Digital assembling method and device for a welded and bolted combined bridge structure

Abstract

The application relates to the technical field of bridge engineering, in particular to a digital assembling method and device for a welded and bolted combined bridge structure. Point cloud data of a node plate and a steel truss beam are acquired, and corresponding three-dimensional geometric models are generated; a bridge design model of the node plate and the steel truss beam is acquired, and parameters of the three-dimensional geometric models of the node plate and corresponding truss segments of the steel truss beam are compared with those of the bridge design model, so that actual hole opening positions of each node plate are acquired; the node plate and the steel truss beam are assembled according to the positional relationship between bolt hole position coordinates of a web member of the steel truss beam and the actual hole opening positions; and the size value of a weld seam in the bridge longitudinal direction and a welding allowance are acquired by comparing the posture of the three-dimensional geometric model of the steel truss beam with the design posture of the bridge design model. The application guides the actual assembling process through digital assembling, reduces the rework amount and reduces the alignment error, and improves the construction efficiency and the splicing quality.

Description

Technical Field

[0001] This application relates to the field of bridge engineering technology, specifically to a digital assembly method and apparatus for welded and bolted combined bridge structures. Background Technology

[0002] As modern long-span bridge structures increasingly develop towards larger sizes, lighter weights, and more prefabricated components, welded-bolted composite structures are widely used in actual splicing processes due to their advantages such as adaptability to different working conditions, reasonable load-bearing capacity, and convenient construction. This type of structure typically consists of a welded top area and a bolted bottom area, forming a stable and highly adaptable structural system, widely used in major infrastructure projects such as high-speed railway bridges, long-span highway bridges, and urban overpasses.

[0003] However, with the increase in structural span and the variety of members, relying solely on design drawings for assembly can lead to problems such as manufacturing deviations during actual production (including deviations in member dimensions from the design and offsets in node plate holes), slight deformations during transportation (such as bending and torsion), and cumulative errors during installation (the continuous propagation and amplification of small errors generated at each assembly stage). These issues result in difficulties in alignment during assembly, excessive welding gaps, and misaligned bolt holes. This is especially true for the assembly of welded-bolted composite structures. Deviations resulting from the combined effects of production and installation, if not adjusted promptly, will increase on-site adjustments and rework, reduce construction efficiency, and even negatively impact the overall structural mechanical properties and service safety. Therefore, achieving high-speed and precise assembly of welded-bolted composite structures is a major practical issue that needs attention in current intelligent bridge construction. Summary of the Invention

[0004] In the assembly and construction of welded-bolted composite bridge structures, deviations caused by the combined effects of production and installation processes accumulate, increasing on-site adjustments and rework, reducing construction efficiency, and even negatively impacting the overall mechanical properties and service safety of the structure.

[0005] In a first aspect, embodiments of this application provide a digital assembly method for a welded and bolted combined bridge structure, the digital assembly method for the bridge comprising:

[0006] Acquire point cloud data of node plates and steel truss beams, and perform reverse modeling based on the point cloud data to generate corresponding three-dimensional geometric models;

[0007] Obtain the bridge design model of the gusset plate and steel truss girder, and compare the parameters of the three-dimensional geometric model of the gusset plate and the corresponding steel truss girder segment with the bridge design model to obtain the actual opening position of each gusset plate.

[0008] The coordinates of the bolt holes on the web members are obtained from the three-dimensional geometric model of the steel truss girder. The attitude of the overall three-dimensional geometric model of the steel truss girder is adjusted according to the positional relationship between the bolt hole coordinates and the actual opening positions in order to complete the assembly of the node plate and the steel truss girder.

[0009] The posture of the assembled steel truss girder three-dimensional geometric model is compared with the design posture of the bridge design model to obtain the weld size and welding cut amount in the longitudinal direction of the bridge.

[0010] The gusset plates are drilled according to their actual opening positions, and the welding process of the steel truss is adjusted according to the weld size and welding cut amount along the bridge direction.

[0011] In conjunction with the first aspect, in one embodiment, the step of adjusting the attitude of the overall three-dimensional geometric model of the steel truss girder based on the positional relationship between the bolt hole coordinates and the actual opening positions to complete the assembly of the node plate and the steel truss girder includes:

[0012] Based on the positional relationship between the bolt hole coordinates and the actual opening positions, the overall three-dimensional geometric model of the steel truss is rotated and / or translated until the overall three-dimensional geometric model of the steel truss is aligned with the three-dimensional geometric model of the gusset plate.

[0013] In conjunction with the first aspect, in one embodiment, the step of rotating and translating the overall three-dimensional geometric model of the steel truss beam according to the positional relationship between the bolt hole coordinates and the actual opening positions until the overall three-dimensional geometric model of the steel truss beam is aligned with the three-dimensional geometric model of the gusset plate includes:

[0014] During the assembly and alignment of the overall three-dimensional geometric model of the steel truss, the rigid body registration method is used to register the bolt hole coordinates with the actual hole position coordinates to ensure that the web member holes of the steel truss are aligned with the node plate.

[0015] Based on the adjustment parameters during the alignment process between the web members and the gusset plates of the steel truss, a rigid body transformation is performed on the overall three-dimensional geometric model of the steel truss to obtain the actual posture model of the steel truss.

[0016] In conjunction with the first aspect, in one embodiment, the step of performing a rigid body transformation on the overall three-dimensional geometric model of the steel truss girder based on the adjustment parameters during the alignment process between the web members and the gusset plates to obtain the actual posture model of the steel truss girder includes:

[0017] Based on the translation and rotation parameters of the web members during the alignment process, a rigid body transformation is performed on the overall three-dimensional geometric model of the steel truss to obtain the actual posture model of the steel truss.

[0018] In conjunction with the first aspect, in one embodiment, after registering the bolt hole coordinates with the actual opening coordinates using the rigid body registration method during the assembly and alignment of the overall three-dimensional geometric model of the steel truss beam, the method further includes:

[0019] The coordinates of the bolt holes in the web members of the steel truss are projected onto the surface of the gusset plate, and an error vector analysis is performed on the projected coordinates of the bolt holes and the actual opening positions of the gusset plate.

[0020] In conjunction with the first aspect, in one implementation, acquiring the point cloud data of the node plate and the steel truss girder includes:

[0021] The node plates and steel trusses to be assembled are subjected to laser scanning with an accuracy better than 1 mm to obtain point cloud data of the node plates and steel trusses.

[0022] In conjunction with the first aspect, in one embodiment, the step of acquiring point cloud data of the node plate and steel truss girder to be assembled using laser scanning with an accuracy better than 1 mm includes:

[0023] Laser scanning is performed on the node plate to be assembled to obtain point cloud data of the node plate mounting surface, edge contour, and area to be bolted.

[0024] Laser scanning is performed on the steel truss to obtain point cloud data of the end regions of the web members that mate with the gusset plates and the overall truss structure.

[0025] In conjunction with the first aspect, in one embodiment, comparing the three-dimensional geometric model of the node plate and the corresponding steel truss segment with the bridge design parameters to obtain the actual opening position of each node plate includes:

[0026] Data fitting is performed on the three-dimensional geometric model of the gusset plate to obtain the position information and morphological parameters of all gusset plates in each steel truss segment;

[0027] The location information and morphological parameters of each node plate are compared and analyzed with the design parameters of the corresponding bridge node plate design model.

[0028] Based on the comparative analysis results, the opening positions of the node plates in the comparison parameters are corrected to obtain the actual opening positions of the node plates.

[0029] In conjunction with the first aspect, in one embodiment, comparing the orientation of the assembled steel truss girder's three-dimensional geometric model with the bridge's design orientation to obtain the weld size and welding allowance along the bridge's longitudinal direction includes:

[0030] The three-dimensional geometric model of the assembled steel truss girder is compared and analyzed with the overall design model of the steel truss girder to obtain the offset of the two in the longitudinal direction of the bridge.

[0031] Calculate the weld gap size and the required welding cut amount based on the offset.

[0032] Secondly, embodiments of this application provide a digital assembly device for welded and bolted combined bridge structures, comprising:

[0033] The modeling module is used to acquire point cloud data of node plates and steel truss beams and bridge design models. The modeling module is also used to perform reverse modeling based on point cloud data to generate corresponding three-dimensional geometric models.

[0034] The design parameter comparison module is used to compare the parameters of the three-dimensional geometric model of the node plate and the corresponding steel truss segment with the bridge design model to obtain the actual opening position of each node plate.

[0035] The assembly module is used to obtain the bolt hole coordinates on the web members based on the three-dimensional geometric model of the web members of the steel truss. The assembly module is also used to adjust the posture of the overall three-dimensional geometric model of the steel truss based on the positional relationship between the bolt hole coordinates and the actual opening positions to complete the assembly of the node plate and the steel truss.

[0036] The weld evaluation module is used to compare the posture of the three-dimensional geometric model of the assembled steel truss with the design posture of the bridge design model in order to obtain the weld size value and welding cut amount in the longitudinal direction of the bridge.

[0037] The process adjustment module is used to open holes in the node plate according to the actual opening position of the node plate, and to adjust the welding process of the steel truss girder according to the weld size value and welding trim amount in the longitudinal direction of the bridge.

[0038] The beneficial effects of the technical solutions provided in this application include:

[0039] This application guides the actual assembly process through digital assembly, reducing rework and alignment errors, and improving construction efficiency and splicing quality. Attached Figure Description

[0040] Figure 1 This is a flowchart illustrating an embodiment of the bridge assembly method for the point cloud inverse model of this application.

[0041] Figure 2 This is a schematic diagram of the hardware structure of the bridge assembly equipment based on the point cloud inverse model involved in the embodiments of this application. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0043] In the assembly and construction of welded-bolted composite bridge structures, deviations caused by the combined effects of production and installation processes accumulate, increasing on-site adjustments and rework, reducing construction efficiency, and even negatively impacting the overall mechanical properties and service safety of the structure.

[0044] It is worth noting that this application addresses improvements to the assembly and construction of welded-bolted composite bridge structures. The construction process of welded-bolted composite bridges includes the bolted assembly and fitting of the web members and node plates of the steel truss girder, as well as the welding process of the steel truss girder segments. Because the bolted assembly and fitting of the web members and node plates of the steel truss girder requires high precision, the bolted assembly and fitting are generally corrected first, followed by adjustments to the welding process. In the welded-bolted composite node structure, the upper connection is welded, and the lower connection is bolted, with the lower bolted connection using point cloud guidance to position the holes.

[0045] In a first aspect, embodiments of this application provide a digital assembly method for a welded and bolted combined bridge structure, the digital assembly method for the bridge comprising:

[0046] Step S1: Obtain point cloud data of node plates and steel truss beams and bridge design model, and perform reverse modeling based on point cloud data to generate corresponding three-dimensional geometric models.

[0047] It is understandable that the bridge design model is a preliminary model established based on design parameters at the initial stage of bridge design. However, during the splicing and construction according to the design model and parameters, manufacturing deviations during actual production (including deviations in member dimensions from the design and offsets in node plate holes), slight deformations during transportation (such as bending and torsion), and cumulative errors during installation (small errors generated in each splicing link continuously propagate and amplify) can all lead to problems such as difficulty in alignment during splicing, excessive welding gaps, and misalignment of bolt holes. Therefore, digital assembly is needed to guide welding and bolting.

[0048] Step S1 above includes:

[0049] Step S1a: Obtain the bridge design model of the node plate and steel truss.

[0050] Specifically, the bridge design model is established based on design parameters. Therefore, key bridge design information that needs to be used in subsequent steps can be extracted from the bridge design model. Key bridge design information includes: the spacing between slabs in the longitudinal direction and the spacing between slabs in the transverse direction.

[0051] Step S1b: Obtain point cloud data of node plates and steel truss beams.

[0052] Specifically, the node plates and steel trusses to be assembled are subjected to laser scanning with an accuracy better than 1 mm to obtain point cloud data of the node plates and steel trusses.

[0053] It is worth noting that the point cloud scanning accuracy is better than 1 millimeter, ensuring the accuracy of subsequent reverse modeling.

[0054] Optionally, a stand-alone 3D laser scanner, such as the S150 with an accuracy of 1mm, can be used to perform high-precision scanning of the bridge truss components to be assembled to obtain point cloud data.

[0055] Furthermore, the point cloud data in the above steps includes: For the node plate used for bolted connections, the point cloud data includes key features such as the mounting surface, edge contour, and area to be bolted. For the steel truss segment used for top-face welding and ground bolting, the point cloud data includes the end area of ​​the web members that mate with the node plate and its overall truss structure.

[0056] Step S1c: Perform reverse modeling based on point cloud data to generate the corresponding three-dimensional geometric model.

[0057] Specifically, the point cloud data was processed into three dimensions using the reverse modeling software Polyworks to reconstruct the geometric models of the node plates and truss segments.

[0058] It is worth noting that reverse modeling can employ methods such as triangulation and parametric modeling. The modeled result can calculate the dimensions, hole positions, and locations of the node plates to facilitate comparison with design drawings.

[0059] Step S2: Compare the parameters of the three-dimensional geometric model of the node plate and the corresponding steel truss segment with the bridge design model to obtain the actual opening position of each node plate.

[0060] It should be noted that the design parameters of the node board may deviate during actual production. If holes are drilled into the physical node board according to the design parameters, the drilling positions will be off. In this application, the node board collected in step S1 is an un-drilled node board. In this step, point cloud model analysis is required to determine the drilling positions.

[0061] Step S2 above includes:

[0062] Step S2a: Obtain the position information and shape parameters of all node plates of each steel truss segment.

[0063] Specifically, the normal plane of the mounting surface and the spacing between multiple node plates are extracted from the node plate model.

[0064] Furthermore, key parameters of the node board are obtained by using feature data fitting to obtain the inverse model of the node board.

[0065] It's worth noting that the parameters obtained through fitting are used for comparative analysis with the parameters of the design model to obtain the actual opening positions. This is because the distances between different node plates are calculated using the fitted corner coordinates. Key parameters of the node plates can be obtained from the reverse model using software point selection or algorithmic fitting. Software point selection can be performed using tools such as PolyWorks, SolidWorks, and CloudCompare, where coordinates are obtained by manually clicking on approximate corner positions. Algorithmic fitting, on the other hand, involves planar intersection, thus providing more objective data.

[0066] Step S2b: Compare and analyze the position information and shape parameters of each node plate with the design parameters of the corresponding bridge node plate, and correct the opening position of the node plate in the design parameters according to the comparison and analysis results, so as to obtain the actual opening position of the node plate.

[0067] Specifically, data from multiple gusset plates on the truss segment is extracted, and the distances between these gusset plates are calculated. The analysis determines whether the distance between individual gusset plates exceeds the limit, the difference between the distances between multiple gusset plates and the design values, the opening positions are adjusted based on the differences, and the corner coordinates of the longitudinal distance are fitted.

[0068] It is worth noting that the design parameters of the bridge design model in step S2b above include: the spacing between the plates in the longitudinal direction of the bridge and the spacing between the plates in the transverse direction of the bridge. Based on the deviation of these distances, the opening is offset towards the larger or lower mileage, thereby obtaining the actual opening position of the node plate.

[0069] Step S3: Obtain the bolt hole coordinates on the web members based on the three-dimensional geometric model of the steel truss girder, and adjust the posture of the overall three-dimensional geometric model of the steel truss girder according to the positional relationship between the bolt hole coordinates and the actual opening positions to complete the assembly of the node plate and the steel truss girder.

[0070] Step S3 above includes:

[0071] Step S3a: The actual bolt hole coordinates at the ends of the web members of the steel truss beam established in step S1.

[0072] Specifically, the actual bolt hole coordinates at the ends of the web members of the steel truss are extracted using the RANSAC algorithm.

[0073] Step S3b: Based on the positional relationship between the bolt hole coordinates and the actual opening positions, rotate and / or translate the overall three-dimensional geometric model of the steel truss beam until the overall three-dimensional geometric model of the steel truss beam is aligned with the three-dimensional geometric model of the node plate.

[0074] Specifically, during the assembly and alignment of the overall three-dimensional geometric model of the steel truss, the rigid body registration method is used to register the bolt hole coordinates with the actual hole position coordinates to ensure that the web member holes of the steel truss are aligned with the node plate.

[0075] Preferably, during the assembly and alignment process, nearest neighbor matching or least squares method is used as the rigid body registration method to realize the attitude transformation calculation between models.

[0076] It's worth noting that the nearest neighbor matching method is used for point pair establishment and offers fast matching speed. The least squares method, on the other hand, is used to calculate the optimal rotation and translation matrix based on point pairs, improving alignment accuracy beyond simple matching. Operators can choose the appropriate assembly method based on the actual working conditions.

[0077] Furthermore, the registration process between the steel truss beam and the gusset plate also includes projecting the coordinates of the web bolt holes onto the surface of the gusset plate and performing error vector analysis.

[0078] It's worth noting that if the opening positions on the gusset plate are consistent with the design values, there will be no error, and the coordinate projection of the web bolt holes and the opening positions should be completely coincident. However, in actual assembly, the actual opening positions are obtained after adjustment, so there will be a slight misalignment between the two holes on the gusset plate and the web bolt. Error vector analysis after projection can detect the direction and magnitude of these misalignments, and determine whether the bolt can be inserted.

[0079] Step S3c: Perform rigid body transformation on the overall three-dimensional geometric model of the steel truss beam according to the translation and rotation parameters of the web members during the alignment process to obtain the actual posture model of the steel truss beam.

[0080] It is worth noting that step S3c synchronizes the truss segment and the web member to achieve a positional orientation of the welded component under optimal bolted matching, which serves as the actual orientation model of the entire steel truss beam.

[0081] Step S4: Compare the posture of the assembled steel truss three-dimensional geometric model with the design posture of the bridge design model to obtain the weld size and welding trim amount along the bridge direction.

[0082] Specifically, the actual posture model of the steel truss obtained in step S3 is compared and analyzed with the design model of the steel truss to obtain the offset of the two in the longitudinal direction of the bridge; then the weld gap size and the required welding trim amount are calculated based on the offset.

[0083] Step S5: Drill holes in the node plate according to the actual hole positions, and adjust the welding process of the steel truss girder according to the weld size and welding trim amount along the bridge direction.

[0084] Furthermore, the calculation of the welding cut amount is based on the linear error between the truss segment model posture and the design posture in the longitudinal direction, and the weld adjustment suggestions are automatically generated.

[0085] In some preferred embodiments, the assembly posture and weld dimensions of the actual posture model of the steel truss can be output as a digital assembly report or model file for on-site construction guidance and assembly quality assessment. Based on these results, operators guide the actual opening of the node plates and the welding adjustments of the steel truss, achieving precise digital assembly of the bridge structure.

[0086] In some alternative implementations, the above steps S1-S5 can be completed through a unified digital platform to integrate and process data, and finally generate a digital assembly output file containing the following: node plate opening coordinate file, truss segment attitude error analysis report, welding and cutting suggestion report, and visual assembly model.

[0087] The above results are used to guide the on-site node plate hole processing, steel truss beam positioning and weld construction, significantly reducing the rework rate caused by on-site errors and improving the assembly efficiency and quality control capability of bridge steel structures.

[0088] Secondly, this application provides a digital assembly device for welded and bolted combined bridge structures, comprising: a modeling module, a design parameter comparison module, an assembly module, and a weld evaluation module; wherein...

[0089] The system comprises four modules: a modeling module for acquiring point cloud data of node plates and steel trusses, and a bridge design model; a reverse modeling module for generating corresponding 3D geometric models based on point cloud data; a design parameter comparison module for comparing the parameters of the 3D geometric models of node plates and corresponding steel truss segments with those of the bridge design model to obtain the actual opening positions of each node plate; an assembly module for obtaining bolt hole coordinates on the web members based on the 3D geometric model of the steel truss web members, and for adjusting the posture of the overall 3D geometric model of the steel truss girder based on the positional relationship between the bolt hole coordinates and the actual opening positions to complete the assembly of the node plates and the steel truss girder; a weld evaluation module for comparing the posture of the assembled 3D geometric model of the steel truss girder with the design posture of the bridge design model to obtain the weld size and welding trim amount in the longitudinal direction of the bridge; and a process adjustment module for opening holes in the node plates according to their actual opening positions and adjusting the welding process of the steel truss girder based on the weld size and welding trim amount in the longitudinal direction of the bridge.

[0090] The functions of each module in the digital assembly device for the above-mentioned welded and bolted combined bridge structure correspond to the steps in the above-mentioned embodiment of the digital assembly method for the welded and bolted combined bridge structure. Their functions and implementation processes will not be described in detail here.

[0091] Thirdly, embodiments of this application provide a bridge assembly device for a point cloud reverse model. The bridge assembly device for the point cloud reverse model can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0092] Reference Figure 2 , Figure 2 This is a schematic diagram of the hardware structure of the bridge assembly equipment based on the point cloud reverse model involved in the embodiments of this application. In this embodiment, the bridge assembly equipment based on the point cloud reverse model may include a processor, a memory, a communication interface, and a communication bus.

[0093] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0094] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting components within the bridge assembly equipment that implements point cloud reverse modeling, as well as interfaces used for interconnecting the bridge assembly equipment with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0095] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0096] The processor can be a general-purpose processor, which can call the bridge assembly program of the point cloud reverse model stored in the memory and execute the bridge assembly method of the point cloud reverse model provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the bridge assembly program of the point cloud reverse model is called can refer to the various embodiments of the bridge assembly method of the point cloud reverse model of this application, and will not be repeated here.

[0097] Those skilled in the art will understand that Figure 2 The hardware structure shown does not constitute a limitation of this application and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0098] Fourthly, embodiments of this application also provide a computer-readable storage medium.

[0099] This application stores a bridge assembly program for a point cloud inverse model on a computer-readable storage medium, wherein when the bridge assembly program for the point cloud inverse model is executed by a processor, it implements the steps of the bridge assembly method for the point cloud inverse model as described above.

[0100] The method implemented when the bridge assembly program of the point cloud inverse model is executed can be referred to in the various embodiments of the bridge assembly method of the point cloud inverse model of this application, and will not be repeated here.

[0101] In summary, with the continuous development and application of 3D point cloud measurement and digital assembly technologies, reverse modeling can be used for digital assembly, improving construction efficiency and assembly quality. However, current digital assembly methods are mostly concentrated on single bolted steel structures, lacking assembly methods suitable for welded-bolted combined structures. How to reverse reconstruct the collected point cloud to achieve high-speed and precise assembly of welded-bolted combined structures is a major practical problem that needs attention in current intelligent bridge construction. This application guides the actual assembly process through digital assembly, reducing rework and alignment errors, and improving construction efficiency and assembly quality.

[0102] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0103] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0104] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0105] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0106] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0107] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0108] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A digital assembly method for a combined welded and bolted bridge structure, characterized in that, The digital assembly method includes: Acquire point cloud data of node plates and steel truss beams, and perform reverse modeling based on the point cloud data to generate corresponding three-dimensional geometric models; Obtain the bridge design model of the gusset plate and steel truss girder, and compare the parameters of the three-dimensional geometric model of the gusset plate and the corresponding steel truss girder segment with the bridge design model to obtain the actual opening position of each gusset plate. The coordinates of the bolt holes on the web members are obtained from the three-dimensional geometric model of the steel truss girder. The attitude of the overall three-dimensional geometric model of the steel truss girder is adjusted according to the positional relationship between the bolt hole coordinates and the actual opening positions in order to complete the assembly of the node plate and the steel truss girder. The posture of the assembled steel truss girder three-dimensional geometric model is compared with the design posture of the bridge design model to obtain the weld size and welding cut amount along the bridge direction. The gusset plates are drilled according to their actual opening positions, and the welding process of the steel truss is adjusted according to the weld size and welding cut amount along the bridge direction. The process of comparing the parameters of the three-dimensional geometric model of the node plate and the corresponding steel truss segment with the bridge design model to obtain the actual opening position of each node plate includes: obtaining the position information and shape parameters of all node plates in each steel truss segment to extract the normal plane of the mounting surface in the node plate model and the spacing between multiple node plates, and obtaining the reverse model of the node plate and key parameters of the node plate through feature data fitting; extracting data of multiple node plates on the truss segment to calculate the distance between node plates, and judging whether the distance between individual node plates exceeds the limit; analyzing the distance difference between multiple node plates and the design parameters, the design parameters including the plate spacing in the longitudinal direction and the plate spacing in the transverse direction; adjusting the opening position to the larger or smaller mileage according to the distance difference, and calculating the corner coordinate fitting of the longitudinal distance to obtain the actual opening position of the node plate.

2. The digital assembly method for welded and bolted combined bridge structures as described in claim 1, characterized in that, The process of adjusting the attitude of the overall three-dimensional geometric model of the steel truss beam based on the positional relationship between the bolt hole coordinates and the actual opening positions to complete the assembly of the node plate and the steel truss beam includes: Based on the positional relationship between the bolt hole coordinates and the actual opening positions, the overall three-dimensional geometric model of the steel truss is rotated and / or translated until the overall three-dimensional geometric model of the steel truss is aligned with the three-dimensional geometric model of the gusset plate.

3. The digital assembly method for welded and bolted combined bridge structures as described in claim 2, characterized in that, The step of rotating and translating the overall three-dimensional geometric model of the steel truss beam according to the positional relationship between the bolt hole coordinates and the actual opening positions until the overall three-dimensional geometric model of the steel truss beam is aligned with the three-dimensional geometric model of the gusset plate includes: During the assembly and alignment of the overall three-dimensional geometric model of the steel truss, the rigid body registration method is used to register the bolt hole coordinates with the actual hole position coordinates to ensure that the web member holes of the steel truss are aligned with the node plate. Based on the adjustment parameters during the alignment process between the web members and the gusset plates of the steel truss, a rigid body transformation is performed on the overall three-dimensional geometric model of the steel truss to obtain the actual posture model of the steel truss.

4. The digital assembly method for welded and bolted combined bridge structures as described in claim 3, characterized in that, The process of performing rigid body transformation on the overall three-dimensional geometric model of the steel truss girder based on the adjustment parameters during the alignment process between the web members and the gusset plates to obtain the actual posture model of the steel truss girder includes: Based on the translation and rotation parameters of the web members during the alignment process, a rigid body transformation is performed on the overall three-dimensional geometric model of the steel truss to obtain the actual posture model of the steel truss.

5. The digital assembly method for welded and bolted combined bridge structures as described in claim 3, characterized in that, The process of assembling and aligning the overall three-dimensional geometric model of the steel truss beam using the rigid body registration method to register the bolt hole coordinates with the actual hole position coordinates also includes: The coordinates of the bolt holes in the web members of the steel truss are projected onto the surface of the gusset plate, and an error vector analysis is performed on the projected coordinates of the bolt holes and the actual opening positions of the gusset plate.

6. The digital assembly method for welded and bolted combined bridge structures as described in claim 1, characterized in that, The acquisition of point cloud data for the node plate and steel truss girder includes: The node plates and steel trusses to be assembled are subjected to laser scanning with an accuracy better than 1 mm to obtain point cloud data of the node plates and steel trusses.

7. The digital assembly method for welded and bolted combined bridge structures as described in claim 6, characterized in that, The process of acquiring point cloud data of the node plates and steel trusses to be assembled using laser scanning with an accuracy better than 1 mm includes: Laser scanning is performed on the node plate to be assembled to obtain point cloud data of the node plate mounting surface, edge contour, and area to be bolted. Laser scanning is performed on the steel truss to obtain point cloud data of the end regions of the web members that mate with the gusset plates and the overall truss structure.

8. The digital assembly method for welded and bolted combined bridge structures as described in claim 1, characterized in that, The process of comparing the orientation of the assembled steel truss girder's three-dimensional geometric model with the bridge's design orientation to obtain the weld size and welding allowance along the bridge's longitudinal direction includes: The three-dimensional geometric model of the assembled steel truss girder is compared and analyzed with the overall design model of the steel truss girder to obtain the offset of the two in the longitudinal direction of the bridge. Calculate the weld gap size and the required welding cut amount based on the offset.

9. A digital assembly device for a welded and bolted combined bridge structure, characterized in that, include: The modeling module is used to acquire point cloud data of node plates and steel truss beams and bridge design models. The modeling module is also used to perform reverse modeling based on point cloud data to generate corresponding three-dimensional geometric models. The design parameter comparison module is used to compare the parameters of the three-dimensional geometric model of the node plate and the corresponding steel truss segment with the bridge design model to obtain the actual opening position of each node plate. The process of comparing the parameters of the three-dimensional geometric model of the node plate and the corresponding steel truss segment with the bridge design model to obtain the actual opening position of each node plate includes: obtaining the position information and shape parameters of all node plates in each steel truss segment to extract the normal plane of the mounting surface in the node plate model and the spacing between multiple node plates, and obtaining the node plate reverse model and key parameters of the node plate through feature data fitting; extracting data of multiple node plates on the truss segment to calculate the distance between node plates, and judging whether the distance between individual node plates exceeds the limit; analyzing the distance difference between multiple node plates and the design parameters, which include the plate spacing in the longitudinal direction and the plate spacing in the transverse direction; adjusting the opening position to the larger or smaller mileage according to the distance difference, and calculating the corner coordinate fitting of the longitudinal distance to obtain the actual opening position of the node plate; The assembly module is used to obtain the bolt hole coordinates on the web members based on the three-dimensional geometric model of the web members of the steel truss. The assembly module is also used to adjust the posture of the overall three-dimensional geometric model of the steel truss based on the positional relationship between the bolt hole coordinates and the actual opening positions to complete the assembly of the node plate and the steel truss. The weld evaluation module is used to compare the posture of the three-dimensional geometric model of the assembled steel truss with the design posture of the bridge design model in order to obtain the weld size value and welding cut amount in the longitudinal direction of the bridge. The process adjustment module is used to open holes in the node plate according to the actual opening position of the node plate, and to adjust the welding process of the steel truss girder according to the weld size value and welding trim amount in the longitudinal direction of the bridge.

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