A BIM-based method for spatial positioning and installation of a hyperbolic grid crown ball

Abstract

The present invention provides a BIM-based method for spatially positioning and installing a truncated sphere in a hyperbolic truss, comprising the following steps: spatially positioning the truncated sphere; establishing a BIM model; pre-processing rods at height differences in the arc structure; digitally processing data using BIM software and comparing it with modeling software; performing block assembly construction; deepening and setting out the main structure using Tekla, as well as precise setting out of other structures; designing an assembled support frame; collecting three-dimensional laser scanning data on-site; performing a comprehensive analysis of the hyperbolic truss structure based on BIM; and on-site installation of the hyperbolic truss structure. The present invention can simultaneously ensure that the upper surfaces of four chord moment tubes at different angles are flush with the upper surfaces of the truncated node spheres, and that one upper chord moment tube upper surface corresponds to two upper chord spheres at different angles, and that the upper truncated sphere plane of a node sphere is flush with the upper surfaces of the chord moment tubes in four directions, thereby ensuring the flatness and installation accuracy of the truss top surface.

Description

Technical Field

[0001] The present invention relates to the technical field of positioning and installing a curved grid crown ball, and in particular to a BIM-based method for spatially positioning and installing a hyperbolic grid crown ball. Background Art

[0002] The truncated ball node, also known as the upper flat welded ball node, is a new type of node for spatial structures. It combines the advantages of welded ball and drum-shaped nodes, featuring a flat surface formed on the upper portion of the structure, reducing the height of the welded ball. However, when used in spatial irregular grids, the upper portion is a constantly changing spatial curved surface, and the upper plane of each node ball rotates with the structural shape. Positioning the truncated welded ball requires that the upper surfaces of the upper chord moment tubes at four different angles be flush with the upper surface of the truncated ball. Furthermore, each upper chord moment tube upper surface corresponds to two upper chord balls at different angles. Accurately locating the upper surface of each node ball is a challenging task.

[0003] The lofting of a crowned ball usually involves selecting three reference points on the spherical surface and projecting the reference points onto the ground on site to determine the direction of the flat surface of the ball. Although this technology can ensure the positioning of the ball, in a curved grid structure, the flat surfaces of adjacent balls are located on different normals, and the upper surfaces of the rectangular tubes between the balls are on another normal. The angle between the upper surfaces of the balls needs to be transitioned through the rectangular tubes. Using traditional technology, it is impossible to establish the entire concave hyperbolic surface model, and the on-site positioning technology of traditional technology is inefficient. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the present invention provides a BIM-based method for spatial positioning and installation of a hyperbolic grid crown ball.

[0006] The present invention provides a BIM-based method for spatial positioning and installation of a hyperbolic grid crown ball, comprising the following steps:

[0007] Position the crown ball in space, find the final center point of the node ball, and import the coordinates into the BIM model;

[0008] Establish a BIM model and conduct in-depth design of the joints and fulcrums of the welding balls and connectors to optimize the form of the welding balls;

[0009] Pre-processing the rods at the height difference position of the arc structure, wherein the torsion angle of each rod is obtained, and the orientation of the top surface of the truncated crown ball is obtained according to the torsion angle;

[0010] Compare data between digital processing BIM software and modeling software to ensure model accuracy and machinability;

[0011] The construction is carried out in blocks, wherein an adjustable assembly frame is set up in the assembly area, and after the assembly is completed, it is constructed by hoisting into place;

[0012] The main structure is detailed and laid out using Tekla, and other structures are precisely laid out to provide a theoretical data model of the positioning parameters of the structure and technical measures for subsequent on-site construction;

[0013] Assembled support frame design;

[0014] Based on the 3D laser scanning data collected on site, a 3D model is built using BIM software and compared with the in-depth BIM model;

[0015] Comprehensive analysis of hyperbolic grid structure based on BIM;

[0016] On-site installation of hyperbolic grid structure.

[0017] The BIM-based method for spatial positioning and installation of a hyperbolic grid crown-cutting ball according to the above technical solution of the present invention may also have the following additional technical features:

[0018] In the above technical solution, the specific steps of spatial positioning of the crown-cut ball are as follows:

[0019] Step 1: The center point of the cut crown ball can be preliminarily determined according to the intersection of the center lines of the components around the cut crown ball;

[0020] Step 2: Determine the tangent and normal of the building's outer contour at that location based on the preliminary center point;

[0021] Step 3: Move the center point of the chopped crown ball node along the normal direction so that the tangent line and the top surface of the chopped crown ball coincide in the same plane, and obtain the final center point of the chopped crown ball node.

[0022] In the above technical solution, the specific steps of pre-processing the rods at the height difference position of the arc structure are as follows:

[0023] Along the design structure edge, the roof panel controls the lower edge, and performs linear fitting on the position with shape;

[0024] The normal plane method is used to determine the torsion angle of each box member;

[0025] With the help of 3D CAD fitting model, the roof surface is scanned, the midpoint of each rod is found, and the normal line is drawn along the midpoint;

[0026] Finally, after determining the angles of the connected rods in the model, the orientation of the top surface of the truncated sphere is determined with the top surface of the upper chord moment tube of the truncated sphere as the reference.

[0027] In the above technical solution, after completing the digital processing BIM software and the comparison data of the modeling software, the welding ball processing is carried out, and the processing steps are as follows:

[0028] First, the spherical shell is processed according to the model, then the stiffening partition mounting seat is carried out, followed by the installation of the sphere, and the sphere weld is processed at the left rear.

[0029] In the above technical solution, during the block assembly construction process, the torsion value of the box-type rod needs to be marked on the cradle drawing in the plane direction and the vertical direction, and the linear shape of the box-type rod is controlled according to this value during on-site assembly.

[0030] In the above technical solution, the reference axis position, elevation and verticality deviation are checked at any time during the block assembly construction process. If it is found that the deviation is greater than the allowable deviation of the construction process, it is corrected in time.

[0031] In the above technical solution, during the block assembly construction process, BIM pre-assembly and three-dimensional simulation assembly are required, followed by on-site assembly and on-site installation.

[0032] In the above technical solution, the main structure is detailed as follows through Tekla deepening and lofting:

[0033] The main structure uses an Excel spreadsheet in the BIM platform to batch import node coordinates into Tekla through plug-ins to deepen and establish nodes, fit the axis of the grid rods, and then parametrically establish the hyperbolic concave grid outline based on the data provided by the design. The model is corrected by matching the design building model and deepened and laid out through Tekla.

[0034] In the above technical solution, the assembly support frame is specifically designed as follows:

[0035] The support frame structure adopts an independent lattice support frame. The support frame consists of 15m high units and their connecting rods to form an assembled system that is easy to install and disassemble. The nodes are connected by installing bolts. A detachable adjustment section and working platform are set on the top, and the lower part is supported on an independent foundation.

[0036] In the above technical solution, the comprehensive analysis of the hyperbolic grid structure based on BIM specifically includes the following steps:

[0037] In the BIM platform, construction feedback data is compared with the theoretical target true value of construction control prediction calculation and the corrected target true value of the real-time calculation results of construction monitoring and surveillance to determine the actual distribution state of the error and make timely adjustments to continuously distributed errors and large peak errors.

[0038] Use the parameter identification system on the BIM platform to identify and correct the calculation parameters. If a continuous distribution error state with a divergent trend appears during construction, this type of error is mostly caused by the distortion of the target true value caused by the distortion of the calculation parameters. Timely parameter identification, parameter correction or parameter fitting should be carried out to provide a reasonable target true value. The cause of the parameter distortion should be carefully analyzed so that it can be controlled during construction.

[0039] According to the specific conditions of the structure, the allowable error value of the axis deviation during construction is determined to be ±5mm, the allowable error value of the structural elevation is ±5mm, and the allowable error value of the butt joint misalignment is ±3mm;

[0040] After parameter adjustment and fitting in the BIM platform, the actual construction time parameters and actual construction displacement parameters are used to monitor the construction and generate the actual target true value of the construction control, which is used for the next stage of structural elevation determination and error analysis.

[0041] The BIM-based method for spatial positioning and installation of a hyperbolic grid crowned ball proposed in this invention has the following beneficial effects compared to the prior art:

[0042] The present invention can simultaneously meet the requirements that the upper surfaces of the upper chord moment tubes in four different angles are flush with the upper surfaces of the truncated crown node balls, and one upper surface of the upper chord moment tube corresponds to two upper chord balls at different angles, and the upper plane of the truncated crown of a node ball is flush with the upper surfaces of the upper chord moment tubes in four directions, thereby ensuring the flatness and installation accuracy of the top surface of the truss.

[0043] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0045] Figure 1 This is one of the schematic diagrams of the spatial positioning of the truncated ball in the BIM-based hyperbolic grid truncated ball spatial positioning and installation method of the present invention;

[0046] Figure 2 This is the second schematic diagram of the spatial positioning of the truncated ball in the BIM-based hyperbolic grid truncated ball spatial positioning and installation method of the present invention;

[0047] Figure 3 This is the third schematic diagram of the spatial positioning of the truncated crown ball in the BIM-based hyperbolic grid truncated crown ball spatial positioning and installation method of the present invention;

[0048] Figure 4 This is the form of the welded ball before optimization;

[0049] Figure 5 It is an optimized solder ball form;

[0050] Figure 6 This is one of the schematic diagrams of the pre-processing of rods in the BIM-based method for spatial positioning and installation of a hyperbolic truss crown;

[0051] Figure 7 This is the second schematic diagram of the pre-processing of rods in the BIM-based method for spatial positioning and installation of a hyperbolic truss crowned ball of the present invention;

[0052] Figure 8 This is a schematic diagram of the torsion angle fitting of the rods in the BIM-based method for spatial positioning and installation of a hyperbolic truss crowned ball;

[0053] Figure 9 It is a schematic diagram of the torsion value marking of the box-type rod in the BIM-based hyperbolic grid crown-cutting ball spatial positioning and installation method of the present invention. DETAILED DESCRIPTION

[0054] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0055] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0056] Refer to the following Figures 1 to 9 The following describes a BIM-based method for spatial positioning and installation of a hyperbolic truss crown ball according to some embodiments of the present invention.

[0057] The embodiment of the present invention proposes a BIM-based method for spatial positioning and installation of a hyperbolic grid crown ball, comprising the following steps:

[0058] 1. Spatial positioning of the chip shot

[0059] The height of the crowned ball node is usually determined by the design unit based on calculations. However, its position in the grid needs to be determined by the following method:

[0060] Step 1: The center point of the cut crown ball can be preliminarily determined according to the intersection of the center lines of the components around the cut crown ball, such as Figure 1 shown.

[0061] Step 2: Determine the tangent and normal of the building's outer contour at that location based on the preliminary center point, such as Figure 2 shown.

[0062] Step 3: Move the center point of the truncated crown ball node along the normal direction so that the tangent line and the top surface of the truncated crown ball coincide in the same plane, and obtain the final center point of the truncated crown ball node, as shown in the figure below: Figure 3 shown.

[0063] 2. Through the establishment of BIM model, the welding balls, connectors and other nodes such as intersections and fulcrums are designed in depth. The form of the welding balls before optimization is as follows: Figure 4 As shown, the optimized solder ball form is as follows Figure 5 As shown, it is convenient to better complete the welding of the internal stiffening ribs during processing and production. At the same time, the weld of sample A is not only a spherical semi-butt weld, but also a welding weld of the stiffening ribs, so one seam can be used for multiple purposes.

[0064] 3. Pre-processing of rods is required at the height difference position of the arc. Along the edge of the design structure, the roof panel controls the lower edge, and linear fitting is performed on the position with the shape, such as Figure 6 and Figure 7 shown.

[0065] The roof chords are box-shaped members. Based on the curved roof surface, we can tell that the box-shaped members are not perpendicular to the ground, but are approximately parallel to the roof surface, forming varying angles with the ground. This requires finding the torsion angle of each box-shaped member.

[0066] After technical analysis and comparison, it was finally decided to use the normal line and normal plane method to determine the torsion angle of each box-type member. With the help of 3D CAD fitting model, the roof surface was scanned, the midpoint of each member was found, and the normal line was drawn along the midpoint, such as Figure 8 shown.

[0067] Finally, after determining the angles of the connected rods in the model, the orientation of the top surface of the truncated sphere is determined with the top surface of the upper chord moment tube of the truncated sphere as the reference.

[0068] 4. Compare data between digital processing BIM software and modeling software to ensure model accuracy and machinability.

[0069] 5. Accurate positioning and block assembly construction

[0070] The assembly unit modules are assembled by setting up an adjustable assembly cradle in the assembly area, and are hoisted into place after assembly is completed.

[0071] Mark the torsion value of the box-type member on the frame drawing through the plane and elevation. During on-site assembly, the line shape of the box-type member is controlled according to this value, such as Figure 9 shown.

[0072] During the assembly process, check the reference axis position, elevation and verticality deviation at any time; if it is found that the deviation is greater than the allowable deviation of the construction process, correct it in time.

[0073] During the assembly process, BIM pre-assembly and three-dimensional simulation assembly are required, followed by on-site assembly and on-site installation.

[0074] Among them, in the on-site assembly and production, since the inclination angle of each node ball is different, it is necessary to accurately locate the assembly position and angle of each node ball based on the model construction, and to calibrate the connection of the chord members. After the grid assembly is completed, the position, inclination, splint angle and welds of the key control points of the grid are checked again and marked as qualified. At the same time, according to the needs of lifting and monitoring, positioning observation marks are set at the lowest point of the welded ball and the center point of the crown cutting surface. In order to avoid the influence of the angle, even if the instrument observation angle is adjusted, it still cannot meet the monitoring data collection needs. In the lower half of the ball, a 200mm diameter ring is printed with a circumferential mark and a distinguishing mark.

[0075] 6. Parametric overall modeling of structures and measures

[0076] The main structure is imported into Tekla in batches through the plug-in using Excel spreadsheets in the BIM platform to deepen the node coordinates, establish nodes, and fit the axis of the grid rods. Then, the hyperbolic concave grid outline is parameterized based on the data provided by the design. The model is corrected by matching the design building model and deepened and laid out through Tekla.

[0077] While processing the process details of the three-dimensional structural model, the construction technical measures, such as supporting structures and working platforms, are integrated into the model to achieve accurate layout of the structure and technical measures, providing a theoretical data model of the positioning parameters of the structure and technical measures for subsequent on-site construction.

[0078] 7. Assembled support frame design

[0079] The support frame structure adopts an independent lattice support frame. The support frame consists of 15m high units and their connecting rods to form an assembled system that is easy to install and disassemble. The nodes are connected by installing bolts. A detachable adjustment section and working platform are set on the top, and the lower part is supported on an independent foundation.

[0080] Midas structural design software was used to calculate and analyze the support frame. Taking a 15m-high support frame as an example, the design structural importance factor was set to 1. In addition to the dead load, the reaction force was extracted by adding support points to the original design model and applied as a point load to the top support point of the support frame. The load combination considered was 1.30 dead load + 1.50 live load. Through calculation and analysis of the support system, the support frame foundation reaction force was extracted, and the bearing capacity of the soil layer under the support frame was calculated. An independent foundation was installed at the bottom of the support frame. The foundation size and thickness were calculated based on the reaction force and support frame specifications.

[0081] 8. 3D scanning information control

[0082] Based on the 3D laser scanning data collected on site, a 3D model was established using BIM software and compared with the in-depth BIM model.

[0083] 7. Information control of grid construction process

[0084] (1) Application of information technology

[0085] The core of the combination of information technology and construction includes three parts: first, establishing a parametric model in the BIM platform to obtain the original data model of the structure, and recording the virtual pre-assembly data after the grid is processed and manufactured; second, using the finite element software carried by BIM to analyze the monitoring object based on time-varying mechanics during construction to obtain the expected value and target value of the structural performance; third, comparing the measured data analysis and simulation calculations, correcting the model and controlling the on-site construction. During the simulation analysis, calculation, error analysis, and optimization and adjustment of the installation parameters of each segment are the core work content of the control. Through real-time simulation of the entire process of structural construction, combined with the identification, correction of various design parameters and analysis and evaluation of other measurement data, the theoretical calculation values ​​of the construction control parameters of each construction stage are obtained, construction control instructions are formed, and real-time predictions are made for the structural status of each construction stage, thereby achieving the ultimate goal of implementing soft control of structural construction. The specific operations are as follows:

[0086] a. In the BIM platform, the construction feedback data is compared with the theoretical target true value of the construction control prediction calculation and the corrected target true value of the real-time calculation results of construction monitoring and surveillance to determine the actual distribution state of the error and make timely adjustments to the continuously distributed error and large peak error.

[0087] b. Use the parameter identification system on the BIM platform to identify and correct calculated parameters. If a continuously distributed error state with a divergent trend occurs during construction, this error is mostly caused by distortion of the target true value caused by distortion of the calculated parameters. Timely parameter identification, parameter correction, or parameter fitting should be performed to provide a reasonable target true value. Carefully analyze the causes of parameter distortion so that they can be controlled during construction.

[0088] c. Based on the specific conditions of the structure, the allowable deviation of the axis during construction is set at ±5mm, the allowable deviation of the structural elevation is ±5mm, and the allowable deviation of the joint misalignment is ±3mm. The structural stress test results, including the incremental results, are used as stress warning parameters for construction. Abnormal stress changes during the test are monitored and timely warning reports are issued.

[0089] d. After parameter adjustment and fitting in the BIM platform, the actual construction time parameters and actual construction displacement parameters are used to monitor the construction and generate the actual target true value of the construction control, which is used for the next stage of structural elevation determination and error analysis.

[0090] 8. On-site installation of hyperbolic grid structure

[0091] (1) For the ground segmented hoisting construction, in addition to re-measurement of the support points before hoisting, it is necessary to measure the control points of the installed frame. The measurement data is analyzed through the model, and the hoisting partitions are assembled on the ground assembly frame, and the structural installation posture is adjusted. When each partition is hoisted, the installation positioning is controlled by the original model coordinates to avoid the accumulation of deviations.

[0092] During on-site assembly and production, since the inclination angles of each node ball are different, it is necessary to accurately locate the assembly position and angle of each node ball based on the model construction, and to calibrate the connection of the chord members.

[0093] (2) The subsequent block hoisting shall be started in sequence according to the predetermined order, and the measurement data shall be analyzed and the positioning and deviation correction shall be carried out. According to the calculation and analysis results of the support frame, pre-biasing measures shall be taken before the structure with a support point displacement greater than 10 mm is put into place to avoid deformation of the support frame affecting the installation accuracy.

[0094] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples.

[0095] Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A BIM-based method for spatial positioning and installation of a hyperbolic truss crown ball, characterized in that: The steps include: Position the crown ball in space, find the final center point of the node ball, and import the coordinates into the BIM model; Establish a BIM model and conduct in-depth design of the joints and fulcrums of the welding balls and connectors to optimize the form of the welding balls; Pre-processing the rods at the height difference position of the arc structure, wherein the torsion angle of each rod is obtained, and the orientation of the top surface of the truncated crown ball is obtained according to the torsion angle; Compare data between digital processing BIM software and modeling software to ensure model accuracy and machinability; The construction is carried out in blocks, wherein an adjustable assembly frame is set up in the assembly area, and after the assembly is completed, it is constructed by hoisting into place; The main structure is detailed and laid out using Tekla, and other structures are precisely laid out to provide a theoretical data model of the positioning parameters of the structure and technical measures for subsequent on-site construction; Assembled support frame design; Based on the 3D laser scanning data collected on site, a 3D model is built using BIM software and compared with the in-depth BIM model; Comprehensive analysis of hyperbolic grid structure based on BIM; On-site installation of hyperbolic grid structure; The specific steps of the spatial positioning of the crown-cutting ball are as follows: Step 1: The center point of the cut crown ball is preliminarily determined according to the intersection of the center lines of the components around the cut crown ball; Step 2: Determine the tangent and normal lines of the building's outer contour at that location based on the preliminary center point; Step 3: Move the center point of the truncated spherical node along the normal direction so that the tangent line and the top surface of the truncated spherical node coincide in the same plane, thereby obtaining the final center point of the truncated spherical node. The specific steps of pre-processing the rod at the height difference position of the arc structure are as follows: Along the design structure edge, the roof panel controls the lower edge, and performs linear fitting on the position with shape; The normal plane method is used to determine the torsion angle of each box member; With the help of 3D CAD fitting model, the roof surface is scanned, the midpoint of each rod is found, and the normal line is drawn along the midpoint; Finally, after determining the angles of the connected members in the model, the orientation of the top surface of the truncated sphere is determined based on the top surface of the upper chord moment tube of the truncated sphere. After completing the digital processing BIM software and the comparison data of the modeling software, the welding ball is processed. The processing steps are as follows: First, the spherical shell is processed according to the model, then the stiffening partition mounting seat is carried out, and then the sphere is installed, and the sphere weld is processed at the left rear; During the block assembly construction process, the torsion value of the box-type member needs to be marked on the frame drawing in the plane and elevation directions, and the line shape of the box-type member is controlled based on this value during on-site assembly.

2. The BIM-based method for spatial positioning and installation of a hyperbolic grid crown-cutting ball according to claim 1 is characterized in that: During the block assembly construction process, check the reference axis position, elevation and verticality deviation at any time. If it is found that the deviation is greater than the allowable deviation of the construction process, correct it in time.

3. The BIM-based method for spatial positioning and installation of a hyperbolic grid crown-cutting ball according to claim 2 is characterized in that: During the block assembly construction process, BIM pre-assembly and three-dimensional simulation assembly are required, followed by on-site assembly and on-site installation.

4. The BIM-based method for spatial positioning and installation of a hyperbolic grid crown-cutting ball according to claim 3 is characterized in that: The main structure is detailed through tekla deepening and lofting as follows: The main structure uses an Excel spreadsheet in the BIM platform to batch import node coordinates into Tekla through plug-ins to deepen and establish nodes, fit the axis of the grid rods, and then parametrically establish the hyperbolic concave grid outline based on the data provided by the design. The model is corrected by matching the design building model and deepened and laid out through Tekla.

5. The BIM-based method for spatial positioning and installation of a hyperbolic grid crown-cutting ball according to claim 4 is characterized in that: The assembled support frame is specifically designed as follows: The support frame structure adopts an independent lattice support frame. The support frame consists of 15m high units and their connecting rods to form an assembled system that is easy to install and disassemble. The nodes are connected by installing bolts. A detachable adjustment section and working platform are set on the top, and the lower part is supported on an independent foundation.

6. The BIM-based method for spatial positioning and installation of a hyperbolic truss crown-cutting ball according to claim 5 is characterized in that: The comprehensive analysis of the hyperbolic grid structure based on BIM specifically includes the following steps: In the BIM platform, construction feedback data is compared with the theoretical target true value of construction control prediction calculation and the corrected target true value of the real-time calculation results of construction monitoring and surveillance to determine the actual distribution state of the error and make timely adjustments to continuously distributed errors and large peak errors. Use the parameter identification system on the BIM platform to identify and correct the calculation parameters. If a continuous distribution error state with a divergent trend appears during construction, this type of error is mostly caused by the distortion of the target true value caused by the distortion of the calculation parameters. Timely parameter identification, parameter correction or parameter fitting should be carried out to provide a reasonable target true value. The cause of the parameter distortion should be carefully analyzed so that it can be controlled during construction. According to the specific conditions of the structure, the allowable error value of the axis deviation during construction is determined to be ±5mm, the allowable error value of the structural elevation is ±5mm, and the allowable error value of the butt joint misalignment is ±3mm; After parameter adjustment and fitting in the BIM platform, the actual construction time parameters and actual construction displacement parameters are used to monitor the construction and generate the actual target true value of the construction control, which is used for the next stage of structural elevation determination and error analysis.

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