JP2005002604A - Chord tensioning truss structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the flexibility of design and diversity in design of a chord tensioning truss structure. <P>SOLUTION: A post material is arranged inside a frame body of connecting three grid materials in a triangular frame shape; with a grid unit 1 formed by tensioning six cables between both ends of the post material and the respective apexes of the frame body, as constituting unit, the mutual apexes of the frame body of the respective grid units are mutually connected; a grind frame 13 is constituted with a void formed in these frame bodies and between the respective frame bodies as a box; and chord members 12a, 12b, 14a and 14b are tensioned between the mutual post materials of the adjacent grid units. A hinge 15 for collapsibly connecting the grid frame, is arranged at a connection point of the mutual grid units. The cables are connected to a connecting member installed in the post materials, and prescribed tension is applied to the cables, by fixing the connecting member to an end part of the post materials. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stringed truss structure suitable for application to, for example, a roof structure of a large-scale structure.
[0002]
[Prior art]
As a structure suitable for a roof structure of a large-scale structure or the like, there is a string truss structure by a combination of a frame and a cable, and an example thereof is a tense grid structure as shown in Patent Document 1. There is something.
[0003]
This is a grid unit (tensegrity) in which a bundle material is arranged inside a frame body formed by assembling steel pipes in a rectangular frame shape, and a cable is stretched between both ends of the bundle material and each vertex of the frame. ) Are connected to each other and the vertices of the frame bodies of the grid units are connected to each other to form a grid frame having a grid formed between the frame bodies and a gap formed between the frame bodies, and a bundle of adjacent grid units. It has a structure in which materials are connected by a tensile material to give tension.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-54492
[Problems to be solved by the invention]
The conventional string truss structure with the above tensegrity is light enough for the entire frame, and can be easily and easily controlled for stress and deformation. It has excellent characteristics such as being able to form a curved surface, but the shape of the frame body in tensegrity, which is its structural unit, is limited to rectangular (especially square), so design freedom and design Diversity is not always sufficient, and an improvement plan in that respect has been desired.
[0006]
[Means for Solving the Problems]
In view of the above circumstances, the stringed truss structure according to the first aspect of the present invention has a bundle member arranged inside a frame body in which three grid members are connected in a triangular frame shape, and both ends of the bundle member and each of the frame bodies are arranged. A grid unit formed by stretching 6 cables between the vertices is used as a structural unit, and the vertices of the frame bodies of each grid unit are connected to each other to form the frame bodies and each frame body. A grid frame having a grid as a grid is formed, and a chord member is stretched between bundle members of adjacent grid units.
[0007]
According to a second aspect of the present invention, in the stringed truss structure according to the first aspect of the present invention, a hinge is provided at a connection point between the grid units so that the grid frame can be folded.
[0008]
According to a third aspect of the invention, in the stringed truss structure according to the first or second aspect of the invention, one end of the cable is fixed to the apex of the frame body, the other end of the cable is connected to the connecting member, and the connecting member is bundled. The cable length was set so that a predetermined tension was applied to the cable with the connecting member fixed to the end of the bundle with the connecting member fixed to the end of the bundle. It is characterized by.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram showing a part of a stringed truss structure body (hereinafter simply referred to as a structure body) according to the present embodiment, FIGS. 2 to 3 are diagrams showing a grid unit as a structural unit, and FIG. It is a figure which shows the folding state of this whole structure.
[0010]
First, the grid unit 1 will be described with reference to FIG. This is because a bundle member 4 is arranged inside a frame body 3 in which three grid members 2 are connected in a triangular frame shape, and three pieces are provided between upper and lower ends of the bundle member 4 and each vertex of the frame body 3. A total of six cables 5 are stretched one by one. A small-diameter steel pipe or a CFRP pipe can be suitably used as the grid material 2 and the bundle material 4, and a PC steel wire or a CFRP cable can be suitably adopted as the cable 5.
[0011]
Note that both ends of the cable 5 may be directly fixed to the apex of the frame body 3 and the end of the bundle member 4, respectively, and tension may be introduced to the cable 5 as appropriate, for example, as shown in FIG. It is conceivable to configure as follows. In the embodiment shown in FIG. 3, one end of the cable 5 is directly fixed to the apex of the frame body 3, but the other end of the cable 5 is connected to an annular connecting member 6, and the connecting member 6 is connected to a bundle member. 4 is mounted so that it can be displaced in the axial direction of 4 and can be fixed to the end of the bundle 4. Then, the length of the cable 5 is set strictly in advance so that a predetermined tension is applied to the cable 5 in a state where the connecting member 6 is fixed to the end of the bundle member 4 as shown in FIG. In addition, the cable 5 can be naturally loosened by displacing the connecting member 6 inward as shown in FIG.
[0012]
As shown in FIG. 1, in this embodiment, a unit frame 11 is configured by two grid units 1, and a large number of these unit frames 11 are connected in the horizontal direction to configure the entire structure.
[0013]
That is, the two grid units 1 are opposed to each other and the vertices of the frame bodies 3 are connected to each other, and the string members 12a and 12b are respectively connected between the upper ends and the lower ends of the bundle members 4 of the grid units 1 and 2 respectively. By stretching, a unit frame 11 having a shape in which both grid members 2 intersect in an X shape is configured.
[0014]
Then, by connecting a large number of these unit frames 11 in the horizontal direction, a grid frame 13 is formed by triangular grids formed by the frame bodies 3 and rhombus grids formed between them, and The string members 14a and 14b are stretched between the upper ends and the lower ends of the bundle members 4 in the adjacent unit frames 11 to form the structure of the present embodiment. As the chord members 12a, 12b, 14a, and 14b, PC steel wires and CFRP cables can be suitably employed in the same manner as the cable 5 described above. The string members 12a, 12b, 14a, and 14b may be directly connected to the ends of the bundle member 4. However, when the connecting member 6 is used, the string members 12a and 12b are connected to the connecting member 6. , 14a, 14b may be connected.
[0015]
The unit frames 11 are connected by connecting the vertices of the frame bodies 3 of the grid units 1. In this embodiment, a hinge 15 is provided at the connection point to connect the cable 5 and the chord material. In the state where 12a, 12b, 14a and 14b are loosened, the grid frame 13 can be folded in a zigzag shape by the hinge 15 as shown in FIG. It is said that. In addition, the chain line shown in FIG. 1 and FIG. 4 is a folding position, and illustration of a cable and a chord material is abbreviate | omitted in FIG.4 (b).
[0016]
The above structure is a sufficiently lightweight structure, similar to a conventional tensegrity structure as shown in Patent Document 1, and stress control and deformation control can be easily and easily performed. Since it is a self-balancing frame, it has an excellent characteristic that a curved surface of an arbitrary shape can be formed, and as a grid unit 1 as its constituent unit, a triangular shape is used instead of a conventional general rectangular frame body. As a result of adopting the frame body 3, the number of members can be reduced as compared with the case where the conventional tensegrity is used as a structural unit, so that further weight saving and simplification of construction can be achieved. The degree of design freedom of the structure can be increased, and various structures with various designs can be realized.
[0017]
In the above embodiment, the grid frame 13 having the triangle and rhombus meshes is configured by connecting the unit frames 11 in which the two grid units 1 are combined in the horizontal direction. The form of the entire grid frame 13 formed thereby is arbitrary, and may be appropriately designed according to the form and scale of the structure to be constructed. Of course, this structure is not limited to the use as a roof of a structure, but can be applied to various uses such as a space-related structure.
[0018]
Further, in the above embodiment, since the entire grid frame 13 can be folded by connecting the unit frames 11 with each other via the hinge 15, for example, this structure is manufactured in a factory and transported to the site. Then, the construction can be easily performed by deploying on the site, and for example, when applied to a temporary structure, there is an advantage that the installation, removal, and relocation can be easily performed. However, the structure of the present invention is not limited to the unfolded type, and the grid units 1 may be simply fixedly connected if it is not necessary to be folded when applied to a fixed structure.
[0019]
Furthermore, in the above-described embodiment, the cable 5 set to an appropriate length in advance is connected to the connecting member 6, and the connecting member 6 is displaced in the axial direction of the bundle 4 and fixed to the end. Since the tension is introduced to the cable 5, the tension can be easily introduced into the cable 5 and the cable 5 can be easily loosened. A configuration for connecting and fixing the cable 5 to the bundle 4 and a configuration for applying tension to the cable 5 are arbitrary.
[0020]
【The invention's effect】
The stringed truss structure of the invention of claim 1 has a triangular frame shape in the grid unit that is the structural unit, so the number of members can be reduced compared to the case where the conventional tensegrity is the structural unit, Therefore, it is possible to further reduce the weight and simplify the construction, increase the design freedom of this type of structure, and realize various stringed truss structures with various designs. Can do.
[0021]
In the invention of claim 2, since the grid units are foldably connected by hinges, the entire structure can be folded small and easily expanded, and thus assembled and expanded in a folded state. Thus, the construction can be easily performed, and when applied to a temporary structure, for example, the installation, removal and relocation can be easily performed.
[0022]
In the invention of claim 3, since the cable is connected to the connecting member attached to the bundle member, it is easy to introduce the tension into the cable by displacing the connecting member in the axial direction of the bundle member and fixing it to the end. In addition, the cable can be easily loosened, and is suitable for application to a deployable tension string truss structure.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a stringed truss structure that is an embodiment of the present invention.
FIG. 2 is a perspective view showing a grid unit that is a structural unit of the same.
FIG. 3 is a diagram for explaining an example of a cable stretching method.
FIG. 4 is a diagram for explaining a folded state of the entire structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Grid unit 2 Grid material 3 Frame body 4 Bundling material 5 Cable 6 Connecting member 11 Unit frame 12a, 12b String material 13 Grid frame 14a, 14b String material 15 Hinge

Claims (3)

A bundle member is formed inside a frame body in which three grid members are connected in a triangular frame shape, and six cables are stretched between both ends of the bundle member and each vertex of the frame member. By configuring the grid units as structural units and connecting the vertices of the frame bodies of each grid unit to each other, a grid frame is formed with a grid formed between the frame bodies and the gaps formed between the frame bodies, and adjacent grids. A stringed truss structure characterized in that string members are stretched between the bundles of the unit. 2. The stringed truss structure according to claim 1, wherein a hinge is provided at a connection point between the grid units so that the grid frame can be folded. One end of the cable is fixed to the apex of the frame body, the other end of the cable is connected to the connecting member, and the connecting member is mounted so as to be displaceable in the axial direction of the bundle and fixed to the end of the bundle. 3. The stringed truss structure according to claim 1 or 2, wherein the cable length is set so that a predetermined tension is applied to the cable in a state where the cable is fixed to the end of the bundle.

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