Reinforcement for cement structures

Abstract

To provide a reinforcing body 6 that is flexible and can contribute to the high strength of cement-molded structures. [Solution] The reinforcing body 6 for cement molded objects has a bundle 10 containing a plurality of metal wires 8. Each metal wire 8 has a wave shape. The bundle 10 includes a first metal wire 8 and a second metal wire 8 whose phase is different from the phase of the curvature of the first metal wire 8. The bundle includes a first metal wire 8 and a second metal wire 8 whose shape is different from the shape of the curvature of the first metal wire 8. When the bundle 10 is placed on a rigid body, the reinforcing body takes on a flattened cross-sectional shape due to its own weight. The ratio of width to height in this cross-sectional shape is preferably 1.1 or more.

Description

Technical Field

[0001] This specification discloses a reinforcing body suitable for a three-dimensional laminating forming method for cement molded articles.

Background Art

[0002] As a building made of reinforced concrete, the formwork method is known. In this formwork method, first, reinforcing bars are inserted into the formwork. Fresh concrete is poured into this formwork. This fresh concrete solidifies, and a building is obtained. The reinforcing bars integrate with the concrete. The reinforcing bars reinforce the building.

[0003] Buildings can also be obtained by a three-dimensional laminating forming method. In the three-dimensional laminating forming method, a cement composition is extruded from a moving nozzle. From the viewpoint of avoiding interference with the nozzle, reinforcing bars cannot be used in this forming method. In this building, reinforcement by reinforcing bars cannot be done.

[0004] Japanese Unexamined Patent Application Publication No. 2022-046028 discloses a reinforcing body suitable for a molded article obtained by a three-dimensional laminating forming method. This reinforcing body is supplied from a nozzle that extrudes a cement composition. This reinforcing body is flexible.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The reinforcing performance of the reinforcing body disclosed in Japanese Unexamined Patent Application Publication No. 2022-046028 is insufficient. What the applicant intends is to provide a reinforcing body that is flexible and can contribute to the high strength of a cement molded article.

Means for Solving the Problems

[0007] The reinforcement for a cement structure disclosed herein has a bundle containing a plurality of metal wires. At least one of the metal wires has a curved or bent shape. [Effects of the Invention]

[0008] This reinforcement increases the strength of cement structures. Because this reinforcement is flexible, it can be applied to curved cement structures. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view showing a cement-molded object according to one embodiment. [Figure 2] Figure 2 is a plan view showing the cement structure shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view along the line III-III in Figure 2. [Figure 4] Figure 4 is a plan view showing a portion of the reinforcing body of the cement structure shown in Figure 2. [Figure 5] Figure 5 is a cross-sectional view along the VV line in Figure 4. [Figure 6] Figure 6(a) is a plan view showing the metal wires of the reinforcing body in Figure 4, and Figure 6(b) is a view of the metal wires of Figure 6(a) from the right. [Figure 7] Figure 7 is an enlarged cross-sectional view along the line VII-VII in Figure 6. [Figure 8] Figure 8 is a front view showing an example of a manufacturing method for the cement molded object shown in Figure 1. [Figure 9] Figure 9 is a plan view showing the hardened cement obtained by the manufacturing method shown in Figure 8. [Figure 10] Figure 10 is a plan view showing a part of the reinforcing body of a cement structure according to another embodiment. [Figure 11] Figure 11 is a plan view showing a part of a reinforcement body of a cement structure according to yet another embodiment. [Figure 12]Figure 12 is a plan view showing a part of the reinforcing body of a cement structure according to yet another embodiment. [Figure 13] Figure 13 is a cross-sectional view along the line XIII-XIII in Figure 12. [Modes for carrying out the invention]

[0010] Preferred embodiments will be described in detail below, with reference to drawings as appropriate.

[0011] Figure 1-3 shows the cement molded object 2. In each drawing, arrow X represents the width direction of the molded object 2, arrow Y represents the length direction of the molded object 2, and arrow Z represents the height direction of the molded object 2.

[0012] This cement structure 2 has multiple cement-hardened layers 4. Figures 1 and 3 show the first cement-hardened layer 4a, the second cement-hardened layer 4b, the third cement-hardened layer 4c, and the fourth cement-hardened layer 4d. The second cement-hardened layer 4b is laminated on the first cement-hardened layer 4a. The third cement-hardened layer 4c is laminated on the second cement-hardened layer 4b. The fourth cement-hardened layer 4d is laminated on the third cement-hardened layer 4c.

[0013] Each cement-hardened layer 4 can be obtained by the hardening of the cement composition. The specific material of the cement-hardened layer 4 is concrete or mortar. The composition for the cement-hardened layer 4, which is made of concrete, is ready-mix concrete. This ready-mix concrete is a composition containing cement, aggregate, and water. The composition for the cement-hardened layer 4, which is made of mortar, is ready-mix mortar. This ready-mix mortar is a composition containing cement, fine aggregate, and water.

[0014] This cement molded object 2 further has a plurality of reinforcing bodies 6. In FIG. 3, a first reinforcing body 6a, a second reinforcing body 6b, and a third reinforcing body 6c are shown. The first reinforcing body 6a is located at the boundary between the first cement hardened layer 4a and the second cement hardened layer 4b. In the present embodiment, the first reinforcing body 6a exists straddling the first cement hardened layer 4a and the second cement hardened layer 4b. The first reinforcing body 6a may be buried in either the first cement hardened layer 4a or the second cement hardened layer 4b. The second reinforcing body 6b is located at the boundary between the second cement hardened layer 4b and the third cement hardened layer 4c. In the present embodiment, the second reinforcing body 6b exists straddling the second cement hardened layer 4b and the third cement hardened layer 4c. The second reinforcing body 6b may be buried in either the second cement hardened layer 4b or the third cement hardened layer 4c. The third reinforcing body 6c is located at the boundary between the third cement hardened layer 4c and the fourth cement hardened layer 4d. In the present embodiment, the third reinforcing body 6c exists straddling the third cement hardened layer 4c and the fourth cement hardened layer 4d. The third reinforcing body 6c may be buried in either the third cement hardened layer 4c or the fourth cement hardened layer 4d.

[0015] In FIGS. 4 and 5, the reinforcing body 6 is shown. This reinforcing body 6 has a bundle 10 including a plurality of metal wires 8. This bundle 10 is not wrapped. In FIG. 5, the reinforcing body 6 is placed on a pedestal 12. This pedestal 12 is a rigid body. The force applied to the reinforcing body 6 is only the gravity of the earth. The reinforcing body 6 exhibits a flat cross-sectional shape due to its own weight. Specifically, the reinforcing body 6 exhibits a cross-sectional shape in which the length in the horizontal direction (the left-right direction in FIG. 5) is larger than the length in the vertical direction (the up-down direction in FIG. 5). As shown in FIG. 5, a space may exist between the metal wire 8 and other metal wires 8. In this reinforcing body 6, the metal wires 8 are arranged coarsely. This reinforcing body 6 is flexible.

[0016] As shown in FIG. 5, in the reinforcing member 6, a plurality of metal wires 8 are stacked in the vertical direction. Therefore, at least one metal wire 8 is located above the other metal wires 8. This reinforcing member 6 has sufficient rigidity in the thickness direction (the vertical direction in FIG. 5).

[0017] FIGS. 6 and 7 show the metal wire 8. Preferred materials for this metal wire 8 include alloy steel and carbon steel. A preferred alloy steel is stainless steel. The metal wire 8 may have a coating such as a plating layer on its surface. The metal wire 8 may be a single wire or an aggregate of a plurality of wires. The aggregate may be a stranded wire. In the present embodiment, the cross-section of the metal wire 8 is circular. In FIGS. 6 and 7, arrow D represents the diameter of this metal wire 8. The cross-section of the metal wire 8 may be non-circular. Examples of non-circular shapes include polygons such as quadrilaterals, ellipses, and track shapes.

[0018] As shown in FIG. 6, the metal wire 8 has a twist. A metal wire 8 with a twist can be produced by known twisting methods. In the present embodiment, the metal wire 8 has a wave-shaped twist. In this wave shape, a plurality of units each of which is a curve are continuous. The metal wire 8 may have a wave shape in which there are corners between a unit and another unit. The metal wire 8 may have a wave shape in which a plurality of units each of which is a straight line are continuous. The metal wire 8 may have a wave shape including both a unit that is a curve and a unit that is a straight line.

[0019] In the present embodiment, the amplitude of the wave is constant. Therefore, the maximum wave height of this wave is twice the amplitude. In FIGS. 6 and 7, arrow H represents the maximum wave height of this metal wire 8. In FIG. 6, arrow Pw represents the wavelength of this metal wire 8. The metal wire 8 may have a twist with a non-constant amplitude. The metal wire 8 may have a twist with a non-constant wavelength. The metal wire 8 may have a three-dimensional twist such as a helix. The reinforcing member 6 may include both a metal wire 8 with a twist and a metal wire 8 without a twist.

[0020] In the reinforcing body 6, the metal wires 8 make point contact, line contact, or surface contact with each other. Metal wires 8 that have a tendency to curl are more likely to make point contact with other metal wires 8. In this reinforcing body 6, the contact area between metal wires 8 and other metal wires 8 is small. The reinforcing body 6, which includes metal wires 8 that have a tendency to curl, is flexible.

[0021] Figure 8 shows a method for manufacturing the cement-molded object 2. This figure shows a first cement composition 14a, a first reinforcing body 6a, a second cement composition 14b, a second reinforcing body 6b, and a nozzle 16. The nozzle 16 is part of the 3D printer. In Figure 8, the second cement composition 14b is extruded from this nozzle 16. The second reinforcing body 6b is also extruded from this nozzle 16. The second reinforcing body 6b is extruded with a portion of it embedded in the second cement composition 14b. The second reinforcing body 6b may be extruded with the entire body embedded in the second cement composition 14b. The second reinforcing body 6b may be extruded from a nozzle different from the nozzle 16 for the second cement composition 14b.

[0022] As the nozzle 16 moves in the direction of arrow A1, the second cement composition 14b is extruded, and this second cement composition 14b is laminated onto the first cement composition 14a. The second cement composition 14b covers the first reinforcing body 6a. Similarly, the cement compositions 14 are then sequentially laminated.

[0023] When the first cement composition 14a hardens, a first cement hardened layer 4a (see Figure 1) is obtained. When the second cement composition 14b hardens, a second cement hardened layer 4b is obtained. The second cement hardened layer 4b is integral with the first cement hardened layer 4a. Therefore, the boundary between the first cement hardened layer 4a and the second cement hardened layer 4b cannot be clearly seen. Since the cement composition 14 is fluid, the height BH (see Figure 3) of the boundary between the first cement hardened layer 4a and the second cement hardened layer 4b is not constant. The first reinforcing body 6a is located near the boundary between the first cement hardened layer 4a and the second cement hardened layer 4b. The first reinforcing body 6a is embedded in both or either the first cement hardened layer 4a and the second cement hardened layer 4b.

[0024] This manufacturing method is also known as 3D printing. This manufacturing method can produce a cement-molded object 2 that is reinforced not by reinforcing bars, but by reinforcing members 6. Because the reinforcing members 6 are flexible, they can take on a flattened shape even within the cement-molded object 2. In the embodiments shown in Figures 2 and 3, the reinforcing members 6 have a long cross-sectional shape along the width direction X of the cement-molded object 2. The width Wr of the reinforcing members 6 in the cement-molded object 2 is large. A reinforcing member 6 with a large width Wr can reinforce a wide area in the width direction X of the cement-molded object 2. From the viewpoint of reinforcement, the ratio of the width Wr of the reinforcing members 6 to the width Wc of the cement-hardened layer 4 is preferably 20% or more, more preferably 30% or more, and particularly preferably 35% or more.

[0025] When the nozzle 16 moves in a straight line, a straight cement hardened layer 4 is formed. When the nozzle 16 moves in a curved direction, a curved cement hardened layer 4 is formed. Figure 9 shows the curved cement hardened layer 4. As mentioned above, this reinforcing body 6 is flexible. As shown in Figure 9, this reinforcing body 6 follows the curvature of the cement hardened layer 4. This reinforcing body 6 is also suitable for curved cement molded objects 2.

[0026] 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 molded object 2. Since the cement molded object 2 has reinforcing bodies 6, only a small amount of short fibers is needed. A cement composition 14 containing a small amount of short fibers, or none at all, is less likely to cause clogging of the nozzle 16. The cement molded object 2 may also contain reinforcing bars along with the reinforcing bodies 6.

[0027] In Figure 5, arrow Wr represents the width of the reinforcing body 6, and arrow Hr represents the height of the reinforcing body 6. The width Wr and height Hr are measured with only Earth's gravity acting on the reinforcing body 6. A reinforcing body 6 with a large ratio of width Wr to height Hr (Wr / Hr) has a small restraining force between the metal wires 8. A reinforcing body 6 with a large ratio (Wr / Hr) has excellent flexibility. From the viewpoint of flexibility, a ratio (Wr / Hr) of 1.1 or higher is preferable, 1.5 or higher is more preferable, and 3.0 or higher is particularly preferable. From the viewpoint of the handling of the reinforcing body 6, a ratio (Wr / Hr) of 10.0 or lower is preferable. The width Wr and height Hr are measured at 10 randomly selected locations from a sample with a length of 500 mm or more. The measurements are taken using calipers.

[0028] In each metal wire 8, the ratio of the maximum wave height H to the diameter D (see Figures 6 and 7) is preferably 150% or more. Metal wires 8 with this ratio of 150% or more are flexible. From this viewpoint, this ratio is more preferably 180% or more, and particularly preferably 200% or more. This ratio is preferably 1000% or less.

[0029] The diameter D of each metal wire 8 is preferably 0.05 mm or more and 1 mm or less. The number N of metal wires 8 in the reinforcing body 6 is preferably 3 or more, more preferably 5 or more, and particularly preferably 10 or more. This number N is preferably 100 or less. The reinforcing body 6 may have multiple types of metal wires 8 with different diameters D. The diameter D of all metal wires 8 in the reinforcing body 6 may be the same.

[0030] In one reinforcing body 6, the pitch Pw of the metal wires 8 may be the same as the pitch Pw of the other metal wires 8. In one reinforcing body 6, the pitch Pw of the metal wires 8 may be different from the pitch Pw of the other metal wires 8.

[0031] A bundle 10 may be obtained by twisting together multiple metal wires 8.

[0032] Figure 10 shows a reinforcing body 18 of a cement molded object according to another embodiment. This reinforcing body 18 has a bundle 21 containing a first metal wire 20a and a second metal wire 20b. This bundle 21 has a large number of metal wires 20, but the illustration of the metal wires 20 other than the first metal wire 20a and the second metal wire 20b is omitted. The material of the first metal wire 20a and the second metal wire 20b is the same as the material of the metal wire 8 shown in Figure 6.

[0033] The first metal wire 20a has a curve. In this embodiment, the first metal wire 20a has a corrugated curve. In Figure 10, arrow Ha represents the maximum wave height of the curve of the first metal wire 20a, and arrow Pa represents the pitch of the curve of the first metal wire 20a. The second metal wire 20b has a curve. In this embodiment, the second metal wire 20b has a corrugated curve. In Figure 10, arrow Hb represents the maximum wave height of the curve of the second metal wire 20b, and arrow Pb represents the pitch of the curve of the second metal wire 20b. In this embodiment, the maximum wave height Hb of the second metal wire 20b is the same as the maximum wave height Ha of the first metal wire 20a, and the pitch Pb of the second metal wire 20b is the same as the pitch Pa of the first metal wire 20a.

[0034] In Figure 10, the symbol PKa represents the peak of the coil curvature of the first metal wire 20a, and the symbol PKb represents the peak of the coil curvature of the second metal wire 20b. In the vertical direction of Figure 10, the position of peak PKb is different from the position of peak PKa. In other words, the phase of the coil curvature of the second metal wire 20b is different from the phase of the coil curvature of the first metal wire 20a. Therefore, the contact area of ​​the second metal wire 20b with the first metal wire 20a is small. This difference in phase may contribute to the flexibility of the reinforcing body 18.

[0035] In Figure 10, arrow L represents the phase shift distance. The ratio Pt, calculated using the following formula, is an index (%) representing the magnitude of the phase shift. Pt = (L / (Pa / 2)) * 100 From the viewpoint of the flexibility of the reinforcing body 18, the ratio Pt is preferably 5% or more, more preferably 8% or more, and particularly preferably 10% or more. This index Pt may also be 100%.

[0036] Figure 11 shows a reinforcing body 22 for a cement structure according to yet another embodiment. This reinforcing body 22 has a bundle 25 containing a first metal wire 24a and a second metal wire 24b. This bundle 25 has a large number of metal wires 24, but the illustration of the metal wires 24 other than the first metal wire 24a and the second metal wire 24b is omitted. The material of the first metal wire 24a and the second metal wire 24b is the same as the material of the metal wire 8 shown in Figure 6.

[0037] The first metal wire 24a has a curvature. In this embodiment, the first metal wire 24a has a corrugated curvature. In Figure 11, arrow Ha represents the maximum wave height of the curvature of the first metal wire 24a. The second metal wire 24b has a curvature. In this embodiment, the second metal wire 24b has a corrugated curvature. In Figure 11, arrow Hb represents the maximum wave height of the curvature of the second metal wire 24b. In this embodiment, the maximum wave height Hb of the second metal wire 24b is smaller than the maximum wave height Ha of the first metal wire 24a. In other words, the shape of the curvature of the second metal wire 24b is different from the shape of the curvature of the first metal wire 24a. Therefore, the contact area of ​​the second metal wire 24b with the first metal wire 24a is small. The difference in the shape of the metal wires can contribute to the flexibility of the reinforcing body 22. The pitch of the curl of the second metal wire 24b may differ from the pitch of the curl of the first metal wire 24a. The maximum wave height and pitch of the curl of the second metal wire 24b may differ from the maximum wave height and pitch of the curl of the first metal wire 24a, respectively.

[0038] From the viewpoint of the flexibility of the reinforcing body 22, the ratio of the maximum wave height Ha to the maximum wave height Hb (Ha / Hb) is preferably 1.10 or higher, more preferably 1.20 or higher, and particularly preferably 1.25 or higher. From the viewpoint of the handlingability of the reinforcing body 22, this ratio (Ha / Hb) is preferably 10.0 or lower.

[0039] Figures 12 and 13 show a reinforcement 26 for a cement structure according to yet another embodiment. This reinforcement 26 has a bundle 28 and a wrapping wire 30. The bundle 28 contains a plurality of metal wires 32. The wrapping wire 30 has a spiral shape. The wrapping wire 30 bundles these metal wires 32 together. The wrapping wire 30 loosely bundles these metal wires 32. Therefore, the restraining force of the wrapping wire 30 on each metal wire 32 is weak. The specifications of the bundle 28 are the same as those of the bundle 10 shown in Figures 4 and 5. The specifications of each metal wire 32 are the same as those of the metal wire 8 shown in Figures 6 and 7. These metal wires 32 have a curvature.

[0040] In Figure 13, the reinforcing body 26 is placed on a base 34. This base 34 is a rigid body. The only force acting on the reinforcing body 26 is the Earth's gravity. Because the restraining force of the wrapping wires 30 on each metal wire 32 is weak, the reinforcing body 26 exhibits a flattened cross-sectional shape due to its own weight. Specifically, the reinforcing body 26 has a cross-sectional shape in which the length in the horizontal direction (left-right direction in Figure 13) is greater than the length in the vertical direction (up-down direction in Figure 13). As shown in Figure 13, there may be space between metal wires 32 and other metal wires 32. In this reinforcing body 26, the metal wires 32 are roughly arranged. This reinforcing body 26 is flexible.

[0041] The wrapping wire 30 is formed from synthetic fibers or natural fibers. Examples of synthetic fibers include nylon fibers and polyester fibers. Examples of natural fibers include cotton fibers, linen fibers, and silk fibers. The wrapping wire 30 may also be a single wire of synthetic resin. The material of the wrapping wire 30 may be metal, rubber, or paper. The cross-sectional shape of the wrapping wire 30 is circular. This cross-sectional shape may also be elliptical, quadrilateral, etc. The wrapping wire 30 may also be in the shape of a strip. A strip-shaped wrapping wire 30 can cover the entire circumference of the bundle 28.

[0042] When the material of the metal wire 32 is metal, it is preferable that the material of the wrapping wire 30 is nonmetallic. The restraining force of the wrapping wire 30, which is made of a nonmetallic material, on the metal wire 32 is weak. This reinforcing body 26 tends to take on a flattened cross-sectional shape due to its own weight. It is preferable that the tensile strength of the wrapping wire 30 is less than the tensile strength of the metal wire 32.

[0043] In Figure 12, arrow P1 represents the pitch of the curvature of the metal wire 32, and arrow P2 represents the pitch of the wrapping wire 30. The pitch P2 of the wrapping wire 30 may be the same as the pitch P1 of the metal wire 32. The pitch P2 of the wrapping wire 30 may be different from the pitch P1 of the metal wire 32. The reinforcing body 26 may have two wrapping wires 30 with different winding directions. The reinforcing body 26 may have two wrapping wires 30 with the same winding direction. The reinforcing body 26 may have three or more wrapping wires 30.

[0044] [Disclosure items] Each of the following items discloses a preferred embodiment.

[0045] [Item 1] It has a bundle containing multiple metal strands, A reinforcing body for cement structures, in which at least one metal wire has a curvature.

[0046] [Item 2] The reinforcing body according to item 1, wherein when the bundle is placed on a rigid body, at least one metal wire is positioned above the other metal wires.

[0047] [Item 3] The reinforcing body described in item 1 or 2, wherein the above curvature is wave-shaped or spiral-shaped.

[0048] [Item 4] The reinforcing body according to any one of items 1 to 3, wherein the bundle includes a first metal wire having a curvature and a second metal wire having a curvature whose phase is different from the phase of the curvature of the first metal wire.

[0049] [Item 5] The reinforcing body according to any one of items 1 to 4, wherein the bundle includes a first metal wire having a curvature and a second metal wire whose shape is different from the curvature of the first metal wire.

[0050] [Item 6] When the above bundle is placed on a rigid body, it takes on a flattened cross-sectional shape due to its own weight. The reinforcing body described in item 1, wherein the ratio of width to height in the above cross-sectional shape is 1.1 or greater.

[0051] [Item 7] A reinforcing body according to any one of items 1 to 6, further comprising wrapping wires for bundling the above metal strands.

[0052] [Item 8] First cement hardened layer, The second cement hardened layer is laminated on the first cement hardened layer mentioned above. and Reinforcement embedded in the first cement hardened layer or the second cement hardened layer It is equipped with, The above reinforcing body has a bundle containing multiple metal wires, A cement structure in which at least one metal wire has a curvature.

[0053] [Item 9] A: A step of extruding a reinforcing body having a bundle containing multiple metal wires, wherein at least one metal wire has a curve, and a first cement composition. B: A step of extruding the second cement composition and laminating it onto the first cement composition. and C: A process for curing the first cement composition and the second cement composition. A method for manufacturing cement sculptures, comprising the following features. [Industrial applicability]

[0054] The reinforcement described above is suitable for various cement structures such as buildings, bridges, poles, tunnels, and wharves. [Explanation of Symbols]

[0055] 2. Cement sculptures 4. Hardened cement layer 4a...First cement hardening layer 4b...Second cement hardening layer 4c...Third cement hardening layer 4d...Fourth cement hardening layer 6. Reinforcement 6a...First reinforcing body 6b...Second reinforcement 6c...Third reinforcement body 8. Metal wire 10...bundle 14. Cement composition 14a...First Cement Composition 14b...Second cement composition 16...nozzles 18. Reinforcement 20a...First metal wire 20b...Second metal wire 21...bundle 22... Reinforcement 24a...First metal wire 24b...Second metal wire 25...bundle 26. Reinforcement 28...bundle 30... Wrapping line 32... Metal wire

Claims

1. It has a bundle containing multiple metal strands, A reinforcing body for cement structures, in which at least one metal wire has a curvature.

2. The reinforcing body according to claim 1, wherein when the bundle is placed on a rigid body, at least one metal wire is positioned above the other metal wires.

3. The reinforcing body according to claim 1 or 2, wherein the above-mentioned curvature is wave-shaped or spiral-shaped.

4. The reinforcing body according to claim 1 or 2, wherein the bundle includes a first metal wire having a curvature and a second metal wire having a curvature whose phase is different from the phase of the curvature of the first metal wire.

5. The reinforcing body according to claim 1 or 2, wherein the bundle includes a first metal wire having a curvature and a second metal wire whose shape is different from the curvature of the first metal wire.

6. When the above bundle is placed on a rigid body, it takes on a flattened cross-sectional shape due to its own weight. The reinforcing body according to claim 1, wherein the ratio of width to height in the above cross-sectional shape is 1.1 or more.

7. The reinforcing body according to claim 1 or 2, further comprising wrapping wires for bundling the above-mentioned metal strands.

8. First cement hardened layer, The second cement hardened layer is laminated on the first cement hardened layer mentioned above. and Reinforcement embedded in the first cement hardened layer or the second cement hardened layer It is equipped with, The above reinforcing body has a bundle containing multiple metal wires, A cement structure in which at least one metal wire has a curvature.

9. A: A step of extruding a reinforcing body having a bundle containing multiple metal wires, wherein at least one metal wire has a curve, and a first cement composition. B: A step of extruding the second cement composition and laminating it onto the first cement composition. and C: A process for hardening the first cement composition and the second cement composition. A method for manufacturing cement sculptures, comprising the following features.

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