JP4091953B2 - Cross-sectional repair structure of existing reinforced concrete structures - Google Patents

Description

  The present invention relates to a cross-sectional repair structure used for cross-sectional repair of a defective portion of an existing reinforced concrete structure.

  In recent years, in existing reinforced concrete structures, salt damage such as salt in the air and antifreezing agents penetrates from the concrete surface into the interior and corrodes the reinforcing bars. Therefore, in order to prevent further corrosion of the reinforcing bars for the existing reinforced concrete structures where corrosion of the reinforcing bars due to salt damage occurs, the concrete part (defects) where the salt (chloride ion) concentration is high is removed. In general, a cross-sectional repair work for repairing using a repair material is performed.

  Various methods have been proposed for repairing the cross-section of this existing reinforced concrete structure.For example, concrete can be completely buried inside the structure by removing and removing the concrete from the defective parts that have deteriorated due to corrosion of the reinforcing bars. After the exposed reinforcing bars are exposed, after applying a nitrite-based anticorrosive agent to the surface of the reinforcing bars, the repaired material for repairing the cross section is filled in the defect recesses where the concrete has been removed. .

  However, in the existing reinforced concrete structure repaired by the above-mentioned cross-section repair method, the rebar embedded in the existing straddle between the existing concrete material and the new repair material, and the existing concrete material In addition, a potential difference is generated on the surface of the reinforcing bar in contact with both the repair material and the new repair material, and the part in contact with one material becomes the anode and the part in contact with the other material becomes the cathode, and the macro cell corrosion of the reinforcing bar occurs.

  In order to suppress such macro-cell corrosion of reinforcing bars, a metal that is more basic than iron, which is the material of reinforcing bars, is used as a sacrificial anode and bonded to the reinforcing bar, and this sacrificial anode is corroded instead of the reinforcing bar. A construction method is known, and examples thereof include a corrosion prevention method described in Patent Document 1 and an anticorrosion method described in Patent Document 2.

In addition, according to the methods described in Patent Documents 1 and 2, since the sacrificial anode is used for a long period of time by suppressing passivation, the sacrificial anode is previously surrounded by a mortar containing an electrolyte containing a sufficient pH. Or a sacrificial anode previously coated with a porous cementitious mortar exhibiting high alkalinity is used.
JP-T 8-51581 JP2003-129671

  However, in the above-described anticorrosion method described in Patent Document 1, even if the sacrificial anode is surrounded by a highly alkaline mortar to suppress passivation, if the sacrificial anode is completely consumed by macrocell corrosion in a short period of time, Thereafter, there is a problem that it is impossible to expect the anticorrosion effect by the sacrificial anode.

  Further, in the above-described corrosion prevention method described in Patent Document 2, it is assumed that the sacrificial anode is consumed by macrocell corrosion in a short period of time as in the method described in Patent Document 1, so that the sacrificial anode can be replaced. However, there is a problem that the subsequent maintenance associated with the replacement of the sacrificial anode is extremely complicated.

  Therefore, the present invention has been made to solve the above-described problems, and an existing reinforced concrete structure capable of preventing corrosion of a reinforcing bar without complicated maintenance work over a long period of time after a cross-sectional repair of the existing reinforced concrete structure. The object is to provide a cross-sectional repair structure of an object.

In order to achieve this object, the cross-section repair structure of the existing reinforced concrete structure according to claim 1 is a concrete removal formed by removing the surface concrete in the defective part of the existing reinforced concrete structure until at least a part of the reinforcing bar is exposed. A sacrificial anode member that is attached so as to be conductive with respect to a reinforcing bar exposed from the concrete removing portion, and a repair material that is filled and cured in the concrete removing portion so as to enclose the sacrificial anode member The repair material is provided with a cross-section repairing member mixed with a rust preventive agent having a property of penetrating and diffusing into the existing reinforced concrete structure, and a protective member between the cross-section repairing member and the existing reinforced concrete structure is provided. Due to the concentration difference of the rust agent, the rust preventive agent passes from the cross-section repair member to the inside of the existing reinforced concrete structure over time. Together by being penetrated diffused, by the time the anticorrosion effect of the sacrificial anode member declines and forms a rust atmosphere by rust agent within the cross-section restoration part not only existing reinforced concrete structures.

  The cross-section repair structure of an existing reinforced concrete structure according to claim 2 is a concrete removal portion formed by removing surface concrete in a defective portion of an existing reinforced concrete structure until at least a part of the reinforcing bar is exposed, and the concrete removal portion thereof One end is connected to the rebar exposed from the lead, and the other end is led to the outside of the concrete removal part, and the repair material filled and cured in the concrete removal part is formed into the repair material. A cross-sectional repair member mixed with a rust preventive agent that penetrates and diffuses into the existing reinforced concrete structure, and a sacrificial anode attached to the outer surface of the cross-section repair member and connected to the other end of the conductor And a member.

  According to the cross-sectional repair structure of the existing reinforced concrete structure according to claim 1 or 2, the cross-section repair member is formed by curing the uncured repair material filled in the concrete removal portion, and this cross-section repair The part that was the concrete removal part is restored by the member. In addition, the rust preventive agent mixed in the cross-section repair member (repairing material) is changed from the cross-section repair member to the inside of the existing reinforced concrete structure due to the concentration difference of the rust preventive agent between the cross-section repair member and the existing reinforced concrete structure. It gradually penetrates and diffuses over time.

  Here, in the transition period in which the rust preventive agent penetrates and diffuses into the existing reinforced concrete structure, it is difficult to sufficiently exert the rust preventive effect of the rebar by the rust preventive agent. However, since the macro cell battery circuit (anticorrosion circuit) in which the anticorrosion current flows directly from the sacrificial anode member to the reinforcing bar or through the conductive wire is formed inside the cross-sectional repair member, the sacrificial anode member is corroded instead of the reinforcing bar. The corrosion of the reinforcing bars can be prevented even during the transition period when the rust inhibitor penetrates and diffuses.

  On the other hand, when the corrosion of the sacrificial anode member (dissimilar metal macrocell corrosion) progresses and the anticorrosive effect of the macrocell battery circuit declines, the rust inhibitor is sufficiently diffused and penetrated into the existing reinforced concrete structure. Therefore, the rust prevention atmosphere by the rust preventive agent is formed not only in the cross-section repair member but also in the existing reinforced concrete structure. Therefore, thereafter, the corrosion of the reinforcing bars is prevented by the action of the rust preventive agent, regardless of the rust preventive action of the sacrificial anode member. As a result, corrosion of the reinforcing bars can be prevented without complicated maintenance work for a long period after the cross-sectional repair.

  The cross-sectional repair structure for an existing reinforced concrete structure according to claim 3 is the cross-section repair structure for an existing reinforced concrete structure according to claim 1, wherein the sacrificial anode member is a reinforcing bar through a conductive adhesive or weld bead. It is attached to the outer periphery so as to be conductive.

  According to the cross-sectional repair structure of the existing reinforced concrete structure according to claim 3, the cross-section repair structure of the existing reinforced concrete structure according to claim 1 is operated in the same manner, and through an electrically conductive adhesive or weld bead. Since the sacrificial anode member is attached to the outer periphery of the reinforcing bar and the sacrificial anode member and the reinforcing bar are electrically connected to each other, it is not necessary to separately connect the sacrificial anode member and the reinforcing bar with a conductive wire, and the construction work is simplified. The Further, when the repair material is filled into the concrete removal portion to form the cross-sectional repair member, a situation where the conductor connecting the sacrificial anode member and the reinforcing bar is cut by an impact accompanying the repair material filling is naturally avoided.

  The cross-sectional repair structure of the existing reinforced concrete structure according to claim 4 is the cross-section repair structure of the existing reinforced concrete structure according to claim 2, wherein the sacrificial anode member is formed in a net-like body, It is spread and embedded on the surface, and in the embedded state, one side surface of the mesh body is exposed from the outer surface of the cross-sectional repair member.

  The cross-sectional repair structure for an existing reinforced concrete structure according to claim 5 is the cross-section repair structure for an existing reinforced concrete structure according to claim 2, wherein the sacrificial anode member is formed in a rod-shaped body, and the axial direction of the rod-shaped body Is embedded in the outer surface of the cross-sectional repair member so as to be along the outer surface of the cross-section repair member, and a part of the outer peripheral surface of the rod-shaped body is exposed from the outer surface of the cross-section repair member in the embedded state. It is what has been.

  According to the cross-sectional repair structure of the existing reinforced concrete structure according to claim 4 or 5, it acts in the same manner as the cross-section repair structure of the existing reinforced concrete structure according to claim 2, and the uncured filled in the concrete removal portion If the sacrificial anode member is embedded and attached to the outer surface of the repair material in a state, the sacrificial anode member is directly fixed and held by the cross-sectional repair member made of a cured product of the repair material after the repair material is cured. be able to. Therefore, it is not necessary to provide an accommodation recess for accommodating the sacrificial anode member on the outer surface of the cross-sectional repair member, and it is not necessary to separately bond the sacrificial anode member to the outer surface of the cross-section repair member. In addition, by making the sacrificial anode member into a rod-like body or a net-like body, the sacrificial anode member can be easily embedded in the outer surface of the uncured repair material.

The cross-sectional repair structure for an existing reinforced concrete structure according to claim 6 is the cross-section repair structure for an existing reinforced concrete structure according to any one of claims 1 to 5, wherein the sacrificial anode member is a single metal having a higher ionization tendency than the rebar. And made of zinc or a zinc alloy .

According to the cross-sectional repair structure of the existing reinforced concrete structure according to claim 6, the sacrificial anode member acts in the same manner as the cross-section repair structure of the existing reinforced concrete structure according to any one of claims 1 to 5, and the sacrificial anode member is zinc or It is a single metal formed of zinc alloy . For this reason, compared with the case where other metals are used as the sacrificial anode member, the corrosion expansion of the sacrificial anode member itself is suppressed, and the occurrence of cracks in the cross-section repair member and the existing reinforced concrete structure due to the corrosion expansion of the sacrificial anode member. It is suppressed.

  The cross-sectional repair structure for an existing reinforced concrete structure according to claim 7 is the cross-section repair structure for an existing reinforced concrete structure according to any one of claims 1 to 6, wherein the rust inhibitor has a passive film on the surface of the rebar. It has an ionic component to be formed, and further exhibits alkalinity when mixed with the repair material.

  According to the cross-sectional repair structure of the existing reinforced concrete structure according to claim 7, the cross-section repair structure of the existing reinforced concrete structure according to any one of claims 1 to 6 acts in the same manner and is included in the rust preventive agent. By the action of the ionic component, a passive film can be formed on the surface of the reinforcing bar to prevent corrosion of the reinforcing bar. Moreover, since the cross-sectional repair member formed of the repair material mixed with the rust preventive agent can be made alkaline, it prevents the formation of a passive film on the surface of the sacrificial anode member, and elution of metal ions from the sacrificial anode member Is promoted, and the decrease or disappearance of the anticorrosion current by the macrocell battery circuit is suppressed.

  The cross-sectional repair structure for an existing reinforced concrete structure according to claim 8 is the cross-section repair structure for an existing reinforced concrete structure according to any one of claims 1 to 7, wherein the repair material exhibits alkalinity in a cured state. .

  According to the cross-sectional repair structure of the existing reinforced concrete structure according to claim 8, the repair material itself works in the same manner as the cross-section repair structure of the existing reinforced concrete structure according to claim 1, and the repair material itself is in a cured state. Since it exhibits alkalinity, the cross-sectional repair member formed of a cured product of such a repair material is also alkaline.

  According to the cross-sectional repair structure of the existing reinforced concrete structure of the present invention, the macrocell formed by the dissimilar metal macrocell corrosion generated between the sacrificial anode member and the reinforcing bar during the transition period in which the rust-proof atmosphere by the rust preventive agent is formed. The battery circuit protects the reinforcing bars, and at the end of the corrosion of the sacrificial anode member by the macrocell battery circuit, a rust-proof atmosphere is formed inside the reinforced concrete structure by the rust preventive agent to prevent the reinforcing bars. Therefore, there is an effect that corrosion of the reinforcing bars can be prevented for a long time after the repair of the cross section without requiring complicated maintenance work such as replacement work of the sacrificial electrode as in the prior art.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a cross-sectional repair structure 1 according to an embodiment of the present invention, and FIG. 1 (a) is a cross-sectional view taken along the line AA of FIG. 1 (b). (b) is a longitudinal cross-sectional view in the BB line of Fig.1 (a). This cross-sectional repair structure 1 is a structure suitable for repairing a defective portion of an existing reinforced concrete structure 50, and mainly includes a concrete removal portion 2, a sacrificial anode member 3, and a cross-section repair member 4. .

  Here, the existing reinforced concrete structure 50 is a concrete structure in which a steel reinforcing bar 52 is embedded, and the surface of the reinforcing steel 52 from the reinforcing bar 52 to the concrete outer surface 50a is covered with a surface concrete 51 having a predetermined thickness. Yes. Further, in the reinforcing bar 52, the surface side reinforcing bar 52 (52a) extending in the left-right direction in FIG. 1A and the deeper side reinforcing bar 52 (52b) extending in the vertical direction in FIG. It is assembled in a state.

  As shown in FIG. 1, the concrete removing portion 2 partially removes the outer surface 50 a of the existing reinforced concrete structure 50 by removing and removing the surface concrete 51 in the defective portion of the existing reinforced concrete structure 50. It is a part. Further, the depth of the concrete removing portion 2 is set to such a size that approximately half of the outer side (left side in FIG. 1 (b)) of the rebar 52a on the surface layer side is exposed.

  This is because cracks in the concrete due to corrosion of reinforcing bars often occur in the approximate center of the reinforcing bar 52a on the surface layer side (approximately the center in the left-right direction of the reinforcing bar 52a shown in FIG. 1B). It is for removing. In addition, the defect part of the existing reinforced concrete structure 50 means the location where corrosion of the reinforcement 52 inside a concrete is recognized, and the corrosion of the reinforcement 52 is estimated, for example with a high chloride ion concentration.

  The sacrificial anode member 3 is directly attached to the reinforcing bar 52 a by being joined to the outer periphery of the reinforcing bar 52 a exposed from the concrete removing portion 2 via the weld bead 5. The sacrificial anode member 3 is formed of a single metal rod having a higher ionization tendency than the iron rebar 52, and preferably a zinc, zinc alloy, aluminum, or aluminum alloy metal rod that is less likely to expand and is inexpensively used. It is done.

  The sacrificial anode member 3 is electrically connected to the reinforcing bar 52a by directly contacting the outer periphery of the reinforcing bar 52a. Further, the welding bead 5 for attaching the sacrificial anode member 3 to the reinforcing bar 52a is obtained by locally heating and melting the joint between the sacrificial anode member 3 and the reinforcing bar 52a by gas welding or arc welding. It is formed by fusing the materials, and the sacrificial anode member 3 and the reinforcing bar 52a are joined so as to be electrically conductive.

  The cross-section repair member 4 is formed of a repair material that is filled and hardened in the concrete removal portion 2, and encloses the sacrificial anode member 3 that is attached to the reinforcing bar 52 a in the concrete removal portion 2 while encasing the concrete removal portion. The part that was 2 is backfilled and restored. Here, the repair material used for the cross-sectional repair member 4 is mainly composed of cement-based mortar, for example, and is mixed with a rust preventive having a property of penetrating and diffusing into the existing reinforced concrete structure 50 as an additive. ing.

  The rust preventive agent mixed in the cross-section repairing member 4 has an ionic component that forms a passive film on the surface of the reinforcing bar 52, and further exhibits alkalinity when mixed in the repair material. For this reason, a passive film is formed on the surface of the reinforcing bar 52 by the action of the ionic component contained in the rust preventive agent, and corrosion of the reinforcing bar 52 can be prevented. In addition, since the cross-sectional repair member 4 formed of the repair material mixed with the rust preventive agent can be made alkaline, the formation of a passive film on the surface of the sacrificial anode member 3 is prevented, and the metal from the sacrificial anode member 3 is prevented. The elution of ions is promoted, and the decrease or disappearance of the anticorrosion current due to the macrocell battery circuit is suppressed.

  Here, as the rust preventive agent, a water-soluble rust preventive agent which is mixed and dissolved in cement-based mortar which is a main component of the repair material is suitable, and among them, a passive film is formed on the surface of the reinforcing bar 52. From the point of having an ionic component and the point of including an alkali metal ion component that increases alkalinity by being added to the repair material, it is preferable to use a nitrite-based water-soluble rust preventive agent, particularly lithium nitrite. is there. In addition, a rust preventive agent is previously mixed with the repair material with the uncured state before being filled into the concrete removal part 2.

  In addition, various existing methods can be applied as a method of filling the concrete removal portion 2 with the repair material in order to form the above-described cross-sectional repair member 4. For example, the uncured repair material is removed from the concrete. A method of spraying onto the part 2 (spraying method) or a concrete formwork placed outside the concrete removal part 2 and injecting an uncured repair material between the concrete removal part 2 and the concrete formwork, A method (injection method) in which the removal unit 2 is filled and cured can be used.

  Next, a modification of the above embodiment will be described with reference to FIGS. Fig.2 (a) is a front view of the cross-section repair structure 20 of 2nd Example, FIG.2 (b) is sectional drawing in the BB line of Fig.2 (a). The cross-sectional repair structure 20 of the second embodiment is obtained by changing the form and arrangement position of the sacrificial anode member with respect to the cross-section repair structure 1 of the first embodiment described above. In the following, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

  As shown in FIG. 2A, in the cross-sectional repair structure 20 of the second embodiment, a sacrificial anode member 21 is spread and attached to the outer surface of the cross-section repair member 4, and the sacrificial anode member 21 is It is formed in a net-like body with an expanded metal or the like having through-holes that are roughly rhombus in front view. Further, as shown in FIG. 2B, the sacrificial anode member 21 is spread and embedded on the outer surface of the cross-sectional repair member 4, and is embedded in the outer surface of the cross-section repair member 4, It is directly fixed and held by the cross-sectional repair member 4. Further, the sacrificial anode member 21 is embedded in the outer surface of the cross-sectional repair member 4 and one side surface thereof is exposed from the outer surface of the cross-section repair member 4.

  In order to attach the sacrificial anode member 21 to the outer surface of the cross-sectional repair member 4 in this way, the sacrificial anode member 21 is embedded in the outer surface of the uncured repair material filled in the concrete removing portion 2. Specifically, after the concrete removal portion 2 is formed, a concrete mold is installed outside the concrete removal portion 2, and a sacrificial anode member 21 is installed in advance between the opposing surfaces of the concrete mold and the concrete removal portion 2, Then, a repair material is injected and filled between the concrete removing portion 2 and the concrete mold to form the cross-sectional repair member 4.

  The sacrificial anode member 21 is connected to one end of a conducting wire 22 and the other end of the conducting wire 22 is connected to a reinforcing bar 52a. The conductive wire 22 is a conductive metal such as an iron wire or a copper wire and has a smaller ionization tendency than iron, and is bonded to the reinforcing bar 52a using a quick-drying conductive adhesive 23. The same quick-drying conductive adhesive (not shown) is used to bond the sacrificial anode member 21 in a wound state.

  In order to lead the lead wire 22 to the outer surface of the cross-section repair member 4 in this way, after the concrete removal portion 2 is formed, before the concrete removal portion 2 is filled with the repair material, the reinforcing bars exposed from the concrete removal portion 2 are exposed. One end of the conductor 22 is connected to 52a, and the other end of the conductor 22 is led out to the outside of the concrete removal section 2, and the concrete removal section 2 is filled with a repair material in that state to repair the cross section. The member 4 is formed.

  FIG. 3 is a front view of the cross-sectional repair structure 30 of the third embodiment, and FIG. 3B is a cross-sectional view taken along the line BB of FIG. The cross-sectional repair structure 30 of the third embodiment is obtained by changing the form of the sacrificial anode member from a net-like body to a rod-like body with respect to the cross-section repair structure 20 of the second embodiment. Hereinafter, the same parts as those in the first embodiment are denoted by the same reference numerals, the same parts as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted. explain.

  As shown in FIG. 3A, the sacrificial anode member 31 is formed in a substantially straight rod-like body in front view, and as shown in FIG. 3B, its cross-sectional shape is formed in a substantially circular shape. . The sacrificial anode member 31 is embedded in the outer surface of the cross-section repair member 4 so that the axial direction thereof is along the outer surface of the cross-section repair member 4. A part is exposed from the outer surface of the cross-sectional repair member 4.

  As described above, the present invention has been described based on the examples.However, the present invention is not limited to the above examples, and within the scope of the present invention, the form of the sacrificial anode member, the composition of the repair material, Alternatively, it can be easily inferred that various improvements and modifications can be made with respect to the composition of the rust preventive or the construction method of the cross-sectional repair structure.

  For example, in the first embodiment, when the concrete removing portion 2 is formed, it has been described that the surface concrete 51 is removed to a depth at which substantially half of the outer side of the reinforcing bar 52a on the surface layer side (left side in FIG. 1B) is exposed. The depth of the concrete removing portion 2 is not necessarily limited to this, and depending on the corrosion state of the reinforcing bar 52, a position at which the outer surface (left side in FIG. 1 (b)) of the reinforcing bar 52a on the surface layer side is slightly exposed. The surface concrete 51 may be removed to a position where the entire surface side rebar 52a is exposed or a position where a part of the deep layer rebar 52b is exposed.

  In the first embodiment, one sacrificial anode member 3 is attached to the reinforcing bar 52a via the weld bead 5. However, the number of sacrificial anode members is not necessarily limited to this, and as required. The number may be increased as appropriate.

  In the first embodiment, the sacrificial anode member 3 is attached to the reinforcing bar 52a via the weld bead 5, but means for attaching the sacrificial anode member to the reinforcing bar is not necessarily limited to this. Instead, for example, the sacrificial anode member may be bonded with a conductive adhesive with the outer peripheral surface of the sacrificial anode member in contact with the outer peripheral surface of the reinforcing bar, or the sacrificial anode member may be adhered to the outer surface of the reinforcing bar on the surface side. In the state of contact, the sacrificial anode member may be fixed to the bottom surface of the concrete removing portion using a fixing anchor.

  In the second embodiment, the expanded metal is used as the mesh body used for the sacrificial anode member 21. However, the mesh body is not necessarily limited to this. For example, a punching metal or a metal mesh is used. There may be. Further, the conductive wire 22 may be either one coated with an insulating material or one without such a coating film.

It is sectional drawing which shows the cross-section repair structure which is one Example of this invention. (A) is a front view of the cross-sectional repair structure of 2nd Example, (b) is sectional drawing in the BB line of (a). (A) is a front view of the cross-sectional repair structure of 3rd Example, (b) is sectional drawing in the BB line of (a).

Explanation of symbols

1,20,30 Cross-section repair structure (cross-section repair structure of existing reinforced concrete structures)
2 Concrete removal part 3, 21, 31 Sacrificial anode member 4 Cross section repair member (cross section repair member, cured material of repair material)
5 Weld beads 22 Conductor 50 Existing reinforced concrete structure 51 Surface concrete 52 Rebar

Claims (8)

A concrete removal part formed by removing the surface layer concrete in the defective part of the existing reinforced concrete structure until at least a part of the reinforcing bar is exposed;
A sacrificial anode member attached so as to be conductive with respect to the reinforcing bar exposed from the concrete removing portion;
The sacrificial anode member is formed of a repair material that is filled and hardened in the concrete removal portion so as to encapsulate the sacrificial anode member, and the repair material is mixed with a rust preventive agent that has the property of penetrating and diffusing into the existing reinforced concrete structure. A cross-section repairing member ,
Due to the difference in concentration of the rust preventive agent between the cross-section repair member and the existing reinforced concrete structure, the rust preventive agent is permeated and diffused from the cross-section repair member into the existing reinforced concrete structure with time. By the time when the anti-corrosion effect of the anode member declines, not only the above-mentioned cross-section repair member but also the existing reinforced concrete structure forms a rust-preventive atmosphere with a rust preventive agent inside, and the cross-section repair of the existing reinforced concrete structure Construction. A concrete removal part formed by removing the surface layer concrete in the defective part of the existing reinforced concrete structure until at least a part of the reinforcing bar is exposed;
One end is connected to the reinforcing bar exposed from the concrete removal portion, and the other end is led to the outside of the concrete removal portion;
A cross-section repair member formed of a repair material filled in the concrete removing portion and cured, and a rust preventive agent having a property of permeating and diffusing into the interior of the existing reinforced concrete structure is mixed in the repair material;
A cross-sectional repair structure for an existing reinforced concrete structure, comprising a sacrificial anode member attached to the outer surface of the cross-section repair member and connected to the other end of the conducting wire.   The cross-sectional repair structure of an existing reinforced concrete structure according to claim 1, wherein the sacrificial anode member is attached to the outer periphery of the reinforcing bar through a conductive adhesive or a weld bead. .   The sacrificial anode member is formed in a mesh body, and is spread and embedded on the outer surface of the cross-sectional repair member. In the embedded state, one side surface of the mesh body is outside the cross-section repair member. The cross-sectional repair structure of an existing reinforced concrete structure according to claim 2, wherein the cross-section repair structure is exposed from the surface.   The sacrificial anode member is formed in a rod-shaped body, and is embedded in the outer surface of the cross-sectional repair member so that the axial direction of the rod-shaped body is along the outer surface of the cross-section repair member, and the embedded state 3. The cross-sectional repair structure for an existing reinforced concrete structure according to claim 2, wherein a part of the outer peripheral surface of the rod-shaped body is exposed from the outer surface of the cross-section repair member. 6. The cross-sectional repair of an existing reinforced concrete structure according to claim 1, wherein the sacrificial anode member is a single metal having a higher ionization tendency than a reinforcing bar and is made of zinc or a zinc alloy. Construction.   The rust preventive agent has an ionic component that forms a passive film on the surface of a reinforcing bar, and further exhibits alkalinity when mixed with the repair material. The cross-sectional repair structure of the existing reinforced concrete structure in any one of 6.   The cross-sectional repair structure of an existing reinforced concrete structure according to any one of claims 1 to 7, wherein the repair material exhibits alkalinity in a cured state.

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