JPH06288009A - Construction of large space truss - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object of the present invention to provide a construction method for a large space truss that is highly safe, reduces temporary construction costs, and shortens the construction period. [Structure] The roof 10 is divided into three parts in the radial direction, the center part B is first grounded, then the middle part C located on the outer periphery of the center part B is grounded, and the center part B is raised to form the middle part. Join with C. Next, the outer peripheral portion D located on the outer periphery of the intermediate portion C is grounded, and the joined central portion B and intermediate portion C are elevated and joined. Then, the central portion B, the intermediate portion C, and the outer peripheral portion D, which are joined together, are lifted up and installed on the lower skeleton body 2 to construct the roof 10.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, as a roof erected in a space such as a stadium, a multipurpose hall, or an experimental building, a single-layer truss frame or upper chord member, lower chord member, and A dome roof with a multi-layer truss frame made of lattice material is known. Conventionally, as a method of constructing a dome roof of this type, a plurality of supports and scaffolds are temporarily installed inside the lower structure inside the dome roof, and a plurality of beam beams are lifted by a crane or the like. A construction method is used in which the entire dome roof is erected by erection between the corresponding support works and joining these beamlets in a truss shape.

[0003]

However, the conventional roof construction method as described above has the following problems. In order to construct this dome roof, a large amount of support work and scaffolding must be temporarily installed, and the worker must join the small beams at a high place on the scaffolding. It is costly and time consuming, and there is also a problem in terms of safety for workers, and there is a problem that a huge number of beams must be managed. The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for constructing a large space truss that is excellent in safety, reduces temporary construction costs, and shortens the construction period.

[0004]

The invention according to claim 1 is
A method of constructing a truss for constructing a roof covering a large space, wherein the roof is composed of a plurality of divided bodies having the same center divided in the radial direction, and the outer divided bodies are assembled. After grounding at the outer peripheral portion of the inner divided body, the step of raising the inner divided body, and joining the outer peripheral portion of the inner divided body and the inner peripheral portion of the outer divided body, It is characterized in that the roof is assembled by repeating the roof from the center to the outer periphery, and then the assembled roof is integrally raised and installed at a position where it should be installed.

According to a second aspect of the present invention, in the method for constructing a large space truss according to the first aspect, a plurality of beam members are provided in each of the divided bodies in a polygonal frame body having an upper chord member and a lower chord member. Arrange a plurality of roof units arranged in a shape,
In addition to constructing a lattice member in a truss shape between the frame bodies facing each other between adjacent roof units, when joining the inner divided body and the outer divided body,
It is characterized in that a lattice member is installed in a truss shape between the outer peripheral portion of the inner divided body and the inner peripheral portion of the outer divided body.

[0006]

According to the first aspect of the present invention, after the outer divided body located on the outer peripheral portion of the inner divided body that has been assembled is set up, the inner divided body is lifted and the outer peripheral portion The process of joining the inner peripheral portion of the divided body is sequentially performed from the central portion of the roof toward the outer peripheral portion to construct the roof to be constructed. That is, for example, when the roof to be constructed is composed of three divided bodies in the radial direction, first the first divided body located in the center of the roof is grounded and then located on the outer periphery of the first divided body. The ring-shaped second divided body is grounded. And
The first divided body is raised to join the outer peripheral portion and the inner peripheral portion of the annular second divided body. Next, the annular third divided body located further on the outer periphery of the joined first and second divided bodies is assembled. Then, the joined first and second divided bodies are raised to join the outer peripheral portion and the inner peripheral portion of the annular third divided body. A roof covering a large space is constructed by elevating and installing the roof thus assembled to a predetermined height. At this time, work other than joining the divided bodies is ground work on the ground, and work at high places is significantly reduced.

According to the second aspect of the present invention, since a plurality of roof units assembled in advance in a polygonal shape are arranged to form each divided body to construct a roof, the roof assembly work at the construction site is significantly reduced. To be done. Furthermore, between the frames of the adjacent roof units, the lattice members are erected in a truss shape between the frames facing each other, so that a truss beam with a rectangular cross-section is formed here, and this truss beam is formed on the entire roof at predetermined intervals. As a result, a strong roof is constructed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. Here, for example, an example in which a parallel lamella structure is applied to construct a dome-shaped building structure that is substantially circular in a plan view will be described. FIG. 3 shows an example of a building A having a roof 1 to be constructed by applying the large space truss construction method according to the present invention. The building A has a substantially circular shape in a plan view, and is constructed on the ground to form the outer peripheral portion of the building A, for example, a lower frame 2 made of SRC,
It is composed of a steel-framed roof 1 provided on the lower frame 2.

As shown in FIG. 4, the roof 1 has a top portion 1a.
A plurality of radial arches 3 extending radially from the tension rings 4, 4 arranged concentrically with respect to the top 1a.
... is provided. And the adjacent radiation arch 3,
A beam member 5 parallel to one radiating arch 3 and a beam member 6 parallel to the other radiating arch 3 are provided at equal intervals between the three, whereby a roof 1 having a so-called parallel lamella structure is provided. It is configured.

As shown in FIG. 5, the radiating arch 3 is a chord member 10 or 10 in which a vertical lattice member 9 is erected in a truss shape between an upper chord member 7 and a lower chord member 8 made of H steel located above and below.
However, they are arranged so as to face each other at a constant interval, and a lateral lattice material (lattice material) 11 is installed in a truss shape between the chord members 10, 10. As a result, the radiating arch 3 is composed of the mega truss M having a rectangular cross section. Of the tension ring 4 and the beam members 5 and 6, the tension rings 4a and the beam members 5a and 6a arranged at regular intervals have the horizontal lattice member 11 between the chord members 10 and 10 like the radial arch 3. The mega truss M is installed and has a rectangular cross section.

As shown in FIG. 6, the tension ring 4,
Of the beam members 5 and 6, except for the tension ring 4a and the beam members 5a and 6a made of the mega truss M, a vertical lattice member 9 is erected in a truss shape between the upper chord member 7 and the lower chord member 8. Has become.

In the above structure, the chord member 10 constituting the radial arch 3, the tension ring 4a and the beam members 5a and 6a.
Thus, the frame body 12 joined in a substantially triangular shape (polygonal shape) is configured. The tension ring 4, the beam members 5 and 6 are arranged in a truss shape in the frame body 12 to form a roof unit 13. A plurality of roof units 13 are regularly arranged on the roof 1, and the lateral lattice members 11 are provided between the frame members 12 of the roof units 13 arranged adjacent to each other and between the chord members 10 arranged opposite to each other. Is erected in a truss shape to form a mega truss M.

The radiating arch 3, the tension ring 4, the beam members 5 and 6 constituting the roof 1 are joined as follows at a node portion where a plurality of members gather. Here, for example, the node N located on the top 1a of the roof 1 will be described as an example (see FIG. 7). As shown in FIG. 8, in each node N, the adjacent radiating arches 3, 3 are
The chord members 10 and 10 and the cross beams 14 and 14 are joined.

As shown in FIG. 9, at this node N,
A bundle member 15 is arranged between the upper chord member 7 and the lower chord member (not shown) of the chord member 10. At the upper end of this bundle 15,
A mounting plate 16 formed of a surface orthogonal to the axis of the bundle 15 is provided. The mounting plate 16 is formed with mounting holes 17, 17, ... Located on the same circumference. On the other hand, a bracket 18 having a mounting surface 18a parallel to the mounting plate 16 is pre-welded and attached to each end of the upper chord member 7 and the beam 14 of the chord member 10 to be joined.
A mounting hole 19 having the same diameter as the mounting hole 17 formed in the mounting plate 16 is formed in the mounting surface 18a.

The upper chord members 7, 7 and the brackets 18 at the ends of the beam members 14, 14 are mounted at predetermined positions on the upper surface of the mounting plate 16. Furthermore, this bracket 18
On the upper side, a pair is formed with the mounting plate 16, and mounting holes 17, 17, ...
A pressing plate 21 having mounting holes 20, 20, ... Of the same diameter is placed at a position corresponding to. These mounting plates 1
6, the upper chord member 7, the beam 14, and the pressing plate 21 are joint pins 22 inserted through the mounting holes 17, 19 and 20.
It is fixed by. The lower end of the joining pin 22 is
It is welded to the lower surface of the mounting plate 16. Also, the joining pin 2
A cover plate 23 for protecting the joint pin 22 is attached to the upper end portion of 2. The mounting plate 16
A gusset plate 24 is provided below the gusset plate 24.
The end portion of the vertical lattice member 9 provided between the lower chord member 8 and the lower chord member 8 is fixed by a high tension bolt. In this way, the upper chord member 7 and the beam 14 are attached to the mounting plate 1 by mounting the bracket 18 at the end thereof.
6 and the pressing plate 21 are fixed and joined together.

At the lower end (not shown) of the bundle member 15, the lower chord members 8 and 8 and the beam members 14 and 14 are sandwiched and joined by the bracket and the pressing plate in the same manner as the upper end portion. .

At the nodes located at various parts of the roof 1, the radial arch 3, the tension ring 4, and the like in the same manner as above.
Each member such as the beam members 5 and 6 is joined to form the roof 1.

Next, a method for constructing the roof 1 having the above structure will be described with reference to FIGS. 1 to 9. First, in the factory, the tension ring 4, the beam members 5, 6 are preliminarily set in the frame body 12 in which the radiating arch 3, the tension ring 4a, and the chord members 10 constituting the beam members 5a, 6a are joined in a substantially triangular shape (polygonal shape). The roof unit 13 having the trusses arranged therein is manufactured.

At the construction site, the roof 1 to be constructed is assembled on the floor 25 on the inner side of the already constructed lower body 2. At the time of this assembly, the following steps are performed.
The roof 1 having a substantially circular shape in a plan view is radially arranged on the center portion (inner division body) B of the roof 1, an annular middle portion (outer division body) C located on the outer periphery of the center portion B, and the outermost periphery. The ring-shaped outer peripheral portion (outer divided body) D is divided into three parts and assembled.

First, as shown in FIG. 1, eight roof units 13 are arranged at predetermined positions on a floor 25 by a crane 26 or the like. And adjacent roof units 1
As shown in FIG. 5, between the frames 3 and 13, the frame body 1 facing each other.
A lateral lattice member 11 is installed in a truss shape between the chord members 10 and 10 of 2 and 12, and the central portion B is assembled. At this time, the mega truss M is formed between the adjacent roof units 13 and 13 (FIG. 4).

Next, as shown in FIG. 2, temporary pedestals 27 are erected on the floor 25 near the outer peripheral edge of the central portion B at positions intersecting with the radial arches 3, 3 ,. And
Similarly to the central portion B, a predetermined number of roof units 13 are arranged, the roof units 13 are connected to each other, and the intermediate portion C is assembled. Thereby, like the central portion B,
A mega truss M is formed between the adjacent roof units 13 and 13 (Fig. 4). Next, the central portion B is hoisted by a plurality of cranes 26, and the heights of the outer peripheral edge portion of the central portion B and the inner peripheral edge portion of the intermediate portion C located on the outer peripheral portion thereof are matched. At this time, the tension ring 4 annularly arranged on the outer peripheral portion of the central portion B receives the axial force of each member assembled inward of the tension ring 4. Then, the chord member 10 of the frame body 12 at the outer peripheral edge of the central portion B
Then, the lateral lattice member 11 is erected in a truss shape between the chord member 10 of the frame body 12 at the inner peripheral edge of the intermediate portion C, and the central portion B and the intermediate portion C are joined. As a result, the mega truss M having an annular shape in plan view is formed between the central portion B and the intermediate portion C.

Next, the joined central portion B and intermediate portion C are formed as an inner divided body, and temporary construction pedestals 27 are respectively provided at positions near the outer peripheral edge portion and intersecting the radial arches 3, 3, ....
To stand. Then, similarly to the central portion B and the intermediate portion C, a predetermined number of roof units 13 are arranged and joined to assemble the outer peripheral portion (outer divided body) D. Then, the joined central portion B and intermediate portion C are integrally raised by the crane 26 along the temporary gantry 27, and the outer peripheral edge portion of the intermediate portion C and the inner peripheral edge portion of the outer peripheral portion D are trussed. It is joined by the horizontal lattice material 11 installed on the. As a result, a mega truss M having an annular shape in plan view is formed between the intermediate portion C and the outer peripheral portion D. As a result, the radiation ring 12a, the tension ring 4a, and the beam members 5a and 6a of the roof 10 are made up of the mega truss M.

In this way, the central portion B, the intermediate portion C, and the outer peripheral portion D are joined, and the roof 10 is assembled on the ground. Then, the assembled roof 10 is lifted by the crane 26 along the lower skeleton 2 located on the outer peripheral side,
It is joined to the upper end of the lower layer frame 2. After this, a roof plate (not shown) is arranged on the roof 10 thus constructed, and the construction of the building A to be constructed is completed.

In the method of constructing the roof 10 described above, the roof 1
0 is divided into 3 in the radial direction, the central portion (inner divided body) B is first grounded, and the middle portion (outer divided body) C is grounded at the outer peripheral portion of this central portion B, and then the center The part B was raised and joined to the intermediate part C. Next, the joined central portion B and intermediate portion C are formed as an inner divided body, and the outer peripheral portion (outer divided body) D is ground at this outer peripheral portion, and the joined central portion B and intermediate portion C are raised. Let me join this. Then, the central portion B, the intermediate portion C, and the outer peripheral portion D, which are joined together, are integrally lifted and installed on the lower skeleton body 2 to construct the roof 10. As a result, work other than joining the central portion B, the intermediate portion C, and the outer peripheral portion D is ground work on the ground, so work in high places is greatly reduced, and work safety is greatly improved. be able to. Further, since the number of temporary gantry 27 to be used can be significantly reduced, it is possible to shorten the construction period and significantly reduce the cost. Further, since the roof 10 is configured by disposing a plurality of roof units 13 assembled in a substantially triangular shape in advance, it becomes easy to manage the members on the construction site and the assembly work on the construction site is significantly reduced. Therefore, the construction period can be shortened and the construction cost can be reduced. Further, since the horizontal lattice member 11 is installed in a truss shape between the chord members 10 and 10 facing each other between the frame bodies 12 and 12 of the adjacent roof units 13 and 13, the radiation arch 3 and the tension ring 4 of the roof 10 are provided.
a and the beam members 5a and 6a are configured by a mega truss M which is a truss beam having a rectangular cross section, and a roof having high strength is constructed.

In the above embodiment, the roof 10 is circular in plan view and is formed by applying the parallel lamella structure.
However, the structure is not limited to this. Even when other structures in which each roof unit is, for example, a quadrangle or a hexagon is applied, the roof is divided in the radial direction and the roof is assembled outward from the center in the same manner as described above. If so, it is possible to obtain the same effect.

[0026]

As described above, according to the method of constructing a large space truss according to the first aspect of the invention, the annular outer divided body is grounded at the outer peripheral portion of the assembled inner divided body. After that, the process of raising the inner divided body and joining the outer peripheral portion and the inner peripheral portion of the outer divided body to the roof from the central portion to the outer peripheral portion should be repeated in sequence and constructed. Build a roof. At this time, since the work other than joining the divided bodies is ground work on the ground, work at high places can be significantly reduced and work safety can be greatly improved. Further, since the number of temporary gantry used can be significantly reduced, it is possible to shorten the construction period and significantly reduce the cost.

According to the large space truss construction method of the second aspect, the roof is constructed by disposing a plurality of roof units assembled in advance in a polygonal shape to configure each divided body.
Assembly work at the construction site is significantly reduced, which can shorten the construction period and construction cost. Furthermore, between the frames of the adjacent roof units, the lattice members are erected in a truss shape between the frames facing each other, so that a truss beam with a rectangular cross-section is formed here, and this truss beam is formed on the entire roof at predetermined intervals. As a result, the roof having high strength can be constructed.

[Brief description of drawings]

FIG. 1 is a schematic view showing a building structure being constructed by applying a method for constructing a large space truss according to the present invention.

FIG. 2 is a schematic view showing a process of constructing a roof of a building structure by applying the same construction method.

FIG. 3 is a perspective view showing an example of a building structure to be constructed by applying the construction method.

FIG. 4 is a plan view showing a roof portion of the building structure.

FIG. 5 is a perspective view showing a truss member that constitutes the roof portion.

FIG. 6 is a perspective view showing a beam member that constitutes the roof portion.

FIG. 7 is a schematic plan view showing a joint structure of members in the roof portion.

FIG. 8 is a plan view showing a joint structure of each member in the roof portion.

FIG. 9 is a side sectional view showing the same joint structure.

[Explanation of symbols]

 1 Roof 7 Upper chord material 8 Lower chord material 11 Lateral lattice material (Lattice material) 12 Frame body B Center part (inner divided body) C Middle part (outer divided body) D Outer peripheral part (outer divided body)

Front page continuation (72) Inventor Takayuki Nishitani 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation

Claims (2)

[Claims] 1. A method of constructing a truss for constructing a roof covering a large space, comprising a plurality of divided bodies having the same center and formed by dividing the roof in a radial direction thereof, and an outer divided body. After grounding at the outer peripheral portion of the inner divided body that has been assembled, raise the inner divided body,
The roof is assembled by sequentially repeating the step of joining the outer peripheral portion of the inner divided body and the inner peripheral portion of the outer divided body from the central portion of the roof toward the outer peripheral portion, and thereafter, the assembled roof A method for constructing a large space truss, characterized in that the truss is raised as a unit and installed at the position where it should be installed. 2. The method for constructing a large space truss according to claim 1, wherein each of the divided bodies has a plurality of beam members arranged in a truss shape in a polygonal frame body having an upper chord member and a lower chord member. A plurality of roof units are arranged, and a lattice member is installed in a truss shape between the frame bodies facing each other between adjacent roof units, and the inner divided body and the outer divided body are joined together. At this time, a construction method of a large space truss, wherein a lattice member is installed in a truss shape and joined between an outer peripheral portion of the one divided body and an inner peripheral portion of the other divided body.