JP2787266B2 - Roof structure and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roof structure in a large-scale facility such as a baseball stadium and a sports field.

[0002]

2. Description of the Related Art In recent years, a roof structure covering the entire facility has been provided so that a baseball field, an athletic field and the like can be used without being affected by the weather. As the roof structure, an air film structure, a roof plate having a rigid roof plate that can be opened and closed as necessary, a cable dome combining a steel frame and a cable (for example, see Japanese Patent Application Laid-Open No. Sho 62-101765). In addition, a beam string structure having a combination of a steel truss and a cable has been proposed and put into practical use.

[0003]

However, in the above-mentioned conventional roof structure having an air film structure, although the weight can be reduced, the power cost is increased due to the pressurization of the facility, and the airtightness in the facility is maintained. In addition, there are disadvantages that the structure of the opening such as the entrance is complicated, and it is not possible to compete in a natural environment. In addition, in a conventional roof structure with a top opening, in order to cope with the blowing force acting on the roof opening, the roof slab is reinforced, or the roof slab is connected to a foundation such as a building or the ground by using struts. In the former case, the roof slab is heavier, and in the latter case, there is an inconvenience that the columns hinder the view from the grandstand. Further, in the above-mentioned conventional roof structure using a cable, although the weight can be reduced, there is a disadvantage that an opening cannot be provided at the top.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A first object of the present invention is to provide a simple structure which can reduce the weight and can sufficiently cope with the blowing force acting on the roof. An object of the present invention is to provide a structural roof structure.

A second object of the present invention is to provide a method for constructing a roof structure which can be easily constructed by using a conventional construction technique.

[0006]

In order to achieve the first object, a roof structure according to a first aspect of the present invention comprises a truss frame member formed by connecting an upper chord member and a lower chord member through an abdominal member. Combining a plurality of them to form a substantially frustum-shaped roof slab having a polygonal opening at the top, and the opening frame at the top of the roof slab is formed by combining a plurality of girders and the opening frame is formed. Connecting the lower part of each intersection of the girder constituting the vertex of the girder with the supporting hardware for supporting the outer part of the roof slab at a portion corresponding to the intersection with a cable, and tensioning each cable. In this case, a compressive force is applied to the outer shell of the roof slab, and a tensile force is applied to the opening frame in advance.

In order to achieve the second object,
The method for constructing a roof structure according to the second invention is characterized in that a plurality of truss frame members formed by connecting an upper chord material and a lower chord material via a belly material are combined, and a substantially frustum shape having a polygonal opening at the top is provided. After the opening frame at the top of the roof plate is formed by connecting a plurality of beams, the outer shell of the roof plate is supported at each portion corresponding to the top of the opening frame. The upper part, and then the lower part of each intersection of the girders forming the apex of the opening frame and the supporting hardware for supporting the roof slab at a site corresponding to the intersection were connected by cables. Thereafter, the cables are tensioned simultaneously.

[0008]

According to the roof structure according to the first aspect of the invention, the roof structure is constructed by assembling the roof slab and supporting the outer shell of the roof slab on the support hardware, and then simultaneously tensioning all the cables. This is performed by raising the roof slab on a supporting hardware. When the cable is tensioned, a compressive force is stored in the outer shell of the roof slab, and a tensile force is stored in the opening frame forming the inner shell of the roof slab.

In use, a compressive force acts on the opening frame and a tensile force acts on the outer rim of the roof slab. These tensile forces cancel out the tensile force and the compressive force previously introduced when the cable is tensioned. Therefore, the load borne by each of the opening frame and the shell of the roof slab can be small. In addition, when a blowing force due to the wind acts on the roof slab, the opening frame acts as a counterweight, so that the blowing force can be sufficiently dealt with. Furthermore, since prestress is introduced into the outer frame of the opening frame and the roof slab due to the tension of the cable,
The outer frame of the opening frame and the roof slab can have sufficient strength while reducing the size and weight of the structural member.

According to the method for constructing a roof structure according to the second aspect of the present invention, after assembling the roof slab, attaching the opening frame, and attaching the cable simultaneously with attaching the supporting hardware, the known method is used. By simultaneously tensioning all the cables in the outward direction of the roof slab by the tensioning technique, the roof slab can be raised with the supporting hardware as a fulcrum.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a roof structure, FIG. 2 is a plan view of the roof structure, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. 4 is line BB in FIG. FIG.

In these figures, reference numeral 1 denotes a roof slab, and the roof slab 1 is constituted by combining a plurality of truss frame members 2 formed by connecting an upper chord material and a lower chord material via a web material, and has a polygonal opening at the top. It has a substantially frustum shape having a portion 3. The inner shell of the roof slab 1 is composed of a reinforcing ring 4 and an opening frame 5 inscribed in the reinforcing ring 4, and the outer shell is a reinforcing ring 6.
And a reinforcing ring 7 is provided substantially at the center between the reinforcing rings 4 and 6.

The opening frame 5 is formed by connecting a plurality of girders 5a. The girder 5a is a truss frame material formed by connecting an upper chord material and a lower chord material via a belly material, and is connected to the inner hull of the roof slab 1 and is vertically provided. This girder 5a
3 and 4, the lower part of the girder 5 a may protrude inward or outward of the opening 3, as well as in a state of standing vertically as shown in FIGS.

The outer shell of the roof slab 1 is supported on a support hardware 10 fixed on a frame of a support structure 9 constituting a stand for spectators surrounding the ground 8.

The supporting hardware 10 is moved from a position corresponding to the vertex 5b of the opening frame 5, that is, from the position O on the ridge L in the opening 3 when the roof slab 1 is viewed in a plane. Of the roof slab 1 is supported at a portion where a straight line t drawn radially through each vertex 5b intersects the outline P of the roof slab 1.

The position O on the ridge L is, for example, as shown in FIG. 2, when the vertex 5b of the opening frame 5 is located at a position facing the convex arc-shaped portion of the outline P. If the vertex 5b of the opening frame 5 is located at or near the center, not shown, but facing the linear portion of the outline P, the vertex 5b
Are set in accordance with the shape of the contour line P, such as a portion facing.

The lower part of the intersection of the girders 5a forming the apex 5b of the opening frame 5 and the supporting hardware 10 corresponding to the intersection (the apex 5b) are respectively connected by a cable 11. By tensioning the cables 11, a compressive force is applied to the outer shell of the roof slab 1 and a tensile force is applied to the opening frame 5 in advance.

In the above construction, the roof structure is constructed by assembling the roof slab 1 and supporting the outer shell of the roof slab in the inward direction of the roof slab 1 with the support hardware 10 and then connecting all the cables 11. At the same time, the roof slab 1 is raised on the supporting hardware 10 by being tensed, and then the outer shell of the roof slab 1 is fixed on the supporting hardware 10. When the cable 11 is tensioned, a compressive force is stored in the outer shell of the roof slab 1, and a tensile force is stored in the opening frame 5 constituting the inner shell of the roof slab 1.

In the use state, a compressive force acts on the opening frame 5 and a tensile force acts on the outer shell of the roof slab 1. These tensile force and compressive force are previously introduced when the cable 11 is tensioned. Therefore, the forces borne by the opening frame 5 and the outer shell of the roof slab 1 can be small.
In addition, even if the wind blowing force works on the roof slab 1,
Since the opening frame 5 acts as a counterweight, it is possible to sufficiently cope with the blowing force. Furthermore, since the prestress is introduced into the opening frame 5 and the outer shell of the roof slab 1 due to the tension of the cable 11, the structural members can be reduced in size and size.
The outer frame of the opening frame 5 and the roof slab 1 can have sufficient strength while reducing the weight.

In this embodiment, the metal support 10 is fixed on the frame of the support structure 9, but it may be fixed on a foundation such as the ground.

Although the roof slab 1 has a substantially elliptical shape in plan view, it may have a circular shape, a polygonal shape, or the like.

Next, a method for constructing a roof structure according to the present invention will be described.

First, after assembling the roof slab 1, attaching the opening frame 5, and attaching the supporting hardware 10, the cables 11 are assembled at the same time. Then, all the cables 11 are indicated by arrows in FIG. As shown, the roof slab 1 is simultaneously tensioned outward. Thereby, as shown by the imaginary line in FIG. 3, the outer shell of the roof slab 1 slides on the support hardware 10 in the inward direction of the roof slab 1 and the opening frame 5 is enlarged, so that the roof slab 1
Is raised on the supporting hardware 10. After the cable 11 is simultaneously tensioned, the shell of the roof slab 1 is
Fix it so that it does not move by welding or bolts.

In the above construction, each of the above-mentioned steps can be performed by the conventional construction technique, and supports the roof slab 1 while storing a compressive force on the outer portion of the roof slab 1 and a tensile force on the opening frame 5 by the cable 11. It can be held upright with the hardware 10 as a fulcrum.

[0026]

As described above, the roof structure according to the first invention has a polygonal opening at the top by combining a plurality of truss frame members formed by connecting the upper chord material and the lower chord material through the abdominal material. Constituting a roof frustum of a substantially frustum shape, the opening frame at the top of the roof slab is formed by combining a plurality of girders,
The lower part of each intersection of the girders constituting the apex of the opening frame and the supporting hardware that supports the outer part of the roof slab at a portion corresponding to the intersection are connected by a cable, and the cables are connected to each other. Tension causes a compressive force on the outer part of the roof slab,
Also, since a tensile force has been introduced in advance to the opening frame,
The compressive force acting on the opening frame is offset by the tensile force introduced in advance,
Since the tensile force acting on the outer shell of the roof slab can be offset by the compressive force introduced in advance, the force to be borne by each of the opening frame and the outer shell of the roof slab can be small. In addition, when the blowing force by the wind acts on the roof slab, the opening frame (girder) acts as a counterweight, so that the blowing force can be sufficiently dealt with. Further, since the prestress is introduced into the outer frame of the opening frame and the roof slab by the tension of the cable, the opening frame and the roof slab can have sufficient strength while reducing the size and weight of the structural members. . Therefore,
It is not necessary to build a pillar from the ground to support the roof slab as in the past, nor excessive reinforcement of the roof slab, etc.
Since it is not necessary to make the roof slab more rigid than necessary, it is possible to avoid the increase in size and weight of the roof slab. Problems such as soaring when constructing a large roof structure can be solved.

In addition, the opening frame has sufficient strength to reduce the weight, and the opening frame can be used as a member for attaching electric equipment such as lighting equipment and speakers.

Further, in the method of constructing a roof structure according to the second invention, a plurality of truss frame members formed by connecting an upper chord member and a lower chord member via a web member are combined, and a polygonal opening is formed at the top. The roof slab has a substantially frustum-shaped roof slab, and an opening frame at the top of the roof slab is formed by combining a plurality of girders. The outer shell is supported on a supporting hardware, and then the lower part of each intersection of the girders forming the vertex of the opening frame and the supporting hardware supporting the roof slab at a site corresponding to the intersection. After connecting each cable, each cable can be tensioned at the same time, so that each process can be performed with the conventional construction technology, and the cable stores compressive force in the shell of the roof slab and accumulates tensile force in the opening frame. Raising the roof slab with the supporting hardware as a fulcrum It can be. Therefore, the construction of the roof structure can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a roof structure according to the first invention.

FIG. 2 is a plan view of the roof structure.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roof slab 2 Truss frame material 3 Opening 5 Opening frame 5a Large beam 5b Vertex 10 Support hardware 11 Cable

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiyuki Kawazoe 6-2-10 Ginza, Chuo-ku, Tokyo Inside Tomoe Corporation (72) Inventor Yoshitaka Niho 6-2-10 Ginza, Chuo-ku, Tokyo Tomoe Corporation (56) References Hira 3-58507 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04B 1/32 102 E04B 1/34 E04B 7/14

Claims (3)

(57) [Claims] 1. A substantially frustum-shaped roof slab having a polygonal opening at the top is constructed by combining a plurality of truss frame members formed by connecting an upper chord material and a lower chord material via a belly material. The opening frame at the top of the plate is formed by combining a plurality of girders, and the lower part of each intersection of the girders constituting the vertex of the opening frame and the roof at a portion corresponding to the intersection. The support hardware that supports the outer part of the plate is connected to each other with a cable,
A roof structure in which a compressive force is applied to the outer shell of the roof slab and a tensile force is applied to the opening frame in advance by tensioning the cables. 2. A straight line radially drawn from a position on the ridge inside the opening and passing through each vertex of the opening frame when the roof slab is viewed in a plane intersects the outline of the roof slab. The roof structure according to claim 1, wherein the roof structure is arranged at a site. 3. A substantially frustum-shaped roof slab having a polygonal opening at the top by combining a plurality of truss frame members formed by connecting an upper chord material and a lower chord material via a web member, and After forming the opening frame at the top of the plate by combining multiple girders,
An outer portion of the roof slab is supported on a support metal at each portion corresponding to a vertex of the opening frame, and then a lower portion of each intersection of the girders forming the vertex of the opening frame; A method of constructing a roof structure, comprising connecting each of the cables to the support hardware that supports the shell of the roof slab at a site corresponding to the above, and then simultaneously tensioning the cables.