Fiber scattering device and fiber scattering method

Abstract

This invention provides a technology that enables the uniform and efficient distribution of reinforcing fibers on the surface of concrete. [Solution] The fiber scattering device 10 for scattering fibers on the surface of concrete before it hardens has a configuration comprising a storage section for containing fibers, a discharge section for discharging fibers from the tip, and a flow path section through which fibers flow from the storage section towards the discharge section.

Description

Technical Field

[0001] The present invention relates to a fiber spraying device and a fiber spraying method, and particularly to a technique that enables reinforcing fibers to be uniformly and efficiently sprayed on the surface of concrete.

Background Art

[0002] There is a method of enhancing the toughness of concrete and preventing peeling and spalling by kneading reinforcing fibers into the concrete. For such kneading of reinforcing fibers, a method of putting the reinforcing fibers into the drum of an agitator truck and kneading them (hereinafter, kneading type) or a method of spraying the reinforcing fibers on the surface of the concrete before curing (hereinafter, spraying type) is adopted. In any method, it is important that the reinforcing fibers are uniformly mixed (including the concept of spraying) into the concrete.

[0003] Therefore, various techniques related to kneading reinforcing fibers into concrete have been proposed. As such a technique, for example, a technique related to a fiber material spraying device and a method for manufacturing a concrete structure that can efficiently manufacture a concrete structure in which a fiber material is embedded in the surface layer portion by uniformly spraying the fiber material on the surface layer portion of the freshly placed and uncured concrete (see Patent Document 1) has been proposed.

[0004] This technique relates to a fiber material spraying device that sprays a fiber material on the surface layer portion of freshly placed and uncured concrete, and includes a main body portion having a storage portion for storing the fiber material and a discharge port for discharging the fiber material stored in the storage portion, wheels connected to the main body portion and rolling on the surface layer portion, and a spraying amount adjusting mechanism for adjusting the spraying amount of the fiber material discharged from the discharge port to a desired amount in conjunction with the rotation of the wheels.

[0005] In addition, a technique related to a method in which a corrosion-resistant synthetic resin is permanently fixed and is no longer pushed off by the pressure generated after the synthetic resin coating (see Patent Document 2) has also been proposed.

[0006] This technology relates to a method for attaching a corrosion-resistant synthetic resin coating, made of a curable synthetic resin, to the surface of a concrete structure, such as the inner surface of a wastewater collector, by cleaning the surface and bonding a corrosion-resistant synthetic resin to the cleaned surface. The method is characterized by first attaching a fiber-scattered concrete layer to the cleaned surface, the fiber-scattered concrete layer having fibrous portions protruding from the surface of the scattered concrete, and then attaching a corrosion-resistant synthetic resin coating on the surface of the scattered concrete, and when attaching the synthetic resin coating, the fibrous portions being locked into the synthetic resin coating.

[0007] Furthermore, even when the target is the placement surface of room-temperature curing ultra-high-strength fiber-reinforced concrete, a method for achieving good surface roughening at low cost and technology related to the cement hardened body obtained thereby have also been proposed (see Patent Document 3).

[0008] This technology relates to a method for roughening the surface of room-temperature curing ultra-high-strength fiber-reinforced concrete, comprising the steps of: spraying a liquid retarder at a rate of 300 to 1000 g per 1 m2 of the surface of the fiber-reinforced concrete; covering the surface on which the retarder has been sprayed with a sheet to prevent drying; curing the fiber-reinforced concrete while it is covered with the sheet to prevent drying; peeling the sheet to prevent drying from the surface of the concrete; and, after curing, when the compressive strength of the fiber-reinforced concrete has reached a value in the range of 40 to 110 N / mm2, spraying water onto the surface to roughen the surface of the concrete. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2023-068302 [Patent Document 2] Special Publication No. 6-055476 [Patent Document 3] Japanese Patent Publication No. 2015-175160 [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] Of the conventional methods described above, the mixing method requires cleaning to remove reinforcing fibers from the drum after use. Therefore, a considerable workload is incurred after each use. This often leads to reluctance to adopt the mixing method. Given this situation, adopting the spraying method, which does not require extensive cleaning, is considered rational. However, in the spraying method, manual application of reinforcing fibers, relying on the worker's intuition, is often employed. Therefore, there are challenges in work efficiency and accuracy. In other words, a uniform and efficient method for spraying reinforcing fibers has not yet been established.

[0011] Therefore, the present invention has been made in view of the above problems, and its objective is to provide a technology that enables the uniform and efficient dispersal of reinforcing fibers on the surface of concrete. [Means for solving the problem]

[0012] The above problems are solved by the fiber scattering device of the present invention, which scatters fibers on the surface of concrete before it hardens, and has a configuration comprising a storage section for containing the fibers, a discharge section for discharging the fibers from the tip, and a flow path section through which the fibers flow from the storage section toward the discharge section.

[0013] In the fiber scattering device of the present invention configured as described above, a predetermined amount of fibers flows through the flow channel into the discharge section, and is discharged from an opening at the tip of the discharge section within a certain range and direction, scattering onto the concrete surface. Therefore, reinforcing fibers can be scattered more uniformly and efficiently on the concrete surface.

[0014] Furthermore, in the fiber dispersing device described above, it is preferable that the containment section has an inclined structure that is inclined horizontally within its interior space, and that the lower part of the inclined structure has an outlet for discharging the fibers from the interior space, and that the outlet is continuous with the flow path section.

[0015] According to the above configuration, the fibers stored in the containment section naturally flow down along the inclined structure and can move from the discharge port towards the flow channel. As a result, the fibers move naturally with appropriate force from the flow channel towards the discharge channel and are efficiently discharged. Consequently, reinforcing fibers can be scattered more uniformly and efficiently on the concrete surface.

[0016] Furthermore, in the fiber spreading device described above, it is preferable that the tip of the discharge section includes a plate with one or more holes and a guide member that protrudes from the surface of the plate and separates the holes from the surface of the concrete.

[0017] With the above configuration, unlike the case where the discharge hole and the concrete surface come into contact, the fibers attempting to fall from the hole are not immediately stopped at the boundary between the hole and the concrete surface, but are instead easily discharged through the gap created by the separation. Furthermore, the contact marks on the concrete surface, indicating the positions where the guide member made contact, visually indicate the spraying area for each contact opportunity during the spraying process, thus preventing overlapping spraying areas. Ultimately, this allows for more uniform and efficient spraying of reinforcing fibers on the concrete surface.

[0018] Furthermore, in the above-described fiber scattering device, it is preferable that the discharge section is a box-shaped body, and that partition plates are arranged inside the box-shaped body to divide the inside of the box-shaped body.

[0019] According to the above configuration, for example, when the fibers flowing in from the flow path section temporarily stay in the discharge section and are discharged from the holes, the fibers are likely to be naturally dispersed and arranged in each region partitioned by the partition plate. As a result, the reinforcing fibers can be more uniformly and efficiently sprayed on the concrete surface.

[0020] In addition, in the above fiber spraying device, it is preferable that ribs for guiding the fibers to the holes are provided near the holes of the plate.

[0021] According to the above configuration, when the fibers in the inner cavity of the discharge section are discharged from the holes, the ribs naturally guide the fibers toward the holes, making it easier for the fibers to smoothly fall from the holes. This leads to an event where the fibers are easily and efficiently discharged from the holes. As a result, the reinforcing fibers can be more uniformly and efficiently sprayed on the concrete surface.

[0022] In addition, in the above fiber spraying device, it is preferable that a regulating structure for regulating the direction of the fibers when they are discharged from the discharge section is provided.

[0023] According to the above configuration, when the fibers in the inner cavity of the discharge section are discharged from the holes, the direction and angle of the fibers are likely to be aligned with the desired ones along the regulating structure. This leads to an event where the fibers are easily discharged in an efficient and desired form. As a result, the reinforcing fibers can be more uniformly and efficiently sprayed on the concrete surface.

[0024] In addition, in the above fiber spraying device, a shut-off valve for blocking the inner cavity and a sensor for detecting the amount of the fibers in the inner cavity are arranged in the flow path section, and it is preferable that a control controller for controlling the shut-off valve to adjust the amount of the fibers is provided.

[0025] According to the above configuration, it becomes easier to maintain the amount of the fibers discharged from the discharge section in a stable and suitable state. As a result, the reinforcing fibers can be more uniformly and efficiently sprayed on the concrete surface.

[0026] Further, in the above-described fiber spraying device, it is preferable to have a movable body that suppresses clogging of the fibers in the inner space by moving in the inner space of the flow path portion.

[0027] According to the above configuration, the movement of the fibers in the flow path portion can be smoothed, and the discharge from the discharge portion can also be made efficient. As a result, the reinforcing fibers can be sprayed more uniformly and efficiently on the concrete surface.

[0028] Further, in the above-described fiber spraying device, it is preferable to include a vibration applying mechanism that applies vibration to at least one of the housing portion, the discharge portion, or the flow path portion forming member.

[0029] According to the above configuration, it is possible to suppress the stagnation of the flow of fibers from the housing portion through the flow path portion to the discharge portion, and more efficient discharge of the fibers becomes possible. As a result, the reinforcing fibers can be sprayed more uniformly and efficiently on the concrete surface.

[0030] Further, the above problems are solved by the fiber spraying method of the present invention. In order to spray fibers on the surface of concrete before curing, a fiber spraying method using a fiber spraying device having a housing portion for housing the fibers, a discharge portion for discharging the fibers from the tip, and a flow path portion through which the fibers flow from the housing portion toward the discharge portion. The method includes a step of holding the housing portion at a position higher than the discharge portion while bringing the tip of the discharge portion into contact with the surface of the concrete, and a step of discharging the fibers flowing from the housing portion through the flow path portion to the discharge portion from the tip of the discharge portion onto the surface of the concrete.

[0031] According to the above fiber spraying method, the reinforcing fibers can be sprayed uniformly and efficiently on the concrete surface.

Effects of the Invention

[0032] According to the fiber scattering device and fiber scattering method of the present invention, reinforcing fibers can be scattered uniformly and efficiently on the concrete surface. [Brief explanation of the drawing]

[0033] [Figure 1] This figure shows an example of a fiber scattering device in this embodiment. [Figure 2] This figure shows an example of the tank configuration in the fiber spreading device of this embodiment. [Figure 3] This is a side view of the fiber scattering device in this embodiment. [Figure 4] This figure shows an example of how the fiber scattering device of this embodiment is used. [Figure 5] This figure shows an example of the internal structure of the hose in this embodiment. [Figure 6] This figure shows an example of the arrangement of the movable body inside the hose according to this embodiment. [Figure 7] This figure shows another example of operation of the fiber scattering device of this embodiment. [Figure 8] This figure shows an example of a nozzle in the fiber scattering device of this embodiment. [Figure 9A] This figure shows an example of the internal structure of the nozzle in the fiber dispersing device of this embodiment. [Figure 9B] This figure shows an example of the rib structure of the nozzle in the fiber dispersing device of this embodiment. [Figure 10A] This figure shows an example of the internal structure of the nozzle in the fiber dispersing device of this embodiment. [Figure 10B] This figure shows an example of the rib structure of the nozzle in the fiber dispersing device of this embodiment. [Figure 11A] This figure shows an example of a nozzle socket structure in this embodiment. [Figure 11B] This figure shows an example of a nozzle socket structure in this embodiment. [Figure 12] This diagram shows the flow of the fiber scattering method in this embodiment. [Modes for carrying out the invention]

[0034] <<Regarding a fiber scattering device according to one embodiment of the present invention>> The following describes the various devices constituting the fiber scattering apparatus in the present invention and the methods performed therein, using one embodiment of the present invention (hereinafter referred to as "this embodiment") as an example, with reference to the attached drawings. However, the embodiment described below is merely an example given to facilitate understanding of the present invention and does not limit the present invention. That is, the present invention can be modified or improved from the embodiment described below without departing from its spirit. Naturally, the present invention also includes equivalents thereof.

[0035] Furthermore, in this specification, "device" includes not only a single device that performs a predetermined function on its own, but also multiple devices that are separate from each other but cooperate to perform a predetermined function.

[0036] <Configuration of the fiber dispersing device> First, the configuration of the fiber spreading device of this embodiment will be shown. Figure 1 is a diagram showing an example of the configuration of the fiber spreading device 10 in this embodiment. Figure 2 is a diagram showing an example of the configuration of the tank 11 of the fiber spreading device 10 in this embodiment, and Figure 3 is a side view of the fiber spreading device 10 in this embodiment. The fiber spreading device 10 of this embodiment consists of a tank 11 which is the storage section, a nozzle 12 which is the discharge section, and a hose 13 which is the flow path section.

[0037] Tank 11 has an inclined structure 112 in its interior (hereinafter referred to as tank interior 111) which contains an appropriate amount of fibers (reinforcement fibers) for dispersion. The inclined structure 112 is a structure provided at the bottom 1111 of the tank interior 111 and has a mortar-like structure that slopes down from the lower end 1112 of the side wall of the tank interior 111 towards the center of the bottom of the tank interior 111. An outlet 113 is connected to the end of this inclined structure 112, that is, the lower end 1121 of the mortar-like structure at the bottom 1111 of the tank interior 111, via an outlet pipe 114.

[0038] The fibers contained in the tank cavity 111, due to their own weight, fall toward the bottom 1111 of the tank cavity 111, converging along the inclined structure 112 toward the discharge pipe 114, and then being discharged from the outlet 113. The position and shape of the inclined structure 112 are not limited to the forms shown in Figures 2 and 3. For example, a mortar-shaped structure that slopes down from the upper end 1113 of the side wall of the tank cavity 111 toward the center of the bottom surface of the tank cavity 111 can also be adopted.

[0039] Furthermore, it is preferable that the tank 11 be equipped with a shoulder strap 115 on one of its outer surfaces. As illustrated in Figure 4, this shoulder strap 115 is used by the worker 5 who spreads the fibers 3 when carrying the tank 11 of the fiber spreading device 10 on their back, but its inclusion or exclusion may be decided as appropriate depending on the usage of the fiber spreading device 10. It is also preferable that the tank 11 be placed and fixed on top of the frame 116. In this case, the outlet pipe 114 and the discharge port 113 are appropriately held within the frame 116, making it easier to avoid situations where they are deformed or damaged by direct stress from the outside. Therefore, when the tank 11 is temporarily placed on the surface 2 of the concrete 1 at the work site (hereinafter referred to as concrete surface 2), workers can perform their work without having to worry particularly about the handling of the outlet pipe 114 and the discharge port 113.

[0040] The discharge port 113 of the tank 11 is connected to the hose 13 via an appropriate fitting. The hose 13 connects the tank 11 and the nozzle 12 at an appropriate length and has appropriate flexibility to be easily handled by the worker 5. However, it also has appropriate rigidity to maintain the cross-section of its interior (hereinafter referred to as the hose interior 131). Figure 5 shows an example of the configuration of the hose interior 131 in this embodiment.

[0041] In this embodiment, the hose 13 is equipped with a shut-off valve 132, a sensor 133, and a control controller 134 within its internal cavity 131, as shown in Figure 5. The shut-off valve 132 is a plate-like body with a shape and size that can seal the cross-section of the internal cavity 131 of the hose. This shut-off valve 132 is capable of rotational movement within the internal cavity 131 of the hose, around a rotation axis 1321 that traverses the internal cavity 131 of the hose.

[0042] Furthermore, such rotational movements are performed, for example, by a control controller 134 built into the shaft of the rotating shaft 1321. The control controller 134 controls a motor (provided by the control controller 134) that rotates the rotating shaft 1321, and performs the rotational movement of the shut-off valve 132 around the rotating shaft 1321. In the example shown in Figure 5, both the open and closed states of the shut-off valve 132 are shown.

[0043] Furthermore, the hose cavity 131 is equipped with a sensor 133 that observes the flow rate of the fibers 3 moving through the hose cavity 131. Therefore, the control controller 134 can control the opening degree of the shut-off valve 132 in the hose cavity 131 according to the magnitude of the fiber flow rate observed by the sensor 133. For example, if the fiber flow rate observed in the hose cavity 131 exceeds a standard, the control controller 134 reduces the opening degree of the shut-off valve 132 to prevent an excessive amount of fibers 3 from flowing. Alternatively, if the fiber flow rate observed in the hose cavity 131 does not meet the standard, the control controller 134 increases the opening degree of the shut-off valve 132 to allow a predetermined required amount of fibers 3 to flow.

[0044] Furthermore, a movable body 135 is positioned inside the hose cavity 131, as shown in Figure 6. This movable body 135, for example, suppresses clogging of fibers 3 that accumulate inside the hose cavity 131 by performing predetermined movements. The movement of the movable body 135 is achieved, for example, by an operator moving an operating jig that communicates with the outer casing of the hose 13. Alternatively, it may be biased for rotation, etc., by a control mechanism similar to that of the control controller 134. With this movable body 135, the movement of fibers 3 inside the hose cavity 131 is made smoother, and discharge from the nozzle 12 tends to be more efficient.

[0045] Furthermore, the fiber spreading device 10 in this embodiment is equipped with a vibrator 14 that applies vibration to at least one of the tank 11, nozzle 12, and hose 13. The example shown in Figure 4 shows a configuration in which the vibrator 14 is installed on the nozzle 12. By adopting such a configuration with a vibrator 14, it is possible to suppress stagnation in the flow of fibers 3 from the tank 11 through the hose 13 to the nozzle 12, and to discharge the fibers 3 more efficiently.

[0046] As another example of the implementation configuration of the fiber spreading device 10, as shown in Figure 7, a configuration in which the shoulder belt 115 is not provided on the tank 11 and a caster base 117 is used can also be adopted. In this case, the tank 11 is not carried on the back of the worker 5, but is placed on the top plate 118 of the caster base 117. This top plate 118 is supported so as to be movable by caster legs 119 installed at the four corners of the top plate 118. The worker 5 can easily move the caster base 117 on the concrete surface 2 while holding the nozzle 12 and performing the operation of spreading the fibers 3.

[0047] Furthermore, as shown in Figures 8 and 9A, the nozzle 12 in the fiber spreading device 10 of this embodiment is equipped with a plate 124 and a guide member 125 at its tip (hereinafter, nozzle tip 121). The plate 124 is positioned opposite to the flow of fibers 3 from the hose 13 and has numerous discharge holes 122 at regular intervals. The guide member 125 is a member that separates the plate 124 from the concrete surface 2. This guide member 125 appropriately suppresses the occurrence of situations where fibers 3 flowing down from the hose 13 and entering through the elbow joint 127 and socket 128 are immediately stopped at the boundary between the discharge holes 122 of the plate 124 and the concrete surface 2, causing them to accumulate. In addition, contact marks are left on the concrete surface 2 indicating the position where the guide member 125 has contacted, which leads to the visual indication of the spreading range at each contact opportunity during the spreading operation. This has the effect of suppressing overlap of the spreading range.

[0048] Furthermore, the nozzle 12 illustrated in Figure 8 is a box-shaped structure, and as shown in Figure 9A, partition plates 126 are arranged inside it to divide the inside of the nozzle. The presence of these partition plates 126 inside the nozzle makes it easier for the fibers 3 flowing in from the hose 13 to be distributed into the areas partitioned by the partition plates 126. This leads to a more even distribution of the fibers 3 to the discharge holes 122 (Figure 9A, etc.) which are distributed on the plate 124.

[0049] Furthermore, it is preferable that ribs 123 are provided near the discharge holes 122 in the plate 124 to guide the fibers 3 into the discharge holes 122. In the example shown in Figures 9A and 9B, eight slit-shaped discharge holes 122 are arranged radially (hereinafter referred to as radial slits 1221). Therefore, the ribs 123 are provided along each of the slit-shaped discharge holes 122 that make up the radial slits 1221. When this configuration is adopted, when the fibers 3 inside the nozzle 12 are discharged from the radial slits 1221, the fibers 3 are naturally guided toward the radial slits 1221 by the ribs 123, making it easier for them to fall smoothly from the radial slits 1221.

[0050] Furthermore, the form of the discharge holes 122 is not limited to the radial slits 1221 described above. For example, a grid-like slit 1222 may be used, as shown in Figures 10A and 10B. This grid-like slit 1222 is arranged by combining the discharge holes 122 vertically and horizontally. Therefore, the ribs 123 are also arranged in a vertical and horizontal combination, similar to the arrangement of the discharge holes 122.

[0051] Furthermore, in addition to the box-shaped form shown so far, a form in which the socket 128 itself serves as the tip 121 of the nozzle 12 (hereinafter referred to as the nozzle tip 121) can also be adopted as the nozzle 12. An example of such a form in which the socket 128 serves as the nozzle tip 121 is shown in Figures 11A and 11B. The socket 128 shown in Figure 11A has a bottom plate 1282 at the bottom of the socket cavity 1281, and a vertical hole-shaped slit 1223 is provided in this bottom plate 1282.

[0052] The vertical slits 1223 are distributed, for example, at equal intervals on the surface of the base plate 1282. Furthermore, the columnar hole structure extending from the upper opening 12231 to the lower opening 12232 of each vertical slit 1223 exists in an inclined manner within the thickness of the plate 124, oriented toward the center of the base plate 1282's surface. The fibers 3 flowing from the hose 13 into the socket cavity 1281 enter the columnar hole structure through the upper opening 12231 of the vertical slit 1223, and then protrude from the lower opening 12232, contacting the concrete surface 2. Subsequently, when the socket 128 is lifted from the concrete surface 2 by the worker 5, the fibers 3 collapse onto the concrete surface 2. Through this process, the fibers 3 fall from each of the vertical slits 1223, resulting in a radially dispersed scattering of the fibers 3 on the concrete surface 2. In other words, the vertical slit 1223 acts as a restricting structure that regulates the direction of the fibers 3 discharged from the socket 128, which is the nozzle 12.

[0053] Furthermore, a configuration in which a fan-shaped slit 1224 is used as the nozzle tip 121, which is a different socket 128 from the vertical hole-shaped slit 1223 described above, can also be adopted. An example of this fan-shaped slit 1224 is shown in Figure 11B. The socket 128 shown in Figure 11B has a structure in which a bottom plate 1282 is provided at the bottom of the socket cavity 1281, and the fan-shaped slit 1224 is provided on this bottom plate 1282.

[0054] The fan-shaped slits 1224 are distributed on the surface of the bottom plate 1282, for example, in a manner that extends over a range of equal angles. The fibers 3 that flow from the hose 13 into the socket cavity 1281 enter the openings 12241 of the fan-shaped slits 1224 and fall onto the concrete surface 2, where they lie flat. This movement of the fibers 3 causes them to fall from each of the fan-shaped slits 1224, resulting in the scattering of the fibers 3 on the concrete surface 2 in a fan-shaped distribution. In other words, the fan-shaped slits 1224 act as a restricting structure that regulates the direction of the fibers 3 discharged from the socket 128, which is the nozzle 12. With these vertical slits 1223 and fan-shaped slits 1224, the direction and angle of the fibers 3 during discharge can be more easily aligned to a desired shape, position, and direction along with the respective openings.

[0055] <Fiber scattering method> Next, the procedure for the fiber spreading method using the fiber spreading device 10 in this embodiment will be explained based on the flow chart in Figure 12. In this case, worker 5 puts a predetermined amount of fiber 3 into the tank 11's interior 111 to perform preliminary preparations before construction. Worker 5 then puts his arms through the shoulder straps 115 of the tank 11 and carries it on his back, assuming a posture for fiber spreading. At this point, worker 5 holds the nozzle 12 so that the relative position of the tank 11 is higher than the nozzle 12. In other words, the relative height adjustment process of the tank 11 is performed (S10). Performing this height adjustment ensures that the fiber 3 in the tank's interior 111 flows smoothly down to the nozzle 12 via the hose 13.

[0056] Next, worker 5 brings the nozzle 12 into contact with the concrete surface of the concrete 1 to be sprayed with fibers (S11). As a result, the fibers 3 attempt to flow from the tank cavity 111 through the hose cavity 131 of the hose 13 into the nozzle 12. Meanwhile, the control controller 134 observes the flow rate of the fibers 3 in the hose cavity 131 using the sensor 133 and adjusts the opening of the shut-off valve 132 according to the magnitude of the flow rate (S12). At this time, the control controller 134 also uses the sensor 133 to detect whether there is any blockage of fibers 3 in the hose cavity 131, and if a blockage is detected, it moves the movable body 135. Of course, detection and countermeasures for such fiber blockages can also be carried out not only in the hose cavity 131, but also in the tank cavity 111 and the cavity of the nozzle 12.

[0057] By adjusting the fiber flow rate and suppressing clogging as described above, the inflow of fibers 3 from the tank cavity 111 into the hose cavity 131 and the flow down from the hose cavity 131 into the nozzle cavity 12 continue without interruption. As a result, fibers 3 are discharged from the discharge hole 122 of the nozzle tip 121 (including radial slits 1221, grid-like slits 1222, vertical slits 1223, and fan-shaped slits 1224) and scattered onto the concrete surface 2 (S13). At this time, as already mentioned, the direction and angle of the fibers 3 are controlled to be in an appropriate state by the restrictive structure (for example, the vertical slits 1223 and fan-shaped slits 1224).

[0058] Although one embodiment of the fiber scattering apparatus and fiber scattering method of the present invention has been described above, the above embodiment is merely an example to facilitate understanding of the present invention and does not limit the present invention. In other words, the present invention can be modified and improved without departing from its spirit. Furthermore, it goes without saying that the present invention includes equivalents thereof. [Explanation of Symbols]

[0059] 1. Concrete 2. Concrete surface 3 Fibers 5 Workers 10 Fiber dispersal device 11 Tank (Storage section) 111 Tank empty 1111 Bottom (of the empty tank) 1112 Lower end (of the side wall inside the tank) 1113 Upper end (of the side wall inside the tank) 112 Inclined structure 1121 Lower end (of the inclined structure) 113 Outlet 114 Outlet pipe 115 Shoulder straps 116 frames 117 Caster base 118 Top plate 119 Caster legs 12 Nozzles (discharge section) 121 Nozzle tip 122 Discharge hole (regulation structure) 1221 Radial slits 1222 Grid-like slits 1223 Vertical hole-shaped slit 12231 Upper opening 12232 Lower opening 1224 Fan-shaped slit 123 Rib 124 boards 125 Guide member 126 partition boards 127 Elbow joint 128 sockets 1281 Socket empty 1282 Bottom plate 13. Hose (flow channel section) 131 Hose empty 132 Shut-off valve 1321 Rotation axis 133 Sensors 134 Control Controller 135 Movable body 14. Vibrator (Vibration-generating mechanism)

Claims

1. A fiber scattering device for scattering fibers onto the surface of concrete before it hardens, A housing section for housing the aforementioned fibers, A discharge section that discharges the aforementioned fibers from the tip, A flow path section through which the fibers flow from the receiving section toward the discharge section, A fiber scattering device having a fiber scattering device.

2. The housing section has an inclined structure that is inclined horizontally within its interior space, and the lower part of the inclined structure has an outlet for discharging the fibers from the interior space, and the outlet is continuous with the flow path section. The fiber scattering device according to feature 1.

3. The tip of the discharge section comprises a plate with one or more holes, and a guide member that protrudes from the surface of the plate to separate the holes from the surface of the concrete. The fiber scattering device according to feature 1 or 2.

4. The discharge section is a box-shaped structure, and partition plates are arranged inside the box-shaped structure to divide the interior of the box. The fiber scattering device according to feature 3.

5. Ribs are provided near the holes in the plate to guide the fibers into the holes. The fiber scattering device according to feature 3.

6. A restricting structure is provided to regulate the direction of the fibers when they are discharged from the discharge section. The fiber scattering device according to feature 1.

7. The flow path section includes a shut-off valve for blocking the internal space and a sensor for detecting the amount of fibers in the internal space, and a control controller that controls the shut-off valve to adjust the amount of fibers. The fiber scattering device according to feature 1.

8. The system has a movable body that moves within the flow path to suppress clogging of the fibers within the flow path. The fiber scattering device according to feature 1.

9. The system includes a vibration application mechanism for applying vibration to a member forming at least one of the housing section, the discharge section, or the flow path section. The fiber scattering device according to feature 1.

10. To scatter fibers on the surface of the concrete before it hardens, A method of dispersing fibers using a fiber dispersing device having a receiving section for containing the fibers, a discharge section for discharging the fibers from its tip, and a flow path section through which the fibers flow from the receiving section toward the discharge section, The process of holding the receiving section at a position higher than the discharge section, while bringing the tip of the discharge section into contact with the surface of the concrete, A step of discharging the fibers that flow down from the storage section through the flow path to the discharge section from the tip of the discharge section to the surface of the concrete, A fiber scattering method that performs this action.

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