JP2002097746A - Frp reinforced materials with anchorage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such FRP reinforced materials with anchorage device that are not only light in weight, good in anti-corrosiveness, have high tensile strength and also its anchorage devices have a high drawing proof stress and yet its junction is easy, and that can promote a flexural force by fixing them to a face where tensile stress of beams and slabs made of reinforced concrete or pre-stressed concrete bridges works. SOLUTION: Each edge of fiber reinforced plastics member 2 is made into a rugged shape at its surface and which is inserted into the hole part 4 of the anchoring tool 3. Thereafter, in the gap of the holed part 4 of the anchoring tool 3, the filler materials are charged, and thereby at the both edges of the textile reinforced plastics member the anchoring tool 3 is integrally fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FRP reinforcing member with a fixing device in which fixing devices are integrally attached to both ends of a fiber-reinforced plastic member having a plate shape or a rod shape.

[0002]

2. Description of the Related Art As a method of reinforcing a concrete structure,
2. Description of the Related Art In recent years, an adhesive method for attaching or winding a continuous fiber sheet to the surface of an existing or new structure has been developed.

[0003] However, the above-mentioned bonding method is only simple bonding, and there is a limit to the improvement of the effect of reinforcing the ultimate strength due to the early destruction of the structure due to FRP peeling. The suppression effect is limited. In addition, the high performance of FRP reinforcement is not being used effectively.

In order to improve such a problem, a tension bonding method using an FRP sheet has been proposed.

FIG. 6 shows an example in which a bridge is reinforced using a FRP sheet 100 by a tension bonding method. In this example, a mode is shown in which prestress (tension) is introduced into the FRP sheet 100 which is a carbon fiber reinforced sheet, and the FRP sheet 100 is bonded to the upper part of the bridge.

The reinforcing method using such a tension bonding method can be expected to (1) have an effect of closing cracks. (2) The effect of generating a positive bending moment on the intermediate fulcrum can be expected. (3) Reinforcement can be made without substantially impairing the original shape. It has such advantages.

[0007]

However, the conventional FRP sheet 100 employed in the above-described tension bonding method is
At both ends of the sheet-like carbon fiber reinforced plastic sheet,
It was fixed to a metal or plastic plate-like fixing device 102 with an adhesive, and the tension introduced into the FRP sheet 100 was governed by the strength of the adhesive, and a large pull-out strength could not be obtained.

For example, as described in Japanese Patent Application Laid-Open No. 5-18109, a method has been proposed in which a reinforcing material is fixed by filling expandable cement inside a cylindrical fixing device. However, there was a drawback that the thickness became thicker.

Accordingly, an object of the present invention is to provide a bridge or building structure made of reinforced concrete or prestressed concrete, which is lightweight, has excellent corrosion resistance, has a high tensile strength, and has a high pull-out resistance of a fixing tool and is easily joined. An object of the present invention is to provide an FRP reinforcing member with a fixing tool, which can improve bending strength by fixing to a tensile stress acting surface such as a beam or a slab.

Another object of the present invention is to provide a suspension cable for a cable-stayed bridge, which is lightweight, has excellent corrosion resistance, has a high tensile strength, has a high pull-out resistance of a fixing device, and can be easily joined. Another object of the present invention is to provide an FRP reinforcing material with a fixing tool that can be used as a tension material for prestressed concrete.

[0011]

The above object is achieved by the FRP reinforcing material with a fixing device according to the present invention. In summary,
The present invention is an FRP reinforcing material in which a fixing device is integrally attached to both ends of a fiber-reinforced plastic member, wherein the fixing device includes:
The fiber reinforced plastic member includes holes for receiving the ends, and each end of the fiber reinforced plastic member has an uneven surface, and is inserted into the hole of the fixing device, and then the fixing is performed. An FRP reinforcing member with a fixing tool, wherein the fixing tool is integrally attached to both ends of the fiber-reinforced plastic member by filling a gap in a hole of the tool with a filler.

According to one embodiment of the present invention, the irregular shape of the end surface of the fiber reinforced plastic member is obtained by applying an adhesive to the end surface of the fiber reinforced plastic member and spraying a granular material thereon. Formed by bonding. According to another embodiment, the uneven shape of the end surface of the fiber-reinforced plastic member is formed by winding a reinforcing fiber around the end surface of the fiber-reinforced plastic member and bonding the reinforcing fiber to the surface with an adhesive. You.

According to another embodiment of the present invention, the fiber reinforced plastic member has a plate shape or a rod shape.

According to another embodiment of the present invention, the fixing device has a circular, elliptical or rectangular cross section, or a combination thereof. According to another embodiment,
The fixing device is made of metal. According to another embodiment, the fixing device has a mounting member integrally formed.

According to another embodiment of the present invention, the fiber-reinforced plastic member is obtained by impregnating a resin into a reinforcing fiber and curing the resin. The reinforcing fiber may be a PAN-based or pitch-based carbon fiber, a glass fiber, Alternatively, one kind or a mixture of plural kinds of organic fibers such as aramid, nylon, polyester, and PBO is used, and the resin is a thermosetting resin. According to one embodiment, the thermosetting resin comprises:
A room temperature or thermosetting epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol resin.

According to another embodiment of the present invention, the filler is an adhesive or an expandable grout.

According to another embodiment of the present invention, the adhesive is an epoxy-based adhesive.

According to another embodiment of the present invention, the expandable grout material is a hydraulic high-strength grout;
The granular material is silica sand or crushed stone having a particle size of 0.1 mm to 5 mm.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an F with a fixing device according to the present invention will be described.
The RP reinforcement will be described in more detail with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the FRP reinforcing member 1 with a fixing device according to the present invention. According to this embodiment,
The FRP reinforcing member 1 with a fixing device includes a fiber-reinforced plastic member 2 and a fixing device 3 integrally attached to both ends of the fiber-reinforced plastic member 2.

The fixing device 3 has a hole 4 for inserting and holding an end of the fiber reinforced plastic 2. 3A, 3B, 3C, and 3C.
As illustrated in (D) and (E), the shape may be a circle, an ellipse, a rectangle, or a combination of these shapes. The cross-sectional shape of the fixing device 1 is not limited to this, and may be various other shapes.

In this embodiment, a fixing device 6 having a bolt hole 5 is integrally formed at an outer end portion of the fixing device 1 so as to protrude outward. The FRP reinforcing material 1 with the fixing device is configured such that tension is introduced into the fiber-reinforced plastic member 2 by using the mounting device 6 or the bolt holes 5 of the mounting device 6 are used.
The FRP reinforcing member 1 with the fixing tool can be fixed to the reinforcing portion by using an anchor bolt (not shown). The attachment 6 can be provided at any position of the fixing tool 1,
For example, as shown in FIG. 4, it is also possible to attach them on both sides of the fixing device 3.

The fixing device 3 and the mounting device 6 are preferably made of a metal such as steel (steel material).
It can be made of other metals, and if necessary, it can be made of a material other than metal such as plastic or fiber reinforced plastic.

The fiber reinforced plastic member 2 is shown in FIG.
As shown in (A) to (D), the resin 2b is added to the reinforcing fiber 2a.
And hardened, and may be in the form of a plate (including a sheet, a tape, or a string) or a rod. Further, the reinforcing fibers 2a can be unidirectionally arrayed reinforcing fibers arranged in one direction along the longitudinal direction of the fiber-reinforced plastic member 2, that is, along the tension introduction direction. Can also be used. In the present embodiment, the reinforcing fibers arranged in one direction were used, and the sheet was formed into a rectangular sheet having a width of 50 mm, a thickness of 2 mm, and a length of 2 m.

The reinforcing fibers 2 of the fiber-reinforced plastic member 2
a is a PAN-based or pitch-based carbon fiber, glass fiber,
Alternatively, organic fibers such as aramid, nylon, polyester, and PBO may be used alone or in combination of two or more. The resin 2b impregnated in the reinforcing fibers 2a is a thermosetting resin. As the thermosetting resin, a room temperature or thermosetting epoxy resin, vinyl ester resin, M
MA resin, unsaturated polyester resin, or phenol resin.

The resin impregnation amount in the fiber reinforced plastic member 2, that is, the fiber ratio Vf defined by the following equation is 10
９９99.9%, preferably 40-70%, usually 60%
Degree. Fiber ratio Vf (%) = (total volume of fiber) / (total volume of resin + total volume of fiber) The end of the fiber reinforced plastic member 2 produced as described above has an uneven surface. You. Such an uneven surface can be formed, for example, by applying an adhesive 10 to the end surface of the fiber-reinforced plastic member 2 and spraying the granular material 11 thereon, as shown in FIG.
Thereby, the coefficient of friction at the end of the fiber reinforced plastic member can be increased.

As the adhesive 10, for example, any adhesive such as an epoxy adhesive can be used, but it is preferable to use an adhesive having good compatibility with the resin 2b used for the fiber reinforced plastic 2.

The particle 11 has a particle size of 0.1 mm to
Quartz sand or crushed stone of 5 mm is preferred.

As shown in FIG. 5, for example, as shown in FIG. 5, a string-shaped fiber reinforced plastic 11 is wound around the end surface of the fiber reinforced plastic member 2, and It can also be formed by adhering to the end surface of the fiber reinforced plastic member 1 with the adhesive 10 applied to the end surface of the fiber reinforced plastic 11 or the fiber reinforced plastic member 2.

After the granular material such as silica sand or the string-like fiber reinforced plastic 11 is fixed to the end of the fiber reinforced plastic member 2, the end of the fiber reinforced plastic member 2 is inserted into the hole 4 of the fixing device 3. And insert the filler 1 into the space of the hole 4.
2 are filled. As the filler 12, an adhesive or an expandable grout material can be suitably used. The same adhesive as that used for bonding the silica sand 11 to the end of the fiber-reinforced plastic member 2 may be used, but another adhesive may be used.

As the expandable grout material 12, a quick-setting and relatively high-strength general mortar may be used, but a fast-setting and expandable hydraulic high-strength grout material is preferable. The high-strength grout material 12 is solidified with high strength by expansion and hardening while uniformly compressing the inner surface of the hole of the fixing device and the peripheral surface of the fiber-reinforced plastic with a high internal pressure.

Examples of the grout material include a cement paste comprising portland cement, calcium aluminate, gypsum, an expandable cement admixture, a setting retarder, and a high-performance water reducing agent, or a mortar obtained by adding fine sand to this paste. Is used.

Therefore, both ends of the fiber reinforced plastic member 2 are completely connected to the filler 12, for example, a high-strength compacted grout in a compressed state in which an internal pressure is generated in the hole of the fixing device, via the uneven surface. The FRP reinforcing member 1 with the fixing tool is thus manufactured.

The FRP reinforcing material 1 according to the present invention is provided between the fixing device 3 and the fiber-reinforced plastic member 2.
Thus, it is possible to obtain a fixing force that can sufficiently oppose the tensile force applied for introducing the tension into the wire. Therefore, the fixing device 3
High fixing strength can be obtained irrespective of the shape.

The FR with the fixing device of the present invention having such a structure
The P reinforcing material 1 is lightweight, has excellent corrosion resistance, has high tensile strength, and has high pull-out strength of the fixing device and is easy to join. Therefore, it can be used as a high-strength reinforcing material or a tension material. For example, the bending strength can be improved by fixing the reinforcing material to a tensile stress acting surface of a member such as a reinforced concrete or prestressed concrete beam or slab of a bridge or a building structure. It can be used as a suspension cable for a cable-stayed bridge, or as a tendon for prestressed concrete.

Next, the FRP reinforcing material with a fixing device according to the present invention will be described in more detail with reference to examples.

In the present embodiment, the fiber-reinforced plastic member 2 has carbon fibers 2a arranged in one direction,
This was a carbon fiber reinforced plastic impregnated with b and cured. The resin impregnation amount at this time was 40%.

The properties of the carbon fibers used were as follows. -Properties of carbon fiber: Young's modulus 230 GPa Tensile strength 4900 MPa An adhesive 10 was applied to both ends of the carbon fiber reinforced plastic member 2 thus produced, and silica sand 11 was sprayed thereon. The adhesive 10 was an epoxy adhesive (trade name: FR-E3P, manufactured by Nippon Steel Composite Co., Ltd.), and the particle size of the silica sand 11 was 1 mm to 5 mm. Silica sand 11
Sprayed at 5 kg / m ² .

After the silica sand 11 was fixed to the end of the fiber reinforced plastic member 2, the end of the fiber reinforced plastic member 2 was inserted into the hole 4 of the steel cylindrical fixing device 3 having an inner diameter of 55 mm. Thereafter, the voids in the holes 4 were filled with an inflatable mortar 12 as a grout material, and the ends of the fiber-reinforced plastic member were fixed to the fixing device 3. The properties of the expandable mortar 12 were as follows. And properties of the intumescent Mortar: was subjected to a tensile fixed to standard inflation pressure 30 N / mm ² true specific gravity 3.20 In this manner the fixture with FRP both ends of the reinforcing member 1 tensile tester manufactured tested. Tensile force 2
At 50 kN, the carbon fiber reinforced plastic member 2 breaks,
The carbon fiber reinforced plastic member 2 did not fall out of the fixing device 3.

An FRP reinforcing member 1 having the same structure as described above was manufactured by changing the cross-sectional shape of the fixing device 3 into an elliptical shape and a rectangular shape, and the same test was performed. It was broken and the end of the carbon fiber reinforced plastic member 2 did not fall out of the fixing device 3.

As a comparative example, the end of the fiber-reinforced plastic member 2 was not sprayed with the adhesive 10 and the silica sand 11 and the end of the fiber-reinforced plastic member was cut into the hole 4 of the steel cylindrical fixing device 3 having an inner diameter of 55 mm. Then, the mortar 12 was filled in the space of the hole 4 and fixed.

A tensile test was performed by fixing both ends of the FRP reinforcing material with a fixture as a comparative example manufactured as described above to a tensile tester. With a tensile force of 250 kN, the carbon fiber reinforced plastic member 2 came out of the fixing device 3.

[0043]

As described above, the FRP reinforcing material with a fixing device according to the present invention is an FRP reinforcing material in which a fixing device is integrally attached to both ends of a fiber-reinforced plastic member. A hole for receiving an end of the plastic member is provided. Each end of the fiber-reinforced plastic member has an uneven surface, and is inserted into the hole of the fixing device. Since the fixing device is integrally attached to both ends of the fiber reinforced plastic member by filling the material with the filler, (1) it is lightweight, has excellent corrosion resistance, has high tensile strength, and has a high tensile strength. Bending strength can be improved by fixing to a tensile stress acting surface such as a reinforced concrete or prestressed concrete beam or slab of a bridge or a building structure having a high pull-out strength and easy joining. (2) It is lightweight, has excellent corrosion resistance, has high tensile strength, and has a high pull-out strength of the fixing device, and is easy to join. Can be used.

[Brief description of the drawings]

FIG. 1 is a sectional side view of an FRP reinforcing member with a fixing tool according to the present invention.

FIG. 2 is a sectional plan view of an FRP reinforcing member with a fixing device according to the present invention.

FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, showing an embodiment of the fixing device.

FIG. 4 is a plan view showing another embodiment of the FRP reinforcing material with a fixing tool according to the present invention.

FIG. 5 is a perspective view showing another embodiment of the end surface unevenness of the fiber reinforced plastic member in the FRP reinforcing material with a fixing device according to the present invention.

FIG. 6 is a diagram illustrating a tension bonding method for an upper part of a bridge using an FRP sheet.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 FRP reinforcing material with fixing device 2 Fiber reinforced plastic member 3 Fixing device 10 Adhesive 11 Uneven surface (granular material, fiber reinforced plastic) 12 Filler

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Joe Hamada 1-16-6 Kita-Otsuka, Toshima-ku, Tokyo DOPI Construction Industry Co., Ltd. (72) Inventor Takayuki Kojima 3-10 Kurakuen, Nishinomiya City, Hyogo Prefecture ( 72) Inventor Noriaki Takagi 943, Noji-cho, Kusatsu-shi, Shiga 907 Suncourt Minami-Kusatsu 907 (72) Inventor Kazuhiro Kuzume 1-7-7, Nishihonmachi, Nishi-ku, Osaka-shi, Osaka Inside the International Construction Technology Research Institute (72) Inventor Akira Kobayashi F-term (reference) 2D059 AA14 GG01 GG02 GG40 GG55 2E164 AA05 BA06 BA12

Claims (13)

[Claims] 1. An FRP reinforcing material having a fixing device integrally attached to both ends of a fiber-reinforced plastic member, wherein the fixing device has a hole for receiving an end of the fiber-reinforced plastic member, Each end of the plastic member has an uneven surface, and is inserted into the hole of the fixing device, and thereafter, a filler is filled in a void of the hole of the fixing device, thereby forming the fiber-reinforced plastic. FR with fixing device, wherein the fixing device is integrally attached to both ends of a member
P reinforcement. 2. The uneven shape of the end surface of the fiber reinforced plastic member is formed by applying an adhesive to the end surface of the fiber reinforced plastic member and spraying and adhering a granular material thereon. 2. The method according to claim 1, wherein
FRP reinforcement with fixing device. 3. The uneven shape of the end surface of the fiber reinforced plastic member is formed by winding a reinforcing fiber around the end surface of the fiber reinforced plastic member and bonding the reinforcing fiber to the surface with an adhesive. The FRP reinforcing material with a fixing tool according to claim 1. 4. The FRP reinforcing member with a fixing device according to claim 1, wherein the fiber reinforced plastic member is formed in a plate shape or a rod shape. 5. The fixing device according to claim 1, wherein the fixing device has a circular, elliptical, or rectangular cross section, or a combination of these shapes. With FRP reinforcement. 6. The FRP with a fixing device according to claim 1, wherein the fixing device is made of metal, plastic, or fiber-reinforced plastic.
Reinforcement. 7. The FRP reinforcing material with a fixing device according to claim 1, wherein the fixing device is formed integrally with a mounting device. 8. The fiber-reinforced plastic member is obtained by impregnating a reinforcing fiber with a resin and curing the resin, wherein the reinforcing fiber is a PAN-based or pitch-based carbon fiber, a glass fiber,
Or, one kind of organic fiber such as aramid, nylon, polyester, PBO, or a mixture of plural kinds is used, and the resin is a thermosetting resin. The FRP reinforcing material with a fixing device according to item 6. 9. The thermosetting resin may be a room temperature curing type or a thermosetting type epoxy resin, a vinyl ester resin, MMA.
The FRP reinforcing material with a fixing device according to claim 8, wherein the FRP reinforcing material is a resin, an unsaturated polyester resin, or a phenol resin. 10. The FRP reinforcing material with a fixing tool according to claim 1, wherein the filler is an adhesive or an expandable grout material. 11. The FRP reinforcing material with a fixing device according to claim 10, wherein the adhesive is an epoxy adhesive. 12. The FRP reinforcing material with a fixing device according to claim 10, wherein the expandable grout material is hydraulic high strength grout. 13. The granular material has a particle size of 0.1 mm to 5 mm.
2. The material is silica sand or crushed stone having a thickness of 1 mm.
The FRP reinforcing material with a fixing device according to any one of Items 10 to 10.