Construction methods for the foundations of structures

Abstract

This method for constructing a foundation of a structure having a footing and a pedestal includes: a mold forming step for using a 3D printer to form, from concrete or mortar, a mold to serve as an integral mold of the footing and the pedestal; and a filling step for filling concrete into the mold, wherein the mold has a shape, the horizontal cross-sectional area of which decreases from the footing side toward the pedestal side.

Description

Technical Field

[0001] The present invention relates to a method for constructing the foundation of a structure.

Background Art

[0002] At sites such as resource development and plant construction, it is necessary to construct various structures. Since the construction of structures such as buildings requires a large initial investment and a long construction period, it also has a great impact on the overall development. In addition, structures may be constructed in mountainous areas or wilderness far from urban areas, which not only requires costs and time for the transportation of workers and materials, but it may also not be easy to secure skilled workers. Therefore, improvements such as shortening the construction period, labor saving, and quality stability are demanded.

[0003] For example, Patent Document 1 describes a construction method in which concrete is extruded from an additive manufacturing device around a reinforcing bar to form a mortar frame, and further, a concrete core is formed inside the mortar frame.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to the proposal of Patent Document 1, when constructing a reinforced concrete structure such as a pier, by using a fiber-reinforced mortar frame as a formwork, it is suggested that even if the formwork is integrated with the concrete core without being disassembled, the seismic resistance and recoverability are improved. However, regarding the foundation of a structure, no particular proposal or suggestion has been shown.

[0006] An object of the present invention is to provide a method for constructing the foundation of a structure that can achieve improvements such as shortening the construction period, labor saving, and quality stability when constructing the foundation of a structure. [Means for solving the problem]

[0007] A first aspect of the present invention is a method for constructing the foundation of a structure having a footing and a pedestal, comprising: a formwork forming step of forming a formwork that will be an integrated formwork for the footing and the pedestal from concrete or mortar using a 3D printer; and a filling step of filling the inside of the formwork with concrete, wherein the formwork has a shape in which the horizontal cross-sectional area decreases from the footing side toward the pedestal side.

[0008] A second aspect of the present invention is characterized in that, in the first aspect, the concrete is filled using a 3D printer in the filling step.

[0009] A third aspect of the present invention, in the first or second aspect, is characterized in that, prior to the formwork formation step, a reinforcing bar placement step is made for arranging the reinforcing bars of the footing and the pedestal, and in the filling step, the reinforcing bars are embedded in the concrete that is filled inside the formwork.

[0010] A fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, a joining member is installed prior to the filling step, which allows a structure to be placed above the pedestal to be joined by anchor bolts or welding, and in the filling step, a part of the joining member is embedded in the concrete that is filled inside the formwork.

[0011] A fifth aspect of the present invention is characterized in that, in any one of the first to fourth aspects, the invention comprises a formwork embedding step of pouring an embedding material around the formwork and embedding at least a portion of the formwork in the embedding material.

[0012] A sixth aspect of the present invention is characterized in that, in the fifth aspect, the embedding material is poured using a 3D printer in the formwork embedding step.

[0013] A seventh aspect of the present invention, in the fifth or sixth aspect, comprises an outer frame forming step in which an outer frame is formed around the formwork using a 3D printer, and in the formwork embedding step, the embedding material is poured into the inside of the outer frame. [Effects of the Invention]

[0014] According to the first embodiment, the footing and pedestal can be formed in a single process, thereby improving the construction of the foundation of a structure by shortening the construction period, saving labor, and stabilizing quality.

[0015] According to the second embodiment, by using a 3D printer to fill the formwork, further improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved.

[0016] According to the third embodiment, the foundation can be reinforced by arranging and embedding reinforcing bars in the footing and pedestal into the concrete.

[0017] According to the fourth embodiment, a connecting member is installed that allows a structure positioned above the pedestal to be joined, and a portion of the connecting member is embedded in concrete, thereby more securely fixing the connecting member.

[0018] According to the fifth embodiment, by embedding at least a portion of the formwork in the embedded material, a foundation capable of stably supporting the structure can be constructed.

[0019] According to the sixth embodiment, by using a 3D printer for embedding the formwork, further improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved.

[0020] According to the seventh embodiment, by using a 3D printer to form the outer frame, further improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved. [Brief explanation of the drawing]

[0021] [Figure 1] It is an explanatory diagram showing an example of the reinforcing bar arrangement process. [Figure 2] It is an explanatory diagram showing an example of the formwork forming process. [Figure 3] It is an explanatory diagram showing an example of the installation process of the joining member. [Figure 4] It is an explanatory diagram showing an example of the filling process. [Figure 5] It is an explanatory diagram showing an example of fixing the joining member to the reinforcing bar. [Figure 6] It is an explanatory diagram showing an example of the foundation structure. [Figure 7] It is an explanatory diagram showing an example of the outer frame forming process. [Figure 8] It is an explanatory diagram showing an example of the formwork embedding process. [Figure 9] It is an explanatory diagram showing an example of the paving process.

Mode for Carrying Out the Invention

[0022] Hereinafter, the present invention will be described based on preferred embodiments.

[0023] <Foundation Structure Having a Footing and a Pedestal> The foundation structure 15 shown in FIG. 6 has a shape in which the footing 15a and the pedestal 15b are integrated. This foundation structure 15 can be constructed through, generally, the arrangement process of the reinforcing bars 11 shown in FIG. 1, the forming process of the formwork 12 shown in FIG. 2, and the filling process of the filling material 14 shown in FIG. 4. Although not particularly shown, an upper structure (not shown) is constructed above the pedestal 15b.

[0024] The foundation structure 15 serves as the base for the superstructure. The superstructure may be various structures or buildings. While not particularly limited, examples include workshops, offices, factories, warehouses, storage facilities, dormitories, and passageways. The structure of the superstructure is not particularly limited and may be a building with walls or columns, or a site capable of supporting loads such as people, luggage, and materials. The structural material of the superstructure is not particularly limited, but examples include reinforced concrete, steel frame, reinforced steel-reinforced concrete, wood, stone, and brick.

[0025] It is preferable that the ground 20 at the height where the foundation structure 15 will be installed is leveled by excavating the ground at the construction site before commencing the construction process of the foundation structure 15. If necessary, ground improvement such as dewatering and compaction may be carried out.

[0026] It is preferable to pour concrete onto the surface of the ground 20 to form a reference plane. It is also preferable to display various reference lines and symbols to identify the positions where the foundation structure 15, etc., will be placed on the ground 20.

[0027] It is preferable to arrange reinforcing bars 11 inside the foundation structure 15. By integrating the reinforcing bars 11 with the concrete of the filler material 14, the foundation structure 15 can be made into a reinforced concrete structure.

[0028] The reinforcing bar 11 shown in Figure 1 has a footing portion 11a positioned close to the ground 20 and a pedestal portion 11b projecting upward from the center of the footing portion 11a. The footing portion 11a is the reinforcing bar for the footing 15a, and the pedestal portion 11b is the reinforcing bar for the pedestal 15b. Although not specifically shown, the pedestal portion 11b may be positioned eccentrically from the center of the footing portion 11a.

[0029] The shape and structure of the reinforcing bars 11 are not particularly limited, but generally refer to rod-shaped steel materials. Instead of the reinforcing bars 11, or in combination with the reinforcing bars 11, steel members such as frame-shaped, plate-shaped, column-shaped, mesh-shaped, or grid-shaped members may be used. Alternatively, a structure similar to that of the reinforcing bars 11 may be formed by a combination of two or more of these types. The shape of the horizontal cross-section of the footing portion 11a is not particularly limited, but may be circular, square, polygonal, etc.

[0030] It is preferable that the pedestal portion 11b maintains a perpendicular position to the ground 20. The reinforcing bar 11 may have reinforcing members 11c to reinforce the pedestal portion 11b when fixing the connecting member 13. This allows the pedestal portion 11b to be stably supported on the footing portion 11a even if the reinforcing bar 11 is made of a simple structure or material. The reinforcing members 11c may be inclined to connect the periphery of the footing portion 11a with the upper part of the pedestal portion 11b. Multiple reinforcing members 11c may be arranged around the pedestal portion 11b evenly or at predetermined intervals.

[0031] The footing 15a has a wider horizontal cross-sectional area than the pedestal 15b. By having the footing 15a in contact with the ground 20 over a wider area, the load of the structure can be effectively transmitted to the ground, thereby providing stability. It is preferable that the shape of the footing 15a in contact with the ground 20 is uniform. For example, in the filling process described later, it is preferable to fill the space between the footing portion 11a and the ground 20 with filler material 14. This allows the footing 15a to adhere closely to the ground 20.

[0032] Although not specifically shown in the diagram, spacers made of mortar, wood, stone, etc., may be partially placed below the footing portion 11a of the reinforcing bar 11 to maintain a gap between the footing portion 11a and the ground 20. This makes it easy to fill the gap between the footing portion 11a of the reinforcing bar 11 and the ground 20 with filler material 14.

[0033] The formwork 12 in this embodiment is an integrated formwork for the footing 15a and the pedestal 15b. Specifically, the formwork 12 comprises a footing formwork 12a, which serves as the formwork for the footing 15a, and a pedestal formwork 12b, which serves as the formwork for the pedestal 15b.

[0034] In the process of forming the formwork 12, as shown in Figure 2, the footing formwork 12a and the pedestal formwork 12b are integrally formed using a 3D printer 21. The material used to form the formwork 12 is concrete or mortar. Furthermore, the core portion of the foundation structure 15 is formed by filling the inside of the formwork 12 with a filler material 14 such as concrete, as shown in Figure 4.

[0035] Conventional foundation structures having a footing and a pedestal are often in an inverted T shape, similar to the reinforcing bars 11 used in the embodiment. When forming an inverted T-shaped structure with concrete using conventional technology, it is necessary to go through the following steps in order: (a) forming the footing formwork, (b) filling the footing formwork with concrete to form the footing, (c) forming the pedestal formwork on top of the footing, and (d) filling the pedestal formwork with concrete to form the pedestal. This has the problem that it is difficult to shorten the construction period.

[0036] In this embodiment, the foundation structure 15 uses a formwork 12 in which the footing formwork 12a and pedestal formwork 12b are integrally formed, thereby forming the footing 15a and pedestal 15b as a single unit. This significantly shortens the construction period. Furthermore, since the filler material 14 forming the footing 15a and the filler material 14 forming the pedestal 15b harden integrally, defects in the joint between the footing 15a and pedestal 15b are less likely to occur.

[0037] In the construction method of the embodiment, (1-1) a formwork formation step in which the footing formwork 12a and pedestal formwork 12b are formed in one step, and (1-2) a filling step in which the filling material 14 is filled inside the formwork 12 to form the footing 15a and pedestal 15b.

[0038] Alternatively, the following steps may be carried out in order: (2-1) forming a footing formwork 12a on the ground 20, (2-2) forming a pedestal formwork 12b on the footing formwork 12a, and (2-3) filling the inside of the formwork 12 with filler material 14 to form the footing 15a and pedestal 15b.

[0039] The 3D printer 21 can form a tall structure by sequentially stacking layers of extruded material that have a certain thickness. The process of extruding material from the 3D printer 21 may be carried out continuously from the bottom of the footing formwork 12a to the top of the pedestal formwork 12b, but it is not limited to this case, and there may be interruptions in the process of forming the formwork 12.

[0040] If work is interrupted during the formation process of the formwork 12, it is preferable to cure the material and take measures to suppress drying shrinkage. For example, if work is interrupted when the lower part of the formwork 12 is being extruded from the 3D printer 21, a concrete curing agent may be applied or a setting retarder may be sprayed. If the material for the remaining part of the formwork 12 is extruded after the material forming part of the formwork 12 has hardened, chipping treatment, high-pressure water washing, adhesive application, etc. may be performed on the surface of the hardened material.

[0041] The formwork 12 of this embodiment has a shape in which the horizontal cross-sectional area decreases from the footing 15a side to the pedestal 15b side. This makes it possible to reduce the difference between the shape of the footing 15a and the shape of the pedestal 15b when the footing formwork 12a and the pedestal formwork 12b are formed integrally. For example, it is preferable that the pedestal formwork 12b has a tapered shape such as a cone or pyramidal shape.

[0042] The footing formwork 12a in the illustrated example is formed perpendicular to the ground 20. Although not specifically shown, the footing formwork 12a may have a portion that is inclined relative to the ground 20. Also, the pedestal formwork 12b in the illustrated example has an inclined shape relative to the ground 20, except for the upper part. A portion of the pedestal formwork 12b may have a portion that is perpendicular to the ground 20. Furthermore, the entire pedestal formwork 12b, from the lower part to the upper part, may have an inclined shape relative to the ground 20.

[0043] By using formwork 12 in which the footing formwork 12a and pedestal formwork 12b are integrally formed, the footing 15a and pedestal 15b can be formed in a single process, thereby improving the construction of the foundation structure 15 by shortening the construction period, saving labor, and stabilizing quality.

[0044] Furthermore, since the upper part of the formwork 12 has a small horizontal cross-sectional area, the reinforcing bars 11 are installed on the ground 20 prior to the formwork 12 formation process, as described above. Alternatively, the formwork 12 may be formed around the reinforcing bars 11 using a 3D printer 21. In this case, the reinforcing bars 11 will be surrounded by the formwork 12, except for a part of the pedestal portion 11b. This makes it possible to form a pedestal formwork 12b with a smaller horizontal cross-sectional area than the footing portion 11a of the reinforcing bars 11.

[0045] Although not specifically shown in the diagram, it is also possible to transport the formwork 12, which was formed using a 3D printer 21 at another location, to the area around the reinforcing bars 11 and then install the formwork 12 on the ground 20.

[0046] As shown in Figure 4, in the filling process of the filler material 14, concrete is used for the filler material 14 and the reinforcing bars of the reinforcing bars 11 are embedded, allowing the reinforcing bars of the footing 15a and the pedestal 15b to be arranged integrally. Since the foundation structure 15 is formed from reinforced concrete, the foundation structure 15 can be reinforced.

[0047] Concrete is made by mixing cement, water, fine aggregate, coarse aggregate, etc. Mortar is made by mixing cement, water, fine aggregate, etc. Desired admixtures may be added to concrete and mortar as needed. Examples of fine aggregate include sand and crushed sand. Examples of coarse aggregate include gravel and crushed stone. Slag and recycled aggregate may also be used as aggregate. These are classified as fine aggregate or coarse aggregate according to their particle size.

[0048] The formwork 12 may be made of either concrete or mortar. When the formwork 12 is formed using the 3D printer 21, the concrete or mortar is extruded in an unhardened state.

[0049] Since the formwork 12 includes a portion that is inclined with respect to the ground 20, it is preferable that the material of the formwork 12 in its uncured state after being extruded from the 3D printer 21 has low fluidity. When the vertical direction is 0° and the horizontal direction is 90°, the inclination angle in the portion of the formwork 12 where the horizontal cross-sectional area is reduced should be greater than 0°, but it may be, for example, about 10°, about 15°, about 20°, or about 25°.

[0050] The method of applying the filler material 14 is not particularly limited, but the filler material 14 may be filled using a 3D printer 21. By using a 3D printer 21, improvements such as shortening the construction period, saving labor, and stabilizing the quality can be achieved when filling the filler material 14. As a means other than a 3D printer 21, the filler material 14 may be filled using, for example, a concrete pump truck. The formation of the formwork 12 using a 3D printer 21 and the filling of the filler material 14 using other means may be carried out simultaneously in different locations.

[0051] When filling the inside of the formwork 12 with filler material 14 using a 3D printer 21, a concrete pump truck, etc., the concrete is extruded in an unhardened state. It is preferable that the material of the filler material 14 has high fluidity so that the filler material 14 is supplied to every corner of the formwork 12, which has a shape that reduces the horizontal cross-sectional area.

[0052] To eliminate the need to compact the filler material 14 after filling the inside of the formwork 12, it is preferable to use self-compacting concrete (so-called "high-flow concrete") as the filler material 14. As the self-compacting concrete, a material that combines high fluidity and resistance to material segregation by incorporating appropriate chemical admixtures may be used.

[0053] To create a difference in fluidity between the filler material 14 and the formwork material 12, differences in water content, admixtures, etc., may be made. The filler material 14 may have the same composition as the concrete used when formwork is formed using conventional methods. To make the formwork material 12 less fluid than the filler material 14, chemical admixtures, fibers, etc., may be added.

[0054] As described above, a superstructure (not shown) can be joined to the foundation structure 15. For this reason, it is preferable that the joining member 13 used for joining to the superstructure be embedded in the concrete of the filler material 14. This makes it easier to join the foundation structure 15 and the superstructure.

[0055] The illustrated example of the foundation structure 15 has a connecting member 13 on the upper part of the pedestal 15b. The connecting member 13 may be installed after the formwork 12 is formed, as shown in Figure 3, or before the formwork 12 is formed, as shown in Figure 5.

[0056] The joining member 13 can be used to join the superstructure by anchor bolts, welding, etc. The joining member 13 only needs to have the function of joining structural members such as steel frames, wood, columns, and exterior walls used in the superstructure. When joining the steel frame of the superstructure to the foundation structure 15, the joining member 13 may be a metal plate or the like that can be welded to the steel frame.

[0057] The reinforcing bar 11 may also have the function of fixing the connecting member 13. As shown in Figure 3, when the connecting member 13 is installed after the formwork 12 has been formed, a template 13a may be installed between the formwork 12 and the connecting member 13 to fix the positional relationship of the connecting member 13 with respect to the reinforcing bar 11 or the formwork 12.

[0058] The joining member 13 or template 13a may be assigned an identifier to identify information related to the joining of the superstructure. Examples of identifiers include tags, RFID (Radio Frequency Identification), etc. The identifier may be data recognized by wireless or other communication, a code such as a barcode or two-dimensional code that can be recognized by a machine, or a display such as letters, numbers, symbols, or figures that can be recognized by sight.

[0059] When a template 13a is used to hold the joining member 13, it is not necessary to fix the joining member 13 to the reinforcing bar 11. Although not specifically shown, as shown in Figure 6, the template 13a can also be placed between the reinforcing bar 11 and the joining member 13, even when the joining member 13 is installed before the formwork 12 is formed.

[0060] When installing the template 13a, it is preferable that the template 13a maintains the position of the joining member 13 until a portion of the joining member 13 is embedded in the filler material 14. In Figure 4, the template 13a is not shown, but it is preferable to keep the template 13a attached to the joining member 13 until the filler material 14 hardens.

[0061] It is preferable that the template 13a is removed from the formwork 12 after the filler material 14 has hardened. This makes it possible to simplify the design by ignoring the influence of the template 13a on the structure, even if a simple template 13a with low strength is used. Considering the removal of the template 13a, it is preferable to place the template 13a on top of the joining member 13 so that the template 13a is not embedded in the filler material 14.

[0062] The material of template 13a is not particularly limited, and one or more types of materials such as rebar, wood, resin, concrete, stone, and brick can be used. If template 13a is made of resin, it may be molded using a resin 3D printer (not shown).

[0063] When fixing the template 13a to the formwork 12, the connecting member 13 may be held so as not to come into contact with the reinforcing bar 11. This ensures that even if there are errors in the dimensions, shape, etc., of the reinforcing bar 11, the connecting member 13 is positioned relative to the formwork 12 via the template 13a. To increase the joint strength between the connecting member 13 and the reinforcing bar 11, the connecting member 13 may be fixed to the reinforcing bar 11 using a device, adhesive, or the like.

[0064] The portion of the joining member 13 necessary for fixing to the joining member 13 is embedded in the filler material 14. The portion of the joining member 13 that connects to the superstructure protrudes above the filler material 14. Although not specifically shown, the joining member 13 only needs to be exposed upwards and does not need to protrude above the filler material 14 or from the upper end of the formwork 12. The plate of the joining member 13 may be embedded after welding.

[0065] It is preferable that the anchor bolts used in the joining member 13 become integrated with the concrete while embedded in the unhardened concrete supplied as the filler material 14. Although not specifically shown, it is also possible to use post-installed anchor bolts. In this case, the anchor bolts are installed after the filler material 14 has hardened.

[0066] When forming the formwork 12 using the 3D printer 21, design data showing the shape of the formwork 12 is prepared in advance. The 3D printer 21 extrudes material to a predetermined position according to the design data, forming the structure. If multiple foundation structures 15 are constructed with the same design, the same design data can be used to repeatedly form the formwork 12.

[0067] To facilitate the control of the extrusion position of the 3D printer 21, the 3D printer 21 may be supported by a support such as a gantry 22, as shown in Figure 6. The gantry 22 is guided by rails extending in a predetermined direction, allowing the extrusion position of the 3D printer 21 to be guided to a desired position within the range of the rails. Although not specifically shown, the 3D printer 21 may also be operated using a robotic arm, crane, or the like.

[0068] <Formation of the outer frame and embedding of the formwork> To bury the foundation structure 15 formed using formwork 12, as shown in Figure 7, an outer frame 23 may be formed around the formwork 12, and then, as shown in Figure 8, the burying material 24 may be poured into the inside of the outer frame 23 using a 3D printer 21. Since it is not necessary to remove the formwork 12, improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved. In addition, if the burying material 24 is to be poured up to the extent of the step or slope formed when the ground 20 is excavated, the formation of the outer frame 23 may be omitted.

[0069] The material and construction method of the outer frame 23 are not particularly limited, but the outer frame 23 may be formed using a 3D printer 21. By using a 3D printer 21, improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved when forming the outer frame 23. The material of the outer frame 23 is not particularly limited, but examples include concrete and mortar.

[0070] The outer frame 23 is preferably a wall-like structure formed to prevent the outflow of the buried material 24. To reinforce the outer frame 23, retaining walls may be installed on the sides of the outer frame 23, and a cantilevered base plate or the like may be installed at the bottom of the outer frame 23.

[0071] The relationship between the construction period of the foundation structure 15 and the timing of the formation of the outer frame 23 is not particularly limited and may be before the formation of the formwork 12, during the formation of the formwork 12, after the formation of the formwork 12, after the filling material 14 has been filled into the inside of the formwork 12, or after the filling material 14 has hardened and the foundation structure 15 is completed.

[0072] The foundation structure 15 is preferably installed on the ground 20 located underground through excavation. Furthermore, in order for the superstructure to be stably supported by the foundation structure 15, it is preferable to embed at least a portion of the foundation structure 15 in the buried material 24.

[0073] The buried material 24 is not particularly limited, but examples include concrete, mortar, soil, sand, etc. Two or more types of buried material 24 may be mixed and used. Soil and sand generated by excavating the ground 20 before construction may be used as at least a portion of the buried material 24.

[0074] The method of constructing the buried material 24 is not particularly limited, but the buried material 24 may be poured using a 3D printer 21. By using a 3D printer 21, improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved when burying the foundation structure 15. As a means other than a 3D printer 21, the buried material 24 may be poured using, for example, a concrete pump truck.

[0075] The pouring of the embedded material 24 may be carried out after the filler material 14 has hardened and the foundation structure 15 is completed. If the formwork 12 has hardened, it is possible to pour the embedded material 24 around the formwork 12 even before the filler material 14 is filled inside the formwork 12. By bringing forward the construction of the outer formwork 23 and the embedded material 24 before the completion of the foundation structure 15, the construction period can be further shortened.

[0076] The outer frame 23 and buried material 24 only need to be placed where necessary around the formwork 12, and do not need to be placed over the entire area where the superstructure will be constructed. For example, in areas where pipes, cables, etc., are to be placed, the outer frame 23 and buried material 24 may not be placed, leaving space underground.

[0077] The depth to which the embedding material 24 is poured inside the outer frame 23 may be equal to the height of the outer frame 23. Alternatively, the pouring of the embedding material 24 may be stopped at a position lower than the height of the outer frame 23.

[0078] As shown in Figure 9, paving material 25 may be laid on top of the embedded material 24. The paving material 25 may also be made by extruding a fluid material such as concrete or mortar from a 3D printer 21. This makes it possible to improve the laying of the paving material 25 by shortening the construction period, saving labor, and stabilizing the quality. The paving material 25 may have a slope in an appropriate direction to ensure good drainage.

[0079] Figure 9 shows an example where the outer frame 23 is not shown, and the paving material 25 is laid inside the foundation structure 15. Although not specifically shown, the paving material 25 may be laid until it reaches the outer frame 23.

[0080] Furthermore, although not specifically shown in the diagrams, it is also possible to pave the area above the embedded material 24 using concrete, asphalt, tiles, bricks, etc. Different construction methods may be used for these paving operations compared to those using the 3D printer 21.

[0081] Although the present invention has been described above based on preferred embodiments, the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. Modifications include adding, substituting, omitting, or otherwise changing the components in each embodiment. [Industrial applicability]

[0082] The use of the foundation structure constructed according to the present invention is not particularly limited, but it can be applied to various structures and buildings at sites such as resource development and plant construction. [Explanation of Symbols]

[0083] 11...Reinforcement bars, 11a...Footing section, 11b...Pedestal section, 11c...Reinforcement material, 12...Formwork, 12a...Footing formwork, 12b...Pedestal formwork, 13...Joining members, 13a...Template, 14...Filling material, 15...Foundation structure, 15a...Footing, 15b...Pedestal, 20...Ground, 21...3D printer, 22...Gantry, 23...Outer frame, 24...Buried material, 25...Paving material.

Claims

1. A method for constructing the foundation of a structure having a footing and a pedestal, A rebar placement step for arranging the reinforcing bars of the footing and the pedestal, A formwork formation step in which a formwork that will become an integrated formwork for the footing and the pedestal is formed from concrete or mortar using a 3D printer, A filling step in which concrete is filled into the inside of the formwork and the reinforcing bars are embedded, It has, The aforementioned reinforcing bar has a footing portion, a pedestal portion projecting upward from the footing portion, and an inclined reinforcing member connecting the peripheral edge of the footing portion and the upper part of the pedestal portion. A method for constructing the foundation of a structure, characterized in that the formwork has a shape in which the horizontal cross-sectional area decreases around the reinforcing bars from the footing side toward the pedestal side.

2. The method for constructing the foundation of a structure according to claim 1, characterized in that the concrete is filled using a 3D printer in the filling step.

3. (delete)

4. Prior to the filling process, a joining member is installed that allows the structure to be placed above the pedestal to be joined by anchor bolts or welding. A method for constructing the foundation of a structure according to claim 1 or 2, characterized in that, in the filling step, a part of the joining member is embedded in the concrete that is filled inside the formwork.

5. A method for constructing the foundation of a structure according to claim 1, 2, or 4, characterized by comprising a formwork embedding step of pouring embedding material around the formwork and embedding at least a portion of the formwork in the embedding material.

6. The method for constructing the foundation of a structure according to claim 5, characterized in that, in the formwork embedding step, the embedding material is poured using a 3D printer.

7. The process includes an outer frame formation step in which an outer frame is formed around the aforementioned mold using a 3D printer, The method for constructing the foundation of a structure according to claim 5 or 6, characterized in that, in the formwork embedding step, the embedding material is poured into the inside of the outer frame.

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