Reinforcing member of cement shaped article

Abstract

To provide a cement shaped article 2 having excellent strength.SOLUTION: A cement shaped article 2 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 2 further has a first reinforcing member 6a, a second reinforcing member 6b and a third reinforcing member 6c. The first reinforcing member 6a is positioned at a boundary between the first cement hardened layer 4a and the second cement hardened layer 4b. The second reinforcing member 6b is positioned at a boundary between the second cement hardened layer 4b and the third cement hardened layer 4c. The third reinforcing member 6c is positioned at a boundary between the third cement hardened layer 4c and the fourth cement hardened layer 4d. Each reinforcing member 6 has a coil. The coil has a plurality of loops 12. Each loop 12 is separate from other loops 12 adjacent thereto.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present specification discloses a reinforcing member suitable for three-dimensional 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 present disclosure provides a reinforcing member for a cementitious object, comprising a coil having a plurality of continuous loops, each of which has an axial direction Ax that is inclined relative to the length of the coil, and each of which is spaced apart from adjacent loops.

[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 member embedded in the first hardened cement layer or the second hardened cement layer The reinforcing member includes a coil having a plurality of continuous loops, each of which has an axial direction Ax inclined relative to the longitudinal direction of the coil, and each of which is spaced apart from its adjacent loop.

[0009] The present specification discloses a method for producing a cement shaped object, A: A step of extruding a reinforcing member having a coil with a plurality of continuous loops, wherein an axial direction Ax of each loop is inclined with respect to a longitudinal direction of the coil, and the loops are spaced apart from each other adjacent loops, 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 member increases the strength of the cementitious object in various directions. [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 member of the cement shaped object of FIG. 3, and FIG. 5(b) is a front view thereof. [Figure 6] 6(a) is a plan view showing the elements of the reinforcing member 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 a cement model according to another embodiment. [Figure 9] 9(a) is a plan view showing the reinforcing member of the cement shaped object of FIG. 8, and FIG. 9(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 cement shaped object 2 further includes a plurality of reinforcing members 6. FIGS. 3 and 4 show a first reinforcing member 6a, a second reinforcing member 6b, and a third reinforcing member 6c. FIGS. 3 and 4 show the entire reinforcing members 6, not cross sections. The first reinforcing member 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 member 6a straddles the first hardened cement layer 4a and the second hardened cement layer 4b. The first reinforcing member 6a may be embedded in either the first hardened cement layer 4a or the second hardened cement layer 4b. The second reinforcing member 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 member 6b straddles the second hardened cement layer 4b and the third hardened cement layer 4c. The second reinforcing member 6b may be embedded in either the second hardened cement layer 4b or the third hardened cement layer 4c. The third reinforcing member 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 member 6c exists across the third hardened cement layer 4c and the fourth hardened cement layer 4d. The third reinforcing member 6c may be embedded in either the third hardened cement layer 4c or the fourth hardened cement layer 4d. In this embodiment, the specifications of the second reinforcing member 6b are the same as those of the first reinforcing member 6a, and the specifications of the third reinforcing member 6c are also the same as those of the first reinforcing member 6a.

[0017] FIG. 5 shows a reinforcing member 6. This reinforcing member 6 has a coil 8. In other words, this reinforcing member 6 has a three-dimensional shape. The coil 8 can 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 oval, rectangular, and triangular. A preferred material for the coil 8 is metal. Preferred metals include alloy steel such as stainless steel, carbon steel, and other iron-based alloys. The raw wire may have a coating such as a plating layer on its surface. The material for the coil 8 may be synthetic resin, glass, or the like. The raw wire may be a single wire or an assembly of multiple strands. The assembly may be wrapped with a wrapping wire. The assembly may be a twisted wire. In the assembly, each strand may be wavy or spiral.

[0018] The coil 8 has a plurality of elements 10. These elements 10 are aligned in the left-right direction in FIG. 5. Each element 10 is continuous with its adjacent element 10. The metal of the coil 8 has high tensile strength. Because the coil 8 has a three-dimensional shape, the reinforcing member 6 increases the strength of the cement model 2 in various directions. The cement model 2 has excellent strength.

[0019] FIG. 6 shows an element 10. The element 10 has a loop 12 and a joint 14. In this embodiment, the loop 12 is generally circular. The loop 12 may have an elliptical, oval, or other shape. The joint 14 is continuous with the loop 12. The radius of curvature of the joint 14 is larger than the radius of curvature of the loop 12. In this embodiment, the joint 14 has a straight shape. Therefore, the radius of curvature of the joint 14 is infinite. The shape of the joint 14 may be a curve. The shape of the joint 14 may be a combination of multiple curves with different radii of curvature. The shape of the joint 14 may be a combination of a straight line and a curve.

[0020] As is clear from Fig. 5, a plurality of loops 12 and a plurality of joints 14 are alternately arranged along the length direction of the coil 8 (the left-right direction in Fig. 5). As is clear from Fig. 3, the cement composition is also present between a loop 12 and another adjacent loop 12. As is clear from Fig. 4, the cement composition is also present within the outline of the element 10 of the reinforcing member 6. The coil 8 comes into contact with the cement composition over a wide area.

[0021] The joints 14 connect the loops 12 to each other. Due to the presence of the joints 14, the axial direction Ax (see FIG. 5(b)) of the elements 10 is significantly inclined with respect to the longitudinal direction of the coil 8. The angle of the axial direction Ax of the elements 10 with respect to the longitudinal direction of the coil 8 is preferably 45° or more, more preferably 60° or more, and particularly preferably 70° or more. This angle is preferably 85° or less. Because the axial direction Ax is inclined, the width Wr of the coil 8 is greater than the height Hr. The pitch Pe of the elements 10 is approximately equal to the length Lj of the joints 14 (see FIG. 6). In a plan view, the elements 10 overlap with each other. A method for manufacturing a wire having such a coil 8 shape is disclosed in Japanese Patent Application Laid-Open No. 2004-244788.

[0022] 2, the coil 8 having a large width Wr can reinforce a wide area in the width direction X of the cement model 2. From the viewpoint of reinforcement, the ratio of the width Wr of the coil 8 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 16a, a first reinforcing member 6a, a second cement composition 16b, a second reinforcing member 6b, and a nozzle 18. The nozzle 18 is part of a 3D printer. In FIG. 7, the second cement composition 16b is extruded from the nozzle 18. The second reinforcing member 6b is also extruded from the nozzle 18. The second reinforcing member 6b is extruded in a state where a portion of the second reinforcing member 6b is embedded in the second cement composition 16b. The second reinforcing member 6b may be extruded in a state where the entirety of the second reinforcing member 6b is embedded in the second cement composition 16b. The second reinforcing member 6b may be extruded from a nozzle different from the nozzle 18 for the second cement composition 16b.

[0024] As the nozzle 18 moves in the direction of arrow A1, the second cement composition 16b is extruded, and the second cement composition 16b is layered on the first cement composition 16a. The second cement composition 16b covers the first reinforcing member 6a. Similarly, the cement compositions 16 are layered one after another.

[0025] The first hardened cement layer 4a (see FIG. 1) is obtained by hardening the first cement composition 16a. The second hardened cement layer 4b is obtained by hardening the second cement composition 16b. 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 16 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 member 6a is located near the boundary between the first hardened cement layer 4a and the second hardened cement layer 4b. The first reinforcing member 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 not with steel bars but with reinforcing members 6.

[0027] When the nozzle 18 moves in a straight line, a straight hardened cement layer 4 is formed. When the nozzle 18 moves in a curved line, a curved hardened cement layer 4 is formed. The reinforcing member 6 has a coil 8 and is therefore flexible. This reinforcing member 6 can follow the curvature of the hardened cement layer 4. This reinforcing member 6 is also suitable for a curved cement model 2.

[0028] The cement composition 16 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. Since the cement shaped object 2 has the reinforcing members 6, a small amount of short fibers is sufficient. A cement composition 16 containing a small amount of short fibers or no short fibers at all is less likely to clog the nozzle 18.

[0029] A coil 8 having a small height Hr (see FIG. 5) is easily extruded from the nozzle 18. In this respect, the ratio of the height Hr to the width Wr is preferably equal to or less than 60%, more preferably equal to or less than 40%, and particularly preferably equal to or less than 30%.

[0030] In Figure 6(a), the arrow Dr represents the wire diameter of the coil 8. 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.

[0031] In Fig. 6(b), arrow Gp indicates the gap distance between a loop 12 and an adjacent loop 12. From the viewpoint that a sufficient amount of cement composition 16 can be present between a loop 12 and an adjacent loop 12, the ratio of the gap distance Gp to the wire diameter Dr is preferably 50% or more, more preferably 100% or more, and particularly preferably 150% or more. This ratio is preferably 500% or less.

[0032] 8 shows a cement object 20 according to another embodiment. The object 20 has a hardened cement layer 22 and a reinforcing member 24. Although not shown, the cement object 20 has a plurality of hardened cement layers 22 and a plurality of reinforcing members 24, similar to the object 2 shown in FIGS. 1-4. Each reinforcing member 24 is located near the boundary between one hardened cement layer 22 and another hardened cement layer 22 adjacent thereto.

[0033] FIG. 9 shows a reinforcing member 24. This reinforcing member 24 has a coil 26 and a wire 28. The specifications of the coil 26 are the same as those of the coil 8 shown in FIG. 5. The coil 26 has a plurality of elements 30. The elements 30 have loops 32 and joints 34. In this embodiment, the wire 28 is not coiled. The cross section of the wire 28 may be circular or non-circular. Examples of non-circular shapes include an ellipse, a rectangle, and a triangle.

[0034] The wire 28 passes through the multiple coils 26. In FIG. 9 , the left end 36 of each coil 26 is positioned below the wire 28. The right end 38 of the coil 26 is positioned above the wire 28. When a force is applied to the coil 26 and the coil 26 is deformed, the loops 32 abut against the wire 28. This abutment prevents further deformation of the coil. In other words, the wire 28 can maintain a gap between each loop 32 and its adjacent loop 32. In this reinforcing member 24, the cement composition can be sufficiently filled between each loop 32 and its adjacent loop 32.

[0035] In Figure 9(a), arrow Dw indicates the wire diameter of wire 28. From the viewpoint of ensuring that a sufficient amount of cement composition exists between loops 32 adjacent to each other, the ratio of wire diameter Dw of wire 28 to wire diameter Dr of coil 26 is preferably 50% or more, more preferably 70% or more, and particularly preferably 90% or more. This ratio is preferably 300% or less.

[0036] The reinforcing member 24 may have two or more wires 28. Each wire 28 passes through multiple coils 26.

[0037] [Disclosure items] Each of the following sections discloses a preferred embodiment.

[0038] [Item 1] a coil having a plurality of continuous loops; The axial direction Ax of each loop is inclined with respect to the longitudinal direction of the coil, A reinforcing member for a cementitious object, wherein the loop is spaced apart from other loops adjacent thereto.

[0039] [Item 2] further comprising a wire; Item 2. The reinforcing member according to item 1, wherein the wire passes through the loop.

[0040] [Item 3] 3. The reinforcing member according to item 1 or 2, wherein a gap distance Gp between the loop and another adjacent loop is 50% or more of the wire diameter Dr of the coil.

[0041] [Item 4] 4. The reinforcing member according to any one of items 1 to 3, wherein the loops overlap with other loops in a plan view.

[0042] [Item 5] 5. The reinforcing member according to any one of items 1 to 4, wherein the width Wr of the coil is greater than the height Hr of the coil.

[0043] [Item 6] Item 6. The reinforcing member according to item 5, wherein the ratio of the height Hr to the width Wr is 60% or less.

[0044] [Item 7] First cement hardened layer, a second hardened cement layer laminated on the first hardened cement layer; and A reinforcing member embedded in the first hardened cement layer or the second hardened cement layer It is equipped with the reinforcing member has a coil having a plurality of continuous loops; The axial direction Ax of each loop is inclined with respect to the longitudinal direction of the coil, The cement structure, wherein the loop is spaced apart from other adjacent loops.

[0045] [Item 8] 8. The cement shaped object according to item 7, wherein a ratio of a width Wr of the reinforcing member to a width Wc of the first hardened cement layer is 40% or more.

[0046] [Item 9] A: A step of extruding a reinforcing member having a coil with a plurality of continuous loops, wherein an axial direction Ax of each loop is inclined with respect to a longitudinal direction of the coil, and the loops are spaced apart from each other adjacent loops, 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]

[0047] The reinforcing member described above is suitable for various cement structures such as buildings, bridges, poles, tunnels, and quays. [Explanation of symbols]

[0048] 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. Reinforcement member 6a... First reinforcing member 6b Second reinforcing member 6c Third reinforcing member 8. Coil 10 Elements 12 Loops 14···Joint 16. Cement composition 16a... First cement composition 16b... Second cement composition 18 Nozzle 20. Cement sculpture 22 Hardened cement layer 24 Reinforcing member 26 coil 28 wires 30 Elements 32 Loop 34... Joint 36...Left end 38 Right end

Claims

1. a coil having a plurality of continuous loops; An axial direction Ax of each loop is inclined with respect to the longitudinal direction of the coil, A reinforcing member for a cementitious object, wherein the loop is spaced apart from other loops adjacent thereto.

2. a wire; The reinforcing member of claim 1 , wherein the wire passes through the loop.

3. 3. The reinforcing member according to claim 1, wherein a gap distance Gp between the loop and another adjacent loop is 50% or more of a wire diameter Dr of the coil.

4. The reinforcing member according to claim 1 or 2, wherein the loops overlap with other loops in a plan view.

5. 3. The reinforcing member according to claim 1, wherein the width Wr of the coil is greater than the height Hr of the coil.

6. The reinforcing member according to claim 5 , wherein a ratio of the height Hr to the width Wr is 60% or less.

7. First cement hardened layer, a second hardened cement layer laminated on the first hardened cement layer; and A reinforcing member embedded in the first hardened cement layer or the second hardened cement layer It is equipped with the reinforcing member has a coil having a plurality of continuous loops; An axial direction Ax of each loop is inclined with respect to the longitudinal direction of the coil, The cement structure, wherein the loop is spaced apart from other adjacent loops.

8. 8. The cement shaped object according to claim 7, wherein a ratio of a width Wr of the reinforcing member to a width Wc of the first hardened cement layer is 40% or more.

9. A: A step of extruding a reinforcing member having a coil with a plurality of continuous loops, wherein an axial direction Ax of each loop is inclined with respect to a longitudinal direction of the coil, and the loops are spaced apart from each other adjacent loops, 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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