JP2007162322A - Method of reinforcing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of reinforcing a structure such as a concrete structure or a steel structure facilitating construction by reducing the use of a steel material, and anchoring reinforcing fiber sheets with lightweight structure. <P>SOLUTION: In the method of reinforcing the structure by sticking a plurality of reinforcing fiber sheets 1 to a sticking surface 101 of the structure 100 with an adhesive, the ends of the plurality of reinforcing fiber sheets 1 stuck to the sticking surface 101 of the structure 100 are separated into a plurality of layers in predetermined number from the reinforcing fiber sheet 1 on the opposite side to the sticking surface side of the concrete structure 100 to the reinforcing fiber sheet 1 on the sticking surface side, and the respective layer-separated ends in the predetermined number of the split reinforcing fiber sheets 1 are wound around a plurality of rod-like anchor bodies 20 arranged orthogonally to the longitudinal direction of the reinforcing fiber sheets in different positions along the longitudinal direction of the reinforcing fiber sheets 1, and bonded with an adhesive. The anchor bodies 20 are stuck to the structure 100 by fasteners. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a concrete structure such as a civil engineering structure using a reinforcing fiber sheet reinforcing material, or a steel structure (in the present specification, including a concrete structure and a steel structure, simply “structure”). In particular, the present invention relates to a method for reinforcing a structure characterized by a fixing method of an end portion of a reinforcing fiber sheet reinforcing material bonded to the structure.

  As a method for reinforcing a structure, in recent years, a bonding method has been developed in which one or a plurality of continuous reinforcing fiber sheets are bonded to the surface of an existing or new structure as a reinforcing fiber sheet reinforcing material.

  For example, when reinforcing a reinforcing fiber sheet reinforcing material by adhering it to a concrete structure, it is necessary to apply the reinforcing fiber sheet reinforcing material in consideration of the fixing length of the reinforcing fiber sheet reinforcing material from the range where the reinforcing is necessary in terms of design.

  However, when the fixing length cannot be secured, the end of the reinforcing fiber sheet reinforcing material is pressure-bonded with a steel material, and the steel material is fixed to a concrete structure with an anchor. FIG. 14 shows an example of a fixing method of the reinforcing fiber sheet reinforcing material 10 in the case where the concrete beam 100 currently used is bent and reinforced with the reinforcing fiber sheet reinforcing material 10.

  In the configuration of FIG. 14, the reinforcing fiber sheet reinforcing material 10 is attached to the lower surface 101 of the beam 100 along the longitudinal direction of the concrete beam 100. The reinforcing fiber sheet reinforcing material 10 has a flat steel plate 110 extending along the longitudinal direction of the beam 100 at the end in the width direction, and is fixed to the concrete beam 100 with a fixture such as an anchor 111. Yes. Since fixing is performed at one place in this way, a large number of anchor holes 112 for the anchor 111 are required.

  Further, as described in Patent Document 1, in the configuration shown in FIG. 15, the reinforcing fiber sheet reinforcing material 10 is attached to the lower surface 101 and both side surfaces 102 of the beam 100 along the longitudinal direction of the concrete beam 100. . Further, the end portion in the width direction of the reinforcing fiber sheet reinforcing material 10 is wound around a columnar fixing body 113 provided along the longitudinal direction of the beam 100, and the fixing body 113 is anchored by the anchor 111 to the ceiling of the concrete beam 100. It is fixed on the portion 103.

  However, this example is a reinforcing method in the case of performing shear reinforcement of the concrete beam 100, and the reinforcing fibers 2 in the reinforcing fiber sheet reinforcing material 10 are U-shaped extending to the lower surface 101 and both side surfaces 102 of the beam 100. And arranged in the longitudinal direction of the beam 100. Therefore, it is essential that the end portion of the reinforcing fiber sheet reinforcing material 10 is fixed to the ceiling portion 103 of the concrete beam 100 with the anchor 111 using the fixing body 113.

If the number of laminated reinforcing fiber sheet reinforcing members 10, that is, the number of reinforcing fiber sheets 1 is increased, the cylindrical fixing body 113 is enlarged and the anchor hole 112 for fixing the fixing body 113 is provided. It is necessary to increase the fixing force of the fixing body 113 by the anchor 111 by increasing the depth and the depth. Thus, making the anchor hole 112 larger and deeper may cause destruction of the concrete structure.
Japanese Patent Laid-Open No. 10-298930

According to the results of our research experiments, in the bonding method using the reinforcing fiber sheet reinforcing material, in particular, when a plurality of reinforcing fiber sheet reinforcing materials having the same dimensions are laminated and bonded to the concrete structure surface, It has been found that the following problems occur when the above fixing method is employed.
(1) When a plurality of reinforcing fiber sheet reinforcing materials are laminated and bonded, each layer is bonded at the same position, but if the fixing length required for the design cannot be secured, the tension applied to the reinforcing fiber sheet reinforcing material The force is borne by the sum of the shear strength of the fixture, for example, the anchor, or the adhesion force of the steel plate. Therefore, many anchors are required. Moreover, the area of a steel plate becomes large.
(2) When there are a large number of anchors at the same fixing position, there is a possibility that the drilling of the anchor holes cannot be easily performed depending on the arrangement state of the reinforcing bars of the existing concrete.
(3) In concrete structures such as viaducts, work on temporary scaffolds is the main, so if the area of the steel plate as the fixing body increases, the steel plate may be very heavy and difficult to construct. .
(4) When the number of reinforcing fiber sheet reinforcing materials to be used increases and the fixing body needs to be enlarged, the anchor hole for fixing the fixing body is deepened and enlarged to increase the fixing force. Therefore, there is a risk of destroying the concrete structure.

  Accordingly, an object of the present invention is to reduce the use of steel material and to enable the fixing of the reinforcing fiber sheet reinforcing material with a lightweight structure, thereby facilitating the construction. It is to provide a method for reinforcing a structure such as an object.

  Another object of the present invention is to divide and fix a plurality of reinforcing fiber sheet reinforcing materials to disperse the position of the fixing tool used for fixing, and to provide a degree of freedom for the fixing tool drilling position and facilitate construction. It is possible to provide a method for reinforcing a structure such as a concrete structure or a steel structure.

  Another object of the present invention is to provide a method for reinforcing a structure such as a concrete structure or a steel structure without losing the cross section of the reinforcing fiber sheet reinforcing material.

  Another object of the present invention is to use a plurality of laminated reinforcing fiber sheet reinforcing materials, and in a member subjected to bending, one layer in a cross section in which the reinforcing fiber sheet reinforcing material is not required according to the bending moment distribution. It is an object of the present invention to provide a method for reinforcing a structure such as a concrete structure or a steel structure, which can be fixed for each layer or a plurality of layers and can achieve efficient reinforcement.

The above object is achieved by a method for reinforcing a structure such as a concrete structure or a steel structure according to the present invention. In summary, according to the first aspect of the present invention,
In a reinforcing method for reinforcing a structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials with a resin to the attachment surface of the structure,
(A) On the bonding surface of the structure, n sheets (n: an integer of 2 or more) of reinforcing fiber sheet reinforcing materials are stacked from the bonding surface of the structure to the outside, and bonded with a resin. And
(B) Wrapping both ends in the longitudinal direction of the reinforcing fiber sheet reinforcing material of each layer around a rod-shaped fixing body arranged orthogonal to the longitudinal direction of the reinforcing fiber sheet reinforcing material, and bonding with a resin;
(C) The rod-shaped fixing member is changed from the innermost layer reinforcing fiber sheet reinforcing material attached to the attachment surface of the structure to the nth reinforcing fiber sheet reinforcing material attached to the outermost layer. Sequentially located inward and fixed to the structure with a fixture,
A method for reinforcing a structure is provided.

According to a second aspect of the invention,
In a reinforcing method for reinforcing a structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials with a resin to the attachment surface of the structure,
(A) a step of adhering a first-layer reinforcing fiber sheet reinforcing material to a bonding surface of the structure with a resin;
(B) The first rod-shaped fixing members disposed at the both ends in the longitudinal direction of the first-layer reinforcing fiber sheet reinforcing material at right angles to the longitudinal direction of the first-layer reinforcing fiber sheet reinforcing material. Winding, bonding with resin,
(C) fixing the first rod-shaped fixing body to the structure with a fixture;
(D) a step of laminating the first-layer reinforcing fiber sheet reinforcing material bonded to the attachment surface of the structure and attaching the second-layer reinforcing fiber sheet reinforcing material;
(E) The longitudinal length of the second-layer reinforcing fiber sheet reinforcing material in an inner region from the two first rod-shaped fixing bodies that fix both ends of the first-layer reinforcing fiber sheet reinforcing material A step of winding both ends in the direction around a second rod-shaped fixing member disposed perpendicular to the longitudinal direction of the reinforcing fiber sheet reinforcing material of the second layer, and bonding with a resin;
(F) a step of fixing the second rod-shaped fixing body to the structure with a fixture;
There is provided a method of reinforcing a structure characterized by having at least.

According to a third aspect of the invention,
In a reinforcing method for reinforcing a structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials with a resin to the attachment surface of the structure,
(A) n sheets (n: an integer of 2 or more) of reinforcing fiber sheet reinforcing materials are disposed adjacent to and parallel to each other on the bonding surface of the structure, and are bonded with a resin;
(B) Wrapping both ends in the longitudinal direction of the n reinforcing fiber sheet reinforcing materials around a rod-shaped fixing body arranged orthogonal to the longitudinal direction of the reinforcing fiber sheet reinforcing material, and bonding with a resin;
(C) fixing the rod-shaped fixing body to the structure with a fixture;
A method for reinforcing a structure is provided. Furthermore, (d) affixing at least one reinforcing fiber sheet reinforcing material orthogonal to the n reinforcing fiber sheet reinforcing materials bonded to the attachment surface of the structure,
(E) Wrapping both ends of the orthogonal reinforcing fiber sheet reinforcing material in the longitudinal direction around the rod-shaped fixing body arranged orthogonal to the longitudinal direction of the orthogonal reinforcing fiber sheet reinforcing material, and bonding with a resin;
(F) fixing the rod-shaped fixing body to the structure with a fixing tool;
It can also be configured.

According to a fourth aspect of the invention,
In a reinforcing method for reinforcing a structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials with a resin to the attachment surface of the structure,
(A) a step of adhering a first reinforcing fiber sheet reinforcing material to a sticking surface of the structure with a resin;
(B) Wrapping both ends in the longitudinal direction of the first reinforcing fiber sheet reinforcing material around the first rod-shaped fixing members arranged perpendicular to the longitudinal direction of the first reinforcing fiber sheet reinforcing material, and using resin Bonding process,
(C) fixing the first rod-shaped fixing body to the structure with a fixture;
(D) The second reinforcing fiber sheet reinforcing material is used as a resin adjacent to and in parallel with the first reinforcing fiber sheet reinforcing material bonded to the bonding surface of the structure on the bonding surface of the structure. Bonding process,
(E) Both ends of the second reinforcing fiber sheet reinforcing material in the longitudinal direction are respectively wound around second rod-shaped fixing members arranged orthogonal to the longitudinal direction of the second reinforcing fiber sheet reinforcing material, Bonding process,
(F) a step of fixing the second rod-shaped fixing body to the structure with a fixture;
There is provided a method of reinforcing a structure characterized by having at least. Further, (g) a step of bonding at least one reinforcing fiber sheet reinforcing material orthogonal to the first and second reinforcing fiber sheet reinforcing materials bonded to the attachment surface of the structure with a resin,
(H) a step of winding both ends of the orthogonal reinforcing fiber sheet reinforcing material in the longitudinal direction around the rod-shaped fixing members arranged orthogonal to the longitudinal direction of the orthogonal reinforcing fiber sheet reinforcing material, and bonding them with a resin;
(I) a step of fixing the rod-shaped fixing body to the structure with a fixture;
Can have.

  According to one embodiment of the present invention, the rod-shaped fixing body is fixed to the structure with a fixture in a region where the reinforcing fiber sheet is not present.

  According to another embodiment of the present invention, the rod-shaped fixing member is an elongated member having a longitudinal axis perpendicular to the longitudinal direction of the reinforcing fiber sheet reinforcing material, and the cross-sectional shape is circular, elliptical, The shape is an ellipse or a polygon with corners arcuate.

  According to another embodiment of the present invention, the reinforcing fiber sheet reinforcing material is at least one unidirectionally arranged reinforcing fiber sheet in which reinforcing fibers are arranged in one direction, or a sheet-like woven fabric formed of reinforcing fibers. It is composed of at least one reinforcing fiber sheet.

  According to another embodiment of the present invention, the reinforcing fiber may be PAN-based or pitch-based carbon fiber; metal fiber such as boron fiber, titanium fiber, steel fiber; aramid, PBO (polyparaphenylene benzbisoxazole), polyamide , Organic fibers such as polyarylate and polyester; are used alone or in a hybrid mixed with plural kinds.

  According to another embodiment of the present invention, the resin is a room temperature curing type or thermosetting type epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol resin.

  According to another embodiment of the present invention, the reinforcing fiber sheet reinforcing material is a resin non-impregnated sheet or a semi-cured prepreg impregnated with a resin before being attached to the structure. It is a sheet.

  According to another embodiment of the present invention, the structure is a concrete structure or a steel structure.

According to the present invention,
(1) Construction can be facilitated by reducing the use of the amount of steel per fixing body and enabling fixing of the reinforcing fiber sheet reinforcing material with a lightweight structure.
(2) By fixing a plurality of reinforcing fiber sheet reinforcing materials separately, the positions of the fixing tools used for fixing are dispersed, and there is a degree of freedom in fixing tool drilling positions, thus facilitating construction. .
(3) It is possible to provide a method of reinforcing a structure such as a concrete structure or a steel structure without changing the cross section of the reinforcing fiber sheet reinforcing material by changing the attachment of the fixing tool.
(4) In a member which uses a plurality of laminated reinforcing fiber sheet reinforcing materials and undergoes bending, every layer or every plurality of layers in a cross section where the reinforcing fiber sheet reinforcing material is no longer necessary according to the bending moment distribution Can be fixed, and efficient reinforcement can be achieved.

  Hereinafter, a method for reinforcing a structure such as a concrete structure or a steel structure according to the present invention will be described in more detail with reference to the drawings.

Example 1
The method for reinforcing a structure according to the present invention is a method of reinforcing a concrete structure or a steel structure such as a beam or girder member, a slab member such as a wall, a pillar member, a floor slab, or the like, such as a building or a civil engineering structure. Although it can apply widely at the time of bending reinforcement, a present Example demonstrates the case where it applies to the bending reinforcement of a concrete beam.

  The present invention relates to a reinforcing method for reinforcing a structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials to a bonding surface of the structure with a plurality of resins. One Example of the reinforcing fiber sheet 1 which comprises the reinforcing fiber sheet reinforcing material 10 to be shown is shown.

  The reinforcing fiber sheet 1 has a predetermined unit weight in which continuous reinforcing fibers 2 are uniformly aligned and arranged in one direction. The reinforcing fiber sheet 1 has a length (L0) larger than a width (W0). That is, in this embodiment, the length (L0) along the fiber length direction is orthogonal to the fiber length direction. The so-called elongate shape is made larger than the width (W0). The length (L0) and width (W0) of the reinforcing fiber sheet 1 are appropriately determined according to the size and shape of the structure to be reinforced.

  Reinforcing fibers 2 include PAN-based or pitch-based carbon fibers; metal fibers such as boron fibers, titanium fibers, and steel fibers; and further, aramid, PBO (polyparaphenylene benzbisoxazole), polyamide, polyarylate, polyester, etc. Organic fibers can be used alone or in a hybrid mixed with a plurality of types.

  In order to facilitate the handling of the reinforcing fiber sheet 1, as shown in FIG. 12, one side or both sides of the reinforcing fiber layer 4 in which the reinforcing fibers 2 are arranged in one direction have a diameter of, for example, 2 to 50 μm. It can also be set as the structure supported by the mesh-shaped support body sheet | seat 3 produced with the glass fiber or the organic fiber.

  As a method for holding the reinforcing fiber layer 4 on the mesh-like support sheet 3, for example, the surface of the warp yarn 6 and the weft yarn 7 constituting the mesh-like support sheet 3 is impregnated with a low melting point type thermoplastic resin in advance. Then, the mesh-like support sheet 3 is laminated on both surfaces of the reinforcing fiber layer 4 and heated and pressurized, and the warp yarn 6 and weft yarn 7 portions of the mesh-like support sheet 3 are welded to the reinforcing fiber layer 4.

  Alternatively, as shown in FIG. 13, the reinforcing fiber sheet 1 is driven perpendicularly to the reinforcing fibers 2 arranged in one direction, and the fibers 5 are driven as a weft thread at regular intervals to prevent the fibers 2 from being separated. It is also possible to make a sheet having a structure like a so-called woven fabric (cloth). As the fiber 5, glass fiber or organic fiber having a diameter of 2 to 50 μm, for example, can be used in the same manner as described above. The double-structured composite fiber as arranged has a great effect of preventing the fiber bundle from being loosened and is preferably used. Although there is no particular limitation on the weft driving distance (p) in this method, it is usually selected in the range of 1 to 15 mm in consideration of the handleability of the produced sheet.

  Furthermore, although not shown, the reinforcing fiber sheet 1 may be a sheet-like woven fabric woven using the reinforcing fibers 2 and having two, three, and four main axes of fibers. it can. For example, as the woven fabric, a plain woven fabric, a twill woven fabric, a satin woven fabric in which the reinforcing fibers 2 are oriented in two directions, a triaxial, a four-axial woven fabric in which the reinforcing fibers 2 are oriented in three or four directions, and the like are used. Can do.

  Further, the reinforcing fiber sheet reinforcing material 10 can be constituted by a single reinforcing fiber sheet 1 or can be constituted by laminating a plurality of reinforcing fiber sheets 1 having the same configuration or different configurations. good.

The matrix resin (that is, the adhesive) impregnated in the reinforcing fiber sheet reinforcing material 10 when the reinforcing method of the present invention is carried out can be a thermosetting resin. Alternatively, a thermosetting epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol resin can be preferably used. The amount of resin impregnation, that is, the amount of resin applied to the reinforcing fiber sheet reinforcing material 10 is 0.6 to 1 as the standard applying amount when the fiber basis weight of the reinforcing fiber sheet reinforcing material 10 is in the range of 150 to 600 g / m ^{2. 2} kg / m ² .

  An embodiment of the reinforcing method of the present invention will be described. In this embodiment, the concrete beam 100 is bent and reinforced.

In this embodiment, the reinforcing fiber sheet 1 uses a monofilament having a fiber diameter of about 7 to 10 μm, for example, a fiber bundle in which about 6000 to 24,000 fibers are converged, that is, carbon fiber 2, and the carbon fiber is uniformly formed The carbon fiber sheets were aligned and aligned in one direction. The thickness of the carbon fiber sheet was 0.083 to 0.333 mm (fiber basis weight 150 to 600 g / m ² ). An epoxy resin was used as the resin.

  In carrying out the bonding method using the reinforcing fiber sheet reinforcing material 10 according to the present embodiment, first, as shown in FIGS. 1A to 1E, one or more reinforcing fiber sheets 1 are laminated. A plurality of reinforcing fiber sheet reinforcing materials 10 configured as described above are prepared. In this embodiment, two reinforcing fiber sheet reinforcing materials 10a1 and 10a2 are prepared.

  The reinforcing fiber sheet reinforcing material 10 is stuck to the sticking surface 101 of the structure 100. In this specification, “inner side” means sticking a sheet of a structure such as the concrete beam 100. The surface 101 side is meant, and “outside” means the direction away from the sheet sticking surface 101. Further, when the reinforcing fiber sheet reinforcing material 10 is bonded to the sheet adhering surface 101 and used for reinforcement, the direction from both ends of the reinforcing fiber sheet reinforcing material 10 toward the center is defined as “inward”, and the both end portions The side is called “outside”.

  In this embodiment, as shown in FIG. 1 and FIG. 2, on the sheet sticking surface 101 of the concrete beam 100, the first reinforcing fiber sheet reinforcing material 10a1 forming the first layer of the inner layer, and the top thereof It is assumed that the second reinforcing fiber sheet reinforcing material 10a2 forming the second layer of the outer layer laminated on is attached. However, the present invention is not limited to this. That is, three or more reinforcing fiber sheet reinforcing materials 10 used for reinforcement can be laminated.

  In addition, as described above, the reinforcing fiber sheet reinforcing material 10 (10a1, 10a2) can each be composed of one reinforcing fiber sheet 1, or a plurality of sheets having the same configuration or different configurations. The reinforcing fiber sheets 1 may be laminated.

  According to the present embodiment, as shown in FIGS. 1 (a) and 1 (b), the prepared first reinforcing fiber sheet reinforcing material 10a1 is applied to the concrete beam sheet adhering surface 101 to which an adhesive is subbed. Paste to. Next, the defoaming roller 30 is used to defoam and impregnate. Further, if necessary, an adhesive, that is, a matrix resin is applied (overcoated) to the reinforcing fiber sheet reinforcing material 10a1, and the reinforcing fiber sheet reinforcing material 10a1 is sufficiently impregnated with the matrix resin, so that the reinforcing fiber sheet reinforcing material 10a1 is provided. Adhere to the concrete beam sheet attachment surface 101.

  Next, a fixing method of the reinforcing fiber sheet reinforcing material 10a1 will be described with reference to FIG. 1 (c) and FIGS. 2 (a), 2 (b), and 2 (c).

  FIGS. 2A, 2B, and 2C show only one end of the concrete beam 100 and the reinforcing fiber sheet reinforcing material 10a (that is, the left end in the drawing). 100 and the other end portion of the reinforcing fiber sheet reinforcing material 10a1.

  First, as shown in FIG. 1C and FIGS. 2A, 2B, and 2C, the end portion of the reinforcing fiber sheet reinforcing material 10a1 is wound around the first fixing body 20a1 one or more times.

  The fixing body 20a1 is a member extending in the axial direction, and the length (Lx) in the axial direction (see FIG. 2B) is the same as the width (W0) of the first reinforcing fiber sheet reinforcing material 10a1. Or somewhat larger.

  Further, the fixing body 20a1 has a cylindrical shape with a circular cross section in the present embodiment, but is not limited thereto. The fixing member 20a1 can have any shape as long as the reinforcing fiber sheet reinforcing material 10a1 is wound around the fixing member 20a1. For example, as shown in FIGS. 3A to 3F, in addition to a fixing body (FIG. 3A) having a circular cross section, a square (FIG. 3B), a triangle (FIG. 3 (c)), a rectangular shape (FIG. 3 (d)), etc., and a polygonal fixing body having an arcuate corner, and a cross-sectional shape having an oval shape (track shape) (FIG. 3). (E)) is a columnar body having various cross-sectional shapes, such as a fixing body (FIG. 3 (f)) whose peripheral surface is an elliptical cross-sectional shape, or is illustrated. A rod-shaped fixing body 20 that is not a hollow cylindrical body can be used.

  The first reinforcing fiber sheet reinforcing material 10a1 is already impregnated with a matrix resin, and is therefore adhered to the peripheral surface of the fixing member with the resin. If necessary, a resin (adhesive) may be further applied to the peripheral surface of the fixing body.

  Next, the fixing body 20a1 around which the reinforcing fiber sheet reinforcing material 10a1 is wound uses a through-hole 21a1 formed in the diameter direction of the cylindrical fixing body 20a1, as shown in FIG. 2 (c). Then, it is attached to the concrete structure 100 by a fixture, for example, an anchor 22a1. At this time, it is not essential to press the reinforcing fiber sheet reinforcing material 10a1 against the concrete structure surface 101 by the fixing body 20a1. Further, when the resin is cured in this state, the first reinforcing fiber sheet reinforcing material 10a1 is fixed to the concrete structure 100.

  Next, as shown in FIG. 1 (d), after the first reinforcing fiber sheet reinforcing material 10 a 1 adhered to the surface of the concrete structure 100 as described above and fixed at the ends is cured. Alternatively, in a still uncured state, the second reinforcing fiber sheet reinforcing material 10a2 is laminated with the first reinforcing fiber sheet reinforcing material 10a1 and adhered with a resin.

  As shown in FIG. 1 (d), in the present embodiment, the second reinforcing fiber sheet reinforcing material 10a2 is attached inward from the both-end fixing portions of the first reinforcing fiber sheet reinforcing material 10a1. .

  Next, as illustrated in FIGS. 1E and 2A, 2B, and 2C, both ends of the second reinforcing fiber sheet reinforcing material 10a2 are arranged at the first reinforcing fiber sheet reinforcing material 10a1. In the same manner as described above, the both end portions are wound once or a plurality of times around the second fixing member 20a2 at a position P1 inward from the first fixing member 20a1.

  The second reinforcing fiber sheet reinforcing material 10a2 is already impregnated with a matrix resin, and is adhered to the peripheral surface of the second fixing body with the resin. If necessary, a resin may be further applied to the peripheral surface of the fixing body.

  Next, the fixing body 20a2 around which the reinforcing fiber sheet reinforcing material 10a2 is wound is attached to the concrete structure 100 by the anchors 22a2 using the through holes 21a2 formed in the diameter direction of the cylindrical fixing body 20a2. At this time, it is not essential to press the reinforcing fiber sheet reinforcing material 10 against the concrete structure surface 101 by the fixing body 20a2. Further, in this state, the resin is cured and the second reinforcing fiber sheet reinforcing material 10a2 is fixed to the concrete structure 100.

  The first and second fixing bodies 20a1 and 20a2 may have the same shape or dimensions, or may have different shapes and dimensions.

  According to the present embodiment, the carbon fiber sheet reinforcing material 10 (10a1, 10a2) is fixed to the concrete structure 100 using the first and second fixing bodies 20a1, 20a2.

  In the above embodiment, the reinforcing fiber sheet reinforcing material 10 is constituted by the first and second reinforcing fiber sheet reinforcing materials 10a1 and 10a2, and the concrete structure 100 is constituted by the first and second fixing bodies 20a1 and 20a2. However, the present invention is not limited to this.

  For example, as shown in FIG. 4, when the reinforcing fiber sheet reinforcing material 10 is composed of the first, second and third reinforcing fiber sheet reinforcing materials 10 (10a1, 10a2, 10a3), It can be fixed to the concrete structure 100 by the second and third fixing bodies 20a1, 20a2, and 20a3.

  Further, when a plurality of reinforcing fiber sheet reinforcing materials 10 (10a1, 10a2, 10a3) are used, each reinforcing fiber sheet reinforcing material 10a1, 10a2, 10a3 is necessarily composed of reinforcing fiber sheets 1 having the same number of layers. Therefore, in this case, the reinforcing fiber sheets 1 having different numbers of layers are wound around the fixing members 20a1, 20a2, and 20a3 to be fixed.

  Next, referring to FIG. 5, for example, when fixing the ends of the reinforcing fiber sheet reinforcing material 10 (10a1, 10a2, 10a3) with the first, second and third fixing bodies 20a1, 20a2, 20a3. The relationship between the fixing positions of the first, second, and third fixing members 20a1, 20a2, and 20a3 and the bending moment will be described.

  The fixing method of FIG. 5A is a case where the fixing position of each reinforcing fiber sheet reinforcing material 10 (10a1, 10a2, 10a3) is determined depending on the bending moment, and is designed from the bending moment distribution curve. The required fixing positions of the reinforcing fiber sheet reinforcing materials 10 (10a1, 10a2, 10a3) are determined.

  In this case, the fixing length at the end of each reinforcing fiber sheet reinforcing material 10 (10a1, 10a2, 10a3), that is, the winding amount is selected to be about several tens of centimeters as will be described later. . The distances P1 and P2 between the first, second, and third fixing bodies 20a1, 20a2, and 20a3 are freely selected within a range of about several meters, for example, about 2 m.

  That is, according to the fixing method, as described above, when reinforcing the member subjected to bending, the plurality of laminated reinforcing fiber sheet reinforcing materials 10 are used, and the distance P between the fixing bodies 20 is changed. Accordingly, fixing can be performed for each layer or for each of a plurality of layers in a cross section in which a reinforcing fiber sheet is no longer required according to the bending moment distribution, and efficient reinforcement can be achieved.

  On the other hand, the fixing method of FIG. 5B is a case where the fixing position of each reinforcing fiber sheet reinforcing material 10 (10a1, 10a2, 10a3) is determined without depending on the bending moment, and from the bending moment distribution curve, The fixing position of each reinforcing fiber sheet reinforcing material 10 (10a1, 10a2, 10a3) is determined in the outer region from the position where the bending moment is zero.

  In this case, the fixing length at the end of each reinforcing fiber sheet reinforcing material 10 (10a1, 10a2, 10a3), that is, the winding amount is selected to be about several tens of centimeters as in the above case. The distances P1 and P2 between the first, second, and third fixing members 20a1, 20a2, and 20a3 may be about several tens of centimeters, and the fixing members 20a1, 20a2, and 20a3 may be in close contact with each other.

  According to this fixing method, fixing of the end portions of the reinforcing fiber sheet reinforcing materials 10 (10a1, 10a2, 10a3) is performed in a region where the bending moment is zero, so that there is an advantage that safety is high. However, this fixing method requires that each reinforcing fiber sheet reinforcing material 10 (10a1, 10a2, 10a3) be longer than the fixing method of FIG. Compared with the fixing method of FIG.

  In any of the fixing methods, according to the present embodiment, the ends of the reinforcing fiber sheet reinforcing materials 10 (10a1, 10a2, 10a3) are wound around the fixing body 20 (20a1, 20a2, 20a3). Thus, the tensile force applied to each reinforcing fiber sheet reinforcing material 10 (10a1, 10a2, 10a3) is borne, and it is not necessary to take extra fixing length. Therefore, the fixing body itself can be reduced in size, and the amount of steel material per fixing body can be reduced.

  Further, according to the present embodiment, each reinforcing fiber sheet reinforcing material 10 (10a1, 10a2, 10a3) is fixed for each layer, so that the degree of freedom of anchor drilling positions is fixed at one place. Higher than the case.

  That is, in existing concrete bridges and the like, the reinforcing bars may not be arranged as shown in the drawing, and when it is supposed to fix each reinforcing fiber sheet reinforcing material 10 at one place as in the past, anchors Since there are many holes, it may not be easy to construct.

  The inventors examined the relationship between the shape of the fixing body 20 and the number of windings of the reinforcing fiber sheet 1. Next, the examination result will be described.

(Test 1)
FIG. 6 shows a schematic configuration of the test apparatus 200 used in this study.

  As shown in the figure, a cylindrical body having a circular section (Lx) of 6.8 cm was used as the fixing body 20. The fixing body 20 was mounted on the fixing jig 201 with mounting portions 20 </ b> F integrally formed on both end surfaces, and fixed by the mounting tool 202 so as not to rotate. The diameter (D) of the fixing body 20 was 20 mm, 40 mm, and 60 mm, as shown in Table 1 below.

As the reinforcing fiber sheet reinforcing material 10, a carbon fiber sheet 1 having a configuration shown in FIG. 12 and made by aligning carbon fibers as reinforcing fibers in one direction was used. As the carbon fiber sheet 1 used in this study, a high-strength carbon fiber sheet FTS-C1-30 (nominal tensile strength 3400 N / mm ² ) manufactured by Nippon Steel Composite Co., Ltd. was used. The width (W0) of the carbon fiber sheet 1 was 12.5 mm.

  As shown in the drawing, the carbon fiber sheet 1 was wound around a fixing body 20 having a circular cross section, and fixed to the peripheral surface of the fixing body 20 with an epoxy resin.

  On the other hand, the other end portion (tab attaching portion) 1F of the carbon fiber sheet 1 was lifted vertically upward from the fixing body 20 and attached to a tensile test apparatus (not shown). The length (L1) of the upper end tab attaching portion 1F of the carbon fiber sheet 1 was 60 mm, and the length (L2) from the tab attaching portion 1F to the winding start portion with respect to the fixing body 20 was 250 mm.

  The experimental variables were the diameter (D) of the cylindrical section of the fixing body 20 and the number of windings.

  The carbon fiber sheet test piece 1 was made into seven bodies, and in order to examine the physical properties of the carbon fiber sheet 1, a normal continuous fiber sheet tensile test was performed in advance.

  As test results, the average values of tensile strength are shown in Table 1 and FIG. From this test result, it was confirmed that the carbon fiber sheet would break when wound on a fixing body having a circular cross section with a diameter of 20 mm. Further, it was found that the strength of the test piece using the fixing body increases as the diameter of the fixing body and the number of windings of the test piece around the fixing body increase.

In the case where the diameter (D) of the fixing body 20 is 40 mm and 60 mm and the test sample is wound twice, it exceeds the nominal tensile strength (3400 N / mm ² ).

  As for the breaking position, all of the specimens were mainly broken in the vicinity of the fixing body. Since the fiber direction changes at the winding position, it is considered that stress concentration occurs near the fixing body.

  Since the stress concentration becomes smaller as the diameter (D) of the fixing body 20 is larger, it is considered preferable that the diameter (D) is 40 mm or more and the winding is performed two or more times.

(Test 2)
The same test apparatus 200 as in Test 1 except that a carbon fiber sheet 1 different from Test 1 is used, and the diameter (D) of the fixing body 20 is 40 mm or 60 mm as shown in Table 2 below. The same test piece was produced using this and tested in the same manner.

The carbon fiber sheet 1 used in this test 2 is a high-strength carbon fiber sheet FTS manufactured by Nittsu Composite Co., Ltd., made by aligning carbon fibers as reinforcing fibers in one direction, having the configuration shown in FIG. -C1-60 (nominal tensile strength 3400 N / mm ² ) was used. The width (W0) of the carbon fiber sheet 1 was 12.5 mm, as in Test 1.

  As a test result, the average value of tensile strength is shown in Table 2 and FIG. From this test result, it was confirmed that the carbon fiber sheet would break when wound on a fixing body having a circular cross section with a diameter of 20 mm. Further, it was found that the strength of the test piece using the fixing body increases as the diameter of the fixing body and the number of windings of the test piece around the fixing body increase.

In the case where the diameter (D) of the fixing body 20 is 40 mm and 60 mm and the test sample is wound twice, it exceeds the nominal tensile strength (3400 N / mm ² ).

  As for the breaking position, all of the specimens were mainly broken in the vicinity of the fixing body. Since the fiber direction changes at the winding position, it is considered that stress concentration occurs near the fixing body.

  Since the stress concentration becomes smaller as the diameter (D) of the fixing body 20 is larger, it is considered preferable that the diameter (D) is 40 mm or more and the winding is performed two or more times.

  In description of the said Example, as shown to Fig.1 (a)-(e) and Fig.2 (a)-(c), in the sheet sticking surface 101 of the concrete beam 100, the 1st layer of the inner layer is formed. Although the first reinforcing fiber sheet reinforcing material 10a1 to be formed and the second reinforcing fiber sheet reinforcing material 10a2 forming the second layer of the outer layer laminated thereon are described as being adhered, The invention is not limited to this.

  That is, the reinforcing fiber sheet reinforcing material 10 used for reinforcement can be laminated by n sheets (n is an integer of 2 or more, and usually n is 2 to 10).

Therefore, the reinforcing method of the structure of the present embodiment is a reinforcing method of reinforcing the structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials with a resin to the attachment surface of the structure.
(A) On the sticking surface 101 of the structure 100, n sheets (n: an integer of 2 or more) of reinforcing fiber sheet reinforcing materials 10 are laminated from the sticking surface 101 of the structure 100 to the outside and laminated on the resin. Glue
(B) Each of the longitudinal ends of the reinforcing fiber sheet reinforcing material 10 of each layer is wound around the rod-shaped fixing body 20 arranged orthogonal to the longitudinal direction of the reinforcing fiber sheet reinforcing material 10, and bonded with a resin.
(C) The rod-shaped fixing body 20 is sequentially positioned inward from the innermost layer first reinforcing fiber sheet attached to the attachment surface of the structure to the nth reinforcing fiber sheet attached to the outermost layer. Then, it is fixed to the structure 100 with the fixture 22.
It has a feature in configuration.

  Therefore, according to the present embodiment, it is possible to reduce the use of the steel material and to fix the reinforcing fiber sheet reinforcing material with a light-weight structure, and therefore, the construction is easy.

  Further, by fixing the reinforcing fiber sheet reinforcing material separately, the positions of fixing tools used for fixing, for example, anchors, are dispersed, and there is a degree of freedom in anchor drilling positions, so that construction is easy.

  Furthermore, in a member that uses a plurality of laminated reinforcing fiber sheet reinforcing materials and undergoes bending, the reinforcing fiber sheet reinforcing material is not required for the bending moment distribution for each layer or for each layer. Can be fixed, and efficient reinforcement can be achieved.

Example 2
9A and 9B show another embodiment of the present invention.

  In Example 1, as shown in FIGS. 2A, 2 </ b> B, and 2 </ b> C, the fixing body 20 (20 a 1 and 20 a 2) around which the reinforcing fiber sheet reinforcing material 10 (10 a 1 and 10 a 2) is wound is cylindrical. The fixing members 20 (20a1, 20a2) were attached to the concrete structure 100 by anchors 22 (22a, 22b) using the through holes 21 (21a1, 21a2) formed in the diameter direction.

  In such a configuration, a defective portion is generated in the reinforcing fiber sheet reinforcing material 10 (10a1, 10a2) wound around the fixing body 20.

  According to the present embodiment, there is a feature in the fixing method in which a defect portion does not occur in the fixed reinforcing fiber sheet reinforcing material 10 (10a1, 10a2).

  That is, the reinforcing method of the present embodiment has the same configuration as that described in the first embodiment with reference to FIG. Therefore, about the whole reinforcement method, description of Example 1 is used and description for the second time is abbreviate | omitted. Hereinafter, the fixing method of the reinforcing fiber sheet reinforcing material which characterizes the present embodiment will be described.

  According to the present embodiment, as shown in FIGS. 9A and 9B, the anchor 22 (22a1, 22a2) is inserted into the fixing body 20 (20a1, 20a2) as in the first embodiment. The through holes 21 (21a1, 21a2) are formed in the diametrical direction, but the through holes 21 (21a1, 21a2) are not located in the region where the reinforcing fiber sheet reinforcing material 10 (10a1, 10a2) is wound, that is, In the axial direction of the fixing body 20, the fixing body 20 is formed at a position on the outer side in the axial direction than the region where the reinforcing fiber sheet reinforcing material 10 is wound.

  Therefore, according to the fixing method of this embodiment, no defective portion is generated in the reinforcing fiber sheet reinforcing materials 10a1 and 10a2 wound around the fixing body 20.

  9 (a) and 9 (b) show a mode in which two reinforcing fiber sheet reinforcing materials 10 are used. The principle of this example is the same as in the case of Example 1, and n (n is The same applies to the case of an integer of 2 or more.

  According to the structure reinforcing method of the present embodiment, the same effects as those of the first embodiment can be achieved, and the cross section of the reinforcing fiber sheet 1 is not lost.

Example 3
FIG. 10 shows another embodiment of the present invention.

  In Example 2, as shown in FIG. 9B, the width (Wh) of the lower surface region 101 of the concrete beam 100 is larger than the width (W0) of the reinforcing fiber sheet reinforcing material 10 to be applied, and the lower surface of the beam 100 In the case where drilling for the anchor 22 is possible in the portion 101, it can be suitably employed.

  In the present embodiment, as shown in FIG. 10B, the width (Wh) of the lower surface region 101 of the concrete beam 100 is substantially the same as the width (W0) of the reinforcing fiber sheet reinforcing material 10 to be applied. Alternatively, it is preferably employed when drilling for the anchor 22 in the lower surface portion 101 of the beam 100 is extremely difficult.

  Further, the reinforcing method of the present embodiment has the same configuration as that described in the first embodiment with reference to FIG. Therefore, about the whole reinforcement method, description of Example 1 is used and description for the second time is abbreviate | omitted. Hereinafter, the fixing method of the reinforcing fiber sheet reinforcing material which characterizes the present embodiment will be described.

  That is, according to the present embodiment, as shown in FIGS. 10A and 10B, the fixing body 20 (20a1, 20a2) has a length (Lx) in the axial direction of the reinforcing fiber sheet reinforcing material 10 (10a1). 10a2) is substantially the same as or slightly longer than the width (W0), and one end of a support plate 23 (23a1, 23a2) is integrally attached to both end faces thereof. The other end of the support plate 23 (23a1, 23a2) extends to the side surface portion 202 of the concrete beam 100, and the support plate 23 has a through hole (for inserting the anchor 22 (22a1, 22a2)). (Not shown) is formed.

  Accordingly, the fixing body 20 (20a1, 20a2) around which the ends of the reinforcing fiber sheet reinforcing material 10 (10a1, 10a2) are wound uses the through hole of the support plate 23 (23a1, 23a2) to fix the anchor 22 (22a1). , 22a2) and attached to the side surface portion 102 of the concrete structure 100.

  Therefore, according to the fixing method of the present embodiment, as in the case of the second embodiment, no defect portion is generated in the reinforcing fiber sheet reinforcing material 10 (10a1, 10a2) wound around the fixing body 20 (20a1, 20a2). .

  10 (a) and 10 (b) show an embodiment in which two reinforcing fiber sheet reinforcing materials 10 are used. The principle of this example is the same as in the case of Examples 1 and 2, n ( The same applies to the case where n is an integer of 2 or more.

  According to the method for reinforcing a structure of the present embodiment, the same effect as in the case of Embodiment 1 can be achieved, and the cross section of the reinforcing fiber sheet is not lost, and the fixing method is more excellent.

Example 4
11 (a), 11 (b) and 11 (c) show another embodiment of the structure reinforcing method of the present invention. In the present embodiment, for example, a floor slab, reinforcement that is suitably applied when bending reinforcement of the structure 100 in which the area requiring bending reinforcement is larger than the beam described in the first embodiment or the like. A method will be described.

  First, with reference to FIG. 11 (a), in this embodiment, in carrying out the bonding method using the reinforcing fiber sheet reinforcing material 10, first, one or more reinforcing fiber sheets 1 are laminated. A plurality of reinforcing fiber sheet reinforcing materials 10 are prepared, and in this embodiment, four sheets of first, second, third and fourth reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, 10d1 are prepared.

  In this embodiment, the reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, 10d1 can all be the same, and the specific reinforcing material is a different number of reinforcing fibers using the same reinforcing fiber. It can also be constituted by a sheet. Furthermore, if necessary, specific ones of the reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1 can be configured by different reinforcing fibers themselves.

  In this embodiment, as shown in FIG. 11A, the first, second, third, and fourth reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, 10 d 1 are arranged in parallel to each other and bonded to the sheet sticking surface 101. This process is the same as the process described in Example 1 with reference to FIGS.

  That is, the prepared first, second, third, and fourth reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1 are attached to the concrete floor slab sheet attaching surface 101 to which the adhesive is subbed. Next, defoaming and impregnation are performed using a defoaming roller. Further, if necessary, an adhesive, that is, a matrix resin is applied (overcoated) to the reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1, and the matrix resin is applied to the reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1. The first, second, third and fourth reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1 are adhered to the concrete floor slab sheet attaching surface 101 with sufficient impregnation.

  Next, in the first embodiment, the same as described with reference to FIGS. 1C and 2A, 2B, and 2C, the first, second, third, and fourth. The ends of the reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1 are wound around the first, second, third, and fourth fixing bodies 20a1, 20b1, 20c1, and 20d1 one or more times.

  The first, second, third, and fourth reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1 are already impregnated with the matrix resin, and are thus adhered to the peripheral surface of the fixing body with an adhesive. If necessary, an adhesive may be further applied to the peripheral surface of the fixing body.

  Next, the first, second, third, and fourth fixing members 20a1, 20b1, and 20c1 around which the first, second, third, and fourth reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1 are wound. 20d1 are through-holes formed in the diameter direction of the cylindrical fixing members 20a1, 20b1, 20c1, and 20d1 in the same manner as described with reference to FIG. ) Is attached to the concrete structure 100 using a fixture such as anchors 22a1, 22b1, 22c1, and 22d1. At this time, it is not essential to press the reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1 to the concrete structure surface 101 by the fixing members 20a1, 20b1, 20c1, and 20d1. In this state, when the resin is cured, the first, second, third and fourth reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1 are fixed to the concrete structure 100.

  As in the case of the first embodiment, the fixing body 20 can have any shape as long as the reinforcing fiber sheet can be wound. For example, as shown in FIG. A columnar body or a cylindrical body having a cross-sectional shape of a triangle, a square, a rectangle, an ellipse, an oval, or the like can be used.

  In this embodiment, a gap G may be provided between the reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, and 10d1 adjacent to each other, and in close contact, that is, the gap G is substantially zero. You may arrange so that it may become.

  FIG. 11 (a) shows a mode in which four reinforcing fiber sheet reinforcing materials 10 are used, but the principle of this embodiment is not limited to four, but n (n: 2 or more) It is similarly applied to the case where n is generally about 2 to 10.

As described above, the replenishment method of the present embodiment having the above-described configuration is a reinforcement that reinforces a structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials 10 to a sticking surface 101 of the structure 100 with a plurality of resins. In the method
(A) Adhering n sheets (n: an integer of 2 or more) of reinforcing fiber sheet reinforcing materials 10 to the adhering surface 101 of the structure 100 adjacent to each other and in parallel with a resin;
(B) Each of the longitudinal ends of the n reinforcing fiber sheet reinforcing materials 10 is wound around the rod-shaped fixing body 20 arranged orthogonal to the longitudinal direction of the reinforcing fiber sheet reinforcing material 10 and bonded with a resin.
(C) The rod-shaped fixing body 20 is fixed to the structure 100 with a fixture 22;
It has a feature in configuration.

  FIG. 11B shows a modified embodiment of the above embodiment.

  In this modified embodiment, the reinforcing fiber sheet reinforcing material of the first, second, third and fourth reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, 10d1 in the above-described embodiment, that is, In this example, as shown in FIG. 11B, another reinforcing fiber sheet reinforcing material 10a2 may be further laminated on the first reinforcing fiber sheet reinforcing material 10a1 in the same manner as in Example 1. good. Of course, another reinforcing fiber sheet reinforcing material 10 may be laminated in the same manner on all of the second, third and fourth reinforcing fiber sheet reinforcing materials 10b1, 10c1, 10d1.

  Further, the number of laminated reinforcing fiber sheet reinforcing materials 10 to be laminated is not limited to two, but, as described in the first embodiment, n sheets (n: an integer of 2 or more), usually n = 2. About 10 to 10 layers may be stacked.

  Further, FIG. 11C shows a modified embodiment of the present embodiment.

  In this modified embodiment, the first, second, third, fourth and fifth reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, 10d1, 10e1 are the same as described with reference to FIG. Is stuck to the sticking surface 101 of the structure 100 and fixed by the fixing bodies 20a1, 20b1, 20c1, 20d1, and 20e.

  The first, second, third, fourth and fifth reinforcing fiber sheet reinforcing materials 10a1, 10b1, 10c1, 10d1, 10e1 are orthogonal to the other sheet reinforcing materials 10f1, 10g1, 10h1. 10i1, 10j1, 10k1, 10l1 are stacked. The number of stacked layers is not limited to 5, but may be n (n: an integer of 2 or more), usually n = 2 to 10.

That is, according to the modified example, in addition to the steps described in the steps (a) to (c) described in the present example,
(D) Affixing at least one orthogonal reinforcing fiber sheet reinforcing material 10 orthogonally to the n reinforcing fiber sheet reinforcing materials 10 bonded to the attaching surface 101 of the structure 100;
(E) Wrapping both ends in the longitudinal direction of the orthogonal reinforcing fiber sheet reinforcing material 10 around the rod-shaped fixing body 20 arranged orthogonal to the longitudinal direction of the orthogonal reinforcing fiber sheet reinforcing material 10, and bonding with a resin;
(F) The rod-shaped fixing body 20 is fixed to the structure 100 with a fixture.
It has a feature in configuration.

  Further, in the above embodiment and the modified embodiment, as shown in FIGS. 11A, 11B, and 11C, the fixing body 20 is penetrated to insert the anchor 22 as in the first embodiment. Although the hole 21 is formed in the diameter direction, as described in the second embodiment, the through hole 21 is not a region where the reinforcing fiber sheet reinforcing material 10 is wound, that is, the axial direction of the fixing body 20. The reinforcing fiber sheet reinforcing material 10 may be formed at a position outward in the axial direction from the region around which the reinforcing fiber sheet reinforcing material 10 is wound.

  In the present embodiment and the modified embodiment, the same effects as those in the first and second embodiments can be achieved.

Example 5
In Examples 1 to 4, the reinforcing fiber sheet 1 not impregnated with the resin, that is, the reinforcing fiber sheet reinforcing material 10 is used, and when the resin is adhered to the surface of the concrete structure, the resin is reinforced with the reinforcing fiber sheet reinforcing material 10. The reinforcing fiber sheet reinforcing material 10 in the form of a prepreg already impregnated with a resin can also be used.

  That is, it is also possible to pre-impregnate the matrix resin and pre-form the resin-impregnated reinforcing fiber sheet reinforcing material 10, that is, the prepreg sheet to the bonding surface 101 such as a concrete structure with an adhesive. .

  Also in this embodiment, the matrix resin can be a thermosetting resin as described in the first embodiment. As the thermosetting resin, a room temperature curable epoxy resin, a thermosetting epoxy resin, a vinyl resin can be used. An ester resin, an MMA resin, an unsaturated polyester resin, or a phenol resin can be preferably used.

  Further, as the adhesive resin for adhering the resin-impregnated reinforcing fiber sheet reinforcing material 10 in the form of a prepreg to the surface 101 such as a concrete beam or a floor slab, the same or similar resin as the matrix resin can be used.

  Since the fixing method of the end portion of the resin-impregnated reinforcing fiber sheet reinforcing material 10 in the prepreg form is the same as that described in the first and second embodiments, the description thereof will be omitted.

  In the said Examples 1-5, although demonstrated regarding reinforcement of a concrete structure, this invention can be applied similarly also at the time of reinforcement of a steel structure, and can achieve the same effect.

It is a figure for demonstrating the process of one Example of the reinforcement method of the structure according to this invention. It is a figure for demonstrating one Example of the reinforcement method of the structure according to this invention. FIG. 3 is a cross-sectional view illustrating a configuration of a fixing body. It is a figure for demonstrating the other Example of the reinforcement method of the structure according to this invention. It is a figure explaining the relationship between the fixing position of a fixing body, and a bending moment. It is a schematic block diagram of the test apparatus for examining the effect of the reinforcement method of the structure according to this invention. 3 is a graph showing the relationship between the diameter and the number of windings of a fixing body and the tensile strength. 3 is a graph showing the relationship between the diameter and the number of windings of a fixing body and the tensile strength. It is a figure for demonstrating the other Example of the reinforcement method of the structure according to this invention. It is a figure for demonstrating the other Example of the reinforcement method of the structure according to this invention. It is a figure for demonstrating the other Example of the reinforcement method of the structure according to this invention. It is a perspective view which shows one Example of the reinforced fiber sheet which can be used by this invention. It is a perspective view which shows the other Example of the reinforcing fiber sheet which can be used by this invention. It is a figure for demonstrating the fixing method of the reinforced fiber sheet in the reinforcement method of the conventional structure. It is a figure for demonstrating the fixing method of the reinforced fiber sheet in the reinforcement method of the conventional structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforcing fiber sheet 2 Reinforcing fiber 3 Support body 4 Reinforcing fiber layer 5 Anti-separation fiber 10 Reinforcing fiber sheet reinforcing material 20 Fixing body 21 Fixing body through hole 22 Anchor (fixing tool)
23 Support plate 100 Structure 101 Structure sticking surface 102 Structure side

Claims (13)

In a reinforcing method for reinforcing a structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials with a resin to the attachment surface of the structure,
(A) On the bonding surface of the structure, n sheets (n: an integer of 2 or more) of reinforcing fiber sheet reinforcing materials are stacked from the bonding surface of the structure to the outside, and bonded with a resin. And
(B) Wrapping both ends in the longitudinal direction of the reinforcing fiber sheet reinforcing material of each layer around a rod-shaped fixing body arranged orthogonal to the longitudinal direction of the reinforcing fiber sheet reinforcing material, and bonding with a resin;
(C) The rod-shaped fixing member is changed from the innermost layer reinforcing fiber sheet reinforcing material attached to the attachment surface of the structure to the nth reinforcing fiber sheet reinforcing material attached to the outermost layer. Sequentially located inward and fixed to the structure with a fixture,
A method of reinforcing a structure characterized by the above. In a reinforcing method for reinforcing a structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials with a resin to the attachment surface of the structure,
(A) a step of adhering a first-layer reinforcing fiber sheet reinforcing material to a bonding surface of the structure with a resin;
(B) The first rod-shaped fixing members disposed at the both ends in the longitudinal direction of the first-layer reinforcing fiber sheet reinforcing material at right angles to the longitudinal direction of the first-layer reinforcing fiber sheet reinforcing material. Winding, bonding with resin,
(C) fixing the first rod-shaped fixing body to the structure with a fixture;
(D) a step of laminating the first-layer reinforcing fiber sheet reinforcing material bonded to the attachment surface of the structure and attaching the second-layer reinforcing fiber sheet reinforcing material;
(E) The longitudinal length of the second-layer reinforcing fiber sheet reinforcing material in an inner region from the two first rod-shaped fixing bodies that fix both ends of the first-layer reinforcing fiber sheet reinforcing material A step of winding both ends in the direction around a second rod-shaped fixing member disposed perpendicular to the longitudinal direction of the reinforcing fiber sheet reinforcing material of the second layer, and bonding with a resin;
(F) a step of fixing the second rod-shaped fixing body to the structure with a fixture;
A method for reinforcing a structure, characterized by comprising: In a reinforcing method for reinforcing a structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials with a resin to the attachment surface of the structure,
(A) On the bonding surface of the structure, n sheets (n: an integer of 2 or more) of reinforcing fiber sheet reinforcing materials are arranged adjacent to each other in parallel and bonded with a resin,
(B) Wrapping both ends of the n reinforcing fiber sheet reinforcing members in the longitudinal direction around the rod-shaped fixing members arranged perpendicular to the longitudinal direction of the reinforcing fiber sheet reinforcing material, and bonding them with a resin;
(C) fixing the rod-shaped fixing body to the structure with a fixture;
A method of reinforcing a structure characterized by the above. Furthermore, (d) affixing at least one reinforcing fiber sheet reinforcing material orthogonal to the n reinforcing fiber sheet reinforcing materials bonded to the attachment surface of the structure,
(E) Each of the longitudinal ends of the orthogonal reinforcing fiber sheet reinforcing material is wound around a rod-shaped fixing body arranged orthogonal to the longitudinal direction of the orthogonal reinforcing fiber sheet reinforcing material, and adhered with a resin,
(F) fixing the rod-shaped fixing body to the structure with a fixture;
The method for reinforcing a structure according to claim 3. In a reinforcing method for reinforcing a structure by adhering a plurality of elongated reinforcing fiber sheet reinforcing materials with a resin to the attachment surface of the structure,
(A) a step of adhering a first reinforcing fiber sheet reinforcing material to a sticking surface of the structure with a resin;
(B) Wrapping both ends in the longitudinal direction of the first reinforcing fiber sheet reinforcing material around the first rod-shaped fixing members arranged perpendicular to the longitudinal direction of the first reinforcing fiber sheet reinforcing material, and using resin Bonding process,
(C) fixing the first rod-shaped fixing body to the structure with a fixture;
(D) The second reinforcing fiber sheet reinforcing material is used as a resin adjacent to and in parallel with the first reinforcing fiber sheet reinforcing material bonded to the bonding surface of the structure on the bonding surface of the structure. Bonding process,
(E) Both ends of the second reinforcing fiber sheet reinforcing material in the longitudinal direction are respectively wound around second rod-shaped fixing members arranged orthogonal to the longitudinal direction of the second reinforcing fiber sheet reinforcing material, Bonding process,
(F) a step of fixing the second rod-shaped fixing body to the structure with a fixture;
A method for reinforcing a structure, characterized by comprising: Further, (g) a step of bonding at least one reinforcing fiber sheet reinforcing material orthogonal to the first and second reinforcing fiber sheet reinforcing materials bonded to the attachment surface of the structure with a resin,
(H) a step of winding both ends of the orthogonal reinforcing fiber sheet reinforcing material in the longitudinal direction around the rod-shaped fixing members arranged orthogonal to the longitudinal direction of the orthogonal reinforcing fiber sheet reinforcing material, and bonding them with a resin;
(I) a step of fixing the rod-shaped fixing body to the structure with a fixture;
The method for reinforcing a structure according to claim 5, wherein:   The reinforcement of a structure according to any one of claims 1 to 6, wherein the rod-shaped fixing body is fixed to the structure with a fixture in a region where no reinforcing fiber sheet reinforcing material is present. Method.   The rod-shaped fixing member is an elongated member having a longitudinal axis perpendicular to the longitudinal direction of the reinforcing fiber sheet reinforcing material, and has a cross-sectional shape of a circle, an ellipse, an oval, or an arcuate corner. The method for reinforcing a structure according to claim 1, wherein the structure is a polygon.   The reinforcing fiber sheet reinforcing material is composed of at least one unidirectionally arranged reinforcing fiber sheet in which reinforcing fibers are arranged in one direction, or at least one reinforcing fiber sheet which is a sheet-like woven fabric formed of reinforcing fibers. The method for reinforcing a structure according to any one of claims 1 to 8, wherein:   The reinforcing fibers include PAN-based or pitch-based carbon fibers; metal fibers such as boron fibers, titanium fibers, and steel fibers; organic fibers such as aramid, PBO (polyparaphenylene benzbisoxazole), polyamide, polyarylate, and polyester; The method for reinforcing a structure according to claim 9, wherein the structure is used alone or in a hybrid mixed with a plurality of types.   11. The resin according to claim 1, wherein the resin is a room temperature curing type or a thermosetting type epoxy resin, a vinyl ester resin, an MMA resin, an unsaturated polyester resin, or a phenol resin. Method of reinforcing the structure.   The reinforcing fiber sheet reinforcing material is a resin non-impregnated sheet or a semi-cured prepreg sheet impregnated with a resin before being attached to the structure. The method for reinforcing a structure according to any one of items 11 to 11.   The method for reinforcing a structure according to any one of claims 1 to 12, wherein the structure is a concrete structure or a steel structure.

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