JP6821986B2 - Concrete building inspection method - Google Patents

Description

The present invention relates to a method for inspecting a concrete building.

In order to safely maintain and manage concrete structures and extend their life, it is necessary to accurately grasp the internal quality of concrete structures and take appropriate measures.

In recent years, regarding the inspection method of concrete buildings, a technique of attaching a sensor to a reinforcing bar previously arranged in a concrete building at the time of construction (Patent Document 1) and a technique of inserting a sensor into uncured concrete and placing it. (Patent Document 2) is disclosed. All of these are based on the premise that the sensor is embedded when constructing a concrete building.

On the other hand, for existing concrete structures in which sensors are not embedded at the time of construction, destructive inspection is widely performed in which a sample is cut out from the concrete structure to be inspected and analyzed.

However, in the above-mentioned destructive inspection, it is necessary to perform each work of cutting out the sample and analyzing the sample, which causes a problem that it takes time and effort. In particular, when it is desired to track the change over time in the internal quality of an existing concrete building, it is necessary to repeatedly cut out samples and analyze them, which becomes a problem that it takes time and effort.

As a non-destructive inspection method in which a sample is not cut out, a method of attaching a mortar panel to a concrete structure and collecting it after a certain period of time for analysis has also been proposed (Non-Patent Document 1).

However, even in the above non-destructive inspection, it is necessary to collect and analyze the panel attached to the concrete structure at predetermined intervals, and there is a problem that it takes time and effort as in the destructive inspection. Also, as with the above destructive inspection, if you want to track the changes in the internal quality of an existing concrete building over time, it is necessary to repeatedly collect the panels and analyze them, which is a problem that it takes time and effort. Become.

Japanese Unexamined Patent Publication No. 2006-348538 JP-A-2007-33238

Tatsuhiko Saeki, Yosuke Nose, Michio Kikuchi: Basic study on micro-salt damage environment evaluation method using thin mortar specimen, Annual Proceedings of Concrete Engineering, Vol.33, No.1, 2011

The present invention has been made in view of such circumstances, and an object of the present invention is to solve the above-mentioned problems of the prior art, and to sample an existing concrete building in which a sensor is not embedded at the time of construction. It is to provide an inspection method of a concrete structure capable of inspecting the internal quality without the trouble of cutting out or collecting panels and analyzing them.

As a result of diligent studies in order to solve the above problems, the present inventors have conducted monitoring to detect the state of the concrete structure in the inspection holes formed on the wall surface of the concrete structure as a method for inspecting the concrete structure. We have found that the above problem can be solved by adopting a configuration having a sensor insertion step of inserting a concrete for concrete and an information reading step of reading the information of the sensor with the sensor inserted in the inspection hole. The invention was completed. The present invention provides the following [1] to [11].
[1] A sensor insertion step of inserting a monitoring sensor for detecting the state of a concrete structure into an inspection hole formed on the wall surface of the concrete structure, and sensor information with the sensor inserted into the inspection hole. Information to be read A concrete structure inspection method having a reading process.
[2] As the sensor, an RFID tag having an antenna circuit and an IC chip mounted on a base material and a memory information of the IC chip are changed in response to a specific stimulus affecting the characteristics of a concrete structure. The concrete structure inspection method according to [1], which uses a sensor having a stimulus response site.
[3] The concrete structure inspection method according to [2], wherein the sensor includes a tamper detection circuit connected to the RFID tag, and the stimulus response site is provided in the tamper detection circuit.
[4] Described in any one of [1] to [3], which comprises an inspection hole forming step of forming a drill hole having a hole diameter of 2 mmφ to 220 mmφ on the wall surface of the concrete structure as an inspection hole prior to the sensor insertion step. Concrete structure inspection method.
[5] Any of [2] to [4] having a sensor position adjusting step of guiding at least a part of the stimulus response portion inserted into the inspection hole to a position in contact with the inner surface of the inspection hole after the sensor insertion step. The concrete structure inspection method described in.
[6] A flexible sheet-shaped sensor is used as the sensor, and in the sensor insertion step, the sheet-shaped sensor is rolled into a tubular shape, the sensor is inserted, and the sensor position adjusting step is performed. Then, the concrete structure inspection method according to [5], wherein the sensor is guided to the position by the shape recovery force of the base material.
[7] The concrete structure inspection method according to [5], wherein in the sensor position adjusting step, a filler is filled in the inner circumference of the sensor in the inspection hole to guide the sensor to the position.
[8] The concrete structure inspection method according to [7], wherein a filler having a curing shrinkage of 1% or less is used as the filler.
[9] The concrete structure inspection method according to [5], wherein in the sensor position adjusting step, a foamed resin is foamed on the inner circumference of the sensor in the inspection hole to guide the sensor to the position.
[10] A two-component mixed foamed polyurethane resin is used as the foamed resin, and the main component and the curing agent component of the two-component mixed foamed polyurethane resin are inserted into the spaces partitioned by the encapsulating film, and then the encapsulating film is used. The concrete structure inspection method according to [9], wherein the material is drawn out, mixed, and expanded 2 to 100 times.
[11]
The concrete structure inspection method according to any one of [5] to [8], which comprises a closing step of closing the inspection hole after the sensor position adjusting step.

According to the present invention having the above configuration, even for an existing concrete building in which a sensor is not embedded at the time of construction, the internal quality can be improved without the trouble of cutting out a sample, collecting panels, and analyzing them. It is possible to realize an inspection method for concrete buildings that can be inspected.
In addition, when it is desired to track the change over time in the internal quality of an existing concrete structure, it is necessary to cut out a sample at predetermined intervals in the above destructive inspection, and the concrete structure is obtained by repeatedly cutting out the sample. However, according to the present invention, it is not necessary to cut out a sample for each inspection, and damage to the concrete structure can be avoided.
In addition, in the case of the above non-destructive inspection, the data obtained by the panel analysis is the analysis data about the panel attached to the surface of the concrete building, and the information about the internal quality of the concrete building is the analysis data of this panel. In contrast to the information obtained indirectly through arithmetic processing using a predetermined function, according to the present invention, information on the internal quality of a concrete building is obtained via a sensor inserted inside the concrete building. It can be obtained directly.

It is a schematic diagram of a sheet-shaped sensor. It is a block diagram which shows the circuit configuration example of a monitoring tag and a reading terminal. It is a schematic diagram of the circuit configuration in a sensor.

Hereinafter, the concrete building inspection method according to the embodiment of the present invention will be described in detail.

(Sensor insertion process)
In the sensor insertion step, a monitoring sensor for detecting the state of the concrete structure is inserted into the inspection hole formed on the wall surface of the concrete structure. The inspection hole may be formed when the sensor is inserted, or may be an existing hole formed on the wall surface for other purposes.

In order to avoid a decrease in strength of the concrete structure due to the formation of the inspection hole, the inspection hole preferably has a hole diameter of 2 mmφ to 220 mmφ, more preferably 8 mmφ to 180 mmφ, and further preferably 10 mmφ to 100 mmφ.
For the formation of the inspection hole, for example, a cemented carbide drill, a diamond core drill, or the like having an optimum diameter can be used.

In order to more accurately detect the condition of the concrete structure, it is preferable that the sensor is arranged in the inspection hole in contact with the inner wall.

In this embodiment, a flexible sheet-shaped sensor 1 is used as the sensor.
As shown in FIGS. 1 and 2, the sensor 1 is composed of an antenna unit 2 and a sensor unit 3, and is used by rolling the sensor unit 3 into a tubular shape and inserting it into an inspection hole.

As shown in FIG. 2, the antenna unit 2 includes an RFID tag 5 and a transmission / reception antenna 10. In the present embodiment, the RFID tag 5 and the transmission / reception antenna 10 are sealed with a sealing material to form the antenna portion 2.
As shown in FIG. 2, the transmitting / receiving antenna 10 is connected to the IC chip 7 of the RFID tag 5 to form an antenna circuit 6 that communicates with a reader / writer or the like.
As shown in FIG. 2, the sensor unit 3 includes a loop circuit 11 connected to the IC chip 7 of the RFID tag 5 and a stimulus response portion 12 described later. In the present embodiment, the loop circuit 11 and the stimulus response portion 12 described later are sealed with a sealing material to form the sensor unit 3.
The encapsulant is composed of a group consisting of polyethylene resin, polypropylene resin, polystyrene resin, polyvinyl chloride resin, acrylic resin, polycarbonate resin, polytetrafluoroethylene resin, polyurethane resin, epoxy resin, silicone resin, and EVA resin. It is preferable to use at least one of them.
It is preferable to further laminate a cover film after sealing with a sealing material.
The cover film is preferably selected as appropriate according to the environment in which the sensor is installed, and is composed of a group consisting of a polyethylene film, a polypropylene film, a vinyl chloride film, a polystyrene film, and a polyethylene terephthalate (PET) film. It is preferable to use at least one of them.
The cover film has weather resistance (moisture resistance, heat resistance, salt damage resistance, etc.), water vapor barrier property, electrical insulation, mechanical properties (tensile strength, elongation, tear strength, etc.), chemical resistance, adhesion to the sealing material, etc. It is also possible to have a structure in which films (PVF, PET, etc.) having various performances are laminated according to the above requirements.

<Antenna part>
The RFID tag 5 is a radio frequency tag in which solid-state identification information (Identification) is embedded in a built-in IC chip 7. In the embodiment shown in FIG. 2, the RFID tag 5 having a built-in antenna in the IC chip 7 is shown, but the configuration of the RFID tag 5 is not limited to this embodiment, and for example, the built-in antenna is provided in the IC chip. It is also possible to use a type that is not provided.
The transmission / reception antenna 10 has a function of receiving radio waves transmitted from a reader / writer and a function of transmitting memory information in the IC chip 7 to the reader / writer via the built-in circuit of the IC chip 7.

The RFID tag 5 used in this embodiment is a passive type RFID tag that does not incorporate a battery.
The shape of the RFID tag 5 can be selected from a label type, a card type, a coin type, a stick type, and the like, depending on the intended use. The communication distance of the RFID tag can be selected from several mm to several m, depending on the application.

The IC chip 7 is, for example, a small semiconductor chip having a size of 0.4 mm to 1 mm square.
The IC chip 7 is equipped with a simple microcomputer, EEPROM, RAM, etc., and has a memory function as a medium for storing a specific ID or the like. It is also possible to provide a program for performing encryption processing to prevent data tampering.

The transmitting / receiving antenna 10 is preferably located on or near the surface of the concrete building from the viewpoint of the communication distance with the reader / writer or the like.

<Sensor section>
In the present embodiment, the sensor unit 3 is temporarily fixed in a tubular shape and inserted into the inspection hole.
As shown in FIG. 1, it is preferable that a resin rod member is adhered to the side end of the sensor unit 3 as a core 4 used when the sensor unit 3 is wound and rolled into a tubular shape. The rod member is at least one of acrylic resin, epoxy resin, silicone resin, polyethylene resin, polypropylene resin, polystyrene resin, polyvinyl chloride resin, polycarbonate resin, polytetrafluoroethylene resin, polyurethane resin, and EVA resin. Is preferable.
It is preferable that the sensor unit 3 is inserted into the inspection hole so that the core 4 after insertion is parallel to the central axis of the inspection hole. Specifically, when the inspection hole is formed substantially perpendicular to the wall surface, the sensor unit 3 is inserted while holding the core 4 substantially perpendicular to the wall surface of the concrete structure for inspection. When the hole is formed at a predetermined angle with respect to the wall surface, it is preferable to insert the sensor unit 3 while holding the core 4 so as to have the predetermined angle with respect to the wall surface. .. When the temporarily fixed state is released after the insertion, the sensor portion is arranged at a position along the inner wall in the inspection hole by the shape recovery force of the flexible sensor portion.
The core 4 can also be used as the sensor unit 3. Specifically, for example, the core 4 may be made of a silicone tube, and the loop circuit 11 may be directly formed on the silicone tube.

The loop circuit 11 is a tamper detection circuit laid for the purpose of detecting the occurrence of a tamper due to the cleavage of the circuit.

Normally, the tamper detection circuit is provided so that if the RFID tag is intentionally peeled off (for the purpose of theft or the like) from the object to which the RFID tag is attached, it will be mechanically destroyed. A circuit, that is, a circuit laid for the purpose of detecting an action (that is, a tamper action) that caused the circuit by cleaving the circuit. In this specification, a tamper detection circuit is used. When an RFID-tagged concrete structure is exposed to a specific stimulus that affects its properties, the physical or chemical reaction resulting from that stimulus causes it to cleave or change its resistance. Circuits provided as such (ie, laid for the purpose of detecting that RFID-tagged concrete structures have been exposed to the specific stimuli that contributed to them due to circuit cleavage or changes in resistance. The circuit) is also included.

The loop circuit 11, which is a tamper detection circuit, includes a stimulus response site 12 that causes the above-mentioned physical or chemical reaction.
As used herein, a stimulus-responsive site is a function that "responds" to a concrete structure when exposed to a particular stimulus that affects its properties, specifically a physical reaction that cleaves a circuit. It means a part having a function of changing a memory information to an IC chip by causing a chemical reaction or a physical reaction or a chemical reaction that changes the resistance of a circuit, that is, a sensor function for detecting a change in the external environment. To do.

Both ends of the loop circuit 11 are wiredly connected to predetermined pins of the IC chip 75 in the RFID tag 52. As the IC chip 7, it is preferable to use one that can distinguish and detect the high and low resistance states of the loop circuit 11 (for example, UCODE G2iL + manufactured by NXP Semiconductors).

The loop circuit 11 may be connected as a loop that can be energized, and the shape is not particularly limited. It can be appropriately designed into an optimum shape such as a flat surface, a curved surface, or a rod shape according to the usage environment and the purpose of use. Similarly, the size of the loop circuit 11 can be appropriately adjusted to the optimum size.

According to the present invention in which the stimulus response portion 12 is provided in the loop circuit 11, the stimulus response portion 12 can be arranged at a desired position by freely wiring the loop circuit 11, so that the transmission / reception antenna 10 is a concrete structure. It is possible to monitor a desired location with high accuracy while maintaining a communication distance with a reader / writer or the like by arranging the surface or the vicinity of the surface.

In order to avoid noise due to interference between the loop circuit 11 and the antenna circuit 6, the communication wavelength is λ, and the distance between the start positions of the loop circuit 11 and the antenna circuit 6 (distance shown as L in FIG. 3). However, it is preferable that L ≧ λ / 256.

When the stimulus response site 12 cleaves the loop circuit 11 or the resistance of the loop circuit 11 changes in response to a specific stimulus as described above, the memory information in the IC chip 7 changes.
For example, when the loop circuit 11 is cleaved or the resistance is changed to become a high resistance state, the "flag" of the predetermined address of the memory is changed from OFF to ON or from ON to OFF. By reading the above with a reader / writer or the like, it is possible to construct a system for detecting that the concrete structure to which the RFID tag 5 is attached is exposed to a specific stimulus.
As shown in FIGS. 2 and 3, the sensor 1 used in the present embodiment has two circuits, a loop circuit 11 and an antenna circuit 6, connected to the IC chip 7, respectively.
As shown in FIG. 1, the stimulus response portion 12 of the loop circuit 11 is arranged in the sensor unit 3, the antenna circuit 6 is arranged in the antenna portion 2, and the stimulus response portion 12 provided in the loop circuit 11 responds to a specific stimulus. Since the loop circuit 11 is cleaved or the resistance of the loop circuit 11 is changed in the memory information in the IC chip 7, a compact sensor having a simple circuit configuration can be obtained.
For example, as a configuration of the sensor unit, a plurality of stimulus response sites are connected in parallel to form a parallel circuit, resistors are arranged in series with each stimulus response site, and the corroded site is based on a change in the combined resistance value. When adopting a configuration that requires some kind of arithmetic processing such as specifying, it is necessary to provide a computer chip in the RFID tag that arithmetically processes the information detected by the sensor unit and uses it as a measured value. Since a terminal for connecting the computer chip to the computer chip is also required, the RFID tag has to be enlarged and power for arithmetic processing is also required. However, as described above, the loop circuit 11 connected to the IC chip 7 has. By providing the stimulus response portion 12, the above-mentioned computer chip is not required, and the terminal for connecting the sensor to the computer chip is also unnecessary. The structure is power-saving, compact and simple, and the degree of freedom of arrangement is increased. You can build a high-end system.

As described above, the sensor unit 3 is configured by sealing the loop circuit 11 with a sealing material, but as shown in FIG. 1, at least a part of the stimulus response portion 12 is exposed from the sealing material. ing.

The stimulus response site 12 is provided in at least one of the RFID tag 5 or the antenna circuit 6, and when the stimulus response site 12 responds to the stimulus, a disconnection or a short circuit occurs at the installation location of the stimulus response site 12, and the stimulus response site 12 is provided. As a result, it is possible to construct a system for detecting that a concrete building has been exposed to a specific stimulus by using the sensor not responding to a reader / writer or the like as an index.
However, in this case, it is distinguished whether the cause of the lack of response to the reader / writer or the like is due to the stimulus response site 12 responding to the stimulus or due to the damage of the sensor. Can not do it.
Therefore, for accurate judgment, for example, when a plurality of sensors are used and all the sensors do not respond to the reader / writer or the like, the stimulus response site 12 responds to the stimulus. If it is determined that only one of the sensors does not respond to the reader / writer or the like, it is necessary to determine that the sensor has failed.

On the other hand, when the loop circuit 11 is provided with the stimulus response portion 12, the RFID tag 5 itself and the antenna circuit 6 are not affected even when the stimulus response portion 12 responds to the stimulus, and the sensor and the reader / writer or the like are not affected. Since the communication is performed, it is possible to distinguish between the state in which the stimulus response portion 12 responds to the stimulus and the failure of the sensor 1 regardless of the above means.

The structure of the stimulus response site 12 is not particularly limited, but for example, at least a part of the loop circuit 11 can be coated with a stimulus responsive resin. Alternatively, at least a part of the loop circuit 11 can be replaced with an stimulating responsive metal. The entire loop circuit 11 may be coated with the stimulant responsive resin, or the entire loop circuit 11 may be composed of the stimulant responsive metal.
The above-mentioned stimulant-responsive resin and stimulant-responsive metal can be appropriately selected according to the stimulus to be detected.

Specifically, examples of the stimulant-responsive resin include a thermosetting resin material, a pH-responsive resin material, a stress-responsive resin material, a photoresponsive resin material, a resin material that responds to a specific substance, and these. Examples of resin materials and the like in which a plurality are combined can be exemplified.

Examples of the stimulant-responsive metal include a metal that is altered (corroded or the like) by a stimulus to be detected and breaks, or a metal that becomes a non-conductor.
Further, the thickness or width of a part of the metal forming the loop circuit 11 can be changed to improve the stimulus responsiveness to obtain the stimulant responsive metal.
Specifically, it is preferably at least one selected from the group consisting of zinc, aluminum, cadmium, iron, tin, lead, copper, nickel, silver, titanium and zirconium. When monitoring the corrosive environment of reinforcing bars in concrete, it is preferable that at least one selected from the group consisting of aluminum, iron and copper.

The mode in which the stimulus response site 12 changes the memory information of the IC chip 7 in response to a specific stimulus is also not particularly limited. For example, when the stimulus response site 12 responds to a specific stimulus, the loop circuit 11 in the stimulus response site 12 The memory information of the IC chip 7 can be changed by causing a physical reaction or a chemical reaction that cleaves the circuit, or a physical reaction or a chemical reaction that changes the resistance of the loop circuit 11.

From the viewpoint of detection accuracy, it is preferable that the stimulus response site 12 can be freely arranged at any position without being limited to the surface or the vicinity of the surface layer of the concrete building.

(Sensor position adjustment process)
The sensor position adjusting step is a step of guiding at least a part of the stimulus response portion 12 of the sensor 1 inserted into the inspection hole to a position in contact with the inner surface of the inspection hole after the sensor insertion step.

In the present embodiment, as a sensor, a flexible sheet-shaped sensor 1 is rolled into a tubular shape and inserted into an inspection hole, and then the shape recovery force of the flexible sheet-shaped sensor causes a stimulus response site 12 Lead to a position where at least a part of is in contact with the inner surface of the inspection hole.
In the present embodiment, as described above, since the hole diameter of the inspection hole is suppressed to 2 mmφ to 220 mmφ, the flexible sensor portion 3 is temporarily fixed in a tubular shape and inserted into the inspection hole. By releasing the temporary fixation after this, at least a part of the sensor inserted into the inspection hole, preferably the stimulus response site 12, can be easily guided to a position in contact with the inner surface of the inspection hole.

In addition, a position where at least a part of the stimulus response portion 12 of the sensor inserted into the inspection hole is in contact with the inner surface of the inspection hole by filling the space generated on the inner peripheral side of the sensor 1 inserted into the inspection hole with a filler. Can also lead to.
As the filler, it is preferable to use a filler having a curing shrinkage of 1% or less. Specifically, cement, mortar, concrete, epoxy resin, fluororesin, polypropylene, vinyl ethylene acetate, PET, PEEK, ABS resin, etc. It is preferably at least one selected from the group consisting of polystyrene, polycarbonate, vinyl chloride and PMMA.

In addition, in the space generated on the inner peripheral side of the sensor 1 inserted into the inspection hole, the foamable resin is foamed or the expandable member is expanded to expand the stimulus response portion 12 of the sensor inserted into the inspection hole. At least a part of the test hole can be guided to a position where it contacts the inner surface of the inspection hole.

For example, a cylindrical perforated pipe (material: urethane, silicone, PP, PC, PE, vinyl chloride, etc., thickness: 0.2 mm or more, outer shape: φ8 mm to φ10 mm, center hole: 1/4 or less of the outer shape). Therefore, two spaces partitioned by an encapsulating film are formed in the central pores thereof, and two liquids of a polyol component and an isocyanate component are enclosed in each space.
After arranging the perforated pipe in the space generated on the inner peripheral side of the sensor 1 inserted in the inspection hole, the encapsulating film can be pulled out and the above two liquids can be mixed and foamed.

Further, for example, a cylindrical urethane foam (cell number of 0.1 mm or more) in which an isocyanate component is sealed in a central hole portion via an sealing film can be used.
After arranging this urethane foam in the space generated on the inner peripheral side of the sensor 1 inserted in the inspection hole, the encapsulating film is pulled out, and the urethane foam resin constituting the urethane foam is reacted with the isocyanate component to foam it. Can be done.

In addition, when the core 4 is used as the sensor unit 3 (for example, when the core 4 is composed of a silicone tube and the loop circuit 11 is directly formed on the silicone tube), the loop circuit 11 is formed on the silicone tube. It is also possible to make a notch in a place not provided, insert the core 4 into the inspection hole, and then inflate and divide the core 4 from the notch to guide at least a part of the stimulus response site 12 to a position in contact with the inner surface of the inspection hole.

(Stopping process)
The blocking step is a step of closing the inspection hole after the sensor position adjusting step.
The detection accuracy of the sensor 1 can be improved by inserting the sensor 1 into the inspection hole, adjusting the position, and then closing the inspection hole with a cap or the like.
For example, as the cap, a cap made of ceramics or polycarbonate with a double-sided strong adhesive attached can be used. It is preferable to provide a release film on one side of the double-sided strong adhesive. In this case, the cap can be easily attached by simply peeling off the release film.

It is also possible to insert only the sensor portion 3 into the inspection hole, close it with a cap, and then attach the antenna portion 2 on the cap. In this case, it is preferable to attach a double-sided strong adhesive to the back surface of the antenna portion 2 in advance. It is preferable to provide a release film on one side of the double-sided strong adhesive. In this case, the antenna portion 2 can be easily attached by simply peeling off the release film.

(Information reading process)
The memory information of the IC chip 7 can be read by using a reader / writer or the like.
By performing this reading every time a predetermined date and time elapses, it is possible to easily track the change over time in the internal quality of the concrete building in a non-destructive manner without complicated work such as analysis.
Specifically, for example, by setting the stimulus response site to respond to the hydrogen ion index (pH), the progress of neutralization in the reinforced concrete structure can be detected nondestructively in a short time. By setting the stimulus response site to respond to the chlorine ion concentration, which is a deterioration factor of the reinforced concrete structure, the progress of salt damage in the reinforced concrete structure can be detected nondestructively in a short time.

From the above memory information, "a state in which the stimulus response site responds to a predetermined stimulus or a tampering action is performed", "a stimulus response site does not respond to a predetermined stimulus, and a tampering action is also performed". It can be determined that the state is either "no normal state" or "sensor failure state".

1 Sensor 2 Antenna part 3 Sensor part 4 Core 5 RFID tag 6 Antenna circuit 7 IC chip 10 Transmission / reception antenna 11 Loop circuit 12 Stimulation response part

Claims (8)

A sensor insertion process that inserts a monitoring sensor that detects the state of the concrete structure into the inspection hole formed on the wall surface of the concrete structure, and information reading that reads the sensor information with the sensor inserted in the inspection hole. We have a process,
As the sensor, an RFID tag on which an antenna circuit and an IC chip are mounted on a base material, and a stimulus response portion that changes the memory information of the IC chip in response to a specific stimulus that affects the characteristics of a concrete structure. Using a flexible sheet-shaped sensor
After the sensor insertion step, there is a sensor position adjusting step of guiding at least a part of the stimulus response site inserted into the inspection hole to a position in contact with the inner surface of the inspection hole.
In the sensor insertion step, the sheet-shaped sensor is rolled into a tubular shape, and the sensor is inserted.
In the sensor position adjusting step, a concrete structure inspection method in which the sensor is guided to the position by the shape recovery force of the base material . The concrete structure inspection method according to claim 1 , wherein the sensor includes a tamper detection circuit connected to the RFID tag, and the stimulus response site is provided in the tamper detection circuit. The concrete structure inspection method according to claim 1 or 2 , further comprising an inspection hole forming step of forming a drill hole having a hole diameter of 2 mmφ to 220 mmφ on the wall surface of the concrete structure as an inspection hole prior to the sensor insertion step. The concrete structure inspection method according to any one of claims 1 to 3, wherein in the sensor position adjusting step, a filler is filled in the inner circumference of the sensor in the inspection hole to guide the sensor to the position. .. Wherein as filler, curing shrinkage using 1% or less of the filler, the concrete structure inspection method according to claim 4. The concrete structure inspection according to any one of claims 1 to 3, wherein in the sensor position adjusting step, a foamed resin is foamed on the inner circumference of the sensor in the inspection hole to guide the sensor to the position. Method. A two-component mixed foamed polyurethane resin is used as the foamed resin, and the main component and the curing agent component of the two-component mixed foamed polyurethane resin are inserted into the spaces partitioned by the encapsulating film, and then the encapsulating film is pulled out. The method for inspecting a concrete structure according to claim 6 , wherein the mixture is mixed and expanded 2 to 100 times. The concrete structure inspection method according to any one of claims 1 to 7 , further comprising a closing step of closing the inspection hole after the sensor position adjusting step.