JPH08260605A - Large-span floor structure system - Google Patents

Abstract

PURPOSE: To provide a system of a large span floor structure superior in profitability and reliability by a new truss structure. CONSTITUTION: A pair of upper chords 51 constituted by steel tube concrete filled with concrete in a steel tube and a pair of lower chords 52 constituted by a prestressed steel tube inserting PC steel material in the steel tube are equipped. The upper chords 51 are formed flat, the lower chords are shaped in the form of a downward projection-like arrow, and an interval of the center part of the lower chords 52 is formed to be narrowed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large span floor structure system, and more particularly, it can form a ceiling portion of a large building such as an arena facility and can also be used as a flat plaza. The present invention relates to a span floor structure system.

[0002]

2. Description of the Related Art As is well known, a truss structure is known as a structure capable of obtaining a large span without providing columns. This truss structure opposes the load by the compressive force of the upper chord member and the tensile force of the lower chord member. Further, in the conventional truss structure, the upper chord member is generally curved or projected upward.

[0003]

Therefore, there is a limit in applying the conventional truss structure to a building having a larger span. That is, in order to obtain a long span, it is necessary to increase the cross-sectional area of the upper chord member and the lower chord member to increase the resistance against the load. Therefore, not only is the weight of the structural material increased, but problems such as economy and safety increase. Moreover, the reliability decreases as the length increases. On the other hand, in order to have a floor structure, the upper chord member side must be formed flat. Therefore, the present situation is that it is not possible to construct a floor structure with a long span by the conventional truss structure. The present invention has been proposed in view of the above, and an object thereof is to provide a large span floor structure system excellent in economy and reliability by a new truss structure.

[0004]

In order to achieve the above object, the present invention is a large span floor structure system including a truss structure in which an upper chord member and a lower chord member are joined by a vertical member or a diagonal member, and An upper chord member made of concrete filled steel pipe concrete and a lower chord member made of a prestressed steel pipe in which a PC steel member is inserted into the steel pipe are provided to form the upper chord member flat and to project the lower chord member downward. Forming a main truss in which the upper chord member and the lower chord member are connected by a vertical member or a diagonal member,
A plurality of the main trusses are arranged side by side, and each main truss is connected by a bridge truss.

[0005]

[Operation] An upper chord member made of steel pipe concrete filled with concrete against the compressive force of load,
Since the lower chord member constituted by the prestressed steel pipe in which the PC steel member is inserted opposes the tensile force of the load, the cross-sectional area of the steel member constituting the truss can be reduced. Further, a flat floor structure can be formed by the upper chord members arranged in parallel.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an illustrated embodiment. FIG. 1 is a front view showing a schematic structure of an arena facility 1 to which a large span floor structure system according to the present invention is applied. The arena facility 1 includes a foundation structure portion 2 and a lower structure portion 3, a stand portion 4, and a ceiling / floor structure portion 5.
And a roof structure portion 6.

The foundation structure portion 2 is constituted by, for example, a cast-in-place concrete pile 21, and the lower structure portion 3 is constituted by a main column 31 which copes with a large axial force and has increased rigidity. This main column is 31, steel pipe concrete (CFT: Concrete Filled Stee)
It is equipped with a CFT structure by a tube.

The stand portion 4 is provided with a raised floor 41, and this raised floor 41 is constituted by, for example, a precast (PCa) raised floor to shorten the construction period.

The ceiling / floor structure portion 5 is constituted by the large span floor structure system according to the present invention. That is, the large span floor structure system is configured by connecting a plurality of main trusses 53 including upper chord members 51 and lower chord members 52 to each other by bridge trusses 54.

The main truss 53 connects two substantially parallel upper chord members 51 by an upper cross member 55, as shown in FIGS. 3 and 4, for example. On the other hand, the lower chord member 52 is formed in an arcuate shape that is curved downward in a convex shape, and is connected by a lower cross member 56 so that the interval between the central portions becomes narrow. A diagonal member 57 is connected between the upper chord member 51 and the lower chord member 52.

The upper chord member 51 is made of concrete 9 in the pipe.
It is composed of steel pipe concrete (CFT) filled with 1. On the other hand, the lower chord member 52 is made of a prestressed steel pipe having a PC steel member 92 inserted therein. This is shown in Figure 2.
This is because the upper chord member 51 opposes the load by compression, and the lower chord member 52 opposes the load by tension and prestressing, as in the conceptual diagram showing the direction of the force in the prestressed beam of (B). Note that FIG. 2A is a conceptual diagram showing the direction of force in the simple support beam.

Upper chord member 51 using this steel pipe concrete
According to the above, the rigidity and compressive strength of the upper chord member 51 are increased, and the cross-sectional area of the steel pipe can be reduced. In addition, due to the reduction of the steel material and the welding size, it becomes possible to shorten the construction period and the cost.

On the other hand, according to the lower chord member 52 using the prestressed steel pipe, most of the tensile force can be applied to the PC steel member 92 having no joint portion, and the reliability is improved. Further, since the tensile force is controlled, the cross-sectional area of the lower chord member 52 can be made small, that is, the diameter can be made small.
You can make 3 look beautiful. Moreover, due to the reduction of the steel material and the welding size, it is possible to shorten the construction period and the cost.

A plurality of main trusses 53 having the above-mentioned structure are arranged side by side, and each main truss 53 is connected by a bridge truss 54 so that each upper chord member 51 forms a flat floor surface. This floor can form a plaza 7, as will be described later.

As shown in FIG. 5 (A) showing the skeleton of the structural material, the roof structure portion 6 installed above the floor structure portion is a hybrid truss consisting of two keel trusses 61 and a cross truss 62 crossing them. It is a structure. The V shape of the keel truss 61, in other words, 2
The opening degree of the one keel truss 61 is determined by the position of the support point, that is, the position of the main column 63 described later. The keel truss 61 is supported by three large columns 63. This large pillar 63 transmits the vertical load directly to the foundation,
The load on the large span floor structure described above is reduced.

The keel truss 61 is tilted slightly from a vertical plane so as to form an arch which is integral with the cross truss 62. Therefore, the line of the roof is made to look soft and the axis with the entrance 71 is made coincident with each other to achieve design matching. Then, the space of each truss has a film structure or a glass roof structure. Also, adjust the internal air pressure to maintain stability during strong winds such as typhoons. In the case of a roof structure having such a truss structure, even if a part is damaged due to a natural disaster such as an earthquake or a human disaster such as a fire, the entire structure does not collapse at one time and safety is improved. It is expensive and can protect life and property, and can also be used as an evacuation site.

Incidentally, FIG. 5 is a skeleton diagram showing the structural material. As mentioned above, (A) is the roof structure portion 6, (B).
Is a ceiling / floor structure part 5 with a large span floor structure system,
(C) shows the arena facility main body 11, respectively.

6 and 7 are more specific explanatory views of the arena facility 1 to which the large span floor structure system according to the present invention is applied. That is, this arena facility 1, for example,
It has an underground part used as a warehouse, a preparation room, or a machine room, a spectator seat 42, a box seat, an above-ground part used as a passage, and a plaza 7 formed above the ceiling part. The roof structure portion 6 of the open space 7 is formed in a state of being unevenly distributed with respect to the arena facility body 11.
That is, the center of the roof structure portion 6 is formed in an eccentric state from the ground portion 12 formed in the center of the arena facility 1, which is a novel design. Also,
In this plaza 7, a small space is provided, which is divided by forming a small dome 72.

Although the present invention has been described above with reference to the embodiments shown in the drawings, the present invention is not limited to the above-described embodiments, but can be appropriately implemented without changing the configurations described in the claims. For example, in the above description of the embodiment,
Although the arena facility is explained, it can be used for other large buildings. Also, although the open space with the roof above the large span floor structure has been described, the open space can be naturally opened without providing the roof.

[0020]

In summary, the present invention is a large span floor structure system having a truss structure in which an upper chord member and a lower chord member are joined by a vertical member or a diagonal member, which is made of steel pipe concrete in which concrete is filled in the steel pipe. And a lower chord member constituted by a prestressed steel pipe in which a PC steel member is inserted into the steel pipe. The upper chord member is formed flat and the lower chord member is formed in a downward convex bow shape. A main truss in which the upper chord member and the lower chord member are connected by a vertical member or a diagonal member is formed, and a plurality of main trusses are arranged in parallel, and each main truss is connected by a bridge truss, so that the cross-sectional area of the truss member is reduced. In addition, the rigidity and compressive strength of the upper chord member can be increased. Further, it is possible to reduce the steel material and the welding size, and it is possible to shorten the construction period and the cost. on the other hand,
Since the lower chord member can bear most of the tensile force due to the load on the PC steel member having no joint portion, the reliability is improved and the cross-sectional area of the lower chord member can be reduced. Therefore, it can be visually beautiful. Moreover, by reducing the steel material and welding size, it is possible to shorten the construction period and reduce the cost. Then, by arranging a plurality of main trusses to which the upper chord member and the lower chord member are applied in parallel, a flat and large-area floor surface can be formed on the upper surface side of the upper chord member,
It is possible to form a plaza on top of the building.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic structure of an arena facility to which a large span floor structure according to the present invention is applied.

FIG. 2 is a conceptual diagram of a truss structure, (A) shows a simple support beam, and (B) shows directions of forces in a prestressed beam.

FIG. 3 is a partially cutaway perspective view of a truss structure according to the present invention.

FIG. 4 is a perspective view of a truss structure according to the present invention.

FIG. 5 is a skeleton diagram showing a structural material, (A) shows a roof structure part, (B) shows a ceiling-floor structure part by a large span floor structure system, and (C) shows an arena facility body.

FIG. 6 is an explanatory diagram of the inside of an arena facility.

FIG. 7 is an explanatory diagram of the entire arena facility.

[Explanation of symbols]

 1 Arena facility 2 Basic structure part 3 Stand part 5 Ceiling / floor structure part 6 Roof structure part 7 Square 51 Upper chord member 52 Lower chord member 53 Main truss 54 Bridge truss 55 Upper horizontal member 56 Lower horizontal member 57 Slanting member

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Leslie Earl Robertson New York 10128 New York East 8th Street 45

Claims (2)

[Claims] 1. A large-span floor structure system comprising a truss structure in which an upper chord member and a lower chord member are joined by a vertical member or a diagonal member, wherein the upper chord member is made of steel pipe concrete filled with concrete in a steel pipe, and a steel pipe. A lower chord member constituted by a prestressed steel pipe having a PC steel member inserted therein, the upper chord member is formed flat, and the lower chord member is formed in a downward convex bow shape. A large-span floor structure system characterized in that a main truss in which the main trusses are connected by vertical members or diagonal members is formed, and a plurality of the main trusses are arranged side by side, and each main truss is connected by a bridge truss. 2. The large-span floor structure system according to claim 1, wherein the pair of lower chord members are formed in an arc shape which is curved downward in a convex shape, and are formed so that a space between central portions thereof is narrowed.