JP2023169221A - Manufacturing method of fiber reinforced concrete member - Google Patents

Abstract

To provide a manufacturing method of a fiber reinforced concrete member capable of controlling an orientation of the fiber easily.SOLUTION: A concrete with fiber generation process of mixing a plurality of fiber F into concrete or mortar in uncured state and generating concrete with a fiber FC and a fiber reinforced concrete body construction process of extruding the concrete with fiber FC to a predetermined position from a nozzle 10 of an additional manufacturing device and constructing a fiber reinforced concrete body AC1 are provided.SELECTED DRAWING: Figure 6

Description

The present invention relates to a method for manufacturing fiber-reinforced concrete members.

In recent years, fiber-reinforced concrete, which strengthens concrete by increasing its toughness by mixing a predetermined amount of fibers into uncured concrete or mortar (hereinafter collectively referred to as concrete materials), has attracted attention. ing. Fiber-reinforced concrete is widely used for spraying tunnels, paving roads, concrete floors in buildings, foundation structures and legs, secondary concrete products, etc. The type of fibers to be mixed into the concrete material is appropriately selected in consideration of the intended use of the fiber-reinforced concrete, the type of concrete material to be mixed with the fibers, and the like.

For example, Patent Document 1 discloses an anti-slip structure using high-strength steel fiber reinforced concrete. This anti-slip structure is applicable to joining steel girders and reinforced concrete piers of bridges.

Japanese Patent Application Publication No. 2011-196098

The high-strength steel fiber-reinforced concrete described in Patent Document 1 is completed by general wet curing without special curing after filling and pouring into the formwork including the steel shell. be able to. However, when constructing the anti-slip structure described in Patent Document 1, if the steel shell (formwork) is filled with fluid high-strength steel fiber-reinforced concrete that has just been kneaded, the unhardened concrete There were cases in which the fibers were oriented in a direction different from the desired direction due to the flow. That is, conventional fiber-reinforced concrete has a problem in that it is difficult to control the orientation of fibers. If the direction of the fibers differs from the desired direction, or if the orientation of the fibers is biased, there is a risk that the mechanical performance of the fiber-reinforced concrete after curing and the structure using the fiber-reinforced concrete will be affected.

One way to address the above-mentioned problems is to install a rectifier with rotatable discs into the poured concrete during or immediately after the fiber-reinforced concrete is being poured (i.e., when it is in an uncured state). A method has been proposed in which the disk is inserted and the fibers are moved along a desired direction while rotating the disk. However, this method requires time, effort, and effort to move the rectifier after concrete is poured, and is complicated.

The present invention has been made in view of the above-mentioned circumstances, and provides a method for manufacturing a fiber-reinforced concrete member in which the orientation of fibers can be easily controlled.

The method for manufacturing a fiber-reinforced concrete member of the present invention includes a fiber-filled concrete production step in which a plurality of fibers are mixed into uncured concrete or mortar to produce fiber-filled concrete, and a nozzle of an additive manufacturing device in which the fiber-filled concrete is produced. A fiber-reinforced concrete body construction step of extruding the fiber-reinforced concrete body from the fiber-reinforced concrete body to a predetermined position and constructing the fiber-reinforced concrete body.

According to the method for producing fiber-reinforced concrete members of the present invention, each fiber is oriented in the printing direction by simply extruding fiber-containing concrete from a nozzle (hereinafter sometimes simply referred to as a nozzle) of an additive manufacturing device. This makes it easier for multiple fibers to line up. As a result, the orientation of fibers in the fiber-reinforced concrete member constituted by the fiber-reinforced concrete body can be easily controlled.

In the method for manufacturing a fiber-reinforced concrete member of the present invention, it is preferable that the size of the extrusion opening of the nozzle is shorter than the average length of the plurality of fibers.

According to the method for manufacturing a fiber-reinforced concrete member of the present invention, in the process in which fiber-filled concrete is collected near the extrusion port of a nozzle and extruded from the extrusion port, the longitudinal direction of the fibers is in a direction substantially perpendicular to the plane including the extrusion port. Therefore, the plurality of fibers are aligned more reliably than when the diameter of the extrusion port of the nozzle is equal to or greater than the average length of the plurality of fibers.

According to the method for manufacturing a fiber-reinforced concrete member of the present invention, the orientation of fibers can be easily controlled.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram for demonstrating the manufacturing method of the fiber reinforced concrete member based on one embodiment of this invention. 1 is a perspective view of a fiber-reinforced concrete member that can be manufactured by a method for manufacturing a fiber-reinforced concrete member according to an embodiment of the present invention. It is a perspective view of another fiber-reinforced concrete member which can be manufactured by the method for manufacturing a fiber-reinforced concrete member according to an embodiment of the present invention. It is a top view of yet another fiber-reinforced concrete member which can be manufactured by the method for manufacturing a fiber-reinforced concrete member according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of the fiber-reinforced concrete member shown in FIG. 4 taken along line DD'. FIG. 5 is a schematic diagram for explaining a method for manufacturing the fiber-reinforced concrete member shown in FIG. 4. FIG. 5 is a diagram of another fiber-reinforced concrete member that can be manufactured by the method for manufacturing a fiber-reinforced concrete member according to an embodiment of the present invention, and is a cross-sectional view corresponding to the case taken along the line DD' shown in FIG. 4. be. 5 is a diagram of still another fiber-reinforced concrete member that can be manufactured by the method for manufacturing a fiber-reinforced concrete member according to an embodiment of the present invention, and is a cross-sectional view corresponding to the case taken along the line DD' shown in FIG. 4. It is.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a method for manufacturing a fiber-reinforced concrete member to which the present invention is applied will be described with reference to the drawings.

(Method for manufacturing fiber reinforced concrete members)
The manufacturing method of the fiber-reinforced concrete member of this embodiment includes a fiber-reinforced concrete production process (hereinafter sometimes simply referred to as the production process), an installation process, and a fiber-reinforced concrete body construction process (hereinafter sometimes simply referred to as the construction process). ) and. Each step will be explained below.

[Generation process]
In the production process, a plurality of fibers are mixed into the concrete material to produce fiber-filled concrete. The concrete material used in this embodiment is concrete or mortar that has appropriate fluidity in an uncured state, and any known material can be used. It is preferable that the material has the following characteristics, and furthermore, is appropriately hardened in the lamination process and exhibits high strength in a short period of time.

The fibers mixed into the concrete material are short fibers made of metal or resin. Although there is no restriction on the diameter of the fibers used in the present invention, it is preferable that the diameter of the short fibers is, for example, 0.005 mm or more and 1.0 mm or less. It is preferable that the average length of the plurality of fibers is, for example, 3 mm or more and 30 mm or less. Note that the longer the length of the fibers is with respect to the inner diameter of the extrusion port 18 of the nozzle 10, which will be described later, the more reliably the fibers are aligned.

It is preferable that the fibers be mixed, for example, in an amount of 0.1% by volume or more and 5.0% by volume or less with respect to the concrete material. Specifically, the proportion of fibers in the concrete material is adjusted to such an extent that the fiber-filled concrete can maintain its shape in the air and to the extent that drying shrinkage cracking of the fiber-filled concrete can be suppressed. In order to exhibit the tensile toughness of the fiber-reinforced concrete body against external forces after the fiber-filled concrete hardens, it is preferable that fibers be mixed in an amount of 1.0% by volume or more based on the concrete material.

[Installation process]
In order to make at least the nozzle 10 movable in the construction process described below in accordance with the shape of the fiber-reinforced concrete member to be manufactured, an additive manufacturing apparatus having the nozzle 10 shown in FIG. (as shown) is installed at the construction site. Further, in order to make the additive manufacturing device movable and change the position of the additive manufacturing device in the X and Y directions and the height in the Z direction, rails and lifts may be further provided at the site.

[Construction process]
In the construction process, as shown in Fig. 1, the fiber-filled concrete FC generated in the generation process is supplied to an additive manufacturing device, and the fiber-filled concrete FC is extruded from the nozzle 10 of the additive manufacturing device to a predetermined position to form fiber-reinforced concrete. Install body AC. The fiber-reinforced concrete member to be manufactured in this embodiment is a member formed by joining fiber-filled concrete FC in layers, and is a member constituted by fiber-reinforced concrete bodies AC joined in layers.

The nozzle 10 includes a large diameter portion 12 and a small diameter portion 14 connected to the tip of the large diameter portion 12 in the extrusion direction P. The large diameter portion 12 and the small diameter portion 14 are formed into a substantially rectangular prism shape, and the hollow portion of the large diameter portion 12 and the hollow portion of the small diameter portion 14 are connected by a connecting portion 16 .

Although the shapes of the large diameter portion 12 and the small diameter portion 14 are not particularly limited, the small diameter portion 14 is preferably columnar and has a cross section of the same size at least along the extrusion direction P. That is, the width w of the inner wall surface 14e of the small diameter portion 14 (that is, the size in the direction perpendicular to the longitudinal direction of the nozzle 10 and the extrusion direction P) is uniform along the longitudinal direction of the nozzle 10 and the extrusion direction P. is preferred. Here, "the plurality of fibers F are aligned" means that the longitudinal directions of the plurality of fibers F are parallel to each other and aligned along an arbitrary direction.

An extrusion port 18 is provided at the tip of the small diameter portion 14 in the extrusion direction P. The width (size, that is, the width in the direction perpendicular to the longitudinal direction of the nozzle 10 and the extrusion direction P) g of the extrusion port 18 is equal to the width w in this embodiment. The width g is preferably shorter than the average length of the plurality of fibers F. From the point of view of ensuring alignment of the plurality of fibers F in the concrete material extruded along the extrusion direction P in the small diameter part 14, the length of the small diameter part 14 (i.e., the longitudinal direction of the nozzle 10 and the direction parallel to the extrusion direction P) It is preferable that the average length of the plurality of fibers F is longer than the average length of the plurality of fibers F.

In the construction process, while extruding the fiber-filled concrete FC from the extrusion port 18 of the nozzle 10 at a predetermined position, so-called three-dimensional printing is performed at a predetermined position and laminated. Extrude fiber-filled concrete FC in layers. At this time, the fiber-filled concrete FC is applied multiple times (for example, 3 times in the Z direction in Fig. 1, 3 times in the Y direction and 2 times in the Z direction in Fig. 2) depending on the shape of the fiber-reinforced concrete member to be manufactured. It may be extruded over several times, or it may be extruded in one step so as to trace the shape of the fiber-reinforced concrete member to be manufactured.

Note that the directions (hereinafter referred to as printing directions) T in which adjacent fiber-filled concrete FCs are three-dimensionally printed in the Z direction (height direction) may be shifted by 90 degrees from each other in plan view. In the present embodiment, the directions parallel to and orthogonal to a floor or ground (not shown) are defined as the X direction and the Y direction, and the direction orthogonal to the floor or ground described above is defined as the Z direction.

The fiber-filled concrete FC hardens over a predetermined period of time, and the surfaces of adjacent fiber-filled concrete FC are joined to each other, and a fiber-reinforced concrete body AC is constructed. The construction process is completed by constructing all the fiber-filled concrete FC extruded in accordance with the shape of the fiber-reinforced concrete member to be manufactured as a fiber-reinforced concrete body AC. In Fig. 1, the lowest layer and the second layer from the bottom in the Z direction are the fiber reinforced concrete body AC, but the fiber reinforced concrete FC of the top layer is in the uncured state of the lowest layer and the second layer from the bottom. If provided, the lowest layer in the Z direction and the second layer from the bottom are fiber-filled concrete FC.

Moreover, although the installation process is performed before the construction process, the generation process and the construction process may be performed in parallel. For example, if the amount of fiber-filled concrete FC that can be accommodated in the hollow part of the nozzle 10 is small compared to the total amount of fiber-filled concrete FC required for manufacturing the fiber-reinforced concrete member to be manufactured, if the amount of fiber-filled concrete FC that can be accommodated in the hollow part of the nozzle 10 is small, The fiber-filled concrete FC may be extruded from the nozzle 10 to a predetermined position in the construction process while the fiber-filled concrete FC is supplied to the hollow part of the nozzle 10.

[Effect]
According to the method for manufacturing a fiber-reinforced concrete member of the present embodiment described above, since it includes the above-mentioned generation step and construction step, by simply extruding the fiber-reinforced concrete FC from the nozzle 10, each fiber-reinforced concrete member FC is formed as shown in FIG. The longitudinal direction of the fibers F can be oriented parallel to the modeling direction, that is, the printing direction T, and the plurality of fibers F can be easily aligned. FIG. 2 illustrates a fiber-reinforced concrete member M1 in which three layers of fiber-reinforced concrete bodies AC are stacked in the Y direction and two layers of fiber-reinforced concrete bodies AC are stacked in the Z direction, with the X direction as the printing direction T. . In the fiber-reinforced concrete member M1, a plurality of fibers F included in each of the plurality of fiber-reinforced concrete bodies AC are aligned parallel to the printing direction T. This makes it possible to avoid non-uniformity of the material due to orientation control, and it is possible to more efficiently exert the reinforcing effect of the fibers against the action of external force along the printing direction T.

Further, according to the method for manufacturing a fiber-reinforced concrete member of the present embodiment, the fiber-reinforced concrete body AC can be constructed by simply extruding the fiber-reinforced concrete FC from the nozzle 10, eliminating the need for formwork and reducing work time and the number of steps. be able to.

Further, according to the method for manufacturing a fiber-reinforced concrete member of the present embodiment, the width g of the extrusion port 18 of the nozzle 10 is shorter than the average length of the plurality of fibers F. By this, when the fiber-filled concrete FC is collected from the hollow part of the large diameter part 12 of the nozzle 10 into the hollow part of the small diameter part 14 via the connecting part 16, it is randomly oriented within the hollow part of the large diameter part 12. As shown in FIG. 1, the plurality of fibers F, which had been previously Furthermore, the fibers F can be reliably oriented in the extrusion direction P before and after the extrusion direction P of the extrusion port 18. As a result, compared to the case where the width of the extrusion port 18 is equal to or greater than the average length of the plurality of fibers F, the plurality of fibers F of the fiber-filled concrete FC extruded from the extrusion port 18 are made parallel to the printing direction T. , can be easily and reliably aligned.

Furthermore, in the method for manufacturing a fiber-reinforced concrete member of the present embodiment, the printing directions T of adjacent fiber-filled concrete FCs in the Z direction can be shifted by 90° from each other in plan view. As a result, as shown in FIG. 3, the longitudinal direction (that is, the orientation) of the fibers F in the fiber-reinforced concrete bodies AC adjacent in the Z direction can be shifted by 90° from each other. As a result, compared to the fiber reinforced concrete member M1 shown in FIG. 2 in which the longitudinal direction of the fibers F is aligned in the X direction, the fiber reinforced concrete member M2 shown in FIG. It can be weakened. That is, even when external forces act in multiple directions (both the X direction and the y direction), the reinforcing effect of the fibers can be exerted and the toughness of the member can be improved.

(Example of fiber reinforced concrete member)
Next, an example of a fiber-reinforced concrete member that can be manufactured by the method for manufacturing a fiber-reinforced concrete member of the above-described embodiment will be described.

[First example]
The fiber-reinforced concrete member M3 shown in FIG. 4 is provided from the outer periphery of the base L0 of the existing column L in contact with the base L0, and improves the toughness of the column L.

As shown in FIG. 5, the column L includes a footing (or stub) S and a reinforced concrete column LC.

The fiber-reinforced concrete member M3 is composed of a plurality of fiber-reinforced concrete bodies AC1 stacked in the Z direction. The fiber-reinforced concrete body AC1 is formed so as to come into contact with the base L0 from the outer periphery of the base L0.

As shown in FIG. 6, when manufacturing the fiber-reinforced concrete member M3, the nozzle 10 of the additive manufacturing device is rotated above the outer periphery of the base L0 in the construction process of the method for manufacturing the fiber-reinforced concrete member of the above-described embodiment. Then, from the nozzle 10, the fiber-reinforced concrete FC is extruded around the entire circumference of the base L0 while being brought into contact with the base L0, thereby constructing the lowest layer of fiber-reinforced concrete body AC1 in the Z direction.

Subsequently, the nozzle 10 is rotated around the outer circumference of the base L0 and above the lowermost fiber-reinforced concrete body AC1, and the fiber-filled concrete FC is extruded from the nozzle 10 to the entire circumference of the base L0 while being brought into contact with the base L0. Then, construct the second layer of fiber-reinforced concrete body AC1 in the Z direction.
In addition, in FIG. 6, the fiber-reinforced concrete body AC1 is from the lowest layer to the third layer from the bottom in the Z direction, but if the fiber-reinforced concrete FC of the top layer is provided in any of these uncured states, The aforementioned uncured layer is fiber-filled concrete FC.

By continuing the same process and constructing a predetermined number of layers of fiber-reinforced concrete body AC1, fiber-reinforced concrete member M3 is completed.

According to the method for manufacturing the fiber-reinforced concrete member M3 described above, by simply extruding the fiber-filled concrete FC from the nozzle 10 without using a formwork or the like, the longitudinal direction of each fiber F is aligned along the outer peripheral surface of the base L0. The fibers F can be oriented parallel to the modeling direction, that is, the printing direction T, and the plurality of fibers F can be easily aligned. Therefore, the fiber-reinforced concrete member M3 that reinforces the toughness of the base L0 of the column L can be easily manufactured.

[Second example]
A fiber-reinforced concrete member M4 shown in FIG. 7 is a modification of the fiber-reinforced concrete member M3 of the first example. In addition, among the configurations of the fiber-reinforced concrete member M4, the same components as those of the fiber-reinforced concrete member M3 are given the same reference numerals as those of the fiber-reinforced concrete member M3, and the explanation thereof will be omitted.

As shown in FIG. 7, in the fiber-reinforced concrete member M4, a plurality of fiber-reinforced concrete bodies AC2, AC3, . (X is any natural number of 2 or more). The fiber-reinforced concrete body AC2 is formed so as to come into contact with the fiber-reinforced concrete body AC1 in the X direction or the Y direction from the outer periphery of the fiber-reinforced concrete body AC1. The fiber-reinforced concrete body AC3 is formed so as to come into contact with the fiber-reinforced concrete body AC2 in the X direction or the Y direction from the outer periphery of the fiber-reinforced concrete body AC2. Furthermore, the fiber-reinforced concrete body ACX is formed so as to come into contact with the fiber-reinforced concrete body AC (X-1) in the X direction or the Y direction from the outer periphery of the fiber-reinforced concrete body AC (X-1). The number of layers in the Z direction of each of the fiber reinforced concrete bodies AC2, AC3, ..., ACX is greater than the number of layers in the Z direction of each of the fiber reinforced concrete bodies AC1, AC2, ..., AC (X-1). small.

When manufacturing the fiber-reinforced concrete member M4, after completing the above-described manufacturing method for the fiber-reinforced concrete member M3, the nozzle 10 of the additive manufacturing device is rotated above the outer periphery of the lowermost fiber-reinforced concrete body AC1, and the nozzle 10 From there, the fiber-filled concrete FC is brought into contact with the lowermost fiber-reinforced concrete body AC1 and extruded around the entire circumference of the lowermost fiber-reinforced concrete body AC1 to construct the lowermost fiber-reinforced concrete body AC2 in the Z direction. Thereafter, fiber-reinforced concrete bodies AC2 are laminated in the Z direction in the same manner as in the layering process of fiber-reinforced concrete bodies AC1 in the method for manufacturing fiber-reinforced concrete members M3.

Subsequently, the nozzle 10 is rotated above the outer periphery of the fiber-reinforced concrete body AC2, and as in the manufacturing process of a plurality of fiber-reinforced concrete bodies AC2, the nozzle 10 is brought into contact with the fiber-reinforced concrete body AC2 and rotates around the outer periphery of the fiber-reinforced concrete body AC2. A plurality of fiber-reinforced concrete bodies AC3 are laminated in the section. In this way, the arrangement and stacking of the fiber-reinforced concrete body AC is repeated, and finally, the nozzle 10 is circulated above the outer periphery of the fiber-reinforced concrete body AC (X-1), and the fiber-reinforced concrete body AC (X-1) is Fiber-reinforced concrete body ACX is constructed around the outer periphery of fiber-reinforced concrete body AC (X-1) while making contact with it. Through these steps, the fiber-reinforced concrete member M4 is completed.

According to the method for manufacturing the fiber-reinforced concrete member M4 described above, each fiber F is produced by simply extruding the fiber-filled concrete FC from the same nozzle 10 used when manufacturing the fiber-reinforced concrete member M3, without using a formwork or the like. The longitudinal direction can be oriented parallel to the modeling direction along the outer peripheral surface of the base L0, that is, the printing direction T, and the plurality of fibers F can be easily aligned. As shown in Fig. 7, the width and height of each fiber-reinforced concrete body AC1, AC2, AC3, ..., ACX are adjusted appropriately, and curved surfaces ( A fiber-reinforced concrete member M4 having a shape along the two-dot chain line in FIG. 7 can be constructed. That is, a mechanically optimal structure (fiber-reinforced concrete member) can be constructed based on additive manufacturing technology as in this embodiment. Moreover, the toughness of the base L0 of the existing column L is reinforced, and even a fiber-reinforced concrete member M4 having a different shape from the fiber-reinforced concrete member M3 can be easily manufactured. Note that the nozzles 10 used in the manufacturing method of the fiber-reinforced concrete members M3 and M4 may be different from each other.

[Third example]
A fiber-reinforced concrete member M5 shown in FIG. 8 is a modification of the fiber-reinforced concrete member M3 of the first example. In addition, among the configurations of the fiber-reinforced concrete member M4, the same components as those of the fiber-reinforced concrete member M3 are given the same reference numerals as those of the fiber-reinforced concrete member M3, and the explanation thereof will be omitted.

As shown in FIG. 8, in the fiber-reinforced concrete member M5, a plurality of fiber-reinforced concrete bodies AC1 are constructed at intervals with respect to the base L0 of the column L in the X direction or the Y direction. In the region R between the base L0 and the fiber-reinforced concrete member M5, a connecting bar LB2 is provided so as to be buried in the footing S from above the footing S along the vertical direction. The connecting bar LB2 is a substantially linear reinforcing bar, and is installed in an annular manner so as to surround the outer periphery of the column L at a predetermined interval from the outer surface of the column L. The tether LB2 does not necessarily need to be embedded in the footing S, and may just be placed on the footing S. The length of the connecting bar LB2 above the footing G is approximately the same as that of the fiber-reinforced concrete member M5. A concrete material (not shown) that does not contain fibers F or fiber-containing concrete FC is poured into region R around reinforcing bar LB2.

The fiber-reinforced concrete member M5 can be manufactured by the same manufacturing process as the fiber-reinforced concrete member M3, except that the fiber-reinforced concrete FC is not brought into contact with the base L0 and is spaced apart from the base L0 in the X direction or the Y direction. In addition, when manufacturing the structure shown in FIG. 8 excluding the columns L, connecting bars LB2 are buried or arranged in the region R, and after manufacturing the fiber reinforced concrete member M5, concrete not containing fibers F in the region R, Alternatively, concrete FC containing fibers is poured and hardened. Note that the connecting bars LB2 may be arranged before, at the same time as, or after the fiber-reinforced concrete member M5 is manufactured. When embedding the connecting bars LB2 inside the footing S, it is easier to arrange the connecting bars LB2 before manufacturing the fiber-reinforced concrete member M5.

According to the method for manufacturing the fiber-reinforced concrete member M5 described above, it is possible to easily control the orientation of the fibers F and manufacture the fiber-reinforced concrete member M5 that reinforces the toughness of the existing column L, similarly to the fiber-reinforced concrete member M3. . Further, such a manufacturing method can be easily implemented in combination with a step of pouring concrete material that does not include the connecting reinforcement LB2 or the fibers F before, simultaneously with, or after manufacturing the fiber-reinforced concrete member M5.

Note that the connecting bars LB2 are constructed for the purpose of improving the bending strength of the concrete member constructed in the region R, and can be omitted if the above-mentioned purpose is unnecessary.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications may be made within the scope of the gist of the present invention described within the scope of the claims. Changes are possible.

For example, the shape of the extrusion port 18 of the nozzle 10 (that is, the shape when viewed along the extrusion direction P) is not limited to a substantially rectangular shape, but may be a circle, a polygon of five or more, or the like. The shape of the extrusion port 18 is reflected in the shape of the fiber-filled concrete FC and fiber-reinforced concrete body AC extruded from the extrusion port 18, so it is changed as appropriate according to the shape of the fiber-filled concrete FC and fiber-reinforced concrete body AC. . Further, the nozzle 10 may have a small diameter portion 14 that is detachable from the large diameter portion 12, and as described above, the nozzle 10 has a plurality of small diameter portions with different shapes depending on the shape of the fiber-filled concrete FC or the fiber-reinforced concrete body AC. The portion 14 may be replaceable.

Furthermore, in the fiber-reinforced concrete member M3, the printing directions T1 and T2 do not need to intersect with each other at 90° in plan view, and may intersect with each other at any angle. By changing the angle at which the printing directions T1 and T2 intersect with each other, the mechanical properties of the fiber-reinforced concrete body AC can be adjusted.

Furthermore, in the fiber-reinforced concrete member M4, the number of layers in the Z direction of each of the fiber-reinforced concrete bodies AC1, AC2, AC3, ..., ACX decreases as the distance from the base L0 increases; The number of layers of the bodies AC1, AC2, AC3, . . . , ACX is not particularly limited. In the method for manufacturing a fiber-reinforced concrete member according to the embodiment described above, the number of layers and arrangement of the fiber-reinforced concrete body can be freely set and changed.

10 Nozzle 18 Extrusion port F Fiber FC Fiber reinforced concrete AC, AC1, AC2, AC3, AC (X-1), ACX Fiber reinforced concrete body M1, M2, M3, M4, M5 Fiber reinforced concrete member

The method for producing a fiber-reinforced concrete member of the present invention involves extruding fiber-reinforced concrete made by mixing a plurality of fibers into uncured concrete or mortar to a predetermined position from a nozzle of an additive manufacturing device to construct a fiber-reinforced concrete body. The nozzle includes a large diameter part and a small diameter part provided at the tip of the large diameter part in the extrusion direction, and the nozzle has a small diameter part provided at the tip of the small diameter part in the extrusion direction. An extrusion port is formed, and the length of the small diameter portion of the nozzle is longer than the average length of the plurality of fibers.

In the method for manufacturing a fiber-reinforced concrete member of the present invention, it is preferable to construct the fiber-reinforced concrete body around the outer periphery of a column .

Claims (2)

A fiber-filled concrete production step of mixing a plurality of fibers into uncured concrete or mortar to produce fiber-filled concrete;
a fiber-reinforced concrete body construction step of extruding the fiber-filled concrete from a nozzle of an additive manufacturing device to a predetermined position to construct a fiber-reinforced concrete body;
A method for producing a fiber-reinforced concrete member, comprising: The size of the extrusion opening of the nozzle is shorter than the average length of the plurality of fibers.
A method for manufacturing a fiber-reinforced concrete member according to claim 1.

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