JP4320040B2 - Cross-section repair structure of reinforced concrete structure - Google Patents

Description

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

  In existing reinforced concrete structures, salt in the air flying at the coast and anti-freezing agent sprayed inland adheres to the concrete surface and penetrates into the reinforced concrete structure. The salt damage that corrodes is a problem. In particular, corrosion of reinforcing steel bars due to salt damage causes an increase in the volume of the reinforcing steel bars placed in the reinforced concrete structure. It may cause a drop in the load resistance of the object.

  For this reason, various countermeasures have been proposed for reinforced concrete structures that have suffered corrosion due to salt damage.For example, cathodic protection methods using the galvanic anode method or external power supply method, desalination methods, cross-section repair methods Or the anticorrosion construction method using the sacrificial anode member only for salt damage countermeasures is used. For example, the cross-section restoration method, one of them, removes concrete parts (defects) with high salinity (chloride ions) concentration and repairs them using repair materials in order to prevent corrosion of the reinforcing bars. To do.

  Various other methods have also been proposed for this cross-section repair method, for example, by removing concrete by scraping and removing concrete that has deteriorated due to corrosion of the rebar, exposing the rebar completely embedded in the structure. Then, after applying a nitrite-based rust preventive agent to the surface of the reinforcing bar, there is a method of repairing by filling a repairing material for repairing a cross section into a defect recess where concrete is suspended.

  However, in the restoration of reinforced concrete structures by such a cross-section repair method, the reinforcing bars embedded inside the reinforced concrete structures exist in a state straddling the existing concrete material and the newly installed repair material. There is a potential difference on the surface of the rebar that is in contact with both the concrete 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, resulting in macrocell corrosion of the rebar. End up.

In contrast, the anticorrosion method, which is another salt damage prevention method, is a sacrificial anode member that uses a base metal (a metal with a high ionization tendency) than iron, which is the material of the rebar, in order to suppress such macrocell corrosion of the rebar. The sacrificial anode member is corroded in place of the reinforcing bar. For example, a corrosion prevention method described in Patent Document 1 and a corrosion prevention method described in Patent Document 2 have been proposed.
JP-T 8-51581 JP 2003-129671 A

  However, in the above-described anticorrosion method, in order to join the sacrificial anode member dedicated to salt damage countermeasures to the reinforcing bar, it is necessary to wrap and bind the metal wire led out from the sacrificial anode member body to the reinforcing bar. It is necessary to remove concrete from the back to the depth. Moreover, in order to securely fix the sacrificial anode member to the reinforcing bar, it is necessary to fill the back surface of the metal wire binding portion with mortar or the like. For this reason, the conventional anticorrosion method has a problem that the construction cost is increased, the construction period is extended, and other construction by-products such as concrete are also removed. Moreover, in order to remove concrete from the back of the reinforcing bar, it is necessary to remove the concrete by avoiding the location of the reinforcing bar, so the construction work is likely to be complicated, and as a result, the construction cost is further increased. There is a problem of becoming.

  In particular, in the case of a wide range of repair locations, the number of locations for the sacrificial anode member dedicated to salt damage countermeasures also increases, so that there is a problem that the workability of the construction is further lowered and the construction cost is further increased. . In the case of Patent Document 1, if the sacrificial anode member is consumed due to macrocell corrosion in a short period of time, there is a problem that it is impossible to expect the anticorrosion effect by the sacrificial anode member thereafter. Furthermore, in the case of Patent Document 2, the sacrificial anode member can be replaced. However, there is a problem that the subsequent maintenance accompanying such replacement of the sacrificial anode member is extremely complicated.

  Therefore, the present invention has been made to solve the above-described problems, and it is possible to easily install the sacrificial anode material. Further, after the cross-sectional repair of the reinforced concrete structure, it is complicated for a long period of time. An object of the present invention is to provide a cross-section repair structure of a reinforced concrete structure that can prevent corrosion of the reinforcing bar without maintenance work.

In order to achieve this object, the cross-sectional repair structure of a reinforced concrete structure according to claim 1 is a front view from the bottom of the concrete removal portion formed by removing the surface concrete in the defective portion of the reinforced concrete structure. A linear sacrificial anode material having a wire-like form attached along the rebar where the portion is exposed, and the linear sacrificial anode material in contact with the exposed front portion of the rebar so as to be energized A fixing member fixed in the concrete removing portion, and a cross-sectional repairing member formed of a repair material filled and cured in the concrete removing portion so as to enclose the linear sacrificial anode material fixed by the fixing member; and wherein the fixing member has an elastic spring that is fitted in Matagano state on the outer periphery of said reinforcing bars being exposed at the bottom of the concrete removal unit The linear sacrificial anode material is clamped between the fixing member and the reinforcing bar, and is fixed by the fixing member in a state where it is in contact with the outer periphery of the reinforcing bar so as to be energized. .

According to the cross-sectional repair structure of the reinforced concrete structure of the present invention , the cross-section repair member is formed by curing the uncured repair material filled in the concrete removal portion, and the cross-section repair member is a concrete removal portion. The location is restored. Since the macro cell battery circuit (corrosion protection circuit) through which the corrosion protection current flows from the linear sacrificial anode material to the reinforcing bar is formed inside the cross-section repair member, the linear sacrificial anode material corrodes instead of the reinforcing bar, Rebar corrosion is prevented.

  Here, since the linear sacrificial anode material is in the form of a wire, it is exposed from the bottom surface of the concrete removing portion by being brought into contact with the surface of the front portion of the reinforcing bar exposed on the bottom surface of the concrete removing portion. It is also possible to easily stretch the linear sacrificial anode material around the reinforcing bar. For this reason, it is possible to arrange the sacrificial anode material to be entirely or continuously energized with respect to the reinforcing bars exposed from the concrete removing portion, and to spread the anticorrosion effect of the linear sacrificial anode material to the entire concrete removing portion. Furthermore, the installation mode of the linear sacrificial anode material can be easily changed according to the shape of the damaged portion.

  Moreover, since the shape of the linear sacrificial anode material is a wire shape, when it is fixed in the concrete removal portion in a state where it can be energized to the surface of the front part of the reinforcing bar, for example, an adhesive having conductivity, Concrete nails or staples, wire retainers or other wiring fixtures can also be used as fixing members, and the linear sacrificial anode material can be easily fixed in the concrete removal section without wrapping around the reinforcing bar using metal wires. can do.

  For example, a linear sacrificial anode material having a wire-like form is bonded directly to the surface of the front part of a reinforcing bar using a conductive adhesive, or a concrete nail is driven into a concrete surface in a concrete removal portion, and the concrete The head part of the nail may be struck and bent, and the bent part may be pressed against the surface of the front part of the reinforcing bar and fixed.

  In addition, for example, the linear sacrificial anode material is fixed by pressing the staple on the concrete surface in the concrete removal portion and striking the surface of the reinforcing bar, straddling the rebar in contact with the linear sacrificial anode material, Alternatively, a concrete tapping screw may be driven into the concrete surface in the concrete removal portion to fix a wire retainer or other wiring fixture, and the wiring fixture may be pressed against the surface of the front portion of the reinforcing bar. .

By adopting a method in which the sacrificial anode is fixed using a fixing member in this way, the surface concrete is suspended to the depth of the back of the rebar to fix the metal wire around the rebar as in the conventional sacrificial anode member. There is no need to remove it. Therefore, the removal work of surface concrete is simplified, and the amount of construction by-products such as concrete to be removed is also reduced, so that construction costs can be further eliminated, the construction period can be shortened, and resources can be saved. Can do .

In particular, according to the sectional repair structure of reinforced concrete structures according to claim 1, the linear sacrificial anode material because it is sandwiched between the elastic spring member and the reinforcing bar itself, which is fitted to the reinforcing bars outer periphery, linear sacrificial anode A material and a reinforcing bar can be made to contact reliably and the energization state between both can be ensured easily. Moreover, since the elastic spring member is externally fitted and attached to the outer periphery of the reinforcing bar using its own elastic restoring force, the concrete nails, staples, or tapping screws for concrete are driven into the concrete surface of the concrete removing portion. The linear sacrificial anode material can be fixed quickly and easily as compared with the fixing member.

The cross-sectional repair structure of a reinforced concrete structure according to claim 2 is the cross-section repair structure of a reinforced concrete structure according to claim 1 , wherein the reinforced concrete structure includes a surface layer reinforcing bar arranged on the surface layer side of the reinforced concrete structure and its surface layer. A deep layer reinforcing bar arranged deeper than the partial reinforcing bar and in contact with and intersecting with the surface layer reinforcing bar, and the concrete removing portion is substantially the same as the position where the front portion of the deep layer reinforcing bar is exposed. The front portion of the deep layer reinforcing bar is exposed from the bottom surface of the concrete removing portion, and the linear sacrificial anode material is attached along the deep layer reinforcing bar, and the deep layer reinforcing bar and At the intersection of the surface layer reinforcing bars, the surface layer reinforcing bars are crossed along the outer periphery of the surface layer reinforcing bars, and the fixing member is attached to the linear sacrificial anode material. That the portion of the form that overcome the surface layer portion reinforcing bars, is intended to attach with respect to the surface portion rebar.

  The cross-sectional repair structure of a reinforced concrete structure according to claim 3 is a concrete removing portion formed by removing surface concrete in a defective portion of the reinforced concrete structure, and a reinforcing bar whose front portion is exposed from the bottom surface of the concrete removing portion. A linear sacrificial anode material having a wire-like form attached along the wire sacrificial anode material, and the linear sacrificial anode material is fixed in the concrete removing portion in a state where the linear sacrificial anode material is in contact with the exposed front portion of the reinforcing bar so as to be energized. A reinforced concrete structure comprising: a fixing member; and a cross-sectional repairing member formed of a repair material filled and cured in the concrete removing portion so as to encapsulate the linear sacrificial anode material fixed by the fixing member Objects are arranged on the surface layer side of the reinforced concrete structure, and the surface layer is arranged deeper than the surface layer reinforcement. A deep-layer rebar that contacts and intersects with the reinforcing bar, and the concrete removing portion has a depth that is substantially equal to a position where the front portion of the deep-layer reinforcing bar is exposed, The front portion of the deep layer reinforcing bar is exposed from the bottom surface, and the linear sacrificial anode material is provided along the deep layer reinforcing bar, and the surface layer portion at the intersection of the deep layer reinforcing bar and the surface layer reinforcing bar. The surface layer reinforcing bar is crossed along the outer periphery of the reinforcing bar, and the fixing member takes a portion of the linear sacrificial anode material that crosses the surface layer reinforcing bar from the surface layer reinforcing bar. It is what you wear.

In particular, according to the cross-sectional repair structure of the reinforced concrete structure according to claim 2 or claim 3 , when the linear sacrificial anode material is attached along the deep layer reinforcing bar, the linear sacrificial anode material is used as the surface layer reinforcing bar. At the intersection of the steel layer and the deep layer reinforcing bar, the surface layer reinforcing bar is crossed along the outer periphery of the surface layer reinforcing bar. For this reason, the linear sacrificial anode material is in a state in which the linear sacrificial anode material can be energized with the surface layer reinforcing bar by attaching the portion of the linear sacrificial anode material that has been formed over the surface layer reinforcing bar to the surface layer reinforcing bar by the fixing member. While in contact, it is fixed in the concrete removal section.

  Here, since the surface layer reinforcement and the deep layer reinforcement are placed in contact in the reinforced concrete structure, the linear sacrificial anode material is simply contacted to the outer periphery of the surface layer reinforcement and fixed. The anode material can be in a state where it can be energized with both the surface layer reinforcing bar and the deep layer reinforcing bar. For this reason, a macro cell battery circuit can be formed in which a corrosion protection current flows from the linear sacrificial anode material to both the surface layer reinforcement and the deep layer reinforcement, and the linear sacrificial anode material is corroded on behalf of both the surface layer reinforcement and the deep layer reinforcement. Thus, corrosion of the reinforcing bars can be prevented.

  In addition, when the linear sacrificial anode material is attached along the deep part reinforcing bar, the depth of the concrete removal part is almost equal to the position where the front part of the deep part reinforcing bar is exposed. It is not necessary to remove the surface concrete to a deeper depth, and the removal work of the surface concrete is simplified accordingly, and the amount of construction by-products such as concrete removed is also reduced. For this reason, construction costs can be further eliminated, the construction period can be shortened, and resource saving can be achieved. Moreover, since it is not necessary to suspend and remove the concrete up to the depth of the back of the deep-layer reinforcement, complicated construction work such as removing the surface concrete by avoiding the location of the deep-layer reinforcement is not necessary, so that Costs can be further reduced and work efficiency can be further improved.

The cross-sectional repair structure for a reinforced concrete structure according to claim 4 is the cross-section repair structure for a reinforced concrete structure according to claim 2 or 3 , wherein the fixing member is provided on an outer periphery of the surface layer rebar exposed at the bottom surface of the concrete removal portion. It is an elastic spring member that is externally fitted in a straddling state, and the linear sacrificial anode material is sandwiched between the fixing member and the surface layer rebar, and the outer periphery of the surface layer rebar by the fixing member It is fixed in a state in which it can be energized.

The cross-sectional repair structure of the reinforced concrete structure according to claim 4 operates in the same manner as the cross-section repair structure of the reinforced concrete structure according to claim 2 or 3 , and the linear sacrificial anode material is externally fitted on the outer periphery of the surface layer rebar. Since it is fixed to the rebar itself by the elastic spring member, the linear sacrificial anode material and the surface layer rebar can be reliably contacted, and the energized state is between the linear sacrificial anode material, the surface layer rebar and the deep layer rebar. Can be easily secured.

  In addition, the elastic spring member has an outer periphery of the surface layer reinforcing bar so as to hold the portion of the linear sacrificial anode material over the surface layer reinforcing bar with the surface layer reinforcing bar through the elastic restoring force of the elastic spring member. And the linear sacrificial anode material is fixed to the reinforcing bar, so there is no need to bother to insert or screw concrete nails, staples, or concrete tapping screws into the concrete surface. The linear sacrificial anode material can be fixed easily.

The cross-section repair structure for a reinforced concrete structure according to claim 5 is the cross-section repair structure for a reinforced concrete structure according to claim 1 or 4 , wherein the elastic spring member is externally fitted in a straddled state. When viewed in the axial direction, the shape is substantially C-shaped with an opening at a part of the outer periphery.

According to the cross-sectional repair structure of a reinforced concrete structure according to claim 5 , the elastic spring works in the same manner as the cross-section repair structure of the reinforced concrete structure according to claim 1 or 4 , and from the opening on the outer periphery of the elastic spring member. By pushing the reinforcing bar into the inner peripheral part of the member, expanding the opening and expanding the inner diameter of the elastic spring member, the elastic spring member can be easily fitted on the outer periphery of the reinforcing bar.

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

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

The cross-sectional repair structure for a reinforced concrete structure according to claim 7 is the cross-section repair structure for a reinforced concrete structure according to any one of claims 1 to 6 , wherein the cross-section repair member has a property of permeating and diffusing into the interior of the reinforced concrete structure. A rusting agent is mixed with the repair material.

According to Patching structure of reinforced concrete structures of the claims 7, on which acts similarly to the cross-sectional repair structure of any one of reinforced concrete structures of the claims 1 6, are mixed Patching member (repair material) The rust preventive agent is gradually permeated and diffused over time from the cross-section repair member to the inside of the reinforced concrete structure due to the concentration difference of the rust preventive agent between the cross-section repair member and the reinforced concrete structure.

  When the corrosion of the linear sacrificial anode material (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 reinforced concrete structure, A rust preventive atmosphere is formed not only by the restoration member but also by the rust preventive agent inside the reinforced concrete structure. Therefore, thereafter, corrosion of the reinforcing bars is prevented by the action of the rust preventive agent, regardless of the rust preventive action of the linear sacrificial anode material. 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 of a reinforced concrete structure according to claim 8 is the cross-section repair structure of a reinforced concrete structure according to claim 7 , wherein the rust inhibitor has an ionic component that forms a passive film on the surface of the rebar. Furthermore, it exhibits alkalinity when mixed with the repair material.

According to the cross-sectional repair structure of the reinforced concrete structure according to the eighth aspect , the same effect as that of the cross-section repair structure of the reinforced concrete structure according to the seventh aspect is obtained , and the surface of the rebar is not affected by the action of the ionic component contained in the rust preventive agent. A dynamic film can be formed to prevent corrosion of the reinforcing bars. 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 linear sacrificial anode material, The elution of metal ions is promoted, and the decrease in the anticorrosion current due to the macrocell battery circuit is suppressed.

The cross-sectional repair structure for a reinforced concrete structure according to claim 9 is the cross-section repair structure for a reinforced concrete structure according to any one of claims 1 to 8 , wherein a front portion of the rebar is a shaft of the rebar from the bottom surface of the concrete removal portion. The linear sacrificial anode material is attached along the axial direction of the reinforcing bar exposed on the bottom surface of the concrete removing portion so as to be in contact with the exposed portion of the reinforcing bar. Is.

  According to the cross-sectional repair structure of the reinforced concrete structure of the present invention, the metal wire led out from the main body of the sacrificial anode member dedicated to salt damage countermeasures is bound to the reinforcing bar as in the conventional anticorrosion method and is attached to the back surface of the binding portion. Since it is not necessary to fill and fix mortar, etc., it is not necessary to lift and remove the concrete to the depth of the back of the reinforcing bar, so that the construction cost can be reduced, the construction period can be shortened, and other parts are also removed. Construction by-products such as dry concrete can also be reduced, and construction work can be simplified.

  Moreover, even when the repaired part (damaged part) covers a wide range, the linear sacrificial anode material can be installed freely according to the shape of the repaired part, and the workability is very good. There is. In addition, the linear sacrificial anode material can be a general-purpose metal wire that originally has a function as a sacrificial anode material, which significantly reduces the construction cost compared to the case where a sacrificial anode member dedicated to salt damage countermeasures is used. There is an effect that it can be reduced.

In particular, in the cross-sectional repair structure of the reinforced concrete structure according to claim 7 or 8 , the dissimilar metal generated between the sacrificial anode member and the reinforcing bar during the transition period in which the rust prevention atmosphere by the rust preventive agent is formed. Corrosion protection of the reinforcing bars is made by the macro cell battery circuit formed by the macro cell corrosion, and at the end of the corrosion of the sacrificial anode member by the macro cell battery circuit, a rust prevention atmosphere by the rust preventive agent is formed inside the reinforced concrete structure. Therefore, 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 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. 1 is a cross-sectional view showing a cross-sectional repair structure 1 according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the cross-section repair structure 1, and FIG. 3 is an internal structure of the cross-section repair structure 1 FIG. 2 is a front view showing the cross-sectional repair member 5.

  A cross-sectional repair structure 1 shown in FIGS. 1 to 3 is a structure suitable for repairing a defective portion of an existing reinforced concrete structure 60, and mainly includes a concrete removing portion 2 and a linear sacrificial anode material. 3, an elastic spring fixture 4, and a cross-sectional repair member 5. Here, the reinforced concrete structure 60 is a concrete structure 60 in which a reinforcing bar 62 which is an iron reinforcing material is embedded therein, and the surface layer concrete 61 having a predetermined thickness extends from the reinforcing bar 62 to the concrete outer surface 60a. It is covered.

  Further, the reinforced concrete structure 60 has a reinforcing bar 62a arranged on the surface layer side so as to extend in the vertical direction of FIG. 2 (hereinafter referred to as “surface layer reinforcing bar”) 62a and a deep layer side deeper than the surface layer reinforcement 62a. 1, a reinforcing bar (hereinafter referred to as “deep layer reinforcing bar”) 62b that is arranged to extend in the left-right direction. Further, the surface layer reinforcing bars 62a and the deep layer reinforcing bars 62b are assembled in a state where they are in contact with each other as shown in FIG. 1 and FIG. 2 and intersect in a substantially lattice shape as shown in FIG. Yes.

  As shown in FIG. 1 and FIG. 2, the concrete removing portion 2 removes the concrete outer surface 60a of the reinforced concrete structure 60 by partially removing the surface concrete 61 in the defective portion of the reinforced concrete structure 60 by removing it. It is the part made to do. The defective portion of the reinforced concrete structure 60 refers to, for example, a location where the chloride ion concentration is high and corrosion of the rebar 62 inside the concrete is recognized, or a location where corrosion of the rebar 62 is predicted.

  The depth of the concrete removing portion 2 is exposed up to the back portion of the surface layer reinforcing bar 62a, and at least a part of the front portion of the deep layer reinforcing bar 62b (the lower portion of the deep layer reinforcing bar 62b in FIG. 1) is exposed. The size is such that it is exposed. That is, in the stage before construction of the cross-section repair member 5, the surface layer rebar 62a is completely exposed from the bottom surface 2a of the concrete removing portion 2, and the front portion of the deep layer rebar 62b is in the axial direction of the deep layer rebar 62b. It will be in the state exposed along.

  The reason why the depth of the concrete removing portion 2 is set in this way is that cracks of the concrete due to reinforcing steel corrosion often occur around the surface layer reinforcing steel 62a, so that such defective concrete is reliably removed. . In addition, about each reinforcing bar 62a, 62b, the front means the outer peripheral surface of the concrete outer surface 60a side (the lower side of FIG. 1, the left side of FIG. 2, the front side with respect to the paper surface of FIG. 3) of each reinforcing bar 62a, 62b, Means the outer peripheral surface of each reinforcing bar 62a, 62b on the anti-concrete outer surface 60a side (the upper side in FIG. 1, the right side in FIG. 2, the back side with respect to the paper surface in FIG. 3).

  The linear sacrificial anode material 3 is a kind of sacrificial anode member that exhibits an anticorrosion function, and is a metal wire material (wire) having a greater ionization tendency than the reinforcing bar 62 (iron). Moreover, as a specific example of the metal wire used for the linear sacrificial anode material 3, zinc or a zinc alloy wire that has low corrosion expansion and can be obtained at low cost is more preferable. Furthermore, the linear sacrificial anode material 3 does not necessarily need to be a dedicated product for countermeasures against salt damage, and a general-purpose metal wire (off-the-shelf) is used as long as it is made of metal capable of exhibiting the above-described sacrificial anode member function. You can also.

  As shown in FIGS. 1 and 3, the linear sacrificial anode material 3 is formed in the axial direction of the deep layer rebar 62 b where the front portion is exposed from the bottom surface 2 a of the concrete removing portion 2 (left and right direction in FIGS. 1 and 3). Along with this, the front portion of the deep layer reinforcing bar 62b (the lower portion of the deep layer reinforcing bar 62b in FIG. 1), that is, the surface of the exposed portion of the deep layer reinforcing bar 62b is attached to the deep layer reinforcing bar 62b. Established. In this way, the linear sacrificial anode material 3 is attached along the exposed front portion of the deep layer reinforcing bar 62b, and is brought into contact with the deep layer reinforcing bar 62b in a conductive manner.

  In addition, since the deep layer reinforcing bar 62b is also in contact with the surface layer reinforcing bar 62a, a macro cell battery circuit is formed in which a corrosion protection current flows from the linear sacrificial anode material 3 to both the deep layer reinforcing bar 62b and the surface layer reinforcing bar 62a. It becomes. Then, since the linear sacrificial anode material 3 is corroded in place of the surface layer reinforcing bar 62a and the deep layer reinforcing bar 62b, the corrosion of each of the reinforcing bars 62a and 62b can be prevented.

  The linear sacrificial anode material 3 includes a material that is easily plastically deformed manually. For this reason, when it is attached along the axial direction of the deep layer reinforcing bar 62b, it is plastically deformed so as to get over the surface layer reinforcing bar 62a intersecting the deep layer reinforcing bar 62b, and the deep layer part avoiding the surface layer reinforcing bar 62a. It can arrange | position continuously along the axial direction (left-right direction of FIG.1 and FIG.3) of the reinforcing bar 62b. For this reason, the linear sacrificial anode material 3 is curved and deformed in a substantially U shape at the intersection of the deep layer rebar 62b and the surface layer rebar 62a, so that the surface layer portion along the outer periphery of the surface layer rebar 62a. The curved form part 3a used as the form which gets over the reinforcing bar 62a is provided.

  The elastic spring fixture 4 directly attaches the linear sacrificial anode material 3 to the reinforcing bar 62 exposed from the bottom surface 2a of the concrete removing portion 2, and is a metal having elastic resilience such as a spring steel material. A curved line. According to the present embodiment, the elastic spring fixture 4 is formed so as to be able to be fitted over the outer periphery of the surface layer rebar 62a as shown in FIGS. As a result, the curved form portion 3a of the linear sacrificial anode material 3 is sandwiched between the elastic spring fixture 4 and the surface layer rebar 62a, and fixed in a state of being in direct contact with the outer peripheral surface of the surface layer rebar 62a so as to be energized. Has been.

  In this way, if the linear sacrificial anode material 3 is brought into contact with the surface layer reinforcing bar 62a so as to be energized, the surface layer reinforcing bar 62a is also in contact with the deep layer reinforcing bar 62b. It is possible to energize both the partial reinforcing bar 62a and the deep layer reinforcing bar 62b. In this case, even if the linear sacrificial anode material 3 cannot be brought into contact with the deep layer rebar 62b enough to allow energization, the linear sacrificial anode material 3 can be attached to the surface layer rebar 62a and the deep layer. A macrocell battery circuit in which an anticorrosion current flows from the linear sacrificial anode material 3 to both the surface layer reinforcing bar 62a and the deep layer reinforcing bar 62b can be formed as a state in which both of the partial reinforcing bars 62b can be energized.

  With reference to FIG. 4, the elastic spring fixture 4 which fixes the linear sacrificial anode material 3 is demonstrated. 4 (a) is a partially enlarged view of FIG. 1, FIG. 4 (b) is a partially enlarged view of FIG. 2, and FIG. 4 (c) is a partially enlarged view of FIG. .

  As shown in FIG. 4A, the elastic spring fixture 4 has an annular shape having a substantially C shape in which an opening 4a is provided in a part of the outer periphery when the surface layer reinforcing bar 62a is viewed in the axial direction. A portion 4b is provided, and the annular portion 4b is externally fitted around the surface layer reinforcing bar 62a. The opening 4a is an entrance for fitting the surface layer rebar 62a into the annular portion 4b. According to this elastic spring fixture 4, by pushing the surface layer rebar 62a into the opening 4a, the annular portion 4b is elastically deformed, the opening 4a is expanded, and the inner diameter of the annular portion 4b is expanded. The annular portion 4b is configured to be fitted over the outer periphery of the surface layer rebar 62a in a straddled state.

  As shown in FIGS. 4 (b) and 4 (c), the elastic spring fixture 4 has a pair of extensions extending from both ends of the opening 4a in the annular portion 4b substantially in parallel with the surface layer rebar 62a. Parts 4c and 4c. Engagement recesses 4d and 4d with which the linear sacrificial anode material 3 is engaged are formed in the pair of extending portions 4c and 4c, and the engagement recesses 4d and 4d are engaged with each other. The linear sacrificial anode material 3 is pressed against the outer peripheral surface of the surface layer rebar 62 a by the elastic restoring force of the elastic spring fixture 4.

  As shown in FIGS. 1 and 2, the cross-sectional repair member 5 is formed of a repair material that is filled and hardened in the concrete removing portion 2, and is attached to the reinforcing bar 62 in the concrete removing portion 2. While the sacrificial anode material 3 is encapsulated, the portion that was the concrete removal portion 2 is backfilled and restored. Here, the repair material used for the cross-section repairing member 5 is mainly composed of cement-based mortar, for example, and a rust preventive agent having a property of penetrating and diffusing into the interior of the reinforced concrete structure 60 as an additive. Yes.

  The rust preventive agent mixed in the cross-section repairing member 5 has an ionic component that forms a passive film on the surface of the reinforcing bar 62, and further exhibits alkalinity when mixed in the repair material. For this reason, a passive film can be formed on the surface of the reinforcing bar 62 by the action of the ionic component contained in the rust preventive agent, and corrosion of the reinforcing bar 62 can be prevented. Moreover, since the cross-sectional repair member 5 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 linear sacrificial anode material 3 is prevented, and the linear sacrificial anode material The elution of metal ions from 3 is promoted, and the decrease in 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 a 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 62. 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 5. 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 (filling method) in which the removal part 2 is filled and cured, or a method (left plastering method) in which an uncured repair material is filled and finished in the concrete removal part 2 by plastering can be used.

  Thus, according to the cross-sectional repair structure 1 of the present embodiment, the rust inhibitor mixed in the cross-section repair member 5 is the difference in concentration of the rust preventive agent between the cross-section repair member 5 and the reinforced concrete structure 60. As a result, the osmotic material is gradually permeated and diffused over time from the cross-section repair member 5 into the reinforced concrete structure 60. For this reason, when the corrosion of the linear sacrificial anode material 3 proceeds and the anticorrosion effect declines, the rust preventive agent is sufficiently diffused and penetrated into the reinforced concrete structure 60, so that not only the cross-section repair member 5 but also the reinforced concrete. Since the inside of the structure 60 is also formed with a rust-proof atmosphere by the rust preventive agent, the corrosion of the reinforcing bars 62 is prevented by the action of the rust preventive agent even after this, regardless of the rust preventive action of the linear sacrificial anode material 3. The

  Next, a modification of the above embodiment will be described with reference to FIGS. 5A shows the cross-sectional repair structure 20 of the second embodiment, FIG. 5B shows the cross-section repair structure 30 of the third embodiment, and FIG. 6A shows the cross-section repair of the fourth embodiment. FIG. 6B is a partially enlarged longitudinal sectional view of the structure 40 and the sectional repair structure 50 of the fifth embodiment.

  The cross-sectional repair structures 20, 30, 40, 50 from the second embodiment to the fifth embodiment are linear with respect to the elastic spring fixture 4 used in the cross-section repair structure 1 of the first embodiment described above. The form of the fixing member for fixing the sacrificial anode material 3 is changed. 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. 5A, according to the cross-sectional repair structure 20 of the second embodiment, the linear sacrificial anode material 3 is made of the surface layer rebar 62a using the quick-drying and conductive adhesive 21. The concrete removing portion is directly bonded to the outer peripheral surface and the surface of the front portion of the deep layer reinforcing bar 62b, and the adhesive 21 serves as a fixing member so that the surface layer reinforcing bar 62a and the deep layer reinforcing bar 62b can be energized. It is fixed in 2.

  As shown in FIG. 5B, according to the cross-sectional repair structure 30 of the third embodiment, the concrete nail 31 is driven into the concrete surface that forms the bottom surface 2a of the concrete removing portion 2, and the head portion of the concrete nail 31 is By being struck and bent, the bent portion becomes a fixing member, and the linear sacrificial anode material 3 is fixed while being pressed against the surface of the front portion of the deep layer rebar 62b.

  As shown in FIG. 6 (a), according to the cross-sectional repair structure 40 of the fourth embodiment, the staple 41 is in a state where the linear sacrificial anode material 3 is in contact with the surface of the front portion of the deep layer reinforcing bar 62b. The staple 41 becomes a fixing member, and the linear sacrificial anode material 3 is formed by being driven into the concrete surface forming the bottom surface 2a in the concrete removing portion 2 so as to straddle the sacrificial sacrificial anode material 3 and the deep layer rebar 62b. It is fixed while being pressed against the surface of the front portion of the deep layer rebar 62b.

  As shown in FIG. 6B, according to the cross-sectional repair structure 50 of the fifth embodiment, the concrete tapping screw 52 is screwed into the concrete surface forming the bottom surface 2a of the concrete removing portion 2, and the concrete tapping screw 52 The wire retainer 51 fixed in (1) serves as a fixing member, and the linear sacrificial anode material 3 is fixed while being pressed against the surface of the front portion of the deep layer reinforcing bar 62b.

  FIG. 7 is a longitudinal sectional view of the cross-sectional repair structure 70 of the sixth embodiment. The cross-sectional repair structure 70 of the sixth embodiment is obtained by changing the structure of the cross-section repair 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. 7, in the cross-sectional repair structure 70 of the sixth embodiment, the concrete is removed from the surface 71a of the cross-section repair member 71 instead of mixing the rust preventive agent to the entire cross-section repair member as in the first embodiment. At least a part of the range of the thickness W0 up to the bottom surface 2a of the part 2 is a predetermined thickness W1 using a repair material mixed with a rust preventive agent (hereinafter referred to as "rust preventive repair material"). A rust prevention portion 71b is formed, and the remaining portion excluding the rust prevention portion 71b is made of a thickness W2 (= W0−) using a repair material in which the rust preventive agent is not mixed (hereinafter referred to as “non-rust prevention repair material”). The non-rust prevention part 71c for W1) is formed.

  Moreover, as a construction example about the rust prevention part 71b and the non-rust prevention part 71c, as shown in FIG. 7, after forming the concrete removal part 2 first, it looks like enveloping the exposed part of the reinforcing bar 62. After the rust preventive repair material is applied to the bottom surface 2a of the concrete removing portion 2 with the predetermined thickness W1 to form the rust preventive portion 71b, the non-rust preventive repair material is applied thereon with the predetermined thickness W2. It is preferable to form the cross-sectional repair member 71 having a predetermined thickness W0 (= W1 + W2) by curing each of these repair materials after forming the rust prevention portion 71c.

  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 the form of the linear sacrificial anode material and the repair material are within the scope of the present invention. It can be easily inferred that various improvements and modifications can be made with respect to the composition, the composition of the rust inhibitor, the construction method of the cross-sectional repair structure, and the like.

  For example, in this embodiment, the various wiring fixtures described in the first to fifth embodiments have been described as an example of a fixing member for fixing the linear sacrificial anode material 3. However, the present invention is not necessarily limited thereto, and other types of fixing jigs or those commonly used as wiring fixtures may be used as fixing members for the linear sacrificial anode material 3.

  Further, in the cross-sectional repair structure 1 of the present embodiment, the surface layer concrete 61 has been described on the premise that the surface layer concrete 61 is removed up to a substantially boundary position between the back surface portion of the surface layer rebar 62a and the front surface portion of the deep layer rebar 62b. The removal depth of 61 (hanging depth), that is, the depth of the concrete removal portion 2 is not necessarily limited to this, but the amount of salt (chloride ion) permeation into the reinforced concrete structure 60 and the deep layer portion. You may change suitably according to the corrosion condition of the reinforcing bar 62b. Further, when the corrosion of the deep layer rebar 62b is proceeding, the removal depth of the surface concrete 61 is expanded to the corroded portion of the deep layer reinforce 62b, and the linear sacrificial anode material 3 is made to the deep layer rebar 62b. It is also possible to attach it so that it can be energized.

  For example, when the amount of osmotic salt is small and the damage is mild, at least the front portion of the surface layer rebar 62a is exposed from the bottom surface 2a of the concrete removal portion 2 without removing the surface layer concrete 61 until the deep layer rebar 62b is exposed. If possible, the adhesive 21 illustrated in the second to fifth embodiments, the concrete nail 31, the staple are attached to the surface of the surface layer reinforcing bar 62a while being attached along the axial direction of the surface layer reinforcing bar 62a. 41 or a wire retainer 51 may be used for contact and fixation so as to allow energization.

  Further, in this embodiment, as shown in FIGS. 1 to 6, the number of the linear sacrificial anode materials 3 attached to one deep layer reinforcing bar 62 b has been described as one. The number of the linear sacrificial anode materials attached to the metal rod is not necessarily limited to one, and for example, two or more linear sacrificial anodes per one reinforcing bar depending on the corrosion prevention period of the sacrificial anode material. You may make it attach a material.

  In addition, what kind of attachment form of two or more linear sacrificial anode materials will be as long as two or more linear sacrificial anode materials are attached to one reinforcing bar in a state where they can be energized? For example, two or more linear sacrificial anode materials may be bundled together and attached to the reinforcing bar, or two or more linear sacrificial anode materials may be parallel to the outer circumferential direction of the reinforcing bar. It may be in the form of being attached side by side.

It is a cross-sectional view which shows the cross-sectional repair structure which is one Example of this invention. It is a longitudinal cross-sectional view of a cross-sectional repair structure. It is a front view which shows the internal structure of a cross-section repair structure, Comprising: Illustration of a cross-section repair member is abbreviate | omitted. (A) is the elements on larger scale of FIG. 1, (b) is the elements on larger scale of FIG. 2, (c) is the elements on larger scale of FIG. (A) is a partial enlarged longitudinal sectional view relating to the sectional repair structure of the second embodiment, and (b) is a partially enlarged longitudinal sectional view relating to the sectional repair structure of the third embodiment. (A) is a partial enlarged longitudinal cross-sectional view regarding the cross-sectional repair structure of 4th Example, (b) is a partial enlarged vertical cross-sectional view regarding the cross-sectional repair structure of 5th Example. It is a longitudinal cross-sectional view of the cross-sectional repair structure of 6th Example.

1,70 Cross-section repair structure (cross-section repair structure of reinforced concrete structure)
20, 30, 40, 50 Cross-section repair structure (cross-section repair structure of reinforced concrete structure)
2 Concrete removal part 2a Bottom surface 3a of concrete removal part Curved form part (the part which got over the surface layer rebar)
3 linear sacrificial anode material 4 elastic spring fixture (elastic spring member, fixing member)
4a Opening 5 Cross-section repair member 21 Adhesive (fixing member)
31 Concrete nails (fixing members)
41 Staple (fixing member)
51 Wire retainer (fixing member)
60 Reinforced concrete structure 61 Surface concrete 62 Reinforcement 62a Surface layer reinforcement (surface layer reinforcement, reinforcement)
62b Deep Rebar (Deep Rebar, Rebar)

Claims (9)

A concrete removal part formed by removing the surface concrete in the defective part of the reinforced concrete structure;
A linear sacrificial anode material having a wire-like form attached along the reinforcing bar where the front portion is exposed from the bottom surface of the concrete removing portion,
A fixing member for fixing the linear sacrificial anode material in the concrete removing portion in a state where the linear sacrificial anode material is in contact with the exposed front portion of the reinforcing bar so as to be energized
A cross-sectional repair member formed of a repair material filled and cured in the concrete removal portion so as to encapsulate the linear sacrificial anode material fixed by the fixing member,
The fixing member is an elastic spring member that is externally fitted in a straddling state on the outer periphery of the reinforcing bar exposed on the bottom surface of the concrete removing portion,
The linear sacrificial anode material is sandwiched between the fixing member and the reinforcing bar, and is fixed in a state where the fixing member is in contact with the outer periphery of the reinforcing bar so as to be energized. Cross-section repair structure for reinforced concrete structures. The reinforced concrete structure includes a surface layer reinforcing bar arranged on the surface layer side of the reinforced concrete structure, and a deep layer reinforcing bar arranged deeper than the surface layer reinforcing bar and contacting and intersecting the surface layer reinforcing bar,
The concrete removing portion is located at a position where the depth is substantially equal to the position where the front portion of the deep portion reinforcing bar is exposed, and the front portion of the deep portion reinforcing bar is exposed from the bottom surface of the concrete removing portion,
The linear sacrificial anode material is attached along the deep layer reinforcing bar, and is configured to climb over the surface layer reinforcing bar along the outer periphery of the surface layer reinforcing bar at the intersection of the deep layer reinforcing bar and the surface layer reinforcing bar. And
2. The reinforced concrete structure according to claim 1 , wherein the fixing member is configured to attach a portion of the linear sacrificial anode material, which is shaped to overcome the surface layer reinforcing bar, to the surface layer reinforcing bar. 3 . Cross-section repair structure. A concrete removal part formed by removing the surface concrete in the defective part of the reinforced concrete structure;
A linear sacrificial anode material having a wire-like form attached along the reinforcing bar where the front portion is exposed from the bottom surface of the concrete removing portion,
A fixing member for fixing the linear sacrificial anode material in the concrete removing portion in a state where the linear sacrificial anode material is in contact with the exposed front portion of the reinforcing bar so as to be energized
A cross-sectional repair member formed of a repair material filled and cured in the concrete removal portion so as to encapsulate the linear sacrificial anode material fixed by the fixing member,
The reinforced concrete structure includes a surface layer reinforcing bar arranged on the surface layer side of the reinforced concrete structure, and a deep layer reinforcing bar arranged deeper than the surface layer reinforcing bar and contacting and intersecting the surface layer reinforcing bar,
The concrete removing portion is located at a position where the depth is substantially equal to the position where the front portion of the deep portion reinforcing bar is exposed, and the front portion of the deep portion reinforcing bar is exposed from the bottom surface of the concrete removing portion,
The linear sacrificial anode material is attached along the deep layer reinforcing bar, and is configured to climb over the surface layer reinforcing bar along the outer periphery of the surface layer reinforcing bar at the intersection of the deep layer reinforcing bar and the surface layer reinforcing bar. And
The cross-sectional repair structure of a reinforced concrete structure, wherein the fixing member is a member that attaches a portion of the linear sacrificial anode material that is shaped to get over the surface layer reinforcing bar to the surface layer reinforcing bar . The fixing member is an elastic spring member that is externally fitted in a straddling state on the outer periphery of the surface layer rebar exposed at the bottom surface of the concrete removing portion,
The linear sacrificial anode material is clamped between the fixing member and the surface layer rebar, and is fixed in a state in which the outer periphery of the surface layer rebar is energized by the fixing member. The cross-sectional repair structure of a reinforced concrete structure according to claim 2 or 3 . The elastic spring member has a substantially C-shaped configuration having an opening in a part of the outer periphery when the reinforcing bar that is externally fitted in a straddled state is viewed in the axial direction. The cross-sectional repair structure of a reinforced concrete structure according to claim 1 or 4, characterized in that: The cross section of a reinforced concrete structure according to any one of claims 1 to 5, wherein the linear sacrificial anode material is a single metal having a higher ionization tendency than a reinforcing bar, and is formed of zinc or a zinc alloy. Repair structure. The reinforced concrete according to any one of claims 1 to 6, wherein the cross-section repairing member is a material in which a rust preventive agent having a property of penetrating and diffusing into a reinforced concrete structure is mixed with the repair material. Cross-sectional repair structure of structures. The rust inhibitor according to claim 7 has an ionic component forming a passivation film on the surface of the reinforcing bar, further characterized in that shows the alkalinity in a state of being mixed with the repair material Section repair structure of the reinforced concrete structure described . From the bottom surface of the concrete removal portion, the front portion of the reinforcing bar is exposed along the axial direction of the reinforcing bar,
The linear sacrificial anode material, according to the axial direction of said reinforcing bars being exposed on the bottom surface of the concrete removal unit, characterized in that it is intended to be additionally provided so as to contact the exposed portion of the reinforcing bars Item 9. A cross-sectional repair structure of a reinforced concrete structure according to any one of Items 1 to 8 .

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