Arc-shaped curved surface honeycomb stainless steel curtain wall back-attached truss connecting system and mounting method

Abstract

The invention discloses an arc-shaped curved surface honeycomb stainless steel curtain wall back-attached truss connecting system and a mounting method. The system comprises a back-attached truss system, a truss unit body flange connecting assembly system and a panel-truss connecting assembly system. The back-attached truss system is a spatial three-dimensional truss formed by welding a primary truss and a secondary truss, the appearance of the back-attached truss system is matched with the curvature of a target curved surface, and the back-attached truss system is accurately prefabricated in a factory based on a BIM model. The truss unit bodies are connected through square or round flanges welded to the ends of the rod pieces and bolts. According to the panel-truss connecting assembly system, the honeycomb stainless steel panel is connected with the truss through the clamping design of the circular pipe hoop, the first adapter profile and the second adapter profile, temperature stress can be effectively released, and fine adjustment in the three-dimensional direction is allowed to adapt to main body structure errors. Through digital modeling, factory prefabrication and modular field installation in the whole process, the beneficial effects of high precision, high adaptability, high safety and convenient construction are achieved, and the building problem of the complex arc-shaped curved surface curtain wall is perfectly solved.

Description

Technical Field

[0001] This invention belongs to the field of architectural curtain wall design and construction technology, specifically relating to a back-attached truss connection system and installation method for an arc-shaped curved honeycomb stainless steel curtain wall, which is used to realize the support structure system and precise installation method of the complex three-dimensional arc-shaped honeycomb stainless steel curtain wall. Background Technology

[0002] With the development of modern architectural aesthetics, building facades with flowing, irregular curved surfaces are becoming increasingly popular. Honeycomb stainless steel panels, due to their high strength, light weight, smooth surface, and corrosion resistance, have become an ideal material for achieving such curtain walls. However, existing technologies face many challenges in realizing complex curved surfaces: (1) Difficulty in positioning: Traditional frame curtain walls are difficult to adapt to the changes of three-dimensional hyperboloids. The coordinates of the positioning points of each panel are different, making the measurement and layout work extremely cumbersome and the accuracy difficult to guarantee.

[0003] (2) The contradiction between connection stiffness and degree of freedom: It is necessary to ensure that the connection between the curtain wall panel and the main structure has sufficient strength to resist wind load and seismic load, while also providing multi-dimensional adjustment capabilities to adapt to construction errors and structural deformation.

[0004] (3) Stress concentration: If the connection node is not properly designed at the surface transition, stress concentration may occur inside the plate or connector, affecting structural safety.

[0005] (4) Low installation efficiency: Each panel requires repeated on-site measurement, positioning and adjustment, resulting in a long construction period and high cost.

[0006] (5) Difficulty in controlling flatness: Due to factors such as material properties and processing technology, the yield rate of irregularly shaped panels, especially composite irregularly shaped panels, is much lower than that of flat single-sided panels. Moreover, it is difficult to test the processing accuracy of irregularly shaped panels. In addition, the panels that have passed the factory inspection may be deformed during transportation. For large-area honeycomb panels, how to ensure that the curved surface is smooth and without bumps after installation is a major challenge in construction.

[0007] Therefore, ensuring that material processing meets the actual needs of the project and minimizing the impact of each stage before material installation on the wall, thus achieving efficient and high-quality completion of the curtain wall project, is a pressing problem that needs to be solved. There is an urgent need for an innovative system and method that can achieve precise, efficient, and safe installation of curved honeycomb stainless steel curtain walls. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a curved honeycomb stainless steel curtain wall back truss connection system and installation method. This system has the characteristics of high precision, high adaptability, high safety and convenient construction, and connects the structural system and process form from factory processing, verification, material transportation and on-site construction.

[0009] A curved honeycomb stainless steel curtain wall back-attached truss connection system is characterized by comprising a back-attached truss system, a truss unit flange connection assembly, and a panel-truss connection assembly system.

[0010] The back-attached truss system is a spatial three-dimensional truss formed by welding the main truss and the secondary truss together. Its shape is adapted to the curvature of the target arc surface. Both the main truss and the secondary truss are composed of upper chord, lower chord and web members. The truss is precisely prefabricated in the factory according to the building information model (BIM) data and serves as the main load-bearing skeleton of the honeycomb stainless steel curtain wall. The truss unit connection assembly includes a square flange, a round flange, and flange bolts; The panel-truss connection system includes a circular tube clamp fixed to the main or secondary truss of the backing truss and a first adapter profile fixed to the back of the honeycomb stainless steel panel. The first adapter profile and the circular tube clamp are connected by a second adapter profile, allowing the honeycomb stainless steel panel to have slight displacement freedom in the plane to release temperature stress. This panel-truss connection system allows for fine-tuning of the backing truss in the X, Y, and Z directions and can rotate slightly around a specific axis to accommodate construction errors in the main structure.

[0011] Furthermore, a curved honeycomb stainless steel curtain wall back truss connection system is characterized in that it can be divided into several small panel-truss units according to the target curved surface, wherein the panel is a honeycomb stainless steel panel, which is CNC cut and bent in the factory according to the BIM model to form precise curved panel blocks.

[0012] Furthermore, the back-attached truss system consists of curved main trusses and secondary trusses, with curvature changes adapted to the target arc surface. Both the main truss and secondary trusses are composed of upper chords, lower chords, and web members. Preferably, the upper chords and lower chords of the main truss and secondary trusses are spliced ​​with arc-shaped round tubes, and the web members are made of round steel tubes or square steel tubes, thereby forming a curved shape.

[0013] Furthermore, the main trusses and secondary trusses are arranged in an alternating manner, with the secondary trusses reinforced by secondary members. The main trusses are positioned first, and then the secondary trusses are embedded into the main truss according to the positioning nodes, and then welded and fixed.

[0014] Furthermore, the back-attached truss systems are connected by truss unit flange connection assemblies, which consist of square flanges, round flanges, and flange bolts. The square or round flanges are welded to the ends of the main truss members at the splicing points of the back-attached trusses. After being connected by flange bolts, the back-attached truss systems are integrated into a whole.

[0015] Furthermore, the flange does not have elongated holes, but only round holes; the flange should be pre-welded to the corresponding chord position to ensure the structural length of the component.

[0016] Furthermore, the round tube clamp of the panel-truss connection assembly is connected to the main truss or secondary truss by clamp bolts, the upper side of the round tube clamp is connected to the connecting transition plate by adjusting bolts, the connecting transition plate is connected to the second transition profile by adjusting bolts, and the second transition profile and the first transition profile are connected to the honeycomb stainless steel panel by stainless steel bolts.

[0017] Furthermore, the panel-truss connection assembly can connect the honeycomb stainless steel panel to the back truss to form a panel-truss unit, and two panel-truss units can be spliced ​​together by square or round flanges and flange bolts.

[0018] Furthermore, both the overall back-attached truss and the disassembled back-attached truss units should be verified through structural calculations. It should be ensured that the overall truss meets the stress requirements under both the pre-assembly stage and the service stage, and that the structure deforms in a coordinated manner. Structural deformation should be controlled by the precision requirements of the curtain wall surface joints.

[0019] It includes a circular tube clamp fixed to the main or secondary truss of the back-attached truss and a first adapter profile fixed to the back of the honeycomb stainless steel plate. The first adapter profile and the circular tube clamp are connected by a second adapter profile through a snap-fit ​​design. Preferably, the round pipe clamp, the first adapter profile, and the second adapter profile are made of aluminum alloy. An installation method for an arc-shaped curved honeycomb stainless steel curtain wall includes the following steps: 1. Digital modeling and prefabrication A complete BIM model was established, including the main structure, curtain wall curved surfaces, back trusses, and connection nodes. Based on the BIM model data, the back trusses, honeycomb stainless steel panels, and all connectors were digitally fabricated in the factory. Corresponding jigs were set up in the factory according to the back truss connection system for assembling the back truss connection system, in order to facilitate subsequent panel pre-assembly.

[0020] 2. Measurement and positioning Using high-precision surveying instruments such as total stations, the three-dimensional coordinates of each control point were measured on the main structure on site. The main truss was positioned first, and then the secondary trusses were embedded into the main truss according to the positioning nodes of the main truss and welded in place.

[0021] 3. Lifting and rough adjustment of the truss backing The prefabricated back-attached truss is hoisted to the design position in sections. The overall attitude of the truss is measured using a total station. The spatial position of the truss is initially corrected by adjusting the flange connection nodes of the truss unit.

[0022] 4. Precise positioning and fixing of trusses After the truss is finely adjusted and qualified, tighten all the locking nuts on the flanges and weld or use other methods to fix the connection parts so that the truss becomes a stable space support system.

[0023] 5. Honeycomb panel installation After the overall back-attached truss connection system is installed, the adapters are positioned and installed, and the panels are pre-assembled to verify the panel processing accuracy. The hangers on the back of the panel are aligned with the aluminum alloy round tube clamps on the truss and then plugged in or snapped together.

[0024] 6. Panel-truss unit assembly At the construction site, the disassembled large units will be hoisted and assembled into a whole using high-precision flanges.

[0025] 7. Final adjustment and sealing Perform a final flatness and joint width check and adjustment on all installed panels. Fill the panel joints with foam rods and apply weather-resistant sealant to complete the sealing process.

[0026] Compared with the prior art, the advantages of the present invention are as follows: (1) High precision and high quality: The core components (trusses, plates) are prefabricated in the factory, which minimizes the error of on-site processing and ensures the accuracy of the final curved surface shape and the flatness of the plate surface.

[0027] (2) Strong adaptability: The dual adjustment system (truss adjustment + plate adjustment) can effectively absorb and digest the construction errors and deformations of the main structure, and perfectly adapt to complex three-dimensional curved surfaces.

[0028] (3) Structural safety and reliability: The back truss provides strong rigid support, the multi-dimensional adjustment connection system avoids stress concentration caused by hard connection, the overall system has a clear force transmission path, and good seismic and wind resistance performance.

[0029] (4) Highly efficient installation: It realizes the prefabricated construction of the curtain wall like building blocks, which greatly reduces on-site measurement, cutting and welding operations, significantly improves installation efficiency and shortens the construction period.

[0030] (5) Good maintainability: The connection design facilitates the disassembly and replacement of individual boards, which provides convenience for later maintenance. Attached Figure Description

[0031] Figure 1 Schematic diagram of the overall structural system of the curved honeycomb stainless steel curtain wall with attached truss connection system Figure 2 Exploded view of the overall structural system of the curved honeycomb stainless steel curtain wall with truss connection system Figure 3 Back-mounted truss schematic diagram Figure 4 Schematic diagram of main truss structure embodiment Figure 5 3D diagram of the back truss unit connection assembly Figure 6 Schematic diagram of flange connection of back truss unit Figure 7 Schematic diagram of embodiment 1 of panel-truss unit Figure 8 Schematic diagram of embodiment 2 of panel-truss unit Figure 9 3D diagram of panel-truss connection component system Figure 10 3D rendering of panel-truss connection component system Explanation of reference numerals in the attached figures 1-Back-attached truss system; 11-Main truss; 12-Secondary truss; 13-Secondary member; 111-Lower chord of main truss; 112-Upper chord of main truss; 113-Web member of main truss; 121-Lower chord of secondary truss; 122-Upper chord of secondary truss; 123-Web member of secondary truss; 2- Truss unit flange connection assembly system; 21: Square flange; 22: Round flange; 23: Flange bolts 3-Panel-Truss Connection Component System 31-First adapter profile; 32-Second adapter profile; 33-Round pipe clamp; 34-Clamp bolt; 35-Stainless steel bolt; 36-Connecting transition plate; 37-Adjusting bolt 4-Honeycomb stainless steel panel; 5-Panel-Truss Unit 5. Detailed Implementation The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0032] Figure 1This is a schematic diagram of the overall structural system of the curved honeycomb stainless steel curtain wall back-attached truss connection system. The system consists of a back-attached truss system 1, a truss unit flange connection assembly system 2, and a panel-truss connection assembly system 3. The back-attached truss systems 1 are connected via the truss unit flange connection assembly system 2. Honeycomb stainless steel panels 4 are evenly distributed on the outer surface of the system and reliably connected to the back-attached truss system 1 via the panel-truss connection assembly system 3, forming a structurally sound and aesthetically pleasing curtain wall structure. Figure 2 This is an exploded view of the overall structural system of the curved honeycomb stainless steel curtain wall back-attached truss connection system. The back-attached truss system 1 can be divided into several small panel-truss units 5 according to the target curved surface. Specifically, the panels are honeycomb stainless steel panels, which are CNC cut and bent into precise curved panel blocks in the factory according to the BIM model. Specifically, the back-attached truss system 1 should be checked through structural calculations to ensure that the overall truss can meet the stress requirements under two different boundary conditions, namely the pre-assembly stage and the use stage, and that the structure should deform in a coordinated manner. The structural deformation is controlled by the joint accuracy requirements of the curtain wall skin.

[0033] Figure 3 This is a schematic diagram of the back-attached truss system. The shape of the back-attached truss system 1 is adapted to the curvature of the target arc-shaped surface. The back-attached truss system 1 is a spatial three-dimensional truss structure composed of a curved main truss 11 and a secondary truss 12 welded together. The upper and lower chords of the main truss 11 and the secondary truss 12 are spliced ​​with arc-shaped round tubes, and the web members are made of round or square steel tubes, thus forming a curved shape. The main truss 11 and the secondary truss 12 are arranged in an alternating manner and are tightly connected by welding. During installation, the main truss 11 is positioned first, and then the secondary truss 12 is embedded into the secondary truss 12 according to the positioning nodes of the main truss 11 and fixed by welding. Secondary members 13 can be set between the secondary trusses 12 to enhance the overall rigidity. Specifically, the main truss 11 and the secondary truss 12 are precisely prefabricated in the factory according to the Building Information Model (BIM) data, serving as the main load-bearing skeleton of the honeycomb stainless steel curtain wall. Figure 4 The diagram shows an embodiment of the main truss structure. The main truss 11 is welded together from the lower chord 111, the upper chord 112, and the web members 113. These members cooperate with each other to bear loads in various directions. The main truss 11 is divided into several segments according to the determined splicing dimensions on site. As the main load-bearing component, the main truss 11 bears and transmits external loads to the supporting structure. Furthermore, both the lower chord 111 and the upper chord 112 of the main truss are made of arc-shaped circular tubes spliced ​​together; the curvature of the lower chord 111 of the main truss varies along the panel splice line, and its tube centerline is the normal offset line of the splice line; the curvature of the upper chord is adjusted with the lower chord. Furthermore, the main truss web members 113 are made of round or square steel tubes, which are connected between the upper chord 112 and the lower chord 111 of the main truss at specific angles and positions, playing a key supporting and reinforcing role.

[0034] Furthermore, the dimensions of each member of the main truss are precisely calculated. Based on the dimensions of the curtain wall, the load, and the design requirements, the pipe diameter, wall thickness, and other parameters of the main truss lower chord 111, main truss upper chord 112, and main truss web members 113 are reasonably determined to ensure that the main truss 11 maintains good mechanical performance when subjected to various loads.

[0035] Figures 5-6 The diagram shows a 3D view of the back-attached truss unit connection assembly and a schematic diagram of the flange connection. The truss unit flange connection assembly system 2 includes a square flange 21, a round flange 22 and flange bolts 23. The square flange 21 or the round flange 22 is welded to the end of the main truss 11 at the splicing point of the back-attached truss system 1. After being connected by the flange bolts 23, the back-attached truss systems 1 are connected as a whole.

[0036] Both the square flange 21 and the round flange 22 are made of steel plate. They are installed at the locations where disassembly is required; the openings on the square flange 21 or the round flange 22 are all round holes; the square flange 21 or the round flange 22 should be pre-welded to the corresponding location of the main truss 11 to be disassembled.

[0037] Figures 7-8 This is a schematic diagram of an embodiment of the panel-truss unit. Different embodiments constitute the basic installation units of the entire curved honeycomb stainless steel curtain wall. The honeycomb stainless steel panel 4 and the backing truss system 1 are tightly connected through the panel-truss connection component system 3 to form a panel-truss unit 5. The honeycomb stainless steel panel 4 is CNC cut and bent into a precise curved shape according to the BIM model in the factory, and has the advantages of high strength, lightweight, and corrosion resistance. The backing truss system 1 serves as the load-bearing skeleton, and its curve matches the curved surface of the panel, with a firm and reliable welded connection.

[0038] Furthermore, the secondary truss 12 is welded together from the lower chord 121, the upper chord 122, and the web members 123; the ends of the secondary truss 12 are tangentially intersecting and welded to the main truss 11. The secondary truss 12 is interspersed between the main trusses 11, mainly to enhance the overall stiffness and stability of the truss and to share part of the load.

[0039] Figure 9The panel-truss connection assembly system 3 is shown in a 3D diagram. The panel-truss connection assembly system 3 includes a circular tube clamp 33 fixed to the main truss 11 or secondary truss 12 of the back truss and a first adapter profile 31 fixed to the back of the honeycomb stainless steel panel 4. The first adapter profile 31 and the circular tube clamp 33 are connected by a second adapter profile 32. The first adapter profile 31 is fixed to the back of the honeycomb stainless steel panel 4, and the second adapter profile 32 realizes the snap-fit ​​between the first adapter profile 31 and the circular tube clamp 33. This snap-fit ​​design allows the honeycomb stainless steel panel 4 to have a small degree of displacement freedom in the plane, which can effectively release temperature stress.

[0040] Furthermore, the panel-truss connection component system 3 can connect the honeycomb stainless steel panel 4 to the back truss system 1 to form a panel-truss unit. The two panel-truss units are spliced ​​together by a square flange 21 or a round flange 22 and flange bolts 23.

[0041] Furthermore, the panel-truss connection assembly system 3 also supports fine-tuning of the back-attached truss system 1 in the X, Y, and Z directions, and can rotate slightly around a specified axis to accommodate installation errors of the main structure.

[0042] Figure 10 This is a three-dimensional view of the panel-truss connection component system. The round tube clamp 33 of the panel-truss connection component system 3 is connected to the main truss or secondary truss by clamp bolts 34. The upper side of the round tube clamp 33 is connected to the connecting transition plate 36 by adjusting bolts 37. The connecting transition plate 36 is connected to the second transition profile 32 by adjusting bolts 37. The second transition profile 32 and the first transition profile 31 are connected to the honeycomb stainless steel panel 4 by stainless steel bolts 35.

[0043] Specifically, the round tube clamp 33, the first adapter profile 31 and the second adapter profile 32 are made of aluminum alloy.

Claims

1. A curved honeycomb stainless steel curtain wall back-attached truss connection system and installation method, characterized in that, include: The back-attached truss system (1) is adapted to the curvature of the target arc surface and serves as the main load-bearing skeleton of the curtain wall. Truss unit flange connection assembly system (2) is used to connect adjacent back-attached truss systems (1) to achieve their overall splicing; A panel-truss connection assembly system (3) is used to connect the honeycomb stainless steel panel (4) to the outer surface of the back-attached truss system (1); The honeycomb stainless steel panel (4) is connected to the back truss system (1) through the panel-truss connection component system (3) to form a panel-truss unit (5); multiple panel-truss units (5) are spliced ​​together through the truss unit body flange connection component system (2) to form a complete arc-shaped curved curtain wall.

2. The arc-shaped curved surface honeycomb stainless steel curtain wall back-attached truss connection system according to claim 1, characterized in that, The back-attached truss system (1) is a spatial three-dimensional truss structure composed of a curved main truss (11) and a secondary truss (12) welded together; the upper chord and lower chord of the main truss (11) and the secondary truss (12) are spliced ​​together with arc-shaped round tubes, and the web members are made of round steel tubes or square steel tubes; the main truss (11) and the secondary truss (12) are staggered and welded together.

3. The arc-shaped curved surface honeycomb stainless steel curtain wall back-attached truss connection system according to claim 2, characterized in that, The main truss (11) includes a main truss lower chord (111), a main truss upper chord (112), and a main truss web member (113) connecting them; the curvature of the main truss lower chord (111) varies along the joint line of the curtain wall panel.

4. The arc-shaped curved surface honeycomb stainless steel curtain wall back-attached truss connection system according to claim 2, characterized in that, The secondary truss (12) includes a lower chord (121), an upper chord (122), and a web member (123); the ends of the secondary truss (12) are cut with intersecting joints and are welded and fixed to the main truss (11).

5. The arc-shaped curved surface honeycomb stainless steel curtain wall back-attached truss connection system according to claim 1, characterized in that, The truss unit flange connection assembly system (2) includes a square flange (21), a round flange (22) and flange bolts (23); the square flange (21) or the round flange (22) is welded to the end of the main truss (11) in the back-attached truss system (1), and the connection between adjacent back-attached truss systems (1) is realized by the flange bolts (23).

6. The arc-shaped curved surface honeycomb stainless steel curtain wall back-attached truss connection system according to claim 1, characterized in that, The panel-truss connection assembly system (3) includes: A round tube clamp (33) is fixed to the main truss (11) or secondary truss (12) of the back-attached truss system (1); The first adapter profile (31) is fixed to the back of the honeycomb stainless steel panel (4); The second adapter profile (32) is connected between the first adapter profile (31) and the round tube clamp (33); The second adapter profile (32) and the first adapter profile (31) are designed to snap together, allowing the honeycomb stainless steel panel (4) to have a small degree of displacement freedom in the plane.

7. The arc-shaped curved surface honeycomb stainless steel curtain wall back-attached truss connection system according to claim 6, characterized in that, The circular tube clamp (33) is fixed to the truss by clamp bolts (34); the upper side of the circular tube clamp (33) is connected to a connecting transition plate (36) by adjusting bolts (37); the connecting transition plate (36) is connected to the second adapter profile (32) by adjusting bolts (37); the second adapter profile (32) is connected to the first adapter profile (31) by stainless steel bolts (35).

8. The arc-shaped curved surface honeycomb stainless steel curtain wall back-attached truss connection system according to claim 6 or 7, characterized in that, The panel-truss connection assembly system (3) supports fine-tuning of the back-attached truss system (1) in the X, Y, and Z directions.

9. The arc-shaped curved surface honeycomb stainless steel curtain wall back-attached truss connection system according to claim 1, characterized in that, The honeycomb stainless steel panel (4) and the back-attached truss system (1) are prefabricated in the factory according to the building information model (BIM) data. The honeycomb stainless steel panel (4) is CNC cut and bent into a precise curved shape.

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