JP7793945B2 - Structure and method for forming the structure - Google Patents

Description

The present invention relates to a structure formed by layering mortar dispensed from a moving nozzle, and a method for forming such a structure.

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 explored (see, for example, Patent Document 1). The structure described in this document comprises an outer body with 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 composed of a second mortar that forms a stronger member than the first mortar that forms the outer body.

When the second mortar is injected into the frame formed by layering the first mortar, the injected second mortar applies pressure (lateral pressure) to the side 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 to withstand the lateral pressure with a simple structure has been investigated (see, for example, Patent Document 2). In the technology described in this document, metal separators (connecting members) with their ends placed on top of outer and inner frames formed to a predetermined height by layering mortar using a 3D printer are then placed on top of the outer and inner frames. Further mortar is then layered on top of the separators to form the outer and inner frames, after which the second mortar is injected. This embeds the center of the separator in the second mortar.

Japanese Patent Application Laid-Open No. 2020-026686 Japanese Patent Application Laid-Open No. 2021-062488

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 layer the separators. This required a lot of effort and expense, making it difficult to efficiently form structures.

A structure that solves the above problem is a structure comprising an outer forming body having a wall portion formed by stacking first mortar and having a protruding portion , and an internal structure formed inside the outer forming body and made of a second mortar that constitutes a member with higher strength than the first mortar , wherein the protruding portion comprises a support portion formed by stacking the first mortar and protruding from the wall portion, and a main body portion formed by stacking the first mortar and supported by the support portion, wherein the support portion has a first protruding portion formed by stacking the first mortar and protruding further from the first protruding portion in the layer immediately above the first protruding portion , wherein 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 it dropping due to its weight, and the main body portion is configured to be connected to an opposing portion of the outer forming body so as to resist the lateral pressure applied to the side of the outer forming body by the material filled inside the outer forming body .

The present invention allows structures to be formed efficiently.

FIG. 2 is a perspective view of a structure according to an embodiment. FIG. 2 is a perspective view showing the arrangement of protruding portions of a structure in the embodiment. FIG. 2 is a cross-sectional front view of a main part of the structure according to the embodiment. 10A and 10B are explanatory views illustrating mortar portions in portions other than the protruding portion in the embodiment. 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. 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. 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. FIG. 10 is an explanatory diagram of a first mortar layer of the main body of the protruding portion in the embodiment. FIG. 10 is an explanatory diagram of a second mortar layer of the main body of the protruding portion in the embodiment. 3A and 3B are schematic diagrams illustrating the configuration of a protruding portion in the embodiment. FIG. 2 is an explanatory diagram of the configuration of a path creation server and a 3D printer according to an embodiment. FIG. 2 is an explanatory diagram of a hardware configuration according to an embodiment. FIG. 10 is a cross-sectional front view of a main part of a structure using a protruding portion in a first modified example. FIG. 10 is a front view illustrating the configuration of a locking member used in a protruding portion in a first modified example. FIG. 11 is a cross-sectional front view of a main part of a structure using a protruding portion in a second modified example. FIG. 11 is a cross-sectional front view of a main part of a structure using a protruding portion in a third modified example.

Hereinafter, a structure and a method for forming the structure will be described with reference to FIGS. 1 to 12. FIG.
As shown in Fig. 1, the structure 10 of this embodiment is a skeleton portion that constitutes the skeleton of a building, and includes an outer portion 10b and an internal structure 15. Note that Fig. 1 omits the striped pattern caused by lamination of the outer portion.

The outer portion 10b is a hollow, approximately rectangular parallelepiped outer body, configured as a frame with a substantially rectangular horizontal cross section having long sides 11, 13 and short sides 12, 14. 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 composed of outer portions 11a, 12a, 13a, 14a and inner portions 11b, 12b, 13b, 14b. The outer portions 11a-14a have the same width as the inner portions 11b-14b and are aligned outside the inner portions 11b-14b, abutting them. The outer portion 10b is formed by layering layerable, hardenable mortar (cement-based material) using a three-dimensional (3D) printer.

The internal structure 15 is a member with higher strength than the external portion 10b, and is composed of 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 by filling the space S1 formed inside the external portion 10b.

Figure 2 is a perspective view of the structure 10, omitting the internal structure 15 and showing each side (11-14) with virtual lines, illustrating the arrangement of the protruding shape portion (separator 20) within the space S1. This separator 20 is a connecting portion that connects any wall portion to another wall portion.

3 is an enlarged cross-sectional view taken along the center line of the separator 20 shown in FIG. 3. In FIG. 3, the striped pattern caused by lamination of the outer shape of the short side portion 12, which can be seen between the 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 figures.

As shown in FIG. 2, multiple separators 20 are provided within the space S1 of the structure 10, bridging the long sides 11, 13. In this embodiment, for example, four separators 20 are arranged at approximately equal intervals in the horizontal direction on the upper and lower tiers, and three separators 20 are arranged in the middle tier, positioned between the upper and lower separators 20. Each separator 20 is arranged in a portion of the long sides 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).

As shown in Figure 4, the mortar section L1 of the layer that does not form the separator 20 is formed in a single stroke so that the linear outer sections 11a-14a and inner sections 11b-14b abut each other.

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 and 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 and second protrusions, thereby stacking mortar portions L11, L12, ..., L1n, whose protrusions gradually become larger toward the top.
Specifically, as shown in Fig. 5, protrusions 21a and 21b are formed in the mortar portion L11 of the bottom 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.

As shown in Figure 6, in the mortar section L12 in the layer immediately above the bottom layer (the second layer from the bottom in the support section 21), protrusions 22a and 22b are formed that protrude from the long sides 11 and 13. These protrusions 22a (22b) are configured in a loop shape, extending from the long side 11 (13) toward the long side 13 (11), folding back, and then extending toward the long side 11 (13). Protrusions 22a and 22b protrude further toward the space S1 side (the opposing long sides 13 and 11) than the protrusions 21a and 21b directly below them. Here, protrusions 22a and 22b are formed to a protrusion amount that can support the tip of the mortar layered above without dropping due to its weight. Specifically, for example, protrusion 22a (22b) is formed so that part of the arc-shaped folded portion at its tip abuts part of the folded portion at the tip of protrusion 21a (22b) directly below. Therefore, here, protrusions 21a and 21b correspond to the first protrusions, and protrusions 22a and 22b correspond to the second protrusions. Note that for the protrusions in the layer directly above protrusions 22a and 22b, these protrusions correspond to the second protrusions, and the protrusions 22a and 22b directly below them correspond to the first protrusions.

As shown in Figure 7, in the mortar section L1n of the top layer of the support section 21, the tips of the protrusions 24a and 24b protruding from the long side sections 11 and 13 are formed to abut against each other. In this case, the protrusions 24a (24b) are configured in a loop shape similar to the protrusions 22a (22b). Note that the protrusions 24a (24b) correspond to the second protrusions, and the protrusion directly below the protrusions 24a (24b) corresponds to the first protrusions.

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 the tip abuts against the inner portion 11b of the long side portion 11, folds back in an arc shape, and extends toward the long side portion 13.

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

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

(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. 11 and 12. FIG.

(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.

The information processing device H10 has 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 other hardware may be included.

The communication device H11 is an interface that establishes a communication path with other devices and transmits and receives data, such as a network interface or a wireless interface.

The input device H12 is a device that accepts input from a user, etc., such as a mouse or keyboard. The display device H13 is a display or touch panel that displays various information.

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

Processor H15 uses programs and data stored in storage device H14 to control each process (e.g., the processes in control units 51 and 61 described below) in the user terminal (not shown), control device 50, and creation support server 60. Examples of processor H15 include a CPU and an MPU. Processor H15 loads programs stored in ROM, etc., into RAM and executes various processes corresponding to the various processes. For example, when application programs in control device 50 and creation support server 60 are launched, processor H15 runs processes that execute each process described below.

Processor H15 is not limited to performing all of the processing it executes using software. For example, processor H15 may be equipped with a dedicated hardware circuit (e.g., an application-specific integrated circuit (ASIC)) that performs hardware processing for at least some of the processing it executes. In other words, processor H15 may be configured as follows:

(1) One or more processors that operate according to a computer program (software), (2) One or more dedicated hardware circuits that perform at least some of the various processes, or (3) A circuit that includes a combination of these.

A 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.

(Functions of 3D printer 40)
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.

The nozzle 41 has a tapered tip and an open discharge port 41a. In this embodiment, the discharge port 41a faces downward. The end of the nozzle 41 opposite the discharge port 41a is connected to the end of the nozzle 41. 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.

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 the control part 51 of the control device 50. In this embodiment, the control part 51 controls the robot arm 45 so that the mortar is always discharged downward from the nozzle 41 even when the robot arm 45 is moving.

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

The layering management unit 511 executes a process to manage the path and height of the mortar to be layered in order to form the structure 10. The layering management unit 511 counts the number of layers that have been layered, stores the current number of mortar layers, and stops the movement of the nozzle 41 when the final number of layers for the structure 10 has been reached.

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 .

(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.

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.

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 that connects the long side portions 11, 13 and the short side portions 12, 14 in the width direction.

The discharge path memory unit 62 records path data for the nozzle 41 that forms the outer portion 10b of the structure 10. This path data is recorded 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, discharge width, and number of layers.

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 on each layer is stored in association with the number of layers in order to form this structure 10.

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

The control unit 61 then generates an updated shape of the structure in which the separators 20 are provided. Specifically, the separator forming unit 611 of the control unit 61 uses the stored shape (configuration) of the separators 20 to place the separators 20 in accordance with the installation locations in the structure to be formed. In this case, the size of the separators 20 (number of stacks and length) is adjusted to correspond to the distance between the long sides 11, 13 at the installation locations and the applied lateral pressure. The separator forming unit 611 then generates a new shape (updated shape) by adding the separators 20 placed in the installation locations to the shape of the structure.

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.

The 3D printer 40 then executes the 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 is discharged to the discharge width specified in the path data. The layer management unit 511 of the control unit 51 then moves the nozzle 41 along the path for each level of the path data (a single-stroke path with the same start and end points).

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. This forms the support portion 21 that 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.

Then, as shown in Figures 8 and 9, in the bottom layer where the main body portion 25 of the separator 20 is formed, mortar portion L21 is formed in a single stroke, with the start and end points of 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. The main body portion 25 is then formed by alternately stacking mortar portions L21, L22 in a single stroke, with the start and end points of mortar portion L1 being the same.

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 structure 15 is integrated with the outer portion 10b, and the structure 10 is completed.

(effect)
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.

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.

(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-24a, 21b-24b) whose protrusion length increases as the support portion 21 is stacked upward. This allows for a simple configuration to support the main body portion 25, preventing the main body portion 25 from falling due to gravity when forming mortar. This makes it possible to form a structure 10 with the desired shape.

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

(4) In this embodiment, the control unit 61 of the creation support server 60 generates an updated shape by adding separators 20 to the shape of the structure 10 corresponding to the acquired installation locations, and uses this updated shape to generate paths for each layer. This allows for efficient formation of a structure with a shape in which separators 20 are installed by specifying locations where lateral pressure should be taken into consideration.

(5) The structure 10 of this embodiment is formed by discharging mortar while moving the nozzle 41 along a path whose starting and ending points are the same for each layer. This allows the structure 10 to be formed without stopping the discharging of mortar, thereby efficiently forming the outer portion 10b including the separator 20.

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 the long side 13 abut at the center of the space S1.

- 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, if three locations are connected, the structure may be constructed by stacking mortar sections, each having a connecting portion connecting two of the three locations, in order.

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 a structure 70 shown in FIG. 13, a main body 75 of a separator 20 is made up of two layers, one each of mortar portions L21 and L22, and a metal locking member 80.

As shown in Figure 14, the locking member 80 has a shape in which engaging portions 83, 84 protrude upward and downward from both ends of a horizontally extending shaft portion 81. Note that the locking member 80 is not limited to this shape or material, and may be any member that can reinforce the force required to resist lateral pressure when embedded between laminated members.

Then, as shown in Figure 13, the locking member 80 is embedded between the mortar sections L21 and L22 of the main body section 75. As a result, the engaging sections 83 and 84 of the locking member 80 lock the mortar sections L21 and L22. Therefore, even if the mortar sections that form the main body section 75 cannot be stacked high and the contact area A1 is small, the locking member 80 can resist lateral pressure.

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

Furthermore, the main body 77 of the structure 72 shown in Figure 16 is constructed by laminating mortar sections L23 in a shape in which the tips of loop-shaped sections 79a and 79b protruding from both long side sections 11 and 13 abut in the center of the space S1. In this case, a locking member 80 may be provided between the loop-shaped sections 79a and 79b.

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 arranged 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 to protrude from the wall portion and a second protrusion that protrudes further 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.

- In the above embodiment, the support portion 21 of the separator 20 has protruding portions (21a to 24a, 21b to 24b) protruding in the same direction. This protruding direction may be changed for each floor. For example, the protruding portions may protrude in a direction other than 90 degrees relative to 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.

- In the above embodiment, the structure 10 was 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. The structure may be a structure that is not designed to resist lateral pressure, as long as it has a protruding portion that protrudes from the wall. For example, if a flow path is formed in the space S1, the structure may have a protruding portion that protrudes from the long sides 11, 13 toward the space S1.

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.

(c) A structure as 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 protrusion having a length from the second wall portion corresponding to the first protrusion, and a protrusion in the layer of the second protrusion, the length corresponding to the second protrusion, by stacking the mortar.
(d) A structure described in any one of (a) to (c) and (2), characterized in that the mortar portion further comprises a locking member connecting the first wall portion and the second wall portion.

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...external 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...controller, 60...creation support server, 61...controller, 62...discharge path storage unit, 80...locking member, 81...shaft, 83, 84...engagement portion, 511...stacking management unit, 512...movement control unit, 513...discharge amount control unit, 611...separator formation unit, 612...path creation unit.

Claims (3)

A structure comprising an outer formation body having a wall portion formed by stacking first mortar and having a protruding portion , and an inner structure formed inside the outer formation body and made of second mortar constituting a member having a 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 . 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. A method for forming a structure comprising: an outer body having a wall portion with a protruding shape portion, the outer body being formed by stacking first mortar by discharging the first mortar from a nozzle and moving the nozzle; and an inner structure formed inside the outer body and made of a second mortar that constitutes a member having a 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 .