JP2020133328A - Roof structure - Google Patents

Abstract

To provide a roof structure capable of easily securing effective height of an inside space.SOLUTION: A roof structure includes: a spherical roof frame (a roof frame 20) formed by radially bridging a plurality of skeleton members (arch materials 22) on an open edge portion 10A which is formed at an upper end portion of a lower structure 10 and which has a long axis and a short axis; a plurality of ring-like tensioned chord trusses 30 constituting a center portion of the spherical roof frame and disposed on concentric circles; and an outer circumferential truss 40 constituting an outer peripheral portion of the spherical roof frame and formed by disposing diagonal members in a plane of the skeleton members.SELECTED DRAWING: Figure 1

Description

The present invention relates to a roof structure.

Patent Document 1 below describes a dome-shaped roof formed by using a radiating cable into which tension has been introduced.

Japanese Unexamined Patent Publication No. 5-287811

In the dome-type roof of Patent Document 1, the radiation cable may protrude into the internal space at the peripheral edge of the roof, and the effective height of the space may be lowered. Further, 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 or increase the construction cost.

An object of the present invention is to provide a roof structure in which an effective height of an internal space can be easily secured in consideration of the above facts.

The roof structure of claim 1 includes a spherical roof frame formed by radially bridging a plurality of skeleton members at an opening edge having a long axis and a short axis formed at the upper end of the lower structure, and the above-mentioned. A central portion of the spherical roof frame is formed, a plurality of ring-shaped chord trusses arranged concentrically, and an outer peripheral portion of the spherical roof frame are formed, and diagonal members are arranged in the plane of the skeleton member. It has an outer peripheral truss formed by the roof.

In the roof structure of claim 1, a spherical roof frame is formed at the opening edge of the lower structure. At the center of this spherical roof frame, a plurality of ring-shaped chord trusses are arranged concentrically. Therefore, as compared with the configuration in which one string truss is arranged over the spherical roof frame, the string truss is divided and the cause of the entire string truss can be lowered. As a result, it is easy to secure the effective height of the internal space of the spherical roof frame.

Further, on the outer peripheral portion of the spherical roof frame, an outer peripheral truss is formed by arranging diagonal members in the plane of the skeleton member. Therefore, it is possible to secure the rigidity to support the spherical roof frame without arranging the string truss on the outer peripheral portion. As a result, it is easier to secure the effective height of the internal space.

Further, the opening edge of the substructure is provided with a major axis and a minor axis. Therefore, for example, the thrust force acting on the outer peripheral portion of the spherical roof frame spanning the opening edge portion is larger than that in the case where the opening edge portion 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 in the 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.

The roof structure of claim 2 is the roof structure of claim 1, wherein the chord truss is composed of the skeleton member, the upper ring material formed by connecting the skeleton members in a ring shape, and the upper ring material. A lower ring material provided below and formed in a ring shape, a bundle material for connecting the upper ring material and the lower ring material, and a chord material for connecting the lower ring material and the skeleton member are provided. The chord members are arranged so as to intersect each other.

In the roof structure of claim 2, the load acting on the skeleton members radially laid by the weight of the spherical roof frame is borne by the chord member via the bundle member. The tensile force of the chord material is replaced by the compressive force of the upper ring material and the tensile force of the lower ring material, resulting in a self-anchor type frame. As a result, a pillar-free space with a high effective height can be formed below the spherical roof frame.

Further, 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 2, wherein the spherical roof frame has an elliptical shape in a plan view.

In the roof structure of claim 3, the spherical roof frame has an elliptical shape in a plan view. That is, the outer edge portion of the outer peripheral truss forming the outer peripheral portion of the spherical roof frame has an elliptical shape. As a result, the thrust force is smoothly transmitted from the center of the spherical roof frame toward the opening edge of the substructure, as compared with the case where the outer edge of the outer peripheral truss is rectangular, for example, and the thrust force is locally concentrated. Stress is unlikely to occur. Therefore, the structural stability is high. In addition, a roof structure with excellent design can be obtained.

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

Hereinafter, embodiments of the roof structure according to the present invention will be described with reference to the drawings. The components shown by using the same reference numerals in each drawing mean that they are the same components. The description of overlapping configurations and symbols in the drawings may be omitted. Further, the present invention is not limited to the following embodiments, and can be carried out with appropriate modifications within the scope of the object of the present invention.

<Roof structure>
As shown in FIG. 1A, the roof structure according to the embodiment of the present invention is a 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 an arch member 22 radially straddled over an opening edge portion 10A (a boundary portion between the lower structure 10 and the roof frame 20) formed in an elliptical shape in the lower structure 10 as a skeleton member. ing.

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

<Shape of roof frame>
The roof frame 20 is formed along the spherical surface Q shown in FIG. Specifically, the arch member 22 (see FIG. 3 and the like) is arranged on a curve L drawn radially along the spherical surface Q from the point O'on the spherical surface Q. Further, the upper ring members 32A, 32B, 32C and the upper chord member 42, which will be described later, are arranged on the curves C1, C2, C3 and C4 drawn along a circle (concentric circle) centered on the point O'on the spherical surface Q, respectively. Has been done. Further, the outer edge member 44, which will be described later, projects an ellipse E having the point O'as the intersection of the long axis and the short axis on the spherical surface Q (projected along the center point O of the sphere forming the spherical surface Q from the point O'. ) Is arranged on the curved line C5.

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

Further, the "planar view" in the present invention 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.

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

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

The arch material 22A is a portion of the arch material 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. Further, the lower end portion 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. Further, the lower ring material 34A is arranged in the vertically downward direction of the upper ring material 32A. The upper ring member 32A and the lower ring member 34A are connected to each other by a bundle member 36A.

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

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

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

Further, the chord member 38A extends from the connecting portion S1 in two directions intersecting each other, and each chord member 38A is arranged so as to intersect with another chord member 38A in a plan view.

As shown in FIG. 1B, the string truss 30B includes an arch material 22B, an upper ring material 32B, a lower ring material 34B, a bundle material 36B, a chord material 38B, and an upper ring material 32C. Formed in preparation.

The arch material 22B is a portion of the arch material 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. Further, the lower end portion 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 ends of the arch members 22B adjacent to each other (the lower ends of the arch members 22A). Further, the lower ring material 34B is arranged in the vertically downward direction of the upper ring material 32B. The upper ring member 32B and the lower ring member 34B are connected to each other by a bundle member 36B.

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

Further, as shown in FIG. 2, the chord member 38B extends from the connecting portion S3 toward the intersection with the arch member 22B, and is one arch 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.

Further, the chord member 38B extends from the connecting portion S3 in two directions intersecting each other, and each chord member 38B is arranged so as to intersect with another chord member 38B in a plan view.

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

The arch material 22C is a portion included in the string truss 30C in the arch material 22 described above. The upper end of the arch member 22C is connected to the upper ring member 32C. Further, 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 ends of the arch members 22C adjacent to each other (the lower ends of the arch members 22B). Further, the lower ring material 34C is arranged in the vertically downward direction of the upper ring material 32C. The upper ring member 32C and the lower ring member 34C are connected to each other by a bundle member 36C.

The 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.

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

Further, the chord member 38C extends from the connecting portion S5 in two directions intersecting each other, and each chord member 38C is arranged so as to intersect with another chord member 38C in a plan view.

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

<Outer circumference truss>
The outer peripheral truss 40 includes an arch member 22D, an upper chord member 42, and an outer edge member 44 as a lower chord member as shown in FIG. 1 (B), and further, as shown in FIGS. It is provided with a diagonal member 46.

The arch material 22D is a portion of the above-mentioned arch material 22 included in the outer peripheral truss 40. The upper end of the arch member 22D is connected to the upper chord member 42. Further, the lower end portion of the arch member 22D is connected to the outer edge member 44.

The upper chord member 42 is a member formed in an annular shape, and connects the upper ends of the arch members 22D adjacent to each other (the lower ends of the arch members 22C). The lower ring member is not arranged in the vertical direction of the upper chord member 42.

As described above, the outer edge member 44 has an elliptical shape in a plan view. Therefore, the length of the arch member 22D is not constant, and the closer the angle on the acute angle side to the long axis of the ellipse is, the longer it is, and the closer it is to 90 °, the shorter it is. Further, the outer edge member 44 forms the outer edge portion of the outer peripheral truss 40 and also forms the outer edge portion (peripheral portion) of the roof frame 20.

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

With the above configuration, the outer peripheral truss 40, which is a three-dimensional truss, is formed between the tension string truss 30 and the opening edge portion 10A of the lower structure 10.

<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 portion 10A of the lower structure 1-. At the center of the spherical roof frame (inside the outer peripheral truss 40), a plurality of ring-shaped string trusses 30 are arranged concentrically (string trusses 30A, 30B, 30C).

Therefore, as compared with the configuration in which one string truss is arranged over the spherical roof frame, the string truss is divided and the cause of the entire string truss can be lowered. As a result, it is easy to secure the effective height of the internal space (lower space) of the roof frame 20.

Further, as shown in FIGS. 2 and 3, on the outer peripheral portion (outside of the chord truss 30) of the roof frame 20, a diagonal member 46 is arranged in the plane of the arch member 22 which is a skeleton member, and the outer peripheral truss 40 is provided. It is formed. Therefore, it is possible to secure the rigidity to support the spherical roof frame 20 without arranging the string truss on the outer peripheral portion of the roof frame 20. As a result, it is easier to secure the effective height of the internal space.

Further, the opening edge portion 10A (see FIG. 1) of the lower structure 10 includes a major axis and a minor axis. Therefore, for example, the thrust force acting on the outer peripheral portion of the roof frame 20 spanning the opening edge portion 10A is larger than that in the case where the opening edge portion 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 higher than that in the 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 a 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 has an elliptical shape. As a result, as compared with the case where the outer edge member 44 has a rectangular shape or the like, 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, and the local concentrated stress Is unlikely to occur. Therefore, the structural stability is high. In addition, a roof structure with excellent design can be obtained.

Further, in the roof structure according to the embodiment of the present invention, the load acting on the arch member 22 radially laid by the weight of the roof frame 20 is applied by the chord member 38 via the bundle member 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-anchor type frame. As a result, a pillar-free space having 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 a shaped steel such as H-shaped steel or angle steel, or can be formed of a wire rod such as a steel wire or carbon fiber.

Further, in the roof structure according to the embodiment of the present invention, the chord members 38 are arranged so as to intersect each other in each string truss 30. Therefore, it is possible to prevent the roof frame 20 from being deformed by the horizontal force acting during an earthquake.

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

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

Further, in the present embodiment, the chord members 38 are arranged so as to intersect each other, but the embodiment of the present invention is not limited to this. That is, the chord members 38 can be arranged so as not to intersect each other. The string truss 30 can be a self-anchor type frame even if the string members 38 do not intersect with each other.

Further, in the present embodiment, the spherical surface Q along which the roof frame 20 is aligned is a true sphere, but the embodiment of the present invention is not limited to this. It can be any three-dimensional shape, for example, a shape obtained by rotating an arbitrary parabola around an axis. As described above, the present invention can be implemented in various aspects. In addition, each aspect can be used in combination as appropriate.

10 Substructure 10A Opening edge 22 Arch material (skeleton member)
20 Roof frame (spherical roof frame)
30 String truss 30A String truss 30B String truss 30C String truss 32 Upper ring material 32A Upper ring material 32B Upper ring material 32C Upper ring material 34 Lower ring material 34A Lower ring material 34B Lower ring material 34C Lower ring material 36 bundles Material 36A Bundle material 36B Bundle material 36C Bundle material 38 String material 38A String material 38B String material 38C String material 40 Outer circumference truss 46 Diagonal material

Claims (3)

A spherical roof frame formed by radially straddling a plurality of skeletal members on an opening edge having a long axis and a short axis formed at the upper end of the lower structure.
A ring-shaped chord truss that constitutes the central part of the spherical roof frame and is arranged concentrically.
An outer peripheral truss formed by arranging diagonal members in the plane of the skeleton member, which constitutes the outer peripheral portion of the spherical roof frame.
Roof structure with. The string truss
With the skeleton member
An upper ring material formed in a ring shape by connecting the skeleton members and
The lower ring material provided below the upper ring material and formed in a ring shape,
A bundle material that connects the upper ring material and the lower ring material,
Formed with the lower ring member and the chord member connecting the skeleton member.
The roof structure according to claim 1, wherein the chord members are arranged so as to intersect each other. The spherical roof frame has an elliptical shape in a plan view.
The roof structure according to claim 1 or 2.