JP2990347B2 - Manufacture of fiber reinforced sheet for repairing/ reinforcing concrete structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a reinforced fiber sheet for repairing or reinforcing bridges, elevated roadways, tunnels, building structures, etc. made of reinforced concrete, and more particularly, to a method of repairing or reinforcing the same. Method of manufacturing reinforced fiber sheet for repair / reinforcement of concrete structures having excellent durability, easy handling, shortened repair / reinforcement process, increased strength after repair / reinforcement, excellent durability and vibration resistance It is about.

[0002]

2. Description of the Related Art As a repair / reinforcement work to be performed when a defect is found in a concrete structure after construction, there is a method of reinforcing an iron plate material, a method of reinforcing a special fiber material, or a method of appropriately mixing these. . Among them, as a reinforcing method using a special fiber material, as shown in FIG.
After fixing the anchor plate 2 on the upper surface of the beam 1 and fixing it with the bolts 3, the reinforcing fiber sheet 4 is turned around the side and lower surfaces of the beam 1, and the upper end of the reinforcing fiber sheet 4 is fixed at the angle 5. A method B is known in which the reinforcing fiber sheet 4 is turned only on the side surface and the lower surface of the beam 1 while leaving the upper surface of the beam 1 as it is, 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 an application is obtained by applying an adhesive or a resin b comprising an accelerated curing agent to one or both sides of a support a made of irregularly shaped paper or a film. In this case, reinforcing fibers c having excellent reinforcing properties are arranged and joined by pressing. The reinforcing fiber sheet is easy to work and adheres to the support with a resin having good handleability to reinforce the concrete structure.

[0004] In the repair and reinforcement work of a concrete structure, a resin used for fixing a reinforcing fiber sheet previously attached to the structure at a work site is a curing accelerator matrix resin for preserving a unidirectional array of reinforcing fibers. A part is fixed in a solid form instead of (A type), and at the time of construction, a room temperature curing type (B type) resin is used to mix well with the reinforcing fiber sheet already attached to the reinforcing structure. Is to do so.

[0005] Therefore, a lot of rolling (rubbing with a roll) is required at the time of construction for mutual good impregnation, but the pot life of the matrix resin at normal temperature (= Work)
Life) has a disadvantage that workability and handleability are not good. Pot Life, Work Life (Working Li
This is also referred to as fe), which refers to the time required until the viscosity becomes higher than when the curing agent is added to the resin and the resin cannot be used as a result. If the working time is insufficient for any of the sheets, partial impregnation and mixing are left in an incomplete state. For this reason, 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 good, so that a peeling phenomenon is easily caused. Due to this problem, there is a problem in strength reduction and process control, and it is natural that the effect of repairing and reinforcing concrete structures does not reach the expected value.

Accordingly, an object of the present invention is to maintain a uniform repair / reinforcement work, and furthermore, to provide a concrete structure having excellent handling, shortening the process, increasing the strength of the repair / reinforcement, and having excellent durability and earthquake resistance. It is intended to provide a reinforced fiber sheet for repair and reinforcement.

[0007]

However, although concrete structures are semi-permanent, there have been cases in which unexpected problems appear after construction. Therefore, repair and reinforcement of such problems have emerged as a major social problem. Such undesired phenomena in concrete structures include neutralization of materials, rusting of reinforcing bars, flocks due to expansion, delamination of concrete surface layers, structural defects, use of low-grade concrete and defective materials, low This is caused by construction quality, increase in vehicle traffic, increase in vehicle load, speeding up of trains, and repeated running vibration exceeding the design value. It is analyzed that the main causes are accumulation of overload and repetitive load of the structure, chemical change due to salt and pollutants in the air, and the like.

[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 arranged in one direction on one surface of a mesh-reinforced reinforcing fiber support which is impregnated with a thermoplastic resin and dried, and is uniformly adjusted. (2) A technical means of covering the reinforcing fiber support, heating and pressurizing and fusing was adopted.

According to the second aspect of the present invention, the first reinforcing fibers and the second reinforcing fibers are simultaneously arranged in one direction on both sides of a mesh-reinforced reinforcing fiber support impregnated with a thermoplastic resin and dried. In addition, a technical means of fusing after adjusting the flatness is adopted.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described. The present invention provides a unidirectionally reinforced fiber support made of a net fabric reinforced with a thermoplastic resin which is impregnated with a thermoplastic resin and dried, or a reinforcing fiber support made of a net fabric made of a thermoplastic resin. The present invention provides a reinforcing fiber sheet for repairing / reinforcing concrete structures, which is heated, pressed and fused after being arranged uniformly and flatly.

[0011] The present invention provides a reinforcing material having excellent resistance to the upper surface of a lower reinforcing fiber support made of a net fabric or a net fabric made of a thermoplastic fiber which is impregnated with a thermoplastic resin and dried by impregnation with a thermoplastic resin. An upper reinforced fiber support made of a net fabric and a net fabric made of a thermoplastic fiber, in which fibers are arranged in one direction, are uniformly and flatly adjusted, have excellent resistance on the reinforcing fibers, and are impregnated with a thermoplastic resin and dried. Provided is a reinforcing fiber sheet for repair / reinforcement of a concrete structure in which a reinforcing fiber support is placed and heated and pressed to fuse the concrete structure.

Next, the present invention provides a reinforced fiber support made of a net fabric, which is impregnated with a thermoplastic resin and dried by drying, or a reinforced fiber support made of a net fabric made of a thermoplastic fiber. A reinforcing fiber sheet for repair / reinforcement of a concrete structure, which is arranged in one direction, uniformly and flatly adjusted, and then heated and pressed to be fused.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to FIG. FIG. 3A shows a reinforcing fiber sheet in which reinforcing fibers 11 having excellent reinforcing properties are fused to a flat surface of a reinforcing fiber support 10 which is impregnated with thermoplastic resin and dried. The reinforcing fiber support 10 is made by impregnating a thermoplastic resin with an organic fiber or a thermoplastic fiber having excellent resistance, such as a carbon fiber, a glass fiber, a Kevlar fiber, and an aramid fiber, and drying the resin or a thermoplastic fiber mesh. It is a woven fabric, which is organized biaxially or triaxially.

As shown in FIG. 4A, this reinforcing fiber sheet simultaneously draws out a reinforcing fiber support 10 in the form of a roll and a large number of bundles of reinforcing fibers 11 and passes between the pressing rolls 14 to arrange the reinforcing fibers 11 in the same direction. Adjust evenly and flatly. Next, the sheet is passed through a heater 15 that emits a reference amount of heat for fusing, and is then passed through a joining roll 16 and solidified to obtain a reinforcing fiber sheet as described above. After the fusion, the deformed paper 17 is adhered to the back surface of the reinforcing fiber support 10 to safely protect the bonding surface bonded to the surface of the concrete structure from foreign substances.

FIG. 3B relates to another embodiment of the present invention. As shown in FIG. 4A, this reinforcing fiber sheet has a roll-shaped lower reinforcing fiber support 10 in which a large number of bundles of reinforcing fibers 11 and an upper reinforcing fiber support. At the same time, the body 12 is fed out and passed at one time between the pressing rolls 14 so that the reinforcing fibers 11 are arranged in the same direction, and at the same time, are adjusted to be uniform and flat. Then, the reinforcing fiber sheet as described above can be obtained by passing the heater 15 and the joining roll 16 in order and fusing them. After the fusion, the modified paper 17 is adhered to the back surfaces of the reinforcing fiber supports 10 on both sides.

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

In any of the above-mentioned embodiments, the internal structures of the reinforcing fiber supports 10, 12 and the reinforcing fibers 11, 13 all remain in a non-curable, non-adhesive state. When a resin is applied, it is a ground to quickly and uniformly and completely penetrate between the reinforcing fiber yarns to exert a strong adhesive force. In each figure of FIG.
3 is shown as a horizontal ellipse, which is an imaginary state in which the cross section, which was initially circular, has been changed by being pressed down during pressing.

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

As described above, according to the present invention, the resin (A type) previously impregnated into the reinforcing fiber sheet and the liquid resin (B)
Liquid coating resin (B)
Adhesion of the reinforcing fiber sheet using only shape). The liquid resin for room temperature curing is a reinforcing fiber support 10 or 10, 12,
After quickly penetrating into the reinforcing fibers 11 or 11 and 13, they are adhered 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 wrapped around a reinforcing fiber support, the surface portion thereof is melted by heat to obtain a reinforcing fiber sheet. In the final stage,
The obtained reinforcing fiber sheet 4 is dry and flexible.

[0021]

According to the present invention, as a result of employing the above configuration,
The following effects can be obtained. (1) Compared to conventional reinforced fiber sheets bonded with thermosetting resin, handling, workability, transportability, deployability, workability,
It surpasses the sheet bonded with the conventional thermosetting resin in storage property and the like. In addition, because of its excellent flexibility, it is extremely easy to surround the surface of a horizontal beam or the like of a concrete structure or the like requiring repair or reinforcement work.

(2) The problem of impregnation with an adhesive resin for the reinforcing fiber support to have bonding properties is completely solved. In addition, after the repair / reinforcement is performed, the adhesiveness to the concrete structure by the liquid resin for room temperature curing is excellent, the peeling phenomenon of the reinforcing fiber sheet is suppressed as much as possible, and a completely integrated composite concrete repair / reinforcement structure Can be obtained.
In addition, highly accurate repair / reinforcement work can be performed within a short time.

[Brief description of the drawings]

FIG. 1 is an exemplary view of a conventional method of reinforcing a concrete structure requiring repair or reinforcement with an iron plate, reinforcing fibers, and carbon fibers.

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

FIG. 3 is a cross-sectional view of a reinforcing fiber sheet for repair / reinforcement of a concrete structure according to the present invention, wherein A is a single-sided support structure, B is a double-sided support structure, and C is a structure of a double-sided reinforcing fiber. FIG.

FIGS. 4A, 4B, and 4C are front views schematically showing the 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 reinforcing Fiber 14 ‥‥ Pressure roll 15 ‥‥ Heater 16 ‥‥ Joining roll 17 ‥‥ Profile paper

──────────────────────────────────────────────────の Continuing on the front page (51) Int.Cl. ⁶ Identification code FI B29K 105: 08 (72) Inventor Jeong Yi-soo South Korea Gyeongsangnam-do Gyeongsangnam-do Gyeongsang-dong Hallong-dong Datong Central apartment 103 building No. 1603 No. 1603 (56) Reference Document JP-A-9-132852 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B32B 1/00-35/00

Claims (3)

(57) [Claims] 1. A reinforcing fiber support made of a net fabric, which is impregnated with a thermoplastic resin and dried, and the reinforcing fibers are arranged in one direction on one side and uniformly adjusted, and then the second reinforcing fiber support is placed on the reinforcing fibers. A method for producing a reinforcing fiber sheet for repair / reinforcement of a concrete structure, characterized in that the body is covered, heated, pressed and fused. 2. After the first reinforcing fibers and the second reinforcing fibers are simultaneously arranged in one direction on both sides of a web-reinforced reinforcing fiber support impregnated with a thermoplastic resin and dried, and adjusted uniformly and flatly, A method for producing a reinforcing fiber sheet for repair / reinforcement of a concrete structure, which is characterized by fusing. 3. The reinforcing fiber support is a net fabric obtained by impregnating a thermoplastic resin with a biaxial or triaxial net fabric of an organic fiber such as glass fiber, carbon fiber, aramid fiber, vinylon, and Kevlar, and drying the resultant. 3. The method for producing a reinforcing fiber sheet for repairing and reinforcing concrete structures according to claim 1 or 2.