JP2002364185A - Method and device for tightening, bonding and reinforcing structure reinforcing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for easily bonding a reinforcing sheet to a structure while maintaining tension, and a device suited for implementing the method. SOLUTION: The bonding and reinforcing method reinforces a structure by affixing a reinforcing sheet 4 made from reinforcing fibers 3 to the surface 1a of the structure 1 while applying tension to the surface. Each end of the reinforcing sheet is securely bonded to a rigid roll 9 and at least one of the rolls is towed by a tension imparting means 8 so as to tension the reinforcing sheet. The reinforcing sheet tensioned between both rolls is pressed against the surface, under which state the reinforcing sheet is impregnated with an adhesive resin and bonded to the surface. After the resin has hardened, the traction force produced by the tension imparting means is released to make a cut 13 in the reinforcing sheet at its unbonded part. In the case of a cylindrical or rectangular structure, bonding can be achieved without use of pressing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete bridge such as a concrete bridge girder, a beam, a floor slab, a cylindrical structure, a convex structure or the like, which is mainly used for reinforcing a concrete structure. Method and apparatus.

[0002]

2. Description of the Related Art Conventionally, when concrete structures such as concrete bridge girders and beams, floor slabs, cylindrical structures, convex structures and the like have deteriorated in strength due to aging and the like, aromatic polyamide fibers and carbon fibers have been used. There is known a reinforcing method in which a reinforcing sheet made of a fiber having a strength greater than the tensile strength of concrete is bonded, and the stress applied to the structure is supported by the reinforcing sheet to improve the proof stress.

[0003]

The bending strength of the reinforcing sheet is improved when the reinforcing sheet is adhered in a tensioned prestressed state, rather than adhered to the surface of the structure as it is and withstands the bending stress applied thereto. Since the amount of deflection is reduced and the shear strength is also improved, a large reinforcing effect can be obtained even if the number of the reinforcing sheets is small. However, in order to adhere in such a tension holding state, the end portion of the reinforcing sheet b is sandwiched between steel plates a, a as shown in FIG. 1 and adhered, and this is pulled by a suitable tension applying means such as a jack. However, it is necessary to increase the sandwiching length L in order to increase the weight and the workability is poor, and to uniformly reinforce the reinforcing sheet and perform the reinforcing with good fixing efficiency.

An object of the present invention is to provide a method for easily bonding a reinforcing sheet to a structure while maintaining tension, and to provide an apparatus suitable for carrying out the method.

[0005]

According to the present invention, there is provided an adhesive reinforcing method for reinforcing a structure by attaching a reinforcing sheet made of reinforcing fibers while applying tension to the surface of the structure. Both ends of the reinforcing sheet are bonded and fixed to rigid rolls, respectively, and the reinforcing sheet is impregnated with an adhesive resin, and at least one of the two rolls is pulled by a tension applying means to tension the reinforcing sheet. The tensioned reinforcing sheet is pressed against the surface by pressing means from the outside to generate high tension, adheres to the surface in a pressed state, and after the adhesive resin is solidified, the traction force of the tension applying means is released to perform the reinforcement. The above object was achieved by cutting the sheet at the non-adhered portion. By pressing the reinforcing sheet against the surface with a pressing roll between the rolls, the reinforcing sheet is bonded in a state where an extremely high tension is generated, and a large prestress is generated in the structure.
According to the method of the present invention, a fixing base is provided on a side of a structure, and rolls are respectively bonded and fixed to both ends of a reinforcing sheet made of reinforcing fibers adhered to a surface of the structure to reinforce the structure. A tension applying device that pulls the reinforcing sheet in a direction along the surface to at least one of the tensioning devices and tensions the reinforcing sheet against the surface. Can be implemented.

Further, another method of the present invention can be applied to a cylindrical structure or a structure having a convex surface, and the means in this case is to reinforce the structure in a state where a tension is applied to the surface of the structure. In a method of bonding and reinforcing a structure by attaching a reinforcing sheet made of fiber, an end of a surface of the reinforcing sheet is bonded and fixed to a rigid roll, and the reinforcing sheet is impregnated with an adhesive resin. Are stacked along the surface of the structure having a cylindrical surface or a convex surface, and the two rolls are stretched and pressed against the surface while generating a high tension on the reinforcing sheet to adhere to the surface. The roll is removed by cutting the sheet. According to this means, high tension can be generated in the reinforcing sheet without using the pressing means.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIGS.
2 shows a structure made of a PC concrete bridge girder having a T-shaped cross-section cross-linked, and having a surface 1a having a strength greater than the tensile strength of concrete such as aromatic polyamide fiber or carbon fiber for reinforcement of the structure 1. The reinforcing sheet 4 made of the reinforcing fiber 3 having the following is bonded. The reinforcing sheet 4
Is to align the reinforcing fibers 3 in the reinforcing direction, and to use a shape retaining fiber such as vinyl for the weft in a direction orthogonal to the reinforcing direction to obtain a width 30 mm.
Knitted to ~ 50cm. In this case, the decrease in the strength of the structure 1 due to the aging of the concrete is caused by bonding the reinforcing sheet 4 to the lower surface in a state where the direction of the reinforcing fibers 3 matches the length direction of the structure 1 and tension is applied. Is prevented by doing so.

In order to attach the reinforcing sheet 4 in a state where a tension is applied, a fixing base 5 is attached to the abutment 2 on the side of the structure 1, and a tension jack 6 is attached to the fixing base 5 by an extendable rod 7. Tension applying means 8 attached to extend and contract in parallel with 1a is provided. The tension applying means 8 includes the structure 1
The reinforcing sheet 4 is also attached to the abutment on the other end (not shown), and both ends in the longitudinal direction of the reinforcing sheet 4 are attached to the respective extensible rods 7.
Is provided to the reinforcing sheet 4 arranged along.

When the reinforcing sheet 4 is scissorsed with a steel plate as described above, there are inconveniences such as a poor fixing efficiency and an increase in the weight of the apparatus. However, each end of the reinforcing sheet 4 is not shown in FIGS.
As shown in FIG. 5, a rigid roll 9 made of metal or the like is wound while being impregnated with a resin, and the impregnated resin is solidified to be in an adhered state. It was attached to the frame 10 of a shape. Reinforcement sheet 4
The roll 9 at one end may be attached to an immovable fixing member without being attached to the tension applying means 8.
To speed up the reinforcing work, the ends of the plurality of reinforcing sheets 4 may be wound and fixed.

The reinforcing sheet 4 is impregnated with an adhesive resin such as an epoxy-based, polyester-based, phenol-based or vinyl ester-based resin, and the roll 9 is used to impregnate the reinforcing sheet 4 with the surface 1a.
When a tension is applied along the surface, the reinforcing sheet 4
, The tensioned reinforcing sheet 4 between the two rolls 9, 9 is pressed against the surface 1a by a pressing device 11 composed of a pressing roll to solidify the adhesive resin.
Since the reinforcing sheet 4 is pressed from the outside by the pressing device 11 in a tension state, an extremely high tension is generated, and in this state, the reinforcing sheet 4 is firmly adhered to the surface 1a integrally. The impregnation of the adhesive resin is performed on the area of the reinforcing sheet 4 pressed by the pressing device 11, and after solidification, the traction force of the tension applying means 8 is released, and the reinforcing sheet 4 4 is cut 13. Then, on the surface of the reinforcing sheet 4 in which the adhesive resin is solidified, a finish coating of fluorine, acrylic urethane, polyurethane or the like is applied as necessary.

The reinforcing sheet 4 adheres to the structure 1 in a state of being tensioned by an extremely high tension, and the tension exerts a prestress on the structure 1, so that the bending strength of the structure 1 is improved and the amount of deflection is reduced. And the shear strength also increases. But,
When trying to obtain a reinforcing effect such as the same bending strength by bonding a reinforcing sheet that does not impart tension, the number of bonded reinforcing sheets must be greatly increased.
Poor workability. Further, since the reinforcing sheet 4 is bonded and fixed to the roll 9, the fixing efficiency is good and the fixing length is about the roll diameter.

As shown in FIG. 6, for example, the pressing device 11 has a roll-like structure which is rotatably attached to an arm 14 which is bolted to the structure 1 via a spring or a jack 15 to reinforce the surface 1a. The sheet 4 is pressed.

FIG. 7 shows a method of bonding the reinforcing sheet 4 to the peripheral surface of the cylindrical structure 20. Both ends of the reinforcing sheet 4 are bonded to the rolls 9, 9 as described above, A roller fixing device 21 is fixed in place at 20, and a tensioning jack 22 is fixed near the roller fixing device 21. The tensioning jack 22 has the same mechanism as the jack 6 shown in FIG. The roller fixing device 21 may be the same as the tension jack 22.

In the peripheral surface of the cylindrical structure, the reinforcing sheet 4
Is coated with an adhesive resin in the area where the contact is made, and the reinforcing sheet 4 is overlaid thereon.
9 and the jack 22 is actuated, a strong tension acts on the reinforcing sheet 4 and is strongly pressed against the peripheral surface.
The undercoat adhesive resin impregnates the reinforcing sheet 4. Then, if the same adhesive resin is overcoated, the impregnation is completed and the surface becomes smooth.

The impregnating means using the undercoat and the overcoat is also employed in the bonding method described with reference to FIGS.

FIG. 8 shows an example in which the reinforcing sheet 4 is adhered to a rectangular structure 25 as an example of a structure having a convex surface. The same roller fixing device 21 and tensioning jack 22 as those described in FIG. The reinforcing sheet 4 is mounted on the adhesive resin which is attached to the side surfaces 25a and 25b and is primed on the upper surface 25c, and after tension is applied to the rollers 9, 9, the topcoat is applied. Also in this case, bonding under high tension is performed without applying a pressing means to the reinforcing sheet 4.

[0017]

As described above, according to the present invention, both ends of a reinforcing sheet to be adhered by applying a tension for reinforcing a structure are bonded and fixed to rigid rolls, respectively. At least one of the rolls is pulled by the tension applying means to be pulled, and at the same time, the tensioned reinforcing sheet between the two rolls is pressed against the surface to generate a large tension and is adhered by the adhesive resin. Is released and the reinforcing sheet is cut at the non-adhered portion, so that there is an effect that the reinforcing sheet can be efficiently strengthened by applying a tension to the reinforcing sheet by the tension applying means with a simple and lightweight structure. The method of the present invention can be appropriately performed by using the apparatus having the configuration of 3.

Further, according to the method of the present invention, a high tension is generated on the reinforcing sheet without using a pressing means by pulling a roll at a surface end of the reinforcing sheet stacked along the cylindrical surface or the convex surface, Strong prestress can be generated in the structure.

[Brief description of the drawings]

FIG. 1 is a side view of an example of a fixing method of an end portion of a reinforcing sheet.

FIG. 2 is a partially omitted side view showing an embodiment of the present invention.

FIG. 3 is a bottom view of FIG. 2;

FIG. 4 is a perspective view of a roll mounted state.

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a sectional view taken along the line 6-6 in FIG. 2;

FIG. 7 is a plan view of an example of reinforcing a cylindrical structure.

FIG. 8 is a side view of an example of reinforcing a rectangular structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Structure 1a Surface 3 Reinforcement fiber 4 Reinforcement sheet 6 Tension jack 7 Telescopic rod 8 Tension giving means 9 Roll 11 Pressing device 13 Cutting

Claims (4)

[Claims] 1. A method of bonding and reinforcing a structure by attaching a reinforcing sheet made of reinforcing fibers to a surface of the structure while applying a tension to the surface of the structure, wherein both ends of the reinforcing sheet are rigid. Each of the rolls is bonded and fixed, and the reinforcing sheet is impregnated with an adhesive resin, and at least one of the two rolls is pulled by a tension applying means to tension the reinforcing sheet, and presses the tensioned reinforcing sheet between the two rolls by a pressing means. The surface is pressed against the surface from outside to generate high tension, adheres to the surface in the pressed state, and after the adhesive resin is solidified, the traction force of the tension applying means is released to release the reinforcing sheet at the non-adhered portion. A method for reinforcing a tension-adhesive structure of a structural reinforcing sheet, comprising cutting. 2. The tension bonding method for a structural reinforcing sheet according to claim 1, wherein the reinforcing sheet is pressed against the surface by a pressing roll between the rolls. 3. A fixing base is provided on the side of the structure, and rolls are respectively adhered and fixed to both ends of a reinforcing sheet made of reinforcing fibers adhered to the surface of the structure to reinforce the structure. A structural reinforcing sheet, comprising: a tension applying device that pulls and tensions at least one of the reinforcing sheets in a direction along the surface, and a pressing device that presses the tensioned reinforcing sheet against the surface. Tension adhesive reinforcement device. 4. A method of bonding and reinforcing a structure by attaching a reinforcing sheet made of reinforcing fibers to the surface of the structure while applying tension to the surface of the structure, wherein the end of the surface of the reinforcing sheet is fixed to a rigid roll. The adhesive sheet is fixed, the reinforcing sheet is impregnated with an adhesive resin, and the reinforcing sheet is stacked along the surface of a structure having a cylindrical surface or a convex surface, and both rolls are pulled to generate high tension on the reinforcing sheet. A method for bonding and reinforcing a structural reinforcing sheet, characterized in that, after the adhesive resin is solidified, the sheet near the roll is cut and the roll is removed.