Method for scattering reinforcing fibers, method for pouring fiber-reinforced concrete, injection device and scattering apparatus

Abstract

This invention provides a method for distributing reinforcing fibers that can avoid the oversupply of reinforcing fibers. [Solution] A method for scattering reinforcing fibers 4, which are long reinforcing fibers that will be used as material for fiber-reinforced concrete 2, from above toward the surface layer of concrete 3, the method comprising a reinforcing fiber scattering step S20 in which a plurality of reinforcing fibers 4 are scattered at an inclination with respect to the vertical direction so that the plurality of reinforcing fibers 4 are arranged on the surface layer of concrete 3 facing a set direction set for each reinforcing fiber 4.

Description

Technical Field

[0001] The present invention relates to a reinforcing fiber spraying method for spraying reinforcing fibers onto concrete, a placing method for fiber-reinforced concrete, an injector, and a spraying device.

Background Art

[0002] Conventionally, techniques for fiber-reinforced concrete have been known. For example, it is as described in Patent Document 1.

[0003] Patent Document 1 describes a method for producing fiber-reinforced concrete by adding reinforcing fibers to concrete (fresh concrete) before placing and kneading. According to such fiber-reinforced concrete, surface cracking of the concrete can be prevented.

[0004] [[ID=X]] However, in the method of kneading the reinforcing fibers, since the reinforcing fibers are supplied to the entire concrete, the reinforcing fibers are also included in the portion of the concrete that does not contribute to crack prevention (the portion other than the surface layer). Therefore, it is assumed that the amount of reinforcing fibers contained in the concrete increases. Thus, in order to reduce the amount of reinforcing fibers contained in the concrete, it is also conceivable to adopt a method of scattering the reinforcing fibers on the surface layer of the concrete after placing.

[0005] However, in either case of adopting the method of kneading the reinforcing fibers or the method of scattering the reinforcing fibers, it is difficult to control the orientation of the reinforcing fibers added to the concrete. Therefore, considering that the orientation of the reinforcing fibers may be biased, it is necessary to supply more reinforcing fibers to the concrete than the minimum required amount. If an excessive amount of reinforcing fibers is supplied to the concrete, there is a risk of generating fiber balls (lumps of reinforcing fibers), which may lead to a deterioration in the performance of the concrete. Therefore, it is desirable to avoid excessive supply of reinforcing fibers.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2019-151019 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] This invention has been made in view of the above circumstances, and the problem it aims to solve is to provide a method for scattering reinforcing fibers, a method for pouring fiber-reinforced concrete, an injection device, and a scattering device that can avoid the excessive supply of reinforcing fibers. [Means for solving the problem]

[0008] The problems that this invention aims to solve are as described above, and the means for solving these problems will now be explained.

[0009] That is, claim 1 is a method for scattering reinforcing fibers, which are long reinforcing fibers to be used as material for fiber-reinforced concrete, from above toward the surface layer of concrete, and includes a scattering step of scattering a plurality of reinforcing fibers at an inclination with respect to the vertical direction such that the plurality of reinforcing fibers are arranged on the surface layer of the concrete facing a set direction set for each reinforcing fiber.

[0010] In claim 2, the setting direction is set such that the longitudinal direction of the scattered plurality of reinforcing fibers is oriented toward the radial direction of a reference circle in a plan view, and the circumferential phase difference between adjacent reinforcing fibers in the circumferential direction of the reference circle is within a predetermined range.

[0011] In claim 3, the circumferential phase difference between adjacent reinforcing fibers in the circumferential direction of the reference circle is within 60°.

[0012] In claim 4, the scattering step involves scattering a plurality of reinforcing fibers such that a plurality of groups of reinforcing fibers are formed, which are a plurality of reinforcing fibers arranged in the setting direction based on one reference circle.

[0013] Claim 5 is a method for pouring fiber-reinforced concrete, which includes the reinforcing fiber scattering method described in any one of Claims 1 to 4, comprising a concrete pouring step of pouring the concrete onto a target, wherein in the scattering step, a plurality of the reinforcing fibers are scattered on the surface layer of the concrete poured in the concrete pouring step.

[0014] Claim 6 provides an injection device for dispersing elongated reinforcing fibers, which are to be used as material for fiber-reinforced concrete, onto the surface of concrete from above, the device having a plurality of paths formed to allow injection of a plurality of reinforcing fibers, which are inclined with respect to the vertical direction, so that the plurality of reinforcing fibers are arranged on the surface of the concrete facing a set direction set for each reinforcing fiber.

[0015] In claim 7, the plurality of paths are formed in a shape in which the lower end faces toward the center of the injection unit in a plan view, and is inclined to twist in the circumferential direction in a plan view.

[0016] Claim 8 comprises an injection unit on which the injection device described in claim 6 or claim 7 is provided, and a fiber storage unit capable of accommodating a plurality of reinforcing fibers supplied to the path of the injection device. [Effects of the Invention]

[0017] The present invention provides the following effects:

[0018] In this invention, it is possible to avoid the excessive supply of reinforcing fibers. [Brief explanation of the drawing]

[0019] [Figure 1]Perspective view schematically showing a spraying device according to an embodiment of the present invention. [Figure 2] Front cross-sectional view showing the spraying device. [Figure 3] Perspective view showing an injector. [Figure 4] (a) Plan view showing the injector. (b) Bottom view showing the injector. [Figure 5] Flowchart showing a method for placing fiber-reinforced concrete. [Figure 6] Front cross-sectional view showing a state where reinforcing fibers are grounded on the surface of concrete in the reinforcing fiber spraying process. [Figure 7] Front cross-sectional view showing a state where the spraying device is pulled up in the reinforcing fiber spraying process. [Figure 8] Plan view showing reinforcing fibers sprayed on the surface layer of concrete. <� [Figure 9] Plan view showing an example where reinforcing fibers are sprayed on a predetermined area of concrete.

Mode for Carrying Out the Invention

[0020] Hereinafter, the spraying device 1 according to an embodiment of the present invention will be described.

[0021] The spraying device 1 shown in FIGS. 1 and 2 is for spraying reinforcing fibers 4, which are materials for fiber-reinforced concrete 2, on the surface layer of concrete 3 after placement. <�

[0022] First, fiber-reinforced concrete 2 will be described below. The fiber-reinforced concrete 2 shown in FIG. 8 is obtained by adding reinforcing fibers 4 to concrete 3. According to the fiber-reinforced concrete 2, it is possible to suppress cracks generated on the surface. In the present embodiment, an example of forming a slab of a building using the fiber-reinforced concrete 2 will be described. Also, in the present embodiment, the fiber-reinforced concrete 2 is formed by spraying the reinforcing fibers 4 on the surface layer of the concrete 3 (fresh concrete) after placement and before coagulation. The detailed description of the placement of the fiber-reinforced concrete 2 will be described later.

[0023] The reinforcing fibers 4 shown in Figures 6 to 8 are long, fibrous materials. In this embodiment, the reinforcing fibers 4 are short fibers with a length of several tens of millimeters (for example, about 30 mm) and a thickness (outer diameter) of about 0.5 to 1 mm (for example, about 0.7 mm). The length and thickness values ​​of the reinforcing fibers 4 are not limited to the examples described above, and various values ​​can be used. Various fibers can be used as reinforcing fibers 4, such as polyolefin fibers like polypropylene, aramid fibers, steel fibers, carbon fibers, etc.

[0024] Next, the spraying device 1 shown in Figures 1 and 2 will be described. The spraying device 1 is designed to house reinforcing fibers 4 and to be able to spray the housed reinforcing fibers 4 onto concrete 3. The spraying device 1 can be, for example, a roughly rectangular parallelepiped shape with a side length of several hundred mm (for example, about 200 mm) in plan view. The spraying device 1 comprises a fiber stock section 10 and an injection section 20.

[0025] The fiber stock section 10 is a part that can accommodate the reinforcing fibers 4. The fiber stock section 10 constitutes the upper part of the spreading device 1. The fiber stock section 10 is formed in a roughly box shape that opens upward. The depth dimension (vertical dimension) of the fiber stock section 10 is formed to be greater than the length of the reinforcing fibers 4. Inside the fiber stock section 10, the reinforcing fibers 4 are housed with their length generally oriented vertically (see Figure 6).

[0026] The injection section 20 is the part that can inject the reinforcing fibers 4 housed in the fiber stock section 10 downwards. The injection section 20 constitutes the lower part of the spraying device 1. The injection section 20 has holes 20a that penetrate vertically so that an injector 21, which will be described later, can be installed there. The injection section 20 is formed in a shape that narrows in diameter as it goes downwards. As shown in Figure 1, the injection section 20 has multiple rows of holes 20a that are spaced apart front to back, and multiple rows that are spaced apart left to right. In the example shown, the number of holes 20a in each row adjacent to each other in the left to right direction and the front to back spacing are different from each other.

[0027] The injectors 21 shown in Figures 3 and 4 are capable of dispersing multiple reinforcing fibers 4 in a generally radial pattern. The injectors 21 are formed in a roughly frustoconical shape, with the diameter decreasing towards the bottom. The vertical dimension of the injectors 21 is approximately the length of the reinforcing fibers 4. As shown in Figure 6, the injectors 21 are housed inside the holes 20a. Multiple injectors 21 are arranged so as to be located in each of the holes 20a. Note that some of the injectors 21 are omitted from the illustration in Figure 1. Also, in Figure 2, the injectors 21 are shown as filled in.

[0028] As shown in Figures 3 and 4(a), the injector 21 has multiple paths 21a that penetrate vertically to allow the reinforcing fibers 4 to pass through. In this embodiment, an example is shown in which eight paths 21a are formed. Each path 21a is formed at a constant interval in the circumferential direction of the injector 21 in a plan view (see Figure 4(a)). In this embodiment, each path 21a is formed such that the phase difference between adjacent paths 21a in the circumferential direction of the injector 21 in a plan view is approximately 45°.

[0029] The path 21a has an upper opening 21b that opens on the upper surface of the injector 21 and a lower opening 21c that opens on the lower surface of the injector 21. For the sake of clarity, in Figure 4, the upper opening 21b and lower opening 21c of one path 21a are shown filled in. The path 21a is formed in a shape in which the inner diameter gradually decreases as it goes downwards. Therefore, the inner diameter of the lower opening 21c is smaller than the inner diameter of the upper opening 21b.

[0030] As shown in Figures 3 and 4(a), each path 21a is formed in a sloping shape so that it approaches the center point P1 of the injector 21 in a plan view as it extends downwards. Furthermore, as shown in Figure 4, each path 21a is formed such that the upper opening 21b and the lower opening 21c have different circumferential phases in a plan view. Specifically, as shown in Figure 4(a), the path 21a is formed such that the lower opening 21c is displaced 90° clockwise in a plan view relative to the upper opening 21b, with respect to the center point P1. Thus, each path 21a according to this embodiment is formed in a sloping shape so that its lower end faces inward (towards the center point P1) and twists clockwise in a plan view.

[0031] The reinforcing fibers 4 contained in the fiber stock section 10 are dispersed in a generally radial pattern as they pass through the path 21a of the injection unit 21. A detailed explanation of the dispersal of the reinforcing fibers 4 will be given later.

[0032] The configuration of the spraying device 1 has been described above. In addition to the configuration described above, various other configurations can be added to the spraying device 1. For example, a suitable supply mechanism (not shown) capable of supplying one reinforcing fiber 4 to each path 21a of the injector 21 may be provided in the spraying device 1.

[0033] Next, the method for placing the fiber-reinforced concrete 2 according to this embodiment will be explained using the flowchart shown in Figure 5. The method for placing the fiber-reinforced concrete 2 includes a concrete placement step (S10) and a reinforcing fiber scattering step (S20).

[0034] The concrete placement process (S10) is the process of placing concrete 3 (fresh concrete), which has been transported by an agitator truck, onto the target object. The concrete 3 is placed using an appropriate concrete pump truck. In this embodiment, the concrete 3 is placed on the formwork of the slab. During the concrete placement process, the surface of the concrete 3 after placement may also be leveled. With this, the concrete placement process is completed.

[0035] The reinforcing fiber scattering process (S20) is a process in which reinforcing fibers 4 are scattered on the surface of the concrete 3 before it hardens, after the concrete placement process has been completed. In the reinforcing fiber scattering process, the reinforcing fibers 4 are scattered using the scattering device 1. The details of the reinforcing fiber scattering process will be explained below using Figures 6 to 9. Note that Figures 6 and 7 schematically show the injector 21 and illustrate only one path 21a.

[0036] As shown in Figure 6, in the reinforcing fiber scattering process, the operator brings the injection unit 20 of the scattering device 1 close to the surface of the concrete 3. The fiber stock unit 10 of the scattering device 1 contains multiple reinforcing fibers 4 in advance. The reinforcing fibers 4 from the fiber stock unit 10 are supplied to each path 21a of the injector 21. At this time, the operator can supply one reinforcing fiber 4 to each path 21a, for example, using an appropriate supply mechanism (not shown). The reinforcing fibers 4 supplied from the fiber stock unit 10 move downward through each path 21a, and their lower ends make contact with the surface of the concrete 3. In this state, each reinforcing fiber 4 that is in contact with the surface of the concrete 3 is tilted along each path 21a of the injector 21, with its lower end facing inward (towards the center of the injector 21 in a plan view) and twisted clockwise in a plan view.

[0037] Next, the worker pulls the spraying device 1 upward so that each reinforcing fiber 4 is in contact with the surface of the concrete 3 and the entirety of each reinforcing fiber 4 is discharged (injected) from each path 21a. As a result, each reinforcing fiber 4 tilts toward the concrete 3 in a tilted position that twists clockwise in a plan view. As described above, by spraying the reinforcing fibers 4 by pulling up the spraying device 1 which is close to the surface of the concrete 3, it is possible to prevent the reinforcing fibers 4 from being affected by the wind and falling in an unintended direction. In this way, the reinforcing fibers 4 can be sprayed onto the concrete 3 in the reinforcing fiber spraying process to form fiber-reinforced concrete 2.

[0038] Figure 8 shows multiple reinforcing fibers 4 scattered on concrete 3. Note that Figure 8 shows eight reinforcing fibers 4 scattered from a single injector 21. Hereafter, multiple reinforcing fibers 4 scattered from a single injector 21 will be referred to as the "reinforcing fiber group 5". Also in Figure 8, the point on the surface of concrete 3 in a plan view that coincides with the center point P1 of the injector 21 in the reinforcing fiber scattering process is shown as center point P2. Furthermore, in Figure 8, a reference circle S1, a hypothetical circle with center point P2 as its center, is shown by a dashed line.

[0039] Each reinforcing fiber 4 constituting the reinforcing fiber group 5 is arranged roughly radially in a plan view. More specifically, each reinforcing fiber 4 is arranged such that its length is roughly oriented in the radial direction of the reference circle S1. In the example shown in Figure 8, the length of each reinforcing fiber 4 is slightly inclined (about 5°) with respect to the radial direction of the reference circle S1.

[0040] Furthermore, each reinforcing fiber 4 is arranged such that the circumferential phase difference between adjacent reinforcing fibers 4 in the circumferential direction of the reference circle S1 is approximately equal. Here, from the viewpoint of suppressing cracking of the fiber-reinforced concrete 2, it is desirable that the circumferential phase difference between adjacent reinforcing fibers 4 be within approximately 60°. The injector 21 according to this embodiment is formed to be able to scatter each reinforcing fiber 4 such that the angle θ indicating the circumferential phase difference between adjacent reinforcing fibers 4 is approximately 45°.

[0041] Figure 9 shows the reinforcing fibers 4 sprayed from multiple injectors 21 of the spraying device 1 in an area indicated by a dashed line (for example, an area of ​​100 mm square). By spraying using the spraying device 1, multiple groups of reinforcing fibers 5 can be formed at once. The worker performs the spraying using the spraying device 1 so that the reinforcing fibers 4 are distributed over approximately the entire surface of the concrete 3.

[0042] The reinforcing fiber scattering process is now complete. After the reinforcing fiber scattering process, the surface of the fiber-reinforced concrete 2 may be smoothed using dampers or a trowel or similar tool.

[0043] By performing each of the above steps, the pouring of the fiber-reinforced concrete 2 is completed. According to this embodiment, by controlling the direction of the reinforcing fibers 4 in the fiber-reinforced concrete 2, it is possible to suppress the bias of the orientation of multiple reinforcing fibers 4 in a particular direction.

[0044] In other words, according to the reinforcing fiber scattering process of this embodiment, the reinforcing fibers 4 can be arranged in the intended direction by injection using the injection device 21. As a result, as shown in Figure 8, each reinforcing fiber 4 of the reinforcing fiber group 5 can be arranged in a roughly radial and balanced manner. With the above configuration, bias in the orientation of the reinforcing fibers 4 can be suppressed.

[0045] Furthermore, according to this embodiment, each reinforcing fiber 4 can be arranged such that the circumferential phase difference between adjacent reinforcing fibers 4 in the reinforcing fiber group 5 is approximately 45°. This effectively suppresses cracking in the fiber-reinforced concrete 2.

[0046] Furthermore, according to this embodiment, the reinforcing fibers 4 can be scattered in such a way that the quantity of reinforcing fibers 4 per unit area of ​​the fiber-reinforced concrete 2 is approximately uniform (so that the reinforcing fibers 4 are distributed without bias) (see Figure 9).

[0047] According to the reinforcing fiber scattering process of this embodiment, as described above, each reinforcing fiber 4 can be arranged in a balanced manner, and the number of reinforcing fibers 4 per unit area can be made approximately uniform. Therefore, the amount of excess reinforcing fibers 4 that need to be supplied can be reduced, taking into account any bias in the orientation of the reinforcing fibers 4. This makes it possible to suppress the generation of fiber balls caused by the oversupply of reinforcing fibers 4.

[0048] As described above, the reinforcing fiber scattering method according to one embodiment of the present invention is A method for scattering reinforcing fibers, in which long reinforcing fibers 4, which are the material for fiber-reinforced concrete 2, are scattered from above toward the surface layer of concrete 3, The method includes a reinforcing fiber scattering step S20 (scattering step) in which a plurality of reinforcing fibers 4 are scattered on the surface of the concrete 3 at an inclination with respect to the vertical direction so that each of the reinforcing fibers 4 is positioned facing a set direction set for each reinforcing fiber 4.

[0049] This configuration makes it possible to avoid an excessive supply of reinforcing fibers 4 to the fiber-reinforced concrete 2. In other words, according to the reinforcing fiber scattering process S20, the reinforcing fibers 4 can be scattered so that each reinforcing fiber 4 is positioned facing the set direction, thus preventing an imbalance in the orientation of the reinforcing fibers 4. As a result, the amount of extra reinforcing fibers 4 supplied can be reduced by taking into account the imbalance in the orientation of the reinforcing fibers 4, thereby avoiding an excessive supply of reinforcing fibers 4.

[0050] Furthermore, the setting direction is, The longitudinal direction of the scattered plurality of reinforcing fibers 4 is oriented in the radial direction of the reference circle S1, which serves as a reference in a plan view, and the circumferential phase difference between adjacent reinforcing fibers 4 in the circumferential direction of the reference circle S1 is set to be within a predetermined range.

[0051] This configuration allows multiple reinforcing fibers 4 to be arranged in a roughly radial and balanced manner.

[0052] Furthermore, the circumferential phase difference between adjacent reinforcing fibers 4 in the circumferential direction of the reference circle S1 is within 60°.

[0053] This configuration effectively suppresses cracking in the fiber-reinforced concrete 2.

[0054] Furthermore, in the reinforcing fiber scattering step S20, The method involves scattering multiple reinforcing fibers 4 such that multiple groups of reinforcing fibers 5 are formed, which are multiple reinforcing fibers arranged in the setting direction based on one reference circle S1.

[0055] With this configuration, the reinforcing fibers 4 can be scattered in a way that ensures they are evenly distributed throughout the fiber-reinforced concrete 2.

[0056] Furthermore, the method for pouring fiber-reinforced concrete according to one embodiment of the present invention is: A method for pouring fiber-reinforced concrete, comprising the reinforcing fiber scattering method of the present invention, The concrete pouring process S10 includes pouring the concrete 3 onto the target area, In the reinforcing fiber scattering step S20, In the concrete placement process S10, a plurality of reinforcing fibers 4 are scattered on the surface of the concrete 3 that has been placed.

[0057] This configuration makes it possible to avoid an excessive supply of reinforcing fibers 4 to the fiber-reinforced concrete 2.

[0058] Furthermore, the injection device 21 according to one embodiment of the present invention is An injector 21 for spraying long reinforcing fibers 4, which are the material for fiber-reinforced concrete 2, onto the surface layer of concrete 3 from above, The concrete 3 has multiple paths 21a formed to allow injection of multiple reinforcing fibers 4, which are inclined with respect to the vertical direction, so that multiple reinforcing fibers 4 are arranged on the surface of the concrete 3 facing a set direction set for each reinforcing fiber 4.

[0059] This configuration makes it possible to avoid oversupplying of reinforcing fibers 4 to the fiber-reinforced concrete 2. Specifically, by using the injector 21, the reinforcing fibers 4 can be scattered so that each reinforcing fiber 4 is positioned facing the set direction, thus preventing uneven orientation of the reinforcing fibers 4. This makes it possible to reduce the amount of extra reinforcing fibers 4 supplied, taking into account any uneven orientation, and thus avoid oversupply of reinforcing fibers 4.

[0060] Furthermore, the multiple paths 21a are, The lower end is formed to face the center point P1 (center side in plan view) of the injection unit 21, and is also inclined to twist in the circumferential direction in plan view.

[0061] With this configuration, the reinforcing fibers 4 can be injected in a way that distributes them roughly radially and in a balanced manner.

[0062] Furthermore, the spraying device 1 according to one embodiment of the present invention is An injection unit 20 is provided with the injection device 21 of the present invention, A fiber stock section 10 (fiber storage section) capable of accommodating a plurality of reinforcing fibers 4 supplied to the path 21a of the injection unit 21, It is equipped with these features.

[0063] With this configuration, the reinforcing fibers 4 from the fiber stock section 10 can be supplied to the path 21a of the injection unit 21, thereby enabling efficient distribution of the reinforcing fibers 4. Furthermore, by using the injection unit 21 for distribution, it is possible to avoid excessive supply of reinforcing fibers 4 to the fiber-reinforced concrete 2.

[0064] Furthermore, the reinforcing fiber scattering step S20 according to this embodiment is one form of the scattering step according to the present invention. Furthermore, the fiber stock section 10 according to this embodiment is one form of the fiber storage section according to the present invention.

[0065] Although embodiments of the present invention have been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention as described in the claims. Furthermore, the specific numerical values ​​exemplified in the above description are examples and can be changed at will.

[0066] For example, the size of the spraying device 1 according to this embodiment, the number and arrangement of the injectors 21, etc., are not limited to the examples described above and can be appropriately changed based on factors such as crack prevention and the amount of reinforcing fibers 4 sprayed per unit area.

[0067] Furthermore, the shape and size of the injector 21 are not limited to the example described above and can be changed as appropriate. Specifically, in the example described above, the vertical dimension of the injector 21 was set to approximately the length of the reinforcing fiber 4, but the invention is not limited to this configuration, and the vertical dimension of the injector 21 may be made smaller or larger than the length of the reinforcing fiber 4.

[0068] Furthermore, the inner diameter and number (eight in this embodiment) of each path 21a of the injector 21 are not limited to the example described above and can be set as appropriate. For example, if the circumferential phase difference between adjacent reinforcing fibers 4 in the reinforcing fiber group 5 is set to within 60°, then at least six reinforcing fibers 4 must be arranged at equal intervals in the circumferential direction. From this viewpoint, the number of paths 21a of the injector 21 may be set to six, in order to distribute the minimum amount of reinforcing fibers 4. It is also possible to set the number of paths 21a to less than six. In addition, although this embodiment shows an example in which each path 21a of the injector 21 is arranged at equal intervals in the circumferential direction, the arrangement of each path 21a is not limited to the example described above and can be changed as appropriate.

[0069] Furthermore, although this embodiment shows an example in which the injection device 21 is provided with a hole-like path 21a that penetrates vertically, it is not limited to the above example. For example, it is also possible to form the injection device 21 by arranging a cylindrical member on the radially outer side of a cylindrical member, and to form a spiral groove corresponding to the path 21a in the space between each member.

[0070] Furthermore, although this embodiment describes an example in which fiber-reinforced concrete 2 is used to form a building slab, the embodiment is not limited to this. The fiber-reinforced concrete 2 according to this embodiment can be used in various structures. [Explanation of symbols]

[0071] 1 Spraying device 10 Fiber Stock Section 20 Injection part 21 Injector

Claims

1. A method for scattering reinforcing fibers, which are long-shaped reinforcing fibers that will be used as material for fiber-reinforced concrete, by scattering them from above toward the surface layer of the concrete, The process includes a scattering step of scattering the multiple reinforcing fibers at an inclination with respect to the vertical direction so that the multiple reinforcing fibers are arranged on the surface of the concrete facing a set direction set for each reinforcing fiber, Method for distributing reinforcing fibers.

2. The aforementioned setting direction is, The longitudinal direction of the scattered plurality of reinforcing fibers is oriented toward the radial direction of a reference circle in a plan view, and the circumferential phase difference between adjacent reinforcing fibers in the circumferential direction of the reference circle is set to be within a predetermined range. The method for scattering reinforcing fibers according to claim 1.

3. The circumferential phase difference between adjacent reinforcing fibers in the circumferential direction of the reference circle is within 60°. The method for scattering reinforcing fibers according to claim 2.

4. In the aforementioned spraying process, Multiple reinforcing fibers are scattered such that multiple groups of reinforcing fibers are formed, which are multiple reinforcing fibers arranged in the setting direction based on one reference circle. The method for scattering reinforcing fibers according to claim 2.

5. A method for pouring fiber-reinforced concrete, comprising the reinforcing fiber scattering method described in any one of claims 1 to 4, The process includes a concrete pouring step in which the concrete is poured onto the target area. In the aforementioned spraying process, Multiple reinforcing fibers are scattered on the surface layer of the concrete poured in the concrete pouring process. Method for pouring fiber-reinforced concrete.

6. An injection device for spraying long reinforcing fibers, which are the material for fiber-reinforced concrete, onto the surface of concrete from above, The concrete surface has multiple paths formed to allow injection of multiple reinforcing fibers, which are inclined with respect to the vertical direction, such that multiple reinforcing fibers are arranged in the surface layer of the concrete facing a set direction set for each reinforcing fiber. Injector.

7. The multiple aforementioned paths are The lower end is formed to be inclined toward the center of the injection device in a plan view, and to be twisted in the circumferential direction in a plan view. The injection device according to claim 6.

8. An injection unit provided with the injection device described in claim 6 or claim 7, A fiber housing section capable of accommodating a plurality of reinforcing fibers supplied to the path of the injection device, A spraying device equipped with [a specific feature].

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