Reinforcing wire of cement shaped article

Abstract

To provide a cement shaped article 2 having excellent strength.SOLUTION: A cement shaped article has a first cement hardened layer 4a, a second cement hardened layer 4b, a third cement hardened layer 4c and a fourth cement hardened layer 4d. The cement shaped article further has a first reinforcing wire 6a, a second reinforcing wire 6b and a third reinforcing wire 6c. The first reinforcing wire 6a is positioned at a boundary between the first cement hardened layer 4a and the second cement hardened layer 4b. The second reinforcing wire 6b is positioned at a boundary between the second cement hardened layer 4b and the third cement hardened layer 4c. The third reinforcing wire 6c is positioned at a boundary between the third cement hardened layer 4c and the fourth cement hardened layer 4d. Each reinforcing wire 6 is preformed. The reinforcing wire has a width Wr larger than a height Hr.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present specification discloses a reinforcing wire suitable for additive manufacturing of cement objects. [Background technology]

[0002] The formwork method is known as a method of constructing reinforced concrete structures. In this method, reinforcing bars are first inserted into a formwork. Ready-mixed concrete is then poured into the formwork. Once the ready-mixed concrete hardens, the structure is completed. The reinforcing bars become integrated with the concrete. The reinforcing bars reinforce the structure.

[0003] A building structure can also be obtained by a three-dimensional additive manufacturing method. In the three-dimensional additive manufacturing method, a cement composition is extruded from a moving nozzle. In order to avoid interference with the nozzle, rebars cannot be used in this manufacturing method. Reinforcement by rebars cannot be used in this building structure.

[0004] JP 2022-046028 A discloses a reinforcing material suitable for a molded object obtained by a three-dimensional additive manufacturing method. The reinforcing material is supplied from a nozzle that extrudes a cement composition. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2022-046028 Summary of the Invention [Problem to be solved by the invention]

[0006] The reinforcing performance of the reinforcing material disclosed in JP 2022-046028 A is insufficient. The present applicant intends to provide a cement-based object having excellent strength. [Means for solving the problem]

[0007] The reinforcing wires of the cementitious object disclosed herein are pre-shaped, with the width Wr being greater than the height Hr.

[0008] The present specification discloses a cement shaped article. First cement hardened layer, a second hardened cement layer laminated on the first hardened cement layer; and A reinforcing wire that is embedded in the first hardened cement layer or the second hardened cement layer and is formed, and whose width Wr is greater than its height Hr. It has.

[0009] The present specification discloses a method for producing a cement shaped object, A: A step of extruding a pre-shaped reinforcing wire having a width Wr greater than a height Hr and a first cement composition; B: extruding the second cement composition and layering it on the first cement composition; and C: A step of hardening the first cement composition and the second cement composition Includes. [Effects of the Invention]

[0010] The reinforcing wires increase the strength of the cementitious object. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a cement shaped object according to one embodiment. [Figure 2] FIG. 2 is a plan view showing the cement shaped object of FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] 5(a) is a plan view showing the reinforcing wires of the cement model of FIG. 2, and FIG. 5(b) is a front view thereof. [Figure 6] FIG. 6(a) is a plan view showing the reinforcing wire element of FIG. 5, and FIG. 6(b) is a front view thereof. [Figure 7] FIG. 7 is a front view showing an example of a method for manufacturing the cement model of FIG. [Figure 8] FIG. 8 is a plan view showing the hardened cement product obtained by the manufacturing method of FIG. [Figure 9] FIG. 9 is a plan view showing a cement model according to another embodiment. [Figure 10] 10(a) is a plan view showing the reinforcing wires of the cement model of FIG. 9, and FIG. 10(b) is a front view thereof. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, preferred embodiments will be described in detail with reference to the drawings as appropriate.

[0013] 1-4 show a cement model 2. In each drawing, arrow X indicates the width direction of the model 2, arrow Y indicates the length direction of the model 2, and arrow Z indicates the height direction of the model 2.

[0014] This cement shaped object 2 has a plurality of hardened cement layers 4. FIGS. 1, 3, and 4 show a first hardened cement layer 4a, a second hardened cement layer 4b, a third hardened cement layer 4c, and a fourth hardened cement layer 4d. The second hardened cement layer 4b is layered on the first hardened cement layer 4a. The third hardened cement layer 4c is layered on the second hardened cement layer 4b. The fourth hardened cement layer 4d is layered on the third hardened cement layer 4c.

[0015] Each hardened cement layer 4 can be obtained by hardening a cement composition. Specific materials for the hardened cement layer 4 are concrete or mortar. The composition for the hardened cement layer 4 made of concrete is ready-mixed concrete. This ready-mixed concrete is a composition containing cement, aggregate, and water. The composition for the hardened cement layer 4 made of mortar is ready-mixed mortar. This ready-mixed mortar is a composition containing cement, fine aggregate, and water.

[0016] The cementitious object 2 further includes a plurality of reinforcing wires 6. FIGS. 3 and 4 show a first reinforcing wire 6a, a second reinforcing wire 6b, and a third reinforcing wire 6c. FIGS. 3 and 4 show the entire wires 6, not cross sections. The first reinforcing wire 6a is located at the boundary between the first hardened cement layer 4a and the second hardened cement layer 4b. In this embodiment, the first reinforcing wire 6a straddles the first hardened cement layer 4a and the second hardened cement layer 4b. The first reinforcing wire 6a may be embedded in either the first hardened cement layer 4a or the second hardened cement layer 4b. The second reinforcing wire 6b is located at the boundary between the second hardened cement layer 4b and the third hardened cement layer 4c. In this embodiment, the second reinforcing wire 6b straddles the second hardened cement layer 4b and the third hardened cement layer 4c. The second reinforcing wire 6b may be embedded in either the second hardened cement layer 4b or the third hardened cement layer 4c. The third reinforcing wire 6c is located at the boundary between the third hardened cement layer 4c and the fourth hardened cement layer 4d. In this embodiment, the third reinforcing wire 6c exists across both the third hardened cement layer 4c and the fourth hardened cement layer 4d. The third reinforcing wire 6c may be embedded in either the third hardened cement layer 4c or the fourth hardened cement layer 4d.

[0017] The preferred material for each reinforcing wire 6 is metal. Preferred metals include alloy steel such as stainless steel, carbon steel, and other iron-based alloys. The reinforcing wire 6 may have a coating such as a plating layer on its surface. The material for the reinforcing wire 6 may be synthetic resin, glass, or the like. The reinforcing wire 6 may be a single wire or an assembly of multiple wires. The assembly may be wrapped with a wrapping wire. The assembly may be a twisted wire. In the assembly, each wire may have a wave or spiral shape. The reinforcing wire 6 may be obtained by coiling a raw wire. The cross section of the raw wire is preferably circular. The cross section may be non-circular. Examples of non-circular shapes include ellipse, rectangle, and triangle. In this embodiment, the specifications of the second reinforcing wire 6b are the same as those of the first reinforcing wire 6a, and the specifications of the third reinforcing wire 6c are also the same as those of the first reinforcing wire 6a.

[0018] FIG. 5 shows a reinforcing wire 6. This reinforcing wire 6 is obtained by bending a raw wire. This reinforcing wire 6 has a coil shape. This reinforcing wire 6 has a plurality of elements 8. These elements 8 are arranged in the left-right direction of FIG. 5. Each element 8 is continuous with the adjacent other element 8.

[0019] FIG. 6 shows an element 8. This element 8 has a loop 10 and a joint 12. The joint 12 is continuous with the loop 10. The radius of curvature of the joint 12 is larger than the radius of curvature of the loop 10. In this embodiment, the shape of the joint 12 is straight. Therefore, the radius of curvature of the joint 12 is infinite. The shape of the joint 12 may be curved. The shape of the joint 12 may be a combination of multiple curves with different radii of curvature. The shape of the joint 12 may be a combination of a straight line and a curve.

[0020] As is clear from FIG. 5 , multiple loops 10 and multiple joints 12 are alternately arranged along the longitudinal direction of the reinforcing wire 6 (the left-right direction in FIG. 5 ). The joints 12 connect one loop 10 to another. Due to the presence of these joints 12, the axial direction Ax (see FIG. 5( b)) of the elements 8 is significantly inclined with respect to the longitudinal direction of the reinforcing wire 6. In this embodiment, the axial direction Ax is generally perpendicular to the longitudinal direction of the reinforcing wire 6. In this reinforcing wire 6, the width Wr is greater than the height Hr. The pitch Pe of the elements 8 is generally equal to the length Lj (see FIG. 6( a)) of the joints 12. Because the length Lj of the joints 12 is sufficiently large compared to the size of the loops 10, the loops 10 do not overlap with other loops 10 in a plan view ( FIG. 5( a)). This reinforcing wire 6 has excellent flexibility.

[0021] A method for manufacturing a wire having loops 10 and joints 12 is disclosed in Japanese Patent Application Laid-Open No. 2004-244788.

[0022] 2, a reinforcing wire 6 having a large width Wr can reinforce a wide area in the width direction X of the cementitious object 2. From the viewpoint of reinforcement, the ratio of the width Wr of the reinforcing wire 6 to the width Wc of the hardened cement layer 4 is preferably 40% or more, more preferably 60% or more, and particularly preferably 70% or more.

[0023] FIG. 7 shows a method for producing a cement shaped object 2. This figure shows a first cement composition 14a, a first reinforcing wire 6a, a second cement composition 14b, a second reinforcing wire 6b, and a nozzle 16. The nozzle 16 is part of a 3D printer. In FIG. 7, the second cement composition 14b is extruded from the nozzle 16. The second reinforcing wire 6b is also extruded from the nozzle 16. The second reinforcing wire 6b is extruded in a state where a portion of the second reinforcing wire 6b is embedded in the second cement composition 14b. The second reinforcing wire 6b may be extruded in a state where the entirety of the second reinforcing wire 6b is embedded in the second cement composition 14b. The second reinforcing wire 6b may be extruded from a nozzle different from the nozzle 16 for the second cement composition 14b.

[0024] As the nozzle 16 moves in the direction of arrow A1, the second cement composition 14b is extruded, and the second cement composition 14b is layered on the first cement composition 14a. The second cement composition 14b covers the first reinforcing wire 6a. Similarly, the cement compositions 14 are layered one after another.

[0025] The first hardened cement layer 4a (see FIG. 1) is obtained by hardening the first cement composition 14a. The second hardened cement layer 4b is obtained by hardening the second cement composition 14b. The second hardened cement layer 4b is integral with the first hardened cement layer 4a. Therefore, the boundary between the first hardened cement layer 4a and the second hardened cement layer 4b cannot be clearly seen. Because the cement composition 14 can flow, the height Hb (see FIG. 4) of the boundary between the first hardened cement layer 4a and the second hardened cement layer 4b is not constant. The first reinforcing wire 6a is located near the boundary between the first hardened cement layer 4a and the second hardened cement layer 4b. The first reinforcing wire 6a is embedded in both or either the first hardened cement layer 4a and the second hardened cement layer 4b.

[0026] This manufacturing method is also called 3D printing. This manufacturing method makes it possible to obtain a cement shaped object 2 that is reinforced with reinforcing wires 6 instead of rebars.

[0027] When the nozzle 16 moves in a straight line, a straight hardened cement layer 4 is formed. When the nozzle 16 moves in a curved line, a curved hardened cement layer 4 is formed. FIG. 8 shows a curved hardened cement layer 4. As described above, in the reinforcing wire 6, the loops 10 do not overlap with other loops 10. Therefore, the reinforcing wire 6 is flexible. As shown in FIG. 8, the reinforcing wire 6 follows the curvature of the hardened cement layer 4. The reinforcing wire 6 is also suitable for a curved cement model 2.

[0028] The cement composition 14 may contain a large number of short fibers dispersed in the matrix. These short fibers contribute to the strength of the cement shaped object 2. Because the cement shaped object 2 has the reinforcing wires 6, a small amount of short fibers is sufficient. A cement composition 14 containing little or no short fibers is less likely to clog the nozzle 16.

[0029] In Fig. 6, the arrow Dr indicates the wire diameter of the reinforcing wire 6. From the viewpoint of reinforcement, the wire diameter Dr is preferably 0.1 mm or more, more preferably 0.2 mm or more, and particularly preferably 0.3 mm or more. From the viewpoint of flexibility, the wire diameter Dr is preferably 2.0 mm or less, more preferably 1.5 mm or less, and particularly preferably 1.0 mm or less.

[0030] A coil having a small height Hr (see FIG. 5) is easily extruded from the nozzle 16. In this respect, the ratio of the height Hr to the width Wr is preferably equal to or less than 40%, more preferably equal to or less than 25%, and particularly preferably equal to or less than 15%.

[0031] The ratio of the pitch Pe to the width Wr is preferably 105% or more and 500% or less. Reinforcing wires 6 with this ratio of 105% or more have excellent flexibility. From this viewpoint, this ratio is more preferably 110% or more, and particularly preferably 115% or more. Reinforcing wires 6 with this ratio of 500% or less sufficiently reinforce the cementitious object 2. From this viewpoint, this ratio is more preferably 300% or less, and particularly preferably 200% or less.

[0032] 9 shows a cement shaped object 18 according to another embodiment. The object 18 includes a hardened cement layer 20 and a reinforcing wire 22. Although not shown, the cement shaped object 18 includes a plurality of hardened cement layers 20 and a plurality of reinforcing wires 22, similar to the object 18 shown in FIGS. 1-4. Each reinforcing wire 22 is located near the boundary between one hardened cement layer 20 and another adjacent hardened cement layer 20.

[0033] FIG. 10 shows a reinforcing wire 22. This reinforcing wire 22 is obtained by bending a raw wire. This reinforcing wire 22 has a wavy shape. In other words, this reinforcing wire 22 has a two-dimensional shape. This reinforcing wire 22 has a plurality of elements 24. The arrows Pe in FIG. 10 indicate the pitch of these elements 24. These elements 24 are aligned in the left-right direction of FIG. 10. Each element 24 is continuous with its adjacent element 24. In this reinforcing wire 22, its width Wr is greater than its height Hr. The material of this reinforcing wire 22 is the same as that of the reinforcing wire 6 shown in FIG. 5.

[0034] The reinforcing wires 22 have high tensile strength. Because the reinforcing wires 22 have a two-dimensional shape, the reinforcing wires 22 increase the strength of the cement model 18 in various directions. The cement model 18 has excellent strength.

[0035] 9, a reinforcing wire 22 having a large width Wr can reinforce a wide area in the width direction X of the cement model 18. From the viewpoint of reinforcement, the ratio of the width Wr of the reinforcing wire 22 to the width Wc of the hardened cement layer 20 is preferably 40% or more, more preferably 60% or more, and particularly preferably 70% or more.

[0036] A reinforcing wire 22 having a small height Hr (see FIG. 10) is easily extruded from the nozzle 16 (see FIG. 7). From this viewpoint, the ratio of the height Hr to the width Wr is preferably equal to or less than 40%, more preferably equal to or less than 25%, and particularly preferably equal to or less than 15%.

[0037] The width Wr of the reinforcing wire 22 corresponds to twice the amplitude of the wave. The pitch Pe is also the wavelength of the wave. The ratio of the pitch Pe to the width Wr is preferably 20% or more and 500% or less. A reinforcing wire 22 with this ratio of 20% or more has excellent flexibility. From this viewpoint, this ratio is more preferably 40% or more, and particularly preferably 50% or more. A reinforcing wire 22 with this ratio of 500% or less will sufficiently reinforce the hardened cement layer 20. From this viewpoint, this ratio is more preferably 300% or less, and particularly preferably 200% or less.

[0038] The reinforcing wire 22 can be obtained by stretching and squashing a coil. Alternatively, the reinforcing wire 22 may be obtained by locally applying plastic processing to a straight raw wire.

[0039] [Disclosure items] Each of the following sections discloses a preferred embodiment.

[0040] [Item 1] A reinforcing wire for a cement structure, which is bent and has a width Wr greater than its height Hr.

[0041] [Item 2] Item 2. The reinforcing wire according to item 1, wherein the ratio of the height Hr to the width Wr is 40% or less.

[0042] [Item 3] 3. The reinforcing wire according to item 1 or 2, having a coil shape.

[0043] [Item 4] It has a plurality of consecutive elements, Each element has a loop and a joint; Item 4. The reinforcing wire according to item 3, wherein the loops do not overlap with other loops in a plan view.

[0044] [Item 5] 5. The reinforcing wire according to item 4, wherein the ratio of the pitch Pe of the elements to the width Wr is 105% or more and 500% or less.

[0045] [Item 6] 3. The reinforcing wire according to item 1 or 2, having a wave shape.

[0046] [Item 7] 7. The reinforcing wire according to item 6, wherein the ratio of the pitch Pe of the corrugated shape to the width Wr is 20% or more and 500% or less.

[0047] [Item 8] First cement hardened layer, a second hardened cement layer laminated on the first hardened cement layer; and A reinforcing wire that is embedded in the first hardened cement layer or the second hardened cement layer and is formed, and whose width Wr is greater than its height Hr. A cement sculpture equipped with the above.

[0048] [Item 9] Item 9. A cement shaped object according to item 8, wherein a ratio of a width Wr of the reinforcing wire to a width Wc of the first hardened cement layer is 40% or more.

[0049] [Item 10] A: A step of extruding a pre-shaped reinforcing wire having a width Wr greater than a height Hr and a first cement composition; B: extruding the second cement composition and layering it on the first cement composition; and C: A step of hardening the first cement composition and the second cement composition A method for manufacturing a cement shaped object, comprising: [Industrial Applicability]

[0050] The reinforcing wire described above is suitable for various cement structures such as buildings, bridges, poles, tunnels, quays, etc. [Explanation of symbols]

[0051] 2. Cement sculpture 4. Hardened cement layer 4a First cement hardened layer 4b: Second cement hardened layer 4c Third cement hardened layer 4d...Fourth cement hardening layer 6. Reinforcing wire 6a First reinforcing wire 6b Second reinforcing wire 6c Third reinforcing wire 8 Elements 10 Loops 12... Joint 14. Cement composition 14a... First cement composition 14b... Second cement composition 16 Nozzle 18. Cement sculpture 20. Hardened cement layer 22 Reinforcing wire 24 Elements

Claims

1. A reinforcing wire for a cement molding, which is bent and has a width Wr greater than a height Hr.

2. The reinforcing wire according to claim 1 , wherein the ratio of the height Hr to the width Wr is 40% or less.

3. The reinforcing wire according to claim 1 or 2, having a coil shape.

4. It has a plurality of consecutive elements, Each element has a loop and a joint; The reinforcing wire according to claim 3 , wherein the loops do not overlap with other loops in a plan view.

5. The reinforcing wire according to claim 4 , wherein a ratio of the pitch Pe of the elements to the width Wr is equal to or greater than 105% and equal to or less than 500%.

6. 3. The reinforcing wire according to claim 1 or 2, which has a wave shape.

7. The reinforcing wire according to claim 6 , wherein a ratio of the pitch Pe of the corrugated shape to the width Wr is 20% or more and 500% or less.

8. First cement hardened layer, a second hardened cement layer laminated on the first hardened cement layer; and a reinforcing wire embedded in the first hardened cement layer or the second hardened cement layer and formed therein, the reinforcing wire having a width Wr greater than a height Hr; A cement sculpture equipped with the above.

9. 9. The cement shaped object according to claim 8, wherein a ratio of a width Wr of the reinforcing wire to a width Wc of the first hardened cement layer is 40% or more.

10. A: A step of extruding a pre-shaped reinforcing wire having a width Wr greater than a height Hr and a first cement composition; B: Extruding the second cement composition and layering it on the first cement composition; and C: Step of hardening the first cement composition and the second cement composition A method for manufacturing a cement shaped object, comprising:

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