CN112380602B - High-precision construction method for space curved surface reticulated shell in limited environment - Google Patents
High-precision construction method for space curved surface reticulated shell in limited environment Download PDFInfo
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Abstract
The invention relates to a high-precision construction method of a space curved-surface reticulated shell in a limited environment, which comprises the following steps: acquiring a refined existing building three-dimensional BIM model; preliminary selecting a net shell rod piece; detecting the mold closing of the net shell mold; pre-deforming the net shell model; and (5) deep design of the through hole. The invention can effectively improve the construction precision of the net shell, the field installation speed of the net shell and the comprehensive construction benefit.
Description
Technical Field
The invention belongs to the technical field of steel structure installation, and particularly relates to a high-precision construction method of a space curved-surface reticulated shell in a limited environment.
Background
At present, space reticulated shell structures are unprecedented applied and developed at home and abroad, wherein the space curved surface single-layer reticulated shell structure has wide application space due to the advantages of beautiful appearance, reasonable stress, high stability, material saving, applicability to large spans and the like, and is frequently used in building structures at present, particularly in space environments such as halls, indoor and the like.
In practice, the structure is generally arranged in a building structure and depends on a main body structure, the net shell structure construction can be started after the main body structure construction is completed, large-sized machines such as a tower crane and the like are often removed, the crane and the like are difficult to enter the room for operation, and a large number of subsequent operation engineering is developed, so the structure is often positioned on a key line of the construction, and the requirement on the construction period is very high.
The space curved surface single-net-shell structure has the advantages of large number of rod pieces, large size specification difference, thin pipe wall, weak out-of-plane rigidity and complex space intersecting node structure, and particularly has high requirements on the arrangement, layout, appearance forming quality and precision of the pipe pieces for the net-shell structure with the rod pieces exposed.
Meanwhile, due to the fact that construction errors are unavoidable in civil engineering construction, when construction is carried out according to an original reticulated shell design, the problems that subsequent pipe fittings collide with an existing building or are misplaced and the like often occur, rod pieces are difficult to mount smoothly, and reworking and a large amount of waste are caused.
In summary, the limited environment is limited by the constraint conditions such as the working space and the hoisting machinery, and the modularized high-precision operation method is difficult to adopt, and the comprehensive factors such as the forming precision, the construction speed, the construction quality and the like must be considered in the construction of the net shell, so that the construction of the structure has great challenges.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-precision construction method for a space curved-surface reticulated shell in a limited environment, which can effectively improve the construction precision of the reticulated shell, the field installation speed of the reticulated shell and the construction comprehensive benefit.
The technical scheme adopted by the invention for solving the technical problems is to provide a high-precision construction method of a space curved-surface reticulated shell in a limited environment, which comprises the following steps:
step 1: obtaining a refined existing building three-dimensional BIM model
1) Building a three-dimensional BIM model M of the existing building according to a design drawing 0 ；
2) Scanning the existing building by using a space three-dimensional scanning technology to form a scanning three-dimensional model M of the existing building R ；
3) Will sweepDrawing three-dimensional model M R Existing building three-dimensional BIM model M 0 Introducing a BIM mold closing platform to perform mold closing correction to form a corrected three-dimensional BIM model M of the existing building C ；
Step 2: preliminary selection of net shell rod pieces
1) Determining topological relation and node coordinate X of net shell according to building modeling requirements 0 And according to X 0 Line model M for establishing net shell by topological relation SL ；
2) Comprehensively considering the factors of beautiful building modeling and convenient pipe fitting processing, and primarily selecting the net shell rod pieces;
3) According to the preliminary selection of the rod piece, the boundary condition of the net shell and the construction factors of the connecting nodes, the method is characterized in that SL Building a net shell finite element model M on the basis of the model SF The structure is subjected to stress analysis, the rod member shape selection is adjusted according to the stress requirement, and the finite element model M of the net shell after the shape selection adjustment is obtained SF0 ；
Step 3: net shell mold closing detection
Finite element model M SF0 After being converted into a file format of a mold closing platform, the file is imported into the mold closing platform for the finite element model M SF0 And (3) die assembly correction, namely adjusting the spatial positioning of the rod pieces, ensuring that all the rod pieces do not collide with the existing building, and obtaining a net shell finite element model M after die assembly adjustment SFC0 Space coordinate X of net shell node after die assembly adjustment C0 ；
Step 4: net shell model pre-deformation
1) Net shell finite element model M after adjusting involution model SFC0 Performing morphological calculation analysis to obtain node coordinates X after the deformation of the reticulated shell d0 And X is C0 Difference d of space node coordinates 0 I.e. d 0 ＝X d0 －X C0 ；
2) Will deform the value d 0 Inverse superimposed to node coordinate X C0 Obtaining updated coordinate X C1 The method comprises the following steps: x is X C1 ＝X C0 －f×d 0 F is a coordinate adjustment superposition coefficient, and is determined according to experience and a structural form;
3) According to the moreNew coordinates X C1 Updating finite element model M SFC0 Obtaining M SFC1 For M SFC1 Calculating and analyzing to obtain node coordinates X after the deformation of the latticed shell structure after the coordinate updating d1 And X is C0 Difference d of space node coordinates 1 I.e. d 1 ＝X d1 －X C0 ；
4) Obtaining the deformation value d of the net shell node after updating the coordinates 1 Node deformation value d with maximum absolute value max The method comprises the following steps: d, d max ＝max{|d 1 I, judge d max ≤f S X D, wherein: d is the maximum allowable value required by the relevant national regulations, f S The integral precision coefficient can be determined according to the structural form and the precision requirement; if the condition is satisfied, the calculation is terminated, if not, the process returns to step 2), d) 1 Substitute d 0 ，X C1 Substitute X C0 Recalculate until d is satisfied max ≤f S X D, obtaining the pre-deformed net shell finite element model M SFCP ；
Step 5: deep design of through hole
1) Will M SFCP After the model is converted into a file format identified by the deepened design software, leading in professional deepened software;
2) At the satisfaction of M SFCP Based on the stress condition calculated by the model, the assembly and welding sequence of the construction site in the limited environment of the net shell is fully combined, the deepening design of the through hole of the net shell is carried out, the deepening of the through hole is to be carried out with priority for the on-site assembly and welding operation, the problem that the hidden welding line is inconvenient to weld is avoided, and meanwhile, the problem that the subsequent rod piece cannot be normally installed due to the existence of the through hole is avoided;
3) And (5) blanking the latticed shell component according to the model with the deepened through holes.
In the step 1, a scanning three-dimensional model M of the existing building is formed R And meanwhile, the on-site actual measurement results are fully combined and mutually corrected, so that the model space coordinate precision of the actual existing building is ensured.
When the net shell rod piece is subjected to preliminary model selection in the step 2, on the basis of meeting the requirement of beautiful building modeling, the pipe fittings with consistent outer diameters and similar specifications are selected as far as possible, and when partial pipe fittings are stressed greatly, the problem can be solved by adjusting the wall thickness of the pipe fittings.
The finite element model M is used in the step 3 SF0 When the finite element software is converted into the file format of the mold closing platform, and the finite element software does not have the output file format identified by the mold closing platform, a third party software or programming mode is adopted to convert the finite element model into the file format identified by the mold closing platform.
When the pre-deformation of the reticulated shell model is analyzed in the step 4, when the analysis times are more and difficult to converge, the area affecting convergence should be analyzed, and after the coordinate adjustment superposition coefficient f of the area is adjusted to be smaller, the calculation is performed again.
When the installation convenience and the implementation convenience of the hidden weld joint of the pipe fitting in the step 5 cannot be met at the same time, adopting an eccentric node design scheme, wherein the eccentric design meets the standard requirement; when the eccentric node scheme is still not satisfied at the same time, a non-eccentric node scheme is selected, and the implementation of the hidden weld joint is preferentially satisfied.
Advantageous effects
Firstly, the accurate space actual coordinates of the existing building can be effectively obtained through the pre-three-dimensional scanning and measurement, an important basis is provided for the establishment of the net shell high-precision model, meanwhile, the method can adapt to complex and changeable building shapes, meets the construction conditions in a limited environment, and is high in adaptability.
Secondly, the invention corrects the BIM die assembly of the reticulated shell model and the existing building, so that the problems of material waste, reworking and the like in the subsequent construction process can be effectively avoided, the construction efficiency is greatly improved, and the cost is saved.
Thirdly, through the design of the pre-deformation of the net shell, the influence of the deformation of the net shell on the formation of the net shell is considered in advance, the space positioning precision of the net shell is improved, the space coordinates of the construction structure are highly matched with the space of the design coordinates, and the precision of the net shell is further improved.
Fourth, the invention fully combines the assembling and welding sequences of the net shell when the net shell pipe fitting is deeply designed, and the problem that the hidden welding seam is difficult to weld and the subsequent pipe fitting is difficult to install is avoided to the greatest extent.
Fifthly, the multi-software BIM cooperative work technology is adopted, so that the precision and efficiency of key links such as engagement of the net shell and the existing building, stress analysis of the net shell, design of net shell through holes and the like are greatly improved, and the comprehensive design benefit of the net shell is further improved.
Drawings
Fig. 1 is a line model diagram of a single-layer reticulated shell structure with a space hyperboloid according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a lower arc portion of a space hyperboloid single-layer reticulated shell structure according to an embodiment of the present invention.
Fig. 3 is a schematic view illustrating disassembly of a through hole in a circular arc portion of a lower portion of a space hyperboloid single-layer reticulated shell structure according to an embodiment of the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
For a library project, the total building area is about 54289m 2 Consists of a main building, a subsidiary building, a sinking square, a basement and other auxiliary facilities. The high-permeability glass curtain wall of the atrium of the building design is positioned in a main building hall, the lower part of the high-permeability glass curtain wall is an arc-shaped curved surface and is connected with each floor of building through an elevator corridor channel, the upper part of the high-permeability glass curtain wall is a hyperboloid and is connected with an oval roof of a top layer, the high-permeability glass curtain wall is in a funnel shape in space, the whole curtain wall is supported by a single-layer net shell, and the indoor and outdoor sides of the whole atrium are integrated into a whole. Before the net shell is constructed, the main structure is finished, the built buildings are arranged around the net shell, the operation is an indoor limited space, and the site operation conditions are limited.
1) Building a three-dimensional Autodesk Revit model M of the existing building according to a design drawing 0 。
2) Scanning the existing building by using a space three-dimensional scanning technology to form a scanning three-dimensional model M of the existing building R 。
3) The three-dimensional model M will be scanned R Existing building three-dimensional Autodesk Revit model M 0 Introducing an Autodesk Revit mould closing platform, and fully combining with the on-site actual measurement result to perform mould closing correction to form a three-dimensional Autodesk Revit model M after the correction of the existing building C 。
1) Determining topological relation and node coordinate X of net shell according to building modeling requirements 0 And according to X 0 Line model M for establishing net shell by topological relation SL As shown in fig. 1.
2) Comprehensively consider factors such as architectural modeling is graceful, pipe fitting processing is convenient, carry out preliminary type selection to the net shell member, on satisfying architectural modeling graceful basis, select the pipe fitting that the pipe fitting external diameter is unanimous as far as possible, the specification is close to be convenient for processing and manufacturing, the pipe fitting is tubular mutually of being convenient for, when partial pipe fitting atress is great, can solve through the mode of adjusting the pipe fitting wall thickness, the final selection steel adopts Q345B, the pipe fitting cross section adopts phi 152mm×5mm, phi 152mm×8mm, roof oval support cross section adopts rectangular pipe 300mm×300mm×16mm.
3) According to the factors of the preliminary selection of the rod piece, the boundary condition of the net shell, the structure of the connecting node and the like, the method is characterized in that SL Building a net shell MIDAS Gen finite element model M on the basis of the model SF The structure is subjected to stress analysis, the rod member is selected and regulated according to the stress requirement, and the MIDAS Gen finite element model M of the net shell after the selected and regulated is obtained SF0 。
MIDAS Gen finite element model M SF0 Converting into an IFC standard format file, importing an Autodesk Revit mould closing platform, and performing an MIDAS Gen finite element model M SF0 Die assembly correction, rod piece space positioning adjustment, no collision between all rod pieces and the existing building is ensured, and a net shell MIDAS Gen finite element model M after die assembly adjustment in MGT file format is output SFC0 After die assembly adjustmentSpace coordinate X of net shell node C0 。
1) Die-assembled and adjusted net shell MIDAS Gen finite element model M SFC0 Performing morphological calculation analysis to obtain node coordinates X after the deformation of the reticulated shell d0 And X is C0 Difference d of space node coordinates 0 I.e. d 0 ＝X d0 －X C0 。
2) Will deform the value d 0 Inverse superimposed to node coordinate X C0 Obtaining updated coordinate X C1 The method comprises the following steps: x is X C1 ＝X C0 －f×d 0 F is a coordinate adjustment superposition coefficient, taking f=1.1.
3) According to the updated coordinates X C1 Updating MIDAS Gen finite element model M SFC0 Obtaining M SFC1 For M SFC1 Calculating and analyzing to obtain node coordinates X after deformation of the latticed shell nodes after coordinate updating d1 And X is C0 Difference d of space node coordinates 1 I.e. d 1 ＝X d1 －X C0 。
4) Obtaining the deformation value d of the net shell node after updating the coordinates 1 Node deformation value d with maximum absolute value max ＝max{|d 1 I = 15.5mm, consulting the national relevant specifications and determining a deflection maximum allowable value D = 26mm according to the structural size of the net shell, taking the value f into consideration of the follow-up glass curtain wall installation precision control S =0.4, then d max ＝15.5mm＞ f S ×D＝0.4×26mm＝10.4mm。
If the condition is not satisfied, returning to step 2, using d 1 Substitute d 0 ，X C1 Substitute X C0 Re-calculating, wherein the second calculation result is d max =5.8 mm < 10.4mm, meeting the requirements, obtaining the pre-deformed reticulated shell MIDAS Gen finite element model M SFCP 。
Step 5, deep design of through hole
1) Will M SFCP The model is exported in IFC format, and specialized deep software Tekla Structures is imported.
2) At the satisfaction of M SFCP Model-calculated basis of stress conditionsOn the basis, the assembly and welding sequence of the construction site under the limited environment of the reticulated shell is fully combined, and the deep design of the through hole of the reticulated shell is carried out. The deepening of the through hole is to be prioritized for on-site assembly and welding operation, so that the problem that the hidden welding line is inconvenient to weld is avoided as much as possible, and meanwhile, the problem that the subsequent rod piece cannot be normally installed due to the existence of the through hole is avoided as much as possible.
Taking the design of a circular arc-shaped net shell through hole at the lower part of the net shell as an example, every two layers of net shells of the circular arc-shaped net shell are a truss unit, an upper annular pipe, a middle annular pipe and a lower annular pipe are arranged, an inclined web member between the upper annular pipe and the lower annular pipe is a straight rod, as shown in fig. 2, 1 is a bottom annular pipe, 2 is an upper annular pipe, 3 is a middle annular pipe, 4 is a reverse inclined web member, and 5 is a forward inclined web member.
From the analysis of the precision control of construction, the space coordinate control of the annular pipe fitting is the key point of the precision control. If the lower web member is firstly installed, a large number of temporary cantilever members are formed, and a small error in construction causes larger displacement deviation of the space coordinates of the cantilever end, so that the space coordinate precision of the upper annular pipe fitting is difficult to ensure; if the upper annular pipe fitting is positioned and installed at first to form a stable space annular shape, and then the web member is installed by determining a straight line by two points, the positioning precision of each space point can be effectively ensured. Thus, there is an advantage in terms of installation accuracy control in maintaining the annular tube penetration. The positioning of the middle annular pipe fitting can be easily realized, but if the middle annular pipe fitting is firstly installed from the middle to the middle, the accuracy control of the middle annular pipe fitting is not facilitated, so that the annular pipe fitting at the middle of each pipe fitting is not suitable to be communicated.
From the analysis of the stress characteristics of the reticulated shell, the vertical rod of the lower reticulated shell is a compression member, and the horizontal rod is a tension rod, so that the tension annular rod is maintained to be communicated, and the compression vertical rod is disconnected.
From the analysis of the assembly sequence, firstly assembling the annular pipe fittings, then starting from one end of a truss, assembling the waist horizontal rod pieces and the inclined rod pieces successively, so that the assembly of all the rod pieces of the truss can be realized, and the welding of all welding seams can be realized.
In a review analysis, the design scheme of the lower circular arc-shaped through hole can be determined as follows: the upper and lower end annular pipe fittings 1 and 2 are integrally communicated; the reverse diagonal web member 4 is communicated in each truss, and the upper end and the lower end are respectively communicated with the upper annular pipe fitting 1 and the lower annular pipe fitting 2; the middle annular pipe fitting 3 is disconnected at the junction with the reverse inclined web member 4 and is communicated with the reverse inclined web member; the forward inclined web member 5 is disconnected at the intersection point, and two ends of the forward inclined web member are respectively communicated with the intersection point of the upper and lower annular pipe members 1 and 2 and the reverse inclined web member 4 and the intersection point of the middle annular pipe member 3 and the reverse inclined web member 4, as shown in fig. 3. Meanwhile, an entity finite element model of the relevant node is established for simulation checking calculation, and the stress of the node is ensured to meet the requirement.
3) And (5) blanking the latticed shell component according to the model with the deepened through holes.
Claims (5)
1. A high-precision construction method of a space curved-surface reticulated shell in a limited environment comprises the following steps:
step 1: obtaining a refined existing building three-dimensional BIM model
1) Building a three-dimensional BIM model of the existing building according to the design drawingM 0 ；
2) Scanning the existing building by using a space three-dimensional scanning technology to form a scanning three-dimensional model of the existing buildingM R ；
3) The three-dimensional model will be scannedM R Existing building three-dimensional BIM modelM 0 Introducing a BIM mold closing platform to perform mold closing correction to form a corrected three-dimensional BIM model of the existing buildingM C ；
Step 2: preliminary selection of net shell rod pieces
1) Determining topological relation and node coordinates of net shells according to building modeling requirementsX 0 And according toX 0 Line model for establishing net shell by topological relationM SL ；
2) Comprehensively considering the factors of beautiful building modeling and convenient pipe fitting processing, and primarily selecting the net shell rod pieces;
3) According to the preliminary selection of the rod piece, the boundary condition of the net shell and the construction factors of the connecting nodes, the method is as followsM SL Building a net shell finite element model based on the modelM SF Analyzing the stress of the structure, and adjusting the preliminary selection of the rod piece according to the stress requirement to obtainFinite element model of net shell after selective adjustmentM SF0 ；
Step 3: net shell mold closing detection
Modeling finite elementM SF0 After being converted into a file format of a mold closing platform, the file format is imported into the mold closing platform for a finite element modelM SF0 And (3) die assembly correction, namely adjusting the spatial positioning of the rod pieces, ensuring that all the rod pieces do not collide with the existing building, and obtaining a net shell finite element model after die assembly adjustmentM SFC0 Space coordinates of net shell nodes after die assembly adjustmentX C0 ；
Step 4: net shell model pre-deformation
1) Net shell finite element model after adjusting involution mouldM SFC0 Performing morphological calculation analysis to obtain node coordinates after the deformation of the reticulated shellX d0 And (3) withX C0 Difference in spatial node coordinatesd 0 I.e.d 0 =X d0 －X C0 ；
2) Will deform the valued 0 Inverse superimposed to node coordinatesX C0 Obtaining updated coordinatesX C1 The method comprises the following steps:X C1 =X C0 －f×d 0 ，fthe superposition coefficient is adjusted for the coordinates, and the superposition coefficient is determined according to experience and structural form;
3) According to the updated coordinatesX C1 Updating finite element modelsM SFC0 ObtainingM SFC1 For a pair ofM SFC1 Calculating and analyzing to obtain node coordinates after the deformation of the latticed shell structure after the coordinates are updatedX d1 And (3) withX C0 Difference in spatial node coordinatesd 1 I.e.d 1 =X d1 －X C0 ；
4) Obtaining the deformation value of the net shell node after updating the coordinatesd 1 Node deformation value with maximum absolute valued max The method comprises the following steps:d max =max{|d 1 i, judged max ≤f S ×D，Wherein:Dis required by relevant national regulationsThe maximum allowable value of the current value,f S the integral precision coefficient can be determined according to the structural form and the precision requirement; terminating the calculation if the condition is satisfied, and returning to step 2) if the condition is not satisfied, usingd 1 Substitution ofd 0 ，X C1 Substitution ofX C0 Recalculate until it meetsd max ≤f S ×DObtaining a pre-deformed net shell finite element modelM SFCP ；
Step 5: deep design of through hole
1) Will beM SFCP After the model is converted into a file format identified by the deepened design software, leading in professional deepened software;
2) Is satisfied thatM SFCP On the basis of the stress condition calculated by the model, the deep design of the through hole of the net shell is carried out by combining the assembly and welding sequence of the construction site in the limited environment of the net shell, so that the on-site assembly and welding operation is facilitated, the problem that the hidden welding seam is inconvenient to weld is avoided, and meanwhile, the problem that the subsequent rod cannot be normally installed due to the existence of the through hole is avoided;
3) And (5) blanking the latticed shell component according to the model with the deepened through holes.
2. The method for constructing the space curved net shell with high precision under the limited environment according to claim 1, wherein the method comprises the following steps: the step 1 is to form a scanning three-dimensional model of the existing buildingM R And meanwhile, the on-site actual measurement results are fully combined and mutually corrected, so that the model space coordinate precision of the actual existing building is ensured.
3. The method for constructing the space curved net shell with high precision under the limited environment according to claim 1, wherein the method comprises the following steps: the finite element model is used in the step 3M SF0 When the finite element software is converted into the file format of the mold closing platform, and the finite element software does not have the output file format identified by the mold closing platform, a third party software or programming mode is adopted to convert the finite element model into the file format identified by the mold closing platform.
4. The method for constructing the space curved net shell with high precision under the limited environment according to claim 1, wherein the method comprises the following steps: when analyzing the pre-deformation of the net shell model in the step 4, when the analysis times are more and difficult to converge, the area affecting convergence should be analyzed, and the coordinates of the area should be adjusted to the superposition coefficientsfAfter the adjustment down, it is then calculated again.
5. The method for constructing the space curved net shell with high precision under the limited environment according to claim 1, wherein the method comprises the following steps: when the installation convenience and the implementation convenience of the hidden weld joint of the pipe fitting in the step 5 cannot be met at the same time, adopting an eccentric node design scheme, wherein the eccentric design meets the standard requirement; when the eccentric node scheme is still not satisfied at the same time, a non-eccentric node scheme is selected to satisfy the implementation of the hidden weld joint.
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