JPH05339987A - Frame structure - Google Patents

Abstract

PURPOSE:To lengthen the span for the title structure with simple ways of construction in combination with plane truss while making the structure available for construction of entire or a part of structure in large columnless space such as sports facilities, events halls, production and distribution facilities, etc., and general buildings for other purposes. CONSTITUTION:A plurality of beam-like trusses 4 are arranged radially and are laid in crossing with one another, and ends 4a of adjoining trusses 4 are connected with tension bars 5 made up of pole plates or the like. The tension bars arranged between each of the ends are connected with one another to form a surrounding frame 6 in a polygonal shape. The truss 4 is made up in such a shape where the lower chord thereof is warped upward. Since horizontal displacement on the ends 4 is restrained by the tension bars 5, construction of a structure having a large span can be materializewd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure applied to a roof or floor of a pillarless large space in sports facilities, event venues, production / distribution facilities, etc., or a roof or floor of a general building.

[0002]

2. Description of the Related Art In recent years, in sports facilities, event venues, production / logistics facilities, etc., there is a demand for a pillarless large-scale building because of the flexibility of changing the layout of installed equipment and the comfortable environment with a good perspective. ing. In order to realize such a pillar-less large space, a large-span roof truss is required, and a multi-story floor beam with a large span is required. However, it is difficult to construct a large span with the conventional plane truss. Therefore, a structure such as a three-dimensional truss or a structure in which prestress is introduced into a plane truss is adopted.

[0003]

The three-dimensional truss has the excellent characteristics of being lightweight and strong against buckling, but on the other hand, the joint structure of the nodal portions is complicated, which makes it difficult to manufacture and the cost is high. There is a point. In addition, in the structure that introduces prestress to the truss, there is adopted a structure that pushes the column base inward so that the lifting force acts on the central part of the truss, but this makes the support structure of the column base complicated. There is a problem.

The object of the present invention is to combine a plane truss into a lightweight and tough one such as a space truss, and it can be applied to a large span structure. Moreover, the structure is simple and easy to manufacture, and the cost can be reduced. It is to provide a frame structure.

[0005]

In the frame structure of the present invention, a plurality of beam-shaped trusses in which the lower chord member has an upward warp are provided so as to radially intersect with each other, and the ends of adjacent trusses are respectively provided with tension bars. It is connected. The tension bars are connected to each other in a polygonal shape to form an annular frame. The truss may be ramen.

[0006]

According to this structure, due to the upward warp of each truss, it is liable to undergo horizontal displacement such that its end portion moves outward due to vertical load such as its own weight or loading load.
This horizontal displacement is restrained by pulling the tension bar. That is, the force for horizontally displacing the end portion of the truss in each direction acts in balance so as to widen each portion of the annular frame configured by the tension bar. Therefore, pulling of the tension bar restrains the horizontal displacement of each truss end. In this way, the horizontal displacement of the truss end is restrained, so there is no effect on the lower structure,
Also, it becomes possible to increase the span. Similar effects can be obtained when ramen is used instead of truss.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. The frame structure 1 constitutes a square roof made of steel and is constructed on a lower structure 3 composed of four columns 2. The frame structure 1 is provided by intersecting two beam-shaped trusses 4 and 4 spanning between diagonal columns 2, and adjacent ends of these trusses 4 and 4 function as tension bars. 5 are connected and configured. The eaves girders 5 are connected to each other in a rectangular shape to form an annular frame 6.

The truss 4, as shown in FIG.
The lower chord member 8 is composed of the lower chord member 8, the bundle member 9, and the diagonal member 10. The lower chord member 8 has a shape having a warp on the upper side so that the central portion is higher than the end portion by the warp height H. The upper and lower chord members 7 and 8 of the two intersecting trusses 4 and 4 are joined to each other above and below the central bundle member 9a.

According to this structure, each truss 4 is warped upward, so that a vertical load such as its own weight causes a horizontal displacement so that the end 4a moves outward as shown by an arrow F in FIG. However, this horizontal displacement is restrained by the pulling of the eaves girder 5. That is, the force for horizontally displacing the end portion 4 a of the truss 4 in each direction acts in a balanced manner so as to widen each portion of the annular frame 6 configured by the eaves girder 5. Therefore, the pulling of the eaves girder 5 restrains the horizontal displacement of each truss end 4a.

As described above, since the horizontal displacement of the truss end 4a is restrained, the lower structure 3 is not affected and the span can be increased. In this way, by combining the horizontal trusses 4, it is possible to obtain a lightweight and excellent strength like a three-dimensional truss, and moreover, the structure is simple and the manufacturing is easy, and the cost can be reduced.

If a tension is introduced in advance by tensioning a wire rope to each eaves girder 5, the strength can be further improved and the span can be increased. Further, instead of the eaves girders 5, a tension bar dedicated to bear a tensile force may be provided between the truss ends 4a to configure the frame structure 1.

Further, the truss 4 may be of a type in which an upper chord member 7 and a lower chord member 8 are parallel to each other as shown in FIG. Instead of the truss 4 shown in FIGS. 3 and 4, a beam-shaped ramen may be used. Furthermore, the present invention is shown in FIG.
The present invention can be applied to general polygonal frame structures such as the frame structure having a triangular planar shape shown in FIG. 6 and the hexagonal frame structure shown in FIG.

[0013]

According to the frame structure of the present invention, a plurality of beam-shaped trusses in which the lower chord member has an upward warp are provided so as to cross each other radially, and the ends of adjacent trusses are connected by tension bars. Therefore, the horizontal displacement of the truss end, which is about to occur due to the vertical load, is restrained by the tension bar pulling. Therefore, in the combination of horizontal truss,
It is lightweight like a three-dimensional truss and has excellent strength, can build a large span, and has a simple structure and is easy to manufacture.
The effect is that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a frame structure according to an embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a side view of the truss.

FIG. 4 is a side view of a truss according to another embodiment of the present invention.

FIG. 5 is a plan view of still another embodiment of the present invention.

FIG. 6 is a plan view of still another embodiment of the present invention.

[Explanation of symbols]

1 ... Frame structure, 2 ... Pillar, 3 ... Lower structure, 4 ... Truss, 5
… Eaves girder (tension bar), 6… Annular frame, 8… Lower chord material

Claims (2)

[Claims] 1. A plurality of beam-shaped trusses in which a lower chord member has an upward warp are provided so as to cross each other in a radial direction, and the ends of adjacent trusses are connected to each other by tension bars, and these tension bars form a polygon with each other. A frame structure that forms a connecting annular frame. 2. A frame structure in which the truss according to claim 1 is used as a rigid frame.