Truss reinforcement, construction method for structures, and method for manufacturing truss reinforcement

Abstract

This invention provides truss reinforcement suitable for the construction of structures using a construction 3D printer, a method for constructing structures using the same, and a method for manufacturing truss reinforcement. [Solution] The truss reinforcement 10 includes a zigzag-shaped lattice reinforcement 12, a plurality of penetrating reinforcement bars 14 arranged in a direction that intersects with the lattice reinforcement 12 and is in contact with the inside of the bent portion of the lattice reinforcement 12, and a rod-shaped main reinforcement bar 16 arranged in contact with the penetrating reinforcement bars 14 and the lattice reinforcement 12 on the opposite side of the penetrating reinforcement bars 14 from the side that is in contact with the bent portion of the lattice reinforcement 12.

Description

Technical Field

[0001] The present invention relates to a truss bar suitable for the construction of a structure using a construction 3D printer, a method for constructing a structure using the same, and a method for manufacturing the truss bar.

Background Art

[0002] In recent years, the construction of structures using construction 3D printers has attracted attention. By supplying and laminating mortar in layers from the nozzle of a 3D printer, structures of various shapes can be formed without using a formwork, which is excellent in terms of workability, labor saving, and design freedom. When sufficient strength cannot be obtained only with mortar, reinforcing bars are used in the same manner as in general concrete structures. For example, when forming a truss structure wall excellent in structural strength and heat insulation with a 3D printer, it is conceivable to use a truss bar having a shape along the truss structure wall. The truss bar has a configuration in which zigzag lattice bars (diagonal members) are installed between a pair of main bars (chords) arranged in parallel, and the main bars and the lattice bars are joined by spot welding or arc welding (see, for example, Patent Document 1). Such truss bars have been widely used for reinforcing concrete structures. In general concrete structures, a three-dimensional truss bar in which two lattice bars are arranged in a V shape (mountain shape) is often used.

[0003] On the other hand, in the construction of structures using a construction 3D printer, it is assumed that a planar truss bar is laid on the mortar layer during the printing process. The application target of the planar truss bar is not limited to the truss structure wall, and it is expected to use a planar truss bar that is easy to manufacture and excellent in strength when forming other shaped structures with a 3D printer.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] However, in conventional planar truss reinforcement, the strength of the welds is lower compared to the strength of the main reinforcement and lattice reinforcement, and the overall strength of the truss reinforcement may not be as expected from the strength of the main reinforcement and lattice reinforcement. For example, in welded wire mesh and reinforcement grids using small diameter steel wire, spot welding is applied to the orthogonal intersections, and the strength of the weld can only be expected to be less than half of the strength of the base material. Specifically, for CD4.5mm material, the standard yield strength is 440N / mm 2 200-220 N / mm 2 For D4 rebar, the material (SD295: 295N / mm 2 SD345: 345 N / mm 2 Regardless of ) 100 N / mm 2 When constructing structures using a 3D printer, it is anticipated that relatively small-diameter main reinforcement bars and lattice reinforcement bars may be used. Similarly, when applying spot welding to truss reinforcement bars made of small-diameter bars, there is a problem of insufficient strength. As a result, the strength of the welded joint between the main reinforcement bars and lattice reinforcement bars may be low, and sufficient reinforcement effect may not be obtained. In addition, structures formed with a 3D printer tend to have lower adhesion strength at the boundary of the mortar layer than the tensile strength of the concrete, making them prone to delamination and relative slippage at the boundary. Conventional planar truss reinforcement bars may not provide sufficient reinforcement effect to prevent such delamination and relative slippage at the boundary of the mortar layer. The present invention has been made in view of the above problems, and aims to provide truss reinforcement bars suitable for the construction of structures using a construction 3D printer, a method for constructing structures using the same, and a method for manufacturing truss reinforcement bars. [Means for solving the problem]

[0006] The present invention solves the above problem with a truss reinforcement that includes a zigzag-shaped lattice reinforcement, a plurality of penetrating reinforcements arranged in a direction that intersects with the lattice reinforcement and is in contact with the inside of the bent portion of the lattice reinforcement, and a rod-shaped main reinforcement arranged in contact with the penetrating reinforcement and the lattice reinforcement on the opposite side of the penetrating reinforcement that is in contact with the bent portion of the lattice reinforcement.

[0007] Compressive or tensile forces are generated in the diagonal members, which are components of a truss structure wall. In this truss reinforcement, the main reinforcement and lattice reinforcement are connected via penetrating reinforcement. Therefore, when tensile force is generated in the diagonal members, causing the mortar to crack and exerting a pulling force on the lattice reinforcement, the lattice reinforcement is supported by the main reinforcement via the penetrating reinforcement, regardless of the strength of the connection between the main reinforcement and the penetrating reinforcement and / or the lattice reinforcement. Thus, the strength expected from the strength of the main reinforcement and lattice reinforcement is reliably obtained. Furthermore, when a compressive force is applied to the lattice reinforcement, the compressive force is borne by the mortar in which the truss reinforcement is embedded, and the lattice reinforcement is not required to bear compressive force in the design. In addition, since the penetrating reinforcement extends in the vertical direction perpendicular to the boundary of the mortar layer, a reinforcing effect is obtained that prevents peeling and relative sliding at the boundary of the mortar layer. Moreover, the effect of suppressing the warping of the truss reinforcement is obtained by embedding the penetrating reinforcement in the upper and lower mortar layers. Furthermore, since the truss reinforcement is laid in the mortar layer, penetrating reinforcement extending in the vertical direction is provided, eliminating the need to lay other reinforcement extending in the vertical direction, thus simplifying the reinforcement work. In addition, since multiple penetrating reinforcement protrudes from the lattice reinforcement so that they can be thrust into and embedded in the mortar layer formed by the construction 3D printer, the penetrating reinforcement can be securely embedded in the mortar layer, making the laying of the reinforcement into the mortar layer easy.

[0008] Alternatively, the truss reinforcement may be configured with two lattice bars arranged parallel to each other, with the penetrating reinforcement positioned across both lattice bars, and the main reinforcement positioned between the two lattice bars, in contact with the penetrating reinforcement and the two lattice bars. A truss reinforcement with two lattice bars has greater strength and a higher reinforcing effect on the structure. Furthermore, since the two lattice bars engage with the penetrating reinforcement on both sides of the main reinforcement, when a tensile force is applied to the lattice bars, it is less likely to cause a tilting force on the penetrating reinforcement, thus increasing the strength of the truss reinforcement and the reinforcing effect on the structure. In addition, by laying the truss reinforcement so that one lattice bar is placed in the layer on one side of the boundary of the mortar layer and the other lattice bar is placed in the layer on the other side of the boundary, the reinforcing effect that prevents peeling and relative sliding at the boundary of the mortar layer can also be enhanced.

[0009] Furthermore, the penetrating reinforcement may have a rod-shaped main part positioned in contact with the bent portion of the lattice reinforcement, and a bent end formed at one end of the main part. The bent end functions as a hook to anchor the reinforcement, thus preventing or suppressing the separation (delamination) of the interlayers and increasing the interlayer strength.

[0010] Furthermore, at least one of the penetration bars and the main bars may be attached to the lattice bars without welding. If both the penetration bars and the main bars are firmly welded to the lattice bars, when an external force is applied, the deformation of the main bars and lattice bars at or near the weld will be suppressed, which can be a cause of fracture of these members. In contrast, if the penetration bars and / or main bars are not welded to the lattice bars, the main bars and lattice bars will be more susceptible to elongation deformation, which can be expected to suppress the fracture of these members. Since the main bars and lattice bars are connected via the penetration bars, even if the penetration bars and / or main bars are not welded to the lattice bars, the lattice bars are reliably supported by the main bars via the penetration bars. In addition, the structure of the truss reinforcement is simplified by omitting the welding between the penetration bars and / or main bars and the lattice bars. Furthermore, it simplifies the manufacturing of truss reinforcement bars, contributing to increased productivity.

[0011] Furthermore, the present invention solves the above problems by a construction method for a structure that includes a lower mortar layer formation step of supplying mortar in layers from the nozzle of a construction 3D printer to form a lower mortar layer, a truss reinforcement laying step of laying any of the above-mentioned truss reinforcements on top of the lower mortar layer, and an upper mortar layer formation step of supplying mortar in layers from the nozzle on top of the truss reinforcements and the lower mortar layer to form an upper mortar layer. Since the above-mentioned truss reinforcements have multiple penetrating reinforcements that protrude from the lattice reinforcements so that they can be pierced and embedded in the mortar layer formed by the construction 3D printer, when the truss reinforcements are laid on top of the lower mortar layer in the truss reinforcement laying step, all of the penetrating reinforcements are reliably embedded in the lower mortar layer.

[0012] Furthermore, the present invention solves the above problems by a method for manufacturing a truss reinforcement, which includes: a penetration reinforcement joining step of alternately arranging a plurality of penetration reinforcements at predetermined intervals along the longitudinal direction of a rod-shaped lattice reinforcement material in a direction that intersects with the lattice reinforcement material and in contact with the opposite side surface of the lattice reinforcement material, thereby joining the penetration reinforcements to the lattice reinforcement material; a lattice reinforcement bending step of bending the lattice reinforcement material at the joint with the penetration reinforcements so that the penetration reinforcements face inward to obtain a zigzag-shaped lattice reinforcement; and a main reinforcement joining step of arranging a rod-shaped main reinforcement so that it is in contact with the penetration reinforcements and the lattice reinforcement on the side opposite to the side of the penetration reinforcements that is in contact with the bent portion of the lattice reinforcement, and joining it to at least one of the penetration reinforcements and the lattice reinforcement. According to this method for manufacturing truss reinforcement, the aforementioned truss reinforcement, in which the main reinforcement and lattice reinforcement are connected via penetrating reinforcement, can be easily and efficiently manufactured.

[0013] In the lattice rebar bending process, a jig having an outer circumference shaped to correspond to the inner circumference shape of the bent portion of the lattice rebar, and having a recess for accommodating the penetrating rebar formed on the outer circumference, may be brought into contact with the lattice rebar material to bend the lattice rebar material. By using such a jig, the lattice rebar bending process can be carried out efficiently and easily.

[0014] Furthermore, in the penetration reinforcement joining process, multiple lattice reinforcement materials may be arranged in parallel, and rod-shaped penetration reinforcement materials of a length that intersects with the multiple lattice reinforcement materials may be joined to each of the multiple lattice reinforcement materials. After the penetration reinforcement joining process, a penetration reinforcement cutting process may be performed in which the penetration reinforcement materials are cut and divided into multiple penetration reinforcements. In this way, truss reinforcement with a configuration in which the main reinforcement and lattice reinforcement are joined via penetration reinforcement can be manufactured even more efficiently. Note that the penetration reinforcement cutting process may be performed before the lattice reinforcement bending process or after the lattice reinforcement bending process. If the penetration reinforcement cutting process is performed after the lattice reinforcement bending process, multiple lattice reinforcement materials should be bent simultaneously in the lattice reinforcement bending process.

[0015] Alternatively, in the penetration reinforcement joining process, two lattice reinforcement materials may be placed parallel to each other with only enough space to sandwich one main reinforcement; in the lattice reinforcement bending process, the two lattice reinforcement materials may be bent simultaneously; and in the main reinforcement joining process, the main reinforcement may be placed between the two lattice reinforcements and joined to the penetration reinforcement and at least one of the two lattice reinforcements. In this way, a truss reinforcement in which two lattice reinforcements are joined to the main reinforcement via the penetration reinforcement can be efficiently manufactured.

[0016] Furthermore, in the penetration reinforcement joining process, multiple pairs of lattice reinforcement materials may be arranged in parallel, and penetration reinforcement materials of a length that intersects with multiple pairs of lattice reinforcement materials may be joined to each of the multiple pairs of lattice reinforcement materials. After the penetration reinforcement joining process, a penetration reinforcement cutting process may be performed in which the penetration reinforcement materials are cut and divided into multiple penetration reinforcements. In this way, truss reinforcement with a configuration in which two lattice reinforcements are joined to the main reinforcement via penetration reinforcements can be manufactured more efficiently. The penetration reinforcement cutting process may be performed before the lattice reinforcement bending process or after the lattice reinforcement bending process. If the penetration reinforcement cutting process is performed after the lattice reinforcement bending process, multiple pairs of lattice reinforcement materials should be bent simultaneously in the lattice reinforcement bending process.

[0017] Furthermore, in the above-described manufacturing method, the penetrating reinforcing bar may have a rod-shaped main part that is joined to the bent portion of the lattice reinforcing bar and a bent end formed at one end of the main part. A penetrating reinforcing bar with a bent end formed in advance may be joined to the lattice reinforcing bar material in the penetrating reinforcing bar joining process. Alternatively, a rod-shaped penetrating reinforcing bar material may be joined to the lattice reinforcing bar material in the penetrating reinforcing bar joining process, and a penetrating reinforcing bar bending process may be performed after the penetrating reinforcing bar joining process to bend the penetrating reinforcing bar material. In the case where multiple lattice reinforcing bar materials are arranged in parallel in the penetrating reinforcing bar joining process, and penetrating reinforcing bars of a length that intersects with the multiple lattice reinforcing bar materials are joined to each of the multiple lattice reinforcing bar materials, and a penetrating reinforcing bar cutting process is performed after the penetrating reinforcing bar joining process to cut the penetrating reinforcing bars and divide them into multiple penetrating reinforcing bars, the penetrating reinforcing bar bending process is performed after the penetrating reinforcing bar cutting process. Furthermore, even when, in the penetration reinforcement joining process, multiple pairs of lattice reinforcement materials are arranged in parallel, and penetration reinforcement materials of a length that intersects with multiple pairs of lattice reinforcement materials are joined to each of the multiple pairs of lattice reinforcement materials, and a penetration reinforcement cutting process is performed after the penetration reinforcement joining process to cut the penetration reinforcement materials and divide them into multiple penetration reinforcements, the penetration reinforcement bending process is performed after the penetration reinforcement cutting process. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide truss reinforcement suitable for the construction of structures using a construction 3D printer, a method for constructing structures using the same, and a method for manufacturing truss reinforcement. Furthermore, in the connection between the lattice reinforcement and the main reinforcement, by using penetrating reinforcement, it is possible to create a structure that does not require welding or does not rely on weld strength even if welding is performed, thereby effectively utilizing the strength and elongation properties of the truss reinforcement as a base material. [Brief explanation of the drawing]

[0019] [Figure 1] A perspective view showing a truss reinforcement bar and its manufacturing method according to the first embodiment of the present invention. [Figure 2] A perspective view showing an enlarged view of the bent portion of the lattice reinforcement and its surrounding area in the truss reinforcement. [Figure 3] A flowchart showing the manufacturing process of the truss reinforcement bars. [Figure 4] Side view schematically showing the configuration of a bending device used in the lattice bar bending process [Figure 5] Side view schematically showing an enlarged configuration of the bender of the bending device [Figure 6] Perspective view schematically showing the construction method of the structure of the first embodiment [Figure 7] Flowchart showing the construction process of the structure [Figure 8] Perspective view showing the manufacturing method of the truss bar of the second embodiment of the present invention [Figure 9] Flowchart showing the manufacturing process of the truss bar [Figure 10] Perspective view showing the truss bar of the third embodiment of the present invention and its manufacturing method [Figure 11] Perspective view showing an enlarged view of the bent portion of the lattice bar in the truss bar and its surroundings [Figure 12] Perspective view showing the manufacturing method of the truss bar of the fourth embodiment of the present invention [Figure 13] Perspective view showing the truss bar of the fifth embodiment of the present invention and its manufacturing method [Figure 14] Perspective view showing an enlarged view of the bent portion of the lattice bar in the truss bar and its surroundings [Figure 15] Perspective view showing the truss bar of the sixth embodiment of the present invention and its manufacturing method [Figure 16] Perspective view showing an enlarged view of the bent portion of the lattice bar in the truss bar and its surroundings [Figure 17] Flowchart showing the manufacturing process of the truss bar

Mode for Carrying Out the Invention

[0020] A first embodiment of the present invention relates to a truss reinforcement bar 10 shown in Figures 1 and 2. The truss reinforcement bar 10 includes a zigzag-shaped lattice reinforcement bar 12, a plurality of penetrating reinforcement bars 14 arranged in contact with the inside of the bent portion of the lattice reinforcement bar 12 and in a direction intersecting the lattice reinforcement bar 12, and a rod-shaped main reinforcement bar 16 arranged in contact with the penetrating reinforcement bars 14 and the lattice reinforcement bar 12 on the opposite side of the penetrating reinforcement bars 14 from the side that contacts the bent portion of the lattice reinforcement bar 12. All of the plurality of penetrating reinforcement bars 14 protrude from the lattice reinforcement bar 12 so that they can be pierced and embedded in a mortar layer formed by a construction 3D printer.

[0021] The lattice bars 12, penetration bars 14, and main bars 16 are reinforcing bars such as deformed steel bars. Preferably, the penetration bars 14 have a larger diameter than the lattice bars 12. For example, the lattice bars 12 are D4 deformed steel bars, and the penetration bars 14 are D5, D6, or D10 deformed steel bars. The penetration bars 14 may also be bars with the same diameter as the lattice bars 12. Alternatively, the penetration bars 14 may be bars thinner than the lattice bars 12. The main bars 16 have a larger diameter than the lattice bars 12. Alternatively, the main bars 16 may be bars with the same diameter as the lattice bars 12. Alternatively, the main bars 16 may be bars thinner than the lattice bars 12. Preferably, at least one of the penetration bars 14 and the main bars 16 is attached to the lattice bars 12 by means of adhesive, for example, rather than by welding.

[0022] Next, the effects of the truss reinforcement 10 will be explained. Compressive or tensile forces are generated in the diagonal members, which are constituent members of the truss structure wall. When the truss reinforcement 10 is used in a truss structure wall, and tensile forces are generated in the diagonal members of the truss structure wall, causing the mortar to crack, a tensile force may act on the lattice reinforcement 12. Since the truss reinforcement 10 is constructed in which the main reinforcement 16 and the lattice reinforcement 12 are connected via the penetrating reinforcement 14, when a tensile force is applied to the lattice reinforcement 12, the lattice reinforcement 12 is supported by the main reinforcement 16 via the penetrating reinforcement 14, regardless of the strength of the connection between the main reinforcement 16 and the penetrating reinforcement 14 and / or the lattice reinforcement 12. Therefore, the strength expected from the strength of the main reinforcement 16 and the lattice reinforcement 12 can be reliably obtained. Furthermore, when a compressive force is applied to the lattice reinforcement 12, the compressive force is borne by the mortar in which the truss reinforcement 10 is embedded, and the lattice reinforcement 12 is not required to bear any compressive force in the design. In addition, since the penetrating reinforcement 14 extends in the vertical direction perpendicular to the boundary of the mortar layer, a reinforcing effect is obtained that prevents peeling and relative sliding at the boundary of the mortar layer. Furthermore, since the penetrating reinforcement 14 is embedded in the upper and lower mortar layers, the effect of suppressing the warping of the truss reinforcement 10 is also obtained. Moreover, since the penetrating reinforcement 14 extending in the vertical direction is also placed when the truss reinforcement 10 is laid in the mortar layer, the work of placing other reinforcement extending in the vertical direction is unnecessary, making the reinforcement work easy. In addition, since multiple penetrating reinforcement 14 protrude from the lattice reinforcement 12 so that they can be thrust into and embedded in the mortar layer formed by the construction 3D printer, the penetrating reinforcement 14 can be reliably embedded in the mortar layer, making it easy to lay them in the mortar layer.

[0023] Furthermore, if both the penetrating reinforcement bars 14 and the main reinforcement bars 16 are firmly welded to the lattice reinforcement bars 12, when an external force is applied, the deformation of the main reinforcement bars 16 and lattice reinforcement bars 12 at or near the welds will be suppressed, which could be a cause of fracture of these members. In contrast, if the penetrating reinforcement bars 14 and / or the main reinforcement bars 16 are not welded to the lattice reinforcement bars 12, the main reinforcement bars 16 and lattice reinforcement bars 12 will be more susceptible to tensile deformation, thus suppressing the fracture of these members. Moreover, since the main reinforcement bars 16 and the lattice reinforcement bars 12 are connected via the penetrating reinforcement bars 14, even if the penetrating reinforcement bars 14 and / or the main reinforcement bars 16 are not welded to the lattice reinforcement bars 12, the lattice reinforcement bars 12 are reliably supported by the main reinforcement bars 16 via the penetrating reinforcement bars 14. Furthermore, the construction of the truss reinforcement 10 is simplified by omitting the welding of the penetration reinforcement 14 and / or main reinforcement 16 to the lattice reinforcement 12. This also simplifies the manufacturing of the truss reinforcement 10 and contributes to improved productivity.

[0024] Next, a method for manufacturing the truss reinforcement 10 will be described. As shown in Figures 1 and 3, the manufacturing method of the truss reinforcement 10 of the first embodiment includes a penetration reinforcement joining step (S102) in which a plurality of penetration reinforcements 14 are alternately arranged on a rod-shaped lattice reinforcement material 12A at predetermined intervals along its longitudinal direction, intersecting the lattice reinforcement material 12A, and adjacent penetration reinforcements 14 are in contact with the opposite side surface of the lattice reinforcement material 12A, thereby joining the penetration reinforcements 14 to the lattice reinforcement material 12A, and a bending step (S102) in which the lattice reinforcement material 12A is bent at the joint with the penetration reinforcements 14 so that the penetration reinforcements 14 are on the inside, forming a zigzag shape. The method includes a lattice reinforcing bar bending step (S104) to obtain a lattice reinforcing bar 12, and a main reinforcing bar joining step (S106) to position a rod-shaped main reinforcing bar 16 on the side of the penetrating reinforcing bar 14 opposite to the side in contact with the bent portion of the lattice reinforcing bar 12, so as to contact the penetrating reinforcing bar 12 and the lattice reinforcing bar 12, and to join it to at least one of the penetrating reinforcing bar 14 and the lattice reinforcing bar 16, thereby manufacturing a truss reinforcing bar 10 in which multiple penetrating reinforcing bars 14 protrude from the lattice reinforcing bar 12 so that they can be thrust into and embedded in a mortar layer formed by a construction 3D printer.

[0025] In the penetration reinforcement joining process (S102), the penetration reinforcement bars 14 are joined to the lattice reinforcement material 12A at positions corresponding to the bent portions of the lattice reinforcement bars 12. The lattice reinforcement material 12A is a straight reinforcement bar. The penetration reinforcement bars 14 are arranged alternately on one side and the other side of the lattice reinforcement material 12A so as to be installed inside the bent portions of the lattice reinforcement bars 12, and are joined to the lattice reinforcement material 12A. In addition, the penetration reinforcement bars 14 are joined to the lattice reinforcement material 12A so as to be perpendicular to the lattice reinforcement material 12A. The penetration reinforcement bars 14 are joined to the lattice reinforcement material 12A by spot welding, arc welding, adhesive, etc. It is preferable that the penetration reinforcement bars 14 are joined to the lattice reinforcement material 12A by adhesive, etc., rather than by welding. Furthermore, when the penetrating reinforcing bars 14 are welded to the lattice reinforcing bar material 12A, it is preferable to weld them using spot welding, which has a weaker joint strength than arc welding.

[0026] In the lattice rebar bending process (S104), the lattice rebar material 12A is bent at the joint with the penetration rebar 14 by the bending device 20 shown in Figure 4 so that the penetration rebar 14 faces inward. The bending device 20 has three benders 22. The three benders 22 are driven by actuators (not shown) and are movable as shown in Figure 4. As shown in an enlarged view in Figure 5, each bender 22 is equipped with two outer jigs 24 and one inner jig 26. The outer jigs 24 are cylindrical in shape. The two outer jigs 24 are installed on the bender 22 at a predetermined interval so as to contact the lattice rebar material 12A from the side corresponding to the outside of the bent portion of the lattice rebar 12. The inner jig 26 is also cylindrical and is installed on the bender 22 between the two outer jigs 24 so as to contact the lattice rebar material 12A from the side corresponding to the inside of the bent portion of the lattice rebar 12. Furthermore, the inner jig 26 is installed in the bender 22 so as to be movable between a reference position that sandwiches the straight lattice reinforcing bar material 12A together with the two outer jigs 24 and a bending position that fits between the two outer jigs 24 and bends the lattice reinforcing bar material 12A. The inner jig 26 has an outer circumference that corresponds to the inner circumference shape of the bent portion of the lattice reinforcing bar 12, and a recess 26A for accommodating the penetrating reinforcing bar 14 is formed in the outer circumference. When the lattice reinforcing bar material 12A is bent with one bender while being fed along its longitudinal direction, the portion of the lattice reinforcing bar material 12A that has passed through the bender will tilt and swing from the feeding direction along the longitudinal direction of the lattice reinforcing bar material 12A each time the downstream portion is bent. In contrast, the bending apparatus 20 is configured to have three benders 22, so that the lattice reinforcing bar material 12A after bending does not tilt and swing from the feeding direction along the longitudinal direction of the lattice reinforcing bar material 12A. Therefore, it contributes to saving space in the equipment. Depending on the circumstances of the equipment, the bending apparatus may be configured to have one or two benders. Also, the inner jig 26 may have a shape other than a cylinder, as long as the outer part has a shape that corresponds to the inner circumference shape of the bent part of the lattice reinforcing bar 12. Also, the outer jig 24 may have a shape other than a cylinder. Furthermore, the outer jig 24 may be fixedly installed on the bender 22 or may be rotatably installed on the bender 22.Alternatively, the bender may be configured such that the inner jig is fixed, and the outer jig is movable between a reference position where it clamps the straight lattice reinforcing bar material 12A and a bending position where it bends the lattice reinforcing bar material 12A.

[0027] In the main reinforcement joining process (S106), the main reinforcement bars 16 are positioned along the inner side of the multiple penetrating reinforcement bars 14 (the side opposite to the side in contact with the bent portion of the lattice reinforcement bars 12), and joined to the penetrating reinforcement bars 14 by spot welding, arc welding, adhesive, etc. The main reinforcement bars 16 may also be joined to the lattice reinforcement bars 12. Furthermore, the main reinforcement bars 16 may be joined to both the lattice reinforcement bars 12 and the penetrating reinforcement bars 14. Similar to the penetrating reinforcement bars 14, it is preferable that the main reinforcement bars 16 are joined to the lattice reinforcement bar material 12A and / or the penetrating reinforcement bars 14 by adhesive, etc., rather than by welding. Also, if the main reinforcement bars 16 are welded to the lattice reinforcement bar material 12A and / or the penetrating reinforcement bars 14, it is preferable to weld them using spot welding, which has a weaker joining force than arc welding. This completes the truss reinforcement bar 10. According to the above method for manufacturing the truss reinforcement 10, a truss reinforcement 10 in which the main reinforcement 16 and the lattice reinforcement 12 are connected via the penetrating reinforcement 14 can be easily and efficiently manufactured.

[0028] Next, a construction method for a structure using truss reinforcement bars 10 will be described. As shown in Figures 6 and 7, first, mortar is supplied in layers in a predetermined pattern from the nozzle 32 of the construction 3D printer 30 to form a lower mortar layer 34 (S112). Next, the truss reinforcement bars 10 are laid on top of the lower mortar layer 34 (S114). Then, mortar is supplied in layers from the nozzle 32 onto the truss reinforcement bars 10 and the lower mortar layer 34 to form an upper mortar layer 36 (S116). If necessary, further mortar layers are formed to complete a truss structure wall that conforms to the shape of the truss reinforcement bars 10. As described above, since multiple penetrating reinforcing bars 14 protrude from the lattice reinforcing bars 12 so that they can be pierced and embedded into the mortar layer formed by the construction 3D printer, when the truss reinforcing bars 10 are laid on the lower mortar layer 34 in the truss reinforcing bar laying process (S114), all of the penetrating reinforcing bars 14 are reliably embedded in the lower mortar layer 34. Although Figure 6 shows an example in which the truss reinforcing bars 10 are laid between the third mortar layer from the bottom (lower mortar layer 34) and the fourth mortar layer from the bottom (upper mortar layer 36), the laying position of the truss reinforcing bars 10 can be appropriately selected according to the required reinforcement strength. For example, the truss reinforcing bars 10 may be laid at the boundaries of all mortar layers. Alternatively, the truss reinforcing bars 10 may be laid every two, three, four, or five layers. Furthermore, the structure on which the truss reinforcement 10 is laid is not limited to a truss structure wall with a shape that conforms to the shape of the truss reinforcement 10. For example, the truss reinforcement 10 can be applied to solid structures in the shape of a flat plate or rectangular parallelepiped, or to hollow structures in the shape of a flat plate or rectangular parallelepiped. In addition, the truss reinforcement 10 can be applied to various other shapes of structures. In the case of a hollow structure, a part of the truss reinforcement 10 may be exposed from the mortar, but it is preferable that the bent portion of the lattice reinforcement 12 on which the penetrating reinforcement 14 is installed is placed within the mortar.

[0029] Next, a second embodiment of the present invention will be described. The second embodiment relates to a manufacturing method that can manufacture truss reinforcement bars 10 more efficiently. In the second embodiment, as shown in Figures 8 and 9, in the penetration reinforcement joining process (S102), a plurality of lattice reinforcement materials 12A are arranged in parallel, and rod-shaped penetration reinforcement materials 14A with a length that intersects with the plurality of lattice reinforcement materials 12A are joined to each of the plurality of lattice reinforcement materials 12A. After the penetration reinforcement joining process (S102), a penetration reinforcement cutting process (S202) is performed in which the penetration reinforcement materials 14A are cut and divided into a plurality of penetration reinforcement bars 14. Other components are the same as in the first embodiment, so the same reference numerals are used for common components as in the first embodiment and their description is omitted. According to the second embodiment, truss reinforcement bars 10 in which the main reinforcement bars 16 and lattice reinforcement bars 12 are joined via penetration reinforcement bars 14 can be manufactured more efficiently. The penetration rebar cutting process (S202) may be performed after the lattice rebar bending process (S104). In this case, multiple lattice rebar materials 12A are bent simultaneously in the lattice rebar bending process (S104).

[0030] Next, a third embodiment of the present invention will be described. The third embodiment relates to a truss reinforcement 40 shown in Figures 10 and 11. The truss reinforcement 40 is provided with two lattice reinforcements 12 arranged in parallel, a penetrating reinforcement 14 is arranged across the two lattice reinforcements 12, and a main reinforcement 16 is sandwiched between the two lattice reinforcements and is arranged in contact with the penetrating reinforcement 14 and the two lattice reinforcements 12. The other components are the same as those of the truss reinforcement 10 of the first embodiment, so the same reference numerals are used for the common components as in the first embodiment and their description will be omitted.

[0031] Next, the effects of the truss reinforcement 40 will be explained. The truss reinforcement 40, which has two lattice reinforcements 12, is therefore stronger and has a greater reinforcing effect on the structure. In addition, since the two lattice reinforcements 12 are configured to engage with the penetrating reinforcements 14 on both sides of the main reinforcement 16, when a tensile force is applied to the lattice reinforcements 12, it is less likely that a force will be generated that tilts the penetrating reinforcements 14, and in this respect as well, the truss reinforcement 40 has high strength and a high reinforcing effect on the structure. Furthermore, by laying the truss reinforcement 40 so that one lattice reinforcement 12 is placed in the layer on one side of the boundary of the mortar layer and the other lattice reinforcement 12 is placed in the layer on the other side of the boundary, the reinforcing effect that prevents peeling and relative sliding at the boundary of the mortar layer can also be enhanced.

[0032] Next, a method for manufacturing the truss reinforcement 40 will be described. In the third embodiment, in the penetration reinforcement joining process (S102), two lattice reinforcement materials 12A are arranged in parallel with only enough space to sandwich one main reinforcement 16, in the lattice reinforcement bending process (S104), the two lattice reinforcement materials 12A are bent simultaneously, and in the main reinforcement joining process (S106), the main reinforcement 16 is placed between the two lattice reinforcements 12 and joined to the penetration reinforcement 14 and at least one of the two lattice reinforcements 12. This makes it possible to efficiently manufacture a truss reinforcement 40 in which the two lattice reinforcements 12 are connected to the main reinforcement 16 via the penetration reinforcement 14.

[0033] Next, a fourth embodiment of the present invention will be described. The fourth embodiment relates to a manufacturing method that can manufacture truss reinforcement bars 40 more efficiently. In the fourth embodiment, as shown in Figure 12, in the penetration reinforcement joining process (S102), a plurality of pairs of lattice reinforcement materials 12A are arranged in parallel, and penetration reinforcement materials 14A of a length that intersects with the plurality of pairs of lattice reinforcement materials are joined to each of the plurality of pairs of lattice reinforcement materials. After the penetration reinforcement joining process (S102), a penetration reinforcement cutting process (S202) is performed in which the penetration reinforcement materials 14A are cut and divided into a plurality of penetration reinforcement bars 14, as in the second embodiment. Other components are common to the first to third embodiments, so the same reference numerals are used for common components as in the first to third embodiments, and their description is omitted. According to the fourth embodiment, truss reinforcement bars 40 in which two lattice reinforcement bars 12 are connected to the main reinforcement bars 16 via penetration reinforcement bars 14 can be manufactured more efficiently. The penetration rebar cutting process (S202) may be performed after the lattice rebar bending process (S104). In this case, multiple pairs of lattice rebar materials 12A are bent simultaneously in the lattice rebar bending process (S104).

[0034] Next, a fifth embodiment of the present invention will be described. The fifth embodiment relates to a truss reinforcement 50 as shown in Figures 13 and 14. The truss reinforcement 50 comprises two pairs of main reinforcements 16. The two main reinforcements 16 of each pair are arranged to sandwich the lattice reinforcement 12 and to contact the side of the penetrating reinforcement 14 opposite to the side that contacts the bent portion of the lattice reinforcement 12. Other components are the same as those of the first embodiment, so the same reference numerals as in the first embodiment will be used for common components and their description will be omitted. Since the truss reinforcement 50 comprises two pairs of main reinforcements 16, its strength is higher and the reinforcing effect of the structure can be enhanced. Furthermore, since the two main reinforcements 16 of each pair engage with the penetrating reinforcement 14 on both sides of the lattice reinforcement 12, when a tensile force is applied to the lattice reinforcement 12, a force that tilts the penetrating reinforcement 14 is less likely to occur, and in this respect as well, the strength of the truss reinforcement 50 and the reinforcing effect of the structure can be enhanced. Furthermore, by laying the truss reinforcement 50 such that one main reinforcement 16 is placed in the layer on one side of the boundary of the mortar layers and the other main reinforcement 16 is placed in the layer on the other side of the boundary, the reinforcing effect that prevents peeling and relative sliding at the boundary of the mortar layers can be enhanced. In addition, since multiple penetrating reinforcement bars 14 protrude from the lattice reinforcement 12 so that they can be thrust into and embedded in the mortar layer formed by the construction 3D printer, the penetrating reinforcement bars 14 can be reliably embedded in the mortar layer, making it easy to lay them in the mortar layer.

[0035] Next, a method for manufacturing the truss reinforcement 50 will be described. Similar to the first embodiment, the penetration reinforcement joining process (S102) and the lattice reinforcement bending process (S104) are performed, and in the main reinforcement joining process (S106), the main reinforcement 16 is placed on both sides of the lattice reinforcement 12 and joined to at least one of the penetration reinforcement 14 and the lattice reinforcement 12. This makes it possible to efficiently manufacture a truss reinforcement 50 in which two pairs of main reinforcement 16 are connected to the lattice reinforcement 12 via the penetration reinforcement 14. In addition, similar to the second embodiment, in the penetration reinforcement joining process (S102), multiple lattice reinforcement materials 12A are arranged in parallel, and penetration reinforcement materials 14A of a length that intersects with the multiple lattice reinforcement materials 12A are joined to each of the multiple lattice reinforcement materials 12A, the penetration reinforcement cutting process (S202) and the lattice reinforcement bending process (S104) are performed, and in the main reinforcement joining process (S106), the main reinforcement 16 is arranged on both sides of the lattice reinforcement 12 and joined to at least one of the penetration reinforcement 14 and the lattice reinforcement 12. This makes it possible to manufacture truss reinforcement 50 with a configuration in which two pairs of main reinforcement 16 are joined to the lattice reinforcement 12 via the penetration reinforcement 14 even more efficiently.

[0036] Next, a sixth embodiment of the present invention will be described. The sixth embodiment relates to a truss reinforcement 60 as shown in Figures 15 and 16. Compared to the truss reinforcement 10 of the first embodiment, the truss reinforcement 60 is configured to have a penetration reinforcement 66 having a rod-shaped main part 62 and a bent end 64 formed at one end of the main part 62, instead of the penetration reinforcement 14. Other components are common to the truss reinforcement 10 of the first embodiment, so the same reference numerals as in the first embodiment will be used for common components and their description will be omitted. The bent end 64 is rod-shaped and perpendicular to the main part 62, and the penetration reinforcement 66 is L-shaped. The main part 62 is arranged in a direction that intersects with the lattice reinforcement 12, touching the inside of the bent portion of the lattice reinforcement 12. Since the bent end 64 is formed at one end of the penetration reinforcement 66, the truss reinforcement 60 has a high reinforcing effect on the structure. More specifically, the bent portion 64 functions as a so-called right-angle hook to anchor the reinforcing bar, thereby preventing or suppressing the separation (delamination) between layers and increasing the interlayer strength. When laying the truss reinforcing bar 60 in the mortar layer, it is preferable to lay the truss reinforcing bar 60 in the mortar layer so that the bent end portion 64 faces upward. The bent end portion 64 may be arc-shaped and the penetrating reinforcing bar 66 may be J-shaped. The bent end portion 64 may also be formed at both ends of the penetrating reinforcing bar 66. Furthermore, for the truss reinforcing bars 40 and 50 of the third or fifth embodiment, the penetrating reinforcing bar 14 may be replaced with a penetrating reinforcing bar 66 having a bent end portion 64.

[0037] Next, a method for manufacturing the truss reinforcement 60 will be described. As shown in Figures 15 and 17, in the sixth embodiment, in the penetration reinforcement joining process (S102), a plurality of rod-shaped penetration reinforcement materials 66A are joined to the lattice reinforcement material 12, and after the penetration reinforcement joining process (S102), a penetration reinforcement bending process (S302) is performed in which one end of the penetration reinforcement material 66A is bent to form a penetration reinforcement 66 having a main part 62 and a bent end 64. Note that, as in the second embodiment, when a plurality of lattice reinforcement materials 12 are arranged in parallel in the penetration reinforcement joining process (S102) and penetration reinforcement materials 66A of a length that intersects with the plurality of lattice reinforcement materials 12A are joined to each of the plurality of lattice reinforcement materials 12A, the penetration reinforcement bending process (S302) is performed after the penetration reinforcement cutting process (S202). Furthermore, as in the fourth embodiment, when multiple pairs of lattice reinforcing bar materials 12A are arranged in parallel in the penetration reinforcing bar joining process (S102) and penetration reinforcing bar materials 66A of a length that intersects with the multiple pairs of lattice reinforcing bar materials 12A are joined to each of the multiple lattice reinforcing bar materials 12A, the penetration reinforcing bar bending process (S302) is performed after the penetration reinforcing bar cutting process (S202). Also, as in the first and third embodiments, when a penetration reinforcing bar is joined to one or one pair of lattice reinforcing bar materials 12A in the penetration reinforcing bar joining process (S102), a penetration reinforcing bar 66 with a pre-formed bent end 64 may be joined to the lattice reinforcing bar material 12A in the penetration reinforcing bar joining process (S102). [Industrial applicability]

[0038] This invention can be used in the construction of structures using a 3D printer for construction. [Explanation of symbols]

[0039] 10, 40, 50, 60 truss reinforcement bars 12 Lattice Reinforcement Bars 12A Lattice Reinforcement Material 14, 66 Penetrating reinforcing bars 14A, 66A Penetrating Reinforcement Bar Material 16 Main reinforcing bars 20 Processing equipment 22 Vendors 24 Outside jig 26 Internal fixture 26A Recess 30 Construction 3D Printers 32 nozzles 34 Lower mortar layer 36 Upper mortar layer 62 Main part 64 Folded end S102 Penetration Reinforcement Joining Process S104 Lattice Reinforcement Bending Process S106 Main reinforcement bar joining process S112 Lower mortar layer formation process S114 Truss Reinforcement Laying Process S116 Upper mortar layer formation process S202 Penetration Reinforcement Cutting Process S302 Penetration and Bending Process

Claims

1. Zigzag-shaped lattice reinforcement, Multiple penetrating reinforcing bars are arranged in contact with the inside of the bent portion of the lattice reinforcing bar and in a direction that intersects with the lattice reinforcing bar, A truss reinforcement comprising a rod-shaped main reinforcement positioned in contact with the penetrating reinforcement and the lattice reinforcement on the opposite side of the penetrating reinforcement that is in contact with the bent portion of the lattice reinforcement.

2. In claim 1, Two of the aforementioned lattice reinforcing bars are provided and arranged in parallel, The aforementioned penetrating reinforcement is arranged across two of the aforementioned lattice reinforcement bars. The main reinforcement is sandwiched between two lattice reinforcement bars and is a truss reinforcement bar positioned in contact with the penetrating reinforcement bar and the two lattice reinforcement bars.

3. In claim 1, The aforementioned penetrating reinforcement is a truss reinforcement having a rod-shaped main part positioned in contact with the bent portion of the lattice reinforcement and a bent end formed at one end of the main part.

4. In claim 1, A truss reinforcement in which at least one of the penetration reinforcement and the main reinforcement is attached to the lattice reinforcement without welding.

5. A lower mortar layer formation process involves supplying mortar in layers from the nozzle of a construction 3D printer to form a lower mortar layer, A truss reinforcement laying step of laying a truss reinforcement according to any one of claims 1 to 4 on the lower mortar layer, A method for constructing a structure, comprising: an upper mortar layer formation step, in which mortar is supplied in layers from the nozzle onto the truss reinforcement and the lower mortar layer to form an upper mortar layer.

6. A penetration reinforcing bar joining process in which multiple penetration reinforcing bars are alternately arranged on a rod-shaped lattice reinforcing bar material at predetermined intervals along its longitudinal direction, intersecting the lattice reinforcing bar material, and adjacent penetration reinforcing bars are in contact with the opposite side surface of the lattice reinforcing bar material, thereby joining the penetration reinforcing bars to the lattice reinforcing bar material, A lattice reinforcing bar bending process is performed to obtain a zigzag-shaped lattice reinforcing bar by bending the lattice reinforcing bar material at the joint with the penetrating reinforcing bar so that the penetrating reinforcing bar faces inward, A method for manufacturing a truss reinforcement, comprising: a main reinforcement joining step of arranging a rod-shaped main reinforcement so as to be in contact with the penetrating reinforcement and the lattice reinforcement on the side opposite to the side of the penetrating reinforcement that is in contact with the bent portion of the lattice reinforcement; and joining the main reinforcement to at least one of the penetrating reinforcement and the lattice reinforcement.

7. In claim 6, A method for manufacturing a truss reinforcing bar, comprising bringing a jig, which has an outer circumference shaped to correspond to the inner circumference shape of the bent portion of the lattice reinforcing bar and has a recess for accommodating the penetrating reinforcing bar formed on the outer circumference, into contact with the lattice reinforcing bar material in the lattice reinforcing bar bending process, and bending the lattice reinforcing bar material.

8. In claim 6 or 7, In the aforementioned penetration reinforcement joining process, a plurality of the lattice reinforcement materials are arranged in parallel, and rod-shaped penetration reinforcement materials of a length that intersects with the plurality of lattice reinforcement materials are joined to each of the plurality of lattice reinforcement materials. A method for manufacturing truss reinforcement, comprising performing a penetration reinforcement cutting step after the penetration reinforcement joining step, in which the penetration reinforcement material is cut and divided into multiple penetration reinforcements.

9. In claim 6 or 7, In the aforementioned penetration reinforcement joining process, two lattice reinforcement materials are arranged parallel to each other with an interval that is just enough to sandwich one main reinforcement, In the lattice reinforcing bar bending process, two of the lattice reinforcing bar materials are bent simultaneously. A method for manufacturing a truss reinforcement, comprising arranging the main reinforcement between two of the lattice reinforcement bars in the main reinforcement joining step and joining it to the penetration reinforcement and at least one of the two of the lattice reinforcement bars.

10. In claim 6 or 7, A method for manufacturing a truss reinforcement, wherein the penetrating reinforcement has a rod-shaped main part that is joined to the bent portion of the lattice reinforcement and a bent end formed at one end of the main part.

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