Construction method of structure

Abstract

To provide a construction method of a structure excellent in transportability and workability capable of efficiently constructing a building.SOLUTION: A construction method of a structure (1) constitutes at least a part of an inner structure of a building and is allowed to be deployed in a X direction, a Y direction, and a Z direction orthogonal to each other, wherein the structure (1) is a structure of which a size of a specific direction of the X direction, the Y direction, and the Z direction before deployed is smaller than that after deployed, comprising: a processing process (S104) processing the structure (1) before deployment; a transporting process (S102) transporting the structure (1) before deployment to an installation place after deployment; a deploying and installing process (S103) deploying and installing the transported structure (1); and a fixing process (S104) fixing the deployed structure (1) using a fixation mechanism.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a construction method for a structure. [Background technology]

[0002] In the past, when constructing a building, a truss structure formed by combining rod-shaped members such as wood or steel pipes into a polygonal shape has been widely used as a structural member that constitutes part of the building. For example, Patent Document 1 discloses a technology related to a truss structure that is easy to design and assemble because it is a tetrahedral truss made by combining triangles, filling the space without gaps, and does not have a pentahedral structure that is weak and easily deformed, but has high strength and a simple structure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-211438 A Summary of the Invention [Problem to be solved by the invention]

[0004] Recently, technology for forming structures such as truss structures using machine tools such as 3D printers and robot arms has been researched and put into practical use. However, when using such machine tools, the size of the structure that can be formed is limited due to restrictions on the range of motion of the machine tools themselves, making it difficult to apply this to large structures. Even if a large structure can be formed, there is a problem that transportability and workability are insufficient when transporting it to a construction site and constructing it.

[0005] The present invention has been made in consideration of such problems, and its object is to provide a construction method for a structure which is easy to transport and work, and enables efficient construction of buildings. [Means for solving the problem]

[0006] The main invention for achieving the above object is a construction method for a structure that constitutes at least a part of the internal structure of a building and is expandable in mutually perpendicular X, Y, and Z directions, wherein the dimension of the structure in a predetermined direction among the X, Y, and Z directions before expansion is smaller than the dimension of the predetermined direction after expansion, the construction method for a structure having a processing step of processing the structure before expansion, a transporting step of transporting the structure before expansion to an installation site where the structure will be installed after expansion, an expansion and installation step of expanding and installing the transported structure, and a fixing step of fixing the expanded structure by a fixing mechanism.

[0007] Other features of the present invention will become apparent from the following detailed description of the present invention and the accompanying drawings. Effect of the Invention

[0008] According to the present invention, a construction method for a structure can be provided which is excellent in transportability and workability and enables efficient construction of a building. [Brief description of the drawings]

[0009] [Figure 1] FIG. 13 is a diagram illustrating a case where a truss structure is used as the internal structure of a roof of a building. [Diagram 2] FIG. 2 is a flow diagram illustrating a construction method for a structure according to the present embodiment. [Diagram 3] 3A and 3B are diagrams for explaining the processed structure 1 in the processing step. [Figure 4] 2 is a diagram illustrating the configuration of a rod-shaped member 10 and a joint portion 20. FIG. [Diagram 5] 5A and 5B are diagrams illustrating an example of a method for processing the rod-shaped member 10 and the joint portion 20. FIG. [Figure 6] 1A to 1C are diagrams illustrating the extension and contraction mechanism of a rod-shaped member 10. [Figure 7] 2A to 2C are diagrams illustrating an example of a fixing mechanism provided on a rod-shaped member 10. [Figure 8] 10A to 10C are diagrams illustrating another example of a fixing mechanism provided on the rod-shaped member 10. [Figure 9] 1A and 1B are diagrams illustrating a scissors structure 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] At least the following matters will become apparent from the description of this specification and the accompanying drawings. A construction method for a structure that constitutes at least a part of an internal structure of a building, and that is expandable in mutually perpendicular X, Y, and Z directions, wherein a dimension of the structure in a predetermined direction among the X, Y, and Z directions before expansion is smaller than a dimension of the predetermined direction after expansion, the construction method for a structure comprising the steps of: a processing step of processing the structure before expansion; a transporting step of transporting the structure before expansion to an installation site where the structure will be installed after expansion; an expansion and installation step of expanding and installing the transported structure; and a fixing step of fixing the expanded structure by a fixing mechanism.

[0011] According to this method of constructing a structure, the dimensions before deployment are smaller than the dimensions after deployment, so there are fewer constraints when processing the structure. For example, even if a machine tool (such as a 3D printer or a robot arm) with a small range of motion has difficulty processing a large structure after deployment, it is easy to process the structure if it has small dimensions before deployment. Furthermore, since the dimensions before deployment are small, the structure is easy to transport to the construction site, and can be stabilized as an internal structure of a building by fixing it after deployment, so it is also easy to construct.

[0012] In the construction method for such a structure, it is desirable that the unfolding is unfolding from a folded state to an unfolded state.

[0013] According to this construction method for a structure, after transporting it to the installation site of a building, the dimensions can be easily expanded at the installation site, and it is easy to apply to interior structures that occupy a large area, such as the roof of a building. In addition, there is no need to cut or machine the members to unfold it from the folded state, making it easy to construct.

[0014] In the method for constructing such a structure, it is desirable that the structure and the fixing mechanism are integrally formed in the processing step.

[0015] According to such a method for constructing a structure, it is possible to make the processing steps more efficient, and since a fixing mechanism is provided from the beginning, it is possible to further improve the ease of construction in the deployment and installation steps and the fixing steps.

[0016] In the construction method for such a structure, it is desirable that the structure is a truss structure in which members are pin-jointed, and that the unfolding is performed by rotation at the pin joints.

[0017] According to this type of construction method for a structure, the structure can be deployed by rotating at the pin joints, so that the structure can be deployed easily and safely without generating bending moments in the components that make up the structure.

[0018] In the construction method for such a structure, it is desirable that the structure is a truss structure in which members are pin-jointed, and that the unfolding is achieved by expansion and contraction of the members.

[0019] According to such a construction method for a structure, the structure can be unfolded by the expansion and contraction of the members that make up the structure, so that the structure can be unfolded easily and safely.

[0020] In the method for constructing such a structure, it is desirable that the structure has a plurality of parts, and the fixing mechanism fixes the parts together by a plug-in type joint.

[0021] According to this construction method for a structure, the structure is prevented from returning to its pre-deployment state after deployment, and the structure can be stabilized as an internal structure of a building. In addition, the fixing mechanism can be integrally formed with other parts that constitute the structure in the processing step, and no other fixing devices are required for fixing, which provides excellent construction properties.

[0022] In the construction method for such a structure, it is desirable that the structure has a plurality of components, and the fixing mechanism fixes the components together by bolt joints.

[0023] According to this construction method for a structure, the structure is prevented from returning to its pre-deployment state after deployment, and the structure can be stabilized as an internal structure of a building. In addition, the fixing mechanism can be integrally formed with other parts that constitute the structure in a processing step. Furthermore, it is possible to easily join the structure using bolts without requiring special tools or techniques, and the construction is easy.

[0024] In a method of constructing such a structure, the structure is a scissors structure having a plurality of strut members which are connected at intersections so as to be able to open and close, and the deployment is preferably achieved by bringing one ends of the strut members close to each other so that the other ends of the strut members extend toward each other.

[0025] According to this method of constructing a structure, the dimensions before deployment are smaller than the dimensions after deployment, so there are fewer constraints when processing the structure. In addition, since the dimensions before deployment are small, the structure is easy to transport to the construction site, and since no special tools or techniques are required for deployment and fixing, it is also easy to work with.

[0026] In the method for constructing such a structure, it is desirable that the structure is processed using a 3D printer.

[0027] According to this method of constructing a structure, by using a 3D printer, processing can be carried out more efficiently than when cutting processing or the like is performed.

[0028] === Implementation form === <About the truss structure> A truss structure will be described as an example of a structure related to the construction method of this embodiment. Fig. 1 is a diagram illustrating a case where a truss structure is used as an internal structure of a roof of a building.

[0029] A truss structure is a structure in which a number of rod-shaped members are combined together and connected at their nodes with bolts or the like to form triangles, and the triangles are then joined together to form a framework. In FIG. 1, the truss structure is arranged to span four vertical columns to form the internal structure of a building roof. Such a truss structure is generally structured such that it is resistant to bending moments and deformation even when a load is applied, whereas compressive and tensile forces act in the axial direction of the rod-shaped members. Therefore, it is suitable as a structure for constituting a large building, such as a dome or a bridge frame.

[0030] 1 shows an example of the truss structure being used for the roof of a building, but the truss structure according to this embodiment can be applied to other internal structures besides the roof of a building. For example, the columns and entire structure of a building may be made of the truss structure.

[0031] The truss structure can be a planar truss structure made by connecting triangles two-dimensionally, or a three-dimensional truss structure made by connecting triangles three-dimensionally. By spanning four columns, the three-dimensional truss structure can form a stable framework for the roof over a wide area. By using the truss structure, the internal structure of the building can be made lightweight and strong.

[0032] However, when installing such a truss structure over a wide area such as the roof of a building, the size (dimensions) of the truss structure itself must be large, which may cause problems. For example, when manufacturing a truss structure in a manufacturing factory and transporting it to an installation location (e.g., a building construction site), problems such as a trailer with a large loading platform may be required, or the number of truss structures that can be transported at one time may be reduced. In addition, after transporting the truss structure to the installation location, a large storage space may need to be secured until the truss structure is actually installed on the building, and a sufficiently large working space may need to be secured when performing installation work. For these reasons, it may be difficult to improve transportability and workability when performing construction work.

[0033] Furthermore, since there is a size limit for the manufacturing equipment for forming (manufacturing) the truss structure, it may be difficult to form a large truss structure. In particular, in recent years, attention has been focused on technology for automatically manufacturing truss structures with high precision using machine tools such as 3D printers and robot arms, but the restrictions on the range of motion (machining range) of such machine tools may make it difficult to form (manufacture) a large truss structure.

[0034] Therefore, in this embodiment, a structure (truss structure) that can be deployed in a predetermined direction among the mutually orthogonal X, Y, and Z directions is manufactured and installed as an internal structure of a building. That is, the structure is manufactured in a folded state before deployment and transported to the installation site, and the folded structure is deployed at the installation site and installed in the building in an unfolded state. In this way, by using a structure (truss structure) that has small dimensions before deployment and larger dimensions after deployment than before deployment, it is possible to efficiently construct a building. Below, a construction method of the structure according to this embodiment will be specifically described.

[0035] <Construction method of the structure> Fig. 2 is a flow diagram for explaining a construction method of a structure according to this embodiment. By sequentially carrying out the steps S101 to S104 shown in Fig. 2, a deployable truss structure 1 (hereinafter also simply referred to as "structure 1") can be formed, transported to an installation site, and deployed and installed.

[0036] First, a processing step is carried out to process (manufacture) the deployable structure 1 in a pre-deployed state (S101). The processing step is basically carried out in a manufacturing factory where machine tools for processing the structure 1 are installed, but the processing step may also be carried out at a construction site of a building (an installation location where the structure 1 is installed).

[0037] Figures 3A and 3B are diagrams for explaining the structure 1 processed (manufactured) in the processing step. Figure 3A is a perspective view of the structure 1 before unfolding, and shows the structure 1 in a folded state processed (manufactured) in the processing step (S101). Figure 3B is a perspective view of the structure 1 after unfolding, and shows the structure 1 in a state unfolded in the unfolding and setting step (S103) described below. Also, in Figures 3A and 3B, orthogonal X, Y, and Z directions are defined.

[0038] As shown in FIG. 3, the structure 1 of this embodiment has a plurality of rod-shaped members 10, 10... and a plurality of joints 20, 20... that are provided to cover the ends of the rod-shaped members 10 in the axial direction (longitudinal direction) and rotatably join the rod-shaped members 10 to each other. The ends of the four rod-shaped members 10 are rotatably joined to each other by the joints 20 (see FIG. 4), thereby forming a truss structure. That is, the nodes of the rod-shaped members 10 are pin-joined via the joints 20. Note that a part of the rod-shaped member 10 is always provided with an extension mechanism for extending and retracting in the axial direction, or a fixing mechanism for fixing the cut parts between two adjacent joints 20, 20, which are arranged in a cut state. The extension mechanism and the fixing mechanism will be described later.

[0039] FIG. 4 is a diagram for explaining the configuration of the rod-shaped member 10 and the joint 20. The rod-shaped member has a shaft portion 11 and a protruding portion 12. The shaft portion 11 is a portion having a predetermined length in the axial direction (longitudinal direction) and is formed of a material such as metal or resin. The shaft portion 11 can be, for example, columnar or cylindrical, but the cross-sectional shape may be formed into a star shape or other shape using a 3D printer or the like described later, or the cross-sectional shape may be formed so that it gradually changes. The inside of the shaft portion may have a lattice structure, or the shaft portion may be designed by topology optimization. The protruding portion 12 is provided at both ends of the shaft portion 11 in the axial direction (longitudinal direction), is a substantially spherical portion having a diameter larger than the diameter of the shaft portion 11, and is formed of the same material as the shaft portion 11. The joint 20 is a substantially spherical member larger than the protruding portion 12 of the rod-shaped member 10, and has a plurality of grooves 21 on its surface. Each groove 21 is formed along the Z direction, and the protrusion 12 of the rod-shaped member 10 can be held inside the groove 21 in a rotatable state without coming off the groove 21. In this way, the joint 20 functions as a joint between the multiple rod-shaped members 10.

[0040] In Fig. 4, grooves 21 are provided on both sides of the joint 20 in the X and Y directions, and the protrusions 12 of the rod-shaped members 10 are held in the respective grooves 21. In this embodiment, before unfolding, each of the four rod-shaped members 10 is folded in the Z direction along the grooves 21 (see Figs. 3A and 4), but by rotating the protrusions 12 within the grooves 21, each of the four rod-shaped members 10 can be unfolded in the X or Y direction (see Figs. 3B and 4). However, the number of rod-shaped members 10 joined by one joint 20 may be more or less than four.

[0041] The rod-shaped member 10 and the joints 20 are integrally formed in the processing step (S101). Figures 5A and 5B are diagrams for explaining an example of a method for processing the rod-shaped member 10 and the joints 20. Here, an example is explained in which a 3D printer is used to stack resin layers to form (process) the rod-shaped member 10 and the joints 20. By using a 3D printer, it is possible to manufacture a nested structure that is not possible by cutting processing or the like.

[0042] First, the shaft portion 11 and the protrusions 12 of the rod-shaped member 10 are integrally formed (machined) as shown in Fig. 5A. In Fig. 5A, the protrusions 12 are formed only on one side in the axial direction (longitudinal direction) of the shaft portion 11, but the protrusions 12 may be formed on both sides in the axial direction of the shaft portion 11. Furthermore, a plurality of rod-shaped members 10 may be formed (machined) at the same time.

[0043] Next, a thin-film spacer member 50 is formed by a 3D printer so as to cover the surface of the protrusion 12 of the rod-shaped member 10. The spacer member 50 is a member for providing a predetermined distance (gap) between the outer surface of the protrusion 12 and the inner surface of the groove 21, and can be easily removed when the structure 1 is developed.

[0044] Next, the joint 20 is formed (processed) so as to cover the protrusion 12 of the rod-shaped member 10 and the spacer member 50. That is, the joint 20 having the groove 21 is formed by overlapping a resin layer on the region shown by the hatched portion in FIG. 5B. As a result, the structure 1 is formed (processed) in a state in which the protrusion 12 of the rod-shaped member 10 is held by the groove 21 of the joint 20. When the structure 1 is deployed, a predetermined gap is formed between the groove 21 and the protrusion 12 by removing the spacer member 50, and the protrusion 12 is rotatably held inside the groove 21, and the rod-shaped member 10 can be deployed as described in FIG. 4. In this way, by using a 3D printer, the deployable structure 1 can be integrally formed (processed) in a folded state.

[0045] Although the example of integrally forming the rod-shaped member 10 and the joint 20 by stacking resin layers using a 3D printer has been described, the metal rod-shaped member 10 and the joint 20 may be integrally formed by using, for example, powdered sintered metal. The rod-shaped member 10 and the joint 20 may be integrally formed by using a machine tool other than a 3D printer, such as a robot arm. In these cases, the spacer member 50 is not necessarily required. The joint 20 during production does not necessarily need to be held by the rod-shaped member 10, and may be produced in a state where it is held on a separate production bed. The stacking direction is not limited to a horizontal plane, and may be stacked along the protrusion 12.

[0046] The rod-shaped members 10 of the structure 1 are rotatably joined at the joints 20 as contact points, so that they can be unfolded from a folded state, but the rod-shaped members 10 themselves may be provided with an extension mechanism so that the structure 1 can be unfolded. Also, the rod-shaped members 10 may be rotatably joined at the joints 20 and provided with an extension function so that the structure 1 can be unfolded to a larger extent.

[0047] 6 is a diagram illustrating the telescopic mechanism of the rod-shaped member 10. As shown in FIG. 6, the telescopic mechanism is composed of an axis-shaped piston portion 111 and a hollow cylindrical cylinder portion 112, and the piston portion 111 slides along the axial direction while being supported inside the cylinder portion 112, thereby changing the length of the axis portion 11. That is, in the structure 1 before deployment, the piston portion 111 is housed inside the cylinder portion 112, and when the structure 1 is deployed, the piston portion 111 slides outward from the cylinder portion 112, thereby making the axis portion 11 longer than in the state before deployment.

[0048] In addition, in the shaft portion 11 of FIG. 6, a bolt hole 113 for inserting a fixing bolt is provided on the side surface of the cylinder portion 112. By inserting a bolt 115 into the bolt hole 113 to fix the piston portion 111 while the piston portion 111 is slid, the relative position of the piston portion 111 with respect to the cylinder portion 112 can be fixed. This allows the shaft portion 11 after deployment to be fixed at a predetermined length. Also, the position of the piston portion 111 may be fixed by crimping the cylinder portion 112 without using the bolt 115. In particular, when the piston portion 111 and the cylinder portion 112 are formed in a shape having an uneven cross section (for example, a star shape) using a 3D printer or the like, the piston portion 111 and the cylinder portion 112 are easily brought into close contact with each other by crimping, and are easily fixed more firmly.

[0049] The rod-shaped member 10 (shaft portion 11) equipped with the telescopic mechanism can be formed (processed) using a 3D printer or the like in a manner substantially similar to the method described in FIG. 5A and FIG. 5B. For example, the piston portion 111 is first formed, a sheet-like spacer member 50 (not shown in FIG. 6) is formed so as to cover the outer peripheral surface of the piston portion 111, and then the cylinder portion 112 is formed on the spacer member 50. Then, by removing the spacer member 50, it is possible to form a telescopic mechanism in which the piston portion 111 can slide in the axial direction while being supported inside the cylinder portion 112. Note that, when forming the rod-shaped member 10 shown in FIG. 6, the spacer member 50 does not necessarily have to be provided, as described above.

[0050] Thus, in the processing step (S101) of this embodiment, the structure 1 can be formed (processed) in a folded state before being unfolded. The structure 1 before being unfolded shown in Fig. 3A has smaller dimensions in a predetermined direction (X direction and Y direction in Fig. 3) among the X direction, Y direction, and Z direction, and can be formed in a compact form, compared to the structure 1 after being unfolded shown in Fig. 3B. Therefore, even if the movable range (machining range) of a machine tool such as a 3D printer or a robot arm is small, a structure 1 that has a larger dimension after being unfolded can be formed.

[0051] Returning to FIG. 2, after the structure 1 is processed (formed) in the processing step (S101), a transport step is carried out to transport the structure 1 to an installation location (e.g., a building construction site) where the structure 1 will be installed (S102). As described above, the structure 1 of this embodiment is processed (formed) in a pre-deployed state, which has smaller dimensions than the unfolded state, and therefore the transport operation can be carried out efficiently. For example, compared to a case where the structure 1 in the unfolded state shown in FIG. 3B is loaded onto a trailer and transported to the installation location, the structure 1 in the pre-deployed state shown in FIG. 3A can be loaded onto the same trailer in larger quantities, and therefore transport can be carried out efficiently.

[0052] Next, the transported structure 1 (before deployment) is deployed at the installation site, and a deployment and installation process is carried out in which the structure 1 is installed in the target building (S103). The structure 1 is deployed by unfolding the rod-shaped members 10 that are folded with the joints 20 as contact points, and by extending the rod-shaped members 10 that are provided with an extension mechanism (see Figs. 3A and 3B).

[0053] As described in FIG. 4, the structure 1 has a truss structure in which a plurality of rod-shaped members 10 are rotatably joined together by joints 20. The orientation (axial direction) of the rod-shaped members 10 is changed by rotating the protrusions 12 of each rod-shaped member 10 held in the grooves 21 of the joints 20. This allows the rod-shaped members 10 that have been folded in the Z-axis direction to be unfolded in the X- and Y-directions. That is, the rod-shaped members 10 that are pin-joined at the joints 20 are rotated at the pin joints to unfold the structure 1. Since unfolding is possible by rotation at the pin joints, the structure 1 can be unfolded easily and safely without generating bending moment in the rod-shaped members 10.

[0054] 6, a part of the rod-shaped member 10 has an extension mechanism in which the piston portion 111 is supported so as to be slidable inside the cylinder portion 112. Then, by sliding the piston portion 111 outward while it is housed inside the cylinder portion 112, the length in the axial direction of the rod-shaped member 10 (shaft portion 11) can be extended. In other words, the structure 1 can be deployed by extending and retracting the rod-shaped member 10 that constitutes the structure 1. Since the structure 1 can be deployed by extending and retracting the rod-shaped member 10, the structure 1 can be deployed easily and safely.

[0055] Next, a fixing step is performed in which the unfolded structure 1 is fixed by a fixing mechanism (S104). The structure 1 unfolded from the unfolded state of Fig. 3A to the state of Fig. 3B needs to be fixed in a predetermined unfolded state to be stabilized as an internal structure of the building in order to prevent it from being folded again and returning to the unfolded state of Fig. 3A. Therefore, the structure 1 of this embodiment is provided with a fixing mechanism for fixing the shape in the unfolded state.

[0056] FIG. 7 is a diagram for explaining an example of a fixing mechanism provided on a rod-shaped member 10. The shaft portion 11 of the rod-shaped member 10 shown in FIG. 7 is divided into two parts in the axial direction before deployment (before being fixed). In FIG. 7, one side of the shaft portion 11 divided into two parts in the axial direction is the one-side shaft portion 11A, and the other side is the other-side shaft portion 11B. The tip portion of each of the shaft portions 11A and 11B is divided into a plurality of parts in the circumferential direction. In FIG. 7, the other end portion (tip portion) of the shaft portion 11A in the axial direction is divided into four parts in the circumferential direction, and one-side mating portion 11Am is formed in a shape in which parts of a sector-shaped cross section having a central angle of 90 degrees face each other (opposing) is provided. Similarly, the one end portion (tip portion) of the shaft portion 11B in the axial direction is divided into four parts in the circumferential direction, and other-side mating portion 11Bm is formed in a shape in which parts of a sector-shaped cross section having a central angle of 90 degrees face each other (opposing) is provided.

[0057] The one-side mating portion 11Am and the other-side mating portion 11Bm are provided so as to be in a positional relationship shifted by 90 degrees in the circumferential direction, and when the one-side shaft portion 11A and the other-side shaft portion 11B are inserted so that their tips face each other, the one-side mating portion 11Am and the other-side mating portion 11Bm are mated as shown in Fig. 7. As a result, the one-side shaft portion 11A and the other-side shaft portion 11B are fixed and integrated in a so-called interference fit state. In other words, the one-side mating portion 11Am and the other-side mating portion 11Bm function as a fixing mechanism that fixes the one-side shaft portion 11A and the other-side shaft portion 11B by a plug-in type joint.

[0058] Fixing the rod-shaped members 10 with such an insert-type fixing mechanism prevents the structure 1 from returning to its pre-deployment state after deployment, and stabilizes the structure 1 as an internal structure of a building. In addition, the one-side joint portion 11Am and the other-side joint portion 11Bm serving as the fixing mechanism can be integrally formed with other parts constituting the structure 1 in the processing step (S101), and no other fixing tools or the like are required for fixing, resulting in excellent workability.

[0059] FIG. 8 is a diagram for explaining another example of a fixing mechanism provided on a rod-shaped member 10. The shaft portion 11 of the rod-shaped member 10 shown in FIG. 8 is divided into two parts in the axial direction as in FIG. 7, with one side of the shaft portion 11 being a one-side shaft portion 11A and the other side being an other-side shaft portion 11B. A flange portion that can be joined by a fastening bolt or the like is provided at the tip of each of the shaft portions 11A and 11B. In FIG. 8, a one-side flange portion 11Af is provided at the end portion (tip portion) on the other side in the axial direction of the shaft portion 11A. Similarly, a other-side flange portion 11Bf is provided at the end portion (tip portion) on one side in the axial direction of the shaft portion 11B.

[0060] Then, one-side flange portion 11Af and the other-side flange portion 11Bf are opposed to each other so that the tip ends of one-side shaft portion 11A and the other-side shaft portion 11B are butted against each other, and the two are fastened together using bolts and nuts, whereby one-side shaft portion 11A and the other-side shaft portion 11B are fixed in an integrated state. That is, one-side flange portion 11Af and the other-side flange portion 11Bf function as a fixing mechanism that fixes one-side shaft portion 11A and the other-side shaft portion 11B by bolting.

[0061] Fixing the rod-shaped members 10 with such a bolt-jointed fixing mechanism prevents the deployed structure 1 from returning to its pre-deployed state, and stabilizes the structure 1 as an internal structure of a building. Moreover, the one-side flange portion 11Af and the other-side flange portion 11Bf serving as the fixing mechanism can be integrally formed with other parts constituting the structure 1 in the processing step (S101). Furthermore, because the joining is performed using bolts, no special tools or techniques are required, and joining can be easily performed, resulting in excellent workability.

[0062] As described above, by going through the steps of S101 to S104, the structure 1 can be processed (manufactured) and installed as an internal structure of a building. Since the dimensions of the structure 1 in this embodiment before deployment are smaller than the dimensions after deployment, there are fewer constraints when processing the structure 1. For example, even if a machine tool (such as a 3D printer or a robot arm) with a small range of motion has difficulty processing the structure 1 with its large dimensions after deployment, it is easy to process the structure 1 if it has the dimensions before deployment. Furthermore, since the dimensions before deployment are small, the structure 1 is easy to transport to the installation location, and can be stabilized as an internal structure of a building by fixing it after deployment, so it is also easy to install.

[0063] In addition, because the structure 1 can be unfolded from a folded state to an unfolded state, it can be easily expanded in size at the installation site of a building after being transported thereto, and is easily applicable to interior structures that occupy a large area, such as the roof of a building. In addition, no cutting or machining of components is required to unfold the structure from a folded state, making it easy to install.

[0064] Furthermore, the structure 1 equipped with such an unfolding mechanism is equipped with a fixing mechanism for fixing the shape after unfolding, and the structure 1 equipped with the unfolding mechanism and the fixing mechanism are integrally formed in a processing step (S101 in FIG. 2). This makes the processing step (S101) more efficient, and since the structure 1 is provided with the fixing mechanism from the beginning, it is possible to further improve the ease of construction in the unfolding and setting step (S103) and the fixing step (S104).

[0065] <Modification> Although the truss structure 1 has been described as an example of a method for constructing a structure whose dimensions become larger when unfolded than before, the method for constructing a structure according to this embodiment can also be applied to structures other than truss structures. For example, as a modified example of a structure, a scissors structure 2 in which multiple strut members are connected at intersections so as to be able to be opened and closed will be described.

[0066] Fig. 9 is a diagram for explaining the scissors structure 2. Fig. 9A shows the scissors structure 2 before unfolding, and Fig. 9B shows the scissors structure 2 after unfolding. Also, as shown in Fig. 9A and Fig. 9B, an X direction and a Y direction that are perpendicular to each other are defined (Z direction is not shown).

[0067] The scissors structure 2 has unit scissors 30u connected so as to be able to open and close at an intersection 35 where two strut members 30, 30 intersect in the center, and in Fig. 9A is configured by connecting a plurality of unit scissors 30u adjacent in the X direction at end portions 36. The intersection portion 35 and end portions 36 each connect the strut members 30 so as to be able to rotate (open and close) on the XY plane.

[0068] 9A, when a unit scissors 30u is formed by certain strut members 30a and 30b, an end portion on one side in the X direction of strut member 30a is designated as 36a1 and an end portion on the other side is designated as 36a2, and an end portion on one side in the X direction of strut member 30b is designated as 36b1 and an end portion on the other side is designated as 36b2. When strut members 30a, 30b are moved from this state so that end portion 36a1 on one side of strut member 30a and end portion 36b1 on one side of strut member 30b approach each other in the Y direction, end portion 36a2 on the other side of strut member 30a and end portion 36b2 on the other side of strut member 30b move to the other side in the X direction. In other words, by bringing one ends of two strut members 30a, 30b forming unit scissors 30u closer to each other, the other ends of the strut members 30a, 30b extend to the other side. As a result, the scissors structure 2 is unfolded as shown in FIG. 9B, and the dimension in the X direction can be made larger than before unfolding.

[0069] Like the truss structure 1, the scissors structure 2 is also provided with a fixing mechanism for fixing each part in the expanded state shown in FIG. 9B. For example, the ends of the strut members 30, 30 constituting the unit scissors 30u are restrained by the restraining member 31, so that the scissors structure 2 can be fixed in the expanded state. The restraining member 31 is a member made of linear steel (e.g., L-shaped steel) or the like, and in FIG. 9B, it is arranged so as to bridge the ends (e.g., ends 36a2 and 36b1) of one side of the two strut members 30, 30 in the Y direction, thereby restraining the distance in the X direction of the unit scissors 30u to a predetermined length. In addition, the restraining member 32 may be arranged so as to bridge the ends (e.g., ends 36a1 and 36b1) of one side of the two strut members 30, 30 in the X direction, thereby restraining the distance in the Y direction of the unit scissors 30u to a predetermined length. In this way, by restraining the strut members 30, 30 at at least one location using the restraining members 31, 32, it is possible to fix the scissors structure 2 in its deployed shape. At this time, the position at which the strut members 30, 30 are restrained is arbitrary, but in consideration of ease of construction in the fixing step (S104), it is preferable to restrain the strut members 30, 30 at the end of the scissors structure 2, as shown in Fig. 9B. Also, the scissors structure 2 after deployment may be fixed using a method other than the restraining members 31, 32.

[0070] The scissors structure 2 in the modified example can be integrally formed using a machine tool such as a 3D printer or a robot arm, just like the truss structure 1 described above, and can be transported to the installation site in a compact unfolded shape, deployed and installed at the installation site, and fixed in the deployed state by a fixing mechanism. This provides excellent transportability and workability, and enables efficient construction of buildings.

[0071] ===Other embodiments=== The above-mentioned embodiment is for the purpose of facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents thereof. [Explanation of symbols]

[0072] 1 Structure (truss structure), 2 Structure (Scissors structure), 10 rod-shaped member, 11 Shaft portion, 11A one side shaft portion, 11Am one side mating portion, 11Af one side flange portion, 11B other side shaft portion, 11Bm other side mating portion, 11Bf other side flange portion, 111 piston part, 112 cylinder part, 113 bolt hole, 115 bolt, 12 protrusions; 20 joints, 21 Groove portion, 30 Strut member, 30u unit scissors, 31 Restraint member, 32 Restraint member, 35 intersection, 36 end, 50 Spacer member

Claims

1. A construction method for a structure that constitutes at least a part of the internal structure of a building and can be expanded in mutually orthogonal X, Y, and Z directions, the structure has a dimension in a predetermined direction among the X direction, the Y direction, and the Z direction before deployment that is smaller than a dimension in the predetermined direction after deployment, a processing step of processing the structure before the deployment; a transporting step of transporting the structure before the deployment to an installation site where the structure will be installed after the deployment; a deployment and installation process of deploying and installing the transported structure; a fixing step of fixing the deployed structure by a fixing mechanism; A construction method for a structure having the above structure.

2. A method for constructing a structure according to claim 1, comprising the steps of: A construction method for a structure, wherein the unfolding is from a folded state to an unfolded state.

3. A method for constructing a structure according to claim 1 or 2, comprising the steps of: A construction method for a structure, characterized in that, in the processing step, the structure and the fixing mechanism are integrally formed.

4. A method for constructing a structure according to claim 3, comprising the steps of: The structure is a truss structure in which members are pin-jointed, A construction method for a structure, characterized in that the deployment is achieved by rotation at the pin joints.

5. A method for constructing a structure according to claim 3, comprising the steps of: The structure is a truss structure in which members are pin-jointed, A construction method for a structure, characterized in that the unfolding is achieved by expansion and contraction of the members.

6. A method for constructing a structure according to claim 3, comprising the steps of: The structure includes a plurality of parts, A construction method for a structure, characterized in that the fixing mechanism fixes the parts together by a plug-in type joint.

7. A method for constructing a structure according to claim 3, comprising the steps of: The structure includes a plurality of parts, A construction method for a structure, characterized in that the fixing mechanism fixes the parts together by bolt joints.

8. A method for constructing a structure according to claim 1 or 2, comprising the steps of: The structure includes a plurality of strut members, The strut members are connected at their intersections in a scissors structure that can be opened and closed, and the deployment is performed by bringing one end of each of the strut members close to each other, so that the other end of the strut member extends toward the other end.

9. A method for constructing a structure according to claim 1 or 2, comprising the steps of: A method for constructing a structure, wherein the structure is processed using a 3D printer.

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