JP3810634B2 - Dome roof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dome roof that covers a columnar type above a facility having a large area such as a baseball field or a soccer field.
[0002]
[Prior art]
Currently, a dome roof covering the top of a baseball stadium and other facilities has been developed so that baseball, soccer, and other events can be held in spite of rain. . In many conventional dome roofs, the entire roof is formed by stretching a planar roof member on a roof frame formed by combining aggregates. However, since the overall outside diameter including the spectator seats reaches 200 m in the above facilities, the weight of the roof becomes very large, and the lower structure supporting this roof also needs to have a corresponding strength. It becomes big and construction cost becomes high.
[0003]
Therefore, it is considered that the roof frame is not formed of a frame but formed of a cable stretched between columns. With such a structure, the roof can be lightened. However, in this case, the support column needs to have a height larger than the maximum height of the roof. For example, in the case of a baseball stadium, a height of 60 m is required at the center portion so that the hit ball of a strong hitter does not hit, so that the strut needs a height of 60 m or more. This height is comparable to the height of an approximately 20-story building, and the construction of a large number of such columns with a large height causes an increase in cost.
In either case, the roof height of the spectator seat is unnecessarily high as a result of being dragged to the required height of the roof of the central portion, resulting in a waste of air conditioning energy.
[0004]
[Problems to be solved by the invention]
In view of the above problems, an object of the present invention is to provide a dome roof structure that is easy to construct and has no waste while ensuring the height of the central portion.
[0005]
[Means for Solving the Problems]
According to invention of Claim 1, it is a dome roof which covers a lower area facility of a large area in a pillar-free manner,
The central roof formed with a high inside is supported by a suspension cable extending inward from the outer peripheral support formed on the outer periphery of the lower facility, and the central roof is moved upward by a restraining cable extending inward and upward from the outer peripheral support. A dome roof is provided, in which an outer roof is formed by stretching a planar roof member on a restraining cable.
The dome roof constructed in this way is secured at the height of the roof of the central portion, but the roof of the outer portion is low, so there is no waste, and it is lightweight because it is formed by stretching the roof member on the cable. Therefore, it is not necessary to enlarge the outer peripheral support, and the construction cost is reduced.
[0006]
According to the invention of claim 2, in the invention of claim 1, the outer peripheral support is a box-shaped outer peripheral ring attached to the outer top of the lower structure forming the stand, and the central roof is attached to the inner peripheral ring The suspension cable is provided with a dome roof supporting the inner ring.
According to the invention of claim 3, in the invention of claim 2, a dome roof in which the inner peripheral ring has a box-shaped cross section is provided.
According to the invention of claim 4, in the invention of claim 2, the inner ring is composed of a ring cable and a joining member attached to the ring cable, and the joining member has a suspension cable, a restraining cable, and / or a central roof. A dome roof to which is attached is provided.
According to the invention of claim 5, in the invention of claim 2, the outer roof is provided with a dome roof covering the upper side of the stand.
[0007]
According to the invention of claim 6, in the invention of claim 2, the holding cable is provided with a dome roof disposed below the suspension cable.
According to the invention of claim 7, in the invention of claim 2, the holding cable is provided with a dome roof disposed above the suspension cable.
According to the invention of claim 8, in the invention of claim 7, there is provided a dome roof in which a restraining cable connects the center of the central roof and the outer peripheral support.
According to the invention of claim 9, in the invention of claim 7, there is provided a dome roof in which a sealed gas layer is provided between the holding cable and the suspension cable.
[0008]
According to the invention of claim 10, in the invention of claim 2, the suspension cable extending from a plurality of outer mounting positions of the outer ring and / or the dome in which the holding cable reaches one inner mounting position of the inner ring. A roof is provided.
According to the invention of claim 11, in the invention of claim 2, the suspension cable and / or the holding cable that goes inward from the outer peripheral ring crosses the inner peripheral ring and then differs from the crossing position in the circumferential direction. A dome roof is provided that is attached in position to the inside of the inner ring.
According to the invention of claim 12, in the invention of claim 11, the suspension cable and / or the holding cable pass through a pulley attached to the inner ring when crossing the inner ring. A dome roof is provided.
[0009]
According to the invention of claim 13, in the invention of claim 2, there is provided a dome roof in which the central roof is an arched roof formed by stretching a film-like roof member on a roof frame joined with aggregate.
According to the invention of claim 14, in the invention of claim 2, a dome roof is provided in which the central roof is composed of an annular outer central roof and an inner central roof.
[0010]
According to the invention of claim 15, in the invention of claim 2, the central roof faces the cable that connects the centrally arranged central member and the inner peripheral ring via one or more box-shaped cross-section sub-inner peripheral rings. A dome roof is provided in which a ring-shaped member is stretched, the height of the bottom surface is increased toward the inner ring, and the planar member is stretched on a cable connecting the bottom of each ring.
[0011]
According to the invention of claim 16, in the invention of claim 2, there is provided a dome roof in which a string string for reinforcing the central roof is disposed inside the central roof.
According to the invention of claim 17, in the invention of claim 16, there is provided a dome roof in which the restraining cable is extended inward from the outer periphery of the central roof and also serves as a stringed beam.
According to the invention of claim 18, in the invention of claim 17, a dome roof is provided in which the restraining cable passes through a pulley attached to an inner peripheral ring.
According to the nineteenth aspect of the present invention, there is provided a dome roof according to the seventeenth aspect, wherein the restraining cable penetrates the central roof.
[0012]
According to the invention of Claim 20, in the invention of Claim 2, the central roof includes a movable roof, and a dome roof that can be opened and closed is provided.
According to the invention of claim 21, in the invention of claim 20, the movable roof is configured to move on a rail arranged circumferentially on the inner peripheral ring, and a restraining cable is attached to the rail. A dome roof is provided.
[0013]
According to the invention of claim 22, in the invention of claim 2, there is provided a dome roof in which the suspension cable and the holding cable are connected by the connecting hanger member.
[0014]
According to the invention of claim 23, in the invention of claim 2, there is provided a dome roof having a vertical restraining cable extending substantially vertically downward from the inner peripheral ring and having a lower end fixed to the lower facility.
[0015]
According to the invention of claim 24, in the invention of claim 2, there is provided a dome roof in which the restraining cable is formed of a resin planar body and also serves as an outer roof.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, the first embodiment will be described. FIG. 1 is a diagram for explaining the dome roof according to the first embodiment, and a lower structure 10 is disposed around a ground G as a lower facility, for example, a baseball stadium. A slope 11 having a high outside is formed on the upper side of the body 10, and although not shown, chairs are arranged on the slope 11 to form a spectator stand.
[0017]
On the outer top portion 12 of the lower structure 10, an outer peripheral ring 20 having a box-shaped cross section is fixed. The outer ring 20 may be continuous over the entire circumference or may be divided. An annular inner peripheral ring 30 is supported by a suspension cable 50 extending inward from the upper end of the outer peripheral ring 20.
[0018]
An arch-shaped central roof 40 is attached on the inner ring 30. The central roof 40 is formed as a continuous body, for example, by placing a lightweight film material on a framework to which aggregates are combined, and the center is set to be the highest.
In order to prevent the central roof 40 from moving upward due to receiving wind from the bottom or the like, a holding cable 60 that connects the lower end of the outer ring 20 and the inner ring 30 is provided. They are connected by a connecting hanger 55. On the restraining cable 60, an outer roof 70 covering the upper part of the lower structure 10 is formed by stretching a membrane roof member R indicated by a wavy line in the drawing.
In addition, although the film | membrane-like roof member R was shown with the wavy line, this is for making it intelligible and is not necessarily wavy in this way.
[0019]
Since the suspension cable 50 supports the inner ring 30 and the central roof 40, the suspension cable 50 is lowered inward, that is, from the outer ring 20 side to the inner ring 30 side. On the contrary, it falls toward the outside, that is, from the inner ring 30 side toward the outer ring 20 side.
Therefore, the outer roof 70 is also inclined to the outside, and rain that has fallen on the central roof 40 and the outer roof 70 can be guided to the outside of the lower structure 10 at the time of rain.
[0020]
The first embodiment is configured as described above, and can cover the lower facility G while securing a high space.
[0021]
Next, a second embodiment will be described. FIG. 2 is a diagram showing the structure of the second embodiment, which differs from the first embodiment in that the string roof 45 made of cable material is provided inside the center roof 40 and the center roof 40 is reinforced. Others are the same as in the first embodiment. The second embodiment is configured as described above, and has an advantage that the strength of the central roof 40 is higher than that of the first embodiment.
[0022]
Next, a third embodiment will be described. FIG. 3 is a diagram showing the structure of the third embodiment, in which a portion of the string material 45 in the second embodiment is suppressed and the cable 60 is extended through a pulley 101 attached to the lower side of the inner peripheral ring 30. Formed. The third embodiment is configured as described above, and has an advantage that the number of cable fixing points is reduced as compared with the second embodiment.
[0023]
Next, a fourth embodiment will be described. FIG. 4 is a view showing the structure of the fourth embodiment. In the first to third embodiments, the suspension cable 50 is located above the restraining cable 60. In the fourth embodiment, conversely, the suspension cable 50 is located below the restraining cable 60. Therefore, the inner peripheral ring 30 having a larger height dimension than that of the first to third embodiments is used. However, the point that the suspension cable 50 and the holding cable 60 are connected by the connection hanger 55 remains the same.
[0024]
The restraining cable 60 is configured such that its outer side is lowered in order to suppress its purpose, that is, the upward movement of the central roof 40. Therefore, also in the fourth embodiment, the membrane roof member R forming the outer roof 70 is stretched on the restraining cable 60 in order to guide rain to the outside of the lower structure 10.
[0025]
The fourth embodiment is configured as described above, and when the height of the lower end of the inner ring 30 is the same as that of the first to third embodiments, the height of the inner ring 30 itself. Therefore, the central roof 40 and the outer roof 70 are arranged at positions higher than those of the first to third embodiments, and the audience at the stand can enjoy a greater sense of openness.
[0026]
In the fourth embodiment, the outer ring 20 is made smaller, while the lower end of the inner ring 30 has the same height as in the first to third embodiments. Although the portion is extended upward, the height of the outer portion of the lower structure 10 is made the same as in the first to third embodiments, and the outer ring 20 is also made the same as in the first to third embodiments. The suspension cable 50 and the holding cable 60 may be attached to the upper part of the outer ring 20.
[0027]
Next, a fifth embodiment will be described. FIG. 5 is a diagram showing the structure of the fifth embodiment. Like the fourth embodiment, the suspension cable 50 is arranged below the restraining cable 60. The end is not an inner ring, but is different from the fourth embodiment in that the end is attached to the central top 40c of the central roof 40. For this reason, the inner ring 30 is also set to have a small height as in the first to third embodiments. The fifth embodiment is configured as described above, and the position of the outer roof 70 becomes higher than that of the fourth embodiment, so that the audience can enjoy a greater sense of openness. In addition, since the outer roof 70 is extended to the center, the central roof 40 can be made of only aggregate.
[0028]
Next, a sixth embodiment will be described. FIG. 6 is a diagram showing the structure of the sixth embodiment. Compared to the fifth embodiment, the restraining cable 60 penetrates the middle part (between the top and the lower part) 40 m of the central roof 40. The difference is that the inner end is attached to the inner surface of the central roof 40 to reinforce the central roof 40. Further, the suspension cable 50 and the holding cable 60 are not connected by a connecting hanger, and a sealed air space 80 in which air (shown in a satin-like shape) is packed in a bag 81 is provided between them. . By providing such a sealed gas space 80, heat insulation from the outside is improved, and energy required for internal air conditioning can be reduced. In addition, a sound absorbing effect can be expected.
[0029]
Next, a seventh embodiment will be described. FIG. 7 is a diagram showing the structure of the seventh embodiment, in which a central roof 40 is supported by an inner peripheral ring 30 and an annular outer central roof 41, and the outer central roof 41 is divided via an inner peripheral ring 31. The inner end portion of the restraining cable 60 is attached to the inner side of the divided inner peripheral ring 31. In this way, by dividing the central roof 40 by the divided inner ring 31, the central roof 40 can be made to have partially different specifications instead of having a uniform specification. For example, the inner central roof 42 can be an open / close roof.
[0030]
Next, an eighth embodiment will be described. FIG. 8 is a diagram showing the structure of the eighth embodiment. This eighth embodiment differs greatly from the first to seventh embodiments in that a cable with a central roof is stretched. A membrane-like roof member is attached.
That is, as in the first embodiment, there is an inner ring 30 connected by the suspension cable 50 and the holding cable 60, where the inner ring 30 has a height, The upper part and the upper part of the outer ring 20 are connected by an auxiliary cable 90. The sub-inner ring 31 is supported by the first sub-suspending cable 51 and the first sub-holding cable 61 from the inner ring 30, and the sub-inner ring 31 also has a height. The upper part of the inner ring 30 and the upper part of the inner ring 30 are connected by a secondary auxiliary cable 91. The sub-inner periphery 31 and the central member 43 disposed at the center are connected by the second sub-suspending cable 52 and the second restraining cable 62.
A membrane-like roof member R similar to that stretched on the restraining cable 60 is stretched not only on the restraining cable 60 but also on the first subsidiary restraining cable 61 and the second subsidiary restraining cable 62. Thus, a central roof 40 is formed.
The eighth embodiment is configured as described above, and can be made much lighter than an integrated arched central roof as shown in the first to seventh embodiments.
[0031]
Next, a ninth embodiment will be described. FIG. 9 is a diagram for explaining the structure of the ninth embodiment. The inner ring 20 and the inner edge of the lower structure 10 in the first embodiment are connected by a vertical restraining cable 55, and the restraining cable 50 is connected. In addition, the vertical restraining cable 55 also restrains upward movement of the central roof 40. Since 9th Embodiment is comprised in this way, the restraining cable 60 can be made thin or small.
[0032]
Next, a tenth embodiment will be described. FIG. 10 is a partial perspective view showing the structure of the inner peripheral ring 30 according to the tenth embodiment. The inner peripheral ring 30 includes a ring cable 30C and a connection tool 30G attached to the ring cable 30C. The suspension cable 50, the restraining cable 60, and the central roof 40 (aggregate) are attached to. The tenth embodiment is configured as described above, and the inner ring 30 can be formed to be lightweight.
[0033]
Next, an eleventh embodiment will be described. In this case, when the movable roof rail 30 </ b> R is attached on the inner ring 30, the inner end of the suspension cable 50 is attached to the rail 30 </ b> R. FIG. 11 is a diagram for explaining the eleventh embodiment. A rail 30R is mounted on an inner ring 30 having a box-shaped cross section, and a cable mounting tool 35T is fixed to the rail 30R. The restraint cable 60 is attached to the cable attachment tool. The suspension cable 50 is directly attached to the inner peripheral ring 30.
Since a pulling force acts on the rail when the holding cable is attached, it is preferable that the rail is pre-tensioned at the time of assembly so that a compressive force that cancels the pulling force is generated after assembly.
[0034]
FIG. 12 is a view showing an example of the structure of the movable roof that moves on the rail, and is a type in which half of the roof is opened and closed. 40S is attached. The movable half roof 40M has a plurality of carriages 40B attached to its lower end, and the wheels (not shown) of the carriages 40B are mounted on the rail 30R fixed on the inner ring 30. It is designed to rotate.
[0035]
Next, how to stretch the suspension cable 50 and the holding cable 60 will be described. FIG. 13 shows the most general tensioning method in which one point on the outer ring 20 and one point on the inner ring 30 are connected. On the other hand, in FIG. 14, a plurality of points (three points) on the outer ring 20 and one point on the inner ring 30 are connected. As shown in FIG. 14, the number of the suspension cables 50 and the holding cables 60 is increased, but a thin cable can be used because the force is distributed.
[0036]
FIGS. 13 and 14 are both shown in which the inner ends of the suspension cable 50 and the holding cable 60 are attached to the outside of the inner peripheral ring 30, but FIG. 15 shows the suspension cable 50, The inner end of the holding cable 60 is attached to the inner side of the inner ring 30. In this case, two cables from the outer ring are not passed through the center, and the whole is stretched so as to have a star shape, in order to obtain the height of the central part and to act on the inner ring. This is because a compression force is applied to the thrust force (tensile force) to be generated by the cable arrangement to prevent the thrust force from being twisted in the relaxed circumferential direction.
FIG. 16 is a perspective view showing the above-described tensioning method, and only the suspension cable 50 and the holding cable 60 that are stretched from one point on the outer peripheral ring 20 are shown for easy understanding.
[0037]
FIG. 17 is a side view of the above-described tensioning method, and shows a suspension cable 50 and a restraining cable 60 that are stretched from two points on the outer peripheral ring 20 that are located symmetrically with respect to the center.
When the tension is applied as shown in FIG. 17, the upper restraining cable 60 is located above the inner ring 30, making it difficult to attach the central roof 40, and the lower suspension cable 50 is located inside the inner ring 30. It passes through the lower side of the circumferential ring 30.
[0038]
FIG. 18 shows a structure in which such a defect is eliminated. A groove 30V is formed on the upper surface of the inner ring 30 in the direction in which the suspension cable 50 passes, and a pulley 102 is formed on the inner peripheral side of the groove 30V. The suspension cable 50 is passed through the lower side of the pulley 102, and the inner end of the cable is attached to the attachment point P located below the upper surface of the inner peripheral ring 30. A groove 30 </ b> W is formed on the lower surface of the circumferential ring 30 in the direction in which the restraining cable 60 passes, and a pulley 103 is attached to a lower portion on the inner circumferential side of the groove 30 </ b> W. The inner end is attached to the same attachment point P. By doing in this way, attachment of the center roof 40 becomes easy, and it is avoided that the restraining cable 60 passes under the inner peripheral ring 30 inside the inner peripheral ring 30.
[0039]
In FIG. 19, the restraining cable 60 is replaced with a CFRP (carbon fiber reinforced plastic) plate member 65. If it does in this way, weight reduction is also possible and it is not necessary to stretch | stretch the roof member R separately.
[0040]
The first to eleventh embodiments and the method of tensioning the cable have been described above. However, the embodiments can be appropriately combined within a consistent range. For example, the ninth embodiment can be combined with any other embodiment.
[0041]
【The invention's effect】
The invention described in each claim is a dome roof covering a large area of a lower facility without a pillar, but a central roof formed on the inner side is formed from an outer periphery support formed on an outer periphery of the lower facility. The central cable is supported by a suspension cable extending inward, and the upward movement of the central roof is suppressed by a restraining cable extending inward and upward from the outer periphery support, and a planar roof member is stretched on the restraining cable to form an outer roof. Therefore, the height of the roof of the central part is secured, but the roof of the outer part is low, so there is no waste and the air conditioning cost is low. There is no need to enlarge the support and the construction cost is low.
In particular, as in claim 4, the inner ring is composed of a ring cable and a joining member attached to the ring cable, and the suspension cable and the holding cable and / or the central roof are attached to the joining member. This will make the roof lighter.
In particular, as in claim 9, if a sealed gas layer is provided between the restraining cable and the suspension cable, the heat insulation is improved and the air conditioning cost is further reduced.
In particular, as described in claim 11, the suspension cable and / or the holding cable inward from the outer peripheral ring crosses the inner peripheral ring, and then the inner side of the inner peripheral ring at a circumferential position different from the crossed position. If it is made to attach to, a compressive force will act on an inner peripheral ring and safety will improve.
In particular, as in claim 15, the central roof is formed by stretching a planar member on a cable that connects a centrally arranged central member and an inner peripheral ring via one or more box-shaped cross-section inner peripheral rings. If the height of the bottom surface is increased toward the inner ring and the planar member is stretched on the cable connecting the bottom portions of the rings, the roof can be configured to be light.
In particular, as in the sixteenth aspect, if a string string for reinforcing the central roof is disposed inside the central roof, the strength of the central roof increases, and safety and durability are improved.
In particular, as described in claim 24, if the restraining cable is formed of a resin-made planar body and doubles as the outer roof, the roof can be made lighter, and the number of parts can be reduced and the construction can be simplified. .
[Brief description of the drawings]
FIG. 1 is a diagram illustrating the structure of a first embodiment.
FIG. 2 is a diagram illustrating the structure of a second embodiment.
FIG. 3 is a diagram illustrating the structure of a third embodiment.
FIG. 4 is a diagram illustrating the structure of a fourth embodiment.
FIG. 5 is a diagram illustrating the structure of a fifth embodiment.
FIG. 6 is a diagram illustrating the structure of a sixth embodiment.
FIG. 7 is a diagram illustrating the structure of a seventh embodiment.
FIG. 8 is a diagram illustrating the structure of an eighth embodiment.
FIG. 9 is a diagram illustrating the structure of a ninth embodiment.
FIG. 10 is a diagram illustrating the structure of a tenth embodiment.
FIG. 11 is a diagram illustrating the structure of an eleventh embodiment.
FIG. 12 is a view showing an open / close roof to which an eleventh embodiment is applied.
FIG. 13 is a diagram illustrating an example of how to stretch a cable.
FIG. 14 is a diagram showing another example of how to stretch a cable.
FIG. 15 is a diagram showing another example of how to stretch a cable.
16 is a perspective view of the tension shown in FIG.
17 is a view of the tension shown in FIG. 16 as viewed from the side.
18 is a modification of the tension shown in FIG.
FIG. 19 is a diagram showing an example in which the restraining cable is a CFRP plate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Lower structure 20 ... Outer ring 30 ... Inner ring 30C ... Ring cable 30G ... Connection member 30R ... Rail 30T ... Connection tool 30V, 30W ... Groove 35 ... Divided inner ring 40 ... Central roof 40B ... Cart 40M ... Movable Half roof 40S ... Fixed half roof 41 ... Outer center roof 42 ... Inner center roof 45 ... Stringed beam 50 ... Suspension cable 51 ... First sub suspension cable 52 ... Second sub suspension cable 60 ... Suppression cable 61 ... First suppression cable 62 ... Second restraining cable 70 ... outer roof 81 ... bag 90 ... auxiliary cable 91 ... sub-auxiliary cables 101, 102, 103 ... pulley G ... ground R ... (membrane-like) roof member

Claims (24)

It is a dome roof that covers a large area of the lower facility without pillars,
The central roof formed with a high inside is supported by a suspension cable extending inward from the outer peripheral support formed on the outer periphery of the lower facility, and the central roof is moved upward by a restraining cable extending inward and upward from the outer peripheral support. The dome roof is characterized in that an outer roof is formed by stretching a planar roof member on the restraining cable. The outer peripheral support is a box-shaped outer peripheral ring attached to the outer top of the lower structure forming the stand, the central roof is attached to the inner peripheral ring, and the suspension cable supports the inner peripheral ring. The dome roof according to claim 1. The dome roof according to claim 2, wherein the inner ring has a box-shaped cross section. The inner peripheral ring is composed of a ring cable and a joining member attached to the ring cable, and a suspension cable, a restraining cable, and / or a central roof are attached to the joining member. Dome roof. The dome roof according to claim 2, wherein the outer roof covers an upper part of the stand. The dome roof according to claim 2, wherein the holding cable is disposed below the suspension cable. The dome roof according to claim 2, wherein the holding cable is disposed above the suspension cable. The dome roof according to claim 7, wherein the restraining cable connects the center of the central roof and the outer ring. The dome roof according to claim 7, wherein a sealed gas layer is provided between the holding cable and the suspension cable. The dome roof according to claim 2, wherein the suspension cable and / or the holding cable extending from a plurality of outer mounting positions of the outer ring reach one inner mounting position of the inner ring. A suspension cable and / or a restraining cable heading inward from the outer ring is mounted on the inner side of the inner ring at a circumferential position different from the crossing position after traversing the inner ring. The dome roof according to claim 2. The dome roof according to claim 11, wherein the suspension cable and / or the holding cable pass through a pulley attached to the inner peripheral ring when traversing the inner peripheral ring. The dome roof according to claim 2, wherein the central roof is an arched roof formed by stretching a planar roof member on a roof frame in which aggregates are combined. The dome roof according to claim 2, wherein the central roof includes an annular outer central roof and an inner central roof. The central roof is composed of a cable that connects the central member arranged in the center and the inner ring through one or more box-shaped cross-sub-inner peripheral rings. The dome roof according to claim 2, wherein the flat member is stretched on a cable connecting the bottom portions of the rings. 3. The dome roof according to claim 2, wherein a string string for reinforcing the central roof is disposed inside the central roof. The dome roof according to claim 16, wherein the restraining cable extends from the outer periphery of the central roof to serve as a stringed beam. 18. The dome roof according to claim 17, wherein the restraining cable passes through a pulley attached to the inner ring. The dome roof according to claim 17, wherein the restraining cable passes through the central roof. The dome roof according to claim 2, wherein the central roof includes a movable roof and can be opened and closed. 21. The dome roof according to claim 20, wherein the movable roof is configured to move on a rail arranged circumferentially on the inner ring, and a restraining cable is attached to the rail. The dome roof according to claim 2, wherein the suspension cable and the holding cable are connected by a connecting hanger member. The dome roof according to claim 2, further comprising a vertical holding cable extending substantially vertically downward from the inner ring and having a lower end fixed to the lower facility. The dome roof according to claim 2, wherein the restraining cable is formed of a resin-made planar body and serves also as an outer roof.

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