JPH0814173B2 - Concrete reinforcing member and method for manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reinforcing member that is used by being embedded in concrete to reinforce concrete.

(Prior Art) Conventionally, it has been proposed to use a rod member made of fiber-reinforced thermosetting resin, which is formed by reinforcing a thermosetting resin with a bundle of a plurality of fibers extending in one direction, as a concrete reinforcing member.

For example, Japanese Patent Laid-Open No. 61-274036 discloses a rod-shaped reinforcing member including a core portion made of the fiber-reinforced thermosetting resin and an engaging portion formed around the core portion.

The locking portion is formed of a filament or roving that is spirally wound around the core portion and fixed to the peripheral surface of the core portion. The filament is wound after applying the thermosetting resin liquid on the peripheral surface of the core after forming the core, that is, after completely curing the thermosetting resin of the core. The liquid is heated and solidified to adhere to the core. Further, a thermosetting resin liquid is previously attached to the roving, and the roving is attached to the core portion by heating and solidifying the thermosetting resin liquid.

(Problems to be Solved by the Invention) When the conventional reinforcing member is embedded in concrete, the engaging portion engages with the concrete. The locking portion, when the reinforcing member is used as a reinforcing bar,
The tensile force applied to the concrete body formed by solidifying the concrete is transmitted to the core portion. Further, when the reinforcing member is used as a tension member in a pre-tension system, for example, the locking portion transmits the compressive stress from the core portion to the concrete body so as to introduce the pre-stress to the concrete body.

In any case, the structurally large tensile resistance of the core portion of the reinforcing member is utilized, but as is clear from the above, the force between the core portion and the concrete body is The transmission is performed via the locking portion. Therefore, it is desirable that the coupling strength between the core portion and the locking portion is as large as possible. However, the adhesive strength between the core portion and the locking portion is significantly smaller than the tensile resistance force of the core portion. Therefore, in the conventional reinforcing member, the tensile resistance force of the core portion is sufficient. Could not be utilized for.

In addition, there are cases where the locking portion is not always necessary in the application of the concrete reinforcing member. In such a case, and in the case of a reinforcing member having a locking portion defined by the winding roving, it is possible to prevent breakage of the reinforcing fiber, which adversely affects the tensile strength of the core portion when the reinforcing member is handled, and to prevent the reinforcement. In order to avoid alkali attack due to concrete when the working fibers are glass fibers, it is conceivable to apply a thermosetting resin liquid to the core and cover it with a film or layer formed by curing. However, as described above, it is not possible to obtain a large bond strength between the core portion and the membrane or layer, and therefore, a large force between the core portion and the membrane or layer cannot be obtained. Cannot be expected to be transmitted.

An object of the present invention is to provide a concrete reinforcing member and a method for manufacturing the same, which can sufficiently utilize the large tensile resistance of the fiber-reinforced thermosetting resin core.

(Means for Solving the Problem, Action and Effect of the Invention) A concrete reinforcing member according to the present invention includes a core portion formed by reinforcing a thermosetting resin with a bundle of a plurality of reinforcing fibers extending in one direction, A thermosetting resin coating portion having an uneven surface surrounding the core portion is included, and the thermosetting resin of the core portion and the thermosetting resin of the coating portion are bonded to each other by a crosslinking reaction. It is characterized by

According to the present invention, the core portion having a large tensile resistance and the coating portion that is responsible for the locking action on the concrete are integrally connected by the crosslinking reaction of these constituent resins, so that between the core portion and the coating portion. A large bond strength is imparted to the core portion, and the magnitude of the tensile resistance that the core portion bears depends on the breaking strength of the coating portion. The breaking strength of the coating greatly exceeds the bonding strength between the core and the coating when they are adhered without depending on the crosslinking reaction, and has a higher tensile resistance to the concrete body than the conventional reinforcing member. And it is possible to introduce greater prestress.

The concavo-convex surface of the covering portion can be defined by a protrusion or a depression provided in the covering portion, or can be defined by a protrusion of the covering by roving wound around the core portion.

Further, the covering portion may have a smooth surface instead of having an uneven surface. Such a reinforcing member can be used, for example, as a tension material in the post-tension system, and the covering portion has the same function of protecting the reinforcing fibers of the core portion and the concrete as the covering portion having the uneven surface. Has an alkali attack blocking effect.

The thermosetting resin of the coating portion may include a large number of chopped fibers, or the coating portion may include a plurality of rovings extending in the longitudinal direction of the core portion arranged at intervals in the circumferential direction thereof. it can. By this, also, by the roving wound on the core,
It is possible to increase the shear strength or compressive strength of the covering portion, particularly the uneven surface thereof.

The reinforcing member including the coating portion having the uneven surface defined by the protrusions or the depressions passes a fiber bundle composed of a plurality of reinforcing fibers to which a thermosetting resin liquid is attached, through a heated die, thereby The thermosetting resin liquid is semi-cured, and then another thermosetting resin liquid having a property of being capable of undergoing a crosslinking reaction with the thermosetting resin is attached to the peripheral surface of the fiber bundle, and then the uneven shape is formed. It can be formed by tightening and heating the fiber bundle to which the other thermosetting resin liquid is attached with a die composed of a plurality of divided pieces having an inner surface. The fiber bundle can be semi-cured by heating the fiber bundle, which is composed of a plurality of reinforcing fibers to which the thermosetting resin liquid is adhered, through a non-heated die.

In the present invention, the thermosetting resin liquid in a semi-cured state means that the crosslinking reaction of the resin liquid itself is in progress and another thermosetting resin liquid having a property capable of undergoing a crosslinking reaction with the resin liquid. It means a thermosetting resin liquid in a state of being capable of cross-linking with each other and being capable of being molecularly bonded with it.

The reinforcing member also has a property that a fiber bundle composed of a plurality of reinforcing fibers to which a thermosetting resin liquid is attached is passed through a die, and then a cross-linking reaction with the thermosetting resin is performed on the peripheral surface of the fiber bundle. After adhering the other thermosetting resin liquid having, by tightening and heating the fiber bundle to which the other thermosetting resin liquid is attached with a die consisting of a plurality of divided pieces having an uneven inner surface Can be formed.

Further, the reinforcing member including the covering portion having the uneven surface defined by the ridge by roving passes a fiber bundle composed of a plurality of reinforcing fibers to which a thermosetting resin liquid is adhered through a die, and rovings the fiber bundle. Wrap, then
On the peripheral surface of the fiber bundle, after adhering another thermosetting resin liquid having a property capable of crosslinking reaction with the thermosetting resin, the fiber bundle to which the other thermosetting resin liquid is attached, It can be formed by passing it through a heating furnace. By passing the fiber bundle through a heated die instead of passing through the heating furnace, a reinforcing member including a coating portion having a smooth surface can be formed.

(Example) As shown in FIG. 1, a concrete reinforcing member 10 according to the present invention includes a core portion 12 and a coating portion 14 surrounding the core portion and having an uneven surface. The present invention also includes a surface (not shown) in which the surface of the covering portion does not exhibit unevenness, that is, is smooth.

The reinforcing member 10 is embedded in concrete as a reinforcing bar or a tension material. In concrete, the uneven surface of the covering portion 14 is locked to the concrete, the core portion 12
The transmission of force between the concrete and the concrete takes place via the covering 14.

The core portion 12 is formed by reinforcing a thermosetting resin 18 with a bundle of a plurality of reinforcing fibers 16 extending in one direction. As the reinforcing fiber 16, for example, glass fiber, carbon fiber, aramid fiber or vinylon fiber can be used, and the thermosetting resin 18
As for example epoxy resin, unsaturated polyester resin,
Vinyl ester resin, phenol resin, etc. can be used.

The covering portion 14 is another thermosetting resin 20 of the same series as the constituent resin of the core portion 12, the thermosetting resin 20 mixed with a large number of chopped fibers (not shown), or in the circumferential direction of the core portion 12. The core portion is composed of a thermosetting resin 20 in which a plurality of rovings 22 arranged at intervals and extending in the longitudinal direction of the core portion 12 are embedded.
The constituent resin 18 of 12 and the constituent resin 20 of the coating portion 14 are molecularly bonded to each other by a crosslinking reaction of both. The molecular bond of these constituent resins imparts a large bond strength between the core part 12 and the covering part 14. Therefore, a large force can be transmitted from the concrete body formed of concrete to the core portion 12 or from the core portion 12 to the concrete body through the covering portion 14. When the glass fiber having the property of easily corroding in an alkaline atmosphere is used as the reinforcing fiber, the coating portion 14 constitutes a barrier layer against the alkaline atmosphere for the glass fiber with respect to the concrete having alkalinity.

The chopped fiber, roving 22 and core
Each constituent fiber of the winding roving described later on 12 is the same kind as the reinforcing fiber of the core portion 12,
It may be different. In either case, the coating 14
The chopped fiber or the roving disposed in the constituent resin 20 enhances the mechanical strength such as the shear strength and the tensile strength of the covering portion 14, which is dependent on the mechanical strength of the covering portion 14. Improves communication ability.

In the illustrated example, the uneven surface of the covering portion 14 is defined by the plurality of protrusions 24 and the plurality of depressions 26 formed in the covering portion 14. The planar shapes of the protrusion 24 and the depression 26 can be arbitrarily selected. As an alternative to this example, a roving (not shown) may be wound around the core 12 and the protrusion of the covering portion 14 may be defined by the winding roving. This roving will be described later in detail.

Next, a method of manufacturing the reinforcing member 10 of the present invention will be described with reference to FIG.

First, the fiber bundle 36 composed of a plurality of reinforcing fibers to which the thermosetting resin liquid is attached is passed through the heated die 38. Die 38
Can be heated by a heater (not shown) embedded in the die. The fiber bundle 36 can be obtained by passing a plurality of fibers aligned in one direction through a resin liquid tank (not shown) filled with the thermosetting resin liquid.

When the fiber bundle 36 passes through the hole 38a of the die 38, the fiber bundle 3
The cross-sectional shape of 6 is arranged to be substantially circular and the reinforcing fibers are adjusted to be evenly distributed in the cross-section. Further, the fiber bundle 36 is heated by the heat of the die 38 to be in a semi-cured state. The thermosetting resin liquid in the semi-cured state is undergoing a crosslinking (curing) reaction and is capable of undergoing a crosslinking reaction with another thermosetting resin liquid 40 described later. The fiber bundle 36 will later become the core 12.

As an example of the thermosetting resin liquid and the reinforcing fiber, an epoxy resin liquid and a carbon fiber can be used, respectively. In this case, the epoxy resin solution is about 12
In consideration of starting the curing at 0 ° C., the heating temperature of the die 38 is set to about 130 ° C., and the time required for the fiber bundle 36 to pass through the passage hole 38a is set to 7 to 30 seconds. The degree of the semi-cured state in the thermosetting resin liquid can be adjusted by changing the heating temperature of the die 38 and the time required for the fiber bundle 36 to pass through the passage hole 38a. The diameter of the fiber bundle can be set to about 8 mm, for example.

In the semi-cured state of the thermosetting resin liquid, in place of this example, the fiber bundle 36 is passed through an unheated die 38 to adjust the cross-sectional shape of the fiber bundle, and then a heating furnace (not shown) It can be obtained by passing through. In the case of the epoxy resin liquid, it is heated at 125 ° C., for example.

Next, adhesion exits the die 38, (which, for convenience, denoted by reference numeral 36 _1.) Fiber bundles in which the thermosetting resin liquid is in a semi-cured state and another thermosetting resin liquid 40 to the circumferential surface of the Let This is at room temperature, the supply port while the street hole 44a of the die 44 having a feed port 42 for the thermosetting resin liquid 40 through the fiber bundle 36 ₁
This can be performed by supplying the thermosetting resin liquid 40 from 42 under pressure. The through hole 44a is the through hole 38a of the heating die.
Have a larger diameter, thereby, a suitable thickness (e.g., 0.2 to 5 mm) layer of the thermosetting resin liquid 40 having is formed on the peripheral surface of the fiber bundle 36 _1. The fiber bundle a thermosetting resin solution 40 is deposited, for convenience, denoted by reference numeral 36 _2. The thermosetting resin liquid 40 is a resin of the same series as the constituent resin of the fiber bundle 36, preferably the same type of epoxy resin liquid. The layer of the thermosetting resin liquid 40 will later become the covering portion 14.

A chopped fiber (not shown) is preferably mixed in advance with the thermosetting resin liquid 40. For example, the chopped fiber may be a piece of carbon fiber cut into a length of 1 mm, and the weight ratio of the piece of carbon fiber to the thermosetting resin liquid 40 may be set to 20 to 30%. Further, the chopped with preparative fibers instead be incorporated or mixed with the chopped fibers, a plurality of rovings at intervals in the circumferential direction on the circumferential surface of the fiber bundle 36 ₁ extending in the longitudinal direction of the fiber bundle Place 22. In the illustrated example, the roving 22 has a through hole 44a in the die 44.
Is supplied near the entrance of. A plurality of rotatable rolls 46 around which the rovings 22 are wound are provided near the entrance of the passage hole 44a.
Are spaced around the fiber bundle 36 ₁ and each roll 4
Each roving 22 extending from 6 together with the fiber bundle 36 ₁
Proceed within 44a. A plurality of rovings 22 that extends in its longitudinal direction along the fiber bundle 36 ₁ is embedded in the layer of the thermosetting resin solution 40 just before passing through the through hole 44a. The chopped fiber and the roving 22 reinforce the constituent resin 20 of the coating portion 14.

Instead of passing the fiber bundle 36 ₁ through the die 44, the fiber bundle 36 ₁ is filled with a resin bath (not shown) made of a thermosetting resin liquid 40.
You may pass through.

Thereafter, the fiber bundle 36 _2, from around it, fastened in a heated die 50 consisting of a plurality of divided pieces 48 having an uneven inner surface (not shown). Accordingly, the unevenness of irregularities and symmetrical inner surfaces of the split pieces 48 are formed on the surface of the fiber bundle 36 _2, and a thermosetting resin liquid and uncured heat was in the semi-cured state of the fiber bundle 36 ₂ Heat is applied to the curable resin liquid 40 to cure them almost completely. During this period, the thermosetting resin liquid in the semi-cured state and the uncured thermosetting resin liquid 40 are firmly bonded to each other. Epoxy resin solution described above, in the case of fiber bundles 36 ₂ made of carbon fibers or the like, the time tightening by heating temperature and the die 50 of the die 50 can be set to 0.99 ° C. and 4-5 minutes.

It is possible to alternately use two sets of dies 50 that are movable in the longitudinal direction of the fiber bundle. According to this, after a predetermined tightening time has elapsed, each of the divided pieces 48 of the rear die (to the right in FIG. 2) is moved in the radial direction, and while maintaining this state, the front portion of the die being tightened is maintained. be translated immediately before the die 50, again, to tighten the fiber bundle 36 ₂ is moved toward the fiber bundle. Each divided piece 48 has a built-in heater (not shown) for heating.

Here, in place of the die 50, using a non-divided heating die having a smooth inner surface not having irregularities (not shown), if passed to the fiber bundle 36 ₂ to the die, coating the smooth surface A reinforcing member having a portion can be obtained.

The fiber bundle is a product 10 that has been subjected to a molding process using a die 50.
Can be moved by the pair of feed rollers 52.

As an alternative to the example described above, the die 38 can be unheated. Therefore, in this case, the thermosetting resin forming a part of the fiber bundle 36 is in an uncured state like the thermosetting resin 40 supplied when passing through the die 44, and the thermosetting resin liquid 40 Is mixed with the resin liquid at the time of feeding.

Further, instead of the example described above, after the fiber bundle 36 ₁ exits the heated or unheated die 38 and before entering the die 44, a roving (not shown) may be screwed on the fiber bundle 36 ₁ for example. It is wound linearly or continuously, for example a number of rovings are wound discontinuously at intervals. The portion around which the roving is wound will be the fiber bundle 36 ₁ later.
It is covered with a thermosetting resin liquid 40 attached to. At this time,
The layer of the resin liquid 40 having a substantially equal thickness rises at the portion around which the roving is wound and does not rise at other portions. The raised portion and the non-raised portion define the uneven surface of the resulting covering of the reinforcing member. However, in this case, instead of tightening and heating the fiber bundle 36 ₂ with the die 50, the fiber bundle 36 ₂
Pass ₂ through a heating furnace (not shown). Further, the fiber bundle 36 ₂ in place of the heating furnace, if passed to the heating die (not shown) having an inner surface comprising an uneven inner surface from having no cylindrical surface, a reinforcing member comprising a covering portion having a smooth surface Is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a reinforcing member according to the present invention, and FIG. 2 is a process drawing schematically showing the method of the present invention. 10: Reinforcement member, 12: Core part, 14: Cover part, 16: Reinforcing fiber, 18, 2
0: Thermosetting resin, 22: Roving, 24, 26: Protrusions and depressions, 36, 36 ₁ , 36 ₂ : Fiber bundle, 38, 44: Die, 40: Thermosetting resin liquid, 48, 50: Divided pieces And die.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 999999999 Arisawa Manufacturing Co., Ltd. 1-5-5 Minamihonmachi, Joetsu City, Niigata Prefecture (72) Inventor Toshiyuki Kattada 4-40-6 Higashiomiya, Omiya City, Saitama Prefecture (72) Invention Abe Genji 1-3-3-15 Yotsuya, Fuchu-shi, Tokyo (72) Inventor Hironobu Nishiyama 4-1-32 Mita, Minato-ku, Tokyo 4-1-32 Claire Mita 606 (72) Inventor Kentaro Fujii 4-1096 Mitsuhomi-cho, Narashino City, Chiba Prefecture (72) Yuichi Tanaka 1-5-5 Minamihonmachi, Joetsu City, Niigata Prefecture Arisawa Manufacturing Co., Ltd. (56) References JP 63-221035 (JP, A) JP 63-236848 (JP, A) ) JP-A-61-274036 (JP, A)

Claims (12)

[Claims] 1. A core portion formed by reinforcing a thermosetting resin with a bundle of a plurality of reinforcing fibers extending in one direction, and surrounding the core portion,
A thermosetting resin coating portion having an uneven surface, and the thermosetting resin of the core portion and the thermosetting resin of the coating portion are bonded to each other by a crosslinking reaction. , Concrete reinforcement. 2. The concrete reinforcing member according to claim 1, wherein the uneven surface of the covering portion is defined by a plurality of protrusions and a plurality of depressions provided on the covering portion. 3. The uneven surface of the covering portion is defined by the protrusion of the covering portion by roving wrapped around the core portion and covered by the covering portion. Concrete reinforcement member. 4. A core portion formed by reinforcing a thermosetting resin with a bundle of a plurality of reinforcing fibers extending in one direction, and surrounding the core portion,
Consisting of a thermosetting resin coating having a smooth surface, characterized in that the thermosetting resin of the core and the thermosetting resin of the coating are bonded to each other by a crosslinking reaction, Concrete reinforcement member. 5. The concrete reinforcing member according to claim 1, wherein a large number of chopped fibers are mixed in the thermosetting resin of the coating portion. 6. The concrete reinforcing member according to claim 1, wherein a plurality of rovings extending in the longitudinal direction of the core portion are arranged in the covering portion at intervals in the circumferential direction thereof. . 7. The concrete reinforcing member according to claim 4, further comprising a roving wound around the core portion and covered with the covering portion. 8. A fiber bundle consisting of a plurality of reinforcing fibers to which a thermosetting resin liquid is attached is passed through a heated die, thereby bringing the thermosetting resin liquid into a semi-cured state, and then the fibers. On the peripheral surface of the bundle, another thermosetting resin liquid having a property capable of cross-linking reaction with the thermosetting resin is adhered, and then the other die is composed of a plurality of divided pieces having an uneven inner surface. A method for manufacturing a concrete reinforcing member, comprising tightening and heating a fiber bundle having a thermosetting resin attached to a peripheral surface thereof. 9. A fiber bundle composed of a plurality of reinforcing fibers to which a thermosetting resin liquid is attached is passed through a die, and then the fiber bundle is heated, whereby the thermosetting resin liquid is semi-cured. Then, on the peripheral surface of the fiber bundle, after adhering another thermosetting resin liquid having a property capable of cross-linking reaction with the thermosetting resin, with a die composed of a plurality of divided pieces having an uneven inner surface. A method for manufacturing a concrete reinforcing member, which comprises tightening and heating a fiber bundle having the other thermosetting resin attached to a peripheral surface thereof. 10. A fiber bundle composed of a plurality of reinforcing fibers to which a thermosetting resin liquid is adhered is passed through a die, and then a peripheral surface of the fiber bundle has a property capable of undergoing a crosslinking reaction with the thermosetting resin. After adhering another thermosetting resin liquid, the other thermosetting resin is clamped and heated with a die consisting of a plurality of divided pieces having an uneven inner surface to clamp and heat the fiber bundle attached to the peripheral surface, Manufacturing method of reinforcing member. 11. A fiber bundle composed of a plurality of reinforcing fibers to which a thermosetting resin liquid is attached is passed through a die, roving is wound around the fiber bundle, and then the thermosetting resin is applied to the peripheral surface of the fiber bundle. After adhering another thermosetting resin liquid having a property capable of undergoing a crosslinking reaction with a resin, the fiber bundle having the other thermosetting resin attached to the peripheral surface is passed through a heating furnace to produce a concrete reinforcing member. Method. 12. A fiber bundle consisting of a plurality of reinforcing fibers to which a thermosetting resin liquid is attached is passed through a die, roving is wound around the fiber bundle, and then the thermosetting resin is applied to the peripheral surface of the fiber bundle. After adhering another thermosetting resin liquid having a property capable of undergoing a crosslinking reaction with the resin, the fiber bundle having the other thermosetting resin attached to the peripheral surface is passed through a heated die, a concrete reinforcing member. Manufacturing method.