JP7213751B2 - Reinforcing anti-corrosion structure and reinforcing anti-corrosion method for concrete structure - Google Patents

Description

The present invention relates to a structure and a method for applying both reinforcement and cathodic protection to a concrete structure.

Concrete structures may deteriorate due to various factors such as neutralization of concrete and salt damage. A deteriorated concrete structure requires repair or reinforcement, and a continuous fiber reinforcement method of attaching a sheet woven with continuous fibers, a reinforcement method of adding prestress, and the like are being used.
On the other hand, if the deterioration of concrete is due to salt damage, the deterioration may progress again after repair or reinforcement. For this reason, in order to suppress the corrosion of reinforcing bars due to salt damage, etc., electrodes are attached to concrete structures, and cathodic protection is performed by applying a voltage between the electrodes and the reinforcing bars.

It is unreasonable to perform the above reinforcement and cathodic protection separately in terms of construction period and cost, and simultaneous application of reinforcement and cathodic protection has been proposed, for example, in Patent Document 1 and Patent Document 2. there is
The method for reinforcing and preventing corrosion of a concrete structure described in Patent Document 1 uses a reinforcing/corrosion-proof material in which an FRP lattice material in which a fiber-reinforced resin is formed in a lattice shape and a net-like cathodic protection electrode are superimposed. . This reinforcing/corrosion-proofing material is fixed to the surface of the concrete structure using fasteners and covered with cement mortar.
Further, the method for reinforcing and preventing corrosion of a concrete structure described in Patent Document 2 includes a reinforcing portion formed of high-strength synthetic resin fibers that reinforces the structure, and an electrode that functions as an electrode, including a metal having conductivity. A reinforced anti-corrosion sheet woven into a continuous sheet is used. This reinforcing anti-corrosion sheet is fixed to the surface of the concrete structure.

JP 2007-39996 A JP 2010-222653 A

However, the conventional technology has the following problems that need to be solved.
As described in Patent Document 1, in the method of using a reinforcing/corrosion-proof material in which a reinforcing material and a cathodic protection electrode are superimposed, the reinforcing/corrosion-proof material is fixed to a concrete structure with fasteners or cement mortar. That is, in order to maintain the protective current between the reinforcing bar and the protective electrode, the protective electrode must be attached to the concrete structure via mortar or cement paste. However, when the reinforcing material is coated with mortar or the like, the adhesion strength to the concrete structure may be insufficient, and when the adhesion strength is insufficient, a large number of fasteners are required. For this reason, the amount of work for fixing the reinforcement/corrosion-proof material increases.
On the other hand, as described in Patent Document 2, in a method of attaching a sheet divided into a reinforcing portion and an electrode portion to a concrete structure, the electrode portion is brought into close contact with the concrete structure by cement mortar, and the reinforcing portion is adhered to the concrete structure. can be firmly attached using a synthetic resin adhesive. However, in order to apply the synthetic resin adhesive to the concrete structure excluding the portion to which the electrode portion abuts, it is necessary to repeatedly mask the portion to which the electrode portion abuts, resulting in poor workability.

The present invention has been made in view of the circumstances as described above, and an object of the present invention is to provide a concrete structure in which electrodes are adhered to the structure via mortar or cement paste and reinforcing fibers are firmly attached. To provide a reinforcing anti-corrosion structure and a method for reinforcing and anti-corrosion of a concrete structure capable of efficiently carrying out the work of adhering reinforcing fibers firmly while adhering electrodes to the structure via mortar or cement paste.

In order to solve the above problems, the invention according to claim 1 is a reinforced anti-corrosion structure that performs reinforcement of a concrete structure and cathodic protection of reinforcing bars used in the concrete structure, wherein the concrete structure is: A band-shaped anode member is pasted on the mortar layer or cement paste layer applied to the surface of the anode member, and a reinforcing fiber sheet woven with fibers continuous in two directions covers the anode member with a synthetic resin adhesive. affixed to the surface of the concrete structure,
A direct-current voltage is applied between the anode member and the reinforcing bar, and the reinforcing fiber sheet has a belt-shaped reinforcing fiber that continues in the axial direction of the anode member and reinforces the concrete structure. In the area overlying the member, it provides a reinforced anti-corrosion structure of the concrete structure that is more loosely woven than in the area flanking the anode member.

In this reinforcing anti-corrosion structure, corrosion of the reinforcing steel is suppressed by the DC voltage applied between the anode member and the reinforcing steel. The reinforcing fibers of the reinforcing fiber sheet attached to the surface of the concrete structure bear the tensile force acting near the surface of the concrete structure, thereby reinforcing the concrete structure. The reinforcing fiber sheet is firmly adhered to the concrete structure with a synthetic resin adhesive, and covers the anode member to protect the anode member from the external environment.
On the other hand, when the reinforcing fibers of the reinforcing fiber sheet bear the tensile force acting on the structure, there is a shear force between the reinforcing fibers and the surface of the concrete structure, which tends to shift the reinforcing fibers in the axial direction. works. The reinforcing fibers are loosely woven in the portion overlying the anode member. As a result, the shear force transmitted from the surface of the concrete structure to the reinforcing fibers via the mortar layer or cement paste layer and the anode member is reduced, and the separation of the anode member is suppressed.

The invention according to claim 2 is the reinforcing anticorrosion structure for a concrete structure according to claim 1, wherein in the reinforcing fiber sheet, lateral fibers continuous in a direction crossing the axis of the anode member are more tensile than the reinforcing fibers. The reinforcing fiber sheet has a small elastic modulus with respect to force, and the reinforcing fiber sheet is attached in a state in which a tensile force is introduced in a direction transverse to the anode member.

In the reinforced anticorrosion structure, the lateral fibers have a small elastic modulus and tend to stretch. When the lateral fibers are stretched and attached so as to cover the strip-shaped anode member, the tensile force of the lateral fibers pulls the strip-shaped anode member from both sides of the strip into the mortar layer or cement paste layer. A force acts to push it upward. This suppresses peeling of the anode member.

The invention according to claim 3 is the reinforcing anti-corrosion structure for a concrete structure according to claim 1 or claim 2, wherein in a region where the reinforcing fiber sheet is superimposed on the anode member, the reinforcing fiber sheet and the anode member A portion not coated with the synthetic resin adhesive is provided between them, or a plurality of permeable holes are provided in the layer of the synthetic resin adhesive that is applied.

When a DC voltage is applied between the anode member and the reinforcing bar, gas may be generated near the surface of the anode member. If this gas is shielded with a layer of synthetic resin adhesive, the pressure of the generated gas may separate the reinforcing fiber sheet and the anode member. In the reinforcing anti-corrosion structure according to the present invention, gas is released by providing air permeation holes in the area where the anode member is attached to which the synthetic resin adhesive is not applied or in the layer of the synthetic resin adhesive, thereby releasing the reinforcing fiber sheet. And peeling of the anode member is suppressed.

The invention according to claim 4 is a method for reinforcing a concrete structure and for cathodic protection of reinforcing bars used in the concrete structure, wherein mortar or cement paste is applied to the surface of the concrete structure. affixing a band-shaped anode member on the formed mortar layer or cement paste layer; and applying a synthetic resin adhesive to cover the anode member with a reinforcing fiber sheet woven using fibers continuous in two directions. and attaching the reinforcing fiber sheet to the surface of the concrete structure, wherein the band-shaped reinforcing fibers continuous in the axial direction of the anode member are overlapped on the anode member in the region where the A method for reinforcing and preventing corrosion of a concrete structure is provided in which the material is woven more roughly than the side area of the anode member and a DC voltage is applied between the anode member and the reinforcing bar.

In this reinforcing anti-corrosion method, the corrosion of reinforcing bars is suppressed, and the concrete structure is reinforced by the reinforcing fibers of the reinforcing fiber sheet attached to the surface of the concrete structure. Also, by covering the anode member with the reinforcing fiber sheet, it is possible to protect the anode member from the external environment. Furthermore, by using a reinforcing fiber sheet that is loosely woven in the portion where the reinforcing fibers are superimposed on the anode member, the anode member pasted on the mortar layer or the cement paste layer can be peeled off. can be suppressed.

The invention according to claim 5 is the method for reinforcing and preventing corrosion of a concrete structure according to claim 4, wherein the reinforcing fiber sheet has a modulus of elasticity against a tensile force of transverse fibers continuous in a direction crossing the axis of the anode member. , the reinforcing fibers are smaller than the reinforcing fibers, and are attached to the concrete structure in a state in which a tensile force is introduced in a direction transverse to the axis of the anode member.

In the above reinforced anticorrosion structure, the lateral fibers are likely to stretch, and by attaching the strip-shaped anode member in a stretched state so as to cover the strip-shaped anode member, the tensile force of the lateral fibers stretches the strip-shaped anode member into the mortar layer or cement. A pressing force acts on the paste layer. This suppresses peeling of the anode member.

The invention according to claim 6 is the method for reinforcing and preventing corrosion of a concrete structure according to claim 5, wherein the reinforcing fiber sheet is a band-shaped sheet having a width wider than that of the anode member, and both side edges of the reinforcing fiber sheet are A rod-shaped or plate-shaped stiffening member is attached along the edge of the reinforcing fiber sheet. It shall be.

In this reinforcing anti-corrosion structure, the strip-shaped reinforcing fiber sheet can be held in a state of being stretched in the width direction with a simple structure. Then, it is possible to create a state in which the tensile force in the width direction is introduced nearly evenly in the axial direction of the strip-shaped reinforcing fiber sheet. By attaching the reinforcing fiber sheet to which tensile force has been introduced in this way so as to cover the anode member, the reinforcing fiber sheet acts to press the band-shaped anode member onto the mortar layer or cement paste layer. becomes.

As described above, in the reinforcing anti-corrosion structure for a concrete structure of the present invention, the anti-corrosion anode member adheres to the structure through the mortar layer or the cement paste layer, thereby suppressing separation and strengthening the reinforcing fiber sheet. is pasted on. In addition, in the method for reinforcing and preventing corrosion of a concrete structure of the present invention, the work of adhering the positive electrode member to the structure with the mortar layer or the cement paste layer and firmly attaching the reinforcing fiber with the synthetic resin adhesive can be efficiently performed. It becomes possible.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic side view which shows an example of the concrete structure which can apply the reinforcement anticorrosion structure of this invention. 1. It is the schematic sectional drawing and bottom view which show the state which gave the reinforcement anti-corrosion structure of this invention to the concrete structure shown in FIG. It is an enlarged cross-sectional view showing the reinforced anticorrosion structure of the present invention and an enlarged bottom view showing the structure of the reinforcing fiber sheet used in the present invention. FIG. 2 is a schematic diagram showing an example of a state in which a reinforcing fiber sheet is attached by the reinforcing anticorrosion method of the present invention; FIG. 4 is a schematic diagram showing another example of a state when a reinforcing fiber sheet is attached by the reinforcing anticorrosion method of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic side view showing a bridge girder made of concrete, which is an example of a concrete structure to which the reinforced anticorrosive structure of the present invention can be applied. 2 is a schematic cross-sectional view of the bridge girder shown in FIG. 1 and a bottom view showing a state in which the reinforcing anti-corrosion structure of the present invention is applied to this bridge girder.
This bridge girder 1 spans two abutments 2 and 3, and has a cross-sectional shape of a plate girder having hollow holes as shown in FIG. In the reinforced anticorrosion structure of this embodiment, an anode member 11 is attached to the bottom surface of the bridge girder 1 and a reinforcing fiber sheet 12 is attached over the anode member 11 . A voltage is applied between the anode member 11 and the reinforcing bars 14 embedded in the bridge girder from the power supply device 13, and the weak current generated between the anode member 11 and the reinforcing bars 14 suppresses the oxidation of the reinforcing bars. In addition, the reinforcement fiber sheet 12 pasted on the anode member 11 is part of the tensile force acting on the vicinity of the lower edge of the bridge girder 1. and increase the bending strength of the bridge girder 1.

As shown in FIG. 2(b), the anode member 11 is a strip-shaped member that is long in the axial direction of the bridge girder 1, and is attached in a range from the vicinity of one bearing of the bridge girder 1 to the vicinity of the other bearing. The reinforcing fiber sheet 12 is a strip-shaped member wider than the anode member 11 , overlapped with the anode member 11 at substantially the central portion in the width direction, and attached to the bottom surface of the bridge girder 1 so as to cover the anode member 11 . there is A plurality of anode members 11 and reinforcing fiber sheets 12 attached in this way are arranged in the width direction of the bridge girder 1 .

As the anode member 11, a thin tape-shaped piece of titanium is used. In addition, it is also possible to use titanium coated with a platinum-based metal such as iridium or ruthenium. In addition, a conductive member having corrosion resistance can also be used.
The tape-shaped anode member 11 preferably has a width of about 5 mm to 100 mm, more preferably 10 mm to 60 mm. Moreover, it is desirable that the thickness be such that it can be flexibly deformed to the extent that it can be easily adhered even if the surface to be adhered has some unevenness.

As shown in FIG. 3(a), the anode member 11 is applied with cement paste or mortar on the bottom surface of the girder, and is attached so as to be in direct contact with the cement paste layer 15 or the mortar layer. Or it is held by the adhesive force of mortar.
When the bottom surface of the bridge girder 1 is deteriorated, the deteriorated portion is removed and repaired with mortar or concrete.

The reinforcing fiber sheet 12 uses aramid fibers as the reinforcing fibers 12a and nylon fibers as the horizontal fibers 12b, and is woven into a belt shape using the reinforcing fibers 12a as warps and the horizontal fibers 12b as wefts. That is, the aramid fibers, which are the reinforcing fibers 12a, are woven continuously in the axial direction of the belt-shaped reinforcing fiber sheet 12, and the nylon fibers having a smaller elastic modulus than the aramid fibers are used in the width direction of the reinforcing fiber sheet. It is A plurality of these fibers are bundled into strands, which are woven to form a reinforcing fiber sheet.

The reinforcing fibers 12a of the woven reinforcing fiber sheet 12 are not arranged uniformly in the width direction of the band-shaped reinforcing fiber sheet 12, but overlapped with the anode member 11 as shown in FIG. 3(b). In the central portion A, the interval is wider than in the portion B where the reinforcing fiber sheet 12 is directly attached to the bridge girders 1 . As a result, the amount of reinforcing fibers per predetermined width is smaller at the portion A overlapping the anode member 11 than at both sides thereof.
In the reinforcing fiber sheet 12, the warp yarns made of the reinforcing fibers are spaced roughly at the central portion A where the anode member 11 is overlapped, but the warp yarns at the portion where the anode member 11 is overlapped have the same or the same interval. It is also possible to use thin threads that are coarsened and that have fewer aramid fibers constituting the warp than the threads used on the sides.

The reinforcing fiber sheet 12 is attached so as to cover the anode member 11 using a synthetic resin adhesive. At this time, the synthetic resin adhesive is applied to the entire region B where the reinforcing fiber sheet 12 is in direct contact with the bottom surface of the bridge girder 1 on both sides of the anode member 11 and overlapped with the anode member 11 . A synthetic resin adhesive is applied to a part of the region A where the synthetic resin adhesive is applied, and a region C to which the synthetic resin adhesive is not applied is provided. Then, the reinforcing fiber sheet 12 is brought into contact with the bottom surface of the bridge girder 1 in a state in which tension is introduced in the width direction and stretched in the width direction, and is bonded. For example, an epoxy resin adhesive can be used as the synthetic resin adhesive.
When attaching the reinforcing sheet 12, instead of providing the portion C where the synthetic resin adhesive is not applied, the synthetic resin adhesive is applied to the entire region where the anode member 11 is overlapped, and after the application, the synthetic resin adhesive is applied. A permeable hole may be provided. The permeable holes can be formed by, for example, inserting a sharp-pointed member such as a needle after the synthetic resin adhesive has hardened to such an extent that it loses its fluidity.

On the reinforcing fiber sheet 12 attached to the bottom surface of the bridge girder 1, a paint for shielding ultraviolet rays is applied. As a result, deterioration of the aramid fibers forming the reinforcing fiber sheet due to ultraviolet rays can be suppressed.

In order to bond the reinforcing fiber sheet 12 to the bridge girder 1 while applying tension in the width direction, the following method can be adopted, for example.
As shown in FIG. 4, stiffening members 16 are temporarily attached to the reinforcing fiber sheet 12 along both side edges. The stiffening member 16 is continuous in the axial direction of the reinforcing fiber sheet 12 and has bending rigidity against bending along the surface of the reinforcing fiber sheet 12 . An elastic support metal fitting 17 made of a plate spring is elastically bent and both ends thereof are connected to the stiffening members 16, and the elastic repulsive force of the elastic support metal fitting 17 causes the two stiffening members 16 to separate from each other. act in the direction Such elastic support metal fittings 17 are attached at predetermined intervals in the axial direction of the reinforcing fiber sheet 12 . The intervals at which the elastic support metal fittings 17 are attached can be set so that tension is introduced in the width direction in a nearly uniform state to the reinforcing fiber sheet 12 without large deformation occurring in the stiffening member 16 .

Nylon fibers having a small elastic modulus are used for the weft threads of the reinforcing fiber sheet 12, and are easily stretched by introduction of tension. Therefore, as described above, tension in the width direction is introduced to the reinforcing fiber sheet 12 by the elastic support metal fittings 17, and the reinforcing fiber sheet 12 contacts and adheres to the bottom surface of the bridge girder 1 in a substantially uniformly elongated state. At this time, the portion to which the anode member 11 is attached protrudes from the bottom surface of the bridge girder 1 in a convex shape due to the thickness of the cement paste layer 15 or mortar layer and the anode member 11, and acts in the width direction of the reinforcing fiber sheet 12. A force acts in a direction to press the anode member 11 against the bottom surface of the bridge girder 1 due to the tension applied. Alternatively, the adhesive may be cured while pressing the reinforcing fiber sheet 12 against the bottom surface of the bridge girder 1 on both sides of the anode member 11 as indicated by the arrow a in FIG.

In the reinforced anti-corrosion structure in which the anode member 11 and the reinforcing fiber sheet 12 are superimposed and attached in this way, the voltage applied from the power supply 13 between the reinforcing bars 14 embedded in the concrete and the anode member 11 causes the voltage applied between the two to increase. A weak anti-corrosion current is generated in , and corrosion of the reinforcing bar 14 is suppressed. The reinforcing fiber sheet 12 attached so as to cover the anode member 11 bears a part of the tensile force acting near the lower edge of the bridge girder 1, thereby improving the resistance to bending of the bridge girder 1. - 特許庁

In addition, when the reinforcing fiber 12a arranged in the axial direction of the reinforcing fiber sheet 12 bears the tensile force, the tensile force is transmitted from the bottom surface of the bridge girder 1 to the reinforcing fiber sheet 12, so that the bottom surface of the bridge girder 1 and the reinforcing fiber sheet A shear force acts between 12 and . Then, force is transmitted from the bottom surface of the bridge girder 1 through the cement paste layer 15 or the mortar layer and the anode member 11 at the portion where the reinforcing fiber sheet 12 is superimposed and attached to the anode member 11 . However, the reinforcing fibers of the reinforcing fiber sheet 12 are sparsely arranged in the portion where the reinforcing fiber sheet 12 is laminated on the anode member 11, and the shearing force acting between the bottom surface of the bridge girder 1 and the reinforcing fiber sheet 12 is reduced. . As a result, the load on the portion where the anode member 11 is attached to the bottom surface of the bridge girder 1 via the cement paste layer 15 or the mortar layer is reduced. Therefore, separation of the anode member 11 is suppressed.

On the other hand, if an anti-corrosion current is generated between the reinforcing bar 14 and the anode member 11 , gas may be generated near the surface of the anode member 11 . If such gas is confined and accumulated in the reinforcing fiber sheet 12, it may cause the anode member 11 to peel off. However, when the reinforcing fiber sheet 12 is adhered, the area overlaid on the anode member 11 is provided with a portion where the synthetic resin adhesive is not applied, or is provided with permeable holes, and this portion is air permeable. It has. As a result, even if gas is generated near the surface of the anode member 11 , the gas is released through the reinforcing fiber sheet 12 , thereby suppressing separation of the anode member 11 .
In addition, the paint applied on the reinforcing fiber sheet 12 to block ultraviolet rays has air permeability in order to release the gas generated near the surface of the anode member 11, or the reinforcing fiber sheet is attached. Sometimes, it is desirable that the paint is not applied to the portion C which was not applied with the synthetic resin adhesive.

The reinforcing anti-corrosion structure and reinforcing anti-corrosion method for a concrete structure described above are one embodiment of the present invention, and the present invention is not limited to the above-described embodiment, and can be appropriately applied within the scope of the present invention. Embodiments can be changed and implemented.
For example, in the above embodiment, concrete bridge girders are reinforced and corrosion-protected. can be applied to various concrete structures that require
The dimensions, thickness, material, etc. of the anode member can be appropriately selected within the range in which it functions as an anode member. In addition, although the reinforcing fiber sheet uses aramid fibers as reinforcing fibers and nylon fibers as transverse fibers, it is not limited to these, and other fibers may be used. For the warp, for example, carbon fiber, mineral fiber, or the like can be used.

On the other hand, the direction, interval, manner, etc., in which the band-shaped anode member and the reinforcing fiber sheet are attached to the concrete structure can be appropriately designed according to the application, structure, etc. of the concrete structure. In general, it is desirable that the strip-shaped anode member and the reinforcing fiber sheet are pasted along the direction in which the tensile stress of the concrete structure is generated. In the above embodiment, one reinforcing fiber sheet is attached to one anode member so as to be overlapped. can be

Further, the elastic supporting metal fittings used when attaching the reinforcing fiber sheet with a tensile force applied in the width direction are not limited to those using leaf springs as shown in FIG. can be used, and for example, the one shown in FIG. 5 can also be used.
The elastic support fitting 18 comprises a rod-shaped support member 19, two movable arms 20 attached to the support member 19 and capable of moving in the axial direction of the support member 19, and the movable arms 20 connected to each other. and a coil spring 21 that applies a force in the separating direction. The two movable arms 20 are locked to stiffening members 16 attached near both side edges of the reinforcing fiber sheet 12, respectively, and the elastic repulsive force of the coil spring 21 exerts a tensile force in the width direction on the reinforcing fiber sheet 12. It has become.

1: Bridge girder, 2: Abutment, 3: Abutment,
Reference Signs List 11: Anode member 12: Reinforcement fiber sheet 12a: Reinforcement fiber 12b: Horizontal fiber 13: Power supply device 14: Reinforcement bar 15: Cement paste layer 16: Stiffening member 17: Elastic support fitting 18 : elastic support fitting, 19: support member, 20: movable arm, 21: coil spring

Claims (6)

A reinforced anti-corrosion structure that reinforces a concrete structure and provides cathodic protection for reinforcing bars used in the concrete structure,
A strip-shaped anode member is attached onto the mortar layer or cement paste layer applied to the surface of the concrete structure,
A reinforcing fiber sheet woven with fibers continuous in two directions is attached to the surface of the concrete structure with a synthetic resin adhesive so as to cover the anode member,
A DC voltage is applied between the anode member and the reinforcing bar,
In the reinforcing fiber sheet, the reinforcing fibers that are continuous in the axial direction of the belt-shaped anode member and reinforce the concrete structure are coarser in the region where the anode member is overlapped than in the region on the side of the anode member. A reinforced anti-corrosion structure for a concrete structure, characterized in that it is woven into. In the reinforcing fiber sheet, lateral fibers continuous in a direction crossing the axis of the anode member have a smaller elastic modulus with respect to tensile force than the reinforcing fibers,
2. The reinforcing anti-corrosion structure of a concrete structure according to claim 1, wherein said reinforcing fiber sheet is attached in a state in which a tensile force is introduced in a direction transverse to said anode member. In the region where the reinforcing fiber sheet is superimposed on the anode member, a portion is provided between the reinforcing fiber sheet and the anode member to which the synthetic resin adhesive is not applied, or the synthetic resin adhesive is applied. 3. The reinforcing anti-corrosion structure of a concrete structure according to claim 1 or 2, wherein a plurality of permeable holes are provided in the layer. A method of reinforcing a concrete structure and cathodic protection of reinforcing bars used in the concrete structure, comprising:
a step of applying mortar or cement paste to the surface of the concrete structure and attaching a strip-shaped anode member onto the formed mortar layer or cement paste layer;
attaching a reinforcing fiber sheet woven using fibers continuous in two directions to the surface of the concrete structure with a synthetic resin adhesive so as to cover the anode member;
The reinforcing fiber sheet is
The band-shaped reinforcing fibers continuous in the axial direction of the anode member are woven more coarsely in the region where the anode member is overlapped than in the region on the side of the anode member,
A method for reinforcing and preventing corrosion of a concrete structure, wherein a DC voltage is applied between the anode member and the reinforcing bar. The reinforcing fiber sheet is
The elastic modulus of the lateral fibers continuous in the direction crossing the axis of the anode member with respect to the tensile force is smaller than the reinforcing fibers,
5. The method for reinforcing and preventing corrosion of a concrete structure according to claim 4, wherein the anode member is attached to the concrete structure while a tensile force is introduced in a direction transverse to the axis of the anode member. The reinforcing fiber sheet uses a belt-shaped sheet having a width wider than that of the anode member,
attaching rod-shaped or plate-shaped stiffening members along both side edges of the reinforcing fiber sheet;
6. The concrete structure according to claim 5, wherein a repulsive force of the deformed elastic member imparts a force in a direction separating the stiffening members on both side edges from each other, thereby introducing tensile force to the reinforcing fiber sheet. Reinforcing anti-corrosion method for objects.

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