JPH1068234A - Fixing method for reinforcing material for repairing existing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the fixing effect of a reinforcing material by fastening both end sections of an anchor plate arranged astride the reinforcing material perpendicularly to the tensile force acting direction of the reinforcing material to an existing structure, and crimping the reinforcing material to the existing structure with the anchor plate formed with taper faces at both end sections. SOLUTION: When a floor slab 10 is to be repaired with a reinforcing material 12, the reinforcing material 12 formed with high-strength fibers such as carbon fibers into a sheet shape is bonded to the floor slab 10 so that the fiber direction coincides with the direction of the tensile force T of the floor slab 10. A strip-like anchor plate 14 made of a steel sheet and arranged perpendicularly to the fiber direction is stuck to the reinforcing material 12, and both end sections of the anchor plate 14 are fastened and fixed to the floor slab 10 via anchor bolts 16. Taper faces 18 are formed at both end sections of the upper face of the anchor plate 14 in the acting direction of the tensile force T, the anchor bolts 16 are fastened via taper washers 20, and face pressure is applied to the reinforcing material 12 by the anchor plate 14 to fix it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a reinforcing material for repairing an existing structure using high-strength fibers such as carbon fibers formed by processing into a sheet or a plate.

[0002]

2. Description of the Related Art Conventionally, when a structural member such as a pillar, a beam or a slab is damaged by an earthquake or the like in a RC building, the damaged portion is repaired. Is a method using a reinforcing material obtained by processing high-strength fiber such as carbon fiber into a sheet. The reinforcing member covers and repairs the existing structure by covering the damaged portion with an adhesive such as an epoxy resin.

However, it is difficult to obtain a sufficient reinforcing effect by simply attaching the reinforcing material with an adhesive, and a stronger fixing between the existing structure and the reinforcing material is required. As a fixing method of this reinforcing material, for example,
No. 77104 (Int. Cl. E04G 23/02) is used to reinforce a beam. Both ends of a reinforcing material for repair superimposed along a material axis direction are bonded. There is a method in which a reinforcing material for fixing is overlapped and adhered so as to straddle a side surface of a beam so as to be orthogonal to an intermediate portion of the reinforcing material for repair.

[0004]

However, in such a conventional fixing method of a reinforcing material, a fixing reinforcing material is mounted on a repair reinforcing material bonded to an existing structure as described above. It is difficult to secure the fixing of the reinforcing material itself even if the reinforcing material for repair is fixed by the reinforcing material for fixing. If the fixing of the reinforcing material is weakened, the fixing effect of the reinforcing material for repair will be weakened as a result.
Further, when the repairing reinforcing material slips between the repairing surface and the repairing surface, there is a problem that the fixing effect of the fixing reinforcing material is hardly obtained.

SUMMARY OF THE INVENTION In view of the foregoing, an object of the present invention is to provide a method of fixing a reinforcing material for repairing an existing structure, which can sufficiently obtain a fixing effect of the reinforcing material.

[0006]

In order to achieve the above object, a method of fixing a reinforcing material for repairing an existing structure according to the first aspect of the present invention is directed to a reinforcing material obtained by processing a high-strength fiber into a sheet or a plate. In a fixing method of a reinforcing material for repairing an existing structure, which is bonded to the repaired portion of the existing structure so as to cover and adhere to the repaired portion, a direction perpendicular to the tensile force acting direction of the reinforcing material bonded to the existing structure In the meantime, an anchor plate is disposed across the reinforcing member, and both ends of the anchor plate are fastened to the existing structure by fastening means, and the reinforcing member is pressed against the existing structure with the anchor plate. A tapered surface is formed at both ends of the anchor plate through which the fastening means is inserted, and the fastening force of the fastening means is applied to the tapered surface.

Preferably, the tapered surface is formed along a direction in which the reinforcing member acts on a tensile force.

According to a third aspect of the present invention, there is provided a fixing method of a reinforcing material for repairing an existing structure, wherein the reinforcing material obtained by processing a high-strength fiber into a sheet or a plate is used for fixing an existing structure such as a beam or a column. In a fixing method of a reinforcing material for repairing an existing structure which is covered and adhered to a repair portion, the reinforcing member adhered to a repair surface of the existing structure has a direction perpendicular to a tensile force acting direction of the reinforcing material. A U-shaped mounting bracket extending over a pair of side surfaces is placed over the reinforcing material, and both side surfaces of the mounting bracket are fastened to both side surfaces of the existing structure by fastening means, while the both side surfaces of the mounting bracket are attached to the reinforcing member. An inclined groove which is gradually inclined in a direction in which the mounting bracket is pressed against the repair surface is formed in the fastening means insertion portion.

It is preferable that the inclined groove is formed along a direction in which the reinforcing member acts on a tensile force.

Therefore, according to the first and second aspects of the present invention, since the both ends of the anchor plate disposed over the reinforcing member are fastened to the existing structure by the fastening means, the anchor plate can be securely fixed. As a result, fixing of the reinforcing material sandwiched between the anchor plate and the existing structure is reliably performed. Further, a tapered surface is formed on the anchor plate along the direction of the tensile force acting on the reinforcing member, and the fastening force of the fastening means is applied to the tapered surface. When the tensile force acts on the anchor plate, the anchor plate tends to move together with the reinforcement, and at this time, the tapered surface exerts a wedge action with the fastening means so that the anchor plate presses the reinforcement against the existing structure. Generates directional forces. For this reason, the surface pressure of the reinforcing member increases via the anchor plate due to the tensile force, and the fixing effect of the reinforcing member can be further enhanced. Therefore, a great effect can be exerted by applying the fixing method of the reinforcing material to the flat portion.

According to the third and fourth aspects of the present invention, a U-shaped mounting bracket is disposed over the reinforcing member from the repair surface to a pair of side surfaces of the existing structure, and both side surfaces of the mounting bracket are disposed. Since the fastening member is fastened to both sides of the existing structure by fastening means, the mounting member can be securely fixed, and the reinforcing member clamped between the mounting bracket and the existing structure Is surely fixed.
In addition, since the mounting bracket has an inclined groove formed in the fastening means insertion portion of the both side surfaces along the direction in which the reinforcing member acts on the mounting member, the mounting bracket can be secured by the tensile force acting on the reinforcing member. Since a force is generated in the direction of pressing the reinforcing member against the existing structure while being guided by the inclined groove while being restricted by the means, the surface pressure of the reinforcing member is increased through this mounting bracket to improve the fixing effect of the reinforcing member. Can be more enhanced.
Therefore, a great effect can be exhibited by applying this reinforcing material fixing method to existing structures such as beams and columns.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show a first embodiment of a method of fixing a reinforcing material for repairing an existing structure according to the present invention, FIG. 1 is a plan view of a fixing portion of the reinforcing material, and FIG.
FIG. 3 is an enlarged side view showing an operating state of a fixing portion of the reinforcing member.

The fixing method of this embodiment shows a case where the floor slab 10 is repaired with a reinforcing material 12, and the reinforcing material 12 is formed by processing a high-strength fiber such as carbon fiber into a sheet or a plate as in the related art. The formed one is used. That is, as shown in FIGS. 1 and 2, the reinforcing material 12 is attached to the repaired portion of the upper surface 10a of the floor slab 10 as an existing structure with an adhesive such as epoxy resin. Here, the reinforcing material 1
In FIG. 2, fibers are oriented in the left-right direction in the figure, and the fiber direction is made to coincide with the direction of the material axis of the floor slab 10 (the direction in which the tensile force T acts).

Next, after the reinforcing member 12 is attached, it is crossed so as to be perpendicular to the fiber direction of the reinforcing member 12, and the strip-shaped anchor plate 14 is attached to the reinforcing member 12.
And over the anchor plate 1 with adhesive
4 and the reinforcing member 12 are bonded and integrated, and both ends of the anchor plate 14 are fastened and fixed to the floor slab 10 via anchor bolts 16. The anchor plate 14 is formed of a steel plate, an FRP (fiber reinforced resin) plate, or the like. Further, the anchor bolt 16 is implanted in the floor slab 10.

On the upper surface of the anchor plate 14, there is formed a tapered surface 18 which gradually becomes thinner in a direction in which the tensile force T acts on the reinforcing member 12, that is, in the present embodiment, rightward in the drawing. It is. The tapered surface 18 may be formed at least at both ends of the anchor plate 14 through which the anchor bolt 16 is inserted.

The anchor bolts 16 are implanted in the floor slab 10. After the anchor bolts 16 are inserted through the mounting holes 14a of the anchor plate 14 into the portions protruding from the floor slab 10, the anchor bolts 16 A taper washer 20 having a tapered surface formed on the lower surface is inserted through the anchor bolt 16 and the anchor bolt 1
The nut 22 is screwed into 6. By tightening the nut 22 to the anchor bolt 16, the tightening force F is applied to the anchor plate 1 via the taper washer 20.
4 and the anchor plate 14 serves to
2, the reinforcing material 12 is fixed by applying a surface pressure. The mounting hole 14a of the anchor plate 14 has a larger diameter or a longer hole than the anchor bolt 16, and the anchor plate 14
2 can be slightly moved in the direction in which the tensile force T acts.

As described above, the reinforcing member 1 of the present embodiment
In the fixing method 2, the reinforcing material 12 attached to the repaired portion of the floor slab 10 is crimped by an anchor plate 14 in which both ends are fastened to an anchor bolt 16 with a nut 22. Therefore, both ends of the anchor plate 14 are securely fixed to the floor slab 10 via the anchor bolts 16 and the nuts 22.
The fixing of the reinforcing material 12 sandwiched between the anchor plate 14 and the floor slab 10 can be reliably performed.

On the upper surface of the anchor plate 14, there is formed a tapered surface 18 which gradually becomes thinner in the direction in which the tensile force T acts on the reinforcing member 12, and is tightened to the tapered surface 18 by a nut 22. Since the taper washer 20 is pressed, when the tensile force T acts on the reinforcing member 12 due to the bending deformation of the floor slab 10 or the like, the anchor plate 18 tends to move together with the reinforcing member 12 as shown in FIG. At this time, the tapered surface 18 exerts a wedge action between the tapered washer 22 and the anchor plate 14 to generate a force P in the direction of pressing the reinforcing member 12 against the floor slab 10. Accordingly, the surface pressure P of the reinforcing member 12 is further increased by the tensile force T as compared with a state in which the reinforcing member 12 is tightened by the nut 22, so that the fixing effect of the reinforcing member 12 can be further enhanced.

In this embodiment, the case where the floor slab 10 is repaired is shown as an example. However, the present invention is not limited to this, and the present invention can be applied to an existing structure having a flat repair surface, such as a wall.

FIGS. 4, 5, and 6 show a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. 4 is a side view of a fixing portion of the reinforcing material, FIG. 5 is a sectional view taken along line BB in FIG. 4, and FIG. 6 is an enlarged side view showing an operation state of the fixing portion of the reinforcing material.

That is, the fixing method of this embodiment shows a case where the beam 30 as an existing structure is repaired with the reinforcing material 12.
The reinforcing material 12 is attached with the lower surface 30a of the beam 30 as a repair surface. The reinforcing member 12 is arranged so that the fiber direction is the axial direction of the beam 30 (the left-right direction in FIG. 4). And beam 3
The mounting bracket 32 bent in a U-shape along the side surfaces 30b and 30c from the lower surface 30a of the zero is put on the reinforcing member 12, and the mounting bracket 32 and the reinforcing member 12 are bonded and integrated with an adhesive. Both side surfaces 32a and 32b of the mounting bracket 32 are inserted into anchor bolts 34 planted on the side walls 30b and 30c, and are tightened and fixed via nuts 36.

At the portion where the mounting bracket 32 is inserted into the anchor bolt 34, the inclined groove 38 is gradually formed in a direction in which the mounting bracket 32 is pressed against the lower surface 30a as the tensile force T acts on the reinforcing member 12. To form
The nut 36 is screwed and fastened to the anchor bolt 34 inserted into the inclined groove 38. At one end of the inclined groove 38, a rising groove 38a is formed continuously at the edges of the side surfaces 32a, 32b.
At the time of mounting, the anchor bolt 34 is connected to the rising groove 38.
a to be positioned in the inclined groove 38.

Therefore, the reinforcing member 12 in this embodiment is
In the fixing method of (1), both side surfaces 3 of the mounting bracket 32
While the anchor bolt 34 is inserted from the rising groove 38a formed in each of the mounting brackets 32a and 32b,
The anchor bolt 34 is positioned at one end of the inclined groove 38 so as to cover the reinforcing member 12 attached to the lower surface 30a of the “0”. By moving the mounting bracket 32 in the direction of the tensile force T acting on the reinforcing member 12, the mounting bracket 32 is guided by the inclined groove 38 that moves along the anchor bolt 34, and is pushed into the reinforcing member 12. It is pressed with force F. In this state, both side surfaces 32 of the mounting bracket 32
a, 32b are fastened and fixed to both side walls 30b, 30c of the beam 30 via nuts 36.

Accordingly, as the mounting bracket 32 is securely fixed to the beam 30 via the anchor bolt 34, the reinforcing member 12 clamped between the mounting bracket 32 and the beam 30 is fixed. Can be performed reliably.

Also, both side surfaces 3 of the mounting bracket 32
The inclined grooves 38 formed in the mounting brackets 3a and 32b are attached to the mounting bracket 3 in the direction in which the tensile force T acts on the reinforcing member 12.
2 is gradually inclined in the direction of pressing the lower surface 30 a of the beam 30, so that when the tensile force T acts on the reinforcing member 12, the mounting bracket 32 is guided by the inclined groove 38 by the anchor bolt 34 and the reinforcing member 12 Is generated in the direction of pressing the beam 30 against the beam 30. Therefore, the surface pressure P of pressing the reinforcing member 12 by the mounting bracket 32 can be increased, and the fixing effect of the reinforcing member 12 can be further enhanced.

In this embodiment, the case of repairing the beam 30 has been described as an example. However, the present invention is not limited to this, and can be applied to an existing structure having side surfaces on both sides of the repair surface, for example, a pillar or the like.

In any of the above embodiments,
Although the anchoring bolts 16 and 34 have been exemplified as the fastening means, the fastening means is not limited to this, and a conventional means having a similar function, such as a hole-in anchor or a butterfly, may be employed.

[0028]

As described above, in the fixing method of a reinforcing material for repairing an existing structure according to claims 1 and 2 of the present invention, the reinforcing material adhered to the repair surface of the existing structure is straddled. Both ends of the arranged anchor plate are fastened to the existing structure by fastening means, so that the anchor plate can be securely fixed, and between the anchor plate and the existing structure. The fixing of the reinforcing material to be pinched can be reliably performed.

Further, a taper surface is formed on the anchor plate along the direction of the tensile force acting on the reinforcing member, and the fastening force of the fastening means is applied to the tapered surface. The tapered surface exerts a wedge action,
Due to the pressing force of the reinforcing material generated on the anchor plate,
The fixing force can be further increased by increasing the surface pressure of the reinforcing material.

According to a third aspect of the present invention, there is provided a fixing method of a reinforcing material for repairing an existing structure, wherein the U-shaped mounting bracket extends from the repair surface to a pair of side surfaces of the existing structure. Is placed over the reinforcing material, and both sides of the mounting bracket are fastened to both sides of the existing structure by fastening means, so that the mounting bracket can be securely fixed. The fixing of the reinforcing material sandwiched between the bracket and the existing structure can be reliably performed. Also, since the mounting bracket has an inclined groove formed in the fastening means insertion portion on the both side surfaces along the direction of action of the tensile force of the reinforcing material, by the tensile force acting on the reinforcing material,
The mounting bracket is guided by the inclined groove while being regulated by the fastening means, and generates a force in the direction of pressing the reinforcing material against the existing structure, thereby increasing the surface pressure of the reinforcing material, and further increasing the fixing force of the reinforcing material. It has various excellent effects that it can be enhanced.

[Brief description of the drawings]

FIG. 1 is a plan view of a fixing portion of a reinforcing member according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is an enlarged side view of an operation state of a fixing portion of a reinforcing member according to the first embodiment of the present invention.

FIG. 4 is a side view of a fixing portion of a reinforcing member according to a second embodiment of the present invention.

FIG. 5 is a sectional view taken along line BB in FIG. 4;

FIG. 6 is an enlarged side view of an operation state of a fixing portion of a reinforcing member according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Floor slab 12 Reinforcement material 14 Anchor plate 16 Anchor bolt 18 Taper surface 20 Taper washer 30 Beam 30b, 30c Side wall 32 Mounting bracket 32a, 32b Side surface 34 Anchor bolt 38 Inclined groove

Claims (4)

[Claims] 1. A fixing method of a reinforcing material for repairing an existing structure in which a reinforcing material obtained by processing a high-strength fiber into a sheet shape or a plate shape is covered and bonded to a repair portion of the existing structure, An anchor plate is disposed across the reinforcement in a direction perpendicular to the direction of the tensile force of the reinforcement bonded to the existing structure, and both ends of the anchor plate are fastened to the existing structure by fastening means. While the reinforcing member is pressed against the existing structure with the anchor plate, tapered surfaces are formed at both ends of the anchor plate through which the fastening unit is inserted, and the fastening force of the fastening unit is applied to the tapered surface. A method of fixing a reinforcing material for repairing an existing structure, which is characterized in that it works. 2. The fixing method of a reinforcing material for repairing an existing structure according to claim 1, wherein the tapered surface is formed along a direction in which a tensile force acts on the reinforcing material. 3. A reinforcing material for repairing an existing structure in which a reinforcing material obtained by processing high-strength fiber into a sheet or plate shape is bonded to a repaired portion of an existing structure such as a beam or a column so as to cover and repair the existing structure. In the fixing method, a U-shaped mounting bracket extending over a pair of side surfaces is disposed over the reinforcing member in a direction perpendicular to a tensile force acting direction of the reinforcing member adhered to the repair surface of the existing structure, While both sides of the mounting bracket are fastened to both sides of the existing structure by fastening means, the mounting bracket is gradually pressed in the direction in which the mounting bracket is pressed against the repair surface on the fastening means insertion portions of both sides of the mounting bracket. A method for fixing a reinforcing material for repairing an existing structure, characterized by forming an inclined groove. 4. The apparatus according to claim 3, wherein the inclined groove is formed along a direction in which the reinforcing member acts on a tensile force.
The fixing method of a reinforcing material for repairing an existing structure according to the item (1).