Stripping device, stripping method, and program

Abstract

A peeling device (1) includes: an electrolyte sheet (11) attached to a concrete surface; a first electrode (12) connected to the electrolyte sheet (11); a second electrode (13) connected to an exposed reinforcing steel rod; a potential control unit (14) that applies a voltage to the second electrode (13), with the first electrode (12) being taken as a reference electrode, to control the potential generated in the second electrode (13) to fall in a predetermined range; and a current measurement unit (15) that continuously measures the current value of a current flowing from the second electrode (13) to the first electrode (12).

Description

Technical Field

[0001] The present disclosure relates to a peeling device, a peeling method, and a program for assisting in the repair of a concrete structure containing reinforcing bars.

Background Art

[0002] Conventionally, it has been possible to identify the area that needs repair of a concrete structure containing reinforcing bars by a non-destructive evaluation method such as the natural potential measurement method, but the evaluation results do not go beyond the range of speculation. For this reason, the identification of the area that needs repair of a concrete structure containing reinforcing bars has been carried out by peeling off the concrete until the corrosion of the reinforcing bars cannot be visually confirmed. Peeling or peeling out refers to "small-scale construction of the concrete part", and mainly includes operations such as cutting, drilling, and scraping the concrete.

[0003] Generally, steel corrosion is not allowed in the maintenance and management of a concrete structure containing reinforcing bars. This is because the limit value Slim of the steel corrosion depth is limited to a small value calculated by the following formula (1). FIG. 8 is a diagram for explaining the deterioration of a conventional exposed reinforcing bar part and the area required for repair. In FIG. 8, the cover c [mm] refers to the minimum distance from the concrete surface to the reinforcing bar. Limit value of steel corrosion depth Slim = 3.81×10 -4 ×c [mm] (1) For this reason, when the corrosion and exposure of the reinforcing bars become apparent, the exposed reinforcing bar part is repaired, so the subsequent deterioration progress process of the reinforcing bar corrosion is not subject to management. Exposed reinforcement refers to a state in which the reinforcing bars inside the concrete are corroded and deformed, causing the concrete to float and peel off, and the reinforcing bars are exposed. Regarding the MH (manhole) upper floor slab, the subsequent deterioration progress process of the reinforcing bar corrosion in the exposed reinforcing bar part remains unclear.

[0004] As shown in the photograph in Figure 8, rebar corrosion is observed in the manhole slab above the concrete block. The left side of Figure 8 is a cross-sectional view of the area where rebar corrosion is observed in the manhole slab above the concrete block. Rust is observed in the exposed rebar, but the extent of corrosion beneath the concrete is unknown. There is a possibility that the rebar beneath the concrete is corroded near the exposed rebar, but the extent of this corrosion cannot be visually confirmed, so the area requiring rust removal and other repairs is unknown. Therefore, as shown in the right side of Figure 8, the area requiring rust removal and other repairs will be determined by visually checking for rebar corrosion during the concrete chipping process. If rebar is exposed, cross-sectional repair will be carried out, and repairs such as removal of deteriorated concrete, rust removal, and backfilling with mortar will be performed.

[0005] Non-patent document 1 describes standards for repairing existing concrete structures in the civil engineering field, with the aim of restoring or improving the durability of concrete structures. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] Hiroshi Katahira, et al., "Draft Manual for Repair Measures for Concrete Structures," Public Works Research Institute Document No. 4343, published August 2016. [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, visual inspection for corrosion detection may miss areas of corrosion where clear rust has not yet formed. Figure 9 illustrates macrocell corrosion at the boundary between a repaired and an unrepaired area. If a corroded area is overlooked, corrosion may progress in the unrepaired area, as shown in Figure 9. In particular, macrocell corrosion may progress at an accelerated rate at the boundary between the repaired and unrepaired areas. Note that in Figure 9, e ― These are excess electrons generated in the metal matrix due to the dissolution of metal (iron), and are consumed in processes such as oxygen reduction.

[0008] In view of these circumstances, the object of the present invention is to provide a peeling device, peeling method, and program that forcibly peel off concrete in areas of a structure containing reinforcing bars that are at risk of corrosion progression by electrochemical control, and identify the parts that require repair. [Means for solving the problem]

[0009] To solve the above problems, the peeling device according to this embodiment is a peeling device that assists in the repair of concrete structures containing reinforcing bars, and comprises an electrolyte sheet attached to the concrete surface, a first electrode connected to the electrolyte sheet, a second electrode connected to the exposed reinforcing bars, a potential control unit that applies a voltage to the second electrode using the first electrode as a reference electrode and controls the potential so that the potential generated at the second electrode falls within a predetermined range, and a current measuring unit that continuously measures the current value of the current flowing from the second electrode to the first electrode.

[0010] To solve the above problems, the peeling method according to this embodiment is a peeling method that assists in the repair of concrete structures containing reinforcing bars, and comprises the steps of: applying a voltage to a second electrode using a peeling device with a first electrode as a reference electrode and controlling the potential so that the potential generated at the second electrode falls within a predetermined range; continuously measuring the current value of the current flowing from the second electrode to the first electrode; and determining whether the concrete has peeled off based on whether the measured current value falls within a judgment criterion interval from a first threshold to a second threshold.

[0011] To solve the above problems, the program according to this embodiment causes the computer to function as the peeling device. [Effects of the Invention]

[0012] According to this disclosure, by forcibly peeling off concrete in areas where corrosion is likely to progress using electrochemical control, and exposing the repaired area, it becomes possible to suppress the occurrence of further repairs near the repaired area. [Brief explanation of the drawing]

[0013] [Figure 1] It is a figure showing a configuration example of a peeling device according to the first embodiment. [Figure 2] It is a figure explaining the operation of the peeling device according to the first embodiment. [Figure 3] It is a figure in which a corrosion promotion range of a reinforcing bar is entered in a potential-pH diagram of Fe. [Figure 4] It is a flowchart showing an example of a peeling method executed by the peeling device according to the first embodiment. [Figure 5] It is a figure showing a configuration example of a peeling device according to the second embodiment. [Figure 6] It is a flowchart showing an example of a peeling method executed by the peeling device according to the second embodiment. [Figure 7] It is a block diagram showing a schematic configuration of a computer functioning as a peeling device. [Figure 8] It is a figure explaining deterioration of a conventional exposed reinforcement part and a region necessary for repair. [Figure 9] It is a figure explaining macrocell corrosion at a boundary between a repaired part and an unrepaired part.

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and can be variously modified and implemented within the scope of the gist.

[0015] (First Embodiment) FIG. 1 is a diagram showing a configuration example of a peeling device 1 according to the first embodiment. As shown in FIG. 1, the peeling device 1 includes an electrolyte sheet 11, a first electrode 12, a second electrode 13, a potential control unit 14, and a current measurement unit 15. The peeling device 1 assists in repairing a concrete structure containing a reinforcing bar 3.

[0016] The control arithmetic circuit (controller) 20 is constituted by a potential control unit 14 and a current measurement unit 15. The control arithmetic circuit 20 may be constituted by dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array), or may be constituted by a processor, or may be constituted including both.

[0017] The electrolyte sheet 11 is affixed to the surface of the concrete 2 and promotes the corrosion of the concrete 2 by voltage application. The electrolyte sheet 11 is obtained by gelling an aqueous solution containing an electrolyte with a gelling agent such as agar. The electrolyte sheet 11 enables surface voltage control by mixing electrolytes such as copper sulfate and potassium chloride. The electrolyte sheet 11 is connected to a reference electrode 12A and a counter electrode 12B that constitute the first electrode 12 described later. For electrical connection, moisture and an electrolyte dissolved in the moisture are required, but an aqueous solution containing an electrolyte cannot be held on the surface of the concrete 2 as it is. However, by gelling the aqueous solution containing an electrolyte, it becomes possible to hold it on the surface of the concrete 2. In this sense, the electrolyte sheet 11 may be constituted by a sponge or the like containing an aqueous solution containing an electrolyte.

[0018] The first electrode 12 is connected to the electrolyte sheet 11. As shown in FIG. 1, the first electrode 12 is constituted by a reference electrode 12A and a counter electrode 12B. The second electrode 13 described later is a working electrode. The reference electrode 12A is an electrode that provides a reference point for potential when measuring the electrode potential. The working electrode 13 is an electrode used to obtain electrical signals such as current and potential related to the electrode reaction of the target substance. The counter electrode 12B is an electrode paired with the working electrode 13. The potential control unit 14 (hereinafter also referred to as a potentiostat 14) described later applies a voltage to the second electrode 13 (working electrode 13) using the reference electrode 12A of the first electrode 12 as a reference electrode. Since the input impedance of the potentiostat 14 on the reference electrode 12A side is set high, current flows between the working electrode 13 and the counter electrode 12B, and the reference electrode 12A maintains a stable potential.

[0019] The reference electrode 12A uses copper as the electrode material when copper sulfate is used as the electrolyte, and silver when potassium chloride is used as the electrolyte. When potassium chloride is used as the electrolyte, using silver as the electrode material allows the reference electrode 12A to function as a silver-silver chloride electrode.

[0020] The second electrode 13 is connected to the exposed reinforcing bar 3. The second electrode 13 functions as the working electrode 13. The second electrode 13 is attached to the exposed reinforcing bar 3 via a moisture-soaked sponge or conductive tape. By attaching the second electrode 13 via a sponge or conductive tape, surface conductivity can be ensured.

[0021] The potential control unit 14 uses the reference electrode 12A of the first electrode 12 connected to the electrolyte sheet 11 as the reference electrode and applies a voltage to the second electrode 13, controlling the potential so that the potential generated at the second electrode 13 falls within a predetermined range. The predetermined range of potential is -0.5V to +0.35V vs. SHE, where corrosion does not progress in the unneutralized region of the concrete, but only in the neutralized region. "vs. SHE" refers to the potential relative to the hydrogen electrode (0V).

[0022] Figure 2 is a diagram illustrating the operation of the peeling device according to the first embodiment. The potential control unit 14 applies a voltage to the exposed reinforcing bars, thereby accelerating the corrosion of the reinforcing bar portions that are susceptible to corrosion beneath the concrete 2, forcibly peeling off the concrete 2 and revealing the area to be repaired from the peeled-off portion. As shown in Figure 2, the potential control unit 14 increases the corrosion rate of the area beneath the concrete 2 where the reinforcing bar 3 may corrode by applying a voltage between the first electrode 12 mounted on the electrolyte sheet 11 and the second electrode 13 mounted on the exposed reinforcing bar 3 having rust r (hereinafter also referred to as corrosion product r). As a result, the concrete 2 can be forcibly peeled off due to the volume expansion of the corrosion product r, making it possible to replace chipping work. Furthermore, the reinforcing bar 3 in the area where the concrete 2 has peeled off is subjected to scraping and mortar backfilling to suppress further deterioration near the repaired area.

[0023] Concrete 2 is normally strongly alkaline with a pH of 12-13 due to the hydration of cement components, which produces a large amount of calcium hydroxide. However, when carbon dioxide in the air comes into contact with the surface of concrete 2, it chemically reacts with the calcium hydroxide, changing it into neutral calcium carbonate and water, causing concrete 2 to lose its alkalinity, a process called "neutralization." When concrete 2 is alkaline, a thin oxide film called a passivation film forms on the reinforcing steel 3, which acts as a rust preventative. However, as neutralization progresses and concrete 2 loses its alkalinity, it erodes the reinforcing steel, causing rust r to form on the reinforcing steel 3. This rust r leads to expansion, which in turn causes cracks in concrete 2.

[0024] Figure 3 is a diagram showing the potential-pH range of reinforcing steel corrosion acceleration on a potential-pH diagram of Fe inserted in Chapter 11 (2017) of the Thermal Spray Engineering Handbook of the Japan Thermal Spray Society. According to Figure 3, in the neutralized region where concrete 2 has undergone carbonation (the region where the pH is 8 or less in Figure 3), applying a voltage within the range of -0.5V to +0.35V vs. SHE accelerates the corrosion of reinforcing steel 3. On the other hand, in the non-neutralized region under alkaline conditions (the region where the pH is higher than 8 in Figure 3), corrosion does not progress.

[0025] The current measuring unit 15 continuously measures the current value of the current flowing from the second electrode 13 to the counter electrode 12B of the first electrode 12. When the potential control unit 14 starts potential control, the current measuring unit 15 measures the current value and outputs it to the potential control unit 14. The current value fluctuates rapidly due to the influence of non-Faraday current immediately after the start of potential control, so a waiting period of about 10 minutes is set after the start of potential control. The current value can be acquired at any time interval, but it is desirable to acquire it at intervals of 1 to 60 seconds. After the waiting period has elapsed, the current measuring unit 15 continuously measures the current value and outputs the measured value to the potential control unit 14.

[0026] The potential control unit 14 determines whether the concrete 2 has peeled by checking whether the current value measured by the current measurement unit 15 falls within a judgment criterion interval from a first threshold, which is the lower limit threshold, to a second threshold, which is the upper limit threshold. If the current value is within the judgment criterion interval, the current measurement is continued. If the current value deviates from the judgment criterion interval, the potential control is terminated. The potential control unit 14 acquires the time-dependent change in the current value received from the current measurement unit 15. If rebar corrosion is accelerated and cracks and peeling occur in the concrete 2, the electrolyte sheet 11 attached to the concrete surface will also be partially damaged, resulting in discontinuities in the current value. For this reason, in the process of acquiring the time-dependent change, the potential control unit 14 considers the point at which the current value deviates from the judgment criterion interval from the first threshold to the second threshold as the point at which the concrete 2 has peeled, and terminates the potential control. Hereinafter, the current value that deviates from the judgment criterion interval from the first threshold to the second threshold will also be referred to as an abnormal value.

[0027] Anomaly detection can be achieved by detecting outliers from the approximation curve obtained during continuous current measurement. The period for creating the approximation curve can be set arbitrarily, but it is desirable to set it to a period of at least 10 minutes from the most recent measurement. The approximation curve value is derived using any method such as least squares, maximum likelihood estimation, or K-nearest neighbors. If the measured value deviates by more than the error in the approximation period, or if the variability of the measured value deviates from an arbitrary significance level, it is determined that the value has deviated from the judgment interval from the first threshold (lower threshold) to the second threshold (upper threshold). Least squares is a method for processing measured values ​​with errors, which seeks the most likely relationship by minimizing the sum of the squares of those errors. Maximum likelihood estimation is a method in mathematical statistics for estimating the parameters of the probability distribution that maximizes the probability of obtaining given observed values ​​(samples). K-nearest neighbors is a classification method based on the closest training examples in the feature space, and is often used in pattern recognition.

[0028] Figure 4 is a flowchart showing an example of a peeling method performed by the peeling apparatus 1 according to the first embodiment.

[0029] In step S101, the worker attaches the electrolyte sheet 11 to the surface of the concrete 2, connects the first electrode 12 to the electrolyte sheet 11, and connects the second electrode 13 to the exposed reinforcing bar 3.

[0030] In step S102, the potential control unit 14 starts potential control. Specifically, the potential control unit 14 uses the reference electrode 12A of the first electrode 12 as the reference electrode, applies a voltage to the second electrode 13, and performs potential control so that the potential generated at the second electrode 13 falls within a predetermined range.

[0031] In step S103, the current measuring unit 15 waits for 10 minutes after the start of potential control without starting to measure the current value. This is because the current value increases or decreases rapidly immediately after the start of potential control due to the influence of non-Faraday current.

[0032] In step S104, the current measuring unit 15 continuously measures the current value of the current flowing from the second electrode 13 to the first electrode 12.

[0033] In step S105, the potential control unit 14 determines whether the concrete 2 has peeled off based on whether the current value measured by the current measurement unit 15 falls within a judgment criterion interval from a first threshold to a second threshold. If the current value is within the judgment criterion interval, the process returns to step S104. If the current value deviates from the judgment criterion interval, the potential control is terminated.

[0034] According to the peeling device 1 of this embodiment, the concrete 2 in the area where corrosion is likely to progress is forcibly peeled off by electrochemical control, exposing the repair area and thereby preventing the occurrence of further repairs near the repaired area. Furthermore, with the peeling device 1, by keeping the potential generated at the second electrode 13 within the limited range of -0.5V to +0.35V vs. SHE with respect to the reference electrode 12A, it is possible to suppress the progression of corrosion of reinforcing bars that remain passive under alkaline conditions, which are areas that do not require repair.

[0035] (Second embodiment) Figure 5 shows an example of the configuration of the peeling device 1' according to the second embodiment. As shown in Figure 5, the peeling device 1' includes an electrolyte sheet 11, a first electrode 12, a second electrode 13, a potential control unit 14', a current measuring unit 15, and a strain measuring unit 16. The peeling device 1' according to this embodiment differs from the peeling device 1 according to the first embodiment in that the functions of the potential control unit 14' are partially expanded and a strain measuring unit 16 is further included. For components identical to those in the first embodiment, the same reference numerals as in the first embodiment are used and descriptions are omitted as appropriate.

[0036] The control calculation circuit (controller) 20' is comprised of a potential control unit 14', a current measurement unit 15, and a strain measurement unit 16. The control calculation circuit 20' may be comprised of dedicated hardware such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field-Programmable Gate Array), or it may be comprised of a processor, or it may include both.

[0037] The strain measurement unit 16 has a strain gauge 16A, and by using the strain gauge 16A installed near the electrolyte sheet 11, it continuously measures the amount of strain generated inside the concrete and outputs the measured value to the potential control unit 14'.

[0038] The potential control unit 14' determines whether the amount of strain received from the strain measurement unit 16 falls within a third threshold. If the amount of strain is within the third threshold, it continues measuring the amount of strain. If the amount of strain exceeds the third threshold, it terminates the potential control.

[0039] Figure 6 is a flowchart showing an example of a peeling method performed by the peeling apparatus 1' according to the second embodiment.

[0040] In step S201, the worker attaches the electrolyte sheet 11 to the surface of the concrete 2, connects the first electrode 12 to the electrolyte sheet 11, and connects the second electrode 13 to the exposed reinforcing bar.

[0041] In step S202, the potential control unit 14' starts potential control. Specifically, the potential control unit 14' uses the reference electrode 12A of the first electrode 12 as the reference electrode, applies a voltage to the second electrode 13, and controls the potential so that the potential generated at the second electrode falls within a predetermined range.

[0042] In step S203, the current measuring unit 15 waits for 10 minutes after the start of potential control without starting to measure the current value. This is because the current value increases or decreases rapidly immediately after the start of potential control due to the influence of non-Faraday currents.

[0043] In step S204, the current measuring unit 15 continuously measures the current value of the current flowing from the second electrode 13 to the first electrode 12.

[0044] In step S205, the potential control unit 14' determines whether the concrete 2 has peeled off based on whether the current value measured by the current measuring unit 15 falls within a judgment criterion interval from a first threshold to a second threshold. If the current value is within the judgment criterion interval, the process proceeds to step S206. If the current value deviates from the judgment criterion interval, the potential control is terminated.

[0045] In step S206, the potential control unit 14' determines whether or not it is difficult to detect an abnormal value. If it is determined that it is not difficult to detect an abnormal value, the process returns to step S204. If it is determined that it is difficult to detect an abnormal value, the process proceeds to step S207.

[0046] In step S207, the strain measurement unit 16 continuously measures the amount of strain generated inside the concrete 2.

[0047] In step S208, the potential control unit 14' determines whether the amount of strain falls within a third threshold. If the amount of strain is within the third threshold, the process returns to step S207. If the amount of strain exceeds the third threshold, the potential control is terminated.

[0048] According to the peeling device 1' of this embodiment, even when it is anticipated that detecting abnormal values ​​(current values ​​that deviate from the judgment criterion interval between the first threshold and the second threshold) will be difficult, it will be possible to confirm the peeling of concrete 2 by measuring the amount of strain.

[0049] To operate the above-described peeling devices 1 and 1', it is also possible to use a computer capable of executing program instructions. Figure 7 is a block diagram illustrating the schematic configuration of a computer functioning as peeling devices 1 and 1'. Here, the computer functioning as peeling devices 1 and 1' may be a general-purpose computer, a dedicated computer, a workstation, a PC (Personal Computer), an electronic notepad, etc. Program instructions may be program code, code segments, etc., for executing the required tasks.

[0050] As shown in Figure 7, the computer 100 comprises a processor 110, a memory unit consisting of a ROM (Read Only Memory) 120, a RAM (Random Access Memory) 130, and a storage unit 140, an input unit 150, an output unit 160, and a communication interface (I / F) 170. Each component is connected to the others via a bus 180 so as to be able to communicate with each other.

[0051] ROM 120 stores various programs and data. RAM 130 temporarily stores programs or data as a working area. Storage 140 consists of an HDD (Hard Disk Drive) or SSD (Solid State Drive) and stores various programs and data, including the operating system. In this disclosure, the program related to this disclosure is stored in either ROM 120 or storage 140.

[0052] The processor 110 is specifically a CPU (Central Processing Unit), MPU (Micro Processing Unit), GPU (Graphics Processing Unit), DSP (Digital Signal Processor), SoC (System on a Chip), etc., and may be composed of multiple processors of the same or different types. The processor 110 reads a program from the ROM 120 or storage 140 and executes the program using the RAM 130 as a working area, thereby controlling each of the above configurations and performing various calculations. At least a part of these processes may be implemented in hardware.

[0053] The program may be recorded on a recording medium readable by the peeling devices 1 and 1'. Using such a recording medium, it can be installed on the peeling devices 1 and 1'. The recording medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, but may include, for example, a CD-ROM, DVD-ROM, or USB (Universal Serial Bus) memory. Furthermore, this program may be downloaded from an external device via a network.

[0054] The following additional information is disclosed regarding the embodiments described above.

[0055] (Additional note 1) A peeling device that assists in the repair of concrete structures containing reinforcing bars, An electrolyte sheet that is attached to the concrete surface, A first electrode connected to the electrolyte sheet, A second electrode connected to the exposed rebar, A peeling apparatus comprising: a controller that applies a voltage to the second electrode using the first electrode as a reference electrode, controls the potential so that the potential generated at the second electrode falls within a predetermined range, and continuously measures the current value of the current flowing from the second electrode to the first electrode. (Additional note 2) The peeling apparatus according to Appendix 1, wherein the potential within the predetermined range is such that the potential generated at the second electrode is in the range of -0.5V to +0.35V vs. SHE. (Additional note 3) The peeling device according to Appendix 1 or 2, wherein the electrolyte sheet is obtained by gelling an aqueous solution containing an electrolyte with a gelling agent. (Additional note 4) The electrolyte is copper sulfate or potassium chloride. The stripping apparatus according to Appendix 3, wherein the reference electrode of the first electrode is made of copper when the electrolyte is copper sulfate, and silver when the electrolyte is potassium chloride. (Additional note 5) The delamination device according to any one of the appendices 1 to 4, wherein the controller determines whether the delamination of the concrete is confirmed by whether the current value measured by the current measuring unit falls within a judgment criterion interval from a first threshold to a second threshold, and if the current value is within the judgment criterion interval, the current measurement is continued, and if the current value deviates from the judgment criterion interval, the potential control is terminated. (Additional note 6) The peeling device according to any one of the appendices 1 to 5, wherein the controller continuously measures the amount of strain generated inside the concrete using a strain gauge installed near the electrolyte sheet, determines whether the amount of strain falls within a third threshold, continues measuring the amount of strain if the amount of strain is within the third threshold, and terminates the potential control if the amount of strain exceeds the third threshold. (Additional note 7) A peeling method that assists in the repair of concrete structures containing reinforcing bars, Using a peeling device, A concrete delamination method comprising: using a first electrode as a reference electrode; applying a voltage to a second electrode; controlling the potential so that the potential generated at the second electrode falls within a predetermined range; continuously measuring the current value of the current flowing from the second electrode to the first electrode; and determining whether concrete delamination has occurred based on whether the measured current value falls within a judgment criterion interval from a first threshold to a second threshold. (Additional note 8) A non-temporary storage medium storing a program executable by a computer, the non-temporary storage medium storing a program that causes the computer to function as a peeling device as described in any one of the appendices 1 to 6.

[0056] Although the embodiments described above are representative examples, it will be apparent to those skilled in the art that many modifications and substitutions are possible within the spirit and scope of this disclosure. Therefore, the present invention should not be construed as being limited by the embodiments described above, and various modifications or changes are possible without departing from the claims. For example, it is possible to combine multiple component blocks shown in the configuration diagram of the embodiments into one, or to divide one component block. [Explanation of Symbols]

[0057] 1,1' Peeling device 2 Concrete 3 Reinforcement bars 11 Electrolyte Sheet 12 First electrode 12A reference electrode 12B Opposite pole 13. Second electrode (working electrode) 14 Potential control unit (potentiostat) 15 Current value measurement section 16. Strain measurement section 16A Strain Gauge 20,20′ Control arithmetic circuit (controller) 100 Computers 110 processors 120 ROM 130 RAM 140 storage 150 Input section 160 Output section 170 Communication Interface (I / F) 180 bus

Claims

1. A peeling device that assists in the repair of concrete structures containing reinforcing bars, An electrolyte sheet that is attached to the concrete surface, A first electrode connected to the electrolyte sheet, A second electrode connected to the exposed reinforcing bar, A potential control unit that uses the first electrode as a reference electrode, applies a voltage to the second electrode, and controls the potential so that the potential generated at the second electrode falls within a predetermined range, A current measuring unit that continuously measures the current value of the current flowing from the second electrode to the first electrode, A peeling device equipped with the following features.

2. The peeling apparatus according to claim 1, wherein the potential within the predetermined range is such that the potential generated at the second electrode is -0.5V to +0.35V vs. SHE.

3. The peeling apparatus according to claim 1 or 2, wherein the electrolyte sheet is obtained by gelling an aqueous solution containing an electrolyte with a gelling agent.

4. The electrolyte is copper sulfate or potassium chloride. The stripping apparatus according to claim 3, wherein the reference electrode of the first electrode is made of copper when the electrolyte is copper sulfate, and silver when the electrolyte is potassium chloride.

5. The peeling device according to claim 1 or 2, wherein the potential control unit determines whether the concrete has peeled off based on whether the current value measured by the current measuring unit falls within a judgment criterion interval from a first threshold to a second threshold, and if the current value is within the judgment criterion interval, it continues current measurement, and if the current value deviates from the judgment criterion interval, it terminates the potential control.

6. The system further includes a strain measurement unit that continuously measures the amount of strain generated inside the concrete using a strain gauge installed near the electrolyte sheet. The peeling apparatus according to claim 1 or 2, wherein the potential control unit further determines whether the amount of strain falls within a third threshold, continues measuring the amount of strain if the amount of strain is within the third threshold, and terminates the potential control when the amount of strain exceeds the third threshold.

7. A peeling method that assists in the repair of concrete structures containing reinforcing bars, Using a peeling device, The first electrode is used as a reference electrode, a voltage is applied to the second electrode, and the potential is controlled so that the potential generated at the second electrode falls within a predetermined range. The steps include continuously measuring the current value of the current flowing from the second electrode to the first electrode, The step of confirming concrete spalling is to determine whether the measured current value falls within a judgment criterion interval from a first threshold to a second threshold, A peeling method that performs this procedure.

8. A program for causing a computer to function as a peeling device according to claim 1 or 2.

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