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JP-7856953-B2 - Fiber material spreading device and method for manufacturing concrete structure

JP7856953B2JP 7856953 B2JP7856953 B2JP 7856953B2JP-7856953-B2

Inventors

  • 山田 雅裕
  • 室賀 陽一郎
  • 佐藤 政次

Assignees

  • 東亜建設工業株式会社
  • バルチップ株式会社
  • 株式会社テクノコア

Dates

Publication Date
20260512
Application Date
20211102

Claims (8)

  1. In a fiber material spreading device that scatters fiber material onto the surface layer of concrete before it has solidified after being placed, The apparatus comprises a main body having a storage section for containing the fiber material and a discharge port from which the fiber material stored in the storage section is discharged, a wheel connected to the main body and rolling on the surface, and a dispensing amount adjustment mechanism that adjusts the amount of the fiber material discharged from the discharge port to a desired amount in conjunction with the rotation of the wheel, A fiber material spreading device characterized in that the entire spreading amount adjustment mechanism is positioned above the discharge port and within the interior of the main body, the wheels are positioned outside the range through which the discharge port passes when viewed from above, and the main body and the spreading amount adjustment mechanism are separate components .
  2. In a fiber material spreading device that scatters fiber material onto the surface layer of concrete before it has solidified after being placed, The apparatus comprises a main body having a storage section with an internal space for containing the fiber material and a discharge port from which the fiber material contained in the storage section is discharged, a wheel connected to the main body and rolling on the surface, and a dispersal amount adjustment mechanism that adjusts the amount of the fiber material discharged from the discharge port to a desired amount in conjunction with the rotation of the wheel, The fiber material spreading device is characterized in that the spreading amount adjustment mechanism includes a fiber material loosening mechanism having a swinging part separate from the storage part, and the swinging part is arranged in the internal space of the storage part and swings back and forth relative to the inner wall of the storage part .
  3. The fiber material spreading device according to claim 2, wherein the spreading amount adjustment mechanism has an impeller, the impeller is positioned between the loosening mechanism and the discharge port, and rotates in conjunction with the rotation of the wheel to further loosen the fiber material that has been loosened by the loosening mechanism.
  4. The fiber material spreading device according to claim 2, wherein the spreading amount adjustment mechanism has an intermediate opening and a switching mechanism, the intermediate opening is provided between the loosening mechanism and the discharge port, and the switching mechanism switches between an open state and a closed state of the intermediate opening in conjunction with the rotation of the wheels.
  5. In a fiber material spreading device that scatters fiber material onto the surface layer of concrete before it has solidified after being placed, The apparatus comprises a main body having a storage section for containing the fiber material and a discharge port from which the fiber material stored in the storage section is discharged, a wheel connected to the main body and rolling on the surface, and a dispensing amount adjustment mechanism that adjusts the amount of the fiber material discharged from the discharge port to a desired amount in conjunction with the rotation of the wheel, The fiber material spreading device is characterized in that the spreading amount adjustment mechanism comprises an intermediate opening provided between the upper and lower parts of the storage section and the discharge port, a switching mechanism that switches between an open state and a closed state of the intermediate opening in conjunction with the rotation of the wheels, and an impeller that rotates in conjunction with the rotation of the wheels to loosen the fiber material that has passed through the intermediate opening, and the entire impeller is positioned between the upper and lower parts of the intermediate opening and the discharge port .
  6. In a fiber material spreading device that scatters fiber material onto the surface layer of concrete before it has solidified after being placed, The apparatus comprises a main body having a storage section for containing the fiber material and a discharge port from which the fiber material stored in the storage section is discharged, a wheel connected to the main body and rolling on the surface, and a dispensing amount adjustment mechanism that adjusts the amount of the fiber material discharged from the discharge port to a desired amount in conjunction with the rotation of the wheel, A fiber material spreading device having a pressing mechanism for pressing the fiber material discharged from the discharge port toward the surface layer, characterized in that when the fiber material is spread, the pressing mechanism is positioned behind the discharge port in a top view and within the range through which the discharge port passes.
  7. In a fiber material spreading device that scatters fiber material onto the surface layer of concrete before it has solidified after being placed, The apparatus comprises a main body having a storage section for containing the fiber material and a discharge port from which the fiber material contained in the storage section is discharged, a wheel connected to the main body and rolling on the surface, a dispensing amount adjustment mechanism that adjusts the amount of the fiber material discharged from the discharge port to a desired amount in conjunction with the rotation of the wheel, and a handle. A fiber material spreading device characterized in that the wheels are positioned at the rear of the main body, the front end of the discharge port is positioned in front of the front end of the wheels, and the position of the handle can be changed between a state in which it extends behind the front end of the discharge port and a state in which it extends in front of the front end of the discharge port.
  8. A method for manufacturing a concrete structure in which the fibrous material is embedded in the surface layer using a fibrous material scattering device according to any one of claims 1 to 7, A method for manufacturing a concrete structure, characterized by moving the fiber material spreading device over the surface layer of the poured, unhardened concrete, causing the wheels to roll over the surface layer, and spreading the fiber material on the surface layer while adjusting the amount of fiber material discharged from the discharge port to a desired amount using the spreading amount adjustment mechanism.

Description

This invention relates to a fiber material spreading device and a method for manufacturing a concrete structure, and more specifically, to a fiber material spreading device and a method for manufacturing a concrete structure that can efficiently produce a concrete structure in which fiber material is embedded in the surface layer by uniformly spreading fiber material on the surface layer of concrete before it has solidified after being placed. A construction method is known that enhances the tensile durability of concrete structures by embedding numerous fine fibrous materials (short fibers) into the concrete (see, for example, Patent Document 1). Conventionally, fibrous materials are placed in the drum of an agitator truck transporting ready-mix concrete (hereinafter referred to as "ready-mix concrete"), and the drum is rotated at high speed to mix the concrete and fibrous materials. Then, the ready-mix concrete mixed with the fibrous materials is poured and allowed to solidify, thereby producing a concrete structure in which the fibrous materials are embedded throughout. However, this manufacturing method is uneconomical because the fibrous material remains embedded in unnecessary areas of the concrete structure. Furthermore, after concrete placement, the fibrous material adheres to the agitator truck's drum, requiring considerable effort to clean the drum and generating a large amount of treated water. Disposing of the remaining concrete mixed with the fibrous material also presents significant challenges in terms of time and cost. Japanese Patent Publication No. 2017-178755 This is an explanatory diagram illustrating, in a side view, the situation in which a fibrous material is scattered on the surface layer of concrete using a fibrous material scattering device according to an embodiment of the present invention.Figure 1 is an explanatory diagram illustrating the internal structure of the fiber material dispensing device in a longitudinal cross-sectional view.This is a view from arrow A in Figure 2.This is a cross-sectional view taken along the line B-B in Figure 2.Figure 2 is an explanatory diagram illustrating the internal structure of the fiber material dispersing device in a longitudinal cross-sectional view after it has moved a predetermined distance.This is an explanatory diagram illustrating, in a side view, a situation in which a fibrous material scattering device according to another embodiment of the present invention is being towed and fibrous material is being scattered onto the surface layer of concrete.Figure 6 is an explanatory diagram illustrating, from a side view, the situation in which the fiber material spreading device is pushed to spread the fiber material onto the surface layer of concrete.This is an explanatory diagram illustrating, in a side view, a situation in which a fibrous material is being scattered on the surface layer of concrete using a fibrous material scattering device according to yet another embodiment of the present invention.This is an explanatory diagram illustrating, in a longitudinal cross-sectional view, the situation in which a fibrous material is scattered on the surface layer of concrete using a fibrous material scattering device according to yet another embodiment of the present invention.Figure 9 is an explanatory diagram illustrating the state of the fiber material dispersing device after it has moved a predetermined distance, as shown in a longitudinal cross-sectional view. The present invention's fiber material spreading device and concrete structure manufacturing method will be described below based on the embodiments shown in the figures. As shown in Figure 1, in this invention, fiber material 60 is scattered onto the surface layer 51a of poured, unhardened concrete 51 using a fiber material scattering device 1, thereby manufacturing a concrete structure 50 in which the fiber material 60 is embedded in the surface layer 51a. Here, the surface layer 51a refers to, for example, a depth of approximately 0 mm to 200 mm relative to the surface of the poured concrete 51. In this embodiment, the case of manufacturing a reinforced concrete slab with reinforcing bars 52 as the concrete structure 50 is illustrated. In the following description, the direction in which the fiber material scattering device 1 is moved during the scattering of the fiber material 60 will be referred to as the front-back direction, and the direction perpendicular to the front-back direction will be referred to as the left-right direction. The fibrous material 60 consists of fine, short fibers with a thickness (width, diameter) of approximately 0.3 mm to 1.5 mm and a length of approximately 10 mm to 50 mm. While the drawing schematically shows the fibrous material 60 in a large size, the actual fibrous material 60 is very fine, and the fibers 60 tend to entangle with each other and form clumps. Examples of fibrous material 60 include polypropylene fibers, vinylon fibers, polyethylene