Reinforcing body of cement-shaped article

Abstract

To provide a reinforcing body 6 which is flexible and can contribute to high strength of a cement-shaped article.SOLUTION: The reinforcing body 6 for a cement-shaped article has a plurality of wires 8 and a wrapping wire 10 for bundling the wires 8. The binding force of the wrapping wire 10 to each wire 8 is weak. Therefore, when the reinforcing body 6 is placed on a rigid base 12, the reinforcing body 6 exhibits a flat cross-sectional shape by its own weight, and the ratio of the length L1 of the longest line segment that can be drawn in the flat cross-sectional shape to the total TD of the diameters of the wires 8 is 50% or more. Preferably, each wire 8 has a quirk. A typical wire 8 has a quirk that is wave-shaped or spiral-shaped.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present specification discloses a reinforcement body 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 body suitable for a molded object obtained by a three-dimensional additive manufacturing method. The reinforcing body is supplied from a nozzle that extrudes a cement composition. The reinforcing body is flexible. [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 body disclosed in JP 2022-046028 A is insufficient. The present applicant intends to provide a reinforcing body that is flexible and can contribute to the high strength of a cement-based object. [Means for solving the problem]

[0007] The present specification discloses a reinforcement for a cement shaped object that includes a plurality of wires and a wrapping wire that ties the wires together. When placed on a rigid body, the reinforcement assumes a flat cross-sectional shape due to its own weight. The ratio of the length L1 of the longest line segment that can be drawn within the cross-sectional shape to the total value TD of the wire diameters is 50% or more. [Effects of the Invention]

[0008] The reinforcement increases the strength of the cement structure, and since the reinforcement is flexible, it can be applied to curved cement structures. [Brief explanation of the drawings]

[0009] [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 plan view showing a part of the reinforcement body of the cement shaped object of FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6(a) is a plan view showing the wire of the reinforcing body of FIG. 4, and FIG. 6(b) is a view of the wire of FIG. 6(a) seen from the right. [Figure 7] FIG. 7 is an enlarged cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a front view showing the wrapping lines of the reinforcement of FIG. [Figure 9] FIG. 9 is a front view showing an example of a method for manufacturing the cement model of FIG. [Figure 10] FIG. 10 is a plan view showing the hardened cement product obtained by the manufacturing method of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, preferred embodiments will be described in detail with reference to the drawings as appropriate.

[0011] 1 to 3 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.

[0012] This cement shaped object 2 has a plurality of hardened cement layers 4. FIGS. 1 and 3 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.

[0013] 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.

[0014] The cement shaped object 2 further includes a plurality of reinforcing bodies 6. FIG. 3 shows a first reinforcing body 6a, a second reinforcing body 6b, and a third reinforcing body 6c. The first reinforcing body 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 body 6a straddles the first hardened cement layer 4a and the second hardened cement layer 4b. The first reinforcing body 6a may be embedded in either the first hardened cement layer 4a or the second hardened cement layer 4b. The second reinforcing body 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 body 6b straddles the second hardened cement layer 4b and the third hardened cement layer 4c. The second reinforcing body 6b may be embedded in either the second hardened cement layer 4b or the third hardened cement layer 4c. The third reinforcing body 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 body 6c is present across the third hardened cement layer 4c and the fourth hardened cement layer 4d. The third reinforcing body 6c may be embedded in either the third hardened cement layer 4c or the fourth hardened cement layer 4d.

[0015] 4 and 5 show a reinforcing body 6. This reinforcing body 6 has a plurality of wires 8 and a wrapping wire 10. The wrapping wire 10 has a spiral shape. This wrapping wire 10 bundles these wires 8. As will be described in detail later, the wrapping wire 10 loosely bundles these wires 8. Therefore, the binding force of the wrapping wire 10 to each wire 8 is weak.

[0016] In Figure 5, the reinforcing body 6 is placed on a base 12. This base 12 is rigid. The only force acting on the reinforcing body 6 is the Earth's gravity. Because the binding force of the wrapping wire 10 on each wire 8 is weak, the reinforcing body 6 has a flat cross-sectional shape due to its own weight. Specifically, the reinforcing body 6 has a cross-sectional shape in which the length in the horizontal direction (left-right direction in Figure 5) is greater than the length in the vertical direction (up-down direction in Figure 5). As shown in Figure 5, there may be spaces between wires 8 and other wires 8. In this reinforcing body 6, the wires 8 are sparsely arranged.

[0017] 6 and 7 show the wire 8. A preferred material for the wire 8 is metal. Preferred metals include alloy steel such as stainless steel, carbon steel, and other iron-based alloys. The wire 8 may have a coating such as a plating layer on its surface. The material for the wire 8 may be carbon, synthetic resin, glass, or the like. The wire 8 may be a single wire or an assembly of multiple wires. The assembly may be a twisted wire. In this embodiment, the cross section of the wire 8 is circular. In FIGS. 6 and 7, arrow D indicates the diameter of the wire 8. The cross section of the wire 8 may be non-circular.

[0018] As shown in FIG. 6, the wire 8 is curved. Curved wire 8 can be manufactured by a known curve-forming method. In this embodiment, the wire 8 is curved in a wave-like shape. The amplitude of the wave is constant. Therefore, the maximum wave height of the wave is twice the amplitude. In FIGS. 6 and 7, arrow H indicates the maximum wave height of the wire 8. The wire 8 may be curved in a spiral shape. The wire 8 may be curved with a non-constant amplitude. The wire 8 may be straight.

[0019] Figure 8 shows the wrapping line 10 in a state where it has been deformed by the weight of the reinforcing body 6. The wire 8 is not shown in Figure 8. In Figure 8, the symbol S1 indicates the longest line segment that can be drawn within the outline of the wrapping line 10.

[0020] The wrapping wire 10 is made of synthetic or natural fibers. Examples of synthetic fibers include nylon and polyester. Examples of natural fibers include cotton, hemp, and silk. The wrapping wire 10 may be a single wire made of synthetic resin. The wrapping wire 10 may also be made of metal, rubber, or paper.

[0021] If the wire 8 is made of metal, it is preferable that the wrapping wire 10 be made of a non-metallic material. If the wrapping wire 10 is made of a non-metallic material, the binding force of the wrapping wire 10 to the wire 8 is weak. This reinforcing member 6 is likely to assume a flat cross-sectional shape due to its own weight. It is preferable that the tensile strength of the wrapping wire 10 is smaller than that of the wire 8.

[0022] Since the binding force of the wrapping wires 10 on each wire 8 is weak, the reinforcement body 6 can have a flat shape even in the cement model 2. In the embodiment shown in Figures 2 and 3, the reinforcement body 6 has a cross-sectional shape that is long along the width direction X of the cement model 2. The width Wr of this reinforcement body 6 in the cement model 2 is large. A reinforcement body 6 with 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 reinforcement body 6 to the width Wc of the hardened cement layer 4 is preferably 20% or more, more preferably 30% or more, and particularly preferably 35% or more.

[0023] FIG. 9 shows a method for producing a cement shaped 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 a 3D printer. In FIG. 9, the second cement composition 14b is extruded from the nozzle 16. The second reinforcing body 6b is also extruded from the nozzle 16. The second reinforcing body 6b is extruded in a state where a portion of the second reinforcing body 6b is embedded in the second cement composition 14b. The second reinforcing body 6b may be extruded in a state where the entirety of the second reinforcing body 6b is embedded in the second cement composition 14b. The second reinforcing body 6b may be extruded from a nozzle 16 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 body 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. 3) of the boundary between the first hardened cement layer 4a and the second hardened cement layer 4b is not constant. The first reinforcing body 6a is located near the boundary between the first hardened cement layer 4a and the second hardened cement layer 4b. The first reinforcing body 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 bodies 6.

[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. 10 shows a curved hardened cement layer 4. As described above, in the reinforcement body 6, the binding force of the wrapping wire 10 to each wire 8 is weak. Therefore, the reinforcement body 6 is flexible. As shown in FIG. 10, the reinforcement body 6 follows the curvature of the hardened cement layer 4. The reinforcement body 6 is also suitable for a curved cement object 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 body 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 this embodiment, the reinforcing member 6 satisfies the following formula (1). (L1 / TD) 100 ≧ 50 (1) In this formula, L1 is the length of the longest line segment S1 that can be drawn within the cross-sectional shape of the reinforcing body 6 that is flattened due to its own weight, as described above. In this formula, TD represents the total value of the diameters of multiple wires 8. When the diameter of each wire 8 is D and the number of wires 8 in the reinforcing body 6 is N, the total value TD can be calculated using the following formula. TD = D N

[0030] In a reinforcing body 6 that satisfies the above formula (1), the ratio of the length L1 to the total value TD is 50% or more. In this reinforcing body 6, the wires 8 are sparsely arranged. In this reinforcing body 6, the binding force of the wrapping wire 10 on each wire 8 is weak. This reinforcing body 6 is flexible. From this viewpoint, this ratio is more preferably 80% or more, and particularly preferably 100% or more.

[0031] From the viewpoint of ease of handling, it is preferable that the reinforcing member 6 satisfies the following formula (2). (L1 / TD) 100 ≦ 300 (2)

[0032] From the viewpoint of ease of handling, it is preferable that the reinforcing member 6 satisfies the following formula (3). (L1 / TH) 100 ≦ 300 (3) In this formula, TH represents the total value of the maximum wave height of multiple wires 8. When the maximum wave height of each wire 8 is H and the number of wires 8 in the reinforcing body 6 is N, the total value TH can be calculated by the following formula. TH = H N

[0033] A reinforcing body 6 that uses a wrapping wire 10 made of a non-metallic material with low tensile strength has a small binding force on the wire 8. Therefore, even if multiple wires 8 are densely arranged, the reinforcing body 6 can have a flat shape. In other words, this reinforcing body 6 does not need to satisfy the above formula (1). For example, a reinforcing body 6 in which the wires 8 are made of carbon steel or alloy steel and the wrapping wires 10 are made of synthetic fiber or natural fiber can have a flat cross-sectional shape due to its own weight, even if it does not satisfy the above formula (1). Of course, it is preferable that this reinforcing body 6 also satisfy the above formula (1).

[0034] In each wire 8, the ratio of the maximum wave height H to the diameter D is preferably 150% or more. A wire 8 with this ratio of 150% or more is unlikely to come off the hardened cement layer 4 even when a tensile load is applied. A cement model 2 including this wire 8 has excellent strength. From this viewpoint, this ratio is more preferably 180% or more, and particularly preferably 200% or more. This ratio is preferably 1000% or less.

[0035] The diameter D of each wire 8 is preferably 0.05 mm or more and 1 mm or less. The number N of wires 8 in the reinforcing body 6 is preferably 5 or more, more preferably 10 or more, and particularly preferably 15 or more. This number is preferably 100 or less. The reinforcing body 6 may have a structure in which wires 8 are entangled with other wires 8. The reinforcing body 6 may have multiple types of wires 8 each having a different diameter D. The diameter D of all the wires 8 in the reinforcing body 6 may be the same.

[0036] 4, arrow P1 indicates the pitch of the curl of the wire 8. In one reinforcing member 6, the pitch P1 of the wire 8 may be the same as the pitch P1 of other wires 8. In one reinforcing member 6, the pitch P1 of the wire 8 may be different from the pitch P1 of other wires 8.

[0037] In one reinforcing member 6, the phase of the curl of the wire 8 may be the same as the phase of the curl of the other wires 8. In one reinforcing member 6, the phase of the curl of the wire 8 may be different from the phase of the other wires 8.

[0038] 4, arrow P2 represents the pitch of the wrapping wire 10. The pitch P2 of the wrapping wire 10 may be the same as the pitch P1 of the wire 8. The pitch P2 of the wrapping wire 10 may be different from the pitch P1 of the wire 8.

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

[0040] [Item 1] The wire harness includes a plurality of wires and a wrapping wire that bundles the wires together, When placed on a rigid body, it takes on a flat cross-sectional shape due to its own weight. A reinforcement for a cement-molded object, wherein the ratio of the length L1 of the longest line segment that can be drawn within the cross-sectional shape to the total value TD of the diameters of the wires is 50% or more.

[0041] [Item 2] Item 1, wherein each wire has a curve.

[0042] [Item 3] Item 3. The reinforcing body according to item 2, wherein the wire has a wavy or spiral shape.

[0043] [Item 4] 4. The reinforcement according to item 2 or 3, wherein the ratio of the maximum wave height H of the curl to the diameter D of the wire is 150% or more.

[0044] [Item 5] First cement hardened layer, a second hardened cement layer laminated on the first hardened cement layer; and A reinforcing body embedded in the first hardened cement layer or the second hardened cement layer It is equipped with The reinforcing body includes a plurality of wires and a wrapping wire that bundles the wires together, The reinforcing body has a non-circular cross-sectional shape, A cement shaped object, wherein the ratio of the length of the longest line segment that can be drawn within the cross-sectional shape to the total value of the diameters of the wires is 50% or more.

[0045] [Item 6] A: a step of extruding a reinforcing body having a plurality of wires and a wrapping wire bundling the wires, the reinforcing body having a non-circular cross-sectional shape due to its own weight when placed on a rigid body, the ratio of the length of the longest line segment that can be drawn within the cross-sectional shape to the total value of the diameters of the wires being 50% or more, 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:

[0046] [Item 7] The wire harness includes a plurality of wires and a wrapping wire that bundles the wires together, A reinforcement for a cement-molded object, wherein each wire is made of a metal and the wrapping wire is made of a non-metallic material.

[0047] [Item 8] Item 8. The reinforcement according to item 7, wherein the tensile strength of the wrapping wire is less than the tensile strength of the wire. [Industrial Applicability]

[0048] The reinforcement described above is suitable for various cement structures such as buildings, bridges, poles, tunnels, quays, etc. [Explanation of symbols]

[0049] 2. Cement sculptures 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 6a... First reinforcement body 6b Second reinforcement body 6c...Third reinforcement body 8 wires 10. Wrapping wire 14. Cement composition 14a... First cement composition 14b... Second cement composition 16 Nozzle

Claims

1. The wire harness includes a plurality of wires and a wrapping wire that bundles the wires together, When placed on a rigid body, it takes on a flat cross-sectional shape due to its own weight. A reinforcement for a cement shaped object, wherein the ratio of the length L1 of the longest line segment that can be drawn within the cross-sectional shape to the total value TD of the diameters of the wires is 50% or more.

2. 2. The reinforcement of claim 1, wherein each wire has a curve.

3. 3. The reinforcing member according to claim 2, wherein the wire has a wave-like or spiral shape.

4. 4. The reinforcing body according to claim 2, wherein a ratio of a maximum wave height H of the curl to a diameter D of the wire is 150% or more.

5. First cement hardened layer, a second hardened cement layer laminated on the first hardened cement layer; and A reinforcing body embedded in the first hardened cement layer or the second hardened cement layer It is equipped with The reinforcing body includes a plurality of wires and a wrapping wire that bundles the wires together, The reinforcing body has a non-circular cross-sectional shape, A cement shaped object, wherein the ratio of the length of the longest line segment that can be drawn within the cross-sectional shape to the total value of the diameters of the wires is 50% or more.

6. A: A step of extruding a reinforcing body having a plurality of wires and a wrapping wire bundling the wires, the reinforcing body having a non-circular cross-sectional shape due to its own weight when placed on a rigid body, the ratio of the length of the longest line segment that can be drawn within the cross-sectional shape to the total value of the diameters of the wires being 50% or more, 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:

7. The wire harness includes a plurality of wires and a wrapping wire that bundles the wires together, A reinforcement for a cement-molded object, wherein each wire is made of a metal and the wrapping wire is made of a non-metallic material.

8. The reinforcement of claim 7 , wherein the wrapping wire has a tensile strength less than the tensile strength of the wire.

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