Large-span multi-cavity profile steel special-shaped curved surface structure system shaped like Chinese character'mu 'and mounting method thereof

Abstract

The invention discloses a large-span multi-cavity profile steel special-shaped curved surface structure system shaped like a Chinese character'mu 'and a mounting method thereof. A roof truss is composed of a main rod piece and a secondary rod piece, and the main rod piece and the secondary rod piece are profile steel with the section shaped like the Chinese character'mu' and provided with at least three vertical closed cavities; comprising an upper flange plate, a lower flange plate, a left web plate, a right web plate and at least two horizontal stress plates arranged between the left web plate and the right web plate. The section form greatly improves the bending resistance, the torsional rigidity and the bearing capacity of the rod piece. Therefore, the formed special-shaped shell structure can achieve super-large span, structural unit lattices are increased, and the adaptability to complex and changeable space models is remarkably improved. The technical problems that a traditional box-type section shell structure is limited in span, too dense in grid, inflexible in modeling and difficult in site construction of a complex section are solved, and the box-type section shell structure has the advantages of being high in bearing capacity, economical in steel use, free in modeling and feasible in construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of civil engineering construction, and particularly relates to a large-span Z-shaped multi-chamber steel special-shaped curved surface structure system and an installation method thereof. Background Art

[0002] In the field of contemporary large-span public buildings and industrial buildings, such as stadiums, transportation hubs, exhibition centers, and large factories, the requirements for roof structures are increasing day by day. These structures not only need to cover a vast column-free space to achieve a flexible and transparent architectural effect, but also pursue unique and expressive special-shaped curved surface shapes to meet the architectural aesthetic and functional requirements.

[0003] Currently, the main forms of realizing large-span space structures include grid structures, latticed shell structures, and single-layer or double-layer shell structures composed of box-section beams. Among them, the shell structure composed of welded box-section members (usually rectangular or square steel pipes) is widely used due to its good bending and torsional resistance. Such structures form a stable curved surface shell through the orderly connection of members in space. However, the existing technical solutions with box-section members as the basic unit have obvious limitations. First, for a single closed-chamber box member, the flexural moment of inertia and torsional stiffness of its cross-section are limited in enhancing the bearing capacity when facing ultra-large spans (such as spans exceeding 150 meters) or complex spatial forces caused by special-shaped curved surfaces. This directly leads to the difficulty in further breaking through the overall span of the structure, or having to significantly increase the cross-section size or steel consumption of the members to achieve a large span, resulting in poor economy. Second, limited by the bearing capacity of the members, the structure grid (i.e., the division of the shell structure unit) is usually divided relatively densely, with a large number of members and joints. This not only increases the material and welding workload, but also restricts the flexibility of the structure shape, making it difficult to smoothly achieve large-curvature changes and irregular free-form surfaces. Often, compromises and simplifications need to be made to the ideal shape. Moreover, the dense grid and joints also affect the simplicity and transparency of the indoor vision of the building.

[0004] Therefore, there is an urgent need for a new type of large-span space structure system, whose core load-bearing members have higher bearing efficiency and stiffness while maintaining a reasonable steel consumption, so as to be able to support a larger span, realize a special-shaped shell structure with a larger unit division, and give the building shape greater design freedom. Summary of the Invention

[0005] The purpose of this invention is to provide a large-span, multi-cavity, irregularly curved steel structure system and its installation method. This addresses the technical problems of existing shell structures composed of box-section members having limited load-bearing capacity, making it difficult to economically and efficiently achieve ultra-large span spatial coverage, and the prominent contradiction between mechanical performance and design freedom when realizing complex, varied, and highly curved irregular architectural shapes, often resulting in simplified designs due to structural feasibility limitations. Furthermore, this invention also solves the technical problems of construction operability and quality control challenges in the segmentation, docking, and internal welding of multi-cavity complex cross-section members.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] A large-span, multi-cavity, irregularly shaped curved steel structure system is installed at the top of a supporting structure; it includes main members and secondary members; and multiple main members and secondary members are respectively provided; The secondary members are connected between the main members, and / or connected between the main members and the supporting structure; The main members and secondary members are welded together to form a spatial irregular shell structure; Both the main member and the secondary member include an upper flange plate, a lower flange plate, a left web plate, a right web plate, and at least two horizontal load-bearing plates arranged parallel between the left web plate and the right web plate; the left web plate and the right web plate are welded to the upper flange plate, the lower flange plate, and the horizontal load-bearing plates respectively to form a bar structure with a cross-section of at least three closed chambers.

[0008] Preferably, the main member is a straight rod, a planar folded rod, or a spatial folded rod, which is spliced ​​together from multiple prefabricated rod segments; a hand hole for internal welding operations is provided on the prefabricated rod segment near the splicing node.

[0009] Preferably, it also includes a cover plate for closing the handhole; the cover plate is welded to cover the outside of the handhole.

[0010] Preferably, there are two horizontal load-bearing plates, which divide the interior of the cross-section into three vertical closed chambers of equal or unequal width.

[0011] Preferably, the connection end between the main member and the supporting structure is a full penetration butt weld or a bevel weld; the connection end between the secondary member and the main member is a full penetration butt weld or a bevel weld; and the connection between the secondary member and the supporting structure is a full penetration butt weld or a bevel weld.

[0012] An installation method for a large-span, I-shaped, multi-cavity steel irregular curved surface structure system includes the following steps.

[0013] Step 1: Prefabricate main and secondary members: First, assemble and weld the left web, right web and at least two horizontal load-bearing plates, then weld the upper flange and lower flange to the left web and right web respectively.

[0014] Step two: Position at least two main members and connect both ends of each main member to the supporting structure.

[0015] Step 3: Install the secondary members. Connect one end of the secondary member to the fixed main member, and connect the other end of the secondary member to the supporting structure or another main member.

[0016] Step four: Repeat steps two and three, and install and connect the remaining main members and secondary members in the preset installation order until a complete spatial irregular shell structure is formed.

[0017] Preferably, the pre-set installation sequence of the large-span irregular shell structure roof truss is to install it sequentially from one end of the spatial irregular shell structure to the other end, or to install it symmetrically from the middle area to both ends.

[0018] Preferably, the main rod is divided into at least two prefabricated rod segments along its length, with tongue and groove joints or connecting plates at the segmentation points to facilitate on-site connection, and operating hand holes for internal welding and / or bolt tightening are provided at corresponding positions on the side walls of the prefabricated rod segments.

[0019] Preferably, when prefabricating the main members and secondary members, the butt weld between the horizontal load-bearing plates is performed through a handhole; after welding, a cover plate is placed over the handhole and welded to seal it.

[0020] Compared with the prior art, the present invention has the following features and beneficial effects.

[0021] 1. This invention employs a U-shaped cross-section member. This cross-section is divided into multiple vertically enclosed chambers by at least two built-in horizontal load-bearing plates, forming a composite reinforcement effect similar to a multi-web I-beam and a multi-chamber box girder. Compared to a single-chamber box girder with the same external dimensions, the U-shaped cross-section exhibits significantly increased bending moment of inertia and torsional stiffness, resulting in a substantial improvement in ultimate bearing capacity. This allows the member to withstand greater bending and torsional moments with the same amount of steel or similar cross-sectional height, thus providing a strong mechanical foundation for the core structure to achieve spans of hundreds of meters or even larger.

[0022] 2. The present invention increases the structural grid division, optimizes the economy and architectural effect. Due to the extremely high bearing capacity of a single rod, larger grid sizes can be adopted to divide the structural surface. This design directly reduces the total number of rods and nodes in the entire roof structure, not only simplifies the structure, reduces the workload and cost of factory production and on-site installation, but also reduces potential welding weak points and improves the structural reliability. From the perspective of the architectural effect, the sparser and grander grid division brings a more concise and shocking visual experience of the interior space, enhancing the expressiveness of the structure.

[0023] 3. The "Mu"-shaped rods of the present invention with high bearing capacity and high stiffness can better adapt to and support various complex three-dimensional curved surfaces, including special-shaped shell structures such as hyperbolic paraboloids and free-form surfaces. The rods can be designed as straight rods or can be easily fabricated into planar or spatial folded rods, providing a solid technical support for architects to realize their imaginative creative shapes, truly achieving the unity of form following force and force and form.

[0024] 4. Aiming at the characteristics of multi-chamber of the "Mu"-shaped rods, the present invention solves the problem of the accessibility of welding seams inside the multi-chambers for on-site welding and inspection by presetting hand holes. Socket joints or connecting plates are set at the segmented parts, and the installation sequence from one end to the other end or from the middle to both ends is specified, effectively controlling the cumulative error and installation stress during the construction process. The process of sealing the hand holes with covers not only ensures the integrity of the cross-section and anti-corrosion performance, but also makes the appearance neat. These methods ensure that complex cross-section rods can be assembled into an integral whole efficiently, with high precision and high quality under on-site conditions, transforming the design advantages into engineering reality.

[0025] 5. Through the innovation of materials and cross-section forms, combined with a systematic construction method, the present invention successfully provides a large-span special-shaped space structure solution with stronger spanning ability, better economy, greater造型潜力 (it seems there is a missing word here, maybe "modeling potential"), and easier implementation, strongly promoting the technological progress of large public buildings and industrial buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following further describes the present invention in detail with reference to the drawings.

[0027] Figure 1 FIG. is a schematic structural view of the large-span special-shaped shell structure roof truss of the present invention arranged on the support structure.

[0028] Figure 2 FIG. is a three-dimensional structural view of the large-span special-shaped shell structure roof truss of the present invention.

[0029] Figure 3 FIG. is a front structural view of the large-span special-shaped shell structure roof truss of the present invention.

[0030] Figure 4 FIG. is a structural view of the main rod of the present invention.

[0031] Figure 5 This is a schematic diagram of the structure of the main member after it has been cut open in this invention.

[0032] Figure 6 This is a schematic diagram of the secondary member in this invention.

[0033] Figure 7 This is a schematic diagram of the structure of the secondary member after it has been cut open in this invention.

[0034] Reference numerals in the attached drawings: 1 - Support structure, 2 - Main member, 2.1 - Precast member segment, 3 - Secondary member, 23.1 - Upper flange plate, 23.2 - Lower flange plate, 23.3 - Left web plate, 23.4 - Right web plate, 23.5 - Horizontal load-bearing plate, 4 - Handhole, 5 - Cover plate, 6 - Lifting ring. Detailed Implementation

[0035] like Figure 1-7 As shown, this large-span, I-shaped, multi-cavity steel irregular curved surface structure system is set on the top of the supporting structure 1; it includes main members 2 and secondary members 3; and multiple main members 2 and secondary members 3 are respectively provided; The secondary member 3 is connected between the main members 2, and / or connected between the main member 2 and the support structure 1; The main member 2 and the secondary member 3 are welded together to form a spatial irregular shell structure; Both the main member 2 and the secondary member 3 include an upper flange plate 23.1, a lower flange plate 23.2, a left web plate 23.3, a right web plate 23.4, and at least two horizontal load-bearing plates 23.5 arranged parallel between the left web plate 23.3 and the right web plate 23.4. The left web plate 23.3 and the right web plate are welded to the upper flange plate 23.1, the lower flange plate 23.2, and the horizontal load-bearing plates 23.5 respectively to form a bar structure with a cross-section of at least three closed chambers.

[0036] In this embodiment, the main rod 2 is a straight rod, a planar folded rod, or a spatial folded rod, which is spliced ​​together from multiple prefabricated rod segments 2.1; a hand hole 4 for internal welding operations is provided on the prefabricated rod segment 2.1 near the splicing node.

[0037] In this embodiment, the roof truss consists of six spatially curved main members 2 arranged along the main ridge line and secondary members 3 densely spaced and connected between adjacent main members 2, together forming a spatial curved shell structure.

[0038] In this embodiment, the main member 2 has a cross-sectional height of 1800mm and a width of 1000mm. It contains two horizontal load-bearing plates 23.5, each 25mm thick, which uniformly divide the cross-section into three vertically enclosed chambers of equal height. The upper and lower flanges and the left and right webs are all 30mm thick. The secondary member 3 uses the same cross-section, with a height of 1800mm and a width of 1000mm. It also contains two horizontal load-bearing plates 23.5, forming three chambers. All steel plates are made of Q355B steel.

[0039] In this embodiment, a cover plate 5 for sealing the handhole 4 is also included; the cover plate 5 is welded to cover the outside of the handhole 4.

[0040] In this embodiment, there are two horizontal force-bearing plates 23.5, which divide the interior of the cross-section into three vertical closed chambers of equal or unequal width.

[0041] In this embodiment, the connection end between the main member 2 and the support structure 1 is a full penetration butt weld or a bevel weld; the connection end between the secondary member 3 and the main member 2 is a full penetration butt weld or a bevel weld; the connection between the secondary member 3 and the support structure 1 is a full penetration butt weld or a bevel weld.

[0042] In this embodiment, the supporting structure 1 is a structural column. Of course, in other structures, the supporting structure 1 can also be a structural wall.

[0043] In this embodiment, lifting rings 6 for hoisting are provided at intervals along the longitudinal axis on the top of the main member 2 and the secondary member 3.

[0044] The installation method for this large-span, multi-cavity, irregularly curved steel structure system follows the principles of symmetry and segmented stability in the overall installation sequence, and includes the following steps.

[0045] Step 1: Prefabricate main member 2 and secondary member 3: First, assemble and weld the left web plate 23.3, the right web plate 23.4 and at least two horizontal load-bearing plates 23.5, and then weld the upper flange plate 23.1 and the lower flange plate 23.2 to the left web plate 23.3 and the right web plate 23.4 respectively.

[0046] Step 2: Position at least two main members 2 and connect both ends of each main member 2 to the support structure 1.

[0047] Step 3: Install the secondary member 3. Connect one end of the secondary member 3 to the fixed main member 2, and connect the other end of the secondary member 3 to the support structure 1 or another main member 2.

[0048] Step four: Repeat steps two and three, and install and connect the remaining main members 2 and secondary members 3 in the preset installation order until a complete spatial irregular shell structure is formed.

[0049] In this embodiment, the preset installation sequence of the long-span special-shaped shell structure truss is to install it sequentially from one end of the spatial special-shaped shell structure to the other end, or to install it symmetrically from the middle area to both ends.

[0050] In this embodiment, the main member 2 is divided into at least two precast rod segments 2.1 along its length direction. There are tenons or connecting plates at the segmentation points for facilitating on-site docking, and operation handholes 4 are provided at corresponding positions on the side walls of the precast rod segments 2.1 for internal welding and / or bolt fastening.

[0051] In this embodiment, when precasting the main members 2 and the secondary members 3, the butt welds between the horizontal stress plates 23.5 are welded through the handholes 4. After welding is completed, the cover plate 5 is covered on the handholes 4 and welded and sealed.

[0052] In this embodiment, the long-span special-shaped shell structure truss of the present invention is mainly composed of six main members 2 and several secondary members 3. The long-span special-shaped shell structure truss is supported on the surrounding or lower support structure 1 to form a large-span, curved special-shaped spatial stress system.

[0053] When assembling the main members 2 and the secondary members 3, first, the left web 23.3, the right web 23.4, and the two horizontal stress plates 23.5 are positioned and welded in the factory to form a skeleton with a double cavity inside. Then, the upper flange plate 23.1 and the lower flange plate 23.2 are respectively welded to the top and bottom of the skeleton and connected to the upper flange plate 23.1 and the lower flange plate 23.2, finally forming a "mu" - shaped closed section with three vertical cavities. For the ultra-long main member 2, it is manufactured in segments in the factory, and handholes 4 are reserved at the segmentation points. During on-site assembly, the segmented precast rod segments 2.1 are aligned and welded, and the butt weld of the two horizontal stress plates 23.5 is operated through the handholes 4. Finally, the cover plate 5 is welded and sealed.

[0054] The cross-section structure of the secondary member 3 is similar to that of the main member 2, including an upper flange plate 23.1, a left web 23.3, a right web 23.4, a lower flange plate 23.2, two horizontal stress plates 23.5, and a cover plate 5. Its assembly process is also the same as that in the factory assembly stage of the main member 2.

[0055] In this embodiment, because the main member 2 is spatially tortuous and long, it is divided into several prefabricated segments 2.1 in the factory for easy transportation and hoisting. The segmentation points are selected at locations with smaller bending moments, and the length of each segment is controlled between 25 and 30 meters. The prefabricated segments 2.1 are assembled and welded in the factory. A rectangular handhole 4 with dimensions of 400 mm x 600 mm is made on the upper and lower flange plates approximately 500 mm from the joint end face of the segment, serving as the sole channel for subsequent on-site welding and inspection of the butt weld. Precision welding bevels and positioning tongues are machined at the segment interfaces to ensure on-site alignment accuracy.

[0056] The above embodiments are not exhaustive examples of specific implementation methods, and other embodiments are also possible. The purpose of the above embodiments is to illustrate the present invention, rather than to limit the scope of protection of the present invention. All applications derived from simple variations of the present invention fall within the scope of protection of the present invention.

Claims

1. A large-span, multi-cavity, irregularly shaped curved steel structure system, set on top of a supporting structure (1); characterized in that: It includes a main member (2) and a secondary member (3); the main member (2) and the secondary member (3) are provided with multiple members respectively; The secondary member (3) is connected between the main members (2) and / or between the main members (2) and the supporting structure (1); The main member (2) and the secondary member (3) are welded together to form a spatial irregular shell structure; Both the main member (2) and the secondary member (3) include an upper flange plate (23.1), a lower flange plate (23.2), a left web plate (23.3), a right web plate (23.4), and at least two horizontal load-bearing plates (23.5) arranged parallel between the left web plate (23.3) and the right web plate (23.4); the left web plate (23.3) and the right web plate are welded to the upper flange plate (23.1), the lower flange plate (23.2), and the horizontal load-bearing plates (23.5) respectively to form a bar structure with a cross-section of at least three closed chambers.

2. The large-span, I-shaped, multi-cavity steel irregular curved surface structure system according to claim 1, characterized in that: The main member (2) is a straight rod, a planar folded rod, or a spatial folded rod, and is spliced ​​from multiple prefabricated rod segments (2.1); a hand hole (4) for internal welding operation is provided on the prefabricated rod segment (2.1) near the splicing node.

3. The large-span, I-shaped, multi-cavity steel profiled curved surface structure system according to claim 2, characterized in that: It also includes a cover plate (5) for closing the handhole (4); the cover plate (5) is welded to cover the outside of the handhole (4).

4. The large-span, I-shaped, multi-cavity steel irregular curved surface structure system according to claim 1, characterized in that: The number of horizontal load-bearing plates (23.5) is two, which divide the interior of the cross section into three vertical closed chambers of equal or unequal width.

5. The large-span, I-shaped, multi-cavity steel irregular curved surface structure system according to claim 1, characterized in that: The connection end between the main member (2) and the support structure (1) is a full penetration butt weld or a groove weld; the connection end between the secondary member (3) and the main member (2) is a full penetration butt weld or a groove weld; the connection between the secondary member (3) and the support structure (1) is a full penetration butt weld or a groove weld.

6. An installation method for a large-span, I-shaped, multi-cavity steel irregular curved surface structure system according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1, prefabricate the main members (2) and secondary members (3): first assemble and weld the left web plate (23.3), the right web plate (23.4) and at least two horizontal load-bearing plates (23.5), and then weld the upper flange plate (23.1) and the lower flange plate (23.2) to the left web plate (23.3) and the right web plate (23.4) respectively; Step 2: Position at least two main members (2) and connect both ends of each main member (2) to the support structure (1); Step 3: Install the secondary member (3), connect one end of the secondary member (3) to the fixed main member (2), and connect the other end of the secondary member (3) to the support structure (1) or another main member (2); Step four, repeat steps two and three, and install and connect the remaining main members (2) and secondary members (3) in sequence according to the preset installation order until a complete spatial irregular shell structure is formed.

7. The installation method according to claim 6, characterized in that: The pre-set installation sequence for large-span irregular shell structure roof trusses is to install them sequentially from one end of the spatial irregular shell structure to the other end, or to install them symmetrically from the middle area to both ends.

8. The installation method according to claim 6, characterized in that: The main member (2) is divided into at least two prefabricated segments (2.1) along its length. The segment is provided with tongue and groove joints or connecting plates for easy on-site connection. The corresponding position on the side wall of the prefabricated segment (2.1) is provided with a hand hole (4) for internal welding and / or bolt fastening.

9. The installation method according to claim 8, characterized in that: When prefabricating the main member (2) and the secondary member (3), the butt weld between the horizontal load-bearing plates is welded through the handhole (4); after the welding is completed, the cover plate (5) is placed over the handhole (4) and welded to seal it.

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