JP7225514B2 - roof structure - Google Patents

Description

The present invention relates to roof construction.

US Pat. No. 6,200,005 describes a domed roof formed using radiating cables in which tension is induced.

JP-A-5-287811

In the domed roof of Patent Document 1, the radiating cable protrudes into the internal space at the peripheral edge of the roof, which may reduce the effective height of the space. In addition, in order to secure the effective height of the space, for example, it is necessary to raise the position of the opening edge of the building on which the roof is erected, which may extend the construction period and increase the construction cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a roof structure in which the effective height of the internal space can be easily secured.

A roof structure according to claim 1 comprises: a spherical roof structure formed by radially extending a plurality of frame members over an opening edge portion having a long axis and a short axis formed at an upper end portion of a lower structure; A plurality of ring-shaped string trusses that constitute the central part of the spherical roof frame and are arranged on concentric circles, and the outer peripheral part of the spherical roof frame, and diagonal members are arranged in the plane of the frame member. a perimeter truss formed by

In the roof structure of claim 1, a spherical roof frame is formed at the opening edge of the lower structure. A plurality of ring-shaped string trusses are concentrically arranged at the center of the spherical roof frame. Therefore, compared to a configuration in which a single string truss is arranged over the spherical roof frame, the string truss is divided and the total load of the string truss can be reduced. This makes it easy to secure the effective height of the internal space of the spherical roof frame.

In addition, on the outer periphery of the spherical roof structure, an outer truss is formed by arranging diagonal members in the plane of the frame member. Therefore, the rigidity for supporting the spherical roof structure can be ensured without arranging a string truss on the outer periphery. This makes it easier to secure the effective height of the internal space.

Additionally, the opening edge of the undercarriage has a major axis and a minor axis. For this reason, the thrust force acting on the outer peripheral portion of the spherical roof frame spanned over the opening edge is greater than, for example, when the opening edge is a perfect circle. However, since the outer peripheral truss is formed on the outer peripheral portion of the spherical roof frame, the rigidity of the outer peripheral portion is higher than that of a configuration in which the outer peripheral truss is not formed. As a result, deformation of the spherical roof frame due to thrust force can be suppressed.

A roof structure according to claim 2 comprises: a spherical roof structure formed by radially extending a plurality of frame members over an opening edge portion having a long axis and a short axis formed at the upper end of a lower structure; A plurality of ring-shaped string trusses that constitute the central part of the spherical roof frame and are arranged on concentric circles, and the outer peripheral part of the spherical roof frame, and diagonal members are arranged in the plane of the frame member. The string truss includes the frame member, an upper ring member formed in a ring shape by connecting the frame member, and a lower ring member provided below the upper ring member. A lower ring member formed in a ring shape, a bundle member connecting the upper ring member and the lower ring member, and a chord member connecting the lower ring member and the skeleton member, The chord members are arranged so as to cross each other.

In the roof structure of claim 2, the load acting on the frame members radially spanned by the own weight of the spherical roof frame is borne by the chord members via the bundle members. The tensile force of the string material is replaced by the compressive force of the upper ring material and the tensile force of the lower ring material to form a self-anchor structure. As a result, a columnless space with a high effective height can be formed below the spherical roof structure.

In addition, since the chord members are arranged so as to intersect each other, it is possible to suppress the deformation of the spherical roof frame due to the horizontal force acting during an earthquake.

The roof structure of claim 3 is the roof structure of claim 1 or claim 2, wherein the spherical roof frame is elliptical in plan view.

In the roof structure of claim 3, the spherical roof frame is elliptical in plan view. That is, the outer edge of the outer truss forming the outer periphery of the spherical roof frame is elliptical. As a result, the thrust force is smoothly transmitted from the center of the spherical roof frame toward the opening edge of the lower structure, compared to the case where the outer edge of the outer perimeter truss is rectangular, for example. Less likely to generate stress. Therefore, the structural stability is high. In addition, it is possible to make the roof structure excellent in design.

According to the roof structure according to the present invention, it is easy to secure the effective height of the internal space.

(A) is a vertical cross-sectional view showing a roof structure according to an embodiment of the present invention, and (B) is a vertical cross-sectional view showing a state in which the roof structure is disassembled. It is a top view showing the roof structure concerning the embodiment of the present invention. It is a perspective view showing the roof structure concerning the embodiment of the present invention. It is a conceptual diagram which shows the shape of the roof structure which concerns on embodiment of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the roof structure which concerns on this invention is described, referring drawings. Components shown using the same reference numerals in each drawing mean the same components. In addition, description may be abbreviate|omitted about the structure and code|symbol which overlap in each drawing. Moreover, the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the purpose of the present invention.

<Roof structure>
The roof structure according to the embodiment of the present invention, as shown in FIG. 1(A), is the structure of a roof frame 20 erected as a roof of a lower structure 10 such as a stadium. The roof frame 20 is formed with arch members 22 radially extending over an elliptical opening edge 10A (boundary portion between the lower structure 10 and the roof frame 20) formed in the lower structure 10 as a frame member. ing.

As shown in FIG. 1B and FIGS. 2 and 3, the central portion of the roof frame 20 is formed by arranging a plurality of ring-shaped string trusses 30 (string trusses 30A, 30B, and 30C) concentrically. ing. A truss structure (peripheral truss 40 ) is formed on the outer periphery of the roof frame 20 by arranging diagonal members 46 in the plane of the arch member 22 .

<Shape of roof structure>
The roof frame 20 is formed along the spherical surface Q shown in FIG. Specifically, the arch member 22 (see FIG. 3, etc.) is arranged on a curve L radially drawn along the spherical surface Q from a point O' on the spherical surface Q. As shown in FIG. Further, upper ring members 32A, 32B, 32C and an upper chord member 42, which will be described later, are arranged on curves C1, C2, C3, and C4 drawn along circles (concentric circles) centered at point O' on the spherical surface Q, respectively. It is Furthermore, the outer edge member 44, which will be described later, projects an ellipse E having the point O′ as the intersection of the major axis and the minor axis onto the spherical surface Q (projected from the point O′ along the center point O of the sphere forming the spherical surface Q). ) on the curve C5.

The arch member 22, the upper ring members 32A, 32B, 32C and the outer edge member 44 are formed by combining linear members. The expression that these members are "arranged on a curved line" means that the contact points (connecting points) of the linear members that form each member are arranged on the curved line.

In the present invention, "plan view" refers to a viewpoint when the roof frame 20 is viewed along the direction along the center point O of the sphere forming the spherical surface Q from the point O' on the spherical surface Q. The same applies to the term “planar view” in the following description.

<Strung string truss>
As shown in FIG. 1B, the string truss 30 is formed by combining string trusses 30A, 30B, and 30C.

The string truss 30A is formed with an arch member 22A, an upper ring member 32A, a lower ring member 34A, a bundle member 36A, a string member 38A and an upper ring member 32B.

The arch member 22A is the portion of the arch member 22 described above that is included in the string truss 30A. The upper end of the arch member 22A is connected to the upper ring member 32A. Also, the lower end of the arch member 22A is connected to the upper ring member 32B of the string truss 30B.

As shown in FIG. 3, the upper ring member 32A is a member formed in an annular shape, and connects the upper end portions of the arch members 22 adjacent to each other. A lower ring member 34A is arranged vertically below the upper ring member 32A. The upper ring member 32A and the lower ring member 34A are connected to each other by a bundle member 36A.

A chord member 38A connects the lower ring member 34A and the arch member 22A. Specifically, the string member 38A connects the connecting portion S1 of the lower ring member 34A to which the bundle member 36A is connected and the lower end portion S2 of the arch member 22A to which the upper ring member 32B is connected.

Further, as shown in FIG. 2, the chord member 38A extends from the connecting portion S1 in a direction intersecting with the arch member 22A, and extends two strings ahead (next to the next) along the circumferential direction of the upper ring member 32B. It is connected to the lower end S2 of a certain arch member 22A.

In FIGS. 2 and 3, the chord members 38A, 38B, and 38C are shown using broken lines so as to be easily distinguished from other configurations. Also, in FIG. 3, the chord members 38A, 38B, and 38C are partially drawn to simplify the illustration.

Furthermore, the string members 38A extend from the connecting portion S1 in two mutually intersecting directions, and each string member 38A is arranged to intersect another string member 38A in plan view.

As shown in FIG. 1B, the string truss 30B includes an arch member 22B, an upper ring member 32B, a lower ring member 34B, a bundle member 36B, a string member 38B, and an upper ring member 32C. formed with.

The arch member 22B is the portion of the arch member 22 described above that is included in the string truss 30B. The upper end of the arch member 22B is connected to the upper ring member 32B. Also, the lower end of the arch member 22B is connected to the upper ring member 32C of the string truss 30C.

As shown in FIG. 3, the upper ring member 32B is a member formed in an annular shape, and connects the upper end portions of the adjacent arch members 22B (the lower end portions of the arch members 22A). A lower ring member 34B is arranged vertically below the upper ring member 32B. The upper ring member 32B and the lower ring member 34B are connected to each other by a bundle member 36B.

A chord member 38B connects the lower ring member 34B and the arch member 22B. Specifically, the chord member 38B connects the connecting portion S3 of the lower ring member 34B to which the bundle member 36B is connected and the lower end portion S4 of the arch member 22B to which the upper ring member 32C is connected.

Further, as shown in FIG. 2, the chord member 38B extends from the connecting portion S3 in a direction intersecting with the arch member 22B, and extends from the arch member 38B one ahead (adjacent) along the circumferential direction of the upper ring member 32C. It is connected to the lower end portion S4 of the material 22B.

Furthermore, the string members 38B extend from the connection portion S3 in two mutually intersecting directions, and each string member 38B is arranged to intersect another string member 38B in plan view.

As shown in FIG. 1B, the string truss 30C includes an arch member 22C, an upper ring member 32C, a lower ring member 34C, a bundle member 36C, a string member 38C, and an upper string member 42 of the outer peripheral truss 40. and .

The arch member 22C is the portion of the arch member 22 described above that is included in the string truss 30C. The upper end of the arch member 22C is connected to the upper ring member 32C. Also, the lower end portion of the arch member 22C is connected to the upper chord member 42 .

As shown in FIG. 3, the upper ring member 32C is a member formed in an annular shape, and connects the upper end portions of the adjacent arch members 22C (the lower end portions of the arch members 22B). A lower ring member 34C is arranged vertically below the upper ring member 32C. The upper ring member 32C and the lower ring member 34C are connected to each other by a bundle member 36C.

A chord member 38C connects the lower ring member 34C and the arch member 22C. Specifically, the chord member 38C connects the connecting portion S5 to which the bundle member 36C is connected in the lower ring member 34C and the lower end portion S6 to which the upper chord member 42 of the outer peripheral truss 40 is connected in the arch member 22C. ing.

Furthermore, as shown in FIG. 2, the chord member 38C extends from the connecting portion S5 in a direction intersecting with the arch member 22C, and extends from the upper chord member 42 along the circumferential direction by one arch member (adjacent). 22C is connected to the lower end S6.

Furthermore, the string members 38C extend from the connection portion S5 in two mutually intersecting directions, and each string member 38C is arranged to intersect another string member 38C in plan view.

In the following description, the upper ring members 32A, 32B and 32C are collectively referred to as the upper ring member 32, the lower ring members 34A, 34B and 34C are collectively referred to as the lower ring member 34, the bundle members 36A, 36B and 36C may be collectively referred to as a bundle 36, and the chord materials 38A, 38B and 38C may be generically referred to as a chord material 38.

<Outer truss>
As shown in FIG. 1B, the outer truss 40 includes an arch member 22D, an upper chord member 42, and an outer edge member 44 as a lower chord member. A diagonal member 46 is provided.

The arch member 22D is a portion included in the outer truss 40 in the arch member 22 described above. The upper end of the arch member 22D is connected to the upper chord member 42. As shown in FIG. Also, the lower end of the arch member 22D is connected to the outer edge member 44. As shown in FIG.

The upper chord member 42 is a member formed in an annular shape, and connects the upper end portions of the adjacent arch members 22D (the lower end portions of the arch members 22C). No lower ring member is arranged vertically below the upper chord member 42 .

The outer edge member 44 has an elliptical shape in plan view as described above. For this reason, the length of the arch member 22D is not constant. The outer edge member 44 forms the outer edge of the outer truss 40 as well as the outer edge (peripheral edge) of the roof frame 20 .

The diagonal member 46 is arranged in the plane of the arch member 22D and spans from the intersection point of the arch member 22D and the upper chord member 42 to the intersection point of the adjacent arch member 22D and the outer edge member 44.

With the above configuration, the outer truss 40, which is a three-dimensional truss, is formed between the string truss 30 and the opening edge 10A of the lower structure 10. As shown in FIG.

<Action/effect>
In the roof structure according to the embodiment of the present invention, as shown in FIG. 1A, a spherical roof frame 20 is formed at the opening edge 10A of the lower structure 1-. A plurality of ring-shaped string trusses 30 (string trusses 30A, 30B, 30C) are concentrically arranged at the center of this spherical roof frame (inside the outer peripheral truss 40).

For this reason, compared to a configuration in which one string truss is arranged over a spherical roof frame, the string truss is divided, and the total load of the string truss can be reduced. This makes it easy to ensure the effective height of the internal space (lower space) of the roof frame 20 .

As shown in FIGS. 2 and 3, on the outer periphery of the roof frame 20 (outside the string truss 30), a diagonal member 46 is arranged in the plane of the arch member 22, which is a frame member, to form the outer truss 40. formed. Therefore, the rigidity for supporting the spherical roof frame 20 can be ensured without arranging a string truss on the outer peripheral portion of the roof frame 20 . This makes it easier to secure the effective height of the internal space.

Furthermore, the opening edge 10A (see FIG. 1) of the lower structure 10 has a major axis and a minor axis. For this reason, the thrust force acting on the outer peripheral portion of the roof frame 20 spanning the opening edge 10A is greater than, for example, when the opening edge 10A is a perfect circle.

However, since the outer peripheral truss 40 is formed on the outer peripheral portion of the roof frame 20, the rigidity of the outer peripheral portion is high as compared with a configuration in which the outer peripheral truss 40 is not formed. As a result, deformation of the roof frame 20 due to thrust force can be suppressed.

Further, the roof frame 20 has an elliptical shape in plan view. That is, the outer edge portion (outer edge member 44) of the outer peripheral truss 40 forming the outer peripheral portion of the roof frame 20 is elliptical. As a result, the thrust force is smoothly transmitted from the central portion of the roof frame 20 toward the opening edge portion 10A of the lower structure 10, compared to the case where the outer edge member 44 is, for example, rectangular or the like. is unlikely to occur. Therefore, the structural stability is high. In addition, it is possible to make the roof structure excellent in design.

In addition, in the roof structure according to the embodiment of the present invention, the load acting on the arch members 22 radially spanned by the own weight of the roof frame 20 is applied to the chord members 38 via the bundle members 36 of the string truss 30. bear. The tensile force of the chord member 38 is replaced by the compressive force of the upper ring member 32 and the tensile force of the lower ring member 34 to form a self-anchoring frame. As a result, a columnless space with a high effective height can be formed below the roof frame 20 .

The chord member 38 and the lower ring member 34 that bear the tensile force can be formed of shaped steel such as H-shaped steel and angle steel, and can also be formed of wire rods such as steel wire and carbon fiber.

Also, in the roof structure according to the embodiment of the present invention, the chord members 38 of each string truss 30 are arranged so as to cross each other. Therefore, it is possible to suppress the deformation of the roof frame 20 due to the horizontal force acting during an earthquake.

In addition, in the present embodiment, the opening edge portion 10A has an elliptical shape in plan view, but the embodiment of the present invention is not limited to this. For example, the opening edge portion 10A may be oval or rectangular in plan view. That is, any shape having a long axis and a short axis in a plan view may be used. In this case, the shape of the outer edge member 44 of the outer truss 40 is set to an oval shape, a rectangular shape, or the like, and the lengths of the arch members 22D and the diagonal members 46 are appropriately adjusted.

Even if the opening edge portion 10A has such a shape, since a plurality of ring-shaped string trusses 30 are arranged concentrically in the roof frame 20, the effective height of the internal space of the roof frame 20 can be easily secured. can be obtained.

Moreover, although the chord members 38 are arranged so as to intersect each other in the present embodiment, the embodiment of the present invention is not limited to this. That is, the chord members 38 can be arranged so that they do not cross each other. The strung string truss 30 can be a self-anchored frame without the string members 38 intersecting each other.

Moreover, in the present embodiment, the spherical surface Q along which the roof frame 20 is formed is a true sphere, but the embodiment of the present invention is not limited to this. For example, it can be an arbitrary three-dimensional shape such as a shape obtained by rotating an arbitrary parabola. Thus, the present invention can be implemented in various modes. In addition, each aspect can be used in combination as appropriate.

10 lower structure 10A opening edge 22 arch material (skeletal member)
20 Roof frame (spherical roof frame)
30 String truss 30A String truss 30B String truss 30C String truss 32 Upper ring member 32A Upper ring member 32B Upper ring member 32C Upper ring member 34 Lower ring member 34A Lower ring member 34B Lower ring member 34C Lower ring member 36 Bundle Material 36A Bundle 36B Bundle 36C Bundle 38 String 38A String 38B String 38C String 40 Perimeter truss 46 Diagonal member

Claims (3)

a spherical roof structure formed by radially extending a plurality of frame members over an opening edge portion having a long axis and a short axis formed at the upper end portion of the lower structure;
a plurality of ring-shaped strung string trusses that constitute the central portion of the spherical roof frame and are arranged concentrically;
an outer peripheral truss forming an outer peripheral portion of the spherical roof structure and formed by arranging diagonal members in the plane of the frame member;
roof structure with a spherical roof structure formed by radially extending a plurality of frame members over an opening edge portion having a long axis and a short axis formed at the upper end portion of the lower structure;
a plurality of ring-shaped strung string trusses that constitute the central portion of the spherical roof frame and are arranged concentrically;
an outer peripheral truss forming an outer peripheral portion of the spherical roof frame and formed by arranging diagonal members in the plane of the frame member;
has
The stringed truss is
the skeleton member;
an upper ring member formed in a ring shape by connecting the skeletal members;
a lower ring member provided below the upper ring member and formed in a ring shape;
a bundle material that connects the upper ring material and the lower ring material;
a string member connecting the lower ring member and the skeleton member;
A roof structure in which the chord members are arranged to cross each other. The spherical roof structure has an elliptical shape in plan view,
A roof structure according to claim 1 or claim 2.

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