String structure system of double-slope roof

Abstract

The invention discloses a string structure system of a double-pitched roof, comprising: an upper string rigid member comprising symmetrical rigid beams located on the left and right slopes of the double-pitched roof, the rigid beams on the two sides converge at one end to form a ridge, and the other ends of the rigid beams on the two sides are respectively supported on a support or a column; the lower chord herringbone cable is located below the upper chord rigid component and comprises two concave and symmetrical cable sections, one ends of the two cable sections are converged to form a herringbone vertex, and the other ends of the two cable sections are connected to the beam ends respectively; and the supporting rod assembly comprises a vertical central supporting rod connected between the ridge and the herringbone vertex and vertical side supporting rods connected between the rigid beam and the cable section, and the side supporting rods are distributed at intervals in the span direction of the roof and are in pairwise symmetry about the center. According to the system, the overall stability of the structure can be improved, the utilization efficiency of the internal space is improved, the appearance effect of the overall building is improved, and the applicability is wide.

Description

Technical Field

[0001] The invention relates to a roof structure, in particular to a string structure system of a double-slope roof. Background Art

[0002] Double-slope roofs are widely used in large-span buildings such as industrial plants and stadiums. When transferring loads, traditional double-slope roof structures generate large horizontal thrusts at the lower supports or columns due to the roof slope. This horizontal thrust causes the supports or columns to bear large shear forces, reducing material efficiency and increasing structural complexity and cost.

[0003] A cable-stayed structure is a self-balancing system that effectively balances horizontal thrust on the roof through the tensioning action of cables, reducing shear forces on supports and columns. However, existing cable-stayed structures for gable roofs typically utilize a single, underhung cable stretched directly across the roof span. This creates significant structural sag, which not only affects the building's aesthetics but also limits the efficient use of space.

[0004] Therefore, how to optimize the cable design to improve space utilization efficiency and aesthetics while maintaining the self-balancing advantages of the cable-stayed structure has become a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The purpose of the present invention is to provide a double-slope roof string structure system, which can improve the overall stability of the structure, increase the utilization efficiency of the internal space, enhance the overall appearance of the building, and has wide applicability.

[0006] The technical solution adopted in the present invention is: A string structure system for a double-slope roof comprises an upper-chord rigid member, a lower-chord herringbone cable and a strut assembly; the upper-chord rigid member comprises symmetrical rigid beams located on the left and right slopes of the double-slope roof, the two rigid beams converge at one end to form a roof ridge and are supported on supports or columns at the other ends; the lower-chord herringbone cable is located below the upper-chord rigid member and comprises two concave and symmetrical cable segments, the two cable segments converge at one end to form a herringbone vertex and are connected to beam ends at the other ends; the strut assembly comprises a vertical central strut connected between the roof ridge and the herringbone vertex and vertical side struts connected between the rigid beam and the cable segments, the side struts being spaced apart along the roof span direction and symmetrical in pairs about the center.

[0007] Preferably, the cable segment is in the shape of a concave parabola or circular arc.

[0008] Preferably, the slope of the cable segment from the end to the apex of the gable is designed according to the slope of the double-pitched roof. The greater the slope of the double-pitched roof, the greater the slope of the cable segment.

[0009] Preferably, the sag of the lower chord herringbone cable is set as the vertical distance from the ridge to the herringbone apex, and the sag of the lower chord herringbone cable is 1 / 20 to 1 / 8 of the span of the double-slope roof.

[0010] Preferably, the strut assembly further comprises a pair of V-shaped and symmetrical diagonal struts, wherein the lower ends of the diagonal struts are connected to the apex of the herringbone shape and the upper ends are connected to the rigid beam.

[0011] Preferably, the upper and lower ends of each strut of the strut assembly are hingedly connected, the upper end is hingedly connected to the bottom of the rigid beam, and the lower end is hingedly connected to the cable clamp of the cable segment.

[0012] Preferably, each strut of the strut assembly is made of round steel tube or I-beam.

[0013] Preferably, the lower end of each strut of the strut assembly is hinged to the cable clamp of the cable segment via an adjustable anchor.

[0014] Preferably, the rigid beam is a steel box beam, an H-shaped steel beam or a steel truss.

[0015] Preferably, the cable segments are made of high-strength steel strands, sealed high-vanadium cables or carbon fiber composite cables.

[0016] The beneficial effects of the present invention are: In this system, the upper chord rigid members, the lower chord herringbone cables, and the strut assembly together form a tensioned structure. The tensioning action of the lower chord herringbone cables effectively balances the horizontal thrust of the gable roof, reduces the shear force on the supports or columns, and improves the overall stability of the structure. Furthermore, compared to traditional, whole-length, down-hung cables, the lower chord herringbone cables significantly reduce sag, improving the efficiency of internal space utilization and making them suitable for architectural scenarios with high space requirements. Furthermore, the lower chord herringbone cables and the upper chord rigid members are both symmetrical, arched structures with a certain degree of appearance matching, conforming to architectural aesthetics and enhancing the overall appearance of the building. This system is not only suitable for new construction, but can also be used for the renovation, expansion, or reinforcement of existing buildings. It can also be combined with other structural forms to form a composite structural system, further expanding its application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 Schematic diagram of the string structure system of the gable roof in Example 1 of the present invention.

[0019] Figure 2This is a comparison diagram of a double-slope roof adopting the string structure system of the first embodiment of the present invention and a traditional string structure system. In the figure, the dotted line portion represents the traditional string structure system.

[0020] Figure 3 This is a comparison diagram of the structural deformation of a gable roof under the action of deadweight and prestressing when the gable roof does not adopt a tension-chord structure system, adopts a traditional tension-chord structure system, and adopts the tension-chord structure system in Example 1 of the present invention. The unit of the numbers in the figure is mm. In the figure, a) is not adopting a tension-chord structure system, b) is adopting a traditional tension-chord structure system, and c) is adopting the tension-chord structure system in Example 1 of the present invention.

[0021] Figure 4 This is a comparison diagram of the structural bending moments of a gable roof under the action of deadweight and prestressing when the gable roof does not adopt a tension-chord structure system, adopts a traditional tension-chord structure system, and adopts the tension-chord structure system in Example 1 of the present invention. The units used in the numbers in the figure are mm. In the figure, a) is not adopting a tension-chord structure system, b) is adopting a traditional tension-chord structure system, and c) is adopting the tension-chord structure system in Example 1 of the present invention.

[0022] Figure 5 Schematic diagram of the string structure system of the gable roof in the second embodiment of the present invention.

[0023] In the figure: 1-rigid beam; 2-column; 3-cable segment; 4-center support rod; 5-side support rod; 6-diagonal support rod; 7-support. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] The features and performance of the present application are further described in detail below with reference to the embodiments.

[0028] Example 1 This embodiment discloses a double-slope roof string structure system, such as Figure 1 As shown, it includes an upper chord rigid member, a lower chord herringbone cable and a strut assembly; the upper chord rigid member includes symmetrical rigid beams 1 located on the left and right slopes of the double-slope roof, the rigid beams 1 on both sides merge at one end to form a ridge, and are supported on columns 2 at the other end; the lower chord herringbone cable is located below the upper chord rigid member, and includes two concave and symmetrical cable segments 3, the two cable segments 3 merge at one end to form a herringbone vertex, and are connected to the beam ends at the other end; the strut assembly includes a vertical center strut 4 connected between the ridge and the herringbone vertex, vertical side struts 5 connected between the rigid beam 1 and the cable segments 3, and a pair of V-shaped and symmetrical diagonal struts 6, the side struts 5 are spaced apart along the roof span direction and are symmetrical about the center, the lower ends of the diagonal struts 6 are connected to the herringbone vertex, and the upper ends are connected to the rigid beam 1. In this system, the upper chord rigid members, the lower chord herringbone cables, and the strut assembly together form a tensioned structure. The tensioning action of the lower chord herringbone cables effectively balances the horizontal thrust of the gable roof, reduces the shear force on column 2, and improves the overall stability of the structure. Furthermore, compared to traditional, whole-length, down-hung cables, the lower chord herringbone cables significantly reduce sag, improving the efficiency of internal space utilization and making them suitable for architectural scenarios with high space requirements. Furthermore, the lower chord herringbone cables and the upper chord rigid members are both symmetrical structures with an upward arch, which has a certain degree of appearance matching, conforms to architectural aesthetics, and enhances the overall appearance of the building. This system is not only suitable for new construction, but can also be used for the renovation, expansion, or reinforcement of existing buildings. It can also be combined with other structural forms to form a composite structural system, further expanding its application scenarios.

[0029] The cable segment 3 may be in the form of a concave parabola or circular arc, and the specific shape may be adjusted according to the results of the simulation test.

[0030] The slope of cable segment 3 from the end to the apex of the gable is designed according to the slope of the double-pitched roof. The greater the slope of the double-pitched roof, the greater the slope of cable segment 3. This can provide a better tensioning effect on the one hand, and improve the appearance matching between the lower-chord gable cable and the upper-chord rigid component on the other hand.

[0031] Among them, the sag of the lower chord herringbone cable is set as the vertical distance from the ridge to the apex of the herringbone, and the sag of the lower chord herringbone cable is 1 / 20 to 1 / 8 of the span of the double-slope roof, thereby ensuring the stability of the structure and being able to adapt to double-slope roofs of different spans.

[0032] Among them, the upper and lower ends of each strut of the strut assembly are hinged, the upper end is hinged to the bottom of the rigid beam, and the lower end is hinged to the cable clamp of the cable segment 3, which is convenient for loading and unloading. In addition, the lower end of each strut of the strut assembly is hinged to the cable clamp of the cable segment 3 through an adjustable anchor, which is convenient for construction tensioning and prestressing adjustment.

[0033] In this embodiment, the span of the gable roof is 40m, the rigid beam 1 is 8m high from the bottom to the ridge, the column 2 is 12m high to the ground, and the roof gable is a concave curved surface; the rigid beam 1 can adopt structures such as steel box beams, H-shaped steel beams, and steel trusses. In this embodiment, the rigid beam 1 adopts a steel box beam with a cross-section of B600x300x20x20; the cable segment 3 can adopt structures such as high-strength steel strands, sealed high-vanadium cables, and carbon fiber composite cables. In this embodiment, the cable segment 3 adopts 1860MPa-grade high-vanadium cables with a diameter of 30mm; the struts of the strut assembly can be structures such as round steel tubes and I-beams. In this embodiment, the struts of the strut assembly adopt I-beams with a cross-section of P152x10.

[0034] like Figure 2 As shown, by comparing this embodiment with the traditional cable-stayed structure system, it can be seen that the sag of the lower-chord herringbone cable is 4.5m, and the vertical distance from the midpoint (lowest point) of the traditional whole-length down-hung cable to the roof ridge is 11m. It can be seen that the sag of the lower-chord herringbone cable is reduced by 59% compared with the traditional whole-length down-hung cable, and the space utilization rate is greatly improved.

[0035] like Figure 3 and Figure 4 As shown, by comparing the tension-string structure system without adopting the traditional tension-string structure system and the tension-string structure system of the present embodiment, it can be seen that: when the gable roof is not prestressed, the rigid beam 1 produces a large deformation, the lower supporting column 2 produces a large bending moment, and the rigid beam 1 also produces a large bending moment; under the action of prestress and deadweight, the tension-string structure system of the present embodiment produces a small vertical deformation of the rigid beam 1, the lower supporting column 2 produces a small bending moment, and the rigid beam 1 produces a small bending moment; compared with the traditional tension-string structure system, the tension-string structure system of the present embodiment produces smaller vertical deformation of the structure, smaller bending moment of the rigid beam 1, and smaller bending moment of the lower supporting column 2.

[0036] Example 2 This embodiment discloses another double-slope roof string structure system, such as Figure 5 As shown, the differences from Example 1 are as follows: 1) the rigid beam 1 is supported on supports 7; 2) the diagonal braces 6 are eliminated. In fact, both the columns 2 and supports 7 are common supporting members of the rigid beam 1. As for the diagonal braces 6, they can be added as needed to reinforce the vertices of the herringbone. The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

1. A string structure system for a double-slope roof, characterized in that: include: The upper chord rigid member includes symmetrical rigid beams located on the left and right slopes of the double-slope roof. The rigid beams on both sides converge at one end to form the ridge and are supported on supports or columns at the other end. The lower chord herringbone cable is located below the upper chord rigid member and consists of two concave and symmetrical cable segments. The two cable segments converge at one end to form a herringbone vertex and are connected to the beam ends at the other end. The support rod assembly includes a vertical central support rod connected between the ridge and the gable apex and vertical side support rods connected between the rigid beam and the cable segment. The side support rods are spaced apart along the roof span direction and are symmetrical about the center.

2. The string structure system of a double-slope roof according to claim 1, characterized in that: The cable segment is a concave parabola or circular arc.

3. The string structure system of a double-slope roof according to claim 1, characterized in that: The slope of the cable segment from the end to the gable apex is designed according to the slope of the double-slope roof. The greater the slope of the double-slope roof, the greater the slope of the cable segment.

4. The string structure system for a double-slope roof according to claim 1, characterized in that: The sag of the lower chord herringbone cable is set as the vertical distance from the ridge to the apex of the herringbone, and the sag of the lower chord herringbone cable is 1 / 20 to 1 / 8 of the span of the double slope roof.

5. The string structure system of a double-slope roof according to claim 1, characterized in that: The support rod assembly also includes a pair of V-shaped and symmetrical oblique support rods, the lower ends of the oblique support rods are connected to the apex of the herringbone shape, and the upper ends are connected to the rigid beam.

6. The string structure system for a double-slope roof according to claim 1 or 5, characterized in that: The upper and lower ends of each strut of the strut assembly are hinged, the upper end is hinged to the bottom of the rigid beam, and the lower end is hinged to the cable clamp of the cable segment.

7. The string structure system of a double-slope roof according to claim 6, characterized in that: The lower end of each strut of the strut assembly is hinged to the cable clamp of the cable segment through an adjustable anchor.

8. The string structure system for a double-slope roof according to claim 1 or 5, characterized in that: Each strut of the strut assembly is made of round steel pipe or I-steel.

9. The string structure system of a double-slope roof according to claim 1, characterized in that: The rigid beam adopts steel box beam, H-shaped steel beam or steel truss.

10. The string structure system of a double-slope roof according to claim 1, characterized in that: The cable segments are made of high-strength steel strands, sealed high-vanadium cables or carbon fiber composite cables.

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