JP3281961B2 - Large space truss frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large space truss frame suitable for forming a roof covering a large space such as a dome-shaped building structure.

[0002]

2. Description of the Related Art In general, as a roof installed in a space such as a stadium, a multipurpose hall or an experimental building, a dome roof having a single-layer truss structure by combining a plurality of beams of substantially the same size is known. . The dome roof includes an iron dome using iron beams, an aluminum dome using aluminum beams, and a laminated wood (wood) dome using laminated wood (wood). The roof of the truss frame combined with such small beams has an advantage that the weight can be reduced, but the out-of-plane rigidity of the entire frame is insufficient for constructing a roof covering a large space of, for example, about 200 m in diameter.

Conventionally, in such a case, a frame method such as a parallel lamella structure has been applied. FIG.
As shown in the figure, the roof 1 to which the parallel lamella structure is applied
Are radially arched from the top 1a of the roof 1 radially arches 2, 2, ..., tension rings 3, 3, ... concentrically arranged with respect to the center 1a, and between adjacent radial arches 2, 2. The string members 4, 4,... Arranged in parallel with one radial arch 2 and the string members 5, 5,. Have been. In the roof 1 to which such a parallel lamella structure is applied, since the axial force applied to each member of the entire roof 1 is uniform, the members used for the radiation arch 2, the tension ring 3 and the chord members 4, 5 are required. It is possible to unify members with the same cross-section, and it is possible to reduce the amount of members used compared to a normal arch frame. There is.

[0004]

However, the roof 1 having the conventional structure as described above has the following problems. In the space below the roof 1, when performing an event or the like, for example, equipment for lighting, sound, etc. is installed on the roof 1.
May be suspended. In such a case, the load is concentrated on the portion where the equipment is suspended, and the local load may cause an imbalance in the axial forces applied to the members constituting the truss frame of the roof 1, which may cause a problem in strength. In addition, stress is locally concentrated even when an eccentric load such as a wind load and an earthquake load (horizontal movement, vertical movement) is applied. The present invention has been made in consideration of the above points, and an object of the present invention is to provide a large space truss frame capable of forming a roof having sufficient strength against local loads and offset loads. I do.

[0005]

The invention according to claim 1 is
A truss frame structure constituting a roof covering a large space, wherein the roof has upper and lower chord members opposed to each other, and a lattice material is laid in a truss shape between the upper and lower chord members. Are arranged at regular intervals to face each other.
Megato with a structure in which lattice material is erected in a truss shape
The laths are arranged at predetermined intervals to form the mega truss.
The string material is joined in a polygonal shape, and a beam member is laid in a truss shape inside the string material assembled in the polygonal shape.

According to a second aspect of the present invention, in the large space truss frame according to the first aspect, an in-plane where a plurality of members to be joined are located at a node where the plurality of members constituting the roof are gathered. A mounting plate having a plurality of first mounting holes formed on the same circumference, and a second mounting hole forming a pair with the mounting plate and corresponding to the first mounting hole. Bracket provided at the end of the member to be joined between the holding plate
A first mounting hole or a first mounting hole provided in a mounting surface of the bracket parallel to the mounting plate.
It is characterized in that it has a structure in which the joining pin is inserted through the hole .

[0007]

According to the first aspect of the present invention, the mega truss is maintained for a predetermined time.
The strings of the mega truss are arranged at intervals and the polygonal shape
The truss-like beam member was installed inside the chord material formed in the polygonal shape to form a roof. As a result, the upper chord material and the lower chord material are opposed to each other on the roof, and a chord material in which a lattice material is trussed between the upper chord material and the lower chord material is arranged at regular intervals so as to face each other. Lattice between materials
Mega truss having a structure in which the materials are laid in a truss shape is arranged at a predetermined interval, and the strength of the roof is greatly improved as compared with the related art.

According to the second aspect of the present invention, the plurality of first attachments are arranged on the same circumference in a plane where the plurality of members to be joined are located at the joint where the plurality of members constituting the roof are assembled. A mounting plate having a hole formed therein and a holding plate forming a pair with the mounting plate and having a second mounting hole corresponding to the first mounting hole are provided. Then, attach the bracket to the end of the member to be joined
Provided, sandwiching the bracket between the mounting plate and the pressing plate, preparative said to not the first mounting holes of the joining pin
A third provided on a mounting surface of the bracket parallel to the attachment plate;
And inserted through the mounting hole. This allows
At a node where a plurality of chords constituting the roof are gathered, a plurality of members are fixed to a mounting plate and joined.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. Here, for example, a description will be given using an example in which a dome-shaped building structure is constructed by applying a parallel lamella structure. FIG. 1 shows an example of a building A having a roof 10 to which a large space truss structure according to the present invention is applied. Building A is substantially circular in plan view,
The building A is composed of a lower body 11 made of, for example, an SRC, which is constructed on the ground and forms an outer peripheral portion of the building A, and a steel frame roof 10 provided on the lower body 11.

[0010] As shown in FIG.
A plurality of radial arches 12 extending radially from 0a, and tension rings (beam members) 13, 13, ... arranged concentrically with the top 10a are provided. And
Between adjacent radiation arches 12, 12, a beam member 14 parallel to one radiation arch 12 and a beam member 15 parallel to the other radiation arch 12 are respectively installed at equal intervals. The roof 10 has a lamella structure.

As shown in FIG. 3, the radiating arch 12 is composed of a string member 1 in which a vertical lattice member 18 is trussed between an upper chord member 16 and a lower chord member 17 made of H steel positioned vertically.
9 and 19 are opposed to each other at regular intervals.
A horizontal lattice member (lattice member) 20 is provided between the members 9 and 19 in a truss shape. Thus, the radiation arch 12 is constituted by the mega truss (truss member) M having a rectangular cross section. Of the tension ring 13 and the beam members 14 and 15, the tension ring 13a and the beam members 14a and 15a arranged at regular intervals are:
Like the radiating arch 12, it is constituted by a mega truss M having a rectangular cross section in which a horizontal lattice member 20 is provided between the chord members 19, 19.

As shown in FIG. 4, the tension ring 1
3. Of the beam members 14 and 15, the tension ring 13a and the beam members 14a and 1
Other than 5a, a vertical lattice 18 is trussed between an upper chord 16 and a lower chord 17.

In the above configuration, the chord members 19 forming the radiation arch 12, the tension ring 13a, and the beam members 14a, 15a are joined in a substantially triangular (polygonal) shape to form a frame 21.
Is configured. The roof unit 22 is configured by arranging the tension ring 13 and the beam members 14 and 15 in a truss shape in the frame 21. And
A plurality of the roof units 22 are regularly arranged on the roof 10, and the roof units 22 arranged adjacent to each other are arranged.
A lateral lattice member 20 is laid in a truss-like manner between the chord members 19, 19 between the frame members 21, and the mega truss M is configured.

The radiating arches 12, constituting the roof 10,
Each member of the tension ring 13, the beam members 14, 15
At a node where a plurality of members gather, they are joined as follows. Here, for example, the top 10 of the roof 10
This will be described using an example of the node N located at a (see FIG. 5). As shown in FIG. 6, in this node portion N, the chord members 19 and 19 of the adjacent radiation arches 12 and 12 and the small beams 2
3 and 23 are joined.

As shown in FIG. 7, the upper chord 1 of the chord 19
A bundle 24 is disposed between the lower chords (not shown). At the upper end of the bundle 24, a mounting plate 25 is provided which is a surface orthogonal to the axis of the bundle 24. In the mounting plate 25, mounting holes (first mounting holes) 26, 26,... Located on the same circumference are formed. On the other hand, a bracket 27 having a mounting surface 27a parallel to the mounting plate 25 is previously welded to each end of the upper chord material 16 and the small beam 23 of the chord material 19 to be joined. The mounting surface 27a has a mounting hole 26 formed in the mounting plate 25.
A mounting hole (third mounting hole) 28 having the same diameter as that of the mounting hole 28 is formed.

The upper chord members 16, 16 and the brackets 27 at the ends of the small beams 23, 23 are placed at predetermined positions on the upper surface of the mounting plate 25. Further, on the bracket 27, a pair with the mounting plate 25 is formed.
Mounting holes of the same diameter (second mounting holes) at positions corresponding to 6, ...
A holding plate 30 on which 29, 29,... Are formed is placed. The mounting plate 25, the upper chord member 16, the small beam 23, and the holding plate 30 are fixed by joining pins 31 inserted through the mounting holes 26, 28, 29. The lower end of the joining pin 31 is welded to the lower surface of the mounting plate 25. A cover plate 32 for protecting the joining pin 31 is attached to the upper end of the joining pin 31. The gusset plate 3 is provided below the mounting plate 25.
3 are provided, and the gusset plate 33 includes:
An end portion of a vertical lattice member 18 laid between the upper chord member 16 and the lower chord member (not shown) of the radiation arch 12 is fixed by a high tension bolt. In this way, the upper chord material 16, the small beam 2
Reference numeral 3 denotes a structure in which the bracket 27 at the end is fixed by the mounting plate 25 and the pressing plate 30 and joined.

At the lower end (not shown) of the bundle 24, similarly to the upper end, the lower chords 17, 17 and the small beams 23, 23 are sandwiched and joined by the bracket and the holding plate. .

At the nodes located on each part of the roof 10,
In the same manner as described above, the respective members such as the radiation arch 12, the tension ring 13, the beam members 14, 15, and the like are joined, and the roof 1
0 is configured.

As described above, in the roof 10 having the parallel lamella structure, the radiation arch 12 and the tension ring 13 are provided.
a, the string member 1 in which the beam members 14a and 15a are arranged to face each other.
It is constituted by a mega truss M in which a horizontal lattice member 20 is laid in a truss-like manner between 9 and 19. Thereby, roof 1
At 0, the configuration is such that the mega trusses M are arranged at predetermined intervals, and the strength of the roof 10 is greatly improved as compared with the conventional case.
Therefore, for example, even when an apparatus or the like is suspended from the roof 10 at the time of an event or the like, the local load applied to the roof 10 via the mega truss M can be dispersed, and it is possible to sufficiently cope with the suspension. In addition, horizontal motion such as wind and earthquake,
Concentration of stress can be prevented even with an unbalanced load due to vertical movement or the like. Also, compared to the conventional structure, only the amount of steel frames used in the part of the mega truss M increases, and the increase in the amount of steel frames used in the roof 10 as a whole is small. Therefore, the roof 10 can be configured without significantly increasing the cost. In addition, Megatruss M
Are regularly arranged to form a geometric pattern, so that the appearance can be used as a design accent.

Further, at the nodes N of the members constituting the roof 10, mounting plates 25 are provided at the upper and lower ends of the bundle 24,
The mounting plate 25 and the holding plate 30 form the beam members 14 and 1.
5. Brackets 27 provided at the ends of the members such as the upper chord member 16 and the lower chord member 17 are sandwiched, and the mounting holes 26, 28, 2
Each member is joined by inserting a joining pin 31 into 9.
When constructing the roof 10, at the construction site, it is only necessary to use the joining pins 31 to join the members at the nodes, and the joining operation can be easily performed.

In the above embodiment, the roof 10 is
An example in which a parallel lamella structure in which a radiating arch 12, a tension ring 13a, and beam members 14a and 15a formed of a mega truss M intersect and form a substantially triangular shape is used is used, but is not limited thereto. Instead, even when other structures having a polygonal shape such as a quadrangle or a hexagon are applied to the roof, the roof is provided with a mega truss, that is, a lattice material is placed between the opposed upper and lower chord materials. If the truss members installed in a truss shape are assembled in a polygonal shape, the same effects as described above can be obtained.

[0022]

As described above, according to the large space truss frame according to the first aspect, mega trusses are arranged at predetermined intervals.
The string material that constitutes the mega truss is formed in a polygonal shape
Then , a beam member was erected in the shape of a truss inside the chord material formed in the polygonal shape to form a roof. Strings Thus, the roof, where the upper chord member and the lower chord member are laid lattice material truss-like between and these upper chord member being oppositely arranged respectively lower chord member
Materials are arranged at regular intervals, and lattice material is
The mega truss having a truss-like configuration is arranged at predetermined intervals, and the strength of the roof is greatly improved as compared with the related art. Therefore, for example, at the time of an event or the like, it is possible to disperse the local weight applied to the roof via the mega truss even when suspending equipment and the like on the roof,
It is possible to respond sufficiently. In addition, concentration of stress can be prevented even with an eccentric load due to horizontal movement or vertical movement such as wind or earthquake. In comparison with the conventional structure, main
Only the amount of steel frame used in the gatras portion increases, and the increase in the amount of steel frame used for the roof as a whole is small. Therefore, a truss frame that covers a large space can be configured without causing a significant increase in cost. In addition, eye roof
Since the gatras are regularly arranged to form a geometric pattern, the appearance can be used as a design accent.

According to the large space truss frame according to the second aspect, the bracket provided at the end of each member is sandwiched between the mounting plate and the holding plate at the node of each member constituting the roof, and the mounting hole is provided. Each member is joined by inserting a joining pin into the member. Since the members are joined at the joints when the roof is constructed, it is only necessary to use the joining pins at the construction site, and the joining operation can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a building structure to which a large space truss frame according to the present invention is applied.

FIG. 2 is a plan view showing a roof portion of the building structure.

FIG. 3 is a perspective view showing a truss member constituting the roof portion.

FIG. 4 is a perspective view showing a beam member constituting the roof portion.

FIG. 5 is a schematic plan view showing a joining structure of members in the roof portion.

FIG. 6 is a plan view showing a joint structure of each member at a node of the roof.

FIG. 7 is a side sectional view showing the joint structure.

FIG. 8 is a plan view showing a conventional roof truss frame structure.

[Explanation of symbols]

 Reference Signs List 13 tension ring (beam member) 14, 15 beam member 16 upper chord material 17 lower chord material 20 lateral lattice (lattice material) 21 frame 25 mounting plate 26 mounting hole (first mounting hole) 27 bracket 28 mounting hole (third hole) Mounting hole) 29 Mounting hole (second mounting hole) 30 Holding plate 31 Joint pin M Mega truss (truss member)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takayuki Nishitani 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (56) References JP-A-61-225441 (JP, A) JP-A Sho 56−46048 (JP, A) Fully open sho 64-7602 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/32 102 E04B 1/19 E04B 1/342 E04C 3 / 08 E04B 7/08

Claims (2)

(57) [Claims] 1. A truss frame constituting a roof covering a large space, wherein an upper chord material and a lower chord material are opposed to each other on the roof, and a lattice material is trussed between the upper chord material and the lower chord material. chords having the structure which is bridged Jo are opposed at regular intervals, these
A truss-like structure in which lattice material is laid between strings
Gatorasu is disposed at a predetermined interval, the chords constituting the Megatorasu is joined in a polygonal shape, the beam member is formed by bridging truss shape inwardly of chords that are assembled in a multi-angle shape A large space truss frame characterized by the following. 2. The truss frame of a large space according to claim 1, wherein a plurality of members to be joined are disposed in a plane where a plurality of members to be joined are located at a node where the plurality of members constituting the roof gather. A mounting plate having a plurality of first mounting holes formed on the same circumference; and a holding plate forming a pair with the mounting plate and having a second mounting hole corresponding to the first mounting hole. A bracket provided at an end of a member to be joined is sandwiched therebetween, and a third mounting hole or the first mounting hole provided on a mounting surface of the bracket parallel to the mounting plate. A large space truss frame characterized by a structure in which a connecting pin is inserted through.