pre-assembly component in the linear monitoring process are preferred; as shown in Table 3, after the GGL-4 arch rib pre-assembly component is spliced with the GGL-3 arch rib pre-assembly component, the cantilever end of the GGL-4 arch rib pre-assembly component sinks vertically by about 7.7 cm and deviates horizontally outward by about 3.5 cm. The deviations are both greater than the second standard value, which does not meet the requirements of the design specification.

[0078]

[0079] Table 3 GGL-4 arch rib pre-assembled component linear deviation data table

[0080] Specifically, in this embodiment, Figure 15-17 As shown, in step S6, the second point cloud model of the arch rib segment is quadratically fitted with the second BIM three-dimensional model, and the coordinate deviation of the arch rib segment is compared in real time to monitor the deviation of the arch rib segment. After completion, the deviation accuracy of the assembled arch rib segment needs to be verified; taking the GGL-4 arch rib pre-assembled component after splicing as an example, prisms are installed at the two end interfaces and the upper and lower edges of the middle part of the GGL-4 arch rib pre-assembled component, where A001, A002, A003, A004, A005, and A006 are installation points. The coordinates of the installation points are then collected using a total station, and the coordinate data are compared with the corresponding points in the second point cloud model of the GGL-4 arch rib pre-assembled component, as shown in Table 4:

[0081]

[0082] Table 4 Comparison of coordinate measurement accuracy between 3D laser scanner and total station

[0083] After comparison, it can be seen that the axis deviations of the measurement data of the installation points collected by the total station and the coordinate data of the corresponding points in the second point cloud model are within 1-3mm, and the average deviation is within 1.3-1.7mm, so that it can be verified that the deviation accuracy of the assembled arch rib segments meets the requirements of engineering design. After the bridge is completed according to the design requirements, the deviation of the arch rib axis is within the overall control range of ±10mm. The actual error of the arch rib axis after the bridge is completed is less than 6mm, which meets the design accuracy requirements. Compared with the traditional detection method, its monitoring accuracy is improved to a certain extent.

[0084] According to another aspect of the present invention, the present invention provides a method and system for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning, wherein the system includes: a storage unit and a processing unit, wherein the storage unit stores a computer program that can be run on the processing unit; when the processing unit executes the computer program, the method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning is implemented.

[0085] In order to facilitate the understanding of the relevant terms of the present invention, an explanation is given here:

[0086] Tie-arch bridge: A type of bridge that combines the advantages of both arches and beams. It combines the two basic structural forms of arch and beam to jointly bear the load, giving full play to the structural performance and combined effect of the beam being bent and the arch being compressed. The horizontal thrust at the arch end is borne by the tie rods, so that the arch end support does not generate horizontal thrust.

[0087] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning, characterized in that: The following steps are involved: S1. Constructing a first BIM three-dimensional model of each arch rib pre-assembled component according to the drawing information and parameter information of each arch rib pre-assembled component; S2. Perform 3D laser scanning on each pre-assembled arch rib component to construct a first point cloud model of each pre-assembled arch rib component; S3, fitting the first BIM three-dimensional model of each arch rib pre-assembled component with the first point cloud model, and determining whether the quality of the arch rib pre-assembled component meets the standard; S4. Performing spatial operations on the first BIM three-dimensional model of each pre-assembled arch rib component to obtain a second BIM three-dimensional model of the arch rib segment; S5. Confirm the location of the on-site measurement station, install and weld the pre-assembled arch rib components, and perform 3D laser scanning on the assembled arch rib segments to obtain a second point cloud model of the arch rib segments; S6. Setting a plurality of control points on the second point cloud model of the arch rib segment, performing a quadratic fit between the second point cloud model of the arch rib segment and the second BIM three-dimensional model, and comparing the coordinate deviation of the arch rib segment in real time to monitor the deviation of the arch rib segment, specifically: S61, performing a secondary fitting on the second point cloud model of the arch rib segment and the second BIM three-dimensional model, and fitting the second point cloud model of the arch rib segment and the arch rib axis of the second BIM three-dimensional model by identifying each control point; S62, determining whether the linear shape of the arch rib segment deviates by comparing in real time the coordinate deviations between each control point in the second point cloud model and the coordinate points corresponding to each control point in the second BIM three-dimensional model; S63: If the coordinate deviation is less than the second standard value, it is determined that the linear shape of the arch rib segment has not deviated, and the second BIM three-dimensional model of the arch rib segment is updated in real time according to the data of each control point in the second point cloud model of the arch rib segment, and the coordinate data of the next arch rib segment is derived; S64: If the coordinate deviation is greater than the second standard value, it is determined that the linear shape of the arch rib segment has deviated, and the linear shape of the arch rib segment is corrected according to the coordinate deviation; The deviation accuracy of the assembled arch rib segments is verified, specifically: prisms are installed at the installation points set at the two end interfaces and the upper and lower edges of the middle of the arch rib pre-assembled components, and then the coordinates of the installation points are collected using a total station, and the coordinate data are compared with the corresponding points in the second point cloud model of the arch rib pre-assembled components.

2. The method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning according to claim 1, characterized in that: The step S3 specifically includes the following steps: S31, fitting the first BIM three-dimensional model of each pre-assembled arch rib component with the first point cloud model to obtain the three-dimensional coordinates of each corresponding point on the surface of the first BIM three-dimensional model and the first point cloud model respectively; S32: Obtain three-dimensional coordinate differences between corresponding points on the surfaces of the first BIM three-dimensional model and the first point cloud model according to the three-dimensional coordinates of corresponding points on the surfaces of the first BIM three-dimensional model and the first point cloud model; S33. Determine whether the quality of the arch rib pre-assembled component meets the standard based on the three-dimensional coordinate difference; if the three-dimensional coordinate difference is less than a first standard value, determine that the quality of the arch rib pre-assembled component meets the standard; otherwise, re-correct the arch rib pre-assembled component.

3. The method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning according to claim 2, characterized in that: After the step of determining whether the quality of the pre-assembled arch rib components meets the standards, the method further comprises: The first BIM three-dimensional model of the arch rib pre-assembly component is updated according to the data of each corresponding point in the first point cloud model of the arch rib pre-assembly component.

4. The method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning according to claim 2, characterized in that: The three-dimensional coordinate difference is the manufacturing error of the arch rib pre-assembled component.

5. The method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning according to claim 4 is characterized in that: The spatial operation performed on the first BIM three-dimensional model of each arch rib pre-assembly component in step S4 is specifically to sequentially implement the pre-assembly of each arch rib pre-assembly component.

6. The method for monitoring the quality of steel box arch ribs based on BIM and 3D laser scanning according to claim 2, characterized in that: The first standard value and the second standard value are both 2 mm.

7. A steel box arch rib quality monitoring system based on BIM and 3D laser scanning, characterized in that: It includes a storage unit and a processing unit, wherein the storage unit stores a computer program that can be run on the processing unit; when the processing unit executes the computer program, it implements a steel box arch rib quality monitoring method based on BIM and 3D laser scanning as described in any one of claims 1 to 6.

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