JPS61241103A - Manufacture of fiber reinforced concrete - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for producing fiber-reinforced concrete in which fibers are mixed into concrete in order to increase the tensile strength of the concrete. The present invention relates to a method for producing fiber reinforced concrete that can impart directionality to the arrangement.

[Prior Art] Generally, fiber-reinforced concrete in which a fiber material is mixed into the concrete in order to increase the tensile strength of the concrete is known. This fiber-reinforced concrete is made by kneading steel fiber, carbon fiber, glass fiber, or other fibrous materials into fresh concrete and hardening it by pouring it.
As shown in the figure, the tensile strength of the concrete a is improved by sharing the tensile load F generated within the concrete a due to the load W applied to the concrete a, etc., to the fiber material mixed inside the concrete a.

[Problems to be solved by the invention] By the way, conventional fiber-reinforced concrete is made by simply kneading fiber materials into fresh concrete and curing it by casting, and it is necessary to provide directionality to the arrangement of the fiber materials. I couldn't do it. For this reason, the fibers in hardened concrete a were individually oriented in all directions, and the tensile strength of concrete a was uniformly increased in all directions.However, as shown in factor 6, For example, in a concrete plate e that is adopted as a bridge floor plate and has a predetermined span β and is supported at both ends c and d, the tensile load F
occurs mainly along the longitudinal direction between the fulcrums, so in order for the fibrous materials mixed in the concrete plate e to function efficiently, it is necessary to arrange the fibrous materials approximately along the direction of the tensile load F. was there.

[Object of the invention] The present invention was created in consideration of the above circumstances, and
The purpose is to provide a method for producing fiber-reinforced concrete that can impart directionality to the arrangement of fiber materials mixed in concrete.

[Summary of the invention] In order to achieve the above object, the present invention involves bonding a magnetic material to the end of a fibrous material made of a non-magnetic material such as glass fiber or carbon fiber, and kneading the fibrous material into ready-mixed concrete. After placing the concrete, a magnetic field is applied to the placed fresh concrete during the hardening process to move the magnetic material, thereby imparting directionality to the arrangement of the fiber materials and hardening the fresh concrete. The gist is that.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

First, the fiber material used in the method for producing fiber reinforced concrete according to the present invention and mixed into the concrete to impart directionality to its arrangement will be explained. As shown in Fig. 5, fiber material 1 made of non-magnetic material such as glass fiber or carbon fiber is used as the fiber material 1 mixed inside the concrete to share the tensile load acting on the concrete. A magnetic material 2 such as an iron piece or steel fiber is bonded to the end of the fiber material 1 by adhesive or the like.

Next, the fibrous material 1 with the magnetic material 2 bonded to the end thereof is kneaded into fresh concrete, and as shown in FIG. At this time, the fiber materials 1 mixed into the poured fresh concrete 4 are individually oriented in all directions, and there is no directionality in their arrangement.

Once the pouring of ready-mixed concrete 4 is completed, next
As shown in the figure, during the hardening process of the poured fresh concrete 4, magnets 5a and 5
b etc. are brought close to each other, a magnetic field 6 is applied, and the magnetic body 2 bonded to the end of the fiber material 1 is moved by the magnetic force. At this time, the magnet 5a is aligned along the direction (a) of the tensile load that will act on the cast and formed concrete plate (wall) e.

5b to move the magnetic body 2 onto the concrete plate e.
As shown in FIG. Arrange them along the direction of the load. invasion,
Fresh concrete 4 is solidified and fiber material 1 mixed inside
A fiber-reinforced concrete 7 is formed in which the fiber-reinforced concrete 7 is given directionality in its arrangement.

In addition, when moving the magnetic material 2 within the ready-mixed concrete 4, the ready-mixed concrete 4 may be vibrated by excitation or the like to facilitate the movement of the magnetic material 2, and the direction in which the fiber materials 1 are arranged may be With respect to a plane perpendicular to the main direction component of the tensile load that will act on the formed concrete plate (wall) e, at least each fiber material 1 crosses the perpendicular plane and lies along the direction of the tensile load. You can do it like this.

That is, as is clear from the above explanation, according to the method for manufacturing fiber reinforced concrete 7 according to the present invention, there is no directionality in the arrangement of the fiber materials 1 mixed into the concrete plate (wall) e etc. to be cast and formed. can be granted. Therefore, as shown in FIG. 4, for example, when a concrete plate e is supported at both ends c and d in the longitudinal direction with a predetermined span β (such as a deck plate of a bridge), the concrete plate e If the manufacturing method of the fiber-reinforced concrete 7 of the present invention is adopted for forming the concrete plate C, the fibers mixed into the concrete plate C will be picked up by the main direction component of the tensile load F acting on the concrete plate e. Material 1 can be arranged in advance,
The tensile load F acting on the concrete plate e can be efficiently and effectively shared by the IIN material 1, and its tensile strength can be improved as much as possible.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are achieved.

(1) After joining a magnetic material to the end of 81M material made of non-magnetic material such as glass fiber or carbon fiber, and kneading the fiber material into ready-mixed concrete and placing it, the placed ready-mixed concrete By applying a magnetic field to the placed fresh concrete before it hardens, the magnetic material bonded to the end of the fiber material is moved by the magnetic force, so that the inside of the fiber-reinforced concrete that is poured and hardened is
Directionality can be given in advance to the arrangement of the I materials.

(υ Since the fiber materials inside the fiber-reinforced concrete that is poured and solidified can be arranged in advance in the direction of the main component of the tensile load that will act on the IIM-reinforced concrete, the tensile load can be efficiently handled. The tensile strength of the sin-reinforced concrete can be increased as much as possible by effectively sharing the load with the 8M material.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams illustrating the pouring and forming procedure of the method for manufacturing fiber-reinforced concrete according to the present invention, and Figure 4 shows an example of the use of the fiber-reinforced concrete formed by the method for producing fiber-reinforced concrete according to the present invention. Figures 5 and 5 are diagrams showing a sui material used in the method for manufacturing fiber-reinforced concrete of the present invention, and Figure 6 is a diagram showing conventional fiber-reinforced concrete. In the figure, 1 is a fibrous material made of non-magnetic material, 2 is a magnetic material bonded to the end of the fibrous material, 4 is ready-mixed concrete that has been kneaded and cast with the fibrous material bonded to the magnetic material, and 6 is a magnetic field. , 7 is cast-formed fiber reinforced concrete. Patent applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Patent attorney: Nobuo Kinutani Figure 1 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In a method for manufacturing fiber-reinforced concrete in which a fiber material is mixed inside to share the tensile load acting on the concrete, a magnetic material is bonded to the end of a fiber material made of a non-magnetic material such as glass fiber or carbon fiber. Then, after kneading and pouring the fiber material into fresh concrete, a magnetic field is applied to the poured fresh concrete during the solidification process of the fresh concrete to move the magnetic material and align the fiber material. A method for producing fiber-reinforced concrete characterized by imparting directionality.