JP2004232291A - Expansion stretched chord truss structural body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize an expansion stretched chord truss structural body capable of being more simply constructed, removed and moved on the basis of a tensegrity structure. <P>SOLUTION: A bendable strut material 5 by a hinge section 4 is placed to the inside of a pantographically deformable frame body 3, a cable 6 is stretched between both ends of the strut material and each summit of the frame body to form a development grid unit 1 as a constitution unit, the summits of the frame body of each grid unit are connected to each other to form a grid frame 8, and a chord member 7 is stretched between strut materials of the grid units adjacent to each other. In a state to develop the grid frame, both lengths of each cable and each chord member are so set that predetermined tensile force can be naturally introduced into each of them. The hinge section of the strut material is connected to the fame body with a connecting material 10, and the strut material is pushed and pulled to make it bend through the connecting material with the deformation of the frame body. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a deployable string truss structure suitable for application to, for example, a roof frame of a large-scale structure.
[0002]
[Prior art]
As a structure suitable for being applied to a roof frame of a large-scale structure, there is a string truss structure formed by a combination of a frame and a cable, and as an example, a so-called tense grid structure as shown in Patent Document 1 There is.
[0003]
This is a grid unit (Tensegrity) in which a bundle is arranged inside a frame body composed of compressed materials in a frame shape, and cables are stretched between both ends of the bundle and each vertex of the frame body. ) As a structural unit, and connecting the vertices of the frame bodies of the grid units to each other to form a grid body having a space formed between the frame bodies and the frame body as a grid, and a bundle of adjacent grid units. It has a structure in which tension is applied by connecting two members with a tension member. The entire frame can be made sufficiently lightweight, stress control and deformation control can be performed easily and easily, and it is a self-balancing type frame. Therefore, it has an excellent characteristic that a curved surface of an arbitrary shape can be freely configured.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-54492
[Problems to be solved by the invention]
By the way, the construction of the above-mentioned tense grid structure is not particularly difficult, but when considering that this tense grid structure is applied to a temporary structure or to a structure provided in outer space, for example, It is desirable to be able to construct more easily and to be able to easily remove and move as needed, and a more effective structure that enables this is being sought.
[0006]
In view of the above-mentioned circumstances, an object of the present invention is to provide a deployable string truss structure that can be more easily constructed and can be removed and moved based on a conventional tense grid structure.
[0007]
[Means for Solving the Problems]
In the deployable string truss structure according to the first aspect of the present invention, a hinge portion is provided at an intermediate portion inside a frame body in which four grid members are connected in a rectangular frame shape in a pantograph-like deformable state. An expandable grid unit formed by disposing a bendable bundle material and stretching eight cables between both ends of the bundle material and each vertex of the frame body as a constituent unit, and a frame of each grid unit. The apex of the body is connected to each other to form an expandable grid frame, and a chord is stretched between bundles of adjacent grid units.
[0008]
According to a second aspect of the present invention, in the deployable string truss structure according to the first aspect of the present invention, each cable and each string are so arranged that predetermined tension is naturally introduced to each cable and each string member in a state where the grid frame is expanded. The length of the material is set.
[0009]
According to a third aspect of the present invention, in the deployable string truss structure according to the first or second aspect of the present invention, the hinge portion of the bundle material in each grid unit and the frame body are connected by a connecting material. The present invention is characterized in that the bundle material is configured to be pushed and pulled to bend via the connecting material.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an overall schematic configuration of an expandable string truss structure (hereinafter, simply abbreviated as a structure) of the present embodiment. FIG. 2 is a diagram showing an expandable grid unit 1 as a structural unit thereof. 3 is a plan view of the entire structure, FIG. 4 (a) is a partially enlarged plan view, FIG. 4 (b) is a side view thereof, and FIGS. FIG. 3, 4 (a) and 5, the illustration of the chord material 7 is omitted, and FIG. 7 shows only the grid frame 8.
[0011]
First, the expandable grid unit 1 will be described with reference to FIG. In this case, a bundle member 5 whose middle portion is bendable by a snap-through type hinge portion 4 is disposed inside a frame body 3 in which four grid members 2 are connected in a rectangular frame shape in a pantograph-type deformable state. The cable is formed by extending eight cables 6 between both ends of the bundle 5 and each vertex of the frame 3. A small-diameter steel pipe or CFRP pipe can be suitably used as the grid material 2 and the bundle material 5, and a PC steel wire or CFRP cable can be suitably used as the cable 6.
[0012]
The structure according to the present embodiment has an annular shape as a whole by connecting the vertices of the frame body 3 in the grid unit 1 to each other and extending the chord members 7 between both ends of the adjacent bundle members 5. And a roof frame 9 attached to the inside of the grid frame 8, which functions as a roof of a large-scale structure. As the chord material 7, a PC steel wire or a CFRP cable can be suitably used similarly to the above-mentioned cable 6, and as the roof material 9, a foldable panel or a flexible sheet can be suitably used.
[0013]
The structure according to the present embodiment has a frame type 3 of each grid unit 1 which is a deployable type that can be deformed in a pantograph manner, and a bundle material 5 can be bent by a hinge part 4. As shown in Fig. 7, the whole is expandable and contractable, and the construction can be easily performed by expanding the whole from a contracted state. It can be easily removed and moved.
[0014]
That is, the above-described structure can be deformed from a state where the frame body 3 of each grid unit 1 is contracted as shown in FIG. 5A to a state where it is expanded as shown in FIG. 5B. At this time, the bundle 5 is changed from a state of being bent as shown in FIG. 6A to a state of being straight as shown in FIG. It has become. Each cable 6 and each string 7 are loose when the grid frame 8 is contracted, but when the grid frame 8 is expanded, a predetermined tension is naturally introduced to each cable 6 and each string 7. Their lengths are properly set in advance to be nervous.
[0015]
Therefore, the above-mentioned structure is assembled in a state where the annular grid frame 8 is cut off at important points as shown in FIG. 7 (a), and the circumferential direction is changed from that state as shown in (b) and (c). Can be constructed simply by connecting the two ends together, and can be contracted by the reverse procedure. At this time, when a foldable panel or a sheet having flexibility is adopted as the roofing material 9, the roofing material 9 can be developed and folded together with the grid frame 8.
[0016]
In this way, the above structure can be easily assembled simply by assembling it in a contracted state and deploying it at the construction site, and it is also possible to easily remove or move by shrinking, Furthermore, the form can be changed during use. Of course, since it can be used repeatedly by storing it in a contracted state and expanding it at a desired position as needed, and it can be easily removed by contracting, it is particularly suitable to be applied to a temporary structure. is there. Furthermore, it is also conceivable to apply the present invention to space structures such as a space station and a large-scale antenna provided in space by launching the spacecraft in a contracted state and mounting it on a rocket.
[0017]
When the grid frame 8 is unfolded from the contracted state, the bundle 5 is naturally stretched straight from the bent state, as shown in FIGS. It is preferable that the hinge portion 4 and the frame body 3 are connected by a connecting member 10. By providing such a connecting member 10, when the grid frame 8 is deployed, the hinge portion 4 is pushed forward by the connecting member 10, and the bundle member 5 naturally extends straight, and is provided by the snap-through hinge portion 4. This state is maintained, and when the grid frame 8 contracts, the hinge part 4 is pulled in toward the front side via the connecting member 10, and the bundle member 5 naturally bends.
[0018]
Further, it is preferable that the lengths of the cable 6 and the chord material 7 are appropriately set in advance as described above so that appropriate tension is naturally introduced to the grid frame 8 by expanding the grid frame 8. After the grid frame 8 is deployed, the cable 6 and the string material 7 may be re-tensioned to introduce an appropriate tension.
[0019]
Further, as described above, it is preferable that the hinge portion 4 of the bundle 5 and the frame body 3 are connected by the connecting member 10, but the connecting member 10 is omitted, and the bundle 5 is directly operated to extend or bend. It may be configured so as to make it.
[0020]
Although the embodiment of the present invention has been described above, the form and configuration of each part can be arbitrarily changed as long as the deployable string truss structure of the present invention is configured to be deployable. For example, the one shown in FIGS. 8 to 9 constitutes a larger-scale annular grid frame 8 by making the frame body 3 of the grid unit 1 into a substantially square shape, and extending a cable net 11 inside the grid frame 8. It is of a form supported and supported by six supports 12. The present invention is not limited to the above-described embodiment in which the grid frame 8 is formed into an annular shape and is developed in the circumferential direction, but is configured in such a manner that the grid frame 8 is formed in a rectangular shape and is developed in the horizontal direction. Of course, it is also possible.
[0021]
【The invention's effect】
According to the first aspect of the present invention, a bendable material having a hinge portion provided at an intermediate portion is disposed inside a frame body in which four grid members are connected in a rectangular frame shape in a pantographically deformable state. An expandable grid unit formed by stretching eight cables between both ends of the bundle and each vertex of the frame body is a constituent unit, and the vertex of the frame body of each grid unit is connected to each other. The grid frame is formed by connecting the cords between the bundles of adjacent grid units, and the chord is stretched between the bundles of adjacent grid units. Since the frame can be easily removed or moved by shrinking the frame, it is particularly suitable for application to a large-scale temporary structure or a structure provided in outer space.
[0022]
According to the second aspect of the present invention, the length of each cable and each chord is set so that a predetermined tension is naturally introduced to each cable and each chord when the grid frame is deployed. It is possible to naturally introduce an appropriate tension without being nervous.
[0023]
The invention according to claim 3 is configured such that the hinge portion of the bundle material in each grid unit and the frame body are connected by a connecting material, and the bundle material is pushed and pulled via the connecting material to bend as the frame body is deformed. Therefore, the bundle can be naturally straightened only by expanding the grid frame, and the bundle can be naturally bent by contracting the grid frame.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall schematic configuration of a deployable string truss structure according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a grid unit as a structural unit.
FIG. 3 is an overall plan view of the same.
FIG. 4 is a partially enlarged plan view and a side view of the same.
FIG. 5 is a partial plan view for explaining the expanded state.
FIG. 6 is a cross-sectional view for explaining a developed state.
FIG. 7 is an overall plan view for explaining the developed state.
FIG. 8 is a plan view and a side view showing an overall schematic configuration of a deployable string truss structure according to another embodiment of the present invention.
FIG. 9 is a partially enlarged view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Grid unit 2 Grid material 3 Frame body 4 Hinge part 5 Bundle material 6 Cable 7 String material 8 Grid frame 9 Roof material 10 Connecting material 11 Cable net 12 Support

Claims (3)

Inside a frame body in which four grid members are connected in a rectangular frame shape so as to be deformable in a pantograph style, a bendable member having a hinge portion provided at an intermediate portion is arranged, and both ends of the bundle member and the frame are provided. An expandable grid unit formed by stretching eight cables between each apex of the body is a constituent unit, and the apexes of the frame bodies of each grid unit are connected to each other to form an expandable grid frame. An expandable string truss structure, wherein the string member is formed and stretched between bundles of adjacent grid units. 2. The deployable string truss according to claim 1, wherein the length of each cable and each chord is set so that a predetermined tension is naturally introduced to each cable and each chord when the grid frame is deployed. Structure. A structure in which the hinge portion of the bundle material in each grid unit and the frame body are connected by a coupling material, and the bundle material is pushed and pulled through the coupling material to bend as the frame body is deformed. 3. The deployable string truss structure according to 1 or 2.

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