JP2002295024A - Reinforcing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing plate capable of easily ensuring an uniform high adhesive strength with a surface finishing member without requiring a skilled work or cleaning work in the surface finishing of a FRP-made reinforcing plate with mortar or the like. SOLUTION: This reinforcing plate is formed of a FRP plate having an irregular surface formed one side thereof, a FRP plate having a resin layer having an irregular surface on one side thereof, a FRP plate having a cloth having fluffing texture on the surface on one side thereof, or a FRP plate having one side roughened by adhering siliceous particle to the one side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing plate made of FRP (fiber reinforced plastic), and more particularly to a reinforcing plate suitable for reinforcing concrete structures and the like, which can be easily finished with a mortar after reinforcement. About.

[0002]

2. Description of the Related Art Conventionally, carbon fiber, aramid fiber, glass fiber, etc., have been used for reinforcing slabs, piers, building columns, beams and the like of reinforced concrete structures and steel-frame reinforced concrete structures for seismic reinforcement and strength deterioration. FRP using functional fiber
A reinforcing plate composed of a strip made of steel is adhered to the surface of the structure with an adhesive and reinforced. After attaching these reinforcing plates, mortar may be applied to improve the finish and fire resistance / fire resistance.However, since the reinforcing plates are finished to a flat outer surface, the mortar is directly applied to the outer surface. Cannot secure the adhesive strength. In order to secure the adhesive strength between the outer surface of the reinforcing plate and the mortar, apply an adhesive such as epoxy resin to the outer surface where the mortar is attached after attaching it to the concrete structure, and before the adhesive cures Sprinkling silica sand or embedding one side of the three-dimensional brushed net in the adhesive, and then applying the mortar after curing the adhesive. In other words, the mortar is entangled with the silica sand coming out of the surface of the adhesive or the raised portion of the three-dimensional raised net to secure the adhesive strength.

[0003]

However, in the above-mentioned conventional method, after the reinforcing plate is attached, it is necessary to further apply an adhesive and spray silica sand or a net. A curing period of about one week is required, which contributes to a longer overall process. Also,
In the case of silica sand, the worker sprinkles by hand, so sprinkling unevenness is likely to occur, and in the case of nets, the worker uses a roller hook when embedding one side into the adhesive, but depending on the skill of the worker, the brushed part The adhesive also adheres to
In either case, uneven bonding strength with the mortar occurs. Furthermore, in the case of silica sand, about half of the sprinkled silica sand does not adhere to the adhesive and falls to the floor, etc.,
Cleaning is required.

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the object of the present invention is to provide an FRP reinforcing plate with a mortar or the like without the need for skilled work or cleaning work. An object of the present invention is to provide a reinforcing plate which can easily secure a uniform high adhesive strength.

[0005]

In order to solve the above-mentioned problems, a reinforcing plate according to the present invention is formed by forming one surface of an FRP plate on an uneven surface. That is, one surface of the FRP plate is directly provided with irregularities.

[0006] The reinforcing plate according to the present invention is formed by forming a resin layer having an uneven surface on one surface of an FRP plate.

The reinforcing plate according to the present invention is formed by joining a fabric having a raised structure on one surface to one surface of an FRP plate.

Further, the reinforcing plate according to the present invention is formed by roughening one surface of the FRP plate by attaching siliceous particles to one surface thereof.

When a concrete structure or the like is reinforced by using such a reinforcing plate according to the present invention, the outer surface of the reinforcing plate can be directly or resin-coated at the stage where the reinforcing plate is attached to the structure. It is formed on the uneven surface, formed by the raised structure of the fabric, or formed on the rough surface by the siliceous particles attached thereto. Therefore, the mortar or the like can be directly bonded to the outer surface without any pretreatment, and a high adhesive strength with the mortar or the like is secured by the uneven surface, the napped structure, and the rough surface. In addition, since the uneven surface, the raised structure, and the rough surface are formed in advance before reinforcement by the reinforcing plate, they have a uniform shape, and therefore have a uniform adhesive strength with mortar or the like. In addition, since there is no need to apply an adhesive or sprinkle with silica sand, there is no problem regarding the skill of the operator, and cleaning work of silica sand that has fallen without adhering becomes unnecessary. As a result, for the reinforcement part,
The desired surface finish is very easily achieved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail. The reinforcing plate according to the present invention,
For example, it is formed in the shape of a strip-shaped plate, and one surface of the FRP plate constituting the reinforcing plate is formed directly on the uneven surface. The unevenness can be provided in the FRP molding step, or can be provided directly on the surface of the cured FRP plate.

The provision of the irregularities in the FRP molding step can be performed, for example, as follows. The FRP board used as a substrate in the present invention is usually formed by laminating and molding one or several unidirectional prepregs. In the step of laminating the one-way prepreg and curing and molding the resin while applying heat and pressure, molding is performed using a press device having an arbitrary emboss pattern, whereby desired irregularities can be imparted.

In the case where irregularities are directly provided on the surface of the cured FRP plate, for example, it can be performed as follows. That is, the surface of the FRP plate is directly subjected to unevenness processing by a method such as surface abrasion, grinding, sand plast, laser light irradiation, plasma treatment, etching treatment using various chemical treatment agents such as oxidation treatment, hydrolysis treatment and the like. Can be.

Further, another reinforcing plate according to the present invention is characterized in that an uneven structure is formed by at least one outer surface resin layer of the reinforcing plate. By forming the uneven surface, it is possible to increase the surface area related to the adhesion between the uneven surface of the reinforcing plate and the mortar, and it is possible to stabilize the bonding at the interface between the reinforcing plate and the mortar by the anchor effect. The concavo-convex structure for promoting the permeability of the mortar may be a regular structure or a random structure.

As means for providing such an uneven structure, for example, the following can be employed. In order to form the grooves on the surface, a mechanical processing method such as abrasion or grinding, or a method of randomly roughening the surface with a sandplast using, for example, gold sand can be employed. In addition, a physical method using a laser beam or plasma irradiation, an etching method using a chemical corrosive, or the like can also be adopted.

In order to impart unevenness to the resin in a semi-cured state, there is a method such as an embossing press treatment. The treatment can be carried out at room temperature or, if necessary, in a heated state. Such unevenness treatment may be performed on the entire surface of the resin layer,
It may be applied partially.

In the case where the surface of the FRP plate is formed directly on the uneven surface, and when the uneven surface is formed on the resin layer on one surface of the FRP plate, the uneven surface has a depth of 0.3 mm to 2 m.
It can be composed of a groove having a width of about m and a width of about 0.2 mm to 3 mm. Various shapes such as a V-shape, a semicircle, and a rectangle can be applied to the cross-sectional shape of the groove. As for the width of the groove, the wider the width on the back side than the width of the frontage, the more stable the adhesiveness due to the anchor effect.

Preferably, not only one groove but also a plurality of grooves are formed. The grooves may be straight or curved. The plurality of grooves may be parallel to each other or may be arranged randomly.

In the case where the unevenness is formed by roughening the surface or forming a groove as described above, for example, when the unevenness is formed on the surface of the resin layer, the resin layer is applied to the surface of the reinforcing plate, and the resin layer is cut in half. When in a cured or cured state,
What is necessary is just to give unevenness to a resin layer. The type of the resin forming the resin layer is not particularly limited, but preferably has an affinity with the FRP reinforcing plate and the mortar. Examples of the polymer serving as the main component of such a resin layer include vinyl polymers, acrylic polymers, rubber polymers, urethane polymers, epoxy polymers, modified silicon polymers, and polysulfide polymers. Although various things can be used, it is not limited to these.

Further, as another means for forming the concavo-convex structure in the present invention, it is also possible to form a napped structure by bonding a cloth to one surface of the FRP plate. As a specific method for forming the nap structure, a method in which a cloth having the nap structure is attached to the surface with an adhesive or the like, or a method in which the short fibers are oriented substantially perpendicular to the outer surface by a method such as electroplanting is used. It can also be arranged as follows. The former method is preferable to prevent the standing hair from falling off during construction. A woven fabric, a knitted fabric, a non-woven fabric, or the like can be used as the napped fabric to be attached to the surface of the reinforcing plate.

A preferred method of forming naps in a woven or knitted fabric is to use, for example, a velvet woven fabric or a tricot knitted fabric by a known weaving machine or knitting machine using the same or different fibers for the warp and weft yarns. Thus, a woven or knitted fabric having a napped structure can be obtained. According to these methods, the nap is formed in a direction perpendicular to the plane constituting the woven or knitted fabric. In the case of a non-woven fabric other than a woven or knitted fabric, a nap can also be formed by subjecting the surface to a rubbing treatment or the like.

The nap is preferably formed on at least one of the front and back surfaces of the fabric. The shape of the nap is straight,
There are a loop shape and a hook shape. For stabilizing the adhesion of mortar or the like, a loop shape or a hook shape is preferable.

Considering the permeability of the mortar and the stability at the adhesive interface, the length of the nap is preferably about 1 mm to 5 mm. More preferably, about 2 mm to 4 mm is appropriate. 10,000 for the density of the napped / m ² to 30 million units /
m ² about is good.

The structure and density of the base fabric of the woven or knitted fabric constituting these raised fabrics are not particularly limited.

It is preferable that the nap fibers have an affinity with an adhesive or a finished cement mortar. Examples of such materials include polyolefins, polyesters, polyamides, polyvinyl alcohols and partially modified polymers. , Polyvinyl acetate, acrylic derivatives and the like. More preferably, a polyamide, polyvinyl alcohol, a partially modified polymer thereof, or polyvinyl acetate is used. It is also possible to partially modify the polymer if necessary.

There is also a method in which particles made of a material having an affinity for mortar are fixed to the outer surface of the reinforcing plate. As a fixing method, it can be fixed via an adhesive material such as an adhesive or an adhesive tape. As particles of a material having an affinity for mortar, for example, there are silicate particles that react with cement constituting the mortar, and such substances include crushed pieces of glass or ceramic tile, slag, micro silica, silica sand, and the like. There are substances. These may be used alone or may be used as a mixture as needed. In order to form the unevenness and to exert the anchor effect, those having a particle diameter of 0.1 mm to 3 mm can be preferably used. As the particle shape, amorphous particles, spherical particles and the like are used. In short, it is only necessary that the mortar can penetrate into the gaps between the particles and exhibit the anchor effect.

In order to adhere the particles to the surface of the reinforcing plate, a mixture obtained by kneading the resin having the adhesive property and the particles may be spray-painted using a tool such as a spray gun.
The mixing ratio of resin solids / particles is not particularly limited, but is preferably about 90/10 to 30/70 as a weight ratio. When the resin solid content exceeds 90% by weight, the uneven structure is hardly developed, and when it is less than 30% by weight, the particles easily fall off. The composition of the resin mixed with the particles is not particularly limited as long as the adhesiveness with the reinforcing plate and the affinity with the particles can be ensured.

Although the particle size distribution characteristics of the particles are not particularly limited, considering the filling characteristics of the particles on the FRP surface, the particle size range is 0.1 mm to 3 mm as described above.
mm is preferred. Note that the weight distribution of the particle group included in this range is preferably 95% or more.

Particles such as silica sand have a particle size distribution. Particle size distribution characteristics (a certain particle size and corresponding weight%
Of the particle when the cumulative weight from the finer one reaches 50% by weight, D (50
%) And the weight average particle diameter can be considered.
In the present invention, the weight average particle diameter of the particles for forming the uneven structure on the surface of the FRP plate is preferably in the range of 0.3 mm to 2 mm. Weight average particle size is 0.3mm
If it is smaller, the generated irregularities are small and the effect of the mortar affinity is small. Conversely, if it exceeds 2 mm, particles are likely to drop off from the surface.

By providing the unevenness structure in the reinforcing plate according to the present invention, the adhesion to the coating mortar can be improved.
Further, a material having mortar affinity can be applied to or contained in a portion in contact with the mortar.

Such a concavo-convex structure may be formed at a construction site, or may be constructed on a factory line using a strip-shaped plate that has been processed in advance into a concavo-convex structure.

In consideration of the simplicity of work and the stability and uniformity of adhesion to the mortar in the work, it is preferable to bring a reinforcing plate having a concavo-convex structure by pre-processing like the latter to the construction site and finish the construction. .

As the method of forming the uneven structure on the surface of the reinforcing plate, there are various methods such as a method of forming a groove, roughening, attaching a nap cloth, or fixing particles such as silica sand to the surface as described above. However, any method can be preferably used. In short, it is particularly preferable that the mortar has such a structure that it easily penetrates, and that the mortar that has penetrated hardly detaches by an anchoring action.

The reinforcing plate according to the present invention is preferably a material having flexibility so as to easily conform to the various three-dimensional shapes of the structure to be reinforced, and furthermore, an FRP plate which is easily processed to be uneven.

In order to exhibit a reinforcing effect, the FRP plate has a tensile strength of 500 to 4000 MPa and a tensile modulus of 50 to 4000 MPa.
Preferably it is 500 GPa. In order to maintain strength and elasticity while maintaining flexibility, the reinforcing plate is based on an FRP plate, but the type of reinforcing fibers and the type of matrix resin are not particularly limited.

[0035]

The present invention will be described in more detail by way of examples. Example 1 A linear projection having a height of 0.5 mm and a width of 0.3 mm was formed by 5 mm.
Pressing a press plate having a lattice shape at a pitch against one surface of a prepreg made of carbon fiber and epoxy resin, curing the resin while applying heat and pressure, having a groove on one surface,
A CFRP plate (carbon fiber reinforced plastic plate) having a thickness of 2 mm and a width of 10 cm was formed. The surface where the grooves were not formed was bonded to the columnar concrete structure using an epoxy adhesive. After curing the adhesive, a mortar for surface finishing was applied and cured. The mortar-applied surface after curing was good in finish without mortar lifting or peeling.

Example 2 As shown in FIGS. 1 and 2, the thickness was 2 mm and the width was 10 cm.
Strip of glass cloth reinforced phenolic resin plate
A resin layer 2 made of an epoxy-based adhesive is applied to one surface of the RP plate 1 to a thickness of 1 mm, and a linear groove 3 having a depth of 0.5 mm and a width of 0.3 mm is formed while the resin layer 2 is in a semi-cured state. 5mm
They were formed in a lattice at a pitch. The surface where the groove 3 was not formed was bonded to the columnar concrete structure using an epoxy adhesive. In addition, as shown in FIG. 3, the reinforcing plate 4 having the groove 3 formed thereon is wound so that the groove forming surface is on the inside, and transported in a packing form fixed with a band 5 to the construction site. It was unwound and cut to the required length. After curing the adhesive, a mortar for surface finishing was applied and cured. The mortar-applied surface after curing was good in finish without mortar lifting or peeling.

Example 3 As shown in FIGS. 4 and 5, the thickness was 2 mm and the width was 10 cm.
On one side surface of a belt-like FRP plate 11 made of a unidirectional glass fiber reinforced unsaturated polyester resin plate,
2, nap length 3 mm, nap density 110,000 pieces / m ²
Layer 13 made of an epoxy-based adhesive
4 to form a reinforcing plate 15. FRP
An epoxy adhesive was applied to the remaining surface of the plate 11 and bonded to the columnar concrete structure. After curing the adhesive, a mortar for surface finishing was applied and cured. The mortar-applied surface after curing was good in finish without mortar lifting or peeling. In addition, the same form as in the first embodiment can be adopted for packing and transporting the reinforcing plate 15.

Example 4 As shown in FIGS. 6 and 7, the thickness was 2 mm and the width was 10 cm.
An adhesive layer 22 made of an epoxy adhesive was thinly applied to one surface of an FRP plate 21 made of a unidirectional glass fiber reinforced unsaturated polyester resin plate. Particles of silica sand 23 mixed with 50 parts by weight of silica sand No. 3 and 50 parts by weight of silica sand No. 4 were sprayed while the adhesive was not completely cured, pressed with a roll, and then cured to form a reinforcing plate 24. On the other hand, an epoxy adhesive was applied to the remaining surface of the FRP plate 21 and bonded to the columnar concrete structure. After the adhesive was cured, the surface to which the silica sand was fixed was coated with a mortar for surface finishing and cured. The mortar-applied surface after curing was good in finish without mortar lifting or peeling. In addition, the same form as in the first embodiment can be adopted for packing and transporting the reinforcing plate 24.

[0039]

As described above, according to the reinforcing plate of the present invention, an uneven structure, a raised structure, a roughened structure made of silica sand or the like is formed on the outer surface of the reinforcing plate used for reinforcement. In addition, mortar or the like can be joined with high adhesive strength, and a desired surface finish can be easily performed without requiring a skillful operation.

[Brief description of the drawings]

FIG. 1 is a perspective view of a reinforcing plate according to a second embodiment of the present invention.

FIG. 2 is an enlarged partial longitudinal sectional view of the reinforcing plate of FIG.

FIG. 3 is a schematic side view showing a packing and transportation mode of the reinforcing plate of FIG. 1;

FIG. 4 is a perspective view of a reinforcing plate according to a third embodiment of the present invention.

FIG. 5 is an enlarged partial longitudinal sectional view of the reinforcing plate of FIG.

FIG. 6 is a perspective view of a reinforcing plate according to Embodiment 4 of the present invention.

FIG. 7 is an enlarged partial longitudinal sectional view of the reinforcing plate of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11, 21 FRP board 2 Resin layer 3 Groove 4, 15, 24 Reinforcement board 5 Band 12 Looped nap 13 Napped knit 14, 22 Adhesive layer 23 Silica sand

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2E176 AA01 BB29 4F100 AA20A AD11 AK01B AK53 BA02 BA03 BA07 BA10A BA10C BA41 DD01A DD01B DE01A DG16C DH02A EJ17 EJ172 EJ42 EJ422 GB07 JA13C JL02 YY00YYY00B

Claims (9)

[Claims] 1. A reinforcing plate in which one surface of an FRP plate is formed as an uneven surface. 2. A reinforcing plate in which a resin layer having an uneven surface is formed on one surface of an FRP plate. 3. The uneven surface according to claim 1, wherein the uneven surface is formed of a plurality of grooves having a depth in a range of 0.3 to 2 mm and a width in a range of 0.2 to 3 mm. The reinforcing plate according to the above. 4. A reinforcing plate obtained by joining a fabric having a raised structure on one surface to one surface of an FRP plate. 5. The reinforcing plate according to claim 4, wherein the nap tissue is constituted by loop-shaped nap. 6. The nap length is in the range of 1 to 5 mm,
The reinforcing plate according to claim 4, wherein the density is in a range of 10,000 to 300,000 / m ² . 7. A reinforcing plate having one surface roughened by attaching siliceous particles to one surface of the FRP plate. 8. The reinforcing plate according to claim 7, wherein the particle size of the siliceous particles is in the range of 0.1 to 3 mm. 9. The method according to claim 9, wherein the particle size is 0.3% in terms of weight average particle size.
9. The reinforcing plate according to claim 8, which is in the range of ~ 2 mm.