Structure and method for forming the structure

Abstract

To provide a structure which can be efficiently formed and a structure formation method.SOLUTION: A structure comprises long side parts 11, 13 composed by laminating mortars, and a separator 20. The separator 20 connects the long side parts 11, 13, and comprises a support part 21 and a body part 25 formed by the lamination of the mortars. The support part 21 comprises: projection parts 21a, 21b formed by projecting from the long side parts 11, 13; and projection parts 22a, 22b further projected from the projection parts 21a, 21b in a directly upper layer of the projection parts 21a, 21b. The body part 25 is supported by the support part 21, and is composed by alternately laminating mortar parts L21, L22 having loop shape parts 27, 28 projected from the long side parts 11, 13.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a structure formed by layering mortar discharged from a moving nozzle, and a method for forming the structure. [Background technology]

[0002] Three-dimensional (3D) printers are sometimes used to create three-dimensional structures such as buildings. These 3D printers eject material from a nozzle while moving the nozzle to form layers, and gradually stack the layers to create a three-dimensional structure. Because cement-based materials such as concrete have low tensile strength, techniques for creating structures with high tensile strength have been investigated (see, for example, Patent Document 1). The structure described in this document includes an outer body having holes that define the outer shape of the structure, and an inner body formed by injecting a second mortar into the holes in the outer body. The outer body is formed by alternately stacking odd-numbered and even-numbered layers by ejecting a first mortar from the 3D printer's nozzle and moving it along a path. The inner body is formed from a second mortar that forms a stronger member than the first mortar that forms the outer body.

[0003] When a second mortar is injected into a frame formed by layering the first mortar, the injected second mortar applies pressure (lateral pressure) from the sides of the frame. In this case, if the lateral pressure is too great compared to the strength of the frame, the frame may be damaged. Therefore, a technology for resisting the lateral pressure with a simple configuration has been investigated (see, for example, Patent Document 2). In this technology, metal separators (connecting members) with their respective ends placed on top of an outer frame and an inner frame formed to a predetermined height by layering mortar using a 3D printer are placed on top of the outer frame and the inner frame. Then, after further layering mortar on the separator to form the outer frame and the inner frame, the second mortar is injected. This embeds the center of the separator in the second mortar. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-026686 [Patent Document 2] Patent Publication No. 2021-062488 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when placing a metal separator, it was necessary to temporarily stop the dispensing of mortar at the placement position. Then, after the separator was placed, mortar had to be dispensed again to stack the separator. This required time and effort, and it was difficult to efficiently form the structure. [Means for solving the problem]

[0006] The structure that solves the above problem is: No. 1 The wall portion is made by laminating mortar and has a protruding portion. The structure includes an outer structure and an inner structure made of a second mortar that is configured inside the outer structure and has a higher strength than the first mortar. The structure, wherein the protruding portion is No. 1 a support portion formed by laminating mortar and protruding from the wall portion; No. 1 and a main body formed by laminating mortar and supported by the support portion, the support portion having a first protruding portion formed to protrude from the wall portion and a second protruding portion further protruding from the first protruding portion in a layer immediately above the first protruding portion. The first protrusion is formed with a protrusion amount that can support the tip of the first mortar of the second protrusion without dropping due to its weight, and the main body is connected to an opposing portion of the outer body so as to resist lateral pressure applied to the side of the outer body by the material filled inside the outer body. . [Effects of the Invention]

[0007] According to the present invention, structures can be formed efficiently. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view of a structure according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing the arrangement of protruding portions of a structure in the embodiment. [Figure 3]FIG. 2 is a cross-sectional front view of a main part of the structure according to the embodiment. [Figure 4] 10A and 10B are explanatory views illustrating mortar portions in portions other than the protruding portion in the embodiment. [Figure 5] FIG. 10 is an explanatory diagram of a mortar portion of the bottom layer of the support portion for the protruding portion in the embodiment. [Figure 6] 10 is an explanatory diagram of a mortar portion of an intermediate layer of a support portion for a protruding shape portion in an embodiment. FIG. [Figure 7] FIG. 10 is an explanatory diagram of the mortar portion of the uppermost layer of the support portion for the protruding portion in the embodiment. [Figure 8] FIG. 4 is an explanatory view of a first mortar layer of a main body of a protruding portion in an embodiment. [Figure 9] FIG. 10 is an explanatory view of a second mortar layer of the main body of the protruding portion in the embodiment. [Figure 10] 3A and 3B are schematic diagrams illustrating the configuration of a protruding portion in the embodiment. [Figure 11] FIG. 2 is an explanatory diagram of the configuration of a route creation server and a 3D printer in an embodiment. [Figure 12] FIG. 2 is an explanatory diagram of a hardware configuration according to an embodiment. [Figure 13] FIG. 10 is a cross-sectional front view of a main part of a structure using a protruding portion in a first modified example. [Figure 14] FIG. 10 is a front view illustrating the configuration of a locking member used in a protruding portion in a first modified example. [Figure 15] FIG. 10 is a cross-sectional front view of a main part of a structure using a protruding portion in a second modified example. [Figure 16] FIG. 11 is a cross-sectional front view of a main part of a structure using a protruding portion in a third modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a specific embodiment of a structure and a method for forming the structure will be described with reference to FIGS. As shown in Fig. 1, the structure 10 of this embodiment is a skeleton part that constitutes the skeleton of a building, and includes an outer part 10b and an internal structure 15. Note that Fig. 1 does not show the striped pattern caused by lamination of the outer part.

[0010] The outer portion 10b is a hollow, substantially rectangular parallelepiped outer body having long sides 11 and 13 and short sides 12 and 14, and is configured as a frame having a substantially rectangular horizontal cross section. In this embodiment, the long side 11 corresponds to the first wall, and the long side 13 corresponds to the second wall. Each side (11-14) is configured of outer portions 11a, 12a, 13a, and 14a and inner portions 11b, 12b, 13b, and 14b. The outer portions 11a-14a have the same width as the inner portions 11b-14b and are arranged outside the inner portions 11b-14b in contact with them. The outer portion 10b is formed by layering stackable, hardenable mortar (cement-based material) using a three-dimensional (3D) printer.

[0011] The internal structure 15 is a member having a higher strength than the external portion 10b, and is made of, for example, a cement-based material (fiber-reinforced concrete material) mixed with fibers, such as Slimcrete (registered trademark). The internal structure 15 is integrated with the external portion 10b in a state where it is filled in the space S1 formed inside the external portion 10b.

[0012] 2 is a perspective view of the structure 10, omitting the internal structure 15 and showing the sides (11-14) with imaginary lines, illustrating the arrangement of the protruding shape portion (separator 20) in the space S1. The separator 20 is a connecting portion that connects any wall portion to another wall portion.

[0013] Moreover, Fig. 3 is an enlarged cross-sectional view taken along the center line of separator 20 shown in Fig. 2. In Fig. 3, the striped pattern caused by lamination of the outer shape of short side portion 12 that can be seen between inner portions 11b and 13b is omitted. 4 to 9 are plan cross-sectional views showing the shape of the mortar portion of each layer in the vicinity of the portion where four separators 20 are formed. Hatching indicating cross sections is omitted in these Figs.

[0014] 2, a plurality of separators 20 are provided in the space S1 of the structure 10, bridging the long side portions 11, 13. In this embodiment, for example, four separators 20 are arranged at approximately equal intervals in the horizontal direction in the upper and lower rows, and three separators 20 are arranged in the middle row between the upper and lower separators 20. Each separator 20 is arranged in a portion of the long side portions 11, 13 where the lateral pressure is high (a portion that is likely to bulge outward when the material constituting the internal structure 15 is injected into the space S1).

[0015] As shown in FIG. 4, the mortar portion L1 of the layer not forming the separator 20 is formed in a single stroke so that the linear outer portions 11a to 14a and the linear inner portions 11b to 14b come into contact with each other.

[0016] As shown in FIG. 3, each separator 20 includes a support portion 21 and a main body portion 25 supported by the support portion 21. The support portion 21 is formed by stacking portions of the mortar portion L1 that have the same size as the long side portions 11, 13 and that protrude inward (toward the space S1). In this case, the support portion 21 has a first protrusion formed by protruding from the long side portion 11 (13) and a second protrusion that protrudes further from the first protrusion in the layer immediately above the first protrusion. The support portion 21 is formed by stacking the first protrusion and the second protrusion, thereby stacking mortar portions L11, L12, ..., L1n whose protrusions gradually become larger toward the top. 5, protrusions 21a and 21b are formed in the mortar portion L11 of the lowest layer of the support portion 21, protruding from the long side portions 11 and 13. These protrusions 21a and 21b have a loop shape with a circular arc-shaped tip that is folded back.

[0017] As shown in FIG. 6, the mortar section L12 in the layer immediately above the bottom layer (the second layer from the bottom in the support section 21) has protruding sections 22a and 22b protruding from the long side sections 11 and 13. The protruding sections 22a and 22b extend from the long side section 11 and 13 toward the long side section 13 and then turn back, forming a loop shape that extends toward the long side section 11 and 13. The protruding sections 22a and 22b protrude further toward the space S1 (the opposing long side sections 13 and 11) than the protruding sections 21a and 21b immediately below. The protruding sections 22a and 22b are formed with a protruding amount that allows them to support the tip of the mortar layered above without dropping due to their weight. Specifically, for example, the protruding section 22a and 22b are formed so that a portion of the folded-back portion of the arc at the tip of the protruding section 22a and 22b abuts a portion of the folded-back portion at the tip of the protruding section 21a and 22b immediately below. Therefore, in this example, protrusions 21a and 21b correspond to the first protrusions, and protrusions 22a and 22b correspond to the second protrusions. Note that, in the protrusions in the layer immediately above protrusions 22a and 22b, these protrusions correspond to the second protrusions, and protrusions 22a and 22b immediately below them correspond to the first protrusions.

[0018] 7, in the mortar portion L1n of the top layer of the support portion 21, the tips of the protruding portions 24a and 24b protruding from the long side portions 11 and 13 are formed to abut against each other. In this case, the protruding portion 24a (24b) is configured in a loop shape similar to the protruding portion 22a (22b). The protruding portion 24a (24b) corresponds to the second protruding portion, and the protruding portion directly below the protruding portion 24a (24b) corresponds to the first protruding portion.

[0019] As shown in FIG. 3, the main body 25 of the separator 20 is formed by alternately stacking three mortar sections L21 and three mortar sections L22. 8, the mortar portion L21 has a loop-shaped portion 27 that protrudes from the long side portion 13 toward the long side portion 11. The loop-shaped portion 27 extends from the long side portion 13 toward the long side portion 11, and has a loop shape in which its tip abuts against the inner portion 11b of the long side portion 11, folds back in an arc, and extends toward the long side portion 13.

[0020] 9, the mortar portion L22 has a shape in which the long sides 11 and 13 of the mortar portion L21 are reversed. Specifically, the mortar portion L22 has a loop-shaped portion 28 that extends from the long side 11 toward the long side 13, and has a tip that abuts against the inner side 13b of the long side 13, turns back in an arc, and extends toward the long side 11.

[0021] 10, main body 25 is configured with a number of layers that provides a contact area A1 that can withstand lateral pressure P1 applied to the side surfaces of long sides 11 and 13 by the material injected into space S1. Note that support portion 21 has protruding portions whose protruding length gradually increases upward, and is configured so that, for example, the tip of the protruding portion protrudes at an inclination angle θ1 to support main body 25.

[0022] (Configuration of 3D printer 40 and creation support server 60) Next, the 3D printer 40 and the creation support server 60 that form the outer portion 10b of the structure 10 described above will be described with reference to FIGS.

[0023] (Example of hardware configuration) FIG. 11 shows an example of the hardware configuration of an information processing device H10 that functions as the control device 50 of the 3D printer 40, the creation support server 60, and the like.

[0024] The information processing device H10 includes a communication device H11, an input device H12, a display device H13, a storage device H14, and a processor H15. Note that this hardware configuration is an example, and the information processing device H10 may include other hardware.

[0025] The communication device H11 is an interface that establishes a communication path with another device and executes data transmission and reception, and is, for example, a network interface or a wireless interface.

[0026] The input device H12 is a device that accepts input from a user, etc., and is, for example, a mouse, a keyboard, etc. The display device H13 is a display, a touch panel, etc. that displays various information.

[0027] The storage device H14 is a storage unit (for example, a discharge path storage unit 62 described later) that stores data and various programs for executing various functions of the control device 50 and the production support server 60. Examples of the storage device H14 include a ROM, a RAM, a hard disk, etc.

[0028] The processor H15 uses programs and data stored in the storage device H14 to control various processes (e.g., processes in the control units 51 and 61 described below) in the user terminal (not shown), the control device 50, and the creation support server 60. Examples of the processor H15 include a CPU and an MPU. The processor H15 loads programs stored in a ROM or the like into a RAM and executes various processes corresponding to the various processes. For example, when an application program in the control device 50 or the creation support server 60 is started, the processor H15 operates a process that executes the various processes described below.

[0029] The processor H15 is not limited to a processor that performs all of its processing using software. For example, the processor H15 may include a dedicated hardware circuit (e.g., an application-specific integrated circuit (ASIC)) that performs hardware processing for at least some of the processing it performs. That is, the processor H15 may be configured with the following:

[0030] (1) One or more processors operating according to a computer program (software) (2) One or more dedicated hardware circuits that perform at least some of the processes; or (3) Circuits, including combinations thereof

[0031] The processor includes a CPU and memory, such as RAM and ROM, that stores program code or instructions configured to cause the CPU to perform processes. Memory, or computer-readable media, includes any available media that can be accessed by a general-purpose or special-purpose computer.

[0032] (3D Printer 40 Features) The 3D printer 40 of this embodiment shown in FIG. 11 includes a nozzle 41 as a discharge unit, a robot arm 45, and a control device 50.

[0033] The nozzle 41 has a tip that is tapered and has an open discharge port 41a. In this embodiment, the discharge port 41a faces downward. An end of a hose 42 is connected to the end of the nozzle 41 opposite the discharge port 41a. The hose 42 is connected to a pressure pump (not shown). Due to the pressure of this pressure pump, mortar supplied to the nozzle 41 via the hose 42 is discharged downward from the discharge port 41a.

[0034] A robot arm 45 is attached to the nozzle 41 via an attachment part 44. The nozzle 41 is supported by the robot arm 45 and moves horizontally and vertically in accordance with the movement of the robot arm 45. The movement of the robot arm 45 is controlled by instructions from a control part 51 of the control device 50. The control part 51 of this embodiment controls the robot arm 45 so that the direction of mortar discharge from the nozzle 41 is always downward even during movement.

[0035] The control device 50 includes a control unit 51 that executes a structure formation process. Therefore, by executing a structure formation program stored in the storage unit, the control unit 51 functions as a stacking management unit 511, a movement control unit 512, and a discharge amount control unit 513.

[0036] The layer stacking management unit 511 executes a process for managing the path and height of the mortar to be stacked in order to form the structure 10. The layer stacking management unit 511 counts the number of stacked layers, stores the current number of mortar layers, and stops the movement of the nozzle 41 when the final number of layers of the structure 10 is reached.

[0037] The movement control unit 512 executes a process for controlling the movement of the robot arm 45 that moves the nozzle 41 according to the path. The discharge amount control unit 513 controls a pump that pressure-feeds the mortar, and executes a process of controlling the amount of mortar discharged from the nozzle 41.

[0038] (Configuration of creation support server 60) Next, the configuration of the creation support server 60 as the creation support system will be described. The creation support server 60 is a computer terminal that determines the movement path of the nozzle 41. The creation support server 60 includes a control unit 61 and a discharge path storage unit 62. The creation support server 60 is connected to the control device 50 of the 3D printer 40.

[0039] The control unit 61 functions as a separator forming unit 611 and a path creating unit 612 by executing a path determination program stored in the storage unit. The separator forming unit 611 stores the shape of the separator 20. When the separator forming unit 611 acquires information on the installation location of the separator 20, the separator forming unit 611 generates an updated shape by adding the support portion 21 and main body portion 25 of the separator 20 to the structure to be formed.

[0040] The path creation unit 612 creates a path in one stroke to form the outer portion 10b of the structure 10. In this embodiment, to form the outer portion 10b, the path creation unit 612 uses half the width of the outer portion 10b to generate a double path in which the long side portions 11, 13 and the short side portions 12, 14 are connected in two in the width direction.

[0041] The discharge path storage unit 62 stores path data of the nozzle 41 that forms the outer portion 10b of the structure 10. This path data is stored when a unicursal path is created by the path creation unit 612. The path data includes data related to the path according to the structure identifier, the discharge width, and the number of layers.

[0042] In the structure identifier data area, data relating to an identifier for identifying each structure 10 is recorded. In the discharge width data area, data for specifying the width of the mortar discharged from the nozzle 41 to form this structure 10 is recorded. In the path data area according to the number of layers, the path of the nozzle 41 of the 3D printer 40 in each layer is stored in association with the number of layers in order to form this structure 10.

[0043] (Method of forming structure 10) Next, a method for forming the structure 10 will be described. In response to a user's instruction, a control unit 61 of a production support server 60 shown in FIG. 11 acquires information on the shape of the structure to be formed as well as information on the installation location of the separator 20 in the structure.

[0044] Then, the control unit 61 generates an updated shape of the structure provided with the separator 20. Specifically, the separator forming unit 611 of the control unit 61 uses the stored shape (configuration) of the separator 20 to arrange the separator 20 corresponding to the installation location in the structure to be formed. In this case, the size of the separator 20 (number of layers and length) is adjusted to correspond to the distance between the long side portions 11, 13 of the installation location and the lateral pressure to be applied. Then, the separator forming unit 611 generates a new shape (updated shape) by adding the separator 20 arranged at the installation location to the shape of the structure.

[0045] Next, the path creation unit 612 of the control unit 61 uses the generated updated shape to create a path for the nozzle 41 that discharges mortar for each layer, and stores the path data in association with the number of layers. Thereafter, the control unit 61 of the creation support server 60 transmits the path data to the control device 50 of the 3D printer 40 before forming the structure 10. The control unit 51 of the control device 50 stores the acquired path data.

[0046] The 3D printer 40 then executes a layer formation process in accordance with the control unit 51 of the control device 50. Specifically, the layer management unit 511 of the control unit 51 controls the movement control unit 512 and the discharge amount control unit 513. The movement control unit 512 then moves the robot arm 45 while discharging mortar from the nozzle 41. In this case, the discharge amount control unit 513 of the control unit 51 adjusts the discharge amount from the pump and the movement speed of the nozzle 41 so that the mortar will have a discharge width according to the path data. The layer management unit 511 of the control unit 51 then moves the nozzle 41 along a path (a single-stroke path with the same start and end points) for each layer of the path data.

[0047] In this case, as shown in Fig. 4, in the layer where the separator 20 is not formed, the mortar section L1 is formed in a single stroke. Then, this mortar section L1 is laminated. 5 to 7, in the layer where the support portion 21 of the separator 20 is formed, the mortar portions L11, L12, ..., L1n are formed and stacked along a single path where the start and end points of the mortar portion L1 are the same. As a result, the support portion 21 is formed, which has protruding portions (21a to 24a, 21b to 24b) that become larger as they go upward and are integrated with the long side portions 11 and 13.

[0048] 8 and 9, in the bottom layer where the main body portion 25 of the separator 20 is formed, a mortar portion L21 is formed in a single stroke, with the start and end points of the mortar portion L1 being the same. This mortar portion L21 is formed by overlapping it on the protruding portions 24a, 24b of the top layer of the support portion 21. Thereafter, the main body portion 25 is formed by alternately stacking the mortar portions L21, L22 in a single stroke, with the start and end points of the mortar portion L1 being the same.

[0049] After the outer portion 10b is completed, the outer portion 10b is used as a formwork to fill the space S1 with fiber reinforced concrete material. As a result, the plurality of separators 20 shown in FIG. 2 are filled with the fiber concrete material. Thereafter, as the fiber reinforced concrete material hardens, the inner structural body 15 is integrated with the outer portion 10b, and the structure 10 is completed.

[0050] (action) In this embodiment, the separator 20, which protrudes from and connects the long sides 11, 13 of the structure 10, is formed by laminating mortar. In this case, the support portion 21 of the separator 20 has protruding portions 21a, 21b formed protruding from the long sides 11 (13) and protruding portions 22a, 22b. The protruding portions 22a, 22b protrude further from the protruding portions 21a, 21b in the layer immediately above the protruding portions 21a, 21b. As a result, the main body portion 25 of the separator 20 is supported by the support portion 21, which is formed by laminating mortar.

[0051] According to this embodiment, the following effects can be obtained. (1) In this embodiment, the separator 20, which resists lateral pressure, is formed by laminating mortar between the long side portions 11, 13. This allows the separator 20 to be formed simultaneously with the formation of the long side portions 11, 13 and the short side portions 12, 14 of the structure 10, thereby efficiently forming a structure that suppresses damage due to lateral pressure.

[0052] (2) In this embodiment, the separator 20 includes a main body portion 25 and a support portion 21 that supports the main body portion 25. The support portion 21 includes protrusions (21a to 24a, 21b to 24b) whose protrusion length increases as the support portion 21 is stacked upward. This allows the main body portion 25 to be supported with a simple configuration, thereby preventing the main body portion 25 from falling due to gravity when forming mortar. Therefore, a structure 10 with a desired shape can be formed.

[0053] (3) In this embodiment, the main body 25 of the separator 20 is configured with a number of layers corresponding to the contact area A1 that resists lateral pressure. This makes it possible to sufficiently suppress lateral pressure on the long side portions 11, 13. Furthermore, because the main body 25 is configured by alternately stacking mortar portions L21, L22 of different shapes, it is possible to suppress the occurrence of joints in the height direction at the contact portions between the long side portions 11, 13 and the loop-shaped portions 27, 28.

[0054] (4) In this embodiment, the control unit 61 of the creation support server 60 generates an updated shape by adding the separator 20 to the shape of the structure 10 corresponding to the acquired installation location, and generates a path for each layer using this updated shape. This allows for efficient formation of a structure with a shape in which the separator 20 is installed by specifying the location where lateral pressure should be taken into consideration.

[0055] (5) The structure 10 of this embodiment is formed by discharging mortar while moving the nozzle 41 along a path in which the start and end points of each layer are the same. This allows the structure 10 to be formed without stopping the discharging of mortar, and therefore the outer portion 10b including the separator 20 can be formed efficiently.

[0056] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. In the above embodiment, the main body 25 of the separator 20 is formed by alternately stacking mortar portions L21 having loop-shaped portions 27 protruding from the long side 11 and mortar portions L22 having loop-shaped portions 28 protruding from the long side 13. The configuration of the main body 25 is not limited to this, and only the mortar portions L21 (L22) protruding from one wall may be stacked, or several layers may be stacked alternately. Furthermore, mortar portions may be stacked such that the tips of the loop-shaped portions protruding from both the long side 11 and 13 abut at the center of the space S1.

[0057] In the above embodiment, the main body 25 of the separator 20 is connected at two locations on the opposing long sides 11, 13. The number of connecting locations is not limited to two, and more locations may be connected. For example, when connecting three locations, a structure may be formed by stacking mortar sections, each having a connecting portion connecting two of the three locations, in order.

[0058] In the above embodiment, the separator 20 is formed only by laminating mortar. However, the main body 25 of the separator 20 may be formed not only by laminating mortar but also by other members. For example, in the structure 70 shown in FIG. 13, the main body 75 of the separator 20 is made up of two layers, one each of mortar portions L21 and L22, and a metal locking member 80.

[0059] 14, locking member 80 has a shape in which engaging portions 83, 84 protruding upward and downward are provided at both ends of horizontally extending shaft portion 81. Note that locking member 80 is not limited to this shape or material, and may be any member that can reinforce the force against lateral pressure when embedded between laminated members.

[0060] 13, the locking member 80 is embedded between the mortar portions L21, L22 of the main body portion 75. As a result, the engagement portions 83, 84 of the locking member 80 lock the mortar portions L21, L22. Therefore, even if the layers of the mortar portion that form the main body portion 75 cannot be stacked high and the contact area A1 is small, the locking member 80 can resist lateral pressure.

[0061] Furthermore, the position of the locking member 80 is not limited to the case where it is provided in the center of the mortar portion. For example, when mortar parts L22 of the same configuration are stacked, as in the main body part 76 of the structure 71 shown in Figure 15, a locking member 80 may be provided between the tip of the mortar part L22 and the inner part 13b of the long side part 13 that contacts it.

[0062] 16 is formed by laminating mortar portions L23 each having a shape in which the tips of loop-shaped portions 79a, 79b protruding from both long side portions 11, 13 abut at the center of space S1. In this case, a locking member 80 may be provided between loop-shaped portions 79a, 79b.

[0063] In the above embodiment, the support portion 21 of the structure 10 has protruding portions (21a to 24a, 21b to 24b) that gradually protrude from both of the long side portions 11, 13. The configuration of the support portion is not limited to this. For example, the support portion may be configured with only a protruding portion that gradually protrudes from one of the long side portions 11 (13). Furthermore, the support portion 21 in the above embodiment has an overall shape of two right-angled triangles lined up side by side. The overall shape of the support portion is not limited to a triangle as long as it has a first protrusion formed by protruding from the wall portion and a second protrusion that further protrudes from the first protrusion immediately above the first protrusion. For example, the support portion may have a shape in which one side of the right-angled triangle is curved upward or downward, or may have an overall shape with a bent straight line whose inclination angle changes midway.

[0064] In the above embodiment, the support portion 21 of the separator 20 has the protruding portions (21a to 24a, 21b to 24b) protruding in the same direction. This protruding direction may be changed for each story. For example, the protruding portions may protrude in a direction other than 90 degrees from the first wall portion. In this case, the second protruding portion may be formed to protrude in a diagonal direction toward the second wall portion more than the first protruding portion.

[0065] In the above embodiment, the structure 10 has been described as having a separator 20 that resists the lateral pressure of the fiber concrete material poured into the space S1 formed by the outer portion 10b. However, the structure may have a protruding portion that protrudes from the wall portion, and is not intended to resist lateral pressure. For example, in the case of forming a flow path in the space S1, the structure may have a protruding portion that protrudes from the long sides 11, 13 toward the space S1.

[0066] Next, the technical ideas that can be understood from the above-described embodiment and other examples will be described below. (a) The structure described in claim 2, characterized in that the main body portion has a loop-shaped portion that extends from the first wall portion toward the second wall portion, abuts the second wall portion, folds back, and extends toward the first wall portion. (b) The structure described in (a) or (b), characterized in that the main body portion is constructed by stacking the mortar in a number of layers determined according to the lateral pressure applied to the first wall portion and the second wall portion.

[0067] (c) The structure described in (a) or (b) in claim 2, characterized in that the support portion further comprises a protrusion in the layer of the first protrusion, the length of which corresponds to the first protrusion from the second wall portion, and a protrusion in the layer of the second protrusion, the length of which corresponds to the second protrusion, by stacking the mortar. (d) A structure as described in any one of (a) to (c) and (2), characterized in that the mortar portion further comprises a locking member that connects the first wall portion and the second wall portion. [Explanation of symbols]

[0068] θ1...angle, A1...contact area, L1, L11, L12, L1n, L21, L22, L23...mortar portion, P1...lateral pressure, S1...space, 10, 70, 71, 72...structure, 10b...outer portion, 11, 13...long side portion, 11a, 12a, 13a, 14a...outer portion, 11b, 12b, 13b, 14b...inner portion, 12, 14...short side portion, 15...internal structure, 20...separator as protruding portion, 21...support portion, 21a, 21b...protruding portion as first protruding portion, 22a, 22b...protruding portion as first protruding portion and second protruding portion, 24 a, 24b...protrusion as second protrusion, 25, 75, 76, 77...main body, 27, 28, 79a, 79b...loop-shaped portion, 40...3D printer, 41...nozzle, 41a...discharge outlet, 42...hose, 44...mounting portion, 45...robot arm, 50...control device, 51...control unit, 60...creation support server, 61...control unit, 62...discharge path memory unit, 80...locking member, 81...shaft portion, 83, 84...engagement portion, 511...stacking management unit, 512...movement control unit, 513...discharge amount control unit, 611...separator forming unit, 612...path creation unit.

Claims

1. A structure comprising an outer body formed by laminating a first mortar and having a wall portion with a protruding shape, and an inner structure formed inside the outer body and made of a second mortar that constitutes a member having higher strength than the first mortar, The protruding portion is a support portion formed by laminating the first mortar and protruding from the wall portion; a main body portion formed by laminating the first mortar and supported by the support portion; the support portion has a first protruding portion formed to protrude from the wall portion, and a second protruding portion further protruding from the first protruding portion in a layer immediately above the first protruding portion, the first protruding portion is formed with a protruding amount that can support the tip of the first mortar of the second protruding portion without dropping due to its weight, A structure characterized in that the main body portion is connected to an opposing portion of the external formation body so as to resist lateral pressure applied to the side of the external formation body by the material filled inside the external formation body.

2. The wall portion has a first wall portion and a second wall portion disposed opposite to each other, 2. The structure according to claim 1, wherein the protruding portion is a connecting portion having the main body portion that connects the first wall portion and the second wall portion.

3. A method for forming a structure comprising an outer formed body having a wall portion with a protruding shape formed by stacking first mortar by discharging the first mortar from a nozzle while moving the nozzle, and an inner structure formed inside the outer formed body and made of a second mortar that constitutes a member having higher strength than the first mortar, the protruding portion includes a support portion and a main body portion supported by the support portion, a first protruding portion formed to protrude from the wall portion, the first mortar being ejected in an amount that allows a tip of the first mortar to form a second protruding portion that further protrudes from the first protruding portion in a layer immediately above the first protruding portion to be supported without dropping due to its weight, and the second protruding portion is formed by ejecting the first mortar to form the support portion; A method for forming a structure, characterized in that after the support portion is formed, the first mortar is ejected onto the support portion to form the main body portion, which is connected to the opposing part of the external formation body so as to resist the lateral pressure applied to the side of the external formation body by the material filled inside the external formation body.

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