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CN-121992866-A - Large-span mesh-shaped multi-cavity section steel special-shaped curved surface structure system and installation method thereof

CN121992866ACN 121992866 ACN121992866 ACN 121992866ACN-121992866-A

Abstract

The large-span mesh-shaped multi-cavity section steel special-shaped curved surface structure system comprises a main rod piece and a secondary rod piece, wherein the main rod piece and the secondary rod piece are mesh-shaped section steel with at least three vertical closed chambers, and the mesh-shaped multi-cavity section steel comprises 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 upper flange plate and the lower flange plate. The section form greatly improves the bending resistance, torsional rigidity and bearing capacity of the rod piece. The special-shaped shell structure formed by the method can realize ultra-large span, increase structural unit cells and remarkably enhance the adaptability to complex and changeable space modeling. The invention solves the technical problems of limited span, too dense grid, inflexible modeling and difficult site construction of complex cross sections of the traditional box-section shell structure, and has the advantages of high bearing capacity, economy of steel, free modeling and feasible construction.

Inventors

  • LIU FANGXING
  • ZHAO GUOJUN
  • JIANG TUO
  • LIAO HONGBO
  • ZHANG SHENGLONG
  • LING YUAN
  • LI GUIRAN

Assignees

  • 中建二局安装工程有限公司
  • 中电建路桥集团有限公司

Dates

Publication Date
20260508
Application Date
20260122

Claims (9)

  1. 1. The large-span mesh-shaped multi-cavity section steel special-shaped curved surface structure system is arranged at the top of a supporting structure (1) and is characterized by comprising a main rod piece (2) and a secondary rod piece (3), wherein the main rod piece (2) and the secondary rod piece (3) are respectively provided with a plurality of pieces; the secondary rod piece (3) is connected between the main rod pieces (2) and/or between the main rod pieces (2) and the supporting structure (1); The main rod piece (2) is welded with the secondary rod piece (3) to form a space special-shaped shell structure together; The main rod piece (2) and the secondary rod piece (3) comprise 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 stress plates (23.5) which are arranged between the left web plate (23.3) and the right web plate (23.4) in parallel, wherein the left web plate (23.3) and the right web plate are respectively welded with the upper flange plate (23.1), the lower flange plate (23.2) and the horizontal stress plates (23.5) to form a rod piece structure with a cross section in a shape like a Chinese character 'mu' with at least three closed cavities.
  2. 2. The large-span mesh-shaped multi-cavity shaped steel special-shaped curved surface structure system according to claim 1 is characterized in that the main rod piece (2) is a straight rod, a plane folding rod or a space folding rod, and is formed by splicing a plurality of prefabricated rod sections (2.1), and hand holes (4) for internal welding operation are formed in the prefabricated rod sections (2.1) and close to splicing joints.
  3. 3. The large-span mesh-shaped multi-cavity shaped steel special-shaped curved surface structure system according to claim 2 is characterized by further comprising a cover plate (5) for closing the hand hole (4), wherein the cover plate (5) is welded and covered on the outer side of the hand hole (4).
  4. 4. The large-span mesh-shaped multi-cavity shaped steel special-shaped curved surface structure system according to claim 1, wherein the number of the horizontal stress plates (23.5) is two, and the inside of the section is divided into three vertical closed chambers with equal width or unequal width.
  5. 5. The large-span mesh-shaped multi-cavity shaped steel special-shaped curved surface structure system of claim 1 is characterized in that the connection end of the main rod piece (2) and the supporting structure (1) is a full penetration butt welding seam or a groove welding seam, the connection end of the secondary rod piece (3) and the main rod piece (2) is a full penetration butt welding seam or a groove welding seam, and the connection of the secondary rod piece (3) and the supporting structure (1) is a full penetration butt welding seam or a groove welding seam.
  6. 6. A method for installing a large-span mesh-shaped multi-cavity shaped steel special-shaped curved surface structure system as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps: Firstly, prefabricating a main rod piece (2) and a secondary rod piece (3), namely assembling and welding a left web plate (23.3), a right web plate (23.4) and at least two horizontal stress plates (23.5), and then welding an upper flange plate (23.1) and a lower flange plate (23.2) with the left web plate (23.3) and the right web plate (23.4) respectively; positioning at least two main rod pieces (2), and connecting two ends of each main rod piece (2) with a supporting structure (1); step three, installing a secondary rod piece (3), connecting one end of the secondary rod piece (3) with the fixed main rod piece (2), and connecting the other end of the secondary rod piece (3) with the supporting structure (1) or the other main rod piece (2); And step four, repeating the step two and the step three, and sequentially installing and connecting the rest main rod pieces (2) and the secondary rod pieces (3) according to a preset installation sequence until a complete space special-shaped shell structure is formed.
  7. 7. The method of installing a roof truss according to claim 6, wherein the predetermined installation sequence of the roof truss with the large-span profiled shell structure is from one end to the other end of the space profiled shell structure or from the middle area to the two ends symmetrically.
  8. 8. The method of installing a cable according to claim 6, wherein the main rod member (2) is divided into at least two prefabricated rod sections (2.1) along the length direction, wherein a tongue-and-groove or a connecting plate for facilitating on-site butt joint is arranged at each section, and operating hand holes (4) for internal welding and/or bolt fastening are formed at corresponding positions of the side walls of the prefabricated rod sections (2.1).
  9. 9. The method according to claim 8, wherein the butt weld between the horizontal force plates is welded through the hand hole (4) when the primary rod (2) and the secondary rod (3) are prefabricated, and the cover plate (5) is covered at the hand hole (4) and welded and sealed after the welding is completed.

Description

Large-span mesh-shaped multi-cavity section steel special-shaped curved surface structure system and installation method thereof Technical Field The invention belongs to the technical field of civil engineering construction, and particularly relates to a large-span mesh-shaped multi-cavity profile steel special-shaped curved surface structure system and an installation method thereof. Background In the fields of contemporary large-span public buildings and industrial buildings, such as stadiums, transportation hubs, exhibition centers, large-scale workshops and the like, the requirements on roof structures are increasingly increased. These structures not only need to cover a wide column-free space to achieve a flexible and transparent building effect, but also pursue a unique and expressive special-shaped curved surface shape to meet building aesthetic and functional requirements. Currently, the main forms of realizing a large-span space structure include a grid structure, a net shell structure and a single-layer or double-layer shell structure formed by box-shaped section beams. Among them, a case structure composed of welded box-section bars (generally rectangular or square steel pipes) is widely used because of its excellent bending and torsion resistance. The structure is orderly connected in space through the rod pieces to form a stable curved surface shell. However, the prior art solutions with box section bars as basic units have significant limitations. First, the moment of inertia and torsional stiffness of a single closed-chamber box-shaped rod member are limited in bearing capacity when subjected to complex space stresses caused by ultra-large spans (e.g., spans exceeding 150 meters) or profiled curves. This directly results in a structure with a span that is difficult to break further or a rod with a large cross-sectional size or steel usage that has to be increased significantly in order to achieve a large span, which is less economical. Secondly, the structural grid (i.e., the shell structure cell) is often more densely divided, and the number of bars and nodes is numerous, limited by the bar bearing capacity. The method not only increases the workload of materials and welding, but also restricts the flexibility of the structural modeling, and is difficult to smoothly realize the free-form surface shape with large curvature change and irregularity, and the ideal modeling is often required to be compromised and simplified. Moreover, dense grids and nodes also affect the simplicity and the sense of penetration of the indoor vision of the building. Therefore, a novel large-span space structure system is needed, and the core stress rod piece of the novel large-span space structure system has higher bearing efficiency and rigidity on the premise of keeping reasonable steel consumption, so that a special-shaped shell structure with larger span and larger unit cell can be supported, and a larger design degree of freedom of building modeling is given. Disclosure of Invention The invention aims to provide a large-span mesh-shaped multi-cavity shaped steel special-shaped curved surface structure system and an installation method thereof, which are used for solving the technical problems that the bearing capacity of a shell structure formed by the existing box-shaped section rod piece is limited, the ultra-large span space coverage is difficult to realize economically and efficiently, the contradiction between the mechanical property and the molding freedom degree existing in the process of realizing complex, changeable and large-curvature special-shaped building molding is prominent, the molding is limited by the feasibility of the structure and is forced to be simplified, and the construction operability and quality control problems of the multi-cavity complex section rod piece in links such as segmentation, butt joint and internal welding are solved. In order to achieve the above purpose, the present invention adopts the following technical scheme. The large-span mesh-shaped multi-cavity section steel special-shaped curved surface structure system is arranged at the top of a supporting structure and comprises a main rod piece and a secondary rod piece, wherein the main rod piece and the secondary rod piece are respectively provided with a plurality of pieces; the secondary rod piece is connected between the main rod pieces and/or between the main rod pieces and the supporting structure; the main rod piece and the secondary rod piece are welded and connected to form a space special-shaped shell structure together; The main rod piece and the secondary rod piece comprise an upper flange plate, a lower flange plate, a left web plate, a right web plate and at least two horizontal stress plates which are arranged between the left web plate and the right web plate in parallel, and the left web plate and the right web plate are respectively welded and connected with the upper flange plate, the lower flange pl