JP2020172840A - Demolition method of reinforcement concrete and demolition device thereof - Google Patents

Abstract

To provide a demolition method of reinforcement concrete capable of breaking concrete by electric conduction heating of an arranged steel bar and removing danger of heat damage of an electric insulation coat of a cable for transmitting high current from an electric power supply to the steel bar even when the steel bar is heated to high temperature.SOLUTION: In demolishing a block 10 reinforced by a steel bar 20 penetrating a concrete part 10a, two locations of the steel bar 20 are arranged to be an exposed part 20a, 20a exposed from the block 10, a metallic electrode 70 having heat radiation function attached to a tip part of a conductive wire coated with a resin-made electric insulation coat constituting a cable 60 extending from a DC power supply 30 is connected to each exposed part 20a, and while applying DC current of 3000 A at at least 12 V from the DC power supply 30 to the steel bar 20 so as to break the concrete part 10a by the electric conduction of the steel bar 20, the heat is radiated from the electrode 70 so that the electric insulation coat of the cable 60 is not damaged due to the heat transferred from the steel bar 20 energized and heated.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method of dismantling reinforced concrete reinforced with a metal reinforcing material penetrating a concrete portion and a dismantling device thereof.

It is necessary to dismantle old reinforced concrete in order to renew concrete structures such as buildings and bridges that use reinforced concrete in which metal reinforcing materials such as reinforcing bars penetrate the concrete part. As a method for dismantling such reinforced concrete, Patent Document 1 below describes a method of energizing and heating a metal material which is a core material of a concrete building containing a metal material. Further, in Patent Document 2 below, a group of energizing dedicated reinforcing bars is arranged between the tension reinforcing bars and the compressing reinforcing bars of the main reinforcing bars arranged on the thick concrete slab, and the main reinforcing bars and the energizing dedicated reinforcing bars are sequentially energized and heated. It describes how to dismantle a thick concrete slab.

JP-A-59-233072 Japanese Unexamined Patent Publication No. 8-68215

According to the method described in Patent Document 1 described above, the energization heating of a metal material causes thermal deterioration of concrete, thermal decomposition steam explosion of water of crystallization in concrete, thermal expansion of metal material, and the like, resulting in cracks in concrete. Etc. can be generated. However, in order to further dismantle the concrete, it was necessary to use a secondary breaking means such as a hydraulic breaker. Further, according to the method described in Patent Document 2, it is necessary to arrange a group of dedicated reinforcing bars for energization between the tension bar and the compression bar of the main reinforcing bar in advance, and the design and construction of the concrete slab can be performed. It's complicated.

According to the study of the present inventor, in order to sufficiently destroy the concrete by energizing and heating the metal material reinforced in the concrete, a high current capable of energizing and heating the reinforced metal material to a high temperature of 1000 ° C. or higher is applied to the metal. It is necessary to apply it to the material, and if the metal material is heated to a high temperature of 1000 ° C or higher, the electrical insulation coating of the cable that transmits a high current from the power supply to the metal material may deteriorate due to the heat from the metal material. The problem was found.

The present invention has been made to solve the above-mentioned problems, and the concrete can be sufficiently destroyed by energizing and heating the metal material laid on the concrete, and even if the metal material is heated to a high temperature, the metal material is supplied from the power source. It is an object of the present invention to provide a method for disassembling reinforced concrete and a disassembling device thereof, which can eliminate the risk of damaging the electrical insulating coating of a cable that transmits a high current.

In the method for disassembling the reinforcing concrete according to the present invention, which has been made to achieve the above object, the reinforcing concrete reinforced with the metal reinforcing material penetrating the concrete portion is disassembled by energizing and heating the metal reinforcing material. At that time, the two parts of the metal reinforcing material are formed in the exposed part exposed from the concrete part, and the tip of the conductive wire coated with the resin electric insulating film constituting the cable extending from the DC power supply is formed. After mounting a metal electrode having a heat dissipation function, the electrode is connected to each of the exposed portions of the metal reinforcing material, and the metal reinforcing material is energized and heated to destroy the concrete portion. While applying a DC current of at least 12 V and 3000 A from the power source to the metal reinforcing material, the heat is so that the insulating coating constituting the cable is not damaged by the heat transferred from the metal reinforcing material heated by energization. Is radiated from the electrode.

Reinforcing bars or steel frames are used as the metal reinforcing material, and both ends of the reinforcing bars or steel frames are exposed from the reinforcing concrete so that they can be connected to the electrodes, and the connecting surface of the exposed parts to the electrodes. Is preferable because the exposed portion of the reinforcing bar or the steel frame and the electrode can be reliably connected by covering the surface with a conductive film.

As the metal reinforcing material, a deformed reinforcing bar whose surface is formed on an uneven surface is used, and the exposed portion of the deformed reinforcing bar connected to the electrode is covered with a metal foil so as to be a smooth surface. Therefore, it is preferable that the exposed portion of the deformed reinforcing bar and the electrode can be reliably connected.

It is preferable that an electrode made of copper or an alloy thereof is used as the electrode, and at least a part of the surface of the electrode is formed as a concavo-convex heat radiating surface, so that the conductivity and heat radiating function of the electrode can be further improved.

Further, the reinforcing concrete dismantling device according to the present invention is a dismantling device that dismantles a reinforcing concrete reinforced with a metal reinforcing material penetrating a concrete portion by energizing and heating the metal reinforcing material, and the metal. A DC power supply capable of applying a DC current of at least 12 V and 3000 A to the two exposed parts of the metal reinforcing material exposed from the concrete portion and a DC power supply extending from the DC power supply so that the reinforcing material is energized and heated. , A cable in which a conductive wire that transmits a direct current to the metal reinforcing material is coated with a resin electric insulating coating, and a cable that is attached to the tip of the conductive wire and both exposed portions of the metal reinforcing material. The electrode is provided with a metal electrode connected to the cable, and the electrode dissipates the heat so that the electric insulating coating constituting the cable is not damaged by the heat transferred from the metal reinforcing material heated by electric current. It is characterized by having a heat dissipation function.

The metal reinforcing material is a reinforcing bar or a steel frame, and is formed in an exposed portion exposed from the concrete portion so that each of both ends of the reinforcing bar or the steel frame is connected to the electrode, and the exposed portion of the exposed portion. It is preferable that the connecting surface with the electrode is covered with the conductive film so that the exposed portion of the reinforcing bar or the steel frame and the electrode are surely connected.

The metal reinforcing material is a deformed reinforcing bar whose surface is formed on an uneven surface, and is made of a metal foil so that the connecting surface of the exposed portion of the deformed reinforcing bar connected to the electrode to the electrode becomes a smooth surface. By being covered, the exposed portion of the deformed reinforcing bar and the electrode are securely connected, which is preferable.

It is preferable that the electrode is made of copper or an alloy thereof and at least a part of the surface of the electrode is formed as an uneven heat radiating surface, so that the conductivity and heat radiating function of the electrode are further improved.

According to the present invention, since a high DC current of at least 12 V and 3000 A can be applied to the two exposed parts of the metal reinforcing material exposed from the concrete part of the reinforced concrete, the concrete can be sufficiently destroyed at a high temperature. The metal reinforcing material inside the part can be energized and heated. Moreover, since the heat generated by the heat transfer from the metal reinforcing material that has been energized and heated to a high temperature is dissipated by the electrodes having a heat dissipation function, the resin of the cable that transmits a high DC current from the DC power supply to the exposed part of the metal reinforcing material. It is possible to prevent thermal damage to the electrically insulating coating made of the product.

It is the schematic explaining an example of the dismantling apparatus of the reinforced concrete which concerns on this invention. It is a front view and the side view of the electrode used in the dismantling device of the reinforced concrete shown in FIG. Partial front view showing the state of the end of the deformed reinforcing bar connected to the electrode when a deformed reinforcing bar having annular ribs provided at predetermined intervals and having an uneven surface is used as the metal reinforcing material. And a partial cross-sectional view. It is explanatory drawing explaining the connection between the end portion of a reinforcing bar and an electrode when a U-shaped reinforcing bar is used as a metal reinforcing material, or when it is going to disassemble the middle part of a reinforced concrete.

Hereinafter, the present invention will be described in detail, but the scope of the present invention is not limited thereto.

An example of the reinforced concrete dismantling device according to the present invention will be described with reference to the schematic view shown in FIG. In the block 10 as reinforcing concrete shown in FIG. 1, a plurality of reinforcing bars 20 which are main bars as a metal reinforcing material penetrate the concrete portion 10a, and each end portion thereof is exposed portion 20a protruding from both end surfaces of the block 10. It is formed. Further, each of the reinforcing bars 20 in the concrete portion 10a is restrained from each other by a plurality of reinforcing bars 20b arranged so as to be orthogonal to the reinforcing bars 20. The reinforcing bar 20 and the band bar 20b are integrated by a binding wire.

The dismantling device for disassembling the block 10 includes a DC power supply 30, a controller 40 that adjusts the voltage and current value of the DC current supplied from the DC power supply 30, and a distribution that distributes the DC current adjusted by the controller 40. A device 50, a plurality of cables 60 for transmitting the direct current distributed by the distributor 50 to the exposed portion 20a of the reinforcing bar 20, and a predetermined cable 60 provided at each end of the cable 60 on the exposed portion 20a side of the reinforcing bar 20. It is composed of a metal electrode 70 mounted on the exposed portion 20a of the reinforcing bar 20 of the above.

The DC power supply 30 may be a single DC generator as long as it is at least 12 V and can supply a DC current of 3000 A, and is composed of an AC generator 30a and an inverter type DC converter 30b as shown in FIG. It is preferable to do so. As the alternator 30a, it is preferable to use an internal-combustion power generator that uses light oil or gasoline as fuel because it can be used even at a construction site without existing power supply equipment. Further, it is preferable that the alternating current supplied from the alternator 30a to the inverter type direct current converter 30b is a three-phase alternating current because a stable direct current can be supplied from the inverter type direct current converter 30b to the reinforcing bar 20. It is preferable for safety that the upper limit of the DC current that can be supplied by the DC power supply 30 is 50 V and 6000 A.
By mounting pulleys on the bases of the AC generator 30a and the inverter type DC converter 30b, each device can be easily transported.

The direct current supplied from the direct current power source 30 is adjusted to a desired voltage and current value by the controller 40, and is transmitted to the distributor 50. The controller 40 is provided with a timer (not shown), and can control the application time of the direct current to the reinforcing bar 20 of the block 10.

The direct current controlled to the desired voltage and current value by the controller 40 is transmitted to the distributor 50 and applied to the exposed portion 20a of the predetermined reinforcing bar 20 protruding from both end faces of the block 10 via the cable 60 and the electrode 70. It will be distributed as it is. In the cable 60, a conductive wire such as a copper wire is covered with an electrically insulating coating made of resin, and an electrode 70 is provided at the tip of the conductive wire. The positive electrode 70 and the negative electrode 70 are attached to a predetermined exposed portion 20a of the reinforcing bar 20 to electrically connect the cable 60 and the reinforcing bar 20.

As shown in FIG. 2B, the electrode 70 is divided into two metal rectangular blocks 70a and 70b, and is integrated by three bolts 72. A recess 74 is formed on each of the divided surfaces of the rectangular blocks 70a and 70b, and the exposed portion 20a of the reinforcing bar 20 is inserted by integrating the rectangular blocks 70a and 70b with three bolts 72. An insertion hole to be fixed is formed. A conductive coating 22 is formed on the outer peripheral surface of the exposed portion 20a of the reinforcing bar 20 that is inserted and fixed in the insertion hole after the dirt such as rust is removed by a cleaning agent and / or a waste cloth or the like. The electrical connection between the outer peripheral surface of the inserted exposed portion 20a and the inner peripheral surface of the insertion hole portion is guaranteed. As the conductive coating 22, a metal foil can be preferably used for the reinforcing bar 20 having a substantially circular cross-sectional shape. However, such a conductive coating 22 is unnecessary as long as the outer peripheral surface of the exposed portion 20a from which the dirt has been removed and the inner peripheral surface of the insertion hole portion can be in direct contact with each other.

Further, to each of the three bolts 72, the flange portion 62 connected to the copper wire of the cable 60 can be connected to the flat surface of the electrode 70 via the washer 73. In FIG. 2, the flange portion 62 connected to the copper electric wire of the cable 60 is connected to the flat surface of the electrode 70 via the washer 73 only to the bolt 72 in the central portion.

When a DC current of at least 12 V and 3000 A is applied to the reinforcing bar 20 to energize and heat the reinforcing bar 20, the reinforcing bar 20 is heated to a temperature exceeding 1000 ° C., so that the reinforcing bar 20 is transmitted from the heated reinforcing bar 20 through the electrode 70. The heated heat may damage the resin electrical insulating coating of the cable 60, the instrument of the controller 40, and the like. Therefore, the electrode 70 has a heat dissipation function of radiating heat from the heated reinforcing bar 20 and preventing damage to the electrical insulating coating of the cable 60. As the electrode 70 having such a heat dissipation function, the rectangular blocks 70a and 70b are formed of a copper alloy such as copper or a chromium copper alloy having good conductivity and thermal conductivity, and as shown in FIG. 2, the reinforcing bar 20 is formed. A large number of grooves 76 are formed over the entire surface of the end face where the hole into which the exposed portion 20a is inserted and the end face on the opposite side thereof are opened, and the surface area of the electrode 70 is made as large as possible to dissipate heat. Is improving.

When dismantling the block 10 using the reinforcing concrete dismantling device shown in FIGS. 1 and 2, first, each of the exposed parts 20a of the reinforcing bar 20 penetrating the concrete part 10a is rusted by a cleaning agent and / or a waste cloth or the like. After removing stains such as, a conductive auxiliary coating agent, for example, Nikkeijotal (trade name) manufactured by Shizuoka Kosan Co., Ltd. is applied to form a conductive coating 22. Next, an electrode 70 of the + pole connected to the tip of the cable 60 extending from the + pole of the distributor 50 is attached to one of the exposed portions 20a of the predetermined reinforcing bar 20, and the electrode 70 is also distributed to the other exposed portion 20a. By attaching the electrode 70 of the-pole connected to the tip of the cable 60 extending from the-pole of the vessel 50, the reinforcing bar 20 can be energized and heated. In the block 10 shown in FIG. 1, electrodes 70 are attached to exposed portions 20a of all the reinforcing bars 20 exposed from both ends of the block 10, and all the reinforcing bars 20 can be energized and heated.

After that, the AC generator 30a is driven to supply three-phase AC to the inverter type DC converter 30b, and a DC current of at least 12V and 3000A is transmitted from the inverter type DC converter 30b to the controller 40. The controller 40 adjusts the concrete portion 10a of the block 10 to a voltage and current value that can destroy the concrete portion 10a, and supplies power to the distributor 50. From the distributor 50, a direct current is applied to all the reinforcing bars 20 via the cable 60 and the electrode 70, and the reinforcing bars 20 are energized and heated to a high temperature of 1200 to 1500 ° C. to destroy the concrete portion 10a. The time for applying the direct current to the reinforcing bar 20 is controlled by a timer provided in the controller 40 so as to be about 10 to 20 minutes. This is because even if the reinforcing bar 20 is energized and heated for more than 20 minutes, the degree of destruction of the concrete portion 10a has reached saturation.
The voltage and current values applied to the reinforcing bar 20 are measured at a temperature of 1200 ° C. or higher by repelling the concrete portion 10a on a trial basis to partially expose a part of the reinforcing bar 20 and measuring with an infrared thermometer or the like. It is preferable to obtain the value to be heated in about 20 minutes in advance.

Since the reinforcing bar 20 is energized and heated to 1200 ° C. or higher in this way, the heat is transferred to the exposed portion 20a of the reinforcing bar 20. Although a part of the heat transferred to the exposed portion 20a is dissipated from the exposed portion 20a itself, the exposed portion 20a is heated to 450 to 500 ° C. If the heat of the exposed portion 20a is transferred to the cable 60, the resin electrical insulating coating of the cable 60, the instrument of the controller 40, and the like may be damaged. In this regard, the electrode 70 shown in FIGS. 1 and 2 is formed of a copper alloy such as copper or a chromium copper alloy having good conductivity and thermal conductivity, and has a hole into which the exposed portion 20a of the reinforcing bar 20 is inserted. The surface area of the electrode 70 is expanded as much as possible by a large number of grooves 76 formed over the entire surface of the opened end face and the end face on the opposite side thereof. Such an electrode 70 can exhibit excellent heat dissipation performance in combination with a metal having good thermal conductivity forming itself and an enlarged surface area, and heat is transferred to each of the exposed portions 20a. The heat is sufficiently dissipated by the mounted electrode 70. As a result, the temperature of the conductive wire of the cable 60 and the like can be lowered to about 50 to 40 ° C., and the possibility that the electrical insulating coating of the cable 60 and the instrument of the controller 40 are damaged by heat can be eliminated.

The reason why the concrete portion 10a can be broken by energizing the reinforcing bar 20 to 1200 ° C. or higher for about 10 to 20 minutes is considered as follows. When the reinforcing bar 20 is energized and heated, stress is applied to the concrete portion 10a by the thermally expanded reinforcing bar 20 due to the difference in the coefficient of thermal expansion between the reinforcing bar 20 and the concrete portion 10a, and the moisture contained in the concrete portion 10a is also contained in the reinforcing bar 20. It expands with the heat from. The expansion of the reinforcing bar 20 itself and the expansion of the water content in the concrete portion 10a combine to cause a crack in the concrete portion 10a. Due to the heat of such energization heating, the binding wire that integrates the band bar 20b and the reinforcing bar 20 has also disappeared.

Next, when the application of the direct current to the reinforcing bar 20 is completed and the reinforcing bar 20 and the concrete portion 10a are cooled, the adhesive force between the reinforcing bar 20 and the concrete portion 10a is lost, and the reinforcing bar 20 can be easily pulled out. it can. Further, since the concrete portion 10a from which the reinforcing bar 20 has been pulled out has fine cracks up to the portion surrounded by the reinforcing bar 20b, it can be easily crushed by a slight impact with a hammer or the like, and the reinforcing bar 20b is also taken out. be able to.

By the way, in order to improve the adhesion between the concrete portion 10a and the reinforcing bar, a deformed reinforcing bar whose surface is formed into an uneven surface by ribs, protrusions or the like is used as the reinforcing bar. As an example of the deformed reinforcing bar, FIG. 3 shows the deformed reinforcing bar 24. In the deformed reinforcing bar 24, annular ribs 14a formed on the peripheral surface of the reinforcing bar main body 24a are formed at predetermined intervals along the longitudinal direction of the reinforcing bar main body 24a. In the block 10 in which such a deformed reinforcing bar 24 is used, the surface of the exposed portion 25 protruding from both end surfaces thereof is also an uneven surface, and the inner wall surface of the insertion hole portion of the electrode 70 into which the exposed portion 25 is inserted is also an uneven surface. Adhesion with and may decrease. After removing stains on the surface of the exposed portion 25 of the deformed reinforcing bar 24 with a cleaning agent and / or a waste cloth or the like, the copper foil 26 as a metal foil is wound several times as shown in the enlarged partial cross-sectional view of FIG. As a result, the surface can be made as smooth as possible, and the adhesion with the inner wall surface of the insertion hole portion of the electrode 70 can be improved.

As the reinforcing bar, the U-shaped reinforcing bar 28 shown in FIG. 4A may be used. In the block 10 in which such a reinforcing bar 28 is used, each end portion of the reinforcing bar 28 is exposed on one of the end faces thereof to form an exposed portion 28a, and an electrode 70 attached to the tip of the cable 60 is connected to each exposed portion 28a. By doing so, the reinforcing bar 28 can be energized and heated.
Further, as shown in FIG. 4B, after repelling two places of the concrete portion 10a of the columnar block 10 to expose each intermediate portion of the reinforcing bar 20 to form an exposed portion 20a, each of the exposed portions 20a. By connecting the electrode 70 attached to the tip of the cable 60 to, the intermediate portion of the reinforcing bar 20 can be energized and heated.
The method for dismantling the reinforced concrete and the dismantling device thereof according to the present invention can also be applied to the dismantling of the reinforced concrete in which the H steel material is used as the metal reinforcing material.

As shown in FIGS. 1 and 4, as a means for exposing the reinforcing bar 20 or its end or intermediate portion from the concrete portion 10a, a commonly used concrete crusher such as a rock drill can be used. Further, as a means for taking out the block 10 shown in FIG. 1 from the concrete building, a fusing device described in JP-A-48-885772 or the like can be used. This fusing device mixes high-temperature combustion gas, which is a mixture of combustible gas such as acetylene gas and propane gas, and oxygen gas, and metal powder, and sprays it onto a concrete structure at a predetermined site to melt concrete and reinforcing bars. And cut it. However, when the concrete or the reinforcing bar is melted and cut in this way to obtain the block 10, it is necessary to expose the end portion of the reinforcing bar 20 from the end face of the block 10 by mechanical means or the like to form the exposed portion 20b. ..

When the block 10 reinforced with a plurality of reinforcing bars 20 is disassembled using the dismantling device shown in FIGS. 1 to 4, the plurality of reinforcing bars 20 can be taken out while retaining the prototype, and can be easily transported by car or the like. can do. Further, the concrete portion 10a can be easily crushed into small pieces by the impact of a hammer or the like, and the strip 20b can be taken out without performing secondary dismantling. Further, the crushed concrete crushed in this way is finely crushed as compared with the conventional mechanically crushed concrete, and can be suitably used for recycled concrete such as gravel. Moreover, the block 10 can be disassembled with less noise, vibration, and dust as compared with the conventional mechanical disassembly.

According to the present invention, it is possible to easily disassemble the reinforced concrete reinforced with a metal reinforcing material such as a reinforcing bar penetrating the concrete portion and reduce noise, vibration, and dust. Therefore, it is possible to easily dismantle concrete buildings such as old buildings and bridges where a lot of reinforced concrete is used and reduce noise, vibration, and dust, and promote the renewal of old concrete buildings. be able to.

10 Block 10a Concrete part 14a Circular rib 20,28 Reinforcing bar 20a, 25,28a Exposed part 20b Band bar 22 Conductive coating 24 Deformed reinforcing bar 24a Reinforcing bar body 26 Copper foil 30 DC power supply 30a AC generator 30b Inverter type DC converter 40 controller 50 Distributor 60 Cable 62 Flange 70 Electrode 70a, 70b Rectangular block 72 Bolt 73 Seat 74 Recess 76 Groove

In the method of disassembling the reinforcing concrete according to the present invention, which has been made to achieve the above object, the reinforcing bar is energized and heated by reinforcing steel as a metal reinforcing material penetrating the concrete portion or reinforcing concrete reinforced with a steel frame. radiating when dismantling, the two portions of the reinforcing bars or steel and exposed portion exposed from the concrete section, the distal end portion of the conductive wire coated with a resin of an electrical insulating film constituting the cable extending from the dc power supply After attaching the functional metal electrode, the reinforcing bar or the steel frame is connected to the connecting surface covered with the conductive coating of each of the exposed portions of the reinforcing bar or the steel frame , and then the reinforcing bar or the steel frame is energized and heated. While applying a DC current of at least 12 V and 3000 A from the DC power source to the reinforcing bar or steel frame so as to destroy the concrete portion, the electricity constituting the cable by the heat transferred from the reinforcing bar or steel frame heated by energization. It is characterized in that the heat is radiated from the electrode so that the insulating film is not damaged.

It is preferable that both ends of the reinforcing bar or the steel frame are exposed portions exposed from the reinforced concrete so that they can be connected to the electrodes .

As the reinforcing bar , a deformed reinforcing bar whose surface is formed on an uneven surface is used, and the exposed portion of the deformed reinforcing bar connected to the electrode is covered with a metal foil so as to be a smooth surface. It is preferable that the exposed portion of the reinforcing bar and the electrode can be reliably connected.

Further, the reinforcing concrete dismantling device according to the present invention is a dismantling device that dismantles a reinforcing concrete reinforced with a reinforcing bar or a steel frame as a metal reinforcing material penetrating a concrete portion by energizing and heating the reinforcing bar or the steel frame. From the DC power supply that can apply a DC current of at least 12V and 3000A to the two exposed parts of the reinforcing bar or the steel frame exposed from the concrete portion so that the reinforcing bar or the steel frame is energized and heated. A cable in which a conductive wire extending and transmitting the direct current to the reinforcing bar or the steel frame is coated with an electric insulating coating made of resin, and a cable attached to the tip of the conductive wire, and both exposed portions of the reinforcing bar or the steel frame. Each of the electrodes is provided with a metal electrode connected to a connecting surface covered with a conductive coating, and the electrode is formed by the electrically insulating coating forming the cable by heat from the reinforcing bar or the steel frame which is electrically heated. It is characterized by having a heat dissipation function of radiating the heat so as not to be damaged.

It is preferable that each of both ends of the reinforcing bar or the steel frame is formed in an exposed portion exposed from the concrete portion so as to be connected to the electrode .

The reinforcing bar is a deformed reinforcing bar whose surface is formed on an uneven surface, and is covered with a metal foil so that the connecting surface of the exposed portion of the deformed reinforcing bar connected to the electrode with the electrode becomes a smooth surface. This is preferable because the exposed portion of the deformed reinforcing bar and the electrode are securely connected.

Claims (8)

When dismantling reinforced concrete reinforced with a metal reinforcing material that penetrates the concrete part by energizing and heating the metal reinforcing material.
The two parts of the metal reinforcing material are formed in the exposed part exposed from the concrete part, and the tip of the conductive wire covered with the resin electric insulating coating constituting the cable extending from the DC power supply has a heat dissipation function. After attaching the metal electrode to have
The electrodes are connected to each of the exposed portions of the metal reinforcing material, and the metal reinforcing material is energized and heated to destroy the concrete portion at least 12 V and 3000 A from the DC power source to the metal reinforcing material. Reinforcement characterized in that the heat is radiated from the electrodes so that the electrical insulating coating constituting the cable is not damaged by the heat transferred from the metal reinforcing material heated by energization while applying a direct current. How to dismantle concrete. A reinforcing bar or a steel frame is used as the metal reinforcing material, and each of both ends of the reinforcing bar or the steel frame is exposed from the reinforcing concrete so that it can be connected to the electrode, and the connecting surface of the exposed portion to the electrode. The method for disassembling reinforced concrete according to claim 1, wherein the reinforced concrete is covered with a conductive film. As the metal reinforcing material, a deformed reinforcing bar whose surface is formed on an uneven surface is used, and the exposed portion of the deformed reinforcing bar connected to the electrode is covered with a metal foil so as to be a smooth surface. The method for disassembling reinforced concrete according to claim 2. The reinforcing concrete according to any one of claims 1 to 3, wherein an electrode made of copper or an alloy thereof is used as the electrode, and at least a part of the surface of the electrode is formed as a concavo-convex heat radiation surface. Dismantling method. A dismantling device that dismantles reinforced concrete reinforced with a metal reinforcing material that penetrates the concrete portion by energizing and heating the metal reinforcing material.
A DC power supply capable of applying a DC current of at least 12 V and 3000 A to the two exposed portions of the metal reinforcing material exposed from the concrete portion so that the metal reinforcing material is energized and heated.
A cable in which a conductive wire extending from the DC power source and transmitting the DC current to the metal reinforcing material is coated with a resin electric insulating coating, and
It is provided with a metal electrode attached to the tip of the conductive wire and connected to each of both exposed portions of the metal reinforcing material.
The electrode is a heat-dissipating device for reinforcing concrete, which has a heat-dissipating function of radiating heat so that the electric insulating coating constituting the cable is not damaged by heat from the metal reinforcing material heated by energization. .. The metal reinforcing material is a reinforcing bar or a steel frame, and is formed in an exposed portion exposed from the concrete portion so that each of both ends of the reinforcing bar or the steel frame is connected to the electrode, and the exposed portion of the exposed portion. The reinforced concrete dismantling device according to claim 5, wherein the connecting surface with the electrode is covered with a conductive film. The metal reinforcing material is a deformed reinforcing bar whose surface is formed on an uneven surface, and is made of a metal foil so that the connecting surface of the exposed portion of the deformed reinforcing bar connected to the electrode to the electrode becomes a smooth surface. The reinforced concrete dismantling device according to claim 6, wherein the reinforced concrete is covered. The reinforced concrete according to any one of claims 5 to 7, wherein the electrode is made of copper or an alloy thereof, and at least a part of the surface of the electrode is formed as an uneven heat radiating surface. Dismantling device.

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