JPH06108579A - On-off operated roof structure - Google Patents

Abstract

PURPOSE:To make an opening rate in an upper opening part increasable without enlarging a mobile roof by installing a fixed roof being free of horizontal movements and the mobile roof being shiftable and superposable with the fixed roof, respectively. CONSTITUTION:Each of fixed roofs 11, 11 is installed in both fixed structures 10 and 10 free of horizontal movements, and likewise a mobile roof 13 is installed as shiftably on the fixed structure 10 and superposably with the fixed roof 11. At the time of opening from the blocking state, the mobile roof 13 is shifted to a superposing position D and, after making it into a state of being superposed with the fixed roof 11, it is slid to the outside of the fixed structure 10. At the time of blocking from the opened state, the mobile roof 13 and the fixed roof 11 are slid inward the fixed structure 10 in a state of being superposed with each other, and then the mobile roof 13 is shifted in a direction where its superposed area with the fixed roof 11 is decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an openable and closable roof structure suitable for use in facilities such as baseball fields and sports stadiums.

[0002]

2. Description of the Related Art Conventionally, it has been common that large-scale competition facilities such as baseball fields and sports fields are not provided with roofs, but in recent years, facilities that can be used regardless of the weather have been desired. , Glass fiber fabric with tetrafluoroethylene resin
(A so-called Teflon resin) is used as a roofing material, which is a membrane material coated with a resin, and is inflated by air pressure. Various kinds of openable and closable roof structures have been proposed that can be opened and closed as needed.

By the way, in the above facilities,
Not only athletics, but also concerts and various events
Since a wide variety of events are held, it is desirable to be able to adjust the environmental conditions such as the brightness and acoustic characteristics in the facility to the optimum state according to the event to be held, but the roof with an air film structure is desired. Neither of the provided facilities or the facilities with openable roofs proposed so far can do such a thing.

For example, in a roof with an air film structure,
The membrane material used as a roofing material is thin enough and has translucency. Therefore, in a facility with a roof of this structure, it is possible to satisfactorily collect natural light in the facility. On the other hand, there is an advantage, but even if it is necessary to block the natural light, such a thing cannot be done, and it is impossible to darken the facility in the daytime. Therefore,
There is a problem in that it is impossible to hold an event that requires darkening in the facility, for example, an event in which the lighting effect of a concert or the like is important in the daytime.

Further, in the roof structure which can be opened and closed, which has been proposed so far, the situation is the same as that of the air film structure roof when the film material is used as the roof material. If you use a metal plate that you have, you can darken the facility by closing the roof even in the daytime, but for example, even if you close the roof like when playing baseball during the daytime when it rains, there is some natural light. However, there is a problem in that in such a case, it is necessary to rely entirely on artificial lighting even in the daytime.

Further, in any case, the acoustic characteristics in the facility such as reverberation time are almost determined by the roof material and the ceiling material. Therefore, the acoustic characteristics are optimized in accordance with the event to be held. It is impossible to adjust to. In this way, with the conventional air film structure and openable roof structure, it is not possible to freely and optimally adjust the environmental conditions in the facility according to the event to be held, and as a result, There was a drawback that the use of this facility was limited.

In view of the above problems, it has been proposed in recent years to construct an openable / closable roof structure 1 mainly composed of a frame formed by assembling steel frames, as shown in FIGS. 5 to 7. There is. As shown in FIG. 5 to FIG. 7, the roof structure 1 includes a fixed roof 2 constructed on an upper part of the facility having an annular shape in plan view and a first movable roof provided on the upper part of the facility.
It is composed of the second moving roofs 3 and 4. Fixed roof 2
Is a roughly crescent shape in which a ceiling 5 covering the center of the facility in a plan view is provided on the inner corner side of the curve, and covers approximately one third of the upper opening of the facility. The first and second movable roofs 3 and 4 are formed in the same shape as the fixed roof 2 in plan view, and the rotary shaft 6 is provided at the tip of each ceiling part 5 to the fixed roof 2.
It is provided in communication with the tip of the ceiling portion 5 and is rotatable in the horizontal direction about the rotation shaft 6. Figure 7
As shown in FIG. 1, the first movable roof 3 is a fixed roof 2 in cross section.
Is provided from above and is provided on the rotating shaft 6 so as to be horizontally rotatable at a position where the lower surface covers the upper surface of the fixed roof 2. The second movable roof 4 is in a form of covering the first movable roof 3 from above in a sectional view, and is horizontally rotated by the rotation shaft 6 at a position where the lower surface covers the upper surface of the first movable roof 3. It is possible.

The operation of the roof structure 1 will be described below. The first and second movable roofs 3 and 4 are configured to open and close the upper part of the facility by rotating around the rotating shaft 6. That is, as shown in FIG. 6, in order to open the upper opening, the first and second moving roofs 3 and 4 are fixed to the fixed roof 2.
Rotate to the upper part of the to establish a superposed state. The first movable roof 3 and the second movable roof 4 are gradually moved toward the fixed roof 2 in the circumferential directions opposite to each other along the peripheral edges of the facility, so that the entire roof is gradually fixed. The overlapping area with 2 is increased, and the roof structure 1 is gradually opened from a portion far from the fixed roof 2. As the polymerization proceeds,
When the second movable roofs 3 and 4 and the fixed roof 2 are in a state where they are completely coincident with each other in a plan view, the opening amount becomes maximum and the upper opening portion is completely opened.

On the contrary, as shown in FIG. 5, in order to close the upper opening, the first and second moving roofs 3 and 4 are moved in the opposite circumferential directions away from the fixed roof 2 at the upper part of the facility. By moving, the first and second moving roofs 3, 4
And the overlapping area of the fixed roof 2 with each other is reduced. First, second
When the end surfaces of the movable roofs 3 and 4 located on the respective moving direction sides substantially coincide with each other in plan view, the closing is completed. Since the first and second moving roofs 3 and 4 are provided with moving means such as wheels at the lower end portions of the first and second moving roofs 3 and 4, the upper end of the facility is arranged in the circumferential direction. It is possible to move smoothly.

[0010]

However, as shown in FIG. 5, in the roof structure 1, when the upper part of the facility is opened, the fixed roof 2 and the first and second moving roofs 3 and 4 are formed. Are stacked to form a three-layered laminated state, but it is necessary to form a roof that is located above in a size large enough to cover the roof located below from the outside during stacking. The roof becomes larger in size and causes a rise in the construction cost of the roof structure 1 and a reduction in construction efficiency.

If the roof structure 1 becomes large,
As the above problems become more prominent and the number of laminated layers at the time of polymerization increases, it is necessary to increase the size of the substructure of the facility that should support these roofs. There is also a problem that the volume of space becomes small and the area of the site where the facility should be constructed cannot be effectively used. Furthermore, the increase in size of the first and second movable roofs 3 and 4 takes time to move, and the weight to be supported increases, so it is necessary to increase the size of the moving mechanism.
The construction cost of the roof structure 1 will be further increased and the construction efficiency will be further reduced.

In view of the above problems, if the fixed roof 2 is enlarged to reduce the size of the first and second movable roofs 3 and 4, the maximum opening ratio of the roof structure 1 will be reduced. ,
It does not lead to a fundamental solution to the above problems.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a retractable roof structure capable of increasing the opening ratio of the upper opening of the facility without increasing the size of the moving roof. Has an aim.

[0014]

According to a first aspect of the present invention, there is provided a fixed structure for the large-scale facility and a roof body supported by the fixed structure, the roof body being the fixed structure. A fixed roof that is horizontally movable to the fixed roof, and a movable roof that is movable on the fixed structure and is configured to be superimposable with the fixed roof, and the movable roof is the fixed structure together with the fixed roof. Of the covering position that covers the upper opening of the and the overlapping position where the fixed roof is overlapped, and the storage position and the overlapping position that are provided on the fixed structure outside in plan view. An openable roof structure characterized by being configured to be movable between spaces.

According to a second aspect of the present invention, in the opening / closing roof structure according to the first aspect, in a plan view, the fixed structure is formed in an annular shape having a substantially circular outer peripheral portion, The fixed roof is formed in a substantially semi-circular shape that covers at least a central portion of the upper opening of the fixed structure, and the movable roof is fixed with the fixed roof located in the central portion of the upper opening as a rotation center. A retractable roof, which is rotatably provided in a circumferential direction of a structure, and a fixed roof and a movable roof are provided so as to be movable between a storage position and the overlapping position in a state of being overlapped with each other. Construction.

According to a third aspect of the present invention, in the openable roof structure according to the first aspect, the movable roof is composed of a plurality of divided roof bodies formed in a divided form. A retractable roof structure featuring.

According to a fourth aspect of the present invention, in the opening / closing roof structure according to the second aspect, the movable roof has a plurality of forms in which the movable roof is divided in a circumferential direction with a radius around the rotation center. A retractable roof structure characterized by being composed of a split roof body.

[0018]

According to the retractable roof structure of claim 1, the movable roof moves between the covering position and the overlapping position, and between the overlapping position and the retracted position to open and close the upper opening of the facility. To do. When opening from the closed state, the moving roof slides to the outside of the fixed structure after moving to the overlapping position and overlapping with the fixed roof. When closing from the open state, contrary to the time of opening, the movable roof slides inward of the fixed structure portion in a state of overlapping with the fixed roof,
Move in a direction that reduces the overlapping area with the fixed roof.

According to the retractable roof structure of claim 2,
Since the fixed structure is annular in plan view, the movable roof is rotated about the fixed roof located in the center of the fixed structure in plan view and the edge is rotated in the circumferential direction of the fixed structure. Move between the covering position and the overlapping position. In addition, the entire roof body in a state where the moving roof and the fixed roof are superposed,
Move between the stacking position and the storage position.

According to the retractable roof structure of claim 3,
The split roof body is located at the target position of the opening of the fixed structure, thereby covering the target area of the opening. By making the split roof body continuous in the plane direction at the opening of the fixed structure, and further continuing with the fixed roof in plan view,
The entire opening is closed. In addition, each split roof body is movable between the covering position and the overlapping position, and is movable between the overlapping position and the storage position together with the fixed roof in a state of overlapping with the fixed roof.

According to the retractable roof structure of claim 4,
The divided roof body moves in the circumferential direction of the fixed structure and is located at the target position of the opening, thereby covering the target area of the opening. By making the split roof body continuous in the plane direction at the opening of the fixed structure, and further making it continuous with the fixed roof in plan view, the entire opening is closed. In addition, each split roof body is movable along the circumferential direction of the fixed structure between the covering position and the overlapping position, and, in the state of overlapping with the fixed roof, the overlapping position and the storage position together with the fixed roof. You can move between them.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. In the figure, reference numeral 10 is a fixed structure provided with the retractable roof structure of this embodiment, 10a is an internal space, 10b is a slide groove, 11 is a fixed roof, and 12 is an opening formed in the upper part of the internal space 10a. , 13 is a moving roof that opens and closes the opening 12, 14 is a split roof body that constitutes the moving roof 13, A is a roof body, and B is a slide carriage.

As shown in FIGS. 1 and 2, the roof main body A to which the retractable roof structure of this embodiment is applied is fixed to the upper part of the fixed structure 10 having an annular shape in a plan view and fixed in a semicircular shape in a plan view. The roof 11 and the movable roof 13 that can cover the opening 12 of the fixed structure 10 that is not covered by the fixed roof 11 are configured. The moving roof 13 is composed of two divided roof bodies 14. The split roof body 14 has the opening 12 in plan view.
Is divided into two equal parts with a radius centered on the central portion of the fixed structure 10 and is rotatably provided in the circumferential direction of the fixed structure 10.

As shown in FIG. 2, the fixed structure 10 has a mortar-like shape and has an internal space 10a having a flat ground 15 formed therein. A stand 16 for accommodating a spectator of a sports competition held on a ground 15 formed in the central portion of the fixed structure 10 is provided on the slope inclined in the central portion inside the fixed structure 10. The uppermost outer edge of the fixed structure 10 is formed on a flat upper surface 17, and a moving guide 18 for moving the opening 12 is laid on the upper surface 17.

In the portion of the upper surface 17 where the fixed roof 11 is located, a plurality of slide grooves 10b for moving the roof main body A inward and outward in the plan view of the fixed structure 10 are formed. The slide groove 10b is a groove extending in a direction perpendicular to the chords of the fixed roof 11, and is provided internally with 32 that runs along the length of the slide groove 10b. Further, a roof main body support portion 10c for extending the slide groove 10b is provided on the outside of the fixed roof 11 in the lengthwise direction of the slide groove 10b. As shown in FIG. 1, the internal space 10 a has a substantially elliptical shape in plan view and is formed close to the opening 12 side of the fixed structure 10.

As shown in FIGS. 1 and 2, the stand 16
The construction area is small in the portion of the internal space 10a located in the uneven distribution direction with respect to the fixed structure 10, and conversely, the construction area is large in the portion located in the direction opposite to the uneven distribution direction of the internal space 10a. The stand 16 uses, for example, the ground 15 as a baseball field,
The portion located on the outfield side of the internal space 10a is fixed to the structure 1
The construction area on the side of the opening 12 is smaller than the construction area on the side of the open field, and the construction area on the home plate side is large. The movement guide 18 has an annular shape in a plan view and is laid evenly on the entire upper surface 17.

The fixed roof 11 is formed mainly of a space truss 19, and a dome body whose uppermost portion is located in the center of the ground 15 and whose outer edge in plan view coincides with the upper surface 17 is divided by a diameter in plan view. The fixed structure 10 is provided above the fixed structure 10. In addition, as shown in FIG.
Movement trajectories 20 for moving 4 are evenly arranged concentrically along the circumferential direction.

As shown in FIG. 2, the space truss 19 is formed.
Are formed by combining an upper chord member, a lower chord member and a lattice member each made of a steel pipe or the like, and are arranged radially around a portion located in the central portion of the ground 15 and at the center of the ground 15. It has an arcuate shape with the portion located at the top as the apex and convexly curved upward.

As shown in FIGS. 1 and 2, the split roof body 1
Reference numeral 4 denotes a fan shape in which the plan view opening 12 is cut into approximately a quarter, and like the fixed roof 11, is mainly composed of a space truss 19. Further, as shown in FIGS. 1 and 2, the split roof body 14 has a shape obtained by dividing a circle having a radius slightly smaller than that of the fixed roof 11, and when closed, the tip thereof coincides with the tip of the fixed roof 11. On the lower surface of the split roof body 14, traveling means (not shown) that is inserted into each of the moving tracks 20 and travels in each moving track 20 in the circumferential direction of the fixed structure 10 is provided.

As shown in FIGS. 1 and 3, the fixed structure 1
At the edge of the split roof body 14 located on the upper surface 17 of 0,
A moving carriage 25 for moving the split roof body 14 along the circumferential direction of the upper surface 17 by being inserted into a moving guide 18 provided on the upper surface 17 over the entire circumference is provided.

The moving guide 18 is a ring body which is a right-angled triangle in a schematic sectional view and is substantially equal to the upper surface 17 in a plan view.
The upper surface 1 with the hypotenuse facing the center of the fixed structure 10
It is installed on 7. Further, the moving guide 18 has a slide carriage B that is detachably attached to the moving guide 18 and is movable in the longitudinal direction of the slide groove 10b at a portion located in the slide groove 10b. As shown in FIG. 3, by fixing a pair of two flanges 27 having an L-shaped cross section in the central portion of the oblique side portion of the moving guide 18 so as to extend in the entire circumferential direction of the moving guide 18, A moving carriage insertion portion 26 into which the moving carriage 25 is inserted is formed. Each of the flanges 27 has a tip on one side which is a movement guide 1
8 is provided so as to extend vertically to the oblique side portion, and the other ends are fixed in parallel to each other with the opposite ends facing each other, and are arranged so as to surround the moving carriage insertion portion 26. Then, the movement guide 18 stably supports the load and the thrust force of the divided roof body 14 transmitted via the movement carriage 25 to the fixed structure 10.

As shown in FIG. 4, the slide cart B is provided.
Has a configuration similar to that of the moving guide 18 in cross-section, and when fitted into the moving guide 18, the moving guide 18 is continuous with the moving guide 18 to form a moving track of an annular moving carriage 25 which is continuous in a plan view. A plurality of slide wheels C for traveling in the slide groove 10b are attached to the lower portion of the slide carriage B. Further, since the slide carriage B is equipped with a drive device (not shown), the slide wheel C is rotated by the drive force of the drive device to slide the slide groove 10.
It is designed to run on b.

An appropriate number of moving carriages 25 are provided at the edge of the split roof body 14, and the moving carriage inserting portions 26 are inserted into the moving carriage inserting portions 26 so that the moving carriage inserting portions 26 can travel in the longitudinal direction thereof. There is. Each of the moving carriages 25 has a plurality of rotatable traveling wheels 29, which are arranged in contact with a rail 28 fixed to the slope of the moving guide 18 or the inner surface of the other side portion of the flange 27, in the upper and lower portions. Further, rotatable guide wheels 30 contacting the inner surface of the one side of the flange 27 are provided at both ends in the width direction. Then, the moving carriage 25 is stably installed in the moving carriage inserting portion 26 in the longitudinal direction in a state where the moving carriage 25 is installed at an appropriate position of the moving carriage inserting portion 26 through the traveling wheels 29 and the guide wheels 30. To run.

A drive source for moving the divided roof body 14 is mounted on a traveling means (not shown) or a moving carriage 25 which travels on the moving track 20. Further, the drive source may be provided separately from the traveling means and the moving carriage 25.

The operation and effect of this embodiment will be described below. The openable roof structure has two split roof bodies 14, 1
The openings 12 are opened when 4 is rotated toward the center of the fixed roof 11 in opposite directions. If the rotating split roof bodies 14 and 14 rotate until their end surfaces substantially contact each other at a radius position that bisects the fixed roof 11, the fixed roof 11 and the fixed roof 11 are completely overlapped with each other to rotate. The portion located at the rearmost portion is in a state of protruding from the fixed roof 11 toward the opening 12 (FIG. 5. In FIG. 5, the position where the movable roof 13 is completely overlapped with the fixed roof 11 is referred to as “overlap position D”. ). When the movable roofs 13 and 14 are located at the overlapping position D, the respective movable carriages 25 of the movable roof 13 are respectively located in the slide grooves 10b, so that the respective movable carriages B are detachable from the movable guide 18. Becomes

When the movement of the split roof bodies 14, 14 to the overlapping position D is completed, the slide carriage B is moved to the slide groove 1.
By moving along 0b, the roof main body A is slid outward in a plan view of the fixed structure 10 while the fixed roof 11 and the movable roof 13 are overlapped with each other (FIG. 6. In the figure, the roof main body). The outermost position of A with respect to the fixed structure 10 is referred to as "storage position E").

As shown in FIG. 5, when the split roof body 14 is located at the overlapping position D and the moving roof 13 is formed, the split roof body 14 is opened from the tip of the fixed roof 11 to the opening 1.
Since the movable roof 14 is projected in two directions, the movable roof 14 is slid from the overlapping position D to the retracted position E to eliminate the portion protruding to the opening 12 of the movable roof 14 and to adjust the opening amount of the opening 12. Increase.

When closing the opened opening 12, first, the roof body A is slid from the storage position E toward the central portion of the fixed structure 10 to be positioned at the overlapping position D. Then, the two split roof bodies 14, 14
Are rotated from the overlapping position D in directions opposite to each other, and the split roof body 1
The front end faces of the four and the four moving directions are brought into contact with each other (a continuous position where the end faces of the split roof bodies 14 and 14 are brought into contact with each other is referred to as a "covering position F"). The divided roof body 14,
When 14 reaches the covering position F, the movable roof 13 in plan view,
14 and the fixed roof 11 are continuously formed to complete the moving roof 13, and the opening 12 is completely closed.

Rotation of the divided roof body 14 in the circumferential direction of the fixed structure 10 is performed by all the traveling means and the moving carriages 25 (not shown) mounted on the same divided roof body 14.
Are driven by the driving force of the driving source to travel the moving track 20 or the moving guide 18 in the same direction and at a peripheral velocity having the same angular velocity with respect to the center of rotation.

Therefore, in the openable roof structure, the maximum number of roofs that can be stacked even when the split roof body 14 is moved is two, so that the maximum number of roofs is three or more. Thus, the split roof body 14 can be formed in a small size, the construction efficiency of the roof body A is improved, and the split roof body 1 is
It is possible to shorten the moving time of 4. Further, the step difference between the fixed roof 11 and the movable roof 13 when the opening 12 is closed becomes small, and a beautiful appearance can be formed.

On the other hand, the fixed roof 11 and the split roof body 14 are overlapped with each other, and the roof body A is fixed to the fixed roof 1
Since the sliding roof 1 and the moving roof 13 are slid to the outside of the fixed structure 10 even if the moving roof 13 is formed larger than the fixed roof 11, the moving roof 13 is fixed from the overlapping position D to the fixed structure. Since the opening 12 can be opened by moving to the outside of 10, the opening 12 can be formed large.

Further, since the movable roof 13 is composed of two divided roof bodies 14, each overlapping position D and covering position F are set.
In addition to being able to quickly move between and to improve the opening / closing speed, by moving the split roof body 14 to an appropriate position, it is possible to cover only a target area in the internal space 10a. Become.

[0043]

As described above, in the retractable roof structure of the present invention, the maximum number of stacks is 2, because the number of roofs that can be stacked even when the divided roof bodies are moved becomes a stacked state. In comparison with the case of 3 or more, the divided roof body can be formed in a smaller size, and it is possible to improve the construction efficiency of the roof body, reduce the construction cost, and shorten the moving time of the divided roof body. Further, as a result of the above, the step difference between the fixed roof and the moving roof when the opening is closed becomes small, and a beautiful appearance can be formed.

On the other hand, since the fixed roof and the split roof body are overlapped with each other, and the roof main body is slid outside the fixed structure while the fixed roof and the moving roof are in the overlapped state, it is possible to compare with the fixed roof. Even if the moving roof is formed large, the opening can be formed by moving the moving roof from the overlapping position to the outside of the fixed structure, so that the opening can be formed large.

Further, since the movable roof is composed of a plurality of divided roof bodies, the moving distance between the storage position and the covering position can be shortened, and the moving speed can be increased. Besides, it is possible to cover only a target area in the internal space by moving the split roof body to an appropriate position.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a retractable roof structure of the present invention.

FIG. 2 is a side sectional view of the above.

FIG. 3 is an enlarged view showing a moving carriage for a moving roof.

FIG. 4 is an enlarged view showing a carriage for sliding a roof body.

FIG. 5 is a plan view showing a moving roof located in a stacking position.

FIG. 6 is a plan view showing the roof body located at the storage position.

FIG. 7 is a plan view showing a closed state of a conventional roof structure.

8 is a plan view showing the opened state of FIG. 7. FIG.

9 is a side sectional view of FIG.

[Explanation of symbols]

 10 Fixed Structure 10a Internal Space 10b Slide Groove 10c Roof Main Body Support 11 Fixed Roof 12 Opening 13 Moving Roof 14 Divided Roof A A Roof Main D Overlapping Position E Storing Position F Covering Position

Claims (4)

[Claims] 1. A roof structure, which can be opened and closed and is applied to a large-scale facility such as an athletic stadium, comprising a fixed structure of the large-scale facility and a roof main body supported by the fixed structure. The main body is composed of a fixed roof that is horizontally movable on the fixed structure, and a movable roof that is movable on the fixed structure and that can be overlapped with the fixed roof. A storage that is configured to be movable between a covering position that covers the upper opening of the fixed structure together with the fixed roof and a stacking position where the fixed roof overlaps, and is provided outside the plan view on the fixed structure. A retractable roof structure characterized by being configured to be movable between a position and the overlapping position. 2. The retractable roof structure according to claim 1, wherein the fixed structure is formed in an annular shape having a substantially circular outer peripheral portion in plan view, and the fixed roof is the fixed structure. The movable roof is formed in a substantially semi-circular shape covering at least a central portion of the upper opening of the object, and the movable roof is arranged in the circumferential direction of the fixed structure with the fixed roof located in the central portion of the upper opening as a rotation center. An openable roof structure in which the fixed roof and the movable roof are rotatably provided so as to be movable between a storage position and the overlapping position in a state of being overlapped with each other. 3. The retractable roof structure according to claim 1, wherein the movable roof is composed of a plurality of divided roof bodies formed in a divided form. Roof structure. 4. The retractable roof structure according to claim 2, wherein the movable roof is composed of a plurality of divided roof bodies which are divided in a circumferential direction at a radius having the rotation center as a center. A retractable roof structure characterized by being used.