JPH09314731A - Manufacture of fiber reinforced sheet for repairing/ reinforcing concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability, handling, and strength of repairing/ reinforcement by a method in which reinforcing fibers are arranged in one direction on one side of a net fabric reinforcing fiber support which is impregnat ed with a thermoplastic resin and dried, adjusted uniformly, and fusion-bonded by heating and pressing. SOLUTION: Reinforcing fibers 11 are arranged in one direction on one side of a net fabric reinforcing fiber support 10 which is impregnated with a thermoplastic resin and dried, adjusted uniformly, and fusion-bonded by heating and pressing to form a fiber reinforced sheet for repairing and reinforcing a concrete structure. In this process, the support 10 is made by a method in which a thermoplastic resin is impregnated with organic fibers having good resistance such as carbon fibers and glass fibers or thermoplastic fibers and dried or a thermoplastic fiber fabric. Accordingly, since all the inside structure of the support 10 and the reinforcing fibers 11 is kept non-curable and in a non-adhesion state, when a room temperature curing liquid resin is applied, the resin penetrates promptly, uniformly, and completely between the reinforcing fibers 11 to demonstrate strong adhesive force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a reinforced fiber sheet for repairing or reinforcing reinforced concrete bridges, elevated roads, tunnels, building structures, etc., and particularly to uniform repair or reinforcement work. Of a reinforced fiber sheet for maintenance and easiness of handling, shortening of repair or reinforcement work, increased strength after repair or reinforcement, repair and reinforcement of concrete structures having excellent durability and vibration resistance It is about.

[0002]

2. Description of the Related Art Repair and reinforcement work to be carried out when defects are found in a concrete structure after construction include a steel plate reinforcement method, a special fiber reinforcement method, or a method of appropriately mixing these. . Even in this, as a reinforcing method using a special fiber material, as shown in FIG.
After the anchor plate 2 is placed on the upper surface of the beam 1 and fixed with the bolts 3, the reinforcing fiber sheet 4 is rotated around the side surface and the lower surface of the beam 1 and the upper end of the reinforcing fiber sheet 4 is fixed at the angle A. There is known a method B in which the upper surface of the beam is left as it is and the reinforcing fiber sheet 4 is attached only to the side surface and the lower surface of the beam 1 and the upper end of the reinforcing fiber sheet 4 is fixed with bolts 6.

As shown in FIG. 2, a reinforcing fiber sheet having such a purpose is obtained by applying an adhesive or a resin b made of an accelerated curing agent on one side or both sides of a support a made of deformed paper or a film. And the reinforcing fibers c having excellent reinforcing properties are arranged, pressed and joined. This reinforcing fiber sheet is easy to work and is attached to the support with a resin having good handleability to reinforce the concrete structure.

The resin used for fixing the reinforcing fiber sheet previously attached to the structure at the work site in the repair / reinforcement work of the concrete structure is a hardening accelerator matrix resin for storing the unidirectional array of the reinforcing fibers. A part is fixed to the solid form instead of the (A type), and at the time of construction, the room temperature curing type (B type) resin is used to mix well with the reinforcing fiber sheet already attached to the reinforcing structure. To do so.

Therefore, a lot of rolling (rubbing with a roll) is required at the time of construction for mutual good impregnation, but the pot life (= Work) of the room temperature matrix resin is required.
Life) has a drawback that workability and handleability are not good. Pot Life, Work Life (Working Li
This is also referred to as fe), and it means the time taken until the viscosity becomes higher than when a curing agent is added to the resin and the resin cannot be used as a result. If the working time is short for any of the sheets, the impregnation and mixing are partially left. Therefore, it is difficult to obtain the desired strength. In other words, it is difficult to mix with the resin for room temperature and the impregnation is not improved, so that the peeling phenomenon is likely to occur. Due to this problem, there is a difficulty in strength reduction and process control, and it is natural that the repair / reinforcement effect on concrete structures does not reach the expected value.

Therefore, the object of the present invention is to maintain the uniformity of repair / reinforcement work, and also to facilitate the handling, shorten the process, increase the strength of repair / reinforcement, and the concrete structure excellent in durability and earthquake resistance. It provides a reinforced fiber sheet for repair and reinforcement.

[0007]

However, although the concrete structure is semi-permanent, there are some cases in which unexpected problems appear after construction. Therefore, it is emerging as a social problem in which repairs and reinforcements for such problems are large. Such unfavorable phenomena of concrete structures include neutralization of materials, rusting of reinforcing bars, flock due to expansion, peeling phenomenon of concrete surface layer, structural defects, use of low-grade concrete and defective materials, low This is due to construction quality, increase in vehicle traffic, excess of vehicle load, speeding up of trains, and vibration of repeated running exceeding design values. It is analyzed that the main causes are accumulated overload and repeated load of the structure, chemical changes due to salt and pollutants in the air.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and employs the following technical means. In the invention according to claim 1, the reinforcing fibers are unidirectionally arranged on one surface of the net-woven fabric reinforcing fiber support which is impregnated with the thermoplastic resin and dried, and after uniform adjustment, heating and pressing are performed for fusion. We adopted the technical means.

According to the invention of claim 2, claim 1
In addition to the invention described above, the reinforcing fiber support is a glass fiber having excellent resistance, carbon fiber, aramid fiber, vinylon, one obtained by impregnating and drying an organic fiber mesh fabric such as Kevlar into a thermoplastic resin, or a thermoplastic fiber. The technical means of being a net-making woven fabric which is a biaxial or triaxial woven fabric was adopted.

According to the invention of claim 3, claim 1
In addition to the described invention, a technical means of covering the above-mentioned reinforcing fiber with a second reinforcing fiber support and heating / pressurizing and fusing is adopted.

According to the invention of claim 4, claim 1
In addition to the described invention, a second member may be provided on the other surface of the reinforcing fiber support.
The technical means of arranging the reinforcing fibers in one direction, adjusting them uniformly and flatly, and then fusing them was adopted.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described. The present invention is a woven fabric reinforced fiber support which is excellent in resistance and impregnated with a thermoplastic resin and dried, or a woven fabric reinforced fiber support made of a thermoplastic resin is unidirectionally provided with excellent reinforced fiber on one side. Provided is a reinforced fiber sheet for repairing / reinforcing a concrete structure, which is arranged in a uniform shape, adjusted to be uniform and flat, and then heated, pressed and fused.

According to the present invention, a lower reinforcing fiber support made of a net woven fabric which is excellent in durability and impregnated with a thermoplastic resin and dried or a reinforced fiber support made of a thermoplastic woven fabric made of a thermoplastic fiber is reinforced with excellent reinforcement. A net woven fabric made of a net woven fabric upper support or a thermoplastic fiber, in which the fibers are arranged in one direction to be uniformly and flatly adjusted, and the reinforced fiber has excellent resistance and is impregnated with a thermoplastic resin and dried. Provided is a reinforcing fiber sheet for repairing / reinforcing a concrete structure in which a reinforcing fiber support made of material is placed and heated, pressurized and fused.

Next, according to the present invention, each reinforcing fiber is provided on both sides of a woven fiber reinforced fiber support which is excellent in durability and impregnated with a thermoplastic resin and dried, or a woven fiber reinforced fiber support made of thermoplastic fibers. Provided is a reinforcing fiber sheet for repairing / reinforcing a concrete structure which is arranged in one direction and uniformly and flatly adjusted, and then heated, pressurized and fused.

[0015]

The present invention will be described in detail below with reference to FIG. FIG. 3A is a reinforcing fiber sheet in which reinforcing fibers 11 having excellent reinforcing properties are fused to the flat surface of the reinforcing fiber support 10 which has been dried by being impregnated with a thermoplastic resin having excellent resistance. The reinforcing fiber support 10 is made by impregnating a thermoplastic resin with an organic or thermoplastic fiber having excellent resistance to carbon fiber, glass fiber, Kevlar fiber, aramid fiber, etc., and drying it, or a thermoplastic fiber mesh. It is a woven fabric, and is a biaxially or triaxially woven mesh fabric structurally.

In this reinforcing fiber sheet, as shown in FIG. 4A, a roll-shaped reinforcing fiber support 10 and a large number of bundles of reinforcing fibers 11 are simultaneously fed out and passed between pressure contact rolls 14 to arrange the reinforcing fibers 11 in the same direction. Adjust evenly and evenly. Next, the above-mentioned reinforcing fiber sheet is obtained by passing through a heater 15 which emits heat of a fusion standard amount to fuse and then passing through a joining roll 16 and hardening. After the fusing, the deformed paper 17 is adhered to the back surface of the reinforcing fiber support 10 to protect the adhesive surface adhered to the surface of the concrete structure more safely than foreign substances.

FIG. 3B relates to another embodiment of the present invention. As shown in FIG. 4A, this reinforcing fiber sheet includes a roll-shaped lower reinforcing fiber support 10 having a large number of bundles of reinforcing fibers 11 and upper reinforcing fiber supports. The body 12 is unreeled at the same time and is passed between the pressure contact rolls 14 at one time to arrange the reinforcing fibers 11 in the same direction and at the same time adjust the fibers uniformly and flatly. Then, the heater 15 and the bonding roll 16 are sequentially passed and fused to obtain the reinforcing fiber sheet as described above. After the fusing, the shaped paper 17 is attached to the back surface of the reinforcing fiber support 10 on both sides.

FIG. 3C shows another embodiment of the present invention, in which the above-mentioned reinforcing fiber support 10 and the reinforcing fibers 11 and 13 are simultaneously fed out from both sides thereof and passed through the pressure contact roll 14 to pass the reinforcing fibers 11 and 13. Arranged in one direction and uniformly
Adjust to flat. Next, the heater 15 and the joining roll 16 are sequentially passed through to be fused, and then the profile paper 17 is attached to each outer surface of the reinforcing fibers 11 and 13 to obtain a reinforcing fiber sheet.

In any of the above-mentioned embodiments, since the internal structures of the reinforcing fiber supports 10 and 12 and the reinforcing fibers 11 and 13 are all kept in a non-curable and non-adhesive state, the liquid for room temperature curing is eventually obtained. When the resin is applied, it serves as a basis for rapidly, uniformly and completely penetrating between the reinforcing fiber yarns to exhibit a strong adhesive force. In each figure of FIG. 3, reinforcing fibers 11, 1
3 is illustrated as a horizontal ellipse, which is a virtual illustration of a state in which the initially circular cross section is depressed and pressed during the pressure contact.

At the time of repairing or reinforcing work, a liquid resin for room temperature curing is thinly applied to the surface of a transverse beam or the like of a concrete structure, covered with a reinforcing fiber sheet, and then rubbed with a roll once or twice. At this time, the line of reinforcing fibers is placed in the cross-sectional direction of the transverse beam. Then, a liquid resin for room temperature curing is further applied to the surface of the reinforced sheet and rubbed with a roll about once or twice.

As described above, according to the present invention, the resin (A type) impregnated in the reinforcing fiber sheet in advance and the liquid resin (B) for room temperature curing are used.
Shape) and stop the mixed coating method with room temperature curing liquid resin (B
Shape) is used to bond the reinforcing fiber sheet. The liquid resin for room temperature curing is the reinforcing fiber support 10 or 10, 12,
It quickly penetrates into the reinforcing fibers 11 or 11, 13 and then adheres to the surface of the concrete structure.

As described above, when the reinforcing fiber sheet provided by the present invention is made of a thermoplastic resin or a thermoplastic resin which is wound around a reinforcing fiber support, the surface portion of the thermoplastic resin is melted by heat to reinforce the reinforcing fiber sheet. To join the
The obtained reinforcing fiber sheet 4 is dry and flexible.

[0023]

As a result of adopting the above configuration, the present invention provides
The following effects can be obtained. (1) Handleability, workability, transportability, spreadability, workability, compared with conventional reinforced fiber sheets bonded with thermosetting resin
It surpasses conventional sheets bonded with thermosetting resin in terms of storability. Further, since it is excellent in flexibility, it is extremely easy to enclose the surface of a lateral beam or the like of a concrete structure or the like that requires repair or reinforcement work.

(2) The impregnation problem of the adhesive resin due to the fact that the reinforcing fiber support has the bonding property is completely solved. Not only that, after the repair / reinforcement is performed, the adhesion of the room temperature curing liquid resin to the concrete structure is excellent and the peeling phenomenon of the reinforcing fiber sheet is suppressed as much as possible, and a complete integrated composite repair / reinforcement structure. Can be obtained. And, it is possible to perform highly precise repair / reinforcement work within a short time.

[Brief description of drawings]

FIG. 1 is an illustration showing a conventional method for reinforcing a concrete structure requiring repair or reinforcement with an iron plate, a reinforcing fiber and a carbon fiber.

FIG. 2 is a cross-sectional view of a conventional reinforcing fiber sheet for repairing / reinforcing a concrete structure, in which A is a single-sided support structure and B is a double-sided support structure.

FIG. 3 is a cross-sectional view of a reinforcing fiber sheet for repairing / reinforcing a concrete structure according to the present invention, where A is a single-sided support structure, B is a double-sided support structure, and C is a double-sided reinforcing fiber structure. It is sectional drawing shown.

4A, 4B and 4C are front views schematically showing an apparatus for manufacturing the reinforcing fiber sheet shown in FIGS. 3A, 3B and 3C.

[Explanation of symbols]

1 ... beam 2 ... anchor plate 3 ... bolt 4 ... reinforcing fiber sheet 5 ... angle 6 ... bolt 10 ... reinforcing fiber support 11 ... reinforcing fiber 12 ... reinforcing fiber support 13 ... strengthening Fiber 14 ... Pressure contact roll 15 ... Heater 16 ... Joining roll 17 ...

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[Procedure amendment]

[Submission date] May 19, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

[Fig. 1]

FIG. 2

[Fig. 3]

[Fig. 4]

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location B29K 105: 08 (72) Inventor Zhao Seung-guk, Kaya-dong 590-Kayasang, Gyeongsangnam-do, Republic of Korea 41 Tianyu Apartment Building 305 (72) Inventor Zheng Yi Mamoru, Republic of Korea, Gyeongsangnam-do 103 Hakryong-dong, Dowon Central Apartment 103, Datong Central Apartment, 1603

Claims (4)

[Claims] 1. A woven fiber reinforced fiber support impregnated with a thermoplastic resin and dried, and reinforced fibers are unidirectionally arranged on one side of the woven fiber support. After uniform adjustment, heating and pressing are performed for fusion. Method for manufacturing reinforced fiber sheet for repair and reinforcement of concrete structure. 2. The reinforcing fiber support is obtained by impregnating a thermoplastic resin with an organic fiber mesh fabric such as glass fiber, carbon fiber, aramid fiber, vinylon, and Kevlar, which has excellent resistance, and drying the thermoplastic fiber. The method for producing a reinforced fiber sheet for repair / reinforcement of a concrete structure according to claim 1, wherein the woven fabric is a biaxial or triaxial woven fabric. 3. A reinforcing fiber sheet for repairing / reinforcing a concrete structure according to claim 1, wherein the reinforcing fiber sheet is covered with a second reinforcing fiber support and heated / pressurized for fusion bonding. Production method. 4. The concrete structure according to claim 1, wherein the second reinforcing fibers are arranged in one direction on the other surface of the reinforcing fiber support, adjusted to be even and flat, and then fused. Manufacturing method of reinforced fiber sheet for repair and reinforcement.