JP2003120042A - Reinforcing structure for concrete structure, and reinforcing construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure for a concrete member and a reinforcing construction method applicable regardless of the shape of the concrete member with good workability. SOLUTION: An FRP molded plate 1 is previously formed to cover the outer peripheral surface of a rectangular column part 4 without conflicting with wing wall parts 5. The FRP molded plate 1 is disposed at a part for reinforcing the rectangular column part 4 and fixed by filling a cavity part between the surface of the rectangular column part 4 and the FRP molded plate 1 using a filler. A plurality of through holes 5a are provided at constant spaces on both sides of tiein parts between a pair wing walls 5 and the column 4 within a height position range of a pair of FRP molded plates 1 being fixed. Anchors 2 are inserted, and the center part of each anchor 2 and the through hole 5a are placed to coincide with each other. Both end parts of the anchor 2 are respectively enlarged in sector shape, and sector parts 2a are impregnated with resin and stuck to each of both facing side end parts 1c of a pair of FRP molded plates 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for a concrete member which has good workability and can be applied regardless of the shape of the concrete member, and a reinforcing method.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a method for directly reinforcing a carbon fiber sheet 12 or a method for reinforcing a carbon fiber sheet 12 as shown in FIG.
Is molded with resin in advance to form the molded plate 13, and the pillar 14
A method is used in which the carbon fiber sheet 12 is attached to the connecting portion of the molding plate 13 via an adhesive after the filler 8 is filled in the space surrounding the concrete member.

[0003]

However, in the method of attaching the carbon fiber sheet 12, it is necessary to perform sanding as a base treatment in order to smooth the surface of the concrete member to which the carbon fiber sheet 12 is attached. The generation of dust was a problem. In addition, the method of forming the molded plate 13 by previously solidifying the carbon fiber sheet 12 with resin and surrounding the pillars 14 and the like and filling the gap with the filler 8 is as follows.
There is a problem that it can be applied only to independent columns and cannot be applied to other concrete members.

On the other hand, for example, as shown in FIG.
In order to reinforce the pillar 14 in the concrete structure having a shape in which sleeve walls are connected to each other, the carbon fiber sheet 12 is attached to the surface of the pillar 14 to be reinforced, and the fixing is formed by bundling the plurality of reinforcing fibers. There is a method of reinforcing the carbon fiber sheet 12 divided by the sleeve wall by connecting the carbon fiber sheet 12 by using the anchor 2 for the purpose of smoothing the surface to which the carbon fiber sheet 12 is attached. Since it was necessary to perform sanding as a base treatment, the generation of dust was a problem.

In view of the above circumstances, it is an object of the present invention to provide a reinforcing structure for a concrete structure, which has good workability and can be applied without being influenced by the shape of the concrete member, and a reinforcing method.

[0006]

A reinforcing structure for a concrete structure according to claim 1 comprises a first concrete member,
In the reinforcement of a concrete structure in which a second concrete member is connected, a FRP molded plate composed of fibers and resin arranged so as to cover the surface of the first concrete member to be reinforced. A plurality of reinforcing fibers having one end or a central part fixed to the second concrete member and the other end or both ends fixed to the vicinity of the end side of the FRP molded plate. It is characterized in that it is composed of a fixing anchor formed by bundling.

According to a second aspect of the present invention, there is provided a reinforcing method for a concrete structure, wherein an opening is provided at a joint between the first concrete member and the second concrete member to cover an outer peripheral surface of the first concrete member. The FRP molded plate is arranged as described above, a plurality of through holes are provided in the second concrete member, the fixing anchor is inserted through the through hole, and the central portion of the fixing anchor is fixed to the through hole. Both ends of the fixing anchor are fixed to both ends of the FRP molding plate through a resin so that both ends are spread out in a fan shape and the openings of the FRP molding plate are connected.

According to a third aspect of the present invention, there is provided a reinforcing method for a concrete structure, wherein an opening is provided at a joint between the first concrete member and the second concrete member to cover the outer peripheral surface of the first concrete member. The FRP molded plate is arranged in such a manner that a plurality of insertion holes are provided in the second concrete member, one end of the fixing anchor is inserted into the insertion hole, and the fixing anchor is fixed through a fixing material. The end portion of the fixing anchor is spread out in a fan shape, and the other end portion of the anchor for fixing is interposed with a resin so that the end portion located in the opening portion of the FRP molding plate and the second concrete member are connected to each other. And is fixed to the end of the FRP molded plate.

According to a fourth aspect of the present invention, there is provided a method for reinforcing a concrete structure, wherein the concrete structure has a shape such that the first concrete member is surrounded by the second concrete member. An FRP molded plate formed in a flat plate shape is arranged so as to cover the surface of the first concrete member surrounded by the above, and a plurality of insertion holes are provided in the second concrete member, and the anchor for fixing is provided in the insertion holes. One end of the FRP molded plate is inserted and fixed through a fixing material, and the other end is expanded in a fan shape so that all the edges of the FRP molded plate are connected to the second concrete member. In addition, the other end portion of the fixing anchor is fixed to the end side of the FRP molded plate through the resin.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a reinforcing structure for a concrete member and a reinforcing method according to the present invention will be described with reference to FIGS.
Will be explained. In the present invention, a reinforcing structure used for reinforcing a part of a concrete structure having a structure in which a second concrete member such as a wall or a slab is fixed to a first concrete member such as a pillar or a beam. And the reinforcement method.

The reinforcing structure of the concrete structure is FRP
The molding plate 1 and the fixing anchor 2 are combined. The FRP molded plate 1 is a composite of the fiber 1a and a resin and molded into a desired shape. The resin material used is an epoxy resin, a methacrylic resin, or the like that can maintain the strength by being composited with the fiber 1a. Any organic or inorganic resin may be used as long as it is available. Further, as the material of the fiber 1a, carbon fiber, aramid fiber, glass fiber, polyacetal fiber or the like is used.

The FRP molded plate 1 is arranged with the fibers 1a arranged in a direction orthogonal to a main bar arranged in a concrete member to be reinforced which constitutes a concrete structure.
Is solidified through resin so as to follow the outer peripheral shape of the member to be reinforced, and is molded.

FIG. 1 shows an example of a prism 3 with a sleeve wall, which is a concrete structure having a prism 4 as a first concrete member and a sleeve wall 5 as a second concrete member. The FRP molded plate 1 used to reinforce the prismatic portion 4 is shown. The F shown in FIGS. 1 (a) and 1 (b)
In the RP molded plate 1, the fibers 1a are arranged in a direction orthogonal to the main bars of the prismatic portion 4 that constitutes the prismatic portion 3 with a sleeve wall, and the prismatic portion 4 and the sleeve wall portion 5 are arranged so as not to contact the sleeve wall portion 5. Since the opening portion 15 is provided at the portion for connecting with, it has a U-shape so as to form a pair and cover only the prismatic portion 4.

Fibers 1b arranged in a direction orthogonal to the fibers 1a are further fixed to both side ends 1c located in the opening 15 of the FRP molded plate 1 through a resin. There is. The fiber 1b is provided at least in a portion to which the fixing anchor 2 is fixed later. The fibers 1b may be attached to the entire FRP molded plate 1 for the purpose of maintaining the shape of the FRP molded plate 1.

The FRP molded plate 1 is molded by arranging the fibers 1a in a direction orthogonal to the main reinforcing bars arranged in a concrete member to be reinforced which constitutes a concrete structure and at the same time. 1, the fiber 1 is attached to both end portions 1c to which fixing anchors 2 are attached later.
If the fiber 1b is arranged so as to face the direction orthogonal to a, the shape may be freely formed so as to cover the portion of the concrete member to be reinforced.

The fixing anchors 2 fixed to the both side ends 1c of the FRP molded plate 1 are bundles of carbon fiber strands and are generally used as a reinforcing member for concrete. When it is fixed to the FRP molded plate 1, the end portion is spread out in a fan shape and fixed through the resin. The fiber used for the fixing anchor 2 is not limited to the carbon fiber strand, and any fiber such as aramid fiber or glass fiber can be used as long as the force can be transmitted to the FRP molded plate 1. Below, the concrete structure reinforcement method of the concrete structure using the FRP molded plate 1 and the fixing anchor 2 will be described by using a concrete example.

(First Embodiment of the Invention) FIG. 2A
In addition, taking as an example a prism 3 with a sleeve wall, which is a concrete structure having a prism portion 4 as a first concrete member and a sleeve wall portion 5 as a second concrete member, the prism portion 4 of the prism 3 with a sleeve wall is reinforced. An example is shown below when desired.

In the first embodiment, the prism 3 with a sleeve wall provided with a pair of sleeve wall portions 5 penetrating the prism portion 4 is taken as an example, and reinforcement for reinforcing the prism portion 4 is taken. The construction method is shown below. The FRP forming a U-shaped pair along the outer peripheral surface of the prismatic portion 4 so that the outer peripheral surface of the prismatic portion 4 can be covered in advance without touching the sleeve wall portion 5.
The forming plate 1 is formed. The FRP molding plate 1 forming a pair is arranged in a portion of the prism 4 which is desired to be reinforced, and mortar is used as the filling material 8 to fill the space between the surface of the prism 4 and the FRP molding plate 1 to form a pair FRP molding. The plate 1 is fixed to the prism portion 4. Note that the filler 8 is not limited to mortar, and any material may be used as long as it can fill the void between the surface of the prismatic portion 4 and the FRP molded plate 1.

Thereafter, within the height position range in which the paired FRP molded plate 1 is fixed, the pair of sleeve walls 5 and the pillar 4 are provided.
A plurality of through-holes 5a are provided at regular intervals on both sides of the connecting portion with. As shown in FIG. 2A, the through hole 5a
The fixing anchor 2 is inserted into the fixing anchor 2, and the vicinity of the central portion of the fixing anchor 2 is aligned with the through hole 5a.

As shown in FIG. 1 (a), both ends of the anchor 2 for fixing, which is a bundle of carbon fiber strands, are spread out in a fan shape, and used to form the FRP molding plate 1 on the fan portion 2a. A pair of FRP moldings which are discontinuous in the outer peripheral direction are formed by impregnating a resin and fixing the fan portions 2a of the fixing anchors 2 to the opposite end portions 1c of the paired FRP molding plates 1 respectively. The plates 1 are integrally connected via the fixing anchor 2. Further, a fixing material may be injected into the through hole 5a to fix the fixing anchor 2 in the through hole 5a.

(Second Embodiment of the Invention) Next, the second embodiment
2 (b), the wall 7 which is the second concrete member is provided so as to come into contact with the first surface of the prismatic portion 4 which is the first concrete member face to face in FIG. 2 (b). Taking a prism with a wall 6 as an example, a reinforcing method for reinforcing the prism portion 4 is shown below. As described above, the portion of the prismatic portion 4 that comes into contact with the wall 7 is previously defined as the opening portion 1.
5, so that the three surfaces of the prismatic portion 4 can be covered,
The FRP molding plate 1 is molded into a U shape. The FR
The P-molded plate 1 is arranged on the portion of the prism 4 which is desired to be reinforced, and mortar is used as the filler 8 to form an outer peripheral surface of the prism 4 and FR.
The FRP molded plate 1 is fixed by filling the gap with the P molded plate 1.

After that, a plurality of through holes 7a are provided so as to be parallel to the mating portions on both sides of the wall 7 with the prism portion 4 within the height position range where the FRP molding plate 1 is fixed. Located parallel to both sides of the prism 4
A bundle of fixing anchors 2 is inserted into one of the through holes 7a. In the fixing anchors 2, the central portion of the fixing anchors 2 is exposed on the wall 7 side, and the prism portion from the wall 7 side is exposed. The fixing anchors 2 are arranged on both side surfaces of the fixing member 4 so that both ends thereof protrude. Similarly, the fixing anchors 2 are arranged in all of the two through holes 7a located in parallel on both sides of the prismatic portion 4.

After both ends of the fixing anchor 2 arranged in this manner are fanned out, the fanned portion 2a is impregnated with the same resin as that used for molding the FRP molding plate 1, and The fan portions 2a are fixed to both side end portions 1c of the FRP molding plate 1 on which the fibers 1b are arranged, and the fixing anchor 2 and the FRP molding plate 1 are integrated so as to be wound around a portion to be reinforced. Further, a fixing material may be injected into the through hole 7a to fix the fixing anchor 2.

(Third Embodiment of the Invention) Next, the first embodiment
Taking as an example a concrete structure in which the slab 10 which is the second concrete member is provided on the upper surface of the beam 9 which is the concrete member, FIG. 3 shows a reinforcing method for reinforcing the beam 9. As shown in FIG. 3 (a), an opening 15 is formed in the connecting portion with the beam 9 so that both side surfaces and the lower surface, which are exposed portions of the beam 9, can be covered in advance.
The FRP molded plate 1 is molded into a U-shape so that The FRP molded plate 1 is arranged at a portion of the beam 9 to be reinforced, and the FRP molded plate 1 and the beam 9 are filled with a filler 8.
The FRP molded plate 1 is fixed by filling the gap with the outer peripheral surface of the FRP molded plate 1.

Thereafter, a plurality of through holes 1 are arranged so that the FRP molded plate 1 is arranged in parallel with each other at the joints on both sides of the slab 10 with the beam 9 within the fixed length position range.
0a is provided. 2 positioned on both sides of the beam 9 in parallel
A bundle of fixing anchors 2 is inserted into one of the through holes 10a. However, as in the second embodiment, the fixing anchors 2 are inserted.
Is attached so that the central portion of the fixing anchor 2 is exposed on the slab 10 side, and both ends of the fixing anchor 2 project from the slab 10 side to both side surfaces of the beam 9, respectively. Similarly, the anchors 2 for fixing are arranged in all of the two through holes 10a located in parallel on both sides of the beam 9.

The fixing anchor 2 attached in this manner
After the both end portions of the FRP molding plate 1 are spread out in a fan shape, the fan portion 2a is impregnated with the same resin as used in forming the FRP molding plate 1, and the fan portions 2a are formed on both side end portions of the FRP molding plate 1. The fixing anchor 2 and the FRP molded plate 1 are integrated with each other so as to be wound around the beam 9. Further, a fixing material may be injected into the through hole 10a to fix the fixing anchor 2.

Another example of the method of attaching the fixing anchor 2 is shown in FIG. 3 (b). Similar to FIG. 3 (a),
The FRP molded plate 1 is molded in a U-shape so that an opening 15 is provided in a connecting portion with the beam 9 so that both side surfaces and a lower surface which are exposed portions of the beam 9 can be covered in advance. deep.

On the other hand, within the length range of the FRP molding plate 1 at the position where the FRP molding plate 1 is desired to be fixed, the fixing portion is fixed at a fixed interval at the mating portions of the slab 10 on both sides of the beam 9. A plurality of insertion holes 10b into which the other end of the anchor 2 can be inserted are provided. Next, the FRP molded plate 1 is placed on the portion of the beam 9 to be reinforced, and F is filled with the filler 8.
Fill the space between the RP molded plate 1 and the outer peripheral surface of the beam 9,
The FRP molded plate 1 is fixed.

After that, the other end of the fixing anchor 2 is inserted into the insertion hole 10b, the slab 10 and the fixing anchor 2 are fixed by using a fixing means, and one end is formed into a fan shape. After unfolding, the fan portion 2a is impregnated with the same resin as that used for forming the FRP molded plate 1, and the fan portion 2a is fixed to each of both side end portions 1c of the FRP molded plate 1.

(Fourth Embodiment of the Present Invention) Next, taking as an example a wall 11 provided with a beam 9 on the upper side, the prismatic section 4 on both sides and a slab 10 on the lower side, the wall 11 shown in FIG. The reinforcing method for reinforcing the is shown below. The FRP molded plate 1 so that it can cover the wall 11 to be reinforced in advance.
Is molded into a flat plate. At this time, the FRP molded plate 1 is
The fibers 1a are laminated and bonded so that the fibers 1a are oriented in two directions, a vertical direction and a horizontal direction. The bonding direction of the fibers 1a is not limited to this, and as long as the fibers 1a are stacked and bonded so as to face in two directions, they may intersect at an angle even if they do not intersect at right angles. It doesn't matter.

Further, insertion holes 9a, 4a and 10b are provided in the lower end portion of the beam 9 surrounding the wall 11, the wall side surface of the prismatic portion 4 and the upper surface of the slab 10, respectively. On the other hand, the filler 8 is applied to the wall 11 to be reinforced in advance, and the FRP molded plate 1 is attached and fixed so that air does not remain from the upper surface. The FRP molded plate 1 may be fixed at a predetermined position and the periphery may be sealed, and then the filler 8 or resin may be filled in the gap.

After this, the other end of the fixing anchor 2 is inserted into the insertion holes 9a, 4a, 10b and fixed using a fixing material. As a result, one end portion of the fixing anchor 2 serving as the fan portion 2a is projected to the wall side. This one end is spread out in a fan shape,
a is impregnated with resin, and the fan portion 2a is connected to the FRP.
The FRP molding plate 1 is integrated with the wall 11 by fixing the fibers 1b of the molding plate 1 to the surfaces of the four sides to which they are attached.

The embodiment of the present invention as described above is merely one example, and any form can be adopted without being limited to the present embodiment without departing from the spirit of the present invention. Needless to say.

According to the above construction, by combining the FRP molding plate 1 and the anchor 2 for fixing, the shape of the concrete member to be reinforced is not affected, and
In any case, it becomes possible to easily reinforce.

A through hole is provided in the second concrete member to insert the anchor 2 for anchoring, both ends of the anchor are spread out in a fan shape, and the anchor is attached to the FRP molding plate 1 attached to the first concrete to be reinforced. The FRP
Since the molding plate 1 and the anchor 2 for fixing are integrally fixed to the first concrete member and the second concrete member to be reinforced, not only the reinforcement accuracy is high, but also the construction is simplified and It is possible to prevent dust and the like from being generated because part of the concrete member does not need to be chipped or grounded.

The second concrete member is provided with an insertion hole to insert and fix the other end of the anchor 2 for fixing, and the one end of the FRP is attached to the first concrete to be reinforced. When the FRP molded plate 1 and the anchor 2 for fixing are integrated by being attached to the molded plate 1, the first concrete member to be reinforced and the second concrete member
Because it is fixed to the concrete member of, like the above,
Not only the reinforcement accuracy is high, but also the construction is simplified, and it is possible to prevent dust and the like from being generated because part of the concrete member is not chipped or grounded.

[0037]

According to the concrete member reinforcing structure of claim 1, in the reinforcement of the concrete structure in which the first concrete member and the second concrete member are connected to each other, FRP molded plate composed of fibers and resin arranged so as to cover the surface of one concrete member, and one end portion or the central portion is fixed to the second concrete member, and the other end portion ,
Alternatively, since both ends are composed of anchoring anchors formed by bundling a plurality of reinforcing fibers fixed near the edge of the FRP molded plate, the shape of the concrete structure to be reinforced depends on the shape. It is possible to easily reinforce in any case without being forced.

According to the concrete member reinforcing method of claims 2, 3, and 4, the first concrete member and
By providing an opening at the joint with the second concrete member,
An FRP molded plate is arranged so as to cover the outer peripheral surface of the first concrete member, a through hole is provided in the second concrete member, and the fixing anchor is inserted through the through hole, and the central portion of the fixing anchor. The end of the fixing anchor to each end of the FRP molded plate through a resin so that both ends are spread in a fan shape and the openings of the FRP molded plate are connected together. Establish. Further, an opening is provided at a joint between the first concrete member and the second concrete member, and an FRP molding plate is arranged so as to cover an outer peripheral surface of the first concrete member,
The concrete member is provided with an insertion hole, and one end portion of the fixing anchor is inserted into the insertion hole and fixed through a fixing material, and the other end portion is spread out in a fan shape.
The other end of the fixing anchor is fixed to the end of the FRP molding plate via a resin so that the end located at the opening of the RP molding plate and the second concrete member are connected to each other. To do. Furthermore, the concrete structure,
The first concrete member has a shape surrounded by the second concrete member, and is formed in a flat plate shape so as to cover one surface of the first concrete member surrounded by the second concrete member. An FRP molded plate is arranged, a plurality of insertion holes are provided in the second concrete member, one end of the fixing anchor is inserted into the insertion holes, and the fixing anchor is fixed through a fixing material, while the other end is also fixed. The FRP molded plate through a resin so that all the edges of the FRP molded plate and the second concrete member are connected to each other so that all the ends are spread in a fan shape. Since it is fixed at the edge of the, not only the reinforcement accuracy is high, but
In addition to simplifying the construction, it is possible to prevent dust and the like from being generated because part of the concrete member does not need to be chipped or grounded.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of reinforcement of a wall with sleeve according to the present invention.

FIG. 2 shows a cross section of reinforcement of a sleeved wall according to the invention.

FIG. 3 is a diagram showing an outline of reinforcement of a beam according to the present invention.

FIG. 4 is a diagram showing a wall reinforcing method according to the present invention.

FIG. 5 is a diagram showing an outline of reinforcement of a conventional independent column.

FIG. 6 is a diagram showing an outline of reinforcement of a conventional independent column.

FIG. 7 is a diagram showing an outline of conventional reinforcement of a column with sleeves.

[Explanation of symbols]

1 FRP molded plate 1a fiber 1b fiber 1c both sides 2 anchor for fixing 2a fan part 3 Pillar with sleeve wall 4 Prism 4a insertion hole 5 Sleeve wall 5a through hole 6 Pillar with sleeve wall 7 walls 7a through hole 8 Filling material 9 beams 9a insertion hole 10 slabs 10a through hole 10b insertion hole 11 walls 12 carbon fiber sheet 13 Molded plate 14 pillars 15 openings

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuo Inada             Shimizu Construction 1-3-2 Shibaura, Minato-ku, Tokyo             Within the corporation F term (reference) 2E164 AA05 AA11 BA06 CA01 CA15                 2E176 AA01 BB29

Claims (4)

[Claims] 1. Reinforcement of a concrete structure in which a first concrete member and a second concrete member are connected to each other, and the first concrete member to be reinforced is arranged so as to cover the surface of the concrete structure. FR composed of fiber and resin
A plurality of P-molded plates, one end or the center of which is fixed to the second concrete member, and the other end or both of the ends are fixed near the edges of the FRP-molded plate. A reinforcing structure for a concrete structure, comprising an anchor for fixing, which is formed by bundling reinforcing fibers of a book. 2. A reinforcing method using the reinforcing structure for a concrete structure according to claim 1, wherein an opening is provided at a joint between the first concrete member and the second concrete member, The FRP molded plate is arranged so as to cover the outer peripheral surface of the first concrete member, a plurality of through holes are provided in the second concrete member, and the fixing anchor is inserted through the through holes, and the center of the fixing anchor is inserted. The FR portion is fixed to the through hole, and both end portions are spread in a fan shape so as to connect the opening portions of the FRP molding plate.
A reinforcing method for a concrete structure, characterized in that both ends of the anchor for fixing are fixed to both ends of a P-shaped plate through a resin. 3. A reinforcing method using the reinforcing structure for a concrete structure according to claim 1, wherein an opening is provided at a joint between the first concrete member and the second concrete member, The FRP molded plate is arranged so as to cover the outer peripheral surface of the first concrete member, a plurality of insertion holes is provided in the second concrete member, and one end portion of the anchor for fixing is inserted into the insertion hole to fix the same. A second end of the FRP molding plate, the second end of which is fixed to the second end of the FRP molding plate by pressing the second end of the second end into a fan shape.
A method for reinforcing a concrete structure, characterized in that the other end of the anchor for anchoring is fixed to the end of the FRP molded plate through a resin so as to be connected to the concrete member. 4. A reinforcing method using the reinforcing structure for a concrete structure according to claim 1, wherein the concrete structure has a shape in which a first concrete member is surrounded by a second concrete member. The FRP molded plate formed in a flat plate shape is arranged so as to cover the surface of the first concrete member surrounded by the second concrete member, and a plurality of insertion holes are provided in the second concrete member. One end of the fixing anchor is inserted into the insertion hole and fixed through a fixing material, and the other end is expanded in a fan shape, and all the edges of the FRP molding plate and the first A reinforcing method for a concrete structure, characterized in that the other end of the anchor for anchoring is anchored to the end side of the FRP molded plate through a resin so that the anchor member can be connected to the second concrete member.