JP3280945B2 - Method for repairing deteriorated concrete and electrode panel used in the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes the electro-osmotic action, electrolysis and electrophoresis actions of the electrokinetic phenomenon during the electrokinetic phenomenon to remove harmful substances of concrete deteriorated due to salt damage and neutralization of existing concrete structures. The present invention relates to a method of repairing a concrete structure by decomposing and removing the same, and an electrode panel used in the method.

[0002]

2. Description of the Related Art Conventionally, as a method for repairing salt-damaged concrete in which salt has penetrated into existing concrete, the salt-damaged concrete is mechanically destroyed and removed, repaired with mortar containing no salt, and the concrete surface is shielded from salt. The salt damaged concrete was rehabilitated by coating with a highly reactive resin.

[0003]

However, in the above-mentioned conventional restoration method, it is difficult to measure the amount of salt infiltrated into the concrete, and when the salt penetration is deep and reaches near the reinforcing bar, the concrete is rejected. There is a problem that it is impossible to remove all of them, and further, the strength of the concrete structure is reduced.

The present invention has been made in order to solve the above-mentioned problems, and does not remove salt-hazardous concrete mechanically, but uses harmful substances of concrete deteriorated due to salt damage, neutralization, etc. of existing concrete structures. To provide a nondestructive method for repairing degraded concrete by decomposing and removing the same using electroosmosis, electrolysis and electrophoresis during electrokinetic phenomena, and an electrode panel used in the method Things.

[0005]

SUMMARY OF THE INVENTION According to the present invention, one or a plurality of short iron wires having a sharp end at a predetermined interval are bonded to one or a plurality of iron wires, and the wires are bound and fixed. Each of the sharp portions is projected radially, and the whole is plated with zinc to form an electrode wire having the sharp portion as a discharge terminal, and a plurality of the electrode wires are combined in a mesh form at a predetermined interval. To form an electrode main body, and water retaining mats are provided on both inner and outer side surfaces of the electrode main body, and a net is attached to an outer surface of the water retaining mat located on the outer side surface, and the electrode main body and each water retaining mat are attached. The electrode panel is formed by being integrally attached and fixed to the frame, and water for electrolysis is retained in each of the water retaining mats of the electrode panel, and the water retaining mat located inside is brought into close contact with the surface of the deteriorated existing concrete, and the mounting is performed. Fix the frame to the existing concrete Connecting the electrode body to the anode side of the DC power supply, checking the position of the reinforcing steel inside the deteriorated existing concrete, making a hole, and connecting the reinforcing steel to the cathode side of the DC power supply. Thereafter, by applying a DC voltage from the DC power source to the electrode body and the reinforcing bar, an electric field having a high current density is generated by discharging from the sharp portions,
Electrolysis water in each water retention mat reaches the rebar of the cathode while wetting the cement part in the existing concrete by the electroosmotic action during the electrokinetic phenomenon, and at the same time, electrolysis occurs and exists in the pores in the concrete. Salt is converted to chloride ions and discharged out of the concrete system by electrophoresis. Sodium is converted to hydroxyl groups (OH ⁻ ) in the vicinity of the rebar as a cathode together with electroosmotic water, and neutralized with alkaline water having a high pH of about 12. A method of protecting the reinforcing steel in a plated state by regenerating the concrete that has been applied and converting the zinc plated on the electrode body into zinc ions by electrolysis and adhering to the reinforcing steel by electrophoresis, or using one or more iron wires. One short iron wire with a predetermined interval and a sharp end at the tip,
Alternatively, a plurality of wires are bound and fixed, each of the sharp portions is radially protruded, and the entire portion is galvanized to form an electrode wire having the sharp portion as a discharge terminal, and a plurality of the electrode wires are formed. An electrode main body is formed in a mesh shape with a predetermined interval, and a water retention mat is provided on both inner and outer side surfaces of the electrode main body, and a net is additionally provided on an outer surface of the water retention mat located on the outer surface. An electrode panel is formed by integrally mounting and fixing the electrode body and each of the water retention mats to a mounting frame, and water for electrolysis is retained in each of the water retention mats of the electrode panel, and the existing water retention mat located inside is deteriorated. The electrode body is connected to the anode side of the DC power supply while the mounting frame is fixed to the existing concrete by being in close contact with the surface of the concrete, and when there is no reinforcing steel inside the deteriorated existing concrete, the existing concrete is A narrow groove is engraved from the surface of the REIT, an iron wire is buried in the groove and filled with mortar, and the iron wire is connected to the cathode side of the DC power supply. By applying to the iron wire, it discharges from each of the sharp parts to create an electric field with a high current density, and the water for electrolysis in each of the water retention mats causes the cement portion in the existing concrete to undergo electroosmosis during the electrokinetic phenomenon. It reaches the iron wire of the cathode while wetting, and at the same time electrolysis occurs, the salt existing in the pores in the concrete becomes chlorine ions, and is discharged out of the concrete system by electrophoresis, and sodium is removed together with the electroosmotic water. A hydroxyl group (OH ⁻ ) is formed in the vicinity of the iron wire, and concrete neutralized with alkaline water having a high pH of about 12 is regenerated. The above problem has been solved by adopting a method in which zinc ions are generated by electrolysis and adhere to the iron wire by electrophoresis to protect the iron wire in a plated state.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. One or a plurality of short iron wires 3 are bound and fixed, and each of the sharp portions 2 is radially protruded in one direction, and the whole is plated with zinc, and the sharp portions 2 are connected to discharge terminals. Is formed. In FIG. 1, each sharp portion 2 is radially projected in one direction, but may be radially projected in multiple directions. Preferably, it is recommended to project radially in one direction.

[0007] The electrode body 4 is formed by combining a plurality of the electrode wires 4 at predetermined intervals in a mesh form, and the inner and outer sides of the electrode body 5 are formed of, for example, a nonwoven fabric with high water retention. Water retaining mats 6 and 7 are provided, and a net 8 made of, for example, nylon is attached to the outer surface of the water retaining mat 7 located on the outer surface to prevent detachment of the water retaining mat 7, The electrode panel 10 is formed by integrally mounting and fixing the water retaining mats 5 and the water retaining mats 6 and 7 to the mounting frame 9.

The water retaining mats 6 and 7 of the electrode panel 10 are respectively impregnated with electrolyzing water. As the electrolyzing water, for example, fresh water, alkali-reduced water or magnetized water is used. Small ones are preferred. In particular, magnetized water has small clusters of water,
Therefore, since the unit specific surface area is large, it has the ability to increase the number of chlorine ions in contact with it, and is excellent as electrolysis water used in the method of the present invention.

The water for electrolysis is retained in the water retention mats 6 and 7, and the water retention mat 6 located inside is brought into close contact with the surface of the existing concrete 11 which has been deteriorated due to salt damage, neutralization, etc., and the mounting frame 9 is attached. The electrode body 5 is fixed to the existing concrete 11 by an anchor bolt or the like.
Is connected to the anode side of a DC power supply (not shown).

On the other hand, the deteriorated existing concrete 11
After confirming the position of the reinforcing bar 12 inside the above, a hole is made with a drill or the like, and the reinforcing bar 12 is connected to the cathode side of the DC power supply.

The DC voltage from the DC power source is applied to the electrode body 5.
In FIG. 3, each sharp portion 2 of the electrode wire 4 of the electrode panel 10 is provided so as to protrude radially inward (one side) from the iron wire 1 in the direction of the existing concrete 11 in FIG. Since an electric field having a high current density is generated by discharging from the portion 2 toward the reinforcing bar 12, the electrolyzing water in the water retention mats 6 and 7 on the anode side is subjected to the electroosmotic action during the electrokinetic phenomenon, and the existing concrete 11 is discharged. The wet cement portion reaches the reinforcing bar 12 of the cathode.

The sharper the tip of the electrode is, the easier it is for the lines of electric force to gather and the electric field near the electrode becomes very strong, so that it protrudes radially in the direction of the existing concrete 11 inside (one side) the iron wire 1. Strongly discharged from each sharp portion 2 provided to the reinforcing bar 12 of the cathode, and the electrolyzing water during the electrokinetic phenomenon does not hinder the gravel or coarse aggregate in the existing concrete 11 for electrolysis water. Penetrates into the existing concrete 11 and simultaneously undergoes electrolysis, salt existing in the pores in the concrete becomes chlorine ions and is discharged out of the concrete system by electrophoresis, and sodium hydroxyl in the vicinity of the reinforcing bars 12 is the cathode with (OH ^-), and the neutralized concrete with a high alkaline water about pH12 with is regenerated, the electrode present 5-plated zinc becomes zinc ion by electrolysis, deposited on the surface of the reinforcing bar 12 by electrophoresis action,
The reinforcing bar 12 is protected in a plated state with zinc ions. Even if each of the sharp portions 2 protrudes radially from the iron wire 1 in multiple directions, unlike FIG. 2, the rebar 12 of the cathode is only on the inner side. Reinforcing bar 1
Since an electric field having a high current density can be produced by strongly discharging in two directions, it can be sufficiently used in the method of the present invention.

The method of retaining the water for electrolysis in the water retention mats 6 and 7 is optional. However, since the electric field water flows below the water retention mats 6 and 7 over time, a water sprinkler is used at regular intervals. It is recommended to refill with water injection and water retention.

The electrode wires 4 forming the electrode body 5
As shown in FIG. 4, a plurality of short iron wires 3 having sharp ends 2 at predetermined ends are bound to a plurality of iron wires 1 so that each sharp portion 2 protrudes radially in multiple directions. Let me
The barbed wire 13 sold by galvanizing may be used as it is. When the electrode main body 5 is formed by using the barbed wire 13, each sharp part 2 protrudes radially in multiple directions, but since the reinforcing bar 12 of the cathode is only on the inner side, the outer side is formed. Each of the sharp portions 2 protruding toward the cathode can strongly discharge in the direction of the reinforcing bar 12 of the cathode to produce an electric field having a high current density, and thus can be sufficiently used in the method of the present invention.

As shown in FIG. 5, the wire mesh 1 is sold by combining the electrode wires 5 in a mesh shape.
5 and bundling one or more short iron wires having a sharp end 2 at one end in a direction of one side of the wire net 15 and projecting them radially. A plated one may be used. In addition, unlike the case of FIG. 5, even if the sharp portion 2 radially protrudes from the iron wire 14 in multiple directions, since the rebar 12 of the cathode is only on the inner side, even the sharp portion 2 protruding outward may be used. , Cathode reinforcement 12
Since the electric field having a high current density can be produced by strongly discharging in the direction, it can be sufficiently used in the method of the present invention.

The deteriorated existing concrete 1
In the case where there is no reinforcing bar in 1, as shown in FIG. 6, a narrow groove 16 having a blade width of a concrete cutter is cut in the surface of the existing concrete, and an iron wire 17 is embedded in the groove 16.
By filling with a mortar 18 and using the iron wire 17 as a cathode, the same effect as in the case where the rebar 12 is provided can be obtained. In addition, even if the restoration of the deteriorated concrete is completed, the iron wire 17 is buried without being removed. Also in this case, similarly to the above, the zinc plated on the electrode body 5 becomes zinc ions by electrolysis and adheres to the surface of the iron wire 17 by electrophoresis, and the iron wire 17 is protected in a plated state with zinc ions.

The zinc-plated zinc applied to the electrode body 5 of the electrode panel 10 used in the method for repairing degraded concrete of the present invention gradually disappears with the progress of the repair work. Need to be applied.

[0018]

The present invention is as described above. Therefore, instead of mechanically removing the salt-damaged concrete impregnated with salt as in the prior art, the electroosmotic action, electrolysis and electrophoresis during the electrokinetic phenomenon are performed. By using the action to decompose and remove non-destructive degraded concrete harmful substances, it is not necessary to remove mechanically as in the past, and it is possible to repair degraded concrete with extremely simple equipment At the same time, the internal rebar can be protected.

[Brief description of the drawings]

FIG. 1 is a side view of an electrode wire used in the method of the present invention.

FIG. 2 is a partially cutaway front view of an electrode panel used in the method of the present invention.

FIG. 3 is a longitudinal sectional view showing a state where an electrode panel used in the method of the present invention is attached to existing concrete.

FIG. 4 is a side view showing another embodiment of the electrode wire used in the method of the present invention.

FIG. 5 is a front view showing another embodiment of the electrode body used in the method of the present invention.

FIG. 6 is a longitudinal sectional view showing a state in which an electrode panel is mounted when existing concrete is unstretched in the method of the present invention.

[Explanation of symbols]

1 iron wire, 2 sharp part, 3 short iron wire, 4 electrode wire, 5 electrode body, 6.7 water retention mat, 8 net, 9 mounting frame, 10 electrode panel, 11 existing concrete, 12 rebar, 13 barbed wire, 1
4 iron wire, 15 wire mesh, 16 groove, 17 iron wire,
18 Mortar.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Eisuke Shuto 6-2-1, Sagimiya, Nakano-ku, Tokyo (56) References JP-A-7-315957 (JP, A) JP-A-7-232976 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 23/02 E04G 23/08 C04B 41/60 C25B 11/03

Claims (7)

(57) [Claims] 1. A single iron wire or a plurality of short iron wires each having a predetermined interval and having a sharp tip at a predetermined interval are bound and fixed to one or more iron wires, and the sharp portions are radially formed. The entire body is protruded and galvanized to form an electrode wire having the sharp portion as a discharge terminal, and a plurality of the electrode wires are combined in a mesh at a predetermined interval to form an electrode body, and Water retention mats are disposed on both the inner and outer sides of the electrode body, and a net is additionally provided on the outer surface of the water retention mat located on the outer side,
An electrode panel is formed by integrally mounting and fixing the electrode body and each of the water retaining mats to a mounting frame, and water for electrolysis is retained in each of the water retaining mats of the electrode panel. The mounting frame is fixed to the existing concrete, and the electrode body is connected to the anode side of the DC power source, while confirming the position of the reinforcing steel inside the deteriorated existing concrete and drilling holes. Then, the rebar is connected to the cathode side of the DC power source, and then a DC voltage from the DC power source is applied to the electrode body and the rebar, thereby discharging from the sharp portions to form an electric field having a high current density. The water for electrolysis in each of the water retention mats reaches the cathode rebar while moistening the cement part in the existing concrete by the electroosmotic action during the electrokinetic phenomenon, and at the same time, electrolyzes Occurs, salt present in the pores in the concrete is a chloride ion, to the outside of the concrete is discharged electrophoretically action, sodium hydroxyl in the vicinity of the reinforcing bars is a cathode with electro-osmotic water (OH ^-), and the As well as regenerating concrete neutralized with high alkaline water having a pH of about 12, zinc plated on the electrode body becomes zinc ions by electrolysis, adheres to the reinforcing bar by electrophoresis, and protects the reinforcing bar in a plated state. A method for repairing degraded concrete, characterized in that: 2. A single iron wire or a plurality of short iron wires having a sharp tip at a predetermined interval are bound and fixed to one or more iron wires, and the sharp portions are radially formed. The entire body is protruded and galvanized to form an electrode wire having the sharp portion as a discharge terminal, and a plurality of the electrode wires are combined in a mesh at a predetermined interval to form an electrode body, and Water retention mats are disposed on both the inner and outer sides of the electrode body, and a net is additionally provided on the outer surface of the water retention mat located on the outer side,
An electrode panel is formed by integrally mounting and fixing the electrode body and each of the water retaining mats to a mounting frame, and water for electrolysis is retained in each of the water retaining mats of the electrode panel. The electrode body is connected to the anode side of the DC power supply while the reinforcing member is fixed to the surface of the existing concrete, and the electrode body is connected to the anode side of the DC power supply. A narrow groove is engraved from the groove, an iron wire is buried in the groove and mortar is filled, the iron wire is connected to the cathode side of the DC power supply, and then a DC voltage from the DC power supply is applied to the electrode body and the iron wire. In this way, electric discharge with high current density is created by discharging from each of the sharp parts, and the water for electrolysis in each of the water retention mats is subjected to the electroosmotic action during the electrokinetic phenomenon, so that the existing core is discharged. The wetted cement part in the cleat reaches the iron wire of the cathode, and at the same time, electrolysis occurs, and the salt present in the pores in the concrete becomes chlorine ions and is discharged out of the concrete system by electrophoresis, and sodium Becomes a hydroxyl group (OH ⁻ ) in the vicinity of the iron wire as the cathode together with the electroosmotic water, regenerates the concrete neutralized with the alkaline water having a high pH of about 12, and converts the zinc plated on the electrode body into zinc ions by electrolysis. A method for repairing degraded concrete, wherein the iron wire is adhered to the iron wire by electrophoresis to protect the iron wire in a plated state. 3. The method for repairing degraded concrete according to claim 1, wherein the electrode wires constituting the electrode body are barbed wires. 4. An electrode body comprising: a wire mesh iron wire formed by combining iron wires in a mesh shape; one or a plurality of short iron wires having a sharp end and having a sharp end at a fixed interval. 3. The method for repairing deteriorated concrete according to claim 1, wherein the method is radially protruding and galvanized as a whole. 5. A single iron wire or a plurality of short iron wires having a sharp end at a predetermined interval with one or a plurality of iron wires are bound and fixed, and each of said sharp portions is radially formed. The entire body is protruded and galvanized to form an electrode wire having the sharp portion as a discharge terminal, and a plurality of the electrode wires are combined in a mesh at a predetermined interval to form an electrode body, and Water retention mats are disposed on both the inner and outer sides of the electrode body, and a net is additionally provided on the outer surface of the water retention mat located on the outer side,
An electrode panel for use in a method for repairing deteriorated concrete, wherein the electrode body and each of the water retention mats are integrally mounted and fixed to a mounting frame. 6. The electrode panel used in the method for repairing degraded concrete according to claim 5, wherein the electrode wires constituting the electrode main body are barbed wire. 7. An electrode body comprising: a wire mesh iron wire formed by combining iron wires in a mesh form; and bundling one or a plurality of short iron wires having a sharp end and a sharp end at a constant interval. 6. The electrode panel used in the method for repairing degraded concrete according to claim 5, wherein said sharpened portions are fixedly adhered and radially protrude, and the entire surface is galvanized.