Method for constructing foundation of structure

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

Methods for constructing foundations for structures

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

[0002] At resource development, plant construction, and other sites, various structures must be constructed. The construction of buildings and other structures requires a large initial investment and a long construction period, significantly impacting the overall development. Furthermore, structures may be constructed in mountainous or wilderness areas far from urban areas, which requires time and money to transport workers and materials, and it may not be easy to secure skilled workers. For this reason, improvements such as shortening construction periods, reducing labor, and stabilizing quality are required.

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

[0004] Japanese Patent Application Publication No. 2020-111941

[0005] According to the proposal in Patent Document 1, when constructing a reinforced concrete structure such as a bridge pier, by using a fiber-reinforced mortar form as a formwork, it is suggested that earthquake resistance and restorability can be improved even if the formwork is not dismantled and is integrated with the concrete core. However, no particular proposal or suggestion is given regarding the foundation of the structure.

[0006] An object of the present invention is to provide a method for constructing a foundation of a structure that can shorten the construction period, save labor, stabilize quality, and improve the construction of the foundation of a structure.

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

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

[0009] A third aspect of the present invention is characterized in that, in the first or second aspect, a reinforcing bar arranging step of arranging reinforcing bars for the footing and the pedestal is included prior to the formwork forming step, and in the filling step, the reinforcing bars are embedded in the concrete 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, prior to the filling step, connecting members are installed to enable structures to be placed above the pedestal to be joined by anchor bolts or welding, and in the filling step, a portion of the connecting members is embedded in the concrete 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, it includes a form embedding step of pouring a filler material around the form and embedding at least a portion of the form in the filler material.

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

[0013] A seventh aspect of the present invention is characterized in that, in the fifth or sixth aspect, it has an outer frame forming process in which an outer frame is formed around the formwork using a 3D printer, and in the formwork embedding process, the embedding material is poured inside the outer frame.

[0014] According to the first aspect, the footing and pedestal can be formed in a single process, which allows for improvements such as shortening of construction time, labor savings, and stable quality when constructing the foundation of a structure.

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

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

[0017] According to the fourth aspect, by installing a joining member that enables joining of structures placed above the pedestal and embedding a portion of the joining member in concrete, the joining member can be fixed more securely.

[0018] According to the fifth aspect, by embedding at least a portion of the formwork in the embedding material, it is possible to construct a foundation that can stably support a structure.

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

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

[0021] FIG. 1 is an explanatory diagram showing an example of a reinforcing bar arrangement process; FIG. 2 is an explanatory diagram showing an example of a formwork formation process; FIG. 3 is an explanatory diagram showing an example of a joining member installation process; FIG. 4 is an explanatory diagram showing an example of a filling process; FIG. 5 is an explanatory diagram showing an example of joining members fixed to reinforcing bars; FIG. 6 is an explanatory diagram showing an example of a foundation structure; FIG. 7 is an explanatory diagram showing an example of an outer frame formation process; FIG. 8 is an explanatory diagram showing an example of a formwork embedding process; FIG. 9 is an explanatory diagram showing an example of a paving process.

[0022] The present invention will be described below based on preferred embodiments.

[0023] <Foundation having a footing and a pedestal> The foundation 15 shown in Fig. 6 has a shape in which a footing 15a and a pedestal 15b are integrated. This foundation 15 can be constructed generally through the steps of arranging reinforcing bars 11 shown in Fig. 1, forming formwork 12 shown in Fig. 2, and filling with filler material 14 shown in Fig. 4. Although not specifically shown, a superstructure (not shown) is constructed above the pedestal 15b.

[0024] The foundation structure 15 serves as the foundation for the superstructure. The superstructure may be any of a variety of structures or buildings. Examples of such structures include, but are not limited to, a workshop, office, factory, warehouse, storage facility, dormitory, and passageway. The structure of the superstructure is not particularly limited, and may be a building with walls or columns, or a site capable of supporting the load of people, luggage, materials, and the like. The structural material of the superstructure is not particularly limited, and examples thereof include, but are not limited to, reinforced concrete, steel frame, reinforced steel frame concrete, wood, stone, brick, and the like.

[0025] It is preferable that the ground 20 at the height where the foundation structure 15 is to be installed is excavated and leveled at the planned construction site before starting the construction process of the foundation structure 15. If necessary, ground improvement such as dewatering and compaction may be performed.

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

[0027] It is preferable that reinforcing bars 11 are placed inside the foundation structure 15. The reinforcing bars 11 are integrated with the concrete of the filler material 14, thereby making the foundation structure 15 a reinforced concrete structure.

[0028] 1 has a footing portion 11a disposed close to the ground 20 and a pedestal portion 11b protruding upward from the center of the footing portion 11a. The footing portion 11a is a reinforcing bar for the footing 15a, and the pedestal portion 11b is a reinforcing bar for the pedestal 15b. Although not particularly shown, the pedestal portion 11b may be located 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. Steel members such as frame-shaped, plate-shaped, column-shaped, mesh-shaped, and lattice-shaped members may be used instead of or in combination with the reinforcing bars 11. Alternatively, a structure similar to the reinforcing bars 11 may be formed by combining two or more of these. The shape of the horizontal cross section of the footing portion 11a is not particularly limited, but may be circular, rectangular, polygonal, or the like.

[0030] It is preferable that the pedestal portion 11b be maintained perpendicular to the ground 20. The reinforcing bar 11 may have a reinforcing member 11c to reinforce the pedestal portion 11b when, for example, 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 member 11c may be inclined so as to connect the peripheral edge of the footing portion 11a with the upper portion of the pedestal portion 11b. A plurality of reinforcing members 11c may be arranged around the pedestal portion 11b, either uniformly or at predetermined intervals.

[0031] The footing 15a has a wider horizontal cross-sectional area than the pedestal 15b. The footing 15a contacts the ground 20 over a wider area, thereby effectively transmitting the load of the structure to the ground and 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 step described below, it is preferable to fill the gap between the footing portion 11a and the ground 20 with filler 14. This allows the footing 15a to adhere closely to the ground 20.

[0032] Although not particularly shown, spacers such as mortar, wood, or stone may be partially placed under the footing portion 11a of the reinforcing bar 11 to maintain a gap between the footing portion 11a of the reinforcing bar 11 and the ground 20. This makes it easy to fill the filler 14 between the footing portion 11a of the reinforcing bar 11 and the ground 20.

[0033] The formwork 12 of the embodiment is an integrated formwork for the footing 15 a and the pedestal 15 b. Specifically, the formwork 12 includes a footing formwork 12 a that serves as the formwork for the footing 15 a and a pedestal formwork 12 b that serves as the formwork for the pedestal 15 b.

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

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

[0036] In the foundation structure 15 of this embodiment, the footing 15a and the pedestal 15b are integrally formed using a formwork 12 in which the footing formwork 12a and the pedestal formwork 12b are integrally formed. This significantly reduces the construction period. Furthermore, since the filler material 14 forming the footing 15a and the filler material 14 forming the pedestal 15b harden integrally, poor bonding between the footing 15a and the pedestal 15b is less likely to occur.

[0037] In the construction method of the embodiment, (1-1) a formwork formation process for forming a footing formwork 12a and a pedestal formwork 12b in one step, and (1-2) a filling process for filling the inside of the formwork 12 with filler material 14 to form a footing 15a and a pedestal 15b may be carried out.

[0038] In addition, 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 a footing 15a and a pedestal 15b.

[0039] The 3D printer 21 forms the dispensed material into layers of a certain thickness and sequentially stacks them to form a tall structure. The process of discharging material from the 3D printer 21 may be performed continuously from the bottom of the footing formwork 12a to the top of the pedestal formwork 12b, but this is not limited to this case, and there may be times when work is interrupted during the process of forming the formwork 12.

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

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

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

[0043] By using formwork 12 in which footing formwork 12a and pedestal formwork 12b are integrally formed, footing 15a and pedestal 15b can be formed in a single process, which allows for improvements in the construction of foundation structure 15, such as shortened construction time, labor savings, and stable quality.

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

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

[0046] As shown in Figure 4, in the process of filling the filler 14, concrete is used as the filler 14 and the reinforcing bars 11 are embedded in it, so that the reinforcing bars of the footing 15a and the reinforcing bars of the pedestal 15b can be integrally arranged. Since the foundation 15 is made of reinforced concrete, the foundation 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 or mortar as needed. Examples of fine aggregate include sand, crushed sand, etc. Examples of coarse aggregate include gravel, crushed stone, etc. Slag, recycled aggregate, etc. may also be used as aggregate. These are classified as fine aggregate or coarse aggregate depending on the particle size.

[0048] Either concrete or mortar may be used as the material of the formwork 12. When the formwork 12 is formed using the 3D printer 21, the concrete or mortar is dispensed 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 an unhardened state after being discharged from the 3D printer 21 has low fluidity. When the vertical direction is 0° and the horizontal direction is 90°, the inclination angle of the portion of the formwork 12 where the horizontal cross-sectional area decreases should be greater than 0°, but may be, for example, about 10°, 15°, 20°, or 25°.

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

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

[0052] It is preferable to use self-compacting concrete (so-called "high-fluidity concrete") as the filler 14, since this eliminates the need to compact the filler 14 after filling the formwork 12. As the self-compacting concrete, a material that has been blended with an appropriate chemical admixture to provide both high fluidity and resistance to material separation may be used.

[0053] To achieve a difference in fluidity between the filler 14 and the formwork 12 materials, differences in water content, admixtures, etc. may be used. The filler 14 may have the same composition as the concrete used when forming a formwork by a conventional method. The formwork 12 material may contain chemical admixtures, fibers, etc. to provide a material with lower fluidity than the filler 14.

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

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

[0056] The connecting members 13 can be used to connect the superstructure by anchor bolts, welding, etc. The connecting members 13 only need to have the function of connecting structural members such as steel frames, wood, columns, exterior walls, etc. used in the superstructure. When connecting the steel frames of the superstructure to the foundation structure 15, the connecting members 13 may be metal plates or the like that can be welded to the steel frames.

[0057] The reinforcing bars 11 may have a function of fixing the connecting members 13. As shown in Fig. 3, when the connecting members 13 are installed after the formwork 12 is formed, a template 13a may be placed between the formwork 12 and the connecting members 13 to fix the positional relationship of the connecting members 13 with respect to the reinforcing bars 11 or the formwork 12.

[0058] An identifier may be attached to the joining member 13 or the template 13a in order to identify information related to the joining of the superstructure, etc. Examples of the identifier include a tag plate and RFID (Radio Frequency Identification). The identifier may be data that can be recognized by wireless communication or the like, a code such as a barcode or a two-dimensional code that can be recognized by a machine, or an indication such as letters, numbers, symbols, or figures that can be recognized visually.

[0059] When a template 13a is used to hold the connecting members 13, the connecting members 13 do not need to be fixed to the reinforcing bars 11. Although not particularly shown, as shown in Figure 6, even when the connecting members 13 are installed before the formwork 12 is formed, the template 13a can also be installed between the reinforcing bars 11 and the connecting members 13.

[0060] When the template 13a is placed, it is preferable that the template 13a maintain the position of the joining member 13 until a portion of the joining member 13 is embedded in the filler material 14. Although the template 13a is not shown in Fig. 4, it is preferable that the template 13a be maintained in a state attached to the joining member 13 until the filler material 14 hardens.

[0061] The template 13a is preferably removed from the formwork 12 after the filler material 14 has hardened. This makes it possible to easily design a template 13a with a simple structure and low strength, while ignoring the effect of the template 13a on the structure. In consideration of the removal of the template 13a, it is preferable to install the template 13a above the joining member 13 so that the template 13a is not embedded in the filler material 14.

[0062] The material of the template 13a is not particularly limited, and it is possible to use one or more of steel bars, wood, resin, concrete, stone, brick, etc. When the template 13a is made of resin, the template 13a may be molded using a 3D printer for resin (not shown).

[0063] When the template 13a is fixed to the formwork 12, the joining members 13 may be held so as not to come into contact with the reinforcing bars 11. This allows the joining members 13 to be positioned relative to the formwork 12 via the template 13a even if there is an error in the dimensions, shape, etc. of the reinforcing bars 11. When the joining strength between the joining members 13 and the reinforcing bars 11 is to be increased, the joining members 13 may be fixed to the reinforcing bars 11 with a tool, adhesive, etc.

[0064] The portions of the joining members 13 necessary for fixing to the joining members 13 are embedded in the filler material 14. The joining portions of the joining members 13 that are to be joined to the upper structure protrude above the filler material 14. Although not particularly shown, the joining members 13 only need to be exposed upward, and do not have to protrude above the filler material 14 or protrude from the upper end of the formwork 12. The plates of the joining members 13 may be embedded after welding.

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

[0066] When forming the formwork 12 using the 3D printer 21, design data indicating the shape of the formwork 12 is prepared in advance. The 3D printer 21 ejects material at predetermined positions in accordance with the design data to form a structure. When multiple substructures 15 are constructed with the same design, the same design data can be used to repeatedly form the formworks 12.

[0067] To facilitate management of the discharge position of the 3D printer 21, the 3D printer 21 may be supported on a support such as a gantry 22, as shown in Fig. 6. The gantry 22 is guided by rails extending in a predetermined direction, and can guide the discharge position of the 3D printer 21 to a desired position within the range of the rails. Although not particularly shown, the 3D printer 21 may also be operated using a robot arm, crane, or the like.

[0068] <Forming the Outer Frame and Embedding the Formwork> To embed the foundation structure 15 formed using the formwork 12, an outer frame 23 may be formed around the formwork 12 as shown in Fig. 7, and then a 3D printer 21 may be used to pour embedding material 24 into the inside of the outer frame 23 as shown in Fig. 8. Since there is no need to remove the formwork 12, improvements such as a shorter construction period, labor savings, and stable quality can be achieved. Note that if the embedding material 24 is poured up to the extent of a step or slope formed when the ground 20 is excavated, the formation of the outer frame 23 may be omitted.

[0069] The material, construction method, etc. of the outer frame 23 are not particularly limited, but the outer frame 23 may be formed using a 3D printer 21. By using the 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 thereof include concrete, mortar, etc.

[0070] The outer frame 23 preferably has a wall-like structure formed to prevent the outflow of the embedding material 24. To reinforce the outer frame 23, buttresses may be installed on the sides of the outer frame 23, and a cantilever-type bottom plate or the like may be installed on the lower part of the outer frame 23.

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

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

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

[0074] The method for constructing the buried material 24 is not particularly limited, but the buried material 24 may be poured using a 3D printer 21. By using the 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 the 3D printer 21, for example, a concrete pump truck or the like may be used to pour the buried material 24.

[0075] The filling material 24 may be poured after the filling material 14 has hardened and the foundation structure 15 has been completed. After the formwork 12 has hardened, the filling material 24 can be poured around the formwork 12 even before the filler material 14 is filled into the formwork 12. By constructing the outer frame 23 and the filling material 24 ahead of the completion of the foundation structure 15, the construction period can be further shortened.

[0076] The outer frame 23 and buried materials 24 may be placed in necessary locations around the formwork 12, and do not have to be placed over the entire area where the superstructure will be constructed. For example, in areas where pipes, cables, etc. will be placed, the outer frame 23 and buried materials 24 may not be placed, and space may be secured 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 completed at a position lower than the height of the outer frame 23.

[0078] As shown in Figure 9, a paving material 25 may be laid on top of the embedded material 24. The paving material 25 may be made by discharging a fluid material such as concrete or mortar from the 3D printer 21. This allows for improvements such as a shorter construction period, less labor, and more consistent quality when laying the paving material 25. The paving material 25 may have a slope in an appropriate direction to improve drainage.

[0079] 9 shows an example in which 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 up to reach the outer frame 23.

[0080] Although not specifically shown, it is also possible to pave the buried material 24 using concrete, asphalt, tiles, bricks, etc. For such paving, a construction method different from that used by the 3D printer 21 may be used.

[0081] While the present invention has been described above based on preferred embodiments, the present invention is not limited to the above-described embodiments and various modifications are possible without departing from the spirit of the present invention. Modifications include addition, substitution, omission, and other changes to components in each embodiment.

[0082] The use of the foundation 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.

[0083] 11...reinforcing bar, 11a...footing portion, 11b...pedestal portion, 11c...reinforcing material, 12...formwork, 12a...footing formwork, 12b...pedestal formwork, 13...jointing member, 13a...template, 14...filler, 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. 1. A method for constructing a foundation for a structure having a footing and a pedestal, comprising the steps of: a reinforcing bar arrangement step of arranging reinforcing bars of the footing and the pedestal; A form forming process of forming a form that becomes an integrated form of the footing and the pedestal from concrete or mortar using a 3D printer; a filling step of filling the inside of the formwork with concrete to embed the reinforcing bar; having The reinforcing bar has a footing portion, a pedestal portion protruding upward from the footing portion, and a reinforcing member that is inclined so as to connect a peripheral portion of the footing portion and an upper portion of the pedestal portion, 13. A method for constructing a foundation for a structure, wherein the formwork has a shape in which the horizontal cross-sectional area decreases around the reinforcing bar from the footing side to the pedestal side.

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

3. (delete)

4. Prior to the filling step, a joining member is installed to enable a structure to be placed above the pedestal to be joined by an anchor bolt or welding; 3. The method for constructing a foundation for a structure according to claim 1, wherein in the filling step, a part of the connecting member is embedded in the concrete filled inside the formwork.

5. 5. A method for constructing a foundation for a structure according to claim 1, further comprising a form embedding step of pouring a filler material around the form and embedding at least a portion of the form in the filler material.

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

7. An outer frame forming step of forming an outer frame around the mold using a 3D printer, 7. The method for constructing a foundation for a structure according to claim 5 or 6, wherein the embedding material is poured inside the outer frame in the formwork embedding step.