JP3450490B2 - Roof structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roof structure suitable for forming a large space such as an arena or a stadium. 2. Description of the Related Art As is well known, various types of roof structures for forming a large pillar-free space, such as various shell structures, three-dimensional truss structures, suspension structures, and air film structures, have conventionally been used. Although practically used, various dome-shaped roof structures have recently been proposed as being suitable for use in particularly large spaces such as arenas and stadiums. For example, JP-A-5-148901 discloses a configuration in which a flat truss dome is reinforced by a radial cable, and JP-A-5-1446 discloses a plurality of ring-shaped members inside a compression ring located on the outer periphery. A dome-shaped cable truss in which cables are arranged at different heights is shown. [0003] However, among the above-mentioned examples, the former is capable of obtaining a good buckling stability by introducing an appropriate pre-stress into the cable to reduce the thrust of the entire dome and to obtain good buckling stability. While it has the advantage of being
Applying to a non-circular roof such as an oval has a disadvantage that prestress is excessive and is not practical. In addition, the latter can be applied to an elliptical roof, but since it has a structure mainly composed of cables, there is no problem when using a membrane material as a roof material, but it is unsuitable when using a normal rigid roof material. . [0004] It is an object of the present invention to eliminate any of the above-mentioned drawbacks of the conventional roof structure and to provide an effective structure which can be applied particularly to an elliptical roof. SUMMARY OF THE INVENTION The present invention provides a dome-shaped roof structure having a substantially elliptical planar shape and curving upward, and an outer ring truss having a substantially elliptical annular shape in plan view. A dome-shaped roof is formed as a whole by providing a plurality of inner peripheral ring trusses inside the roof so as to be concentrically and sequentially positioned so as to be located gradually upward, The outer ring truss is
The outer chord material, upper chord material, lower chord material each forming an elliptical ring,
A number of nearly vertical bundles connecting the upper and lower chords,
The inner ring truss is composed of a number of first diagonals connecting the outer chord and the upper chord and a number of second diagons connecting the outer chord and the lower chord. Annular upper and lower chords, a number of substantially vertical bundles connecting the upper and lower chords, and an upper chord in the inner ring truss and the outer ring or the other inner ring truss. A number of first connecting the upper chord
Of the inner ring truss, and a plurality of second diagonal members connecting the lower chord material of the inner ring truss and the upper chord material of the outer ring truss or another inner ring truss. periphery chords, upper chord member, lower chord member, Tabazai, first diagonal member, all of the second diagonal members are the steel formed by steel such as steel or steel pipe, each
The inner ring truss consists of upper chord, lower chord, bundle,
All of the material and the second diagonal material are made of steel such as steel frame or steel pipe.
Is a steel frame which is formed Ri, moreover, the lower surface of the roof, the tension cable that traverses along the roof by being extended between the long sides in the minor axis direction opposing the outer peripheral ring truss It is characterized by being provided. According to the present invention, a plurality of inner peripheral ring trusses made of a steel structure, like an outer ring truss made of a steel structure , each having an elliptical annular shape, are concentric in a plan view and in a central position in an elevational view. The dome-shaped roof is constructed as a whole by combining the objects in such a way that they become gradually higher. in this case,
The upper chord surface formed by the outer chord member, the upper chord member, and the first diagonal member constituting the outer ring truss and each inner ring truss forms a so-called single-layer lattice shell having a high horizontal rigidity. The lower chord surface formed by the two diagonal members and the lower chord member stiffens the single-layer lattice shell from the lower surface side, and effectively transmits the load particularly at the central portion to the outer peripheral side. further,
The outer ring truss located at the outermost circumference secures the torsional rigidity of the entire roof, and the tension cable installed on the outer ring truss ensures the buckling stability of this roof. Prevents deformation to spread. An embodiment of the present invention will be described below with reference to the drawings. 1 is an overall view of a roof R having a structure according to the present embodiment, FIG. 2 is a view showing only an upper chordal surface R1, FIG. 3 is a view showing only a lower chordal surface R2, FIG. 4 is a vertical sectional view, and FIG. Truss 1, 2a
FIGS. 6A and 6B are enlarged cross-sectional views of main parts showing the assembled state of FIGS. The roof R of the structure of the present embodiment is applied as a roof covering a large-scale space such as an arena or a stadium, and has a dome shape having a substantially elliptical planar shape. The length in the long side direction is about 200 m, and the length in the short side direction is about 150 m.
As shown in FIGS. 4 and 5, a plurality of roofs R of this embodiment are provided inside the outer ring truss 1 (4 in this embodiment).
Inner ring truss 2 (2a, 2b, 2c, 2d)
In the form of a concentric state and a progressively higher position closer to the center, and a structure in which the tension cable 3 is provided so as to cross the roof R in the short axis direction. ing. The outer peripheral ring truss 1 forms the outermost peripheral portion of the roof R. As shown in FIGS. 5 and 6, the outer peripheral chord member 11 is located on the outer peripheral side and the outer peripheral chord member 11 is located on the inner peripheral side. The upper chord member 12 located above, the lower chord member 13 located immediately below and below the outer peripheral chord member 11, and the upper chord member 12 and the lower chord member 13 are connected at predetermined intervals. A number of substantially vertical bundles 14 and a number of first bundles connecting the outer chord 11 and the upper chord 12 together.
And a large number of second oblique members 16 connecting the outer chord member 11 and the lower chord member 13 to each other, and has a triangular cross-sectional profile. Each of the members 11 to 16 constituting the outer peripheral ring truss 1 is formed of a steel material such as a steel frame or a steel pipe. Therefore, the outer peripheral ring truss 1 is made of a highly rigid pure steel frame. Further, each of the inner ring trusses 2a, 2
Reference numerals b and 2c denote the outer ring truss 1 in which the outer chord 11 is omitted, and the upper chord 22 and the lower chord 2
3, a bundle 24, a first diagonal member 25, and a second diagonal member 26. The inner ring truss 2d located at the innermost circumference is slightly different from the other inner ring trusses 2a to 2c, so that the central openings of the inner ring trusses 2a to 2c are collapsed in the short side direction and are omitted. Therefore, in the inner peripheral ring truss 2d, the upper chord member 22 and the lower chord member 23 are linear without forming an annular shape. The plurality of inner ring trusses 2a to 2d
The inner diameter of the outer ring truss 1 is set to be substantially the same as that of the outer ring truss 1 as shown in FIG. What
Note that these inner ring trusses 2a to 2d
Steel pipes or steel pipes are used as
Like the truss 1, it is entirely made of pure steel. The outer ring truss 1 and the inner ring truss 2a are connected by the first and second diagonal members 25, 26 of the inner ring truss 2a, as shown in FIG. It is performed by being connected to the material 12.
a and the inner peripheral ring truss 2b connected to the inner side of the first and second inner peripheral ring trusses 2b.
Are connected to the upper chord member 22 in the outer inner peripheral ring truss 2a. The same applies to the connection between the inner ring truss 2b and the inner ring truss 2c, and the connection between the inner ring truss 2c and the inner ring truss 2d. Further, on the lower surface side of the roof R assembled as described above, as shown in FIGS.
The tension cables 3 are provided between the opposite long sides of the outer ring truss 1. Both ends of the tension cable 3 are connected to the lower chord member 13 of the outer ring truss 1 and the lower chord member 23 of the inner ring truss 2d, respectively, and the central portion is connected or connected to the lower chord member 23 of the inner ring truss 2b. The lower surface of the roof R crosses along the short axis direction.
Prestress may be introduced into the tension cable 3 as needed. The roof R having the above structure is composed of an outer chord member 11, upper chord members 12, 22, and first diagonal members 15, 25, which constitute an outer ring truss 1 and inner ring trusses 2a to 2d connected to each other. And the upper chordal surface R1 (see FIG. 2) thus formed constitutes a so-called single-layer lattice shell.
The single-layer lattice shell naturally ensures excellent horizontal rigidity. The bundle members 14 and 24, the lower chord members 13 and 23, and the second diagonal members 16 and 26 that constitute the outer ring truss 1, the inner ring trusses 2a to 2d, respectively.
The lower chordal surface R2 (see FIG. 3) formed by the above-described method stiffens the above-described single-layer lattice shell from the lower surface side. In particular, the load at the center of the single-layer lattice shell is effectively transmitted to the outer peripheral side, and an excellent stiffening effect is obtained. can get. Furthermore, the outer peripheral ring truss 1 located at the outermost periphery and the inner peripheral ring truss 2a-
Since each of 2d is made of pure steel and has high rigidity, the torsional rigidity of the entire roof R is sufficiently secured by itself,
In addition, the buckling stability of the roof R is sufficiently ensured by the tension cable 3 laid on the outer ring truss 1, and it is ensured that the roof R is deformed so as to spread in the short side direction due to a vertical load. Is prevented. Therefore, according to the above-mentioned structure, there is no problem that the prestress is excessively large when applied to an elliptical roof as in the conventional structure, or that only a film material can be used as a roof material. In addition, it can realize a very effective roof that is light and structurally simple and clear, and has a low rise and excellent rigidity, and is suitable for application to a large-scale elliptical roof such as an arena or a stadium. Incidentally, the shape of the roof to which the structure of the present invention is applied is not limited to that of the above-described embodiment.
Any appropriate modification is possible as long as it is substantially elliptical, such as a racetrack shape as well as a geometric elliptical shape. The shape and dimensions of the outer ring truss and each inner ring truss can be arbitrarily changed as long as they can be combined to form a dome-shaped roof as a whole. The number of installations is not limited to four as in the above embodiment, but may be appropriately increased or decreased according to the size or form of the roof. Further, for example, the innermost inner ring truss 2 in the above-described embodiment.
It is also possible to omit d and provide an opening at the center of the roof, or to provide another roof that opens and closes the opening. As described above, the roof structure according to the present invention includes a steel-framed elliptical ring-shaped outer ring truss and a plurality of inner ring trusses that are concentric and central. Is gradually increased to form a dome-shaped roof as a whole, and a tension cable that crosses the roof in the short side direction is provided. Excellent horizontal rigidity and stiffening effect are obtained, and the outer ring truss
And the inner ring truss are both made of steel
Therefore, the torsional rigidity of the entire roof can be secured, and the buckling stability of this roof can be sufficiently secured by the tension cable, so that it can be effectively applied as a large-scale elliptical roof in arenas, stadiums, etc. You can do it.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view of a roof according to an embodiment of the present invention. FIG. 2 is a perspective view showing only the upper chordal surface of the roof. FIG. 3 is a perspective view showing only a lower chord surface of the roof. FIG. 4 is a vertical sectional view of the roof. FIG. 5 is a vertical sectional view showing an assembled state of the roof. FIG. 6 is a partially enlarged perspective view showing an assembled state of the roof. [Description of Signs] R roof 1 outer ring truss 2 (2a, 2b, 2c, 2d) inner ring truss 3 tension cable 11 outer chord material 12, 22 upper chord material 13, 23 lower chord material 14, 24 bundle material 15, 25 First diagonal members 16, 26 Second diagonal members.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichi Takase 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Nobuyuki Maeda 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Corporation (72) Inventor Naomori Taniguchi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Corporation (56) References JP-A-5-321336 (JP, A) JP-A-5-321 287811 (JP, A) JP-A-1-137035 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 7/08 E04B 1/32 102 E04B 1/34

Claims (1)

(57) [Claim 1] A dome-shaped roof structure having a substantially elliptical planar shape and curving upward, and an outer peripheral ring truss having a substantially elliptical annular shape in plan view is provided on the roof. A dome-shaped roof is formed as a whole by sequentially providing a plurality of inner peripheral ring trusses in a concentric manner and gradually positioned above the inner peripheral ring truss. The ring truss is composed of an outer chord, an upper chord, a lower chord, a number of substantially vertical bundles connecting the upper chord and the lower chord, and a number of substantially vertical bundles connecting the outer chord and the upper chord. The inner ring truss includes a first diagonal member, a plurality of second diagonal members connecting the outer chord member and the lower chord member, and the inner peripheral ring truss has an elliptical annular upper chord material, a lower chord material, and their upper chords. A number of almost vertical connecting the lumber and lower chord And Tabazai such, a plurality of first diagonal member connecting the upper chord member in said outer peripheral ring truss or other of the inner peripheral ring truss and the top chord member in the inner peripheral ring truss,
The inner ring truss is composed of a plurality of second diagonal members connecting the lower chord material and the outer ring truss or the upper chord material of another inner ring truss. Material, lower chord material,
All of the bundle material, the first diagonal material, and the second diagonal material are made of steel such as a steel frame or a steel pipe, and each of the inner ring trusses includes an upper chord material, a lower chord material, a bundle material,
All of the first and second diagonal members are steel such as steel frames or steel pipes.
A tension cable that is formed of a steel member and that is laid between opposed long sides of the outer peripheral ring truss on the lower surface side of the roof so as to traverse the roof along its short axis direction. A roof structure characterized by being provided with.