JPH05337927A - Manufacturing method of concrete reinforcement - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a concrete reinforcing material having excellent fixation with concrete. [Structure] By winding the uncured yarn impregnated with the thermosetting resin around each of the plurality of uncured fiber yarns impregnated with the thermosetting resin one by one or more in sequence. A plurality of reinforcing fiber yarns are bundled and then the thermosetting resin is cured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved method of manufacturing a reinforcing material for concrete.

[0002]

2. Description of the Related Art Linear fiber reinforced plastics (hereinafter FR
It has been attempted to use P rod) as a concrete reinforcing material, but in this case, the problem is F
That is, the adhesion between the RP rod and concrete is low.

As a solution to this problem, the following methods (a) to (c) have been proposed.

(A) A method of imprinting an uneven shape on the surface of an FRP rod when the resin is cured.

(For example, Japanese Unexamined Patent Publication No. 63-138052) (b) A method of winding a filament on the surface of an FRP rod and hardening it.

(For example, Japanese Unexamined Patent Publication No. 63-139735) (c) A method of adopting a braided structure in which the surface becomes uneven when constructing an FRP rod.

(For example, JP-A-61-290150)

[0008]

However, each of the above methods has the following problems. That is, the method (a) cannot maintain the linear shape of the reinforcing fiber, resulting in a low strength utilization factor, and the method (b) causes a slip due to shearing force between the wound yarn and the reinforcing fiber. A sufficient adhesion effect cannot be obtained, and the method (c) has a low utilization rate of strength and elastic modulus as in the method (a), and cannot obtain unevenness of a sufficient size for adhesion.

The present invention solves the above-mentioned conventional problems,
It is intended to provide a simple manufacturing method of a concrete reinforcing material having excellent anchoring property to concrete.

[0010]

The present invention has the following constitution in order to solve the above problems.

That is, according to the present invention, one uncured yarn impregnated with a thermosetting resin is sequentially wound around each of a plurality of uncured reinforcing fiber yarns impregnated with a thermosetting resin.
The gist of the present invention is to provide a method for producing a concrete reinforcing material, which comprises winding a plurality of reinforcing fiber yarns by winding them more than once and then hardening the thermosetting resin.

The present invention will be described in detail below with reference to the drawings.

In FIG. 1, three uncured reinforcing fiber yarns 1, 2 and 3 impregnated with a thermosetting resin are used to improve the fixing of the reinforcing material to concrete on the outer periphery thereof. The uncured yarn 4 impregnated with the thermosetting resin forming the convex portion is wound and bundled at least once each. FIG. 1a is a cross-sectional view showing a focused state, FIG. 1b is a side view schematically showing each of them, and an arrow shows a winding direction.

The term "wrapping once or more" in the present invention means a state in which the thread 4 to be wound makes at least one rotation with respect to the axial center of the reinforcing fiber threads 1 to 3 as shown in FIG. 1a. To do.

The reinforcing fiber yarns 1, 2, and 3 are high-strength fiber yarns made of glass fiber, carbon fiber, etc., and their types are not particularly limited. In addition, the resin impregnated in this thread is epoxy resin, phenol resin, etc.
It is a resin that increases in fluidity by heating and then cures, and its type is not particularly limited.

Further, the reinforcing fiber yarns 1, 2, and 3 are slightly twisted before the winding of the yarn 4 (twist in the S or Z direction, which is the direction when the whole bundle is twisted). It is a twist in the opposite direction and will be described in detail later.).

The yarn 4 wound around the reinforcing fibers 1, 2, and 3 to form a convex portion is similar to the reinforcing fiber yarns 1, 2, and 3.
Or, it is a different type of yarn, and generally, the reinforcing fiber yarn 1,
Threads thinner than a few are used, but their size is set according to the required shape of the convex portion. The resin impregnated in the yarn 4 is a thermosetting resin having the same or similar properties as the resin used in the reinforcing fiber yarns 1, 2 and 3.

Further, the yarn 4 is reinforced with the reinforcing fiber yarns 1 before winding in order to maintain the circular cross section of the yarn.
It is preferable to have twists in the opposite directions to those of 2, 3 and, when the twist number is expressed by a twist angle, the twist angle is preferably 15 ° or more.

In the winding structure shown in FIG. 1, the yarn 4
First, the reinforcing fiber yarn 1 is wound around the outer circumference of the reinforcing fiber yarn 1 at least once in the S direction, and then is wound around the outer periphery of the reinforcing fiber yarn 1 at least once, and in the same direction or less.
The yarns 2 and 3 are bundled by the yarn 4. In order to make this converging form more perfect, it is preferable that the converging body obtained in FIG. 1 is further twisted in the S direction to form a twisted converging body. By this twisting, the yarn 4 is strongly pressure-bonded to the reinforcing fiber yarns 1, 2, 3.

Regarding the winding direction and the twisting direction of the yarn, the most preferable direction is S (Z) when the twisting direction of the reinforcing fiber yarns 1, 2 and 3 is the Z direction (or S). When the winding direction is S (Z) and the twisting direction of the bundle is S (Z), the strongest crimping action occurs [corresponding to each inside of ()] Due to this crimping action and the tension applied during resin curing, The resin is squeezed out, and the effect of maximizing the adhesion between the yarn 4 and the reinforcing fiber yarns 1, 2, 3 is generated.

Further, when tensile stress is generated in the reinforcing material of the present invention, the twist applied to the bundle causes the reinforcing fiber yarns 1, 2 and 3 to generate a pressure toward the center of the reinforcing material. Has the effect of further increasing the crimping force of the yarn 4 on the reinforcing fiber yarns 1, 2, 3.

Another structural example of the present invention is shown in FIG.

In this structure, the wound yarn 4 '
Has a structure in which each of the reinforcing fiber yarns 1 ', 2', and 3'is wound twice or more. In the present invention, it is necessary to wind at least one time. Overwrapping is preferable about 1 to 3 times because the bundle of reinforcing fiber threads becomes weak.

The number of reinforcing fiber yarns is 2 or more, and 2
An example of a book is shown in FIGS. 3a and 3b, but in the present invention, the number of reinforcing fiber yarns can be increased more than necessary.

In another embodiment of the present invention, as shown in FIG. 4, when there are three or more reinforcing fiber yarns, the reinforcing fiber yarns 5, 6 and 7 and the wrapping yarns 8 form a reinforcing fiber in the central space. The yarn 9 may be added and configured.

Further, in the present invention, a plurality of yarns 10, 10 'can be used as the wound yarn forming the convex portion as shown in FIG.

Further, the winding of the yarn in the present invention can be mass-produced by a machine utilizing the mechanism of the cord making machine.

The curing of the thermosetting resin in the present invention is
When the bundle is twisted and tensioned, the fluidized resin is squeezed out, and the reinforcing fiber yarn and the wound yarn are strongly bonded.

[0029]

EXAMPLES The present invention will be described in more detail below with reference to examples.

[Example 1] About 12,000 carbon fibers having a diameter of 7-8 µ were bundled, and 10 pieces of carbon fiber tow were bundled and impregnated with epoxy resin so that the resin content was 35% per 1 m. Twisting was performed 10 times in the Z direction to obtain the reinforcing fiber yarns 1, 2, and 3 shown in FIG.

Further, three carbon fiber tows are bundled, similarly impregnated with a resin, and then twisted in the S direction so that the twist angle is 25 °, and then the convex portion of the reinforcing material shown by 4 in FIG. As shown in FIG. 1, the reinforcing fiber yarns 1, 2 and 3 were wound around the reinforcing fiber yarns and the whole was bundled. The obtained bundle is twisted 10 times per 1 m in the S direction, and then 1
130 ° C x 30 under the condition that 0 Kg of tension is applied to the assembly.
Heat treatment was performed for minutes. As a result, the thermosetting resin is squeezed out to the surface of each yarn by the applied tension, the winding of the yarn 4, and the twisting, so that the reinforcing fiber yarns 1, 2, 3 and the wound yarn 4 become firm. It was possible to obtain a reinforcing material having an excellent fixing property with the combined concrete.

[0032]

According to the present invention configured as described above,
This is a remarkable effect that a concrete reinforcing material excellent in fixing property to concrete can be easily obtained.

[Brief description of drawings]

FIG. 1 is a view showing an example in which one winding yarn is wound around each of three reinforcing fiber yarns one by one or two times, (a) is a sectional view, and (b) is a side view. Is.

FIG. 2 is a diagram showing an example in which one wound yarn is wound around each of three reinforcing fiber yarns in sequence two to three times, in which (a) is a sectional view and (b) is a side view. Is.

FIG. 3 is a diagram showing an example in which one wound yarn is wound around each of two reinforcing fiber yarns one by one, in sequence, (a) is a sectional view, and (b) is a side view. ..

FIG. 4 is a cross-sectional view showing an example in which one reinforcing fiber yarn is interposed in the central portion of three reinforcing fiber yarns.

FIG. 5 is a side view showing an example in which two winding yarns are sequentially wound around each of three reinforcing fiber yarns once or twice.

[Explanation of symbols]

 1 Reinforcing fiber yarn 1'Reinforcing fiber yarn 2 Reinforcing fiber yarn 2'Reinforcing fiber yarn 3 Reinforcing fiber yarn 3'Reinforcing fiber yarn 4 Wrapping yarn 4'Wrapping yarn 5 Reinforcing fiber yarn 6 Reinforced fiber yarn 7 Reinforced fiber yarn 8 Wound yarn 9 Reinforced fiber yarn 10 Wound yarn 10 'Wound yarn

Claims (1)

[Claims] 1. A uncured yarn impregnated with a thermosetting resin is sequentially wound around each of a plurality of uncured reinforcing fiber yarns impregnated with a thermosetting resin one or more times. Thus, a method for producing a concrete reinforcing material, characterized in that a plurality of reinforcing fiber yarns are bundled, and then the thermosetting resin is cured.