Roof structure

Abstract

To efficiently reduce the vibration of a roof in an earthquake.SOLUTION: A roof structure is formed in an arch shape straddling a field 22, and provided with an upper roof frame 32 and a lower roof frame 34 arranged so as to overlap each other in plan view, and a vibration control device 50 which is disposed between the upper roof frame 32 and the lower roof frame 34 and connects the upper roof frame 32 and the lower roof frame 34, and is connected to an intermediate part 32M, 34M in the longitudinal direction of at least one of the upper roof frame 32 and the lower roof frame 34.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a roof structure. [Background technology]

[0002] A roof structure is known that includes a fixed roof having an opening, a movable roof that opens and closes the opening, and a displacement absorbing member that is provided at the connection between the fixed roof and the movable roof and connects the fixed roof and the movable roof so that the fixed roof and the movable roof can be displaced relative to each other (see, for example, Patent Document 1).

[0003] In addition, a method of seismic reinforcement of an existing building is known in which a beam structure supported on the outside of the existing building and a frame that is integral with the existing building and can be displaced vertically on the outside of the existing building in response to lateral swaying of the building, deforms the beam structure due to vertical displacement of the frame caused by lateral swaying, and absorbs earthquake energy through deformation of the beam structure (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-020169 A [Patent Document 2] JP 2009-174282 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, it is conceivable to install a vibration control device such as an oil damper on the roof covering the field of a sports stadium for baseball, soccer, or the like, to reduce vibration of the roof during an earthquake.

[0006] However, the structural components that make up the roof of a stadium generally only have a small deformation angle during an earthquake, making it difficult to effectively reduce vibrations even if vibration control devices such as oil dampers are installed.

[0007] In consideration of the above, an object of the present invention is to efficiently reduce roof vibration during an earthquake. [Means for solving the problem]

[0008] The roof structure described in claim 1 comprises a first roof structure formed in an arch shape spanning a field, a second roof structure formed in an arch shape spanning the field, arranged above or below the first roof structure and having a longitudinal middle portion overlapping with the first roof structure in a plan view, and a vibration control device arranged between the first roof structure and the middle portion of the second roof structure and connecting the first roof structure and the middle portion of the second roof structure.

[0009] According to the roof structure of claim 1, the first roof structure and the second roof structure are formed in an arch shape spanning the field. The second roof structure is disposed above or below the first roof structure. The longitudinal middle portion of the second roof structure overlaps with the first roof structure in a plan view. A vibration damping device is disposed between the first roof structure and the longitudinal middle portion of the second roof structure. The vibration damping device connects the first roof structure and the longitudinal middle portion of the second roof structure.

[0010] Here, during an earthquake, the longitudinal middle part of the arch-shaped second roof structure is more likely to be displaced up and down than other parts. Therefore, by connecting the longitudinal middle parts of the first roof structure and the second roof structure with a vibration control device, the vibration control device can be efficiently operated (deformed) by the vertical displacement of the middle part. Therefore, the vibration of the roof during an earthquake can be efficiently reduced.

[0011] The roof structure described in claim 2 is the roof structure described in claim 1, in which the vibration control device is arranged between the longitudinal middle portion of the first roof structure and the middle portion of the second roof structure, connecting the middle portions of the first roof structure and the second roof structure.

[0012] According to the roof structure of claim 2, the vibration damping device is disposed between the longitudinal middle portion of the first roof structure and the longitudinal middle portion of the second roof structure, and connects these middle portions together.

[0013] Here, during an earthquake, the longitudinal middle parts of the first and second roof frames, which are formed in an arch shape, are likely to be displaced more vertically than other parts. Therefore, by connecting the longitudinal middle parts of the first and second roof frames with a vibration control device, the vibration control device can be operated (deformed) more efficiently by the vertical displacement of the middle parts. Therefore, the vibration of the roof during an earthquake can be reduced more efficiently.

[0014] The roof structure described in claim 3 is the roof structure described in claim 1, wherein the first roof structure and the second roof structure intersect in a plan view.

[0015] According to the roof structure of claim 3, the first roof structure and the second roof structure intersect in a plan view, which makes it easy to overlap the first roof structure and the middle part of the second roof structure in the longitudinal direction in a plan view.

[0016] The roof structure described in claim 4 is the roof structure described in claim 1, in which the first roof structure and the second roof structure are arranged side by side so that their sides overlap each other in a plan view.

[0017] According to the roof structure of claim 4, the first roof structure and the second roof structure are arranged side by side so that their respective sides overlap each other in a plan view. This makes it easy to overlap the first roof structure and the middle part of the second roof structure in the longitudinal direction in a plan view.

[0018] A roof structure according to a fifth aspect of the present invention is the roof structure according to any one of the first to fourth aspects, wherein the vibration damping device is of a velocity-dependent type.

[0019] According to the roof structure of claim 5, the vibration control device is of a velocity-dependent type. Here, for example, if the vibration control device is of a hysteretic type, residual deformation occurs in the vibration control device, and therefore, after an earthquake, work may be required to return the first roof frame and the second roof frame to their initial positions.

[0020] In contrast, in the present invention, the vibration control device is a velocity-dependent type such as an oil damper, so no residual deformation occurs. Therefore, there is no need to return the first roof frame and the second roof frame to their initial positions after an earthquake. This improves the maintainability of the first roof frame and the second roof frame. Effect of the Invention

[0021] As described above, according to the present invention, vibration of a roof during an earthquake can be efficiently reduced. [Brief description of the drawings]

[0022] [Figure 1] 1 is a perspective view showing a roof of a structure to which a roof structure according to a first embodiment is applied. FIG. [Diagram 2] 2 is a cross-sectional view taken along line 2-2 of FIG. 1. [Diagram 3] 3 is a cross-sectional view taken along line 3-3 in FIG. 1. [Figure 4] FIG. 1A is a schematic diagram showing the deformation state of an arch-shaped roof structure during a vertical earthquake, and FIG. 1B is a schematic diagram showing the deformation state of an arch-shaped roof structure during a horizontal earthquake. [Diagram 5] 1 is a perspective view showing a roof of a structure to which a modified example of the roof structure relating to the first embodiment is applied. FIG. [Figure 6] 6 is a cross-sectional view taken along line 6-6 in FIG. 5. [Figure 7] An oblique view showing the roof of a structure to which a roof structure relating to a second embodiment is applied. [Figure 8] 8 is a cross-sectional view taken along line 8-8 in FIG. 7. [Figure 9] 13 is a perspective view showing a roof of a structure to which a modified example of the roof structure relating to the second embodiment is applied. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] First embodiment First, the first embodiment will be described.

[0024] (structure) Fig. 1 shows a roof 30 of a structure 10 to which the roof structure according to this embodiment is applied. As shown in Fig. 2 and Fig. 3, the structure 10 has a large space 12 (see Fig. 2) inside, and is, for example, a sports or event facility such as a stadium for baseball, soccer, or track and field, or a concert hall. The structure 10 comprises a structure body 20, a roof 30, and a plurality of vibration control devices 50.

[0025] (Structure body) The structure body 20 has a foundation portion 20A and a stand portion 20B. The foundation portion 20A is, for example, a foundation slab (foundation bottom plate) made of reinforced concrete. The upper surface of the foundation portion 20A is a flat surface. The upper surface of the foundation portion 20A is a field 22 such as a baseball field.

[0026] On the field 22, for example, natural grass or artificial grass, a stage, etc. (not shown) are provided. A stand section 20B surrounding the field 22 is provided on the outer periphery of this base section 20A.

[0027] The field 22 is not limited to being formed on the foundation portion 20A (foundation slab), and may be formed directly on the ground, for example, by omitting the foundation portion 20A (foundation slab), or may be formed on an earthen floor slab.

[0028] The stand section 20B is made of, for example, reinforced concrete and rises from the outer periphery of the foundation section 20A. The height of the stand section 20B increases from the field 22 toward the outer periphery of the foundation section 20A. A plurality of spectator seats (not shown) are provided in a stepped manner on the inclined portion of the stand section 20B on the field 22 side.

[0029] The shape and arrangement of the stand 20B can be changed as appropriate. The stand 20B is not limited to being made of reinforced concrete, and may be made of steel, for example. The shape and structure of the structure body 20 can also be changed as appropriate.

[0030] (roof) The roof 30 is formed in a dome shape and covers the field 22 and the stand section 20B from above. In addition, the roof 30 has a seismic isolation structure (seismic isolation roof), for example. A large space 12 is formed below the roof 30.

[0031] The roof 30 has an upper roof structure 32, a lower roof structure 34, and a roof material 36 (see FIG. 1) supported by the upper roof structure 32 and the lower roof structure 34. In FIG. 1, the outline of the roof material 36 is shown by a two-dot chain line. Also, either the upper roof structure 32 or the lower roof structure 34 is an example of a first roof structure, and the other of the upper roof structure 32 and the lower roof structure 34 is an example of a second roof structure.

[0032] 2 and 3, the upper roof structure 32 and the lower roof structure 34 are formed in an arch shape spanning the field 22. As an example, the upper roof structure 32 and the lower roof structure 34 are a three-dimensional truss structure combining multiple truss beams (roof beams) forming an arch shape.

[0033] The structure of the upper roof frame 32 and the lower roof frame 34 is not limited to a space truss structure, and may be another structure.

[0034] 1, the upper roof structure 32 and the lower roof structure 34 are formed in a rectangular shape in a plan view. Moreover, the upper roof structure 32 and the lower roof structure 34 are disposed so as to intersect with each other in a plan view.

[0035] As shown in Fig. 2, both longitudinal ends of the upper roof frame 32 are supported by the stand portion 20B of the structure main body 20 via seismic isolation devices 40. As an example, the seismic isolation devices 40 are laminated rubber bearings. The upper roof frame 32 is seismically isolated (seismically supported) by these seismic isolation devices 40. Note that the seismic isolation devices 40 are not limited to laminated rubber bearings, and may be sliding bearings, rolling bearings, etc.

[0036] As shown in Fig. 3, the lower roof structure 34 serving as the second roof structure is disposed below the upper roof structure 32 serving as the first roof structure. In other words, the upper roof structure 32 serving as the second roof structure is disposed above the lower roof structure 34 serving as the first roof structure. Furthermore, the lower roof structure 34 and the upper roof structure 32 are structurally separated from each other, and are capable of relative movement in the horizontal and vertical directions.

[0037] Both longitudinal ends of the lower roof frame 34 are supported by the stand portion 20B of the structure main body 20 via seismic isolation devices 42. As an example, the seismic isolation devices 42 are laminated rubber bearings. These seismic isolation devices 42 provide seismic isolation (seismic support) for the lower roof frame 34.

[0038] The seismic isolation device 42 is not limited to a laminated rubber bearing, and may be a sliding bearing, a rolling bearing, etc. Also, the lower roof frame 34 may be of earthquake-resistant construction, and only the upper roof frame 32 may be of earthquake-isolation construction.

[0039] 1, the roof material 36 is formed of, for example, a steel plate, a folded plate, a membrane material, etc., and is supported by the upper roof structure 32 and the lower roof structure 34. As described above, the upper roof structure 32 and the lower roof structure 34 are relatively movable in the horizontal direction and the vertical direction. Therefore, the roof material 36 supported by the upper roof structure 32 and the roof material 36 supported by the lower roof structure 34 are structurally separated.

[0040] (Vibration control device) 1, the upper roof structure 32 and the lower roof structure 34 intersect with each other so that their longitudinal middle portions 32M, 34M overlap each other in a plan view. A plurality of vibration control devices 50 are provided between the middle portions 32M, 34M of the upper roof structure 32 and the lower roof structure 34.

[0041] In this embodiment, for example, in the longitudinal direction of the upper roof frame 32, when the upper roof frame 32 is divided into thirds, the central portion is defined as the middle portion 32M, and the portions on both sides of the middle portion 32M are defined as the end portions 32E. Similarly, in the longitudinal direction of the lower roof frame 34, when the lower roof frame 34 is divided into thirds, the central portion is defined as the middle portion 34M, and the portions on both sides of the middle portion 34M are defined as the end portions 34E.

[0042] The vibration damping device (energy absorbing device) 50 is, for example, a velocity-dependent oil damper. The vibration damping device 50 is disposed with its extension direction being the vertical direction, and connects the middle parts 32M, 34M of the upper roof frame 32 and the lower roof frame 34 to each other.

[0043] Specifically, the multiple vibration damping devices 50 are disposed at intervals in the longitudinal direction of the upper roof frame 32. The upper end side of each vibration damping device 50 is connected to a middle portion 32M of a side portion 32S of the upper roof frame 32, and the lower end side of each vibration damping device 50 is connected to a middle portion 34M of the lower roof frame 34 that faces the side portion 32S of the upper roof frame 32 in the up-down direction.

[0044] (action) Next, the operation of the first embodiment will be described.

[0045] Generally, dome-shaped roofs (steel-framed roofs) are designed so that the structural members that make up the roof do not become plastic, even during a major earthquake. Therefore, it is difficult to expect hysteretic damping during a major earthquake with a dome-shaped roof. Also, with a dome-shaped roof, the deformation angle of the structural members during an earthquake is small, so it is difficult to reduce vibrations even if vibration control devices such as oil dampers are installed.

[0046] Here, in Fig. 4(A), as an example, the deformation state of the roof frame 100 during a vertical earthquake is shown by a two-dot chain line, and in Fig. 4(B), the deformation state of the arch-shaped roof frame 100 during a horizontal earthquake is shown by a two-dot chain line.

[0047] As shown in Figures 4(A) and 4(B), in an arch-shaped roof structure 100, during a horizontal and vertical earthquake, the longitudinal middle part 100M of the roof structure 100 experiences greater vertical displacement than the ends 100E on either side of it.

[0048] 1, in this embodiment, the upper roof structure 32 and the lower roof structure 34 formed in an arch shape spanning the field 22 are crossed so that their respective middle portions 32M, 34M in the longitudinal direction overlap each other in a plan view. A vibration control device 50 is disposed between the middle portions 32M, 34M of the upper roof structure 32 and the lower roof structure 34, and the middle portions 32M, 34M are connected by the vibration control device 50.

[0049] As a result, in the event of an earthquake in either the vertical or horizontal direction, the relative vertical displacement between the middle parts 32M, 34M of the upper roof frame 32 and the lower roof frame 34 increases. As a result, the vibration control device 50 can be efficiently operated (deformed, expanded and contracted).

[0050] Therefore, vibration of the roof 30 during an earthquake can be efficiently reduced. Furthermore, vibration of lighting, signs, concert equipment, etc. hung from the upper roof structure 32 and the lower roof structure 34 is also reduced. Therefore, the sense of anxiety felt by spectators during an earthquake can be reduced.

[0051] In this embodiment, the upper roof structure 32 and the lower roof structure 34 are crossed in a plan view. This makes it possible to easily overlap the middle portions 32M, 34M of the upper roof structure 32 and the lower roof structure 34 in a plan view.

[0052] Furthermore, in this embodiment, the vibration damping device 50 is a velocity-dependent oil damper. Here, for example, if the vibration damping device 50 is a hysteretic type such as a steel damper, residual deformation occurs in the vibration damping device 50, and therefore, after an earthquake, work may be required to return the upper roof frame 32 and the lower roof frame 34 to their initial positions.

[0053] In contrast, in this embodiment, since the vibration control device 50 is velocity-dependent, no residual deformation occurs after an earthquake. Therefore, since there is no need to return the upper roof frame 32 and the lower roof frame 34 to their initial positions after an earthquake, the maintainability of the roof 30 is improved.

[0054] (Modification of the first embodiment) Next, a modification of the first embodiment will be described.

[0055] In the first embodiment, the upper roof structure 32 and the lower roof structure 34 intersect in a plan view. However, for example, at least one upper roof structure and at least one lower roof structure may intersect in a plan view.

[0056] In the first embodiment, the vibration control device 50 is connected to the intermediate portions 32M, 34M in the longitudinal direction of the upper roof structure 32 and the lower roof structure 34. However, it is sufficient that the vibration control device 50 is connected to the intermediate portions 32M, 34M of either the upper roof structure 32 or the lower roof structure 34, and is also connected to the other of the upper roof structure 32 and the lower roof structure 34, and the arrangement and number of the vibration control device 50 can be changed as appropriate.

[0057] For example, the roof 60 of the structure 10 shown in Figures 5 and 6 has an upper roof structure 32, two lower roof structures 64, and roof materials (not shown) supported by the upper roof structure 32 and the two lower roof structures 64, respectively.

[0058] The two lower roof frames 64 are formed in a substantially semicircular shape in a plan view, and are formed in an arch shape spanning the field 22. Each lower roof frame 64 is disposed below the upper roof frame 32, and disposed on both longitudinal sides of the upper roof frame 32. Both longitudinal ends of the upper roof frame 32 are supported by the seismic isolation device 40 via the lower roof frames 64.

[0059] The upper roof structure 32 and the lower roof structure 64 are arranged such that the longitudinal end 32E of the upper roof structure 32 overlaps with the longitudinal middle portion 64M of the side portion 64S of the lower roof structure 64 in a plan view. A vibration damping device 50 is arranged between the end 32E of the upper roof structure 32 and the middle portion 64M of the side portion 64S of the lower roof structure 64. The vibration damping device 50 connects the end 32E of the upper roof structure 32 to the middle portion 64M of the side portion 64S of the lower roof structure 64.

[0060] Here, during an earthquake, the middle portion 64M of the side portion 64S of the lower roof frame 64 formed in an arch shape is likely to be displaced more in the vertical direction than the end portion 64E of the side portion 64S. Therefore, by connecting the vibration control device 50 to the middle portion 64M of the side portion 64S of the lower roof frame 64, the vibration control device can be efficiently operated (deformed) by the vertical displacement of the middle portion 64M. Therefore, the vibration of the roof 60 during an earthquake can be efficiently reduced.

[0061] In this modified example, the lower roof structure 64 is disposed below the upper roof structure 32. However, the upper roof structure 32 and the lower roof structure 64 may be reversed in position.

[0062] In addition, although not shown in the drawings, for example, it is also possible to arrange multiple upper roof structures and multiple lower roof structures so that they intersect in a lattice pattern in a plan view. Also, the lower roof structure may be of earthquake-resistant construction, and only the upper roof structure may be of earthquake-isolation construction.

[0063] Second Embodiment Next, a second embodiment will be described. In the second embodiment, the same reference numerals will be used to designate the same members as in the first embodiment, and the description thereof will be omitted as appropriate.

[0064] (roof) Fig. 7 shows a roof 70 to which the roof structure according to the second embodiment is applied. The roof 70 is formed in a dome shape, and covers the field 22 and the stand section 20B (see Fig. 8) from above. The roof 70 has an upper roof structure 72 and a lower roof structure 74, and roof materials (not shown) supported by the upper roof structure 72 and the lower roof structure 74, respectively.

[0065] 8, the upper roof structure 72 and the lower roof structure 74 are formed in an arch shape spanning the field 22. As an example, the upper roof structure 72 and the lower roof structure 74 are a three-dimensional truss structure made up of a combination of multiple truss beams forming an arch shape.

[0066] Both longitudinal ends of the upper roof frame 72 are supported by the stand portion 20B of the structure main body 20 via seismic isolation devices 40. Similarly, both longitudinal ends of the lower roof frame 74 are supported by the stand portion 20B of the structure main body 20 via seismic isolation devices 42.

[0067] The lower roof structure 74 as the second roof structure is disposed below the upper roof structure 72 as the first roof structure. In other words, the upper roof structure 72 as the second roof structure is disposed above the lower roof structure 74 as the first roof structure. In addition, the lower roof structure 74 and the upper roof structure 72 are structurally separated from each other, and are capable of relative movement in the horizontal and vertical directions.

[0068] (Vibration control device) As shown in Fig. 7, the upper roof structure 72 and the lower roof structure 74 are formed in a substantially semicircular shape in a plan view. The upper roof structure 72 and the lower roof structure 74 are arranged side by side so that their respective side portions 72S, 74S overlap each other in a plan view. A plurality of vibration control devices 50 are provided between the longitudinal middle portions 72M, 74M of the side portions 72S, 74S of the upper roof structure 72 and the lower roof structure 74.

[0069] The vibration control device 50 is disposed with its extension and contraction direction being the up-down direction, and connects the middle portions 72M, 74M of the side portions 72S, 74S of the upper roof structure 72 and the lower roof structure 74 to each other.

[0070] Specifically, the multiple vibration damping devices 50 are arranged at intervals in the longitudinal direction of the side portion 32S of the upper roof frame 72. The upper end side of each vibration damping device 50 is connected to a middle portion 72M of the side portion 32S of the upper roof frame 72, and the lower end side of each vibration damping device 50 is connected to a middle portion 74M of the side portion 74S of the lower roof frame 74.

[0071] (action) Next, the operation of the second embodiment will be described.

[0072] As shown in Figures 7 and 8, according to this embodiment, the upper roof structure 72 and the lower roof structure 74 are formed in an arch shape that spans the field, and are arranged side by side so that their side portions 72S, 74S overlap each other in a plan view. A vibration control device 50 is arranged between the middle portions 72M, 74M of the side portions 72S, 74S of the upper roof structure 72 and the lower roof structure 74. The vibration control device 50 connects the middle portions 72M, 74M of the side portions 72S, 74S of the upper roof structure 72 and the lower roof structure 74.

[0073] Here, during an earthquake, the middle portions 72M, 74M of the sides 72S, 74S of the upper roof structure 72 and the lower roof structure 74, which are formed in an arch shape, are prone to greater vertical displacement than the end portions 72E, 74E of the side portions 72S, 74S.

[0074] Therefore, by connecting the middle sections 72M, 74M of the side sections 72S, 74S of the upper roof frame 72 and the lower roof frame 74 with the vibration control device 50, the vibration control device 50 can be efficiently operated (deformed, expanded and contracted) by the relative vertical displacement of the middle sections 72M, 74M. Therefore, in this embodiment, similar to the first embodiment, vibration of the roof 70 during an earthquake can be efficiently reduced.

[0075] Moreover, the upper roof structure 72 and the lower roof structure 74 are arranged side by side so that their respective side portions 72S, 74S overlap each other in a plan view. This allows the middle portions 72M, 74M of the upper roof structure 72 and the lower roof structure 74 to easily overlap each other in a plan view.

[0076] (Modification of the second embodiment) Next, a modification of the second embodiment will be described.

[0077] In the second embodiment, the upper roof structure 72 and the lower roof structure 74 are formed in a substantially semicircular shape in a plan view. However, the planar shapes of the upper roof structure 72 and the lower roof structure 74 can be changed as appropriate. For example, in the modified example shown in Fig. 9, the upper roof structure 72 and the lower roof structure 74 are formed in a rectangular shape in a plan view.

[0078] Also, in the second embodiment, the middle portions 72M, 74M of the side portions 72S, 74S of the upper roof structure 72 and the lower roof structure 74 are connected to each other by the vibration control device 50. However, it is sufficient that the vibration control device 50 is connected to the middle portions 72M, 74M of either the upper roof structure 72 or the lower roof structure 74, and is also connected to the other of the upper roof structure 72 and the lower roof structure 74, and the arrangement and number thereof can be changed as appropriate.

[0079] (Other variations) Next, modified examples of the first and second embodiments will be described. Note that, although various modified examples will be described below using the first embodiment as an example, these modified examples can also be appropriately applied to the second embodiment.

[0080] In the first embodiment, the vibration damping device 50 is a velocity-dependent type such as an oil damper. However, the vibration damping device 50 is not limited to an oil damper, and may be, for example, a velocity-dependent vibration damping device such as a viscous damper or a viscoelastic damper. Furthermore, the vibration damping device 50 is not limited to a velocity-dependent type, and may be, for example, a hysteretic type (hysteretic damping type) vibration damping device such as a steel damper.

[0081] In the first embodiment, the upper roof structure 32 and the lower roof structure 34 are formed in a substantially rectangular shape in a plan view. However, the planar shapes of the upper roof structure 32 and the lower roof structure 34 can be changed as appropriate.

[0082] In the above embodiment, the roof 30 is formed in a dome shape. However, the shape of the roof 30 is not limited to a dome shape, and may be, for example, an arch shape.

[0083] In the first embodiment, both the upper roof frame 32 and the lower roof frame 34 are of a seismic isolation structure. However, for example, the upper roof frame 32 may be of a seismic isolation structure and the lower roof frame 34 may be of a seismic resistant structure, or both the upper roof frame 32 and the lower roof frame 34 may be of a seismic resistant structure.

[0084] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it is of course possible to implement the present invention in various forms without departing from the gist of the present invention. [Explanation of symbols]

[0085] 22 Field 32 Upper roof frame (first roof frame, second roof frame) 32M: Middle part of upper roof structure in the longitudinal direction 32S Upper roof structure side 34 Lower roof frame (first roof frame, second roof frame) 34M The middle part of the lower roof structure in the longitudinal direction 50 Vibration control device 64 Lower roof frame (first roof frame, second roof frame) 64M The middle part of the lower roof structure in the longitudinal direction 64S Side of lower roof structure 72 Upper roof frame (first roof frame, second roof frame) 72M: Middle part of upper roof structure in the longitudinal direction 72S Side of upper roof structure 74 Lower roof frame (first roof frame, second roof frame) 74M The middle part of the lower roof structure in the longitudinal direction 74S Lower roof structure side

Claims

1. The first roof structure is formed in an arch shape spanning the field, A second roof structure formed in an arch shape spanning the field, disposed above or below the first roof structure, and having a longitudinal middle portion overlapping with the first roof structure in a plan view; A vibration control device is disposed between the first roof structure and the middle portion of the second roof structure and connects the first roof structure and the middle portion of the second roof structure; A roof structure comprising:

2. The vibration control device is disposed between a longitudinal middle portion of the first roof structure and a longitudinal middle portion of the second roof structure, and connects the middle portions of the first roof structure and the second roof structure to each other. The roof structure of claim 1.

3. The first roof structure and the second roof structure intersect in a plan view. The roof structure of claim 1.

4. The first roof structure and the second roof structure are arranged side by side so that their respective sides overlap each other in a plan view. The roof structure of claim 1.

5. The vibration damping device is velocity dependent. A roof structure according to any one of claims 1 to 4.

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