A large-span roof structure

Abstract

This invention discloses a large-span roof structure, including a central roof structure (1) and peripheral roof structures connected thereto; the central roof structure adopts a membrane-truss-cable composite structure, and the peripheral roof structures adopt a plate-steel frame composite structure; the membrane-truss-cable composite structure includes a membrane structure, an upper truss unit, and a lower truss cable unit, and the plate-steel frame composite structure includes a roof panel structure and a steel frame structure; the outer periphery of the upper truss unit is fixedly connected to the roof panel structure, and the lower truss cable unit is connected to the steel frame structure; the upper truss unit includes a circumferential enclosing truss body, multiple sets of diagonally interlaced arch trusses, and upper diagonal reinforcing rods; the lower truss cable unit includes a lower circumferential enclosing truss body, multiple sets of diagonally interlaced trusses, lower diagonal reinforcing rods, and multiple cables. This invention can ensure that the large-span structure roof has a larger space, more diverse forms, less material usage, and stronger structural stability.

Description

Technical Field

[0001] This invention relates to the field of roof structure technology in building engineering, specifically to a large-span roof structure. Background Technology

[0002] With the rapid development of the national economy, people have increasingly higher demands for usable space in large public buildings such as stadiums and exhibition halls. Large-span spatial structures have become an important indicator of a country's or region's architectural technology level. Currently, large-span roof structures are categorized into space frame structures, membrane structures, space truss structures, and cable-stayed structures. Each of these structures has its own inherent problems. For example, space truss structures have advantages such as simple form, high rigidity, and convenient construction, but disadvantages such as relatively small usable spans and high steel consumption. Cable-stayed structures, on the other hand, have advantages such as relatively large usable spans, low steel consumption, and aesthetically pleasing designs, but also disadvantages such as low lateral stiffness under external forces like wind loads, poor stability, and the need to provide enormous horizontal tensile forces.

[0003] Furthermore, with social development and advancements in construction technology, people's demands for architecture have expanded beyond simply meeting basic survival and production needs. Higher-level requirements have emerged—aesthetically pleasing designs, economical practicality, and the ability to span larger spaces. The most significant aspect is increasing structural spans, moving towards ultra-large spans. Moreover, single roof forms are no longer sufficient for modern architecture, necessitating the development of diverse roof structures. With the development of large-span spatial structures, in recent years, there has been a demand for ultra-large span spatial structures exceeding 200 meters. However, current methods for combining various roof structures have limitations in terms of connection range and forms, particularly unsuitable for roof structures with large spans or other special structural features. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a large-span roof structure. This invention ensures that large-span roof structures in public buildings offer greater spatial flexibility, more diverse forms, less material usage, and stronger structural stability.

[0005] To achieve the above objectives, the present invention provides a large-span roof structure, including a central roof structure and peripheral roof structures connected thereto; the central roof structure adopts a membrane-truss-cable composite structure, and the peripheral roof structures adopt a plate-steel frame composite structure; the membrane-truss-cable composite structure, from top to bottom, includes a membrane structure, an upper truss unit, and a lower truss cable unit, and the plate-steel frame composite structure, from top to bottom, includes a roof panel structure and a steel frame structure; the outer periphery of the upper truss unit of the central roof structure is fixedly connected to the roof panel structure of the peripheral roof structure, and the lower truss cable unit is connected to the steel frame structure;

[0006] The upper truss unit includes a circumferential enclosing truss body, multiple sets of diagonally interlaced arch trusses, and upper diagonal reinforcing rods; the lower truss cable unit includes a lower circumferential enclosing truss body, multiple sets of diagonally interlaced trusses, lower diagonal reinforcing rods, and multiple cables.

[0007] Preferably, the central roof structure is olive-shaped along the longitudinal depth of the building and has an arc-shaped cover that is high in the middle and low around the edges in the vertical direction; multiple peripheral roof structures are located on the lateral sides of the central roof structure, and the roof panel structure is in the form of a flat plate.

[0008] In any of the above embodiments, it is preferred that the lower circumferential enclosing truss is arranged along the complete circumference of the lower part of the olive-shaped central roof structure, and multiple sets of diagonally intersecting trusses are arranged horizontally within the internal space of the lower circumferential enclosing truss, with the two ends of the multiple sets of diagonally intersecting trusses respectively fixed on the lower circumferential enclosing truss.

[0009] In any of the above embodiments, it is preferred that multiple longitudinal cables are arranged parallel to each other along the long axis of the olive shape, and multiple transverse cables are arranged parallel to each other along the short axis of the olive shape. The longitudinal cables and transverse cables intersect each other perpendicularly and connect adjacent diagonally staggered trusses and lower circumferential enclosing trusses respectively. Multiple lower diagonal reinforcing bars are respectively arranged between adjacent diagonally staggered trusses, lower circumferential enclosing trusses, longitudinal cables and transverse cables.

[0010] In any of the above embodiments, it is preferred that the upper circumferential enclosing truss is located directly above the lower circumferential enclosing truss and is arranged along the complete circumference of the arc-shaped, olive-shaped structure. The two ends of the multiple sets of diagonally intersecting arch trusses are respectively fixedly arranged on the upper circumferential enclosing truss. The upper circumferential enclosing truss and the lower circumferential enclosing truss are fixedly connected by a reinforcing truss.

[0011] In any of the above schemes, it is preferred that multiple upper diagonal reinforcing bars are provided between adjacent diagonally intersecting arch trusses and between diagonally intersecting arch trusses and the surrounding circumferential enclosing truss; the multiple sets of diagonally intersecting arch trusses and the multiple sets of diagonally intersecting trusses are set at opposite angles.

[0012] In any of the above schemes, it is preferred that the roof panel structure of the perimeter roof structure is in the form of an inclined plane, with the side connected to the central roof structure being the highest, the side connected to the adjacent perimeter roof structures being the second highest, and the other sides being the lowest.

[0013] In any of the above schemes, it is preferred that a reinforcing connection structure is provided at the connection position between the lower circumferential enclosing truss and the diagonal staggered truss. Each reinforcing connection structure can be connected to 5-8 connecting cables, and the other end of each connecting cable is connected to the side of the steel frame structure away from the lower truss cable unit.

[0014] In any of the above embodiments, it is preferred that the membrane structure adopts a three-layer structure, consisting of an insulating layer, a structural layer, and a protective layer from the outside to the inside. The insulating layer is made of polyvinylidene chloride and polyacrylate in a weight ratio of 1:1, the structural layer is made of polysulfonamide fiber, and the protective layer is made of thermoplastic polyurethane elastomer.

[0015] In any of the above options, it is preferred that the roof panel structure is assembled from precast reinforced concrete panels; and the steel frame structure is arranged as a whole along the horizontal plane.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. The central roof structure of this invention adopts a membrane-truss-cable composite structure, including a combination of upper and lower circumferential enclosing trusses, diagonally interlaced trusses, and diagonally interlaced arch trusses, and is further enhanced by multiple cables and diagonal reinforcing rods. This innovative composite structural system can fully utilize the structural effect, minimizing the amount of structural materials used while ensuring structural safety. It forms a circumferential structural whole bearing, which is more stable than the traditional point bearing method. This structure can fully bear vertical and horizontal loads as well as multi-directional support, thereby improving the overall stability, support strength, and torsional stiffness of the structure, and improving the distribution of internal forces.

[0018] 2. This invention combines the advantages of spatial truss roof structures, steel frame roofs, and cable roofs. By connecting and reinforcing the central and peripheral roof structures with connecting cables, it significantly increases the span of the building space, allowing the overall span of the roof structure to reach 260-300m. Simultaneously, it reduces the amount of steel used, effectively avoiding the defects of large public buildings with single-structure roofs, such as low lateral stiffness and poor stability under external loads like wind loads. Furthermore, it preserves the beautiful curves of the roof structure, greatly improving aesthetics.

[0019] 3. The large-span roof structure of the present invention has a high load-bearing capacity, is easy to construct and maintain, and can ensure that the large-span roof structure of public buildings has a larger space, more diverse forms, less material usage, and stronger structural stability.

[0020] 4. Compared with the prior art, the membrane structure of this invention has better weather resistance, UV resistance, flame retardancy, and mechanical properties; the polysulfonamide fiber used instead of the polyester or nylon cloth of the prior art has higher strength and lighter weight, less deformation under stress, and when used in combination with high-performance insulation and protective layers, it can improve the safety, design dimensions, and thermal insulation performance of building structures; the insulation layer has good weather resistance and self-cleaning function, effectively preventing the aging of internal materials; it can ensure the mechanical strength of the membrane structure and improve the material life.

[0021] 5. The large-span roof structure of this invention combines the advantages of space trusses, steel frames, membrane materials, and cables, pioneering a new type of large-span roof structure based on a composite spatial structure system. This composite spatial structure system fully utilizes the performance and advantages of each existing structure, improving the overall strength, stiffness, and stability while reducing the structure's self-weight and the amount of structural materials used. The membrane material of this invention has better weather resistance, UV resistance, flame retardancy, and mechanical properties than existing technologies. Brief description of the attached figures

[0022] Figure 1 This is an overall top view of the large-span roof structure according to the present invention;

[0023] Figure 2 This is an overall top view of the upper truss unit of the central roof structure of the large-span roof structure according to the present invention;

[0024] Figure 3 This is a perspective view of the central roof structure of the large-span roof structure according to the present invention.

[0025] Among them, 11-membrane structure, 12-lower circumferential enclosing truss body, 13-diagonal staggered truss body, 14-lower diagonal reinforcing rod, 15-longitudinal cable, 16-transverse cable, 17-reinforcing truss. Detailed Implementation

[0026] The technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. However, the following embodiments are only used to understand the present invention. The embodiments and features in the embodiments of this application can be combined with each other. This application can be implemented in a variety of different ways as defined and covered by the claims.

[0027] Example 1

[0028] See Figure 1-3 A large-span roof structure includes a central roof structure 1 and peripheral roof structures 2 connected thereto. The central roof structure 1 adopts a membrane-truss-cable composite structure, and the peripheral roof structure 2 adopts a plate-steel frame composite structure. The membrane-truss-cable composite structure consists of a membrane structure, an upper truss unit, and a lower truss cable unit from top to bottom. The plate-steel frame composite structure consists of a roof panel structure and a steel frame structure from top to bottom. The outer periphery of the upper truss unit of the central roof structure 1 is fixedly connected to the roof panel structure of the peripheral roof structure 2, and the lower truss cable unit is connected to the steel frame structure.

[0029] The upper truss unit includes a circumferential enclosing truss body 3, multiple sets of diagonally interlaced arch trusses 4, and an upper diagonal reinforcing rod 5; the lower truss cable unit includes a lower circumferential enclosing truss body, multiple sets of diagonally interlaced trusses, a lower diagonal reinforcing rod, and multiple cables.

[0030] The central roof structure 1 is shaped like an olive along the longitudinal depth of the building, and vertically it is an arc-shaped cover that is high in the middle and low around the edges; multiple peripheral roof structures 2 are located on the lateral sides of the central roof structure 1, and the roof panel structure is in the form of a flat plate.

[0031] The lower circumferential enclosing truss is set along the complete circumference of the lower part of the olive-shaped central roof structure 1. Multiple sets of diagonally intersecting trusses are horizontally set in the internal space of the lower circumferential enclosing truss, and the two ends of the multiple sets of diagonally intersecting trusses are respectively fixed on the lower circumferential enclosing truss.

[0032] Multiple longitudinal cables are arranged parallel to each other along the long axis of the olive shape, and multiple transverse cables are arranged parallel to each other along the short axis of the olive shape. The longitudinal and transverse cables intersect each other perpendicularly and connect adjacent diagonally staggered trusses and lower circumferential enclosing trusses respectively. Multiple lower diagonal reinforcing rods are respectively arranged between adjacent diagonally staggered trusses, lower circumferential enclosing trusses, longitudinal cables and transverse cables.

[0033] The upper circumferential enclosing truss 3 is located directly above the lower circumferential enclosing truss and is set along the complete circumference of the arc-shaped, olive-shaped structure. The two ends of multiple sets of diagonally intersecting arch trusses 4 are respectively fixed on the upper circumferential enclosing truss 3. The upper circumferential enclosing truss 3 and the lower circumferential enclosing truss are fixedly connected by a reinforcing truss.

[0034] Multiple upper diagonal reinforcing rods 5 are installed between adjacent diagonally intersecting arch truss bodies 4 and between diagonally intersecting arch truss bodies 4 and the upper surrounding truss body 3; the angles of the multiple sets of diagonally intersecting arch truss bodies 4 and the multiple sets of diagonally intersecting trusses are opposite.

[0035] The roof panel structure of the peripheral roof structure 2 is in the form of a sloping plane. The side that connects to the central roof structure 1 is the highest, the side that connects to the adjacent peripheral roof structures 2 is the second highest, and the other sides are the lowest.

[0036] At the connection points between the circumferential enclosing truss and the diagonally intersecting truss, there are also reinforced connection structures. Each reinforced connection structure can be connected to 5 connecting cables. The other end of each connecting cable is connected to the side of the steel frame structure away from the lower truss cable unit.

[0037] The membrane structure adopts a three-layer structure, consisting of an isolation layer, a structural layer, and a protective layer from the outside to the inside. The isolation layer is made of polyvinylidene chloride and polyacrylate in a weight ratio of 1:1, the structural layer is made of polysulfonamide fiber, and the protective layer is made of thermoplastic polyurethane elastomer.

[0038] The roof panel structure is assembled from precast reinforced concrete panels; the steel frame structure is arranged as a whole along the horizontal plane.

[0039] Example 2

[0040] See Figure 1-3 A large-span roof structure includes a central roof structure 1 and peripheral roof structures 2 connected thereto. The central roof structure 1 adopts a membrane-truss-cable composite structure, and the peripheral roof structure 2 adopts a plate-steel frame composite structure. The membrane-truss-cable composite structure consists of a membrane structure, an upper truss unit, and a lower truss cable unit from top to bottom. The plate-steel frame composite structure consists of a roof panel structure and a steel frame structure from top to bottom. The outer periphery of the upper truss unit of the central roof structure 1 is fixedly connected to the roof panel structure of the peripheral roof structure 2, and the lower truss cable unit is connected to the steel frame structure.

[0041] The upper truss unit includes a circumferential enclosing truss body 3, multiple sets of diagonally interlaced arch trusses 4, and an upper diagonal reinforcing rod 5; the lower truss cable unit includes a lower circumferential enclosing truss body, multiple sets of diagonally interlaced trusses, a lower diagonal reinforcing rod, and multiple cables.

[0042] The central roof structure 1 is shaped like an olive along the longitudinal depth of the building, and vertically it is an arc-shaped cover that is high in the middle and low around the edges; multiple peripheral roof structures 2 are located on the lateral sides of the central roof structure 1, and the roof panel structure is in the form of a flat plate.

[0043] The lower circumferential enclosing truss is set along the complete circumference of the lower part of the olive-shaped central roof structure 1. Multiple sets of diagonally intersecting trusses are horizontally set in the internal space of the lower circumferential enclosing truss, and the two ends of the multiple sets of diagonally intersecting trusses are respectively fixed on the lower circumferential enclosing truss.

[0044] Multiple longitudinal cables are arranged parallel to each other along the long axis of the olive shape, and multiple transverse cables are arranged parallel to each other along the short axis of the olive shape. The longitudinal and transverse cables intersect each other perpendicularly and connect adjacent diagonally staggered trusses and lower circumferential enclosing trusses respectively. Multiple lower diagonal reinforcing rods are respectively arranged between adjacent diagonally staggered trusses, lower circumferential enclosing trusses, longitudinal cables and transverse cables.

[0045] The upper circumferential enclosing truss 3 is located directly above the lower circumferential enclosing truss and is set along the complete circumference of the arc-shaped, olive-shaped structure. The two ends of multiple sets of diagonally intersecting arch trusses 4 are respectively fixed on the upper circumferential enclosing truss 3. The upper circumferential enclosing truss 3 and the lower circumferential enclosing truss are fixedly connected by a reinforcing truss.

[0046] Multiple upper diagonal reinforcing rods 5 are installed between adjacent diagonally intersecting arch truss bodies 4 and between diagonally intersecting arch truss bodies 4 and the upper surrounding truss body 3; the angles of the multiple sets of diagonally intersecting arch truss bodies 4 and the multiple sets of diagonally intersecting trusses are opposite.

[0047] The roof panel structure of the peripheral roof structure 2 is in the form of a sloping plane. The side that connects to the central roof structure 1 is the highest, the side that connects to the adjacent peripheral roof structures 2 is the second highest, and the other sides are the lowest.

[0048] At the connection points between the circumferential enclosing truss and the diagonally intersecting truss, there are also reinforced connection structures. Each reinforced connection structure can be connected to 8 connecting cables. The other end of each connecting cable is connected to the side of the steel frame structure away from the lower truss cable unit.

[0049] The membrane structure adopts a three-layer structure, consisting of an isolation layer, a structural layer, and a protective layer from the outside to the inside. The isolation layer is made of polyvinylidene chloride and polyacrylate in a weight ratio of 1:1, the structural layer is made of polysulfonamide fiber, and the protective layer is made of thermoplastic polyurethane elastomer.

[0050] The roof panel structure is assembled from precast reinforced concrete panels; the steel frame structure is arranged as a whole along the horizontal plane.

[0051] Furthermore, in order to further improve the technical effect of the present invention, in this embodiment, each set of obliquely intersecting arch truss bodies 4 and obliquely intersecting truss bodies are set at 45° with the short axis of the olive shape.

[0052] The precast reinforced concrete slab includes an exterior decorative panel, a first vibration isolation pad, a foamed cement structural layer, a second vibration isolation pad, and a light steel frame. The first vibration isolation pad is placed between the exterior decorative panel and the foamed cement structural layer, and the second vibration isolation pad is placed between the foamed cement structural layer and the light steel frame. The foamed cement structural layer comprises three layers, with horizontal steel mesh laid flat between adjacent layers. Multiple evenly spaced vertical steel meshes are also placed within the foamed cement structural layer, with the horizontal and vertical steel meshes arranged perpendicularly. Multiple fiber filaments are arranged on the surfaces of the first and second vibration isolation pads facing the foamed cement structural layer.

[0053] During prefabrication, an outer decorative panel is placed in a mold with its back facing upwards. A first vibration-damping pad is then placed on its back, with the fibers of the first vibration-damping pad facing upwards. Next, a first layer of foamed cement is poured, and pre-installed horizontal and vertical reinforcing meshes are inserted. At this point, half the thickness of the lower layer of horizontal reinforcing mesh is submerged in the first layer of foamed cement. After the first layer of foamed cement has initially set, a second layer of foamed cement is poured, the pouring height ensuring that the surface of the second layer submerges half the thickness of the upper layer of horizontal reinforcing mesh. After the second layer of foamed cement has initially set, a third layer of foamed cement is poured, and a second vibration-damping pad is laid on its surface, with multiple fibers of the second vibration-damping pad in contact with the third layer of foamed cement. After the foamed cement structural layer has completely solidified, a light steel frame is fixed onto the second vibration-damping pad, thus completing the fabrication of the precast reinforced concrete slab.

[0054] The roof panel structure of this invention greatly improves the sound insulation and earthquake resistance of the roof, while also making installation more convenient and the structure more practical. The multi-layer structure gives it advantages such as being lightweight, high-strength, and having a low thermal conductivity, which greatly improves the composite performance of the roof panel structure and facilitates its widespread application.

[0055] Example 3

[0056] See Figure 1-3 A large-span roof structure includes a central roof structure 1 and peripheral roof structures 2 connected thereto. The central roof structure 1 adopts a membrane-truss-cable composite structure, and the peripheral roof structure 2 adopts a plate-steel frame composite structure. The membrane-truss-cable composite structure consists of a membrane structure, an upper truss unit, and a lower truss cable unit from top to bottom. The plate-steel frame composite structure consists of a roof panel structure and a steel frame structure from top to bottom. The outer periphery of the upper truss unit of the central roof structure 1 is fixedly connected to the roof panel structure of the peripheral roof structure 2, and the lower truss cable unit is connected to the steel frame structure.

[0057] The upper truss unit includes a circumferential enclosing truss body 3, multiple sets of diagonally interlaced arch trusses 4, and an upper diagonal reinforcing rod 5; the lower truss cable unit includes a lower circumferential enclosing truss body, multiple sets of diagonally interlaced trusses, a lower diagonal reinforcing rod, and multiple cables.

[0058] The central roof structure 1 is shaped like an olive along the longitudinal depth of the building, and vertically it is an arc-shaped cover that is high in the middle and low around the edges; multiple peripheral roof structures 2 are located on the lateral sides of the central roof structure 1, and the roof panel structure is in the form of a flat plate.

[0059] The lower circumferential enclosing truss is set along the complete circumference of the lower part of the olive-shaped central roof structure 1. Multiple sets of diagonally intersecting trusses are horizontally set in the internal space of the lower circumferential enclosing truss, and the two ends of the multiple sets of diagonally intersecting trusses are respectively fixed on the lower circumferential enclosing truss.

[0060] Multiple longitudinal cables are arranged parallel to each other along the long axis of the olive shape, and multiple transverse cables are arranged parallel to each other along the short axis of the olive shape. The longitudinal and transverse cables intersect each other perpendicularly and connect adjacent diagonally staggered trusses and lower circumferential enclosing trusses respectively. Multiple lower diagonal reinforcing rods are respectively arranged between adjacent diagonally staggered trusses, lower circumferential enclosing trusses, longitudinal cables and transverse cables.

[0061] The upper circumferential enclosing truss 3 is located directly above the lower circumferential enclosing truss and is set along the complete circumference of the arc-shaped, olive-shaped structure. The two ends of multiple sets of diagonally intersecting arch trusses 4 are respectively fixed on the upper circumferential enclosing truss 3. The upper circumferential enclosing truss 3 and the lower circumferential enclosing truss are fixedly connected by a reinforcing truss.

[0062] Multiple upper diagonal reinforcing rods 5 are installed between adjacent diagonally intersecting arch truss bodies 4 and between diagonally intersecting arch truss bodies 4 and the upper surrounding truss body 3; the angles of the multiple sets of diagonally intersecting arch truss bodies 4 and the multiple sets of diagonally intersecting trusses are opposite.

[0063] The roof panel structure of the peripheral roof structure 2 is in the form of a sloping plane. The side that connects to the central roof structure 1 is the highest, the side that connects to the adjacent peripheral roof structures 2 is the second highest, and the other sides are the lowest.

[0064] At the connection points between the circumferential enclosing truss and the diagonally intersecting truss, there are also reinforced connection structures. Each reinforced connection structure can be connected to 7 connecting cables. The other end of each connecting cable is connected to the side of the steel frame structure away from the lower truss cable unit.

[0065] The membrane structure adopts a three-layer structure, consisting of an isolation layer, a structural layer, and a protective layer from the outside to the inside. The isolation layer is made of polyvinylidene chloride and polyacrylate in a weight ratio of 1:1, the structural layer is made of polysulfonamide fiber, and the protective layer is made of thermoplastic polyurethane elastomer.

[0066] The roof panel structure is assembled from precast reinforced concrete panels; the steel frame structure is arranged as a whole along the horizontal plane.

[0067] Furthermore, to further enhance the technical effect of the present invention, in this embodiment, multiple snap-fit ​​nesting seats are welded to the outer periphery of the upper truss unit and the outer periphery of the lower truss cable unit of the central roof structure 1. Multiple snap-fit ​​protrusions are provided on the outer side of the roof panel structure and the outer side of the steel frame structure of the peripheral roof structure 2. Through the cooperation of the snap-fit ​​nesting seats and the snap-fit ​​protrusions, and with the insertion of fastening bolts, a rapid and stable connection between the central roof structure 1 and the peripheral roof structure 2 can be achieved. After connection, welding can be performed at the corresponding connection positions between the central roof structure 1 and the peripheral roof structure 2 to further improve the strength and stability of the connection.

[0068] With this setup, the central roof structure 1 and the surrounding roof structure 2 can achieve a fast, stable, and fully nested connection. The connection and fixation effect is better, and the connection range is larger. It can be applied to large-span and multi-structural combination roof layer structures, greatly improving the application range and construction efficiency.

[0069] As can be seen from the above embodiments, the central roof structure of the present invention adopts a membrane-truss-cable composite structure, including a combination of upper and lower circumferential enclosing trusses, diagonally intersecting trusses, and diagonally intersecting arch trusses, and is equipped with multiple cables and diagonal reinforcing rods, etc. The innovative composite structural system can give full play to the structural effect, and minimize the amount of structural materials used while ensuring structural safety; it forms a circumferential structure with overall stress, which is more stable than the traditional point stress method; the structure can fully bear vertical and horizontal loads and multi-directional support, thereby improving the overall stability, support strength and torsional stiffness of the structure, and improving the internal force distribution.

[0070] This invention combines the advantages of spatial truss roof structures, steel frame roofs, and cable roofs. By connecting and reinforcing the central and peripheral roof structures with connecting cables, it significantly increases the span of the building space, allowing the overall span of the roof structure to reach 260-300m. At the same time, it reduces the amount of steel used, effectively avoiding the defects of large public buildings with single-structure roofs, such as low lateral stiffness and poor stability under external loads such as wind loads. It also retains the beautiful curves of the roof structure, greatly improving aesthetics.

[0071] The large-span roof structure of the present invention has a high load-bearing capacity, is easy to construct and maintain, and can ensure that the large-span roof structure of public buildings has a larger space, more diverse forms, less material usage, and stronger structural stability.

[0072] Compared to existing technologies, the membrane structure of this invention exhibits superior weather resistance, UV resistance, flame retardancy, and mechanical properties. The use of polysulfonamide fibers instead of polyester or nylon fabric provides higher strength and lighter weight, with less deformation under stress. Combined with high-performance insulation and protective layers, it enhances the safety, dimensional stability, and thermal insulation performance of the building structure. The insulation layer possesses excellent weather resistance and self-cleaning properties, effectively preventing the aging of internal materials. This ensures the mechanical strength of the membrane structure and extends its lifespan. Furthermore, this invention utilizes a single integrated construction device to achieve lifting support, excavation, and erection functions, significantly saving manpower, improving the reliability of excavation and erection, and preventing tilting of the support columns due to uneven clamping force, thus greatly improving construction efficiency.

[0073] This invention combines the advantages of space trusses, steel frames, membrane materials, and cables to create a new type of large-span roof structure based on a composite spatial structure system. This composite spatial structure system fully leverages the performance and advantages of each existing structure, improving the overall strength, stiffness, and stability while reducing the structure's self-weight and the amount of structural materials used. Furthermore, the membrane material of this invention exhibits better weather resistance, UV resistance, flame retardancy, and mechanical properties compared to existing technologies.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A large-span roof structure, characterized in that, It includes a central roof structure (1) and a peripheral roof structure (2) connected to it; the central roof structure (1) adopts a membrane-truss-cable composite structure, and the peripheral roof structure (2) adopts a plate-steel frame composite structure; the membrane-truss-cable composite structure includes a membrane structure, an upper truss unit and a lower truss cable unit from top to bottom, and the plate-steel frame composite structure includes a roof panel structure and a steel frame structure from top to bottom; the outer periphery of the upper truss unit of the central roof structure (1) is fixedly connected to the roof panel structure of the peripheral roof structure (2), and the lower truss cable unit is connected to the steel frame structure; The upper truss unit includes a circumferential enclosing truss body (3), multiple sets of diagonally intersecting arch trusses (4), and an upper diagonal reinforcing rod (5); the lower truss cable unit includes a lower circumferential enclosing truss body, multiple sets of diagonally intersecting trusses, a lower diagonal reinforcing rod, and multiple cables.

2. The large-span roof structure according to claim 1, characterized in that, The central roof structure (1) is shaped like an olive along the longitudinal depth of the building and is an arc-shaped cover that is high in the middle and low around the edges in the vertical direction; multiple peripheral roof structures (2) are located on the horizontal sides of the central roof structure (1), and the roof panel structure is in the form of a flat plate.

3. The large-span roof structure according to claim 1, characterized in that, The lower circumferential enclosing truss is set along the complete circumferential direction of the lower part of the olive-shaped central roof structure (1). Multiple sets of diagonally intersecting trusses are horizontally set in the internal space of the lower circumferential enclosing truss. The two ends of the multiple sets of diagonally intersecting trusses are respectively fixed on the lower circumferential enclosing truss.

4. The large-span roof structure according to claim 3, characterized in that, Multiple longitudinal cables are arranged parallel to each other along the long axis of the olive shape, and multiple transverse cables are arranged parallel to each other along the short axis of the olive shape. The longitudinal and transverse cables intersect each other perpendicularly and connect adjacent diagonally staggered trusses and lower circumferential enclosing trusses respectively. Multiple lower diagonal reinforcing rods are respectively arranged between adjacent diagonally staggered trusses, lower circumferential enclosing trusses, longitudinal cables and transverse cables.

5. The large-span roof structure according to claim 2 or 4, characterized in that, The upper surrounding truss (3) is located directly above the lower surrounding truss and is set along the complete circumference of the arc-shaped olive shape. The two ends of multiple sets of diagonally intersecting arch trusses (4) are respectively fixed on the upper surrounding truss (3). The upper surrounding truss (3) and the lower surrounding truss are fixedly connected by a reinforcing truss.

6. The large-span roof structure according to claim 5, characterized in that, Multiple upper diagonal reinforcing rods (5) are provided between adjacent diagonally intersecting arch trusses (4) and between diagonally intersecting arch trusses (4) and the upper surrounding truss (3); the angles of the multiple sets of diagonally intersecting arch trusses (4) and the multiple sets of diagonally intersecting trusses are opposite.

7. The large-span roof structure according to claim 6, characterized in that, The roof panel structure of the perimeter roof structure (2) is in the form of a sloping plane. The side that connects to the central roof structure (1) is the highest, the side that connects to the adjacent perimeter roof structure (2) is the second highest, and the other sides are the lowest.

8. The large-span roof structure according to claim 1, characterized in that, At the connection points between the circumferential enclosing truss and the diagonally intersecting truss, there are also reinforced connection structures. Each reinforced connection structure can be connected to 5-8 connecting cables. The other end of each connecting cable is connected to the side of the steel frame structure away from the lower truss cable unit.

9. The large-span roof structure according to claim 8, characterized in that, The membrane structure adopts a three-layer structure, consisting of an isolation layer, a structural layer, and a protective layer from the outside to the inside. The isolation layer is made of polyvinylidene chloride and polyacrylate in a weight ratio of 1:1, the structural layer is made of polysulfonamide fiber, and the protective layer is made of thermoplastic polyurethane elastomer.

10. The large-span roof structure according to claim 9, characterized in that, The roof panel structure is assembled from precast reinforced concrete panels; the steel frame structure is arranged as a whole along the horizontal plane.

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