JP2023014154A - Manufacturing method of fiber reinforced concrete member - Google Patents

Abstract

PROBLEM TO BE SOLVED: 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

COPYRIGHT: (C)2023,JPO&INPIT

Description

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

In recent years, attention has been focused on fiber-reinforced concrete, which is made by mixing a predetermined amount of fibers into uncured concrete or mortar (hereinafter collectively referred to as concrete materials) to increase the toughness of the concrete and reinforce the concrete. ing. Fiber reinforced concrete is widely used for spraying of tunnels, pavement of roads, earth floor concrete in buildings, foundation structures and legs, secondary concrete products, and the like. The type of fiber to be mixed into the concrete material is appropriately selected in consideration of the purpose of use of the fiber-reinforced concrete, the type of concrete material into which the fiber is mixed, and the like.

For example, Patent Literature 1 discloses an anti-slip structure using high-strength steel fiber reinforced concrete. This non-slip structure can be applied to join steel girders of bridges and reinforced concrete piers.

JP 2011-196098 A

The high-strength steel fiber reinforced concrete described in Patent Document 1 is completed by general wet curing without applying special curing after filling into the formwork including the steel shell and placing. be able to. However, when constructing the anti-slip structure described in Patent Document 1, if the high-strength steel fiber reinforced concrete having fluidity immediately after kneading is filled in the steel shell (formwork), the unhardened concrete will be damaged. In some cases, the fibers were oriented in a direction different from the desired direction along with the flow. That is, conventional fiber-reinforced concrete has a problem that it is difficult to control the orientation of fibers. If the direction of the fibers is different from the desired direction or if the orientation of the fibers is uneven, there is a possibility that the mechanical performance of the fiber-reinforced concrete after curing and the structure using the fiber-reinforced concrete will be affected.

One method of addressing the above-mentioned problem is to place straighteners with rotatable discs into the poured concrete during or immediately after pouring the fiber-reinforced concrete (i.e., when it is in an uncured state). A method has been proposed in which the fiber is moved along the desired direction by inserting and rotating the disk. However, this method is complicated because it requires time and effort to move the rectifier after placing the concrete.

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

The method for producing a fiber-reinforced concrete member according to the present invention includes a fiber-containing concrete production step of mixing a plurality of fibers into uncured concrete or mortar to produce fiber-containing concrete, and a fiber-reinforced concrete body construction step for constructing the fiber-reinforced concrete body by extruding it from the mold to a predetermined position.

According to the method for producing a fiber-reinforced concrete member of the present invention, the fibers are oriented in the printing direction simply by extruding the fiber-containing concrete from the nozzle of the additive manufacturing device (hereinafter sometimes simply referred to as the nozzle). It is easier to align multiple fibers. This makes it easy to control the orientation of the fibers in the fiber-reinforced concrete member made up of the fiber-reinforced concrete body.

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

According to the method for producing a fiber-reinforced concrete member of the present invention, in the process in which the fiber-containing concrete is gathered near the extrusion port of the nozzle and extruded from the extrusion port, the longitudinal direction of the fibers is a direction substantially perpendicular to the plane including the extrusion port. , the plurality of fibers are more reliably aligned 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 producing a fiber-reinforced concrete member of the present invention, the orientation of fibers can be easily controlled.

It is a schematic diagram for explaining a manufacturing method of a fiber reinforced concrete member concerning one embodiment of the present 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 one embodiment of the present invention; FIG. FIG. 4 is a perspective view of another fiber reinforced concrete member that can be produced by a method for producing a fiber reinforced concrete member according to an embodiment of the invention; FIG. 4 is a plan view of yet 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; 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 one embodiment of the present invention, and is a cross-sectional view corresponding to the case of arrows taken along line DD′ shown in FIG. 4 ; be. FIG. 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 one embodiment of the present invention, and is a cross-sectional view corresponding to the arrow view taken along line DD' shown in FIG. 4; is.

An embodiment of a method for manufacturing a fiber-reinforced concrete member to which the present invention is applied will be described below with reference to the drawings.

(Manufacturing method of fiber-reinforced concrete member)
The method for manufacturing a fiber-reinforced concrete member of the present embodiment includes a fiber-containing concrete generation step (hereinafter, sometimes simply referred to as a generation step), an installation step, and a fiber-reinforced concrete body construction step (hereinafter, sometimes simply referred to as a construction step). There is) and. Each step will be described below.

[Generation process]
In the forming step, the concrete material is mixed with a plurality of fibers to form fiber-filled concrete. The concrete material used in the present embodiment is concrete or mortar having moderate fluidity in an uncured state, and known materials can be used. Furthermore, it is preferable that the material be a material that cures moderately in the lamination process and develops high strength in a short time.

The fibers to be mixed in the concrete material are short fibers made of metal or resin. Although the diameter of the fiber used in the present invention is not limited, the diameter of the short fiber is preferably 0.005 mm or more and 1.0 mm or less. The average length of the plurality of fibers is preferably 3 mm or more and 30 mm or less, for example. It should be noted that the longer the length of the fibers with respect to the inner diameter of the extrusion port 18 of the nozzle 10 to be described later, the more reliably the fibers are aligned.

Fibers are preferably mixed in, for example, 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-containing concrete can maintain its shape in the air and to the extent that drying shrinkage cracking of the fiber-containing concrete can be suppressed. In order to exhibit the tensile toughness of the fiber-reinforced concrete body against the external force after the fiber-containing concrete hardens, it is preferable that the fiber is mixed in the concrete material in an amount of 1.0% by volume or more.

[Installation process]
In accordance with the shape of the fiber-reinforced concrete member to be manufactured, an additional manufacturing apparatus having the nozzle 10 shown in FIG. shown) at the construction site. In addition, additional rails and lifts may be provided on-site to make the additional manufacturing device movable and to change the X- and Y-direction positions and the Z-direction height of the additional manufacturing device.

[Construction process]
In the construction process, as shown in FIG. 1, the fiber-containing concrete FC generated in the generating process is supplied to the additive manufacturing apparatus, and the fiber-reinforced concrete FC is extruded from a nozzle 10 of the additive manufacturing apparatus to a predetermined position to form fiber-reinforced concrete. Construct the body AC. The fiber-reinforced concrete member to be manufactured in the present embodiment is a member formed by joining fiber-containing concrete FC in layers, and is a member configured by layer-joined fiber-reinforced concrete bodies AC.

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. As shown in FIG. The large-diameter portion 12 and the small-diameter portion 14 are formed in a substantially quadrangular 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 12 and the small diameter portion 14 are preferred because the plurality of fibers F in the uncured concrete C or the mortar M (that is, the concrete material) are more reliably aligned. 14 are preferably columns having cross sections of the same size at least along the direction of extrusion 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) must be uniform along the longitudinal direction of the nozzle 10 and the extrusion direction P. is preferred. Here, "a 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. As shown in FIG. The width (size, ie, the width in the longitudinal direction of the nozzle 10 and the direction perpendicular to 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. In order to ensure alignment of the plurality of fibers F in the concrete material extruded along the extrusion direction P at the small diameter portion 14, the length of the small diameter portion 14 (i.e., the longitudinal direction of the nozzle 10 and the size) is preferably longer than the average length of the plurality of fibers F.

In the construction process, while extruding the fiber-containing concrete FC from the extrusion port 18 of the nozzle 10 at a predetermined position, so-called three-dimensional printing is performed at the predetermined position and stacked. Extrusion of fiber-filled concrete FC in layers. At this time, the fiber-containing concrete FC is applied a plurality of times (for example, three times in the Z direction in FIG. 1, three times in the Y direction and two times in the Z direction in FIG. 2) in accordance with the shape of the fiber-reinforced concrete member to be manufactured. It may be extruded several times), or may be extruded once so as to trace the shape of the fiber-reinforced concrete member to be manufactured.

In addition, the directions T in which adjacent fiber-containing concrete FCs are three-dimensionally printed in the Z direction (height direction) (hereinafter referred to as print directions) may be shifted from each other by 90° in plan view. In this embodiment, directions parallel to and perpendicular to the floor or ground (not shown) are defined as the X direction and the Y direction, and the direction perpendicular to the floor or ground is defined as the Z direction.

The fiber-containing concrete FC hardens with the lapse of a predetermined time, the surfaces of the adjacent fiber-containing concrete FC are joined together, and the fiber-reinforced concrete body AC is constructed. The construction process is completed by constructing all of the fiber-reinforced concrete body AC that has been extruded in accordance with the shape of the fiber-reinforced concrete member to be manufactured. 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 uppermost layer of the fiber-reinforced concrete body FC is used in the uncured state of each 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, when the amount of fiber-containing concrete FC that can be accommodated in the hollow part of the nozzle 10 is small with respect to the total amount of fiber-containing concrete FC required for manufacturing the fiber-reinforced concrete member to be manufactured, The fiber-containing concrete FC may be extruded to a predetermined position from the nozzle 10 in the construction process while supplying the fiber-containing concrete FC to the hollow portion of the nozzle 10 .

[Effect]
According to the manufacturing method of the fiber-reinforced concrete member of the present embodiment described above, since the above-described production step and construction step are provided, the fiber-reinforced concrete FC is simply extruded from the nozzle 10, and the respective fibers are formed as shown in FIG. The longitudinal direction of F can be oriented parallel to the modeling direction, ie, the printing direction T, and a 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 laminated in the Y direction and two layers of fiber reinforced concrete bodies AC are laminated in the Z direction, with the X direction being the printing direction T. . In the fiber-reinforced concrete member M1, a plurality of fibers F contained in each of the plurality of fiber-reinforced concrete bodies AC are aligned parallel to the printing direction T. As shown in FIG. As a result, non-uniformity of the material due to orientation control can be avoided, and the reinforcing effect of the fibers against the action of external force along the printing direction T can be exhibited more efficiently.

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

Moreover, 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. As a result, when the fiber-containing concrete FC is collected from the hollow portion of the large-diameter portion 12 of the nozzle 10 to the hollow portion of the small-diameter portion 14 via the connecting portion 16, it is randomly oriented in the hollow portion of the large-diameter portion 12. The plurality of fibers F that have been oriented can be substantially oriented sequentially along the extrusion direction P, as shown in FIG. Furthermore, the fibers F can be reliably oriented in the extrusion direction P before and after the extrusion port 18 . As a result, the plurality of fibers F of the fiber-containing concrete FC extruded from the extrusion port 18 are made parallel to the printing direction T 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. , can be easily and reliably aligned.

In addition, in the method for manufacturing a fiber-reinforced concrete member of the present embodiment, the print directions T of adjacent fiber-containing concrete FC in the Z direction can be shifted from each other by 90° in plan view. As a result, as shown in FIG. 3, the longitudinal directions (that is, the orientations) of the fibers F in the fiber-reinforced concrete bodies AC adjacent in the Z direction can be shifted from each other by 90°. As a result, compared to the fiber reinforced concrete member M1 shown in FIG. 2, for example, where the longitudinal direction of the fibers F is aligned in the X direction, the fiber reinforced concrete member M2 shown in FIG. can weaken. That is, even when external forces act in multiple directions (both the X direction and the y direction), the reinforcement effect of the fibers can be exhibited and the toughness of the member can be increased.

(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 embodiment will be described.

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

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 laminated in the Z direction. The fiber-reinforced concrete body AC1 is formed so as to come into contact with the base portion L0 from the outer periphery thereof.

As shown in FIG. 6, when manufacturing the fiber-reinforced concrete member M3, the nozzle 10 of the additional manufacturing device is rotated above the outer peripheral portion 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 pushed out from the nozzle 10 to the entire circumference of the base L0 while being brought into contact with the base L0, thereby constructing the lowermost layer of the fiber-reinforced concrete body AC1 in the Z direction.

Subsequently, the nozzle 10 is rotated around the outer periphery of the base L0 and above the lowermost fiber-reinforced concrete body AC1, and the fiber-containing concrete FC is extruded from the nozzle 10 to the entire circumference of the base L0 while being in contact with the base L0. Then, the second layer of fiber-reinforced concrete body AC1 in the Z direction is constructed.
In FIG. 6, the lowest layer to the third layer from the bottom in the Z direction are the fiber-reinforced concrete body AC1. Said uncured layer is the fiber-filled concrete FC.

A fiber-reinforced concrete member M3 is completed by continuing the same steps and constructing a predetermined number of layers of the fiber-reinforced concrete body AC1.

According to the method for manufacturing the fiber-reinforced concrete member M3 described above, the fiber-reinforced concrete FC is extruded from the nozzle 10 without using a formwork or the like. A plurality of fibers F can be oriented parallel to the modeling direction, ie, the printing direction T, and 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]
As a modification of the fiber-reinforced concrete member M3 of the first example, there is a fiber-reinforced concrete member M4 shown in FIG. Among the configurations of the fiber-reinforced concrete member M4, the configurations common to the fiber-reinforced concrete member M3 are assigned the same reference numerals as those of the fiber-reinforced concrete member M3, and the description thereof is omitted.

As shown in FIG. 7, in the fiber-reinforced concrete member M4, fiber-reinforced concrete bodies AC2, AC3, . (X is any natural number equal to or greater than 2). The fiber-reinforced concrete body AC2 is formed so as to contact 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 contact the fiber-reinforced concrete body AC2 in the X direction or the Y direction from the outer circumference of the fiber-reinforced concrete body AC2. Furthermore, the fiber-reinforced concrete body ACX is formed so as to contact the fiber-reinforced concrete body AC(X-1) in the X direction or the Y direction from the outer circumference 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, . small.

When manufacturing the fiber-reinforced concrete member M4, after completing the manufacturing method of the fiber-reinforced concrete member M3 described above, the nozzle 10 of the additional manufacturing device is rotated above the outer peripheral portion of the fiber-reinforced concrete body AC1 of the lowermost layer, and the nozzle 10 Then, the fiber-reinforced concrete FC is pushed out all around the lowermost fiber-reinforced concrete body AC1 while being brought into contact with the lowermost fiber-reinforced concrete body AC1 to construct the lowermost layer fiber-reinforced concrete body AC2 in the Z direction. After that, the fiber reinforced concrete bodies AC2 are laminated in the Z direction in the same manner as the layering step of the fiber reinforced concrete bodies AC1 in the manufacturing method of the fiber reinforced concrete member M3.

Subsequently, the nozzle 10 is circulated above the outer periphery of the fiber-reinforced concrete bodies AC2, and is brought into contact with the fiber-reinforced concrete bodies AC2 in the same manner as in the manufacturing process of the plurality of fiber-reinforced concrete bodies AC2. A plurality of fiber-reinforced concrete bodies AC3 are laminated on the part. The arrangement and lamination of the fiber reinforced concrete body AC are repeated in this way, and finally, the nozzle 10 is circulated above the outer peripheral portion of the fiber reinforced concrete body AC(X-1), and the fiber reinforced concrete body AC(X-1) and the The fiber-reinforced concrete body ACX is constructed on the outer peripheral portion of the fiber-reinforced concrete body AC(X-1) while keeping them in contact with each other. 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, the fiber-reinforced concrete member M3 is manufactured by simply extruding the fiber-reinforced concrete FC from the same nozzle 10 as in the manufacturing of 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 of the fiber-reinforced concrete bodies AC1, AC2, AC3, . A fiber-reinforced concrete member M4 having a shape along the two-dot chain line in FIG. 7 can be constructed. That is, based on the additive manufacturing technology as in this embodiment, a mechanically optimum structure (fiber-reinforced concrete member) can be constructed. Further, even a fiber-reinforced concrete member M4 having a shape different from that of the fiber-reinforced concrete member M3 by reinforcing the toughness of the base L0 of the existing column L 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]
As a modification of the fiber-reinforced concrete member M3 of the first example, there is a fiber-reinforced concrete member M5 shown in FIG. Among the configurations of the fiber-reinforced concrete member M4, the configurations common to the fiber-reinforced concrete member M3 are assigned the same reference numerals as those of the fiber-reinforced concrete member M3, and the description thereof is omitted.

As shown in FIG. 8, in the fiber-reinforced concrete member M5, a plurality of fiber-reinforced concrete bodies AC1 are constructed with a gap from the base L0 of the column L in the X direction or the Y direction. In a region R between the base portion L0 and the fiber-reinforced concrete member M5, a connecting bar LB2 is provided so as to be buried inside 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 annularly so as to surround the outer circumference of the pillar L at a predetermined distance from the outer surface of the pillar L. As shown in FIG. The connecting bar LB2 does not necessarily have to be embedded in the footing S, and may be arranged on the footing S only. The length of the connecting bar LB2 above the footing G is substantially the same as that of the fiber-reinforced concrete member M5. Concrete material (not shown) containing no fiber F or fiber-containing concrete FC is driven into the region R with the reinforcing bar LB2 as the core.

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 portion L0 and is spaced from the base portion L0 in the X direction or the Y direction. Further, when manufacturing the structure shown in FIG. Alternatively, the fiber-containing concrete FC is poured and hardened. The connecting bars LB2 may be arranged before, at the same time as, or after the fiber-reinforced concrete member M5 is manufactured. When the connecting bars LB2 are embedded 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 manufacture the fiber-reinforced concrete member M5 that easily controls the orientation of the fibers F and reinforces the toughness of the existing column L, similarly to the fiber-reinforced concrete member M3. . In addition, such a manufacturing method can be easily implemented in combination with a step of placing a concrete material that does not contain connecting bars LB2 or fibers F before, during, or after manufacturing the fiber-reinforced concrete member M5.

The connecting bar LB2 is 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 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 can be made within the scope of the gist of the present invention described in the scope of the claims. Change is 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, and may be a circle, a polygon with five or more polygons, or the like. Since the shape of the extrusion port 18 is reflected in the shape of the fiber-containing concrete FC and the fiber-reinforced concrete body AC extruded from the extrusion port 18, it is appropriately changed according to the shape of the fiber-containing concrete FC and the fiber-reinforced concrete body AC. . Further, the nozzle 10 may have a small diameter portion 14 detachable from the large diameter portion 12, and as described above, a plurality of small diameter portions having different shapes according to the shape of the fiber-containing concrete FC or the fiber-reinforced concrete body AC. The portion 14 may be replaceable.

Further, in the fiber-reinforced concrete member M3, the print directions T1 and T2 do not have to intersect each other at 90° in plan view, and may intersect at any angle. The mechanical properties of the fiber-reinforced concrete body AC can be adjusted by changing the angle at which the print directions T1 and T2 cross each other.

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, . The number of layers of bodies AC1, AC2, AC3, . . . , ACX is not particularly limited. In the method of manufacturing a fiber-reinforced concrete member according to the above embodiment, the number of layers and arrangement of fiber-reinforced concrete bodies can be freely set and changed.

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

The method for producing a fiber-reinforced concrete member according to the present invention includes a fiber-containing concrete production step of mixing a plurality of fibers into uncured concrete or mortar to produce fiber-containing concrete, a fiber-reinforced concrete body construction step for constructing a fiber-reinforced concrete body by extruding it to a predetermined position from the It is characterized by performing construction while shifting 90 degrees from each other .

In the method for producing a fiber-reinforced concrete member of the present invention, it is preferable that the fibers have a diameter of 0.005 mm or more and 1.0 mm or less, and an average length of the fibers of 3 mm or more and 30 mm or less .

In the method for producing a fiber-reinforced concrete member of the present invention, the width of the extrusion port of the nozzle is shorter than the average length of the plurality of fibers, and the length of the extrusion port of the nozzle is longer than the average length of the plurality of fibers. is preferred.

Claims (2)

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

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